/* ============================================================
   TrigMaster SA — standalone stylesheet
   Replicates the original Tailwind-based appearance using
   plain CSS utilities + semantic component classes.
   ============================================================ */

:root {
  --c-app: #0F172A;
  --c-card: #1E293B;
  --c-panel: #334155;
  --c-panel2: #475569;
  --c-blue: #3B82F6;
  --c-blue-dark: #1D4ED8;
  --c-blue-deep: #2563EB;
  --c-green: #10B981;
  --c-green-dark: #047857;
  --c-green-deep: #059669;
  --c-red: #F43F5E;
  --c-red-dark: #9F1239;
  --c-red-deep: #881337;
  --c-red-bright: #E11D48;
  --c-rose: #EF4444;
  --c-rose-dark: #DC2626;
  --c-rose-deep: #B91C1C;
  --c-amber: #F59E0B;
  --c-amber-dark: #B45309;
  --c-yellow: #FDE047;
  --c-yellow-dark: #CA8A04;
  --c-yellow-text: #854D0E;
  --c-sky: #38BDF8;
  --c-slate-100: #F1F5F9;
  --c-slate-200: #E2E8F0;
  --c-slate-300: #CBD5E1;
  --c-slate-400: #94A3B8;
  --c-slate-500: #64748B;
  --c-slate-600: #475569;
  --c-slate-700: #334155;
  --c-slate-800: #1E293B;
  --c-slate-900: #0F172A;
  --c-slate-950: #020617;
  --c-success-bg: #ECFDF5;
  --c-error-bg: #FFF1F2;
  --c-green-text: #065F46;
  --c-red-text: #9F1239;
  --c-white: #FFFFFF;
  --c-indigo: #6366F1;
  --c-emerald: #34D399;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--c-app);
  color: var(--c-white);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
button:disabled { cursor: not-allowed; }
input, select { font-family: inherit; }
a { color: inherit; text-decoration: none; }

/* ---------- Base utility: colors ---------- */
.bg-app { background: var(--c-app); }
.bg-card { background: var(--c-card); }
.bg-panel { background: var(--c-panel); }
.bg-panel2 { background: var(--c-panel2); }
.bg-blue { background: var(--c-blue); }
.bg-blue-dark { background: var(--c-blue-dark); }
.bg-blue-deep { background: var(--c-blue-deep); }
.bg-green { background: var(--c-green); }
.bg-green-dark { background: var(--c-green-dark); }
.bg-green-deep { background: var(--c-green-deep); }
.bg-red { background: var(--c-red); }
.bg-red-dark { background: var(--c-red-dark); }
.bg-red-deep { background: var(--c-red-deep); }
.bg-red-bright { background: var(--c-red-bright); }
.bg-rose { background: var(--c-rose); }
.bg-rose-dark { background: var(--c-rose-dark); }
.bg-amber { background: var(--c-amber); }
.bg-amber-dark { background: var(--c-amber-dark); }
.bg-yellow { background: var(--c-yellow); }
.bg-yellow-dark { background: var(--c-yellow-dark); }
.bg-sky { background: var(--c-sky); }
.bg-slate-100 { background: var(--c-slate-100); }
.bg-slate-200 { background: var(--c-slate-200); }
.bg-slate-300 { background: var(--c-slate-300); }
.bg-slate-500 { background: var(--c-slate-500); }
.bg-slate-600 { background: var(--c-slate-600); }
.bg-slate-700 { background: var(--c-slate-700); }
.bg-slate-800 { background: var(--c-slate-800); }
.bg-slate-900 { background: var(--c-slate-900); }
.bg-slate-950 { background: var(--c-slate-950); }
.bg-white { background: var(--c-white); }
.bg-success { background: var(--c-success-bg); }
.bg-error { background: var(--c-error-bg); }

/* opacity-tinted backgrounds */
.bg-red-20 { background: rgba(244, 63, 94, 0.2); }
.bg-red-30 { background: rgba(244, 63, 94, 0.3); }
.bg-green-20 { background: rgba(16, 185, 129, 0.2); }
.bg-green-30 { background: rgba(16, 185, 129, 0.3); }
.bg-green-40 { background: rgba(16, 185, 129, 0.4); }
.bg-blue-20 { background: rgba(59, 130, 246, 0.2); }
.bg-blue-30 { background: rgba(59, 130, 246, 0.3); }
.bg-yellow-30 { background: rgba(253, 224, 71, 0.3); }
.bg-panel-50 { background: rgba(51, 65, 85, 0.5); }
.bg-panel-60 { background: rgba(51, 65, 85, 0.6); }
.bg-rose-20 { background: rgba(239, 68, 68, 0.2); }
.bg-amber-20 { background: rgba(245, 158, 11, 0.2); }
.bg-indigo-20 { background: rgba(99, 102, 241, 0.2); }
.bg-overlay { background: rgba(2, 6, 23, 0.85); }

.text-white { color: var(--c-white); }
.text-slate-100 { color: var(--c-slate-100); }
.text-slate-200 { color: var(--c-slate-200); }
.text-slate-300 { color: var(--c-slate-300); }
.text-slate-400 { color: var(--c-slate-400); }
.text-slate-500 { color: var(--c-slate-500); }
.text-slate-600 { color: var(--c-slate-600); }
.text-slate-700 { color: var(--c-slate-700); }
.text-blue { color: var(--c-blue); }
.text-sky { color: var(--c-sky); }
.text-green { color: var(--c-green); }
.text-red { color: var(--c-red); }
.text-rose { color: var(--c-rose); }
.text-yellow { color: var(--c-yellow); }
.text-amber { color: var(--c-amber); }
.text-green-text { color: var(--c-green-text); }
.text-red-text { color: var(--c-red-text); }
.text-yellow-text { color: var(--c-yellow-text); }

.border-slate-300 { border-color: var(--c-slate-300); }
.border-slate-500 { border-color: var(--c-slate-500); }
.border-slate-600 { border-color: var(--c-slate-600); }
.border-slate-700 { border-color: var(--c-slate-700); }
.border-slate-800 { border-color: var(--c-slate-800); }
.border-blue { border-color: var(--c-blue); }
.border-blue-dark { border-color: var(--c-blue-dark); }
.border-green { border-color: var(--c-green); }
.border-green-dark { border-color: var(--c-green-dark); }
.border-red { border-color: var(--c-red); }
.border-red-dark { border-color: var(--c-red-dark); }
.border-amber { border-color: var(--c-amber); }
.border-amber-dark { border-color: var(--c-amber-dark); }
.border-yellow { border-color: var(--c-yellow); }
.border-yellow-dark { border-color: var(--c-yellow-dark); }
.border-sky { border-color: var(--c-sky); }
.border-rose { border-color: var(--c-rose); }
.border-rose-dark { border-color: var(--c-rose-dark); }
.border-rose-deep { border-color: var(--c-rose-deep); }

/* ---------- Base utility: borders & radii ---------- */
.border { border: 1px solid; }
.border-2 { border: 2px solid; }
.border-3 { border: 3px solid; }
.border-4 { border: 4px solid; }
.border-b-2 { border-bottom: 2px solid; }
.border-b-4 { border-bottom: 4px solid; }
.border-b-6 { border-bottom: 6px solid; }
.border-t-2 { border-top: 2px solid; }
.border-l-4 { border-left: 4px solid; }
.border-dashed { border-style: dashed; }

.rounded { border-radius: 0.25rem; }
.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 0.75rem; }
.rounded-2xl { border-radius: 1rem; }
.rounded-3xl { border-radius: 1.5rem; }
.rounded-full { border-radius: 9999px; }
.rounded-tl-full { border-top-left-radius: 9999px; }
.rounded-tr-full { border-top-right-radius: 9999px; }
.rounded-bl-full { border-bottom-left-radius: 9999px; }
.rounded-br-full { border-bottom-right-radius: 9999px; }

/* ---------- Base utility: layout ---------- */
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1 1 0%; }
.shrink-0 { flex-shrink: 0; }
.grow { flex-grow: 1; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.justify-start { justify-content: flex-start; }
.relative { position: relative; }
.absolute { position: absolute; }
.sticky { position: sticky; }
.top-0 { top: 0; }
.inset-0 { inset: 0; }
.overflow-hidden { overflow: hidden; }
.overflow-x-auto { overflow-x: auto; }
.overflow-y-auto { overflow-y: auto; }
.w-full { width: 100%; }
.h-full { height: 100%; }
.mx-auto { margin-left: auto; margin-right: auto; }
.self-start { align-self: flex-start; }

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.gap-0 { gap: 0; }
.gap-1 { gap: 0.25rem; }
.gap-1\.5 { gap: 0.375rem; }
.gap-2 { gap: 0.5rem; }
.gap-2\.5 { gap: 0.625rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-5 { gap: 1.25rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }

.space-y-2 > * + * { margin-top: 0.5rem; }
.space-y-2\.5 > * + * { margin-top: 0.625rem; }
.space-y-3 > * + * { margin-top: 0.75rem; }
.space-y-4 > * + * { margin-top: 1rem; }
.space-y-6 > * + * { margin-top: 1.5rem; }
.space-y-8 > * + * { margin-top: 2rem; }

/* ---------- Base utility: spacing ---------- */
.p-1 { padding: 0.25rem; }
.p-1\.5 { padding: 0.375rem; }
.p-2 { padding: 0.5rem; }
.p-2\.5 { padding: 0.625rem; }
.p-3 { padding: 0.75rem; }
.p-3\.5 { padding: 0.875rem; }
.p-4 { padding: 1rem; }
.p-5 { padding: 1.25rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }
.p-10 { padding: 2.5rem; }
.px-1 { padding-left: 0.25rem; padding-right: 0.25rem; }
.px-2 { padding-left: 0.5rem; padding-right: 0.5rem; }
.px-2\.5 { padding-left: 0.625rem; padding-right: 0.625rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.px-3\.5 { padding-left: 0.875rem; padding-right: 0.875rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-5 { padding-left: 1.25rem; padding-right: 1.25rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.py-1 { padding-top: 0.25rem; padding-bottom: 0.25rem; }
.py-1\.5 { padding-top: 0.375rem; padding-bottom: 0.375rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-2\.5 { padding-top: 0.625rem; padding-bottom: 0.625rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.py-3\.5 { padding-top: 0.875rem; padding-bottom: 0.875rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-5 { padding-top: 1.25rem; padding-bottom: 1.25rem; }
.py-6 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.pt-1 { padding-top: 0.25rem; }
.pt-2 { padding-top: 0.5rem; }
.pt-3 { padding-top: 0.75rem; }
.pt-4 { padding-top: 1rem; }
.pt-6 { padding-top: 1.5rem; }
.pb-2 { padding-bottom: 0.5rem; }
.pb-3 { padding-bottom: 0.75rem; }
.pb-4 { padding-bottom: 1rem; }
.pl-1 { padding-left: 0.25rem; }
.pr-1 { padding-right: 0.25rem; }
.pr-2 { padding-right: 0.5rem; }
.mt-0 { margin-top: 0; }
.mt-0\.5 { margin-top: 0.125rem; }
.mt-1 { margin-top: 0.25rem; }
.mt-1\.5 { margin-top: 0.375rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mb-0\.5 { margin-bottom: 0.125rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-1\.5 { margin-bottom: 0.375rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-5 { margin-bottom: 1.25rem; }
.ml-1 { margin-left: 0.25rem; }
.ml-2 { margin-left: 0.5rem; }
.mr-2 { margin-right: 0.5rem; }

/* ---------- Base utility: typography ---------- */
.text-9 { font-size: 9px; line-height: 1.2; }
.text-10 { font-size: 10px; line-height: 1.2; }
.text-11 { font-size: 11px; line-height: 1.3; }
.text-xs { font-size: 0.75rem; line-height: 1rem; }
.text-sm { font-size: 0.875rem; line-height: 1.25rem; }
.text-base { font-size: 1rem; line-height: 1.5rem; }
.text-lg { font-size: 1.125rem; line-height: 1.75rem; }
.text-xl { font-size: 1.25rem; line-height: 1.75rem; }
.text-2xl { font-size: 1.5rem; line-height: 2rem; }
.text-3xl { font-size: 1.875rem; line-height: 2.25rem; }
.text-4xl { font-size: 2.25rem; line-height: 2.5rem; }
.text-5xl { font-size: 3rem; line-height: 1; }

.font-black { font-weight: 900; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }
.font-mono { font-family: var(--font-mono); }
.font-sans { font-family: var(--font-sans); }
.uppercase { text-transform: uppercase; }
.italic { font-style: italic; }
.line-through { text-decoration: line-through; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.whitespace-nowrap { white-space: nowrap; }
.tracking-tight { letter-spacing: -0.025em; }
.tracking-wide { letter-spacing: 0.025em; }
.tracking-wider { letter-spacing: 0.05em; }
.tracking-widest { letter-spacing: 0.1em; }
.leading-tight { line-height: 1.25; }
.leading-relaxed { line-height: 1.625; }
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.break-words { overflow-wrap: break-word; word-break: break-word; }

/* ---------- Base utility: sizing ---------- */
.w-2\.5 { width: 0.625rem; } .h-2\.5 { height: 0.625rem; }
.w-3 { width: 0.75rem; } .h-3 { height: 0.75rem; }
.w-3\.5 { width: 0.875rem; } .h-3\.5 { height: 0.875rem; }
.w-4 { width: 1rem; } .h-4 { height: 1rem; }
.w-5 { width: 1.25rem; } .h-5 { height: 1.25rem; }
.w-6 { width: 1.5rem; } .h-6 { height: 1.5rem; }
.w-7 { width: 1.75rem; } .h-7 { height: 1.75rem; }
.w-8 { width: 2rem; } .h-8 { height: 2rem; }
.w-10 { width: 2.5rem; } .h-10 { height: 2.5rem; }
.w-11 { width: 2.75rem; } .h-11 { height: 2.75rem; }
.w-12 { width: 3rem; } .h-12 { height: 3rem; }
.w-14 { width: 3.5rem; } .h-14 { height: 3.5rem; }
.w-16 { width: 4rem; } .h-16 { height: 4rem; }
.w-20 { width: 5rem; } .h-20 { height: 5rem; }
.w-28 { width: 7rem; } .h-28 { height: 7rem; }
.w-64 { width: 16rem; } .h-64 { height: 16rem; }
.min-h-screen { min-height: 100vh; }
.min-h-36 { min-height: 36px; }
.min-h-44 { min-height: 44px; }
.min-h-48 { min-height: 48px; }
.min-h-52 { min-height: 52px; }
.min-h-64 { min-height: 64px; }
.min-w-44 { min-width: 44px; }
.maxw-md { max-width: 28rem; }
.maxw-lg { max-width: 32rem; }
.maxw-xl { max-width: 36rem; }
.maxw-2xl { max-width: 42rem; }
.maxw-3xl { max-width: 48rem; }
.maxw-4xl { max-width: 56rem; }
.maxw-7xl { max-width: 80rem; }
.max-h-90vh { max-height: 90vh; }
.w-0\.5 { width: 2px; }
.h-2\.5 { height: 0.625rem; }

/* ---------- Base utility: shadows ---------- */
.shadow-sm { box-shadow: 0 1px 2px 0 rgba(0,0,0,0.05); }
.shadow { box-shadow: 0 1px 3px 0 rgba(0,0,0,0.1), 0 1px 2px -1px rgba(0,0,0,0.1); }
.shadow-md { box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1); }
.shadow-lg { box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1); }
.shadow-xl { box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1); }
.shadow-2xl { box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); }
.shadow-inner { box-shadow: inset 0 2px 4px 0 rgba(0,0,0,0.06); }

/* 3D tactile shadows */
.sh-blue { box-shadow: 0 4px 0 var(--c-blue-dark); }
.sh-blue-5 { box-shadow: 0 5px 0 var(--c-blue-dark); }
.sh-blue-3 { box-shadow: 0 3px 0 var(--c-blue-dark); }
.sh-blue-2 { box-shadow: 0 2px 0 var(--c-blue-dark); }
.sh-green { box-shadow: 0 4px 0 var(--c-green-dark); }
.sh-green-3 { box-shadow: 0 3px 0 var(--c-green-dark); }
.sh-green-2 { box-shadow: 0 2px 0 var(--c-green-dark); }
.sh-red { box-shadow: 0 4px 0 var(--c-red-dark); }
.sh-red-3 { box-shadow: 0 3px 0 var(--c-red-dark); }
.sh-red-4 { box-shadow: 0 4px 0 var(--c-red-deep); }
.sh-amber { box-shadow: 0 4px 0 var(--c-amber-dark); }
.sh-amber-3 { box-shadow: 0 3px 0 var(--c-amber-dark); }
.sh-yellow { box-shadow: 0 4px 0 var(--c-yellow-dark); }
.sh-yellow-3 { box-shadow: 0 3px 0 var(--c-yellow-dark); }
.sh-slate-2 { box-shadow: 0 2px 0 var(--c-slate-800); }
.sh-slate-3 { box-shadow: 0 3px 0 var(--c-slate-800); }
.sh-slate-4 { box-shadow: 0 4px 0 var(--c-slate-800); }
.sh-app-3 { box-shadow: 0 3px 0 var(--c-app); }
.sh-icon-blue { box-shadow: 2px 2px 0 var(--c-blue-dark); }
.sh-icon-red { box-shadow: 3px 3px 0 var(--c-red-deep); }
.sh-icon-green { box-shadow: 2px 2px 0 var(--c-green-dark); }
.sh-icon-yellow { box-shadow: 3px 3px 0 var(--c-yellow-dark); }
.sh-glow-yellow { box-shadow: 0 0 8px #fde047; }
.sh-glow-yellow-lg { box-shadow: 0 0 10px #FDE047; }
.sh-glow-red { box-shadow: 0 0 15px #F43F5E; }
.sh-glow-green { box-shadow: 0 0 15px #10B981; }
.sh-glow-blue { box-shadow: 0 0 15px #3B82F6; }

/* ---------- Base utility: opacity, cursor, etc. ---------- */
.opacity-20 { opacity: 0.2; }
.opacity-40 { opacity: 0.4; }
.opacity-50 { opacity: 0.5; }
.opacity-60 { opacity: 0.6; }
.opacity-80 { opacity: 0.8; }
.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }
.touch-manipulation { touch-action: manipulation; }
.touch-none { touch-action: none; }
.touch-pan-x { touch-action: pan-x; }
.select-none { user-select: none; }

/* transitions */
.transition-all { transition: all 0.15s ease; }
.transition-colors { transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease; }
.transition-transform { transition: transform 0.15s ease; }
.duration-300 { transition-duration: 0.3s; }
.duration-500 { transition-duration: 0.5s; }

/* hover translate / shadows */
.hover-translate-y:hover { transform: translateY(-0.25rem); }
.hover-translate-y-1:hover { transform: translateY(0.125rem); }
.active-translate-y-1:active { transform: translateY(0.25rem); }
.active-translate-y-2:active { transform: translateY(0.5rem); }
.active-shadow-none:active { box-shadow: none; }
.hover-scale:hover { transform: scale(1.05); }
.hover-bg-panel:hover { background: var(--c-panel); }
.hover-bg-panel2:hover { background: var(--c-panel2); }
.hover-bg-panel-60:hover { background: rgba(51, 65, 85, 0.6); }
.hover-bg-blue-deep:hover { background: var(--c-blue-deep); }
.hover-bg-blue-dark:hover { background: var(--c-blue-dark); }
.hover-bg-green-deep:hover { background: var(--c-green-deep); }
.hover-bg-red-bright:hover { background: var(--c-red-bright); }
.hover-bg-rose-dark:hover { background: var(--c-rose-dark); }
.hover-text-white:hover { color: var(--c-white); }

/* ---------- Animations ---------- */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideDown { from { opacity: 0; transform: translateY(-1rem); } to { opacity: 1; transform: none; } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.animate-fade-in { animation: fadeIn 0.3s ease-out; }
.animate-slide-down { animation: slideDown 0.3s ease-out; }
.animate-pulse { animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite; }

/* ---------- Math rendering helpers ---------- */
.math-inline { display: inline-block; max-width: 100%; vertical-align: middle; color: inherit; }
.mathbox { width: 100%; max-width: 100%; overflow: hidden; display: flex; justify-content: center; align-items: center; }
.mathinner { display: inline-flex; justify-content: center; align-items: center; flex-shrink: 0; }

/* ---------- Icon sizing ---------- */
.i-3 { width: 12px; height: 12px; }
.i-3\.5 { width: 14px; height: 14px; }
.i-4 { width: 16px; height: 16px; }
.i-5 { width: 20px; height: 20px; }
.i-6 { width: 24px; height: 24px; }
.i-8 { width: 32px; height: 32px; }
.fill-current { fill: currentColor; }
.fill-white { fill: #fff; }

/* ============================================================
   SHELL & NAVBAR
   ============================================================ */
.shell { min-height: 100vh; display: flex; flex-direction: column; }
.main { flex: 1; width: 100%; max-width: 80rem; margin: 0 auto; padding: 1.5rem 1rem; }

.navbar {
  background: var(--c-card);
  border-bottom: 4px solid var(--c-blue);
  position: sticky;
  top: 0;
  z-index: 40;
  padding: 0.75rem 1rem;
  box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
}
.nav-inner { max-width: 80rem; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; }
.nav-brand { display: flex; align-items: center; gap: 0.75rem; cursor: pointer; }
.nav-logo {
  width: 2.75rem; height: 2.75rem;
  background: var(--c-red);
  border-radius: 0.75rem;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem; font-weight: 900; color: #fff;
  box-shadow: 3px 3px 0 var(--c-red-deep);
}
.nav-brand:hover .nav-logo { transform: scale(1.05); }
.nav-title { font-weight: 900; font-size: 1.125rem; letter-spacing: -0.025em; color: var(--c-slate-100); text-transform: uppercase; }
.nav-title span { color: var(--c-blue); }
.nav-subtitle { font-size: 10px; font-weight: 700; color: var(--c-slate-400); letter-spacing: 0.1em; text-transform: uppercase; }
.nav-caps-badge {
  font-size: 10px; font-weight: 900; padding: 0.125rem 0.5rem; border-radius: 0.25rem;
  background: var(--c-green); color: #fff; text-transform: uppercase; letter-spacing: 0.05em;
  box-shadow: 0 2px 0 var(--c-green-dark);
}
.pill-count {
  font-size: 10px; font-weight: 900; padding: 0.125rem 0.5rem; border-radius: 9999px;
  background: var(--c-yellow); color: var(--c-yellow-text); text-transform: uppercase;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}
.nav-stats {
  display: none; align-items: center; gap: 1.25rem;
  background: var(--c-app); border: 2px solid var(--c-slate-700);
  padding: 0.5rem 1rem; border-radius: 1rem; box-shadow: inset 0 2px 4px rgba(0,0,0,0.06);
}
.nav-stats .stat-level { display: flex; align-items: center; gap: 0.5rem; }
.nav-stats .lvl-label { font-size: 0.75rem; font-weight: 900; color: var(--c-yellow); text-transform: uppercase; letter-spacing: 0.05em; }
.xp-track { width: 7rem; height: 0.625rem; background: var(--c-slate-700); border-radius: 9999px; overflow: hidden; border: 1px solid var(--c-slate-600); }
.xp-fill { height: 100%; background: var(--c-yellow); border-radius: 9999px; box-shadow: 0 0 8px #fde047; transition: width 0.3s; }
.nav-stats .xp-hint { font-size: 10px; font-weight: 700; color: var(--c-slate-400); }
.nav-divider { height: 1.5rem; width: 2px; background: var(--c-slate-700); }
.nav-stats .score-label, .nav-stats .score-value { display: block; text-align: center; }
.nav-stats .score-label { font-size: 10px; font-weight: 700; color: var(--c-slate-400); text-transform: uppercase; letter-spacing: 0.05em; }
.nav-stats .score-value { font-size: 0.875rem; font-family: var(--font-mono); font-weight: 900; color: var(--c-sky); }
.nav-streak { display: flex; align-items: center; gap: 0.5rem; background: var(--c-yellow); color: var(--c-yellow-text); padding: 0.25rem 0.75rem; border-radius: 0.75rem; font-weight: 900; font-size: 0.75rem; box-shadow: 0 3px 0 var(--c-yellow-dark); }
.nav-actions { display: flex; align-items: center; gap: 0.5rem; }

.nav-btn {
  min-height: 44px; padding: 0.5rem 0.75rem; border-radius: 0.75rem;
  background: var(--c-panel); color: #fff; border: 2px solid var(--c-slate-600);
  font-size: 0.75rem; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em;
  display: flex; align-items: center; gap: 0.375rem;
  box-shadow: 0 3px 0 var(--c-slate-800); transition: all 0.15s ease; touch-action: manipulation;
}
.nav-btn:hover { background: var(--c-panel2); }
.nav-btn:active { background: var(--c-slate-800); }
.nav-btn .btn-label { display: none; }
.nav-btn-blue { background: var(--c-blue); border-color: var(--c-blue); box-shadow: 0 4px 0 var(--c-blue-dark); }
.nav-btn-blue:hover { background: var(--c-blue-deep); }
.nav-btn-blue:active { background: var(--c-blue-dark); box-shadow: none; }
.nav-btn-round { min-width: 44px; padding: 0.5rem; justify-content: center; }
.nav-badge-dot {
  position: absolute; top: -0.375rem; right: -0.375rem; width: 1.25rem; height: 1.25rem;
  border-radius: 9999px; background: var(--c-red); color: #fff; font-family: var(--font-mono);
  font-weight: 900; font-size: 10px; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 2px 0 var(--c-red-deep);
}
.nav-profile {
  min-height: 44px; display: flex; align-items: center; gap: 0.625rem;
  background: var(--c-panel); padding: 0.375rem 0.75rem; border-radius: 0.75rem;
  border: 2px solid var(--c-slate-600); box-shadow: 0 3px 0 var(--c-slate-800);
  cursor: pointer; transition: all 0.15s ease; touch-action: manipulation;
}
.nav-profile:hover { background: var(--c-panel2); }
.nav-avatar {
  width: 1.75rem; height: 1.75rem; border-radius: 0.5rem; background: var(--c-blue);
  color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 900; font-size: 0.75rem;
}
.nav-profile-meta { display: none; text-align: left; }
.nav-profile-meta .pname { font-size: 0.75rem; font-weight: 700; color: #fff; line-height: 1.25; max-width: 90px; }
.nav-profile-meta .pgrade { font-size: 10px; color: var(--c-slate-400); font-weight: 600; }

/* ============================================================
   DASHBOARD / MENU
   ============================================================ */
.hero {
  background: var(--c-card); border-bottom: 4px solid var(--c-blue); border-radius: 1.5rem;
  padding: 1.5rem; position: relative; overflow: hidden; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.25rem 0.75rem; border-radius: 9999px;
  background: var(--c-panel); border: 2px solid var(--c-slate-600); color: var(--c-sky);
  font-size: 0.75rem; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}
.hero-title { font-size: 1.875rem; font-weight: 900; color: #fff; letter-spacing: -0.025em; line-height: 1.15; text-transform: uppercase; }
.hero-title span { color: var(--c-blue); }
.hero-desc { font-size: 0.875rem; color: var(--c-slate-400); font-weight: 500; line-height: 1.625; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; padding-top: 0.75rem; }
.hero-side { display: none; }

.btn-hero {
  padding: 0.875rem 1.5rem; border-radius: 1rem; font-size: 0.875rem; font-weight: 900;
  text-transform: uppercase; letter-spacing: 0.05em; display: inline-flex; align-items: center; gap: 0.5rem;
  transition: all 0.15s ease; touch-action: manipulation; color: #fff;
}
.btn-hero-blue { background: var(--c-blue); box-shadow: 0 5px 0 var(--c-blue-dark); }
.btn-hero-blue:hover { background: var(--c-blue-deep); transform: translateY(0.125rem); }
.btn-hero-blue:active { transform: translateY(0.25rem); box-shadow: none; }
.btn-hero-green { background: var(--c-green); box-shadow: 0 5px 0 var(--c-green-dark); }
.btn-hero-green:hover { background: var(--c-green-deep); transform: translateY(0.125rem); }
.btn-hero-green:active { transform: translateY(0.25rem); box-shadow: none; }

.hero-rank-card {
  padding: 1.5rem; border-radius: 1.5rem; background: var(--c-app); border: 4px solid var(--c-slate-700);
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); text-align: right;
}
.hero-rank-card .rank-label { font-size: 10px; color: var(--c-slate-400); font-weight: 900; text-transform: uppercase; letter-spacing: 0.1em; }
.hero-rank-card .rank-value { font-size: 1.875rem; font-family: var(--font-mono); font-weight: 900; color: var(--c-yellow); margin-top: 0.25rem; }
.hero-rank-card .rank-meta { font-size: 0.75rem; color: var(--c-sky); font-weight: 700; display: flex; align-items: center; justify-content: flex-end; gap: 0.375rem; }
.hero-rank-card .rank-streak { background: var(--c-yellow); color: var(--c-yellow-text); padding: 0.25rem 0.75rem; border-radius: 0.75rem; text-align: center; font-weight: 900; font-size: 0.75rem; box-shadow: 0 3px 0 var(--c-yellow-dark); text-transform: uppercase; margin-top: 0.5rem; }

.section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.25rem; }
.section-title { font-size: 1.25rem; font-weight: 900; color: #fff; text-transform: uppercase; letter-spacing: -0.025em; display: flex; align-items: center; gap: 0.5rem; }

.mode-grid { display: grid; grid-template-columns: 1fr; gap: 1.25rem; }
.mode-card {
  background: var(--c-card); border-radius: 1.5rem; padding: 1.5rem; cursor: pointer;
  box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); transition: all 0.15s ease;
  display: flex; flex-direction: column; justify-content: space-between;
}
.mode-card:hover { background: rgba(51,65,85,0.6); transform: translateY(-0.25rem); }
.mode-card-blue { border-bottom: 4px solid var(--c-blue); }
.mode-card-green { border-bottom: 4px solid var(--c-green); }
.mode-card-red { border-bottom: 4px solid var(--c-red); }
.mode-card-amber { border-bottom: 4px solid var(--c-amber); }
.mode-icon {
  width: 3.5rem; height: 3.5rem; border-radius: 1rem; color: #fff; display: flex; align-items: center;
  justify-content: center; font-size: 1.5rem; margin-bottom: 1rem; transition: transform 0.15s ease;
}
.mode-card:hover .mode-icon { transform: scale(1.05); }
.mode-icon-blue { background: var(--c-blue); box-shadow: 0 4px 0 var(--c-blue-dark); }
.mode-icon-green { background: var(--c-green); box-shadow: 0 4px 0 var(--c-green-dark); }
.mode-icon-red { background: var(--c-red); box-shadow: 0 4px 0 var(--c-red-deep); }
.mode-icon-amber { background: var(--c-amber); box-shadow: 0 4px 0 var(--c-amber-dark); }
.mode-tag { font-size: 10px; font-weight: 900; text-transform: uppercase; letter-spacing: 0.1em; }
.mode-title { font-size: 1.125rem; font-weight: 900; color: #fff; margin-top: 0.25rem; margin-bottom: 0.5rem; text-transform: uppercase; }
.mode-desc { font-size: 0.75rem; color: var(--c-slate-400); font-weight: 500; line-height: 1.625; }
.mode-foot {
  padding-top: 1rem; margin-top: 1rem; border-top: 2px solid var(--c-slate-700);
  display: flex; align-items: center; justify-content: space-between; font-size: 0.75rem; font-weight: 900;
  text-transform: uppercase; letter-spacing: 0.05em;
}

.dash-grid { display: grid; grid-template-columns: 1fr; gap: 1.5rem; align-items: start; }
.quick-widget {
  background: var(--c-card); border-bottom: 4px solid var(--c-blue); border-radius: 1.5rem;
  padding: 1.5rem; box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
}
.quick-widget-head { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }
.quick-icon {
  width: 2rem; height: 2rem; border-radius: 0.5rem; background: var(--c-blue); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 900; font-size: 1rem;
  box-shadow: 2px 2px 0 var(--c-blue-dark);
}
.quick-widget h3 { margin: 0; font-weight: 900; color: #fff; font-size: 1rem; text-transform: uppercase; letter-spacing: -0.025em; }
.quick-widget .quick-sub { font-size: 11px; font-weight: 700; color: var(--c-slate-400); }
.quick-widget p { font-size: 0.75rem; color: var(--c-slate-400); font-weight: 500; line-height: 1.625; margin: 0 0 0.75rem; }
.quick-btn {
  width: 100%; padding: 0.875rem; background: var(--c-app); border: 2px solid var(--c-slate-700);
  border-radius: 1rem; font-size: 0.75rem; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em;
  color: #fff; display: flex; align-items: center; justify-content: space-between;
  box-shadow: 0 3px 0 var(--c-app); transition: all 0.15s ease; margin-bottom: 0.5rem;
}
.quick-btn:hover { background: var(--c-panel); transform: translateY(0.125rem); }

/* ============================================================
   CAST DIAGRAM
   ============================================================ */
.cast {
  background: var(--c-card); border-bottom: 4px solid var(--c-green); color: #fff; border-radius: 1.5rem;
  padding: 1.25rem; box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
}
.cast-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; margin-bottom: 1.25rem; border-bottom: 2px solid var(--c-slate-700); padding-bottom: 1rem; gap: 0.5rem; }
.cast-icon { width: 2rem; height: 2rem; border-radius: 0.5rem; background: var(--c-green); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 900; font-size: 1rem; box-shadow: 2px 2px 0 var(--c-green-dark); flex-shrink: 0; }
.cast h3 { margin: 0; font-weight: 900; color: #fff; font-size: 1rem; text-transform: uppercase; letter-spacing: -0.025em; }
.cast-sub { font-size: 11px; font-weight: 700; color: var(--c-slate-400); }
.cast-badge { font-size: 0.75rem; padding: 0.25rem 0.75rem; border-radius: 9999px; background: var(--c-blue); color: #fff; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; box-shadow: 0 2px 0 var(--c-blue-dark); }
.cast-body { display: grid; grid-template-columns: 1fr; gap: 1.5rem; align-items: center; }

.cast-plane { position: relative; display: flex; justify-content: center; align-items: center; padding: 0.5rem 0; }
.cast-circle {
  width: 16rem; height: 16rem; position: relative; border-radius: 9999px; border: 4px solid var(--c-slate-700);
  background: var(--c-app); padding: 0.5rem; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); touch-action: manipulation;
}
.cast-axis-h { position: absolute; top: 50%; left: 0.5rem; right: 0.5rem; height: 4px; background: var(--c-slate-600); transform: translateY(-50%); z-index: 0; }
.cast-axis-v { position: absolute; left: 50%; top: 0.5rem; bottom: 0.5rem; width: 4px; background: var(--c-slate-600); transform: translateX(-50%); z-index: 0; }
.cast-label { position: absolute; font-size: 11px; font-family: var(--font-mono); font-weight: 900; background: var(--c-app); padding: 0 0.375rem; border-radius: 0.25rem; border: 1px solid var(--c-slate-700); z-index: 2; }
.cast-label-top { top: 0.25rem; left: 50%; transform: translateX(-50%); color: var(--c-yellow); }
.cast-label-left { left: 0.25rem; top: 50%; transform: translateY(-50%); color: var(--c-red); }
.cast-label-bottom { bottom: 0.25rem; left: 50%; transform: translateX(-50%); color: var(--c-amber); }
.cast-label-right { right: 0.25rem; top: 50%; transform: translateY(-50%); color: var(--c-green); }

.quad {
  position: absolute; width: 7rem; height: 7rem; display: flex; flex-direction: column;
  align-items: center; justify-content: center; cursor: pointer; transition: all 0.3s ease; touch-action: manipulation;
}
.quad:hover { background: rgba(51,65,85,0.6); }
.quad-1 { top: 0.5rem; right: 0.5rem; border-top-right-radius: 9999px; }
.quad-2 { top: 0.5rem; left: 0.5rem; border-top-left-radius: 9999px; }
.quad-3 { bottom: 0.5rem; left: 0.5rem; border-bottom-left-radius: 9999px; }
.quad-4 { bottom: 0.5rem; right: 0.5rem; border-bottom-right-radius: 9999px; }
.quad.active-1 { background: rgba(16,185,129,0.3); border: 3px solid var(--c-green); box-shadow: 0 0 15px #10B981; }
.quad.active-2 { background: rgba(244,63,94,0.3); border: 3px solid var(--c-red); box-shadow: 0 0 15px #F43F5E; }
.quad.active-3 { background: rgba(253,224,71,0.3); border: 3px solid var(--c-yellow); box-shadow: 0 0 15px #FDE047; }
.quad.active-4 { background: rgba(59,130,246,0.3); border: 3px solid var(--c-blue); box-shadow: 0 0 15px #3B82F6; }
.quad-letter { font-size: 1.5rem; font-weight: 900; }
.quad-name { font-size: 10px; font-weight: 700; color: #fff; text-transform: uppercase; }
.quad-angle { font-size: 9px; color: var(--c-slate-300); font-family: var(--font-mono); }
.quad-rule { font-size: 9px; font-weight: 900; text-transform: uppercase; margin-top: 0.125rem; }
.cast-origin {
  position: absolute; top: 50%; left: 50%; width: 1rem; height: 1rem; background: var(--c-yellow);
  border-radius: 9999px; transform: translate(-50%, -50%); border: 2px solid var(--c-app); z-index: 10;
}

.cast-details { display: flex; flex-direction: column; gap: 1rem; }
.angle-sim { background: var(--c-app); padding: 1rem; border-radius: 1rem; border: 2px solid var(--c-slate-700); box-shadow: inset 0 2px 4px rgba(0,0,0,0.06); }
.angle-sim-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; }
.angle-sim-head span:first-child { font-size: 0.75rem; font-weight: 900; text-transform: uppercase; color: var(--c-slate-400); letter-spacing: 0.05em; }
.angle-sim-head .angle-value { font-size: 0.875rem; font-family: var(--font-mono); font-weight: 900; color: var(--c-yellow); background: var(--c-panel); padding: 0.125rem 0.625rem; border-radius: 0.5rem; border: 1px solid var(--c-slate-600); }
.range { width: 100%; height: 0.75rem; background: var(--c-panel); border-radius: 0.5rem; appearance: none; cursor: pointer; accent-color: var(--c-blue); touch-action: none; }
.angle-scale { display: flex; justify-content: space-between; font-size: 10px; color: var(--c-slate-400); margin-top: 0.375rem; font-family: var(--font-mono); font-weight: 700; }
.rule-box { background: var(--c-app); border: 2px solid var(--c-slate-700); border-radius: 1rem; padding: 1rem; box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
.rule-head { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.75rem; }
.rule-dot { width: 0.875rem; height: 0.875rem; border-radius: 9999px; }
.rule-head h4 { margin: 0; font-weight: 900; color: #fff; font-size: 0.875rem; text-transform: uppercase; letter-spacing: -0.025em; }
.rule-formulas { font-size: 0.75rem; font-family: var(--font-mono); color: var(--c-slate-300); }
.rule-formulas .f-ok { color: var(--c-green); font-weight: 700; }
.rule-formulas .f-no { color: var(--c-red); font-weight: 700; }
.rule-note { color: var(--c-slate-400); font-size: 11px; font-family: var(--font-sans); margin-top: 0.25rem; }

/* ============================================================
   GAME ARENA
   ============================================================ */
.arena { display: flex; flex-direction: column; gap: 1.25rem; }
.arena-head {
  background: var(--c-card); border-bottom: 4px solid var(--c-blue); border-radius: 1rem; padding: 1rem;
  display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; flex-wrap: wrap;
  box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
}
.arena-title-row { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.arena-icon {
  width: 2.5rem; height: 2.5rem; border-radius: 0.75rem; background: var(--c-red); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 900; font-size: 1.25rem;
  box-shadow: 2px 2px 0 var(--c-red-deep);
}
.arena-title { font-weight: 900; color: #fff; font-size: 0.875rem; text-transform: uppercase; letter-spacing: -0.025em; margin: 0; }
.arena-sub { font-size: 11px; font-weight: 700; color: var(--c-slate-400); }
.q-chip {
  font-size: 10px; font-weight: 900; padding: 0.125rem 0.625rem; border-radius: 9999px; background: var(--c-blue);
  color: #fff; text-transform: uppercase; letter-spacing: 0.05em; box-shadow: 0 2px 0 var(--c-blue-dark);
}
.arena-counters { display: flex; align-items: center; gap: 0.75rem; }
.hearts { display: flex; align-items: center; gap: 0.25rem; background: var(--c-app); padding: 0.375rem 0.75rem; border-radius: 0.75rem; border: 2px solid var(--c-slate-700); box-shadow: inset 0 2px 4px rgba(0,0,0,0.06); }
.heart-on { color: var(--c-red); fill: var(--c-red); }
.heart-off { color: var(--c-slate-600); }
.timer {
  display: flex; align-items: center; gap: 0.375rem; font-family: var(--font-mono); font-weight: 900; font-size: 0.875rem;
  padding: 0.375rem 0.75rem; border-radius: 0.75rem; border: 2px solid; box-shadow: inset 0 2px 4px rgba(0,0,0,0.06);
  background: var(--c-app); border-color: var(--c-slate-700); color: var(--c-yellow);
}
.timer.warn { background: rgba(244,63,94,0.2); border-color: var(--c-red); color: var(--c-red); animation: pulse 2s cubic-bezier(0.4,0,0.6,1) infinite; }
.points-box { background: var(--c-app); padding: 0.25rem 0.75rem; border-radius: 0.75rem; border: 2px solid var(--c-slate-700); text-align: right; }
.points-box .pl { font-size: 9px; color: var(--c-slate-400); display: block; text-transform: uppercase; font-weight: 900; letter-spacing: 0.05em; }
.points-box .pv { font-size: 0.875rem; font-family: var(--font-mono); font-weight: 900; color: var(--c-sky); }
.quit-btn { min-width: 44px; min-height: 44px; padding: 0.5rem; border-radius: 0.75rem; background: var(--c-panel); color: var(--c-slate-300); border: 2px solid var(--c-slate-600); box-shadow: 0 2px 0 var(--c-slate-800); transition: all 0.15s ease; display: flex; align-items: center; justify-content: center; touch-action: manipulation; }
.quit-btn:hover { background: var(--c-panel2); color: #fff; }

.powerups-bar { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; padding: 0 0.25rem; flex-wrap: wrap; }
.powerups-left { display: flex; align-items: center; gap: 0.5rem; }
.power-btn {
  min-height: 44px; padding: 0.5rem 0.875rem; border-radius: 0.75rem; background: var(--c-panel); color: #fff; font-size: 0.75rem;
  font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; display: flex; align-items: center; gap: 0.375rem;
  border: 2px solid var(--c-slate-600); box-shadow: 0 3px 0 var(--c-slate-800); transition: all 0.15s ease; touch-action: manipulation;
}
.power-btn:hover { background: var(--c-panel2); transform: translateY(0.125rem); }
.power-btn:disabled { opacity: 0.4; }
.power-btn-skip { background: var(--c-red); box-shadow: 0 3px 0 var(--c-red-dark); }
.power-btn-skip:hover { background: var(--c-red-bright); }
.power-btn-skip:disabled { opacity: 0.4; }

.cast-drawer { animation: slideDown 0.3s ease-out; }

.question-card {
  background: var(--c-white); border-radius: 1.5rem; padding: 1.25rem; text-align: center; display: flex;
  flex-direction: column; gap: 1.5rem; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); position: relative;
  overflow: hidden; border: 4px solid var(--c-slate-700);
}
.question-tags { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem; }
.question-tag {
  background: var(--c-blue); color: #fff; padding: 0.25rem 0.875rem; border-radius: 9999px; font-weight: 900;
  font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; box-shadow: 0 3px 0 var(--c-blue-dark);
}
.question-tag-red { background: var(--c-red); box-shadow: 0 3px 0 var(--c-red-dark); }
.question-label { color: var(--c-slate-500); font-size: 0.75rem; font-weight: 900; text-transform: uppercase; letter-spacing: 0.1em; }
.expr-box {
  background: var(--c-slate-100); padding: 1rem; border-radius: 1rem; border: 4px dashed var(--c-slate-300);
  display: flex; justify-content: center; align-items: center; box-shadow: inset 0 2px 4px rgba(0,0,0,0.06);
  overflow: hidden; width: 100%;
}
.expr-box .math-inline, .expr-box .mathbox { color: var(--c-app); }
.question-hint { font-size: 0.75rem; color: var(--c-slate-500); font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; padding-top: 0.25rem; }

.option-grid { display: grid; grid-template-columns: 1fr; gap: 0.75rem; padding-top: 0.5rem; }
.option-btn {
  min-height: 64px; border-radius: 1rem; display: flex; align-items: center; justify-content: space-between;
  padding: 0.5rem 1.25rem; font-weight: 900; font-size: 1.125rem; transition: all 0.15s ease;
  touch-action: manipulation; overflow: hidden; color: #fff; text-align: left;
}
.option-btn:hover { transform: translateY(0.25rem); }
.option-btn:active { transform: translateY(0.5rem); }
.option-btn:disabled { cursor: not-allowed; }
.opt-blue { background: var(--c-blue); border-bottom: 6px solid var(--c-blue-dark); box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
.opt-red { background: var(--c-red); border-bottom: 6px solid var(--c-red-dark); box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
.opt-green { background: var(--c-green); border-bottom: 6px solid var(--c-green-dark); box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
.opt-amber { background: var(--c-amber); border-bottom: 6px solid var(--c-amber-dark); box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
.opt-correct { background: var(--c-green); border-bottom: 6px solid var(--c-green-dark); box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1); }
.opt-wrong { background: var(--c-red); border-bottom: 6px solid var(--c-red-deep); opacity: 0.8; text-decoration: line-through; }
.opt-dim { background: var(--c-slate-200); color: var(--c-slate-400); border-bottom: 6px solid var(--c-slate-300); opacity: 0.4; }
.opt-elim { opacity: 0.2; cursor: not-allowed; text-decoration: line-through; }
.option-num {
  width: 1.75rem; height: 1.75rem; border-radius: 0.5rem; background: rgba(0,0,0,0.2); color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 0.75rem; font-family: var(--font-sans);
  font-weight: 900; flex-shrink: 0;
}
.option-text { flex: 1; text-align: center; font-weight: 700; letter-spacing: 0.025em; overflow: hidden; padding: 0 0.5rem; display: flex; align-items: center; justify-content: center; }
.option-text .math-inline, .option-text .mathbox { color: #fff; }
.option-check { flex-shrink: 0; margin-left: 0.25rem; }

.explain { padding: 1rem; border-radius: 1rem; text-align: left; display: flex; flex-direction: column; gap: 0.75rem; border: 2px solid; animation: fadeIn 0.3s ease-out; }
.explain-ok { background: var(--c-success-bg); border-color: var(--c-green); color: var(--c-green-text); }
.explain-no { background: var(--c-error-bg); border-color: var(--c-red); color: var(--c-red-text); }
.explain-head { display: flex; align-items: center; gap: 0.5rem; font-weight: 900; font-size: 0.75rem; text-transform: uppercase; letter-spacing: -0.025em; }
.explain-body { font-size: 0.75rem; line-height: 1.625; font-family: var(--font-sans); font-weight: 700; }
.next-btn {
  min-height: 44px; padding: 0.75rem 1.5rem; background: var(--c-blue); color: #fff; font-size: 0.75rem;
  font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; border-radius: 0.75rem;
  box-shadow: 0 4px 0 var(--c-blue-dark); display: inline-flex; align-items: center; gap: 0.5rem;
  transition: all 0.15s ease; touch-action: manipulation; align-self: flex-end;
}
.next-btn:hover { background: var(--c-blue-deep); transform: translateY(0.125rem); }
.next-btn:active { box-shadow: none; }

.metrics-bar { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 0.75rem; padding-top: 0.5rem; }
.metric {
  background: var(--c-card); padding: 0.75rem; border-radius: 1rem; border-bottom: 4px solid var(--c-slate-700);
  text-align: center; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}
.metric-label { color: var(--c-slate-400); font-size: 10px; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; }
.metric-value { font-size: 1.125rem; font-weight: 900; }

/* ============================================================
   MATRIC CHALLENGE
   ============================================================ */
.matric { display: flex; flex-direction: column; gap: 1.5rem; }
.matric-head {
  background: var(--c-card); border-bottom: 4px solid var(--c-green); border-radius: 1.5rem; padding: 1.25rem;
  position: relative; overflow: hidden; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}
.matric-head-top { display: flex; flex-direction: column; align-items: flex-start; justify-content: space-between; gap: 1rem; }
.matric-head-left { display: flex; align-items: center; gap: 1rem; }
.matric-icon {
  width: 3rem; height: 3rem; border-radius: 1rem; background: var(--c-green); color: #fff; display: flex;
  align-items: center; justify-content: center; font-size: 1.5rem; box-shadow: 0 4px 0 var(--c-green-dark); flex-shrink: 0;
}
.matric-title { font-size: 1.125rem; font-weight: 900; color: #fff; text-transform: uppercase; letter-spacing: -0.025em; margin: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }
.matric-badge { font-size: 10px; padding: 0.125rem 0.625rem; border-radius: 9999px; background: var(--c-green); color: #fff; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; box-shadow: 0 2px 0 var(--c-green-dark); }
.matric-sub { font-size: 0.75rem; color: var(--c-slate-400); font-weight: 500; margin-top: 0.25rem; }
.back-btn {
  min-height: 44px; padding: 0.625rem 1.25rem; background: var(--c-panel); color: #fff; border-radius: 1rem;
  font-size: 0.75rem; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; transition: all 0.15s ease;
  border: 2px solid var(--c-slate-600); box-shadow: 0 3px 0 var(--c-slate-800); display: flex; align-items: center; justify-content: center;
}
.back-btn:hover { background: var(--c-panel2); }
.back-btn:active { background: var(--c-slate-800); }

.paper-pills { margin-top: 1.5rem; padding-top: 1.5rem; border-top: 2px solid var(--c-slate-700); display: flex; gap: 0.5rem; overflow-x: auto; padding-bottom: 0.5rem; touch-action: pan-x; }
.paper-pill {
  min-height: 44px; padding: 0.625rem 1rem; border-radius: 1rem; font-size: 0.75rem; font-weight: 900;
  text-transform: uppercase; letter-spacing: 0.05em; white-space: nowrap; transition: all 0.15s ease;
  display: flex; align-items: center; gap: 0.5rem; touch-action: manipulation;
  background: var(--c-app); color: var(--c-slate-400); border: 2px solid var(--c-slate-700);
}
.paper-pill:hover { color: #fff; }
.paper-pill .pill-marks { font-size: 10px; background: rgba(0,0,0,0.3); padding: 0.125rem 0.5rem; border-radius: 0.5rem; color: var(--c-yellow); font-family: var(--font-mono); font-weight: 900; }
.paper-pill-active { background: var(--c-green); color: #fff; box-shadow: 0 4px 0 var(--c-green-dark); }

.workspace { background: var(--c-card); border-bottom: 4px solid var(--c-blue); border-radius: 1.5rem; padding: 1.25rem; display: flex; flex-direction: column; gap: 1.5rem; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); }
.ws-head { display: flex; flex-direction: column; align-items: flex-start; justify-content: space-between; padding-bottom: 1rem; border-bottom: 2px solid var(--c-slate-700); gap: 0.75rem; }
.ws-source { font-size: 0.75rem; font-family: var(--font-mono); font-weight: 900; color: var(--c-yellow); text-transform: uppercase; display: block; margin-bottom: 0.25rem; }
.ws-title { font-size: 1rem; font-weight: 900; color: #fff; text-transform: uppercase; letter-spacing: -0.025em; margin: 0; }
.ws-chips { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.ws-chip {
  min-height: 36px; padding: 0.375rem 0.75rem; background: var(--c-app); border: 2px solid var(--c-slate-700);
  border-radius: 0.75rem; font-size: 0.75rem; font-family: var(--font-mono); font-weight: 900; box-shadow: inset 0 2px 4px rgba(0,0,0,0.06);
  display: flex; align-items: center;
}
.ws-chip.sky { color: var(--c-sky); }
.ws-chip.green { color: var(--c-green); }

.exam-card {
  background: var(--c-white); padding: 1rem; border-radius: 1.5rem; border: 4px solid var(--c-slate-700);
  display: flex; flex-direction: column; gap: 0.75rem; text-align: center; box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  width: 100%; overflow: hidden;
}
.exam-card .eq-text { font-size: 0.75rem; color: var(--c-slate-500); font-weight: 900; text-transform: uppercase; letter-spacing: 0.1em; }
.exam-card .eq-latex { padding: 1rem 0.5rem; color: var(--c-app); font-weight: 900; background: var(--c-slate-100); border-radius: 1rem; border: 4px dashed var(--c-slate-300); display: flex; justify-content: center; align-items: center; overflow: hidden; width: 100%; }
.exam-card .eq-context { font-size: 0.75rem; color: var(--c-slate-500); font-weight: 700; font-style: italic; }

.step-panel { background: var(--c-app); padding: 1rem; border-radius: 1.5rem; border: 2px solid var(--c-slate-700); display: flex; flex-direction: column; gap: 1rem; box-shadow: inset 0 2px 4px rgba(0,0,0,0.06); width: 100%; overflow: hidden; }
.step-head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; }
.step-head .step-label { font-size: 0.75rem; font-weight: 900; color: var(--c-sky); text-transform: uppercase; letter-spacing: 0.05em; font-family: var(--font-mono); }
.step-head .step-mark { font-size: 0.75rem; color: var(--c-yellow); font-weight: 900; background: var(--c-panel); padding: 0.25rem 0.625rem; border-radius: 0.5rem; }
.step-prompt { font-size: 0.875rem; font-weight: 900; color: #fff; margin: 0; }
.eval-box {
  padding: 0.75rem; background: var(--c-card); border-radius: 1rem; font-size: 0.875rem; color: var(--c-yellow);
  font-weight: 900; border: 2px solid var(--c-slate-700); width: 100%; overflow: hidden; display: flex;
  flex-direction: column; align-items: flex-start; gap: 0.5rem;
}
.eval-box .eval-label { color: var(--c-slate-400); font-family: var(--font-sans); font-size: 0.75rem; text-transform: uppercase; flex-shrink: 0; }
.eval-box .eval-math { width: 100%; flex: 1; overflow: hidden; display: flex; align-items: center; }

.step-opt-grid { display: grid; grid-template-columns: 1fr; gap: 0.75rem; padding-top: 0.5rem; }
.step-opt {
  min-height: 52px; padding: 0.75rem 1rem; border-radius: 1rem; font-size: 0.875rem; font-weight: 900;
  transition: all 0.15s ease; text-align: left; display: flex; align-items: center; justify-content: space-between;
  touch-action: manipulation; background: var(--c-card); color: #fff; border-bottom: 4px solid var(--c-slate-700);
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}
.step-opt:hover { background: var(--c-panel); transform: translateY(0.125rem); }
.step-opt:active { transform: translateY(0.25rem); }
.step-opt .opt-inner { width: 85%; overflow: hidden; flex: 1; padding-right: 0.25rem; }
.step-opt.correct { background: var(--c-green); color: #fff; border-bottom: 4px solid var(--c-green-dark); font-weight: 900; }
.step-opt.wrong { background: var(--c-red); color: #fff; border-bottom: 4px solid var(--c-red-deep); text-decoration: line-through; }
.step-opt.dim { background: var(--c-app); border-bottom: 4px solid var(--c-slate-800); color: var(--c-slate-500); opacity: 0.4; }

.matric-explain { padding: 1rem; border-radius: 1rem; border: 2px solid; margin-top: 1rem; font-size: 0.75rem; line-height: 1.625; display: flex; flex-direction: column; gap: 0.75rem; animation: fadeIn 0.2s ease-out; width: 100%; overflow: hidden; }
.matric-explain.ok { background: var(--c-success-bg); border-color: var(--c-green); color: var(--c-green-text); }
.matric-explain.no { background: var(--c-error-bg); border-color: var(--c-red); color: var(--c-red-text); }

.matric-done { background: var(--c-card); border-bottom: 4px solid var(--c-yellow); border-radius: 1.5rem; padding: 1.5rem; text-align: center; display: flex; flex-direction: column; gap: 1.5rem; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); width: 100%; overflow: hidden; }
.done-icon {
  width: 4rem; height: 4rem; border-radius: 1.5rem; background: var(--c-yellow); color: var(--c-yellow-text);
  font-size: 2rem; display: flex; align-items: center; justify-content: center; margin: 0 auto; box-shadow: 0 6px 0 var(--c-yellow-dark);
}
.memo-box { padding: 1.5rem; background: var(--c-app); border-radius: 1.5rem; border: 2px solid var(--c-slate-700); max-width: 28rem; margin: 0 auto; box-shadow: inset 0 2px 4px rgba(0,0,0,0.06); }
.memo-label { font-size: 0.75rem; color: var(--c-slate-400); text-transform: uppercase; font-weight: 900; letter-spacing: 0.05em; }
.memo-value { font-size: 1.875rem; font-family: var(--font-mono); font-weight: 900; color: var(--c-yellow); }
.memo-points { font-size: 0.75rem; font-weight: 900; color: var(--c-green); text-transform: uppercase; }
.solution-box { padding: 1.25rem; background: var(--c-app); border-radius: 1.5rem; border: 2px solid var(--c-slate-700); text-align: left; max-width: 36rem; margin: 0 auto; display: flex; flex-direction: column; gap: 0.75rem; font-size: 0.75rem; width: 100%; overflow: hidden; }
.solution-title { font-weight: 900; color: var(--c-sky); display: flex; align-items: center; gap: 0.375rem; text-transform: uppercase; font-size: 0.75rem; }
.final-answer { padding: 1rem; background: var(--c-card); border-radius: 1rem; color: var(--c-green); font-weight: 900; border: 2px solid var(--c-slate-700); width: 100%; overflow: hidden; display: flex; justify-content: center; align-items: center; }
.matric-actions { display: flex; flex-direction: column; justify-content: center; gap: 0.75rem; padding-top: 0.5rem; }
.matric-challenge { background: var(--c-card); border-bottom: 4px solid var(--c-green); border-radius: 1.5rem; padding: 1.25rem; display: flex; flex-direction: column; gap: 1.5rem; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); }
.level-badge { font-size: 10px; padding: 0.125rem 0.625rem; border-radius: 9999px; color: #fff; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; }
.level-knowledge { background: var(--c-blue); box-shadow: 0 2px 0 var(--c-blue-dark); }
.level-routine { background: var(--c-amber); box-shadow: 0 2px 0 var(--c-amber-dark); }
.level-complex { background: var(--c-red); box-shadow: 0 2px 0 var(--c-red-dark); }
.level-problem { background: #7C3AED; box-shadow: 0 2px 0 #6D28D9; }
.challenge-source { font-size: 10px; font-weight: 900; color: var(--c-slate-400); text-transform: uppercase; letter-spacing: 0.05em; }
.ladder-progress { margin-top: 1.25rem; padding-top: 1.25rem; border-top: 2px solid var(--c-slate-700); }
.ladder-meta { display: flex; justify-content: space-between; font-size: 10px; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; color: var(--c-slate-400); margin-bottom: 0.5rem; }
.ladder-track { height: 0.75rem; background: var(--c-app); border-radius: 9999px; border: 2px solid var(--c-slate-700); overflow: hidden; }
.ladder-fill { height: 100%; background: linear-gradient(to right, var(--c-green), var(--c-emerald)); border-radius: 9999px; transition: width 0.3s ease; }

/* ============================================================
   PRACTICE SANDBOX
   ============================================================ */
.practice { display: flex; flex-direction: column; gap: 1.5rem; }
.practice-head {
  background: var(--c-card); border-bottom: 4px solid var(--c-blue); border-radius: 1.5rem; padding: 1.25rem;
  position: relative; overflow: hidden; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}
.practice-head-top { display: flex; flex-direction: column; align-items: flex-start; justify-content: space-between; gap: 1rem; }
.practice-icon {
  width: 3rem; height: 3rem; border-radius: 1rem; background: var(--c-blue); color: #fff; display: flex;
  align-items: center; justify-content: center; font-size: 1.5rem; box-shadow: 0 4px 0 var(--c-blue-dark); flex-shrink: 0;
}
.practice-title { font-size: 1.125rem; font-weight: 900; color: #fff; text-transform: uppercase; letter-spacing: -0.025em; margin: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }
.practice-badge { font-size: 10px; padding: 0.125rem 0.625rem; border-radius: 9999px; background: var(--c-green); color: #fff; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; box-shadow: 0 2px 0 var(--c-green-dark); }
.practice-sub { font-size: 0.75rem; color: var(--c-slate-400); font-weight: 500; margin-top: 0.25rem; }
.filter-pills { margin-top: 1.5rem; padding-top: 1.5rem; border-top: 2px solid var(--c-slate-700); display: flex; gap: 0.5rem; overflow-x: auto; padding-bottom: 0.5rem; touch-action: pan-x; }
.filter-pill {
  min-height: 44px; padding: 0.5rem 0.875rem; border-radius: 0.75rem; font-size: 0.75rem; font-weight: 900;
  text-transform: uppercase; letter-spacing: 0.05em; white-space: nowrap; transition: all 0.15s ease; touch-action: manipulation;
  background: var(--c-app); color: var(--c-slate-400); border: 2px solid var(--c-slate-700);
}
.filter-pill:hover { color: #fff; }
.filter-pill-active { background: var(--c-blue); color: #fff; box-shadow: 0 3px 0 var(--c-blue-dark); }

.practice-grid { display: grid; grid-template-columns: 1fr; gap: 1.5rem; align-items: start; }
.practice-left { background: var(--c-card); border-bottom: 4px solid var(--c-blue); border-radius: 1.5rem; padding: 1.25rem; display: flex; flex-direction: column; gap: 1.5rem; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); }
.practice-top { display: flex; align-items: center; justify-content: space-between; padding-bottom: 0.75rem; border-bottom: 2px solid var(--c-slate-700); }
.practice-rule { font-size: 10px; font-weight: 900; color: #fff; background: var(--c-blue); padding: 0.25rem 0.75rem; border-radius: 9999px; text-transform: uppercase; letter-spacing: 0.05em; box-shadow: 0 2px 0 var(--c-blue-dark); }
.refresh-btn { min-height: 44px; min-width: 44px; padding: 0.5rem; color: var(--c-slate-400); background: var(--c-panel); border-radius: 0.75rem; display: flex; align-items: center; justify-content: center; transition: all 0.15s ease; touch-action: manipulation; }
.refresh-btn:hover { color: #fff; background: var(--c-panel2); }
.practice-question { text-align: center; padding: 1.25rem 0.75rem; background: var(--c-app); border-radius: 1rem; border: 2px solid var(--c-slate-700); overflow: hidden; }
.practice-question .pq-math { font-size: 1.5rem; font-weight: 900; color: #fff; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.practice-question .pq-hint { font-size: 0.75rem; color: var(--c-slate-400); font-weight: 700; margin-top: 0.5rem; text-transform: uppercase; letter-spacing: 0.025em; }
.practice-opt-grid { display: grid; grid-template-columns: 1fr; gap: 0.75rem; }
.practice-opt {
  min-height: 52px; padding: 1rem; border-radius: 1rem; border: 2px solid; font-weight: 900; font-size: 1rem;
  transition: all 0.15s ease; display: flex; align-items: center; justify-content: space-between; touch-action: manipulation;
  overflow: hidden; background: var(--c-app); color: #fff; border-color: var(--c-slate-700); box-shadow: 0 3px 0 var(--c-app);
}
.practice-opt:hover { background: var(--c-panel); transform: translateY(0.125rem); }
.practice-opt:active { transform: translateY(0.25rem); }
.practice-opt.correct { background: var(--c-green); border-color: var(--c-green-deep); font-weight: 900; box-shadow: 0 4px 0 var(--c-green-dark); }
.practice-opt.wrong { background: var(--c-rose); border-color: var(--c-rose-dark); font-weight: 900; text-decoration: line-through; box-shadow: 0 4px 0 var(--c-rose-deep); }
.practice-opt.dim { background: var(--c-app); border-color: var(--c-slate-700); color: var(--c-slate-500); opacity: 0.5; }
.practice-opt .opt-inner { overflow: hidden; width: 85%; flex: 1; padding-right: 0.25rem; display: flex; align-items: center; }
.practice-explain { padding: 1rem; border-radius: 1rem; border: 2px solid; font-size: 0.75rem; line-height: 1.625; display: flex; flex-direction: column; gap: 0.5rem; animation: fadeIn 0.3s ease-out; }
.practice-explain.ok { background: rgba(16,185,129,0.2); border-color: var(--c-green); color: var(--c-green); }
.practice-explain.no { background: rgba(239,68,68,0.2); border-color: var(--c-rose); color: var(--c-rose); }
.practice-right { display: flex; flex-direction: column; gap: 1rem; }

/* ============================================================
   STORY MODE
   ============================================================ */
.story { display: flex; flex-direction: column; gap: 1.5rem; }
.story-head {
  background: var(--c-card); border-bottom: 4px solid var(--c-blue); border-radius: 1.5rem; padding: 1.5rem;
  position: relative; overflow: hidden; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}
.story-head-top { display: flex; flex-direction: column; align-items: flex-start; justify-content: space-between; gap: 1rem; }
.story-icon {
  width: 3.5rem; height: 3.5rem; border-radius: 1rem; background: var(--c-blue); color: #fff; display: flex;
  align-items: center; justify-content: center; font-size: 1.875rem; box-shadow: 0 4px 0 var(--c-blue-dark); flex-shrink: 0;
}
.story-title { font-size: 1.25rem; font-weight: 900; color: #fff; text-transform: uppercase; letter-spacing: -0.025em; margin: 0; display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.story-badge { font-size: 10px; padding: 0.125rem 0.625rem; border-radius: 9999px; background: var(--c-blue); color: #fff; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; box-shadow: 0 2px 0 var(--c-blue-dark); }
.story-sub { font-size: 0.75rem; color: var(--c-slate-400); font-weight: 500; margin-top: 0.25rem; }

.chapter-grid { display: grid; grid-template-columns: 1fr; gap: 1.25rem; }
.chapter {
  padding: 1.5rem; border-radius: 1.5rem; position: relative; overflow: hidden; display: flex; flex-direction: column;
  justify-content: space-between; box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  background: var(--c-card); border-bottom: 4px solid var(--c-blue); transition: all 0.15s ease;
}
.chapter:hover { background: rgba(51,65,85,0.6); }
.chapter.locked { background: var(--c-app); border: 2px solid var(--c-slate-700); opacity: 0.6; }
.chapter-tag { position: absolute; top: 1rem; right: 1rem; display: flex; align-items: center; gap: 0.25rem; font-size: 10px; font-weight: 900; padding: 0.25rem 0.625rem; border-radius: 9999px; text-transform: uppercase; }
.chapter-tag.done { color: var(--c-green); background: rgba(16,185,129,0.2); border: 1px solid rgba(16,185,129,0.4); }
.chapter-tag.locked-tag { color: var(--c-slate-400); background: var(--c-panel); }
.chapter-num { font-size: 10px; font-weight: 900; text-transform: uppercase; letter-spacing: 0.1em; padding: 0.125rem 0.625rem; border-radius: 9999px; background: var(--c-blue); color: #fff; box-shadow: 0 2px 0 var(--c-blue-dark); }
.chapter-grade { font-size: 0.75rem; font-weight: 700; color: var(--c-slate-400); display: flex; align-items: center; gap: 0.25rem; }
.chapter-title { font-size: 1.125rem; font-weight: 900; color: #fff; text-transform: uppercase; margin: 0.25rem 0; }
.chapter-subtitle { font-size: 0.75rem; color: var(--c-sky); font-weight: 700; margin-bottom: 0.5rem; }
.chapter-desc { font-size: 0.75rem; color: var(--c-slate-400); font-weight: 500; line-height: 1.625; margin-bottom: 1rem; }
.chapter-focus { background: var(--c-app); padding: 0.875rem; border-radius: 1rem; border: 2px solid var(--c-slate-700); margin-bottom: 1rem; font-size: 0.75rem; color: var(--c-slate-300); }
.chapter-focus .cf-label { color: var(--c-slate-400); font-weight: 900; text-transform: uppercase; font-size: 10px; display: block; margin-bottom: 0.125rem; }
.chapter-focus .cf-value { color: var(--c-yellow); font-family: var(--font-mono); font-weight: 700; }
.chapter-foot { padding-top: 1rem; border-top: 2px solid var(--c-slate-700); display: flex; align-items: center; justify-content: space-between; }
.chapter-target { font-size: 0.75rem; color: var(--c-slate-400); font-family: var(--font-mono); }
.chapter-target strong { color: var(--c-yellow); font-weight: 900; }
.chapter-btn {
  min-height: 44px; padding: 0.625rem 1rem; background: var(--c-blue); color: #fff; border-radius: 0.75rem; font-size: 0.75rem;
  font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; box-shadow: 0 4px 0 var(--c-blue-dark);
  display: inline-flex; align-items: center; gap: 0.375rem; transition: all 0.15s ease; touch-action: manipulation;
}
.chapter-btn:hover { background: var(--c-blue-deep); transform: translateY(0.125rem); }
.chapter-btn:active { box-shadow: none; }
.chapter-btn-locked { background: var(--c-panel); color: var(--c-slate-500); box-shadow: none; cursor: not-allowed; }
.chapter-btn-locked:hover { background: var(--c-panel); transform: none; }

/* ============================================================
   LEADERBOARD
   ============================================================ */
.lb { display: flex; flex-direction: column; gap: 1.5rem; }
.lb-head {
  background: var(--c-card); border-bottom: 4px solid var(--c-yellow); border-radius: 1.5rem; padding: 1.5rem;
  position: relative; overflow: hidden; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}
.lb-head-top { display: flex; flex-direction: column; align-items: flex-start; justify-content: space-between; gap: 1rem; }
.lb-icon {
  width: 3.5rem; height: 3.5rem; border-radius: 1rem; background: var(--c-yellow); color: var(--c-yellow-text);
  display: flex; align-items: center; justify-content: center; font-size: 1.875rem; box-shadow: 0 4px 0 var(--c-yellow-dark); flex-shrink: 0;
}
.lb-title { font-size: 1.25rem; font-weight: 900; color: #fff; text-transform: uppercase; letter-spacing: -0.025em; margin: 0; display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.lb-badge { font-size: 10px; padding: 0.125rem 0.625rem; border-radius: 9999px; background: var(--c-green); color: #fff; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; box-shadow: 0 2px 0 var(--c-green-dark); }
.lb-sub { font-size: 0.75rem; color: var(--c-slate-400); font-weight: 500; margin-top: 0.25rem; }
.lb-filters { margin-top: 1.5rem; padding-top: 1.5rem; border-top: 2px solid var(--c-slate-700); display: grid; grid-template-columns: 1fr; gap: 1rem; }
.filter-label { font-size: 11px; font-weight: 900; color: var(--c-slate-400); text-transform: uppercase; letter-spacing: 0.05em; display: flex; align-items: center; gap: 0.375rem; margin-bottom: 0.375rem; }
.select {
  width: 100%; background: var(--c-app); border: 2px solid var(--c-slate-700); color: #fff; font-size: 0.75rem;
  font-weight: 700; border-radius: 1rem; padding: 0.75rem; outline: none; appearance: auto;
}
.select:focus { border-color: var(--c-blue); }

.lb-podium { display: grid; grid-template-columns: 1fr; gap: 1.25rem; padding-top: 0.5rem; }
.podium-card { background: var(--c-card); border-radius: 1.5rem; padding: 1.5rem; display: flex; flex-direction: column; align-items: center; text-align: center; position: relative; box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1); }
.podium-2 { border-bottom: 4px solid var(--c-blue); order: 2; }
.podium-1 { border-bottom: 6px solid var(--c-yellow); order: 1; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); transform: scale(1.05); }
.podium-3 { border-bottom: 4px solid var(--c-amber); order: 3; }
.podium-medal { width: 3rem; height: 3rem; border-radius: 1rem; display: flex; align-items: center; justify-content: center; font-size: 1.25rem; font-weight: 900; color: #fff; margin-bottom: 0.5rem; }
.podium-medal-1 { width: 3.5rem; height: 3.5rem; font-size: 1.5rem; background: var(--c-yellow); color: var(--c-yellow-text); box-shadow: 0 4px 0 var(--c-yellow-dark); }
.podium-medal-2 { background: var(--c-blue); box-shadow: 0 3px 0 var(--c-blue-dark); }
.podium-medal-3 { background: var(--c-amber); box-shadow: 0 3px 0 var(--c-amber-dark); }
.podium-name { font-weight: 900; color: #fff; font-size: 0.875rem; text-transform: uppercase; }
.podium-school { font-size: 0.75rem; color: var(--c-slate-400); font-weight: 700; display: flex; align-items: center; gap: 0.25rem; margin-top: 0.125rem; }
.podium-score { margin-top: 0.75rem; padding: 0.375rem 0.875rem; background: var(--c-app); border: 2px solid var(--c-slate-700); border-radius: 0.75rem; font-size: 0.75rem; font-family: var(--font-mono); font-weight: 900; color: var(--c-sky); }
.podium-1 .podium-score { border-color: var(--c-yellow); color: var(--c-yellow); font-size: 0.875rem; }
.podium-3 .podium-score { color: var(--c-yellow); }
.champion-tag { font-size: 10px; font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; color: var(--c-yellow-text); background: var(--c-yellow); padding: 0.125rem 0.75rem; border-radius: 9999px; margin-bottom: 0.25rem; box-shadow: 0 1px 2px rgba(0,0,0,0.05); }

.lb-table-wrap { background: var(--c-card); border-bottom: 4px solid var(--c-blue); border-radius: 1.5rem; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); overflow: hidden; }
.lb-table-scroll { overflow-x: auto; }
.lb-table { width: 100%; text-align: left; font-size: 0.75rem; color: #fff; border-collapse: collapse; }
.lb-table thead { background: var(--c-app); color: var(--c-slate-400); text-transform: uppercase; letter-spacing: 0.05em; font-weight: 900; }
.lb-table thead th { padding: 1rem; border-bottom: 2px solid var(--c-slate-700); }
.lb-table tbody tr { border-bottom: 1px solid var(--c-slate-700); background: var(--c-card); transition: background-color 0.15s ease; }
.lb-table tbody tr:hover { background: rgba(51,65,85,0.5); }
.lb-table tbody tr.you { background: rgba(59,130,246,0.2); border-left: 4px solid var(--c-blue); }
.lb-table td { padding: 1rem; }
.lb-rank { text-align: center; font-family: var(--font-mono); font-weight: 900; width: 4rem; }
.lb-name { font-weight: 900; color: #fff; display: flex; align-items: center; gap: 0.375rem; }
.lb-you-tag { font-size: 10px; background: var(--c-blue); color: #fff; padding: 0.125rem 0.5rem; border-radius: 9999px; font-weight: 900; text-transform: uppercase; }
.lb-school { font-size: 11px; color: var(--c-slate-400); font-weight: 700; display: flex; align-items: center; gap: 0.25rem; margin-top: 0.125rem; }
.lb-province { padding: 0.25rem 0.625rem; border-radius: 9999px; background: var(--c-app); border: 1px solid var(--c-slate-700); color: var(--c-slate-300); font-size: 11px; font-weight: 700; white-space: nowrap; }
.lb-grade { text-align: center; font-weight: 700; }
.lb-level { text-align: center; }
.lb-level .lvl { padding: 0.25rem 0.625rem; border-radius: 0.5rem; background: rgba(59,130,246,0.2); color: var(--c-sky); font-family: var(--font-mono); font-weight: 900; border: 1px solid rgba(59,130,246,0.3); }
.lb-badges { text-align: center; font-family: var(--font-mono); color: var(--c-yellow); font-weight: 900; }
.lb-score { text-align: right; font-family: var(--font-mono); font-weight: 900; color: var(--c-yellow); font-size: 0.875rem; }

/* ============================================================
   MODALS
   ============================================================ */
.overlay {
  position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center;
  padding: 1rem; background: rgba(2,6,23,0.85); backdrop-filter: blur(4px); animation: fadeIn 0.2s ease-out;
}
.modal {
  background: var(--c-card); width: 100%; max-width: 56rem; border-radius: 1.5rem; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
  overflow: hidden; max-height: 90vh; display: flex; flex-direction: column;
}
.modal-blue { border-bottom: 6px solid var(--c-blue); }
.modal-yellow { border-bottom: 6px solid var(--c-yellow); }
.modal-lg { max-width: 32rem; }
.modal-md { max-width: 28rem; }
.modal-head { background: var(--c-app); padding: 1rem 1.5rem; border-bottom: 2px solid var(--c-slate-700); display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; }
.modal-head-left { display: flex; align-items: center; gap: 0.75rem; }
.modal-icon {
  width: 2.5rem; height: 2.5rem; border-radius: 1rem; color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 1.25rem; flex-shrink: 0;
}
.modal-icon-blue { background: var(--c-blue); box-shadow: 0 3px 0 var(--c-blue-dark); }
.modal-icon-yellow { background: var(--c-yellow); color: var(--c-yellow-text); box-shadow: 0 3px 0 var(--c-yellow-dark); }
.modal-head h2 { margin: 0; font-size: 1rem; font-weight: 900; color: #fff; text-transform: uppercase; letter-spacing: -0.025em; display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }
.modal-head p { margin: 0.25rem 0 0; font-size: 0.75rem; color: var(--c-slate-400); font-weight: 500; }
.modal-close { min-height: 44px; min-width: 44px; padding: 0.5rem; border-radius: 0.75rem; color: var(--c-slate-400); background: var(--c-panel); display: flex; align-items: center; justify-content: center; transition: all 0.15s ease; touch-action: manipulation; }
.modal-close:hover { color: #fff; background: var(--c-panel2); }
.modal-body { padding: 1rem 1.5rem; overflow-y: auto; display: flex; flex-direction: column; gap: 1.5rem; background: var(--c-app); font-size: 0.875rem; color: #fff; }
.modal-foot { background: var(--c-app); padding: 1rem 1.5rem; border-top: 2px solid var(--c-slate-700); display: flex; justify-content: flex-end; gap: 0.75rem; }

.modal-tabs { display: flex; border-bottom: 2px solid var(--c-slate-700); background: var(--c-app); padding: 0.625rem 1.5rem; gap: 0.5rem; overflow-x: auto; touch-action: pan-x; }
.modal-tab {
  min-height: 44px; padding: 0.5rem 1rem; border-radius: 0.75rem; font-size: 0.75rem; font-weight: 900;
  text-transform: uppercase; letter-spacing: 0.05em; white-space: nowrap; transition: all 0.15s ease; touch-action: manipulation;
  color: var(--c-slate-400); background: var(--c-card); border: 1px solid var(--c-slate-700);
}
.modal-tab:hover { color: #fff; background: var(--c-panel); }
.modal-tab-active { background: var(--c-blue); color: #fff; box-shadow: 0 3px 0 var(--c-blue-dark); }

.formula-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.fc { background: var(--c-card); padding: 1.25rem; border-radius: 1rem; border: 2px solid var(--c-slate-700); box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
.fc h4 { margin: 0 0 0.5rem; font-weight: 900; text-transform: uppercase; display: flex; align-items: center; gap: 0.5rem; }
.fc .fc-row { font-weight: 700; font-size: 0.875rem; color: var(--c-slate-300); margin: 0.25rem 0; }
.fc .fc-note { font-size: 0.75rem; color: var(--c-slate-400); font-weight: 500; line-height: 1.625; }
.fc .fc-note strong { color: #fff; }
.neg-grid { display: grid; grid-template-columns: 1fr; gap: 0.5rem; }
.neg-cell { padding: 0.75rem; background: var(--c-app); border: 1px solid var(--c-slate-700); border-radius: 0.75rem; font-weight: 700; }
.specials-wrap { overflow-x: auto; border-radius: 1rem; border: 2px solid var(--c-slate-700); touch-action: pan-x; }
.specials-table { width: 100%; text-align: left; border-collapse: collapse; font-size: 0.75rem; }
.specials-table thead { background: var(--c-app); color: var(--c-slate-400); border-bottom: 2px solid var(--c-slate-700); font-weight: 900; text-transform: uppercase; }
.specials-table thead th { padding: 0.875rem; }
.specials-table tbody { background: var(--c-card); font-weight: 700; color: #fff; }
.specials-table tbody td { padding: 0.875rem; border-top: 1px solid var(--c-slate-700); }

/* Badge modal */
.progress-wrap { background: var(--c-app); padding: 0.875rem 1.5rem; border-bottom: 2px solid var(--c-slate-700); display: flex; align-items: center; gap: 1rem; }
.progress-track { flex: 1; background: var(--c-card); height: 0.75rem; border-radius: 9999px; overflow: hidden; border: 1px solid var(--c-slate-700); }
.progress-fill { background: var(--c-yellow); height: 100%; border-radius: 9999px; box-shadow: 0 0 10px #FDE047; transition: width 0.5s; }
.progress-pct { font-size: 0.75rem; font-family: var(--font-mono); font-weight: 900; color: var(--c-yellow); }
.badge-grid { padding: 1.5rem; overflow-y: auto; display: grid; grid-template-columns: 1fr; gap: 1rem; background: var(--c-app); min-height: 0; }
.badge-card {
  padding: 1.25rem; border-radius: 1.5rem; position: relative; display: flex; flex-direction: column;
  justify-content: space-between; background: var(--c-card); border-bottom: 4px solid var(--c-yellow); box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
}
.badge-card.locked { background: var(--c-app); border: 2px solid var(--c-slate-700); opacity: 0.5; }
.badge-card-top { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; margin-bottom: 0.75rem; }
.badge-icon {
  width: 3rem; height: 3rem; border-radius: 1rem; display: flex; align-items: center; justify-content: center; font-size: 1.5rem;
  line-height: 1; flex-shrink: 0; background: var(--c-yellow); color: var(--c-yellow-text); box-shadow: 0 3px 0 var(--c-yellow-dark);
}
.badge-card.locked .badge-icon { background: var(--c-panel); color: var(--c-slate-500); box-shadow: none; }
.badge-state { display: flex; align-items: center; gap: 0.25rem; font-size: 10px; font-weight: 900; padding: 0.25rem 0.625rem; border-radius: 9999px; text-transform: uppercase; }
.badge-state.unlocked { color: var(--c-green); background: rgba(16,185,129,0.2); border: 1px solid rgba(16,185,129,0.4); }
.badge-state.locked-state { color: var(--c-slate-400); background: var(--c-panel); }
.badge-card h4 { margin: 0 0 0.25rem; font-weight: 900; color: #fff; font-size: 0.875rem; text-transform: uppercase; }
.badge-card p { margin: 0 0 0.75rem; font-size: 0.75rem; color: var(--c-slate-400); font-weight: 500; line-height: 1.625; }
.badge-goal { padding-top: 0.75rem; border-top: 2px solid var(--c-slate-700); display: flex; align-items: center; justify-content: space-between; font-size: 10px; color: var(--c-slate-400); }
.badge-goal .goal-label { font-weight: 900; text-transform: uppercase; }
.badge-goal .goal-value { font-family: var(--font-mono); font-weight: 700; color: var(--c-yellow); }

/* Profile modal */
.auth-card { padding: 1rem; border-radius: 1rem; background: var(--c-card); border: 2px solid var(--c-slate-700); display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.auth-card .auth-label { font-size: 10px; font-weight: 900; color: var(--c-slate-400); text-transform: uppercase; letter-spacing: 0.05em; display: block; }
.auth-card .auth-status { font-size: 0.875rem; font-weight: 900; color: #fff; }
.auth-card .auth-note { font-size: 11px; color: var(--c-slate-400); font-weight: 500; margin-top: 0.125rem; }
.sign-btn {
  padding: 0.5rem 1rem; border-radius: 0.75rem; font-weight: 900; text-transform: uppercase; font-size: 11px;
  display: flex; align-items: center; gap: 0.25rem; transition: all 0.15s ease; touch-action: manipulation; flex-shrink: 0;
}
.sign-btn-in { background: var(--c-blue); color: #fff; box-shadow: 0 3px 0 var(--c-blue-dark); }
.sign-btn-in:hover { background: var(--c-blue-deep); }
.sign-btn-out { background: var(--c-rose); color: #fff; box-shadow: 0 3px 0 var(--c-rose-deep); }
.sign-btn-out:hover { background: var(--c-rose-dark); }
.sign-btn:disabled { opacity: 0.6; }
.label { display: block; color: var(--c-slate-400); font-weight: 900; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.25rem; font-size: 11px; }
.label-row { display: flex; align-items: center; gap: 0.25rem; }
.input, .select-form {
  width: 100%; background: var(--c-card); border: 2px solid var(--c-slate-700); color: #fff; font-weight: 700;
  border-radius: 1rem; padding: 0.75rem; outline: none; font-size: 0.75rem;
}
.input:focus, .select-form:focus { border-color: var(--c-blue); }
.form-grid-2 { display: grid; grid-template-columns: 1fr; gap: 0.75rem; }
.stats-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 0.625rem; text-align: center; padding-top: 1rem; border-top: 2px solid var(--c-slate-700); }
.stat-box { background: var(--c-card); border: 2px solid var(--c-slate-700); padding: 0.625rem; border-radius: 1rem; }
.stat-box .sl { font-size: 9px; color: var(--c-slate-400); text-transform: uppercase; font-weight: 900; }
.stat-box .sv { font-size: 0.875rem; font-family: var(--font-mono); font-weight: 900; }

/* Game-over modal */
.gameover-overlay { padding: 1rem; }
.gameover-card { background: var(--c-slate-900); border: 1px solid var(--c-slate-700); width: 100%; max-width: 28rem; border-radius: 1.5rem; padding: 1.5rem; text-align: center; display: flex; flex-direction: column; gap: 1.5rem; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25); }
.gameover-icon {
  width: 4rem; height: 4rem; border-radius: 1rem; background: linear-gradient(to top right, var(--c-indigo), var(--c-emerald));
  display: flex; align-items: center; justify-content: center; font-size: 1.875rem; margin: 0 auto; box-shadow: 0 10px 15px -3px rgba(99,102,241,0.2);
}
.gameover-title { font-size: 1.5rem; font-weight: 900; color: #fff; margin: 0; }
.gameover-sub { font-size: 0.75rem; color: var(--c-slate-400); margin-top: 0.25rem; }
.result-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 0.75rem; }
.result-box { background: var(--c-slate-950); padding: 0.75rem; border-radius: 0.75rem; border: 1px solid var(--c-slate-800); }
.result-box .rl { font-size: 10px; color: var(--c-slate-500); text-transform: uppercase; font-weight: 600; display: block; }
.result-box .rv { font-size: 1.25rem; font-family: var(--font-mono); font-weight: 900; color: var(--c-amber); }
.result-box.acc .rv { color: var(--c-emerald); }
.newbadges { padding: 1rem; background: linear-gradient(to right, rgba(120,53,15,0.4), var(--c-slate-950), rgba(120,53,15,0.4)); border: 1px solid rgba(245,158,11,0.4); border-radius: 1rem; display: flex; flex-direction: column; gap: 0.5rem; }
.newbadges-label { font-size: 11px; font-weight: 700; color: #fcd34d; display: flex; align-items: center; justify-content: center; gap: 0.25rem; }
.newbadges-row { display: flex; justify-content: center; gap: 0.5rem; flex-wrap: wrap; }
.badge-pill { padding: 0.25rem 0.625rem; background: rgba(245,158,11,0.2); color: #fcd34d; border-radius: 0.5rem; font-size: 0.75rem; font-weight: 700; font-family: var(--font-mono); }
.gameover-continue { width: 100%; padding: 0.75rem; background: #4F46E5; color: #fff; border-radius: 0.75rem; font-size: 0.75rem; font-weight: 700; box-shadow: 0 10px 15px -3px rgba(79,70,229,0.3); transition: all 0.15s ease; }
.gameover-continue:hover { background: #6366F1; }
.result-box.ok .rv { color: var(--c-green); }
.result-box.bad .rv { color: var(--c-red); }
.gameover-actions { display: flex; flex-direction: column; gap: 0.625rem; }
.gameover-play {
  width: 100%; padding: 0.75rem; background: var(--c-green); color: #fff; border-radius: 0.75rem;
  font-size: 0.75rem; font-weight: 700; box-shadow: 0 4px 0 var(--c-green-dark); transition: all 0.15s ease;
  display: flex; align-items: center; justify-content: center; gap: 0.375rem;
}
.gameover-play:hover { background: var(--c-green-deep); transform: translateY(0.125rem); }
.gameover-play:active { box-shadow: none; transform: translateY(0.25rem); }
.gameover-menu {
  width: 100%; padding: 0.75rem; background: var(--c-panel); color: #fff; border-radius: 0.75rem;
  font-size: 0.75rem; font-weight: 700; border: 2px solid var(--c-slate-600); box-shadow: 0 3px 0 var(--c-slate-800);
  transition: all 0.15s ease; display: flex; align-items: center; justify-content: center;
}
.gameover-menu:hover { background: var(--c-panel2); }
.gameover-menu:active { background: var(--c-slate-800); }

/* ============================================================
   RESPONSIVE BREAKPOINTS
   ============================================================ */
@media (max-width: 639px) {
  .nav-inner { flex-wrap: wrap; row-gap: 0.5rem; }
  .nav-actions { flex: 1 1 100%; justify-content: space-between; }
  .nav-brand { flex: 1 1 auto; min-width: 0; }

  .modal-head { padding: 0.875rem 1rem; }
  .modal-head h2 { font-size: 0.875rem; }
  .modal-foot { padding: 0.875rem 1rem; }
  .progress-wrap { padding: 0.75rem 1rem; }
  .badge-grid { padding: 1rem; gap: 0.75rem; }
  .badge-card { padding: 1rem; }
}

@media (max-width: 339px) {
  .cast { padding: 1rem; }
  .cast-circle { width: 13rem; height: 13rem; }
  .quad { width: 5.5rem; height: 5.5rem; }
  .quad-letter { font-size: 1.25rem; }
}

@media (min-width: 640px) {
  .main { padding: 1.5rem; }
  .hero { padding: 2.5rem; }
  .hero-title { font-size: 3rem; }
  .hero-desc { font-size: 1rem; }
  .option-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .step-opt-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .practice-opt-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .formula-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .neg-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .badge-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .form-grid-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .mode-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .lb-filters { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .nav-btn .btn-label { display: inline; }
  .practice-head-top, .matric-head-top, .story-head-top, .lb-head-top { flex-direction: row; align-items: center; }
  .ws-head { flex-direction: row; align-items: center; }
  .matric-title, .practice-title, .story-title, .lb-title { font-size: 1.25rem; }
  .question-card { padding: 2rem; }
  .step-panel { padding: 1.5rem; }
  .workspace, .practice-left, .matric-head, .practice-head { padding: 1.5rem; }
  .eval-box { flex-direction: row; align-items: center; }
  .modal-body { padding: 1.5rem; }
  .matric-actions { flex-direction: row; }
}

@media (min-width: 768px) {
  .nav-stats { display: flex; }
  .nav-profile-meta { display: block; }
  .chapter-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .lb-podium { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .podium-1 { order: 2; }
  .podium-2 { order: 1; }
  .podium-3 { order: 3; }
  .cast-body { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .badge-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
}

@media (min-width: 1024px) {
  .mode-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
  .dash-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .hero-side { display: block; position: absolute; right: 2rem; top: 50%; transform: translateY(-50%); text-align: right; }
  .dash-col2 { grid-column: span 2; }
}