/* ============================================================
   ElementQuest — Periodic Table Game
   Stylesheet: style.css
   ============================================================ */

*,*::before,*::after {

box-sizing:border-box;
  margin:0;
  padding:0;
  -webkit-tap-highlight-color:transparent}

/* ── Design Tokens / CSS Variables ── */
:root {

--bg:#040d1a;
  --bg2:#071428;
  --bg3:#0a1d3a;

  --panel:rgba(10,25,60,.9);
  --glass:rgba(0,200,255,.05);
  --border:rgba(0,200,255,.18);

  --cyan:#00e5ff;
  --cyan2:#00bcd4;
  --gold:#ffd740;
  --gold2:#ff9800;

  --green:#00e676;
  --red:#ff1744;
  --purple:#d500f9;

  --white:#e8f4f8;
  --dim:#8ab0c8;

  --r:14px;
  --rs:8px;
  --shadow:0 8px 32px rgba(0,200,255,.15);

  --font:'Segoe UI',system-ui,sans-serif
}
html {

font-family:var(--font);
  background:var(--bg);
  color:var(--white);
  height:100%;
  overflow-x:hidden}
body {

min-height:100vh;
  overflow-x:hidden}

/* ── Scrollbar Styling ── */
::-webkit-scrollbar {

width:5px}
::-webkit-scrollbar-track {

background:var(--bg2)}
::-webkit-scrollbar-thumb {

background:var(--cyan2);
  border-radius:3px}
#stars {

position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  overflow:hidden}
.star {

position:absolute;
  border-radius:50%;
  background:#fff;
  animation:twinkle var(--d,3s) infinite ease-in-out;
  opacity:0}

/* ── Animations ── */
@keyframes twinkle {

0%,100% {

opacity:0;
  transform:scale(.5)}
50% {

opacity:var(--op,.8);
  transform:scale(1)}
}
.screen {

display:none;
  flex-direction:column;
  align-items:center;
  min-height:100vh;
  position:relative;
  z-index:10;
  padding:16px}
.screen.active {

display:flex}
#scr-splash {

justify-content:center;
  background:radial-gradient(ellipse at 50% 40%,#0a2040,var(--bg) 70%)}
.splash-logo {

text-align:center;
  animation:logoIn .8s ease-out}
@keyframes logoIn {

from {

opacity:0;
  transform:scale(.7) translateY(40px)}
to {

opacity:1;
  transform:none}
}
.splash-logo h1 {

font-size:clamp(2.2rem,10vw,5rem);
  font-weight:900;
  letter-spacing:-2px;

  background:linear-gradient(135deg,var(--cyan),var(--gold));
  -webkit-background-clip:text;

  -webkit-text-fill-color:transparent;
  background-clip:text;
  filter:drop-shadow(0 0 30px rgba(0,229,255,.5))}
.tagline {

color:var(--dim);
  font-size:.95rem;
  margin-top:8px;
  letter-spacing:3px;
  text-transform:uppercase}
.atom-ring {

width:110px;
  height:110px;
  border-radius:50%;
  border:2px solid var(--cyan);
  margin:22px auto;

  position:relative;
  animation:spin 4s linear infinite;

  box-shadow:0 0 20px var(--cyan),inset 0 0 20px rgba(0,229,255,.1)}
.atom-ring::before {

content:'\269B';
  position:absolute;
  top:50%;
  left:50%;
  transform:translate(-50%,-50%);

  font-size:2.8rem;
  animation:spin 4s linear infinite reverse;
  filter:drop-shadow(0 0 10px var(--cyan))}
@keyframes spin {

to {

transform:rotate(360deg)}
}
.atom-ring::after {

content:'';
  position:absolute;
  inset:0;
  border-radius:50%;
  border:2px solid var(--gold);

  transform:rotate(60deg);
  box-shadow:0 0 10px var(--gold)}
.splash-bar {

width:180px;
  height:4px;
  background:var(--bg3);
  border-radius:2px;
  margin:22px auto 0;
  overflow:hidden}
.splash-bar-fill {

height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--gold));
  animation:loadBar 2.2s ease-in-out forwards}
@keyframes loadBar {

from {

width:0}
to {

width:100%}
}
#scr-home {

justify-content:flex-start;
  padding-top:0}
.home-hdr {

width:100%;
  background:linear-gradient(180deg,var(--bg2),transparent);

  padding:18px 20px 14px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  border-bottom:1px solid var(--border)}
.logo-sm {

font-size:1.3rem;
  font-weight:900;
  background:linear-gradient(135deg,var(--cyan),var(--gold));

  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text}
.lang-btn {

background:var(--glass);
  border:1px solid var(--border);
  color:var(--white);

  padding:5px 13px;
  border-radius:20px;
  cursor:pointer;
  font-size:.82rem;
  transition:all .2s;
  display:flex;
  align-items:center;
  gap:5px}
.lang-btn:hover {

background:rgba(0,229,255,.12);
  border-color:var(--cyan)}
.player-card {

width:100%;
  max-width:480px;
  margin:14px auto;
  background:var(--panel);

  border:1px solid var(--border);
  border-radius:var(--r);
  padding:14px 18px;

  display:flex;
  align-items:center;
  gap:14px;
  box-shadow:var(--shadow)}
.p-av {

width:52px;
  height:52px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--cyan),var(--purple));

  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1.6rem;
  flex-shrink:0}
.p-info {

flex:1;
  min-width:0}
.p-name {

font-size:1rem;
  font-weight:700;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis}
.p-stats {

display:flex;
  gap:10px;
  margin-top:4px}
.stat {

display:flex;
  align-items:center;
  gap:3px;
  font-size:.72rem;
  color:var(--dim)}
.stat span {

font-weight:700;
  color:var(--gold)}
.home-body {

width:100%;
  max-width:480px;
  padding:0 0 80px}
.sec-title {

color:var(--dim);
  font-size:.72rem;
  letter-spacing:2px;
  text-transform:uppercase;
  margin:18px 0 8px}
.mbtn {

width:100%;
  padding:14px 18px;
  background:var(--panel);
  border:1px solid var(--border);

  border-radius:var(--r);
  cursor:pointer;
  display:flex;
  align-items:center;
  gap:14px;

  transition:all .25s;
  color:var(--white);
  text-align:left;
  margin-bottom:9px;

  box-shadow:0 4px 16px rgba(0,0,0,.3);
  position:relative;
  overflow:hidden}
.mbtn::before {

content:'';
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:3px;
  background:var(--ac,var(--cyan));
  border-radius:0 2px 2px 0}
.mbtn:hover,.mbtn:active {

background:rgba(0,229,255,.08);
  border-color:var(--ac,var(--cyan));
  transform:translateX(3px)}
.mbtn .bi {

font-size:1.7rem;
  flex-shrink:0}
.mbtn .bt {

flex:1}
.mbtn .bl {

font-size:.95rem;
  font-weight:700}
.mbtn .bs {

font-size:.75rem;
  color:var(--dim);
  margin-top:1px}
.mbtn .ba {

color:var(--dim);
  font-size:1.1rem}
.page-hdr {

width:100%;
  max-width:640px;
  display:flex;
  align-items:center;
  gap:10px;

  padding:14px 18px;
  background:linear-gradient(180deg,var(--bg2),transparent);

  border-bottom:1px solid var(--border);
  position:sticky;
  top:0;
  z-index:20;
  backdrop-filter:blur(10px)}
.back-btn {

width:36px;
  height:36px;
  border-radius:50%;
  background:var(--glass);
  border:1px solid var(--border);

  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  font-size:1.2rem;
  color:var(--cyan);
  transition:all .2s;
  flex-shrink:0}
.page-title {

font-size:1.15rem;
  font-weight:800;
  flex:1}
#scr-levels {

padding-top:0}
.lvls-wrap {

width:100%;
  max-width:640px;
  padding:14px 14px 80px}
.lv-card {

width:100%;
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--r);

  margin-bottom:11px;
  overflow:hidden;
  transition:all .25s;
  cursor:pointer;
  box-shadow:0 4px 16px rgba(0,0,0,.3);
  position:relative}
.lv-card:not(.locked):hover {

transform:translateY(-3px);
  box-shadow:0 8px 28px rgba(0,229,255,.2);
  border-color:var(--lc,var(--cyan))}
.lv-card.locked {

opacity:.5;
  cursor:not-allowed}
.lv-card.locked::after {

content:'\1F512';
  position:absolute;
  right:14px;
  top:50%;
  transform:translateY(-50%);
  font-size:1.3rem}
.lv-hdr {

display:flex;
  align-items:center;
  gap:14px;
  padding:14px 18px}
.lv-badge {

width:48px;
  height:48px;
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1.4rem;
  flex-shrink:0}
.lv-info {

flex:1;
  min-width:0}
.lv-name {

font-size:.95rem;
  font-weight:800}
.lv-desc {

font-size:.75rem;
  color:var(--dim);
  margin-top:2px}
.lv-meta {

display:flex;
  gap:8px;
  margin-top:5px;
  flex-wrap:wrap;
  align-items:center}
.lv-tag {

font-size:.68rem;
  padding:2px 7px;
  border-radius:10px;
  background:var(--glass);
  border:1px solid var(--border);
  color:var(--dim)}
.lv-bar {

height:4px;
  background:var(--bg3)}
.lv-bar-fill {

height:100%;
  border-radius:2px;
  transition:width .5s}
#scr-game {

padding:0;
  background:var(--bg2);
  justify-content:flex-start}
.game-hdr {

width:100%;
  background:var(--panel);
  border-bottom:1px solid var(--border);
  padding:9px 14px;

  display:flex;
  align-items:center;
  gap:9px;
  position:sticky;
  top:0;
  z-index:20;
  backdrop-filter:blur(10px)}
.g-lives {

display:flex;
  gap:3px}
.heart {

font-size:1rem;
  transition:all .3s}
.heart.lost {

opacity:.2;
  filter:grayscale(1)}
.g-badge {

border-radius:6px;
  padding:3px 9px;
  font-size:.68rem;
  font-weight:800;
  letter-spacing:1px;
  white-space:nowrap}
.g-prog-wrap {

flex:1}
.g-qc {

font-size:.68rem;
  color:var(--dim);
  text-align:right;
  margin-bottom:2px}
.g-prog {

height:5px;
  background:var(--bg3);
  border-radius:3px;
  overflow:hidden}
.g-prog-fill {

height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--gold));
  border-radius:3px;
  transition:width .4s}
.g-score {

text-align:right;
  flex-shrink:0}
.g-score-num {

font-size:1rem;
  font-weight:900;
  color:var(--gold)}
.g-streak {

font-size:.68rem;
  color:var(--dim)}
.streak-n {

color:var(--gold2);
  font-weight:700}
.g-timer {

width:100%;
  height:5px;
  background:var(--bg3)}
.g-timer-fill {

height:100%;
  background:linear-gradient(90deg,var(--green),var(--gold),var(--red));
  background-size:200% 100%;
  transition:width 1s linear}
.g-timer-fill.urgent {

background-position:100% 50%;
  animation:urg .5s infinite}
@keyframes urg {

0%,100% {

opacity:1}
50% {

opacity:.6}
}
.g-body {
  flex:1;
  width:100%;
  max-width:640px;
  margin:0 auto;
  padding:14px 14px 44px;
  overflow-y:auto}
.qcard {

background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--r);

  padding:18px;
  margin-bottom:14px;
  text-align:center;
  box-shadow:var(--shadow);
  animation:fadeUp .4s ease-out}
@keyframes fadeUp {

from {

opacity:0;
  transform:translateY(18px)}
to {

opacity:1;
  transform:none}
}
.q-badge {

display:inline-block;
  font-size:.62rem;
  letter-spacing:2px;
  text-transform:uppercase;

  color:var(--cyan);
  background:rgba(0,229,255,.1);
  border:1px solid rgba(0,229,255,.2);
  padding:2px 9px;
  border-radius:10px;
  margin-bottom:10px}
.q-text {

font-size:clamp(.88rem,2.5vw,1.05rem);
  font-weight:600;
  line-height:1.5}
.q-el {

display:inline-block;
  margin-top:14px;
  background:linear-gradient(135deg,var(--bg3),var(--bg2));

  border:2px solid var(--cyan);
  border-radius:11px;
  padding:10px 22px;
  min-width:110px;
  box-shadow:0 0 18px rgba(0,229,255,.2)}
.q-el-n {

font-size:.68rem;
  color:var(--dim)}
.q-el-s {

font-size:2.8rem;
  font-weight:900;
  color:var(--cyan);
  line-height:1}
.q-el-m {

font-size:.68rem;
  color:var(--dim)}
.q-el-name {

font-size:.85rem;
  margin-top:3px}
.formula {

font-family:monospace;
  font-size:1.4rem;
  color:var(--cyan);
  letter-spacing:2px;
  margin:8px 0;
  text-shadow:0 0 18px rgba(0,229,255,.4)}
.opts {

display:grid;
  grid-template-columns:1fr 1fr;
  gap:9px;
  margin-top:7px}
.opts.col1 {

grid-template-columns:1fr}
.opt {

padding:13px 11px;
  background:var(--glass);
  border:1px solid var(--border);
  border-radius:var(--rs);

  cursor:pointer;
  font-size:.87rem;
  font-weight:600;
  color:var(--white);
  transition:all .2s;
  text-align:center;

  line-height:1.3;
  min-height:50px;
  display:flex;
  align-items:center;
  justify-content:center;

  -webkit-user-select:none;
  user-select:none;
  word-break:break-word}
.opt:hover {

background:rgba(0,229,255,.1);
  border-color:var(--cyan);
  transform:scale(1.02)}
.opt:active {

transform:scale(.97)}
.opt.correct {

background:rgba(0,230,118,.15)!important;
  border-color:var(--green)!important;
  color:var(--green)!important}
.opt.wrong {

background:rgba(255,23,68,.12)!important;
  border-color:var(--red)!important;
  color:var(--red)!important}
.opt:disabled {

cursor:default}

/* Symbol / formula answer options - the chemistry is the content, so scale it up */
.opts.sym .opt {

font-size:1.9rem;
  font-weight:900;
  letter-spacing:2px;
  line-height:1.1;
  min-height:70px;
  color:var(--cyan);
  text-shadow:0 0 16px rgba(0,229,255,.35)}
.opts.form .opt {

font-size:1.18rem;
  font-weight:800;
  letter-spacing:.5px;
  min-height:64px}
/* drop the cyan glow once an answer is graded (green/red take over) */
.opts.sym .opt.correct,
.opts.sym .opt.wrong {
  text-shadow:none}

/* Symbol column of the match-pairs question */
.mi.mi-sym {

font-size:1.28rem;
  font-weight:900;
  letter-spacing:1.5px;
  color:var(--cyan)}
.tf-wrap {

display:flex;
  gap:11px;
  margin-top:9px}
.tf-btn {

flex:1;
  padding:18px 11px;
  border-radius:var(--rs);
  border:2px solid var(--border);
  background:var(--glass);

  cursor:pointer;
  font-size:1.3rem;
  font-weight:900;
  transition:all .2s;
  color:var(--white);
  text-align:center}
.tf-btn.t-btn:hover {

border-color:var(--green);
  background:rgba(0,230,118,.1);
  color:var(--green)}
.tf-btn.f-btn:hover {

border-color:var(--red);
  background:rgba(255,23,68,.1);
  color:var(--red)}
.match-wrap {

display:flex;
  gap:9px;
  margin-top:9px}
.match-col {

flex:1;
  display:flex;
  flex-direction:column;
  gap:7px}
.match-col-lbl {

font-size:.62rem;
  color:var(--dim);
  text-align:center;
  margin-bottom:2px;
  letter-spacing:1px;
  text-transform:uppercase}
.mi {

padding:9px;
  border-radius:var(--rs);
  border:1px solid var(--border);
  background:var(--glass);
  cursor:pointer;

  text-align:center;
  font-size:.82rem;
  font-weight:600;
  transition:all .2s;
  -webkit-user-select:none;
  user-select:none;

  min-height:42px;
  display:flex;
  align-items:center;
  justify-content:center}
.mi:hover {

border-color:var(--cyan);
  background:rgba(0,229,255,.08)}
.mi.sel {

border-color:var(--gold);
  background:rgba(255,215,64,.1);
  color:var(--gold)}
.mi.mat {

border-color:var(--green)!important;
  background:rgba(0,230,118,.1)!important;
  color:var(--green)!important;
  cursor:default}
.mi.bad {

border-color:var(--red)!important;
  animation:shake .4s}
@keyframes shake {

0%,100% {

transform:translateX(0)}
25% {

transform:translateX(-7px)}
75% {

transform:translateX(7px)}
}
.expl {

background:rgba(0,229,255,.05);
  border:1px solid rgba(0,229,255,.15);
  border-radius:var(--rs);

  padding:11px 14px;
  margin-top:11px;
  font-size:.8rem;
  color:var(--dim);
  line-height:1.5;
  display:none;
  text-align:left}
.expl.show {

display:block;
  animation:fadeUp .3s}
.expl strong {

color:var(--cyan)}
.next-btn {

width:100%;
  padding:14px;
  margin-top:11px;
  background:linear-gradient(135deg,var(--cyan),var(--purple));

  border:none;
  border-radius:var(--r);
  color:var(--white);
  font-size:.95rem;
  font-weight:800;
  cursor:pointer;

  transition:all .2s;
  letter-spacing:1px;
  display:none}
.next-btn.show {

display:block;
  animation:fadeUp .3s}
.next-btn:hover {

box-shadow:0 6px 22px rgba(0,229,255,.4);
  transform:translateY(-2px)}
.toast {

position:fixed;
  top:78px;
  left:50%;
  transform:translateX(-50%) translateY(-18px);
  background:var(--panel);

  border:1px solid var(--border);
  border-radius:28px;
  padding:9px 22px;
  font-size:.93rem;
  font-weight:700;

  z-index:100;
  pointer-events:none;
  opacity:0;
  transition:all .3s;
  white-space:nowrap;
  max-width:90vw}
.toast.show {

opacity:1;
  transform:translateX(-50%) translateY(0)}
.toast.ok {

border-color:var(--green);
  color:var(--green)}
.toast.err {

border-color:var(--red);
  color:var(--red)}
.pts-pop {

position:fixed;
  pointer-events:none;
  z-index:200;
  font-size:1.2rem;
  font-weight:900;
  color:var(--gold);
  animation:ppop 1.2s ease-out forwards}
@keyframes ppop {

0% {

opacity:1;
  transform:translateY(0) scale(1)}
100% {

opacity:0;
  transform:translateY(-75px) scale(1.4)}
}
#scr-results {

justify-content:center}
.res-card {

width:100%;
  max-width:480px;
  text-align:center;
  background:var(--panel);
  border:1px solid var(--border);

  border-radius:var(--r);
  padding:28px 22px;
  box-shadow:var(--shadow);
  animation:fadeUp .5s}
.res-trophy {

font-size:3.8rem;
  margin-bottom:7px;
  animation:tBounce .6s ease .3s both}
@keyframes tBounce {

from {

transform:scale(0) rotate(-18deg)}
to {

transform:scale(1) rotate(0)}
}
.res-grade {

font-size:2.4rem;
  font-weight:900;
  background:linear-gradient(135deg,var(--gold),var(--gold2));

  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
  margin-bottom:7px}
.res-sub {

color:var(--dim);
  font-size:.87rem;
  margin-bottom:22px}
.res-stats {

display:grid;
  grid-template-columns:1fr 1fr;
  gap:11px;
  margin-bottom:22px}
.res-s {

background:var(--glass);
  border:1px solid var(--border);
  border-radius:var(--rs);
  padding:13px}
.res-sv {

font-size:1.7rem;
  font-weight:900;
  color:var(--cyan)}
.res-sl {

font-size:.72rem;
  color:var(--dim);
  margin-top:2px}
.res-stars {

display:flex;
  justify-content:center;
  gap:7px;
  font-size:1.9rem;
  margin-bottom:22px}
.rs.earned {

animation:sPop .4s ease backwards}
@keyframes sPop {

from {

transform:scale(0) rotate(180deg)}
to {

transform:scale(1) rotate(0)}
}
.res-btns {

display:flex;
  flex-direction:column;
  gap:9px}
.rb {

padding:13px;
  border-radius:var(--rs);
  border:none;
  font-size:.92rem;
  font-weight:700;
  cursor:pointer;
  transition:all .2s}
.rb.pri {

background:linear-gradient(135deg,var(--cyan),var(--purple));
  color:var(--white)}
.rb.sec {

background:var(--glass);
  border:1px solid var(--border);
  color:var(--white)}
.rb:hover {

transform:translateY(-2px);
  box-shadow:0 6px 18px rgba(0,0,0,.3)}
#scr-ref {

padding:0}
.cat-leg {

display:flex;
  flex-wrap:wrap;
  gap:5px;
  padding:7px 11px;
  border-bottom:1px solid var(--border)}
.cat-chip {

display:flex;
  align-items:center;
  gap:4px;
  font-size:.62rem;
  padding:2px 6px;
  border-radius:9px;
  cursor:pointer}
.cat-dot {

width:7px;
  height:7px;
  border-radius:50%;
  flex-shrink:0}
.pt-wrap {

width:100%;
  overflow-x:auto;
  padding:9px;
  flex:1}
.pt-grid {

display:inline-grid;
  grid-template-columns:repeat(18,minmax(38px,1fr));
  gap:2px;
  min-width:720px}
.pt-cell {

border-radius:4px;
  padding:2px;
  cursor:pointer;
  transition:all .15s;
  border:1px solid transparent;

  min-height:38px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center}
.pt-cell:hover {

transform:scale(1.2);
  z-index:10;
  border-color:rgba(255,255,255,.5);
  box-shadow:0 0 8px rgba(255,255,255,.2)}
.pt-n {

font-size:.48rem;
  color:rgba(255,255,255,.6);
  align-self:flex-start}
.pt-s {

font-size:.82rem;
  font-weight:900}
.pt-name {

font-size:.38rem;
  opacity:.8;
  text-align:center}
.pt-empty {

min-height:38px}
.pt-sep {

font-size:.48rem;
  color:var(--dim);
  display:flex;
  align-items:center;
  justify-content:flex-end;
  padding-right:3px;
  grid-column:span 2;
  min-height:38px}
.cat-alkali {

background:rgba(233,30,99,.3)}
.cat-alkaline {

background:rgba(255,87,34,.3)}
.cat-transition {

background:rgba(255,193,7,.25)}
.cat-post {

background:rgba(76,175,80,.3)}
.cat-metalloid {

background:rgba(0,150,136,.3)}
.cat-nonmetal {

background:rgba(33,150,243,.3)}
.cat-halogen {

background:rgba(156,39,176,.3)}
.cat-noble {

background:rgba(0,188,212,.3)}
.cat-lanthanide {

background:rgba(244,67,54,.2)}
.cat-actinide {

background:rgba(255,152,0,.2)}
.el-modal {

position:fixed;
  inset:0;
  z-index:300;
  display:flex;
  align-items:flex-end;
  justify-content:center;

  background:rgba(0,0,0,.7);
  backdrop-filter:blur(4px);
  transition:opacity .3s;
  opacity:0;
  pointer-events:none}
.el-modal.open {

opacity:1;
  pointer-events:all}
.el-modal-card {

width:100%;
  max-width:480px;
  background:var(--panel);
  border:1px solid var(--border);

  border-radius:var(--r) var(--r) 0 0;
  padding:22px 18px 38px;
  position:relative;

  transform:translateY(100%);
  transition:transform .35s cubic-bezier(.32,.72,0,1);
  max-height:80vh;
  overflow-y:auto}
.el-modal.open .el-modal-card {

transform:translateY(0)}
.m-hdr {

display:flex;
  align-items:center;
  gap:14px;
  margin-bottom:14px}
.m-sym-box {

width:68px;
  height:68px;
  border-radius:11px;
  flex-shrink:0;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  border:2px solid}
.m-sym {

font-size:1.9rem;
  font-weight:900}
.m-num {

font-size:.68rem;
  opacity:.7}
.m-name {

font-size:1.3rem;
  font-weight:900}
.m-name2 {

font-size:.87rem;
  color:var(--dim)}
.m-cat {

font-size:.72rem;
  margin-top:3px;
  padding:2px 9px;
  border-radius:18px;
  display:inline-block}
.m-props {

display:grid;
  grid-template-columns:1fr 1fr;
  gap:7px}
.prop {

background:var(--glass);
  border:1px solid var(--border);
  border-radius:var(--rs);
  padding:9px}
.prop-l {

font-size:.62rem;
  color:var(--dim);
  margin-bottom:2px;
  text-transform:uppercase;
  letter-spacing:1px}
.prop-v {

font-size:.88rem;
  font-weight:700}
.m-close {

position:absolute;
  top:12px;
  right:12px;
  width:28px;
  height:28px;
  border-radius:50%;

  background:var(--glass);
  border:1px solid var(--border);
  cursor:pointer;

  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--dim);
  font-size:.85rem}
#scr-lb {

padding:0}
.lb-list {

width:100%;
  max-width:480px;
  padding:14px 14px 80px}
.lb-row {

display:flex;
  align-items:center;
  gap:11px;
  background:var(--panel);
  border:1px solid var(--border);

  border-radius:var(--rs);
  padding:11px 14px;
  margin-bottom:7px}
.lb-row.me {

border-color:var(--gold);
  box-shadow:0 0 11px rgba(255,215,64,.2)}
.lb-rank {

font-size:1.1rem;
  font-weight:900;
  width:30px;
  text-align:center;
  flex-shrink:0}
.lb-rank.gold {

color:var(--gold)}
.lb-rank.silver {

color:#b0bec5}
.lb-rank.bronze {

color:#a1887f}
.lb-name {

flex:1;
  font-weight:700;
  min-width:0;
  overflow:hidden;
  text-overflow:ellipsis}
.lb-score {

font-size:1rem;
  font-weight:900;
  color:var(--cyan)}
#scr-ach {

padding:0}
.ach-grid {

width:100%;
  max-width:480px;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:9px;
  padding:14px 14px 80px}
.ac {

background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--rs);

  padding:14px 11px;
  text-align:center;
  position:relative;
  overflow:hidden;
  transition:all .2s}
.ac.earned {

border-color:var(--gold);
  box-shadow:0 0 14px rgba(255,215,64,.15)}
.ac.locked {

opacity:.4;
  filter:grayscale(1)}
.ac-ico {

font-size:1.9rem;
  margin-bottom:5px;
  display:block}
.ac-name {

font-size:.77rem;
  font-weight:700}
.ac-desc {

font-size:.66rem;
  color:var(--dim);
  margin-top:2px;
  line-height:1.3}
.ac-badge {

position:absolute;
  top:5px;
  right:5px;
  width:16px;
  height:16px;
  border-radius:50%;

  background:var(--gold);
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:.55rem;
  font-weight:900;
  color:var(--bg);
  opacity:0}
.ac.earned .ac-badge {

opacity:1}
#scr-profile {

justify-content:center}
.pform {

width:100%;
  max-width:390px;
  padding:28px 22px;
  background:var(--panel);

  border:1px solid var(--border);
  border-radius:var(--r);
  box-shadow:var(--shadow);
  animation:fadeUp .4s}
.pform h2 {

font-size:1.3rem;
  font-weight:900;
  text-align:center;
  margin-bottom:5px}
.pform p {

color:var(--dim);
  text-align:center;
  font-size:.82rem;
  margin-bottom:22px}
.fl {

font-size:.72rem;
  color:var(--dim);
  letter-spacing:1px;
  text-transform:uppercase;
  margin-bottom:5px;
  display:block}
.fi {

width:100%;
  padding:12px 14px;
  background:var(--glass);
  border:1px solid var(--border);

  border-radius:var(--rs);
  color:var(--white);
  font-size:.95rem;
  outline:none;
  margin-bottom:14px;
  font-family:var(--font);
  transition:border-color .2s}
.fi:focus {

border-color:var(--cyan)}
.av-pick {

display:flex;
  gap:9px;
  flex-wrap:wrap;
  margin-bottom:18px;
  justify-content:center}
.av-opt {

width:44px;
  height:44px;
  border-radius:50%;
  border:2px solid var(--border);
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:1.4rem;
  cursor:pointer;
  transition:all .2s;
  background:var(--glass)}
.av-opt.sel {

border-color:var(--gold);
  box-shadow:0 0 11px rgba(255,215,64,.4);
  transform:scale(1.1)}
.fbtn {

width:100%;
  padding:14px;
  background:linear-gradient(135deg,var(--cyan),var(--purple));

  border:none;
  border-radius:var(--rs);
  color:var(--white);
  font-size:.95rem;
  font-weight:800;
  cursor:pointer;
  letter-spacing:1px;
  transition:all .2s}
.fbtn:hover {

box-shadow:0 6px 22px rgba(0,229,255,.4);
  transform:translateY(-2px)}
.lang-opts {

display:flex;
  gap:9px;
  margin-bottom:18px}
.lo {

flex:1;
  padding:11px;
  border-radius:var(--rs);
  border:1px solid var(--border);
  background:var(--glass);
  cursor:pointer;
  text-align:center;
  font-size:.87rem;
  font-weight:700;
  transition:all .2s}
.lo.sel {

border-color:var(--cyan);
  background:rgba(0,229,255,.1);
  color:var(--cyan)}
.ach-notif {

position:fixed;
  top:14px;
  left:50%;
  transform:translateX(-50%) translateY(-110px);

  background:linear-gradient(135deg,#1a3a1a,#0a2a0a);
  border:1px solid var(--green);

  border-radius:var(--r);
  padding:11px 18px;
  display:flex;
  align-items:center;
  gap:11px;
  z-index:500;

  transition:transform .4s cubic-bezier(.32,.72,0,1);
  box-shadow:0 8px 30px rgba(0,230,118,.3);
  min-width:260px;
  max-width:90vw}
.ach-notif.show {

transform:translateX(-50%) translateY(0)}
.an-ico {

font-size:1.9rem}
.an-title {

font-size:.62rem;
  color:var(--green);
  letter-spacing:2px;
  text-transform:uppercase}
.an-name {

font-size:.88rem;
  font-weight:700}
/* ── In-game Home pill (visible in every play mode) ── */
.g-home {
  position:fixed;
  left:50%;
  transform:translateX(-50%);
  bottom:16px;
  z-index:45;
  display:flex;
  align-items:center;
  gap:7px;
  min-height:44px;
  padding:0 20px;
  border-radius:999px;
  background:var(--panel);
  border:1px solid var(--border);
  color:var(--cyan);
  font-family:inherit;
  font-size:.82rem;
  font-weight:800;
  letter-spacing:1px;
  cursor:pointer;
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  box-shadow:var(--shadow);
  transition:bottom .25s ease,background .2s ease,transform .15s ease,border-color .2s ease}
.g-home:hover {
  background:var(--glass);
  border-color:var(--cyan)}
.g-home:active {
  transform:translateX(-50%) scale(.94)}
.gh-ic {
  font-size:1rem;
  line-height:1}

.spd-banner {
  position:fixed;
  bottom:0;
  left:0;
  right:0;
  z-index:50;
  text-align:center;
  padding:6px 8px;
  background:linear-gradient(90deg,var(--red),#ff6090);
  font-size:.78rem;
  font-weight:700;
  letter-spacing:2px;
  box-shadow:0 -2px 14px rgba(255,23,68,.4);
  animation:urg .8s infinite;
  display:none}

.plat-banner {
  position:fixed;
  bottom:0;
  left:0;
  right:0;
  z-index:50;
  text-align:center;
  padding:6px 8px;
  background:linear-gradient(90deg,#6366f1,#a855f7,#ec4899);
  color:#fff;
  font-size:.78rem;
  font-weight:800;
  letter-spacing:1.5px;
  box-shadow:0 -2px 14px rgba(168,85,247,.4);
  display:none;
  animation:platShimmer 4s ease-in-out infinite;
}
@keyframes platShimmer {
  0%,100% { filter: hue-rotate(0deg); }
  50% { filter: hue-rotate(30deg); }
}

.rev-banner {
  position:fixed;
  bottom:0;
  left:0;
  right:0;
  z-index:50;
  text-align:center;
  padding:6px 8px;
  background:linear-gradient(90deg,#ff6d00,#ff9100,#ffc400);
  color:#1a1000;
  font-size:.78rem;
  font-weight:800;
  letter-spacing:1.5px;
  box-shadow:0 -2px 14px rgba(255,145,0,.45);
  display:none}

/* ── Responsive / Mobile Overrides ── */
@media(max-width:480px) {
  .opts {

grid-template-columns:1fr}
.match-wrap {

flex-direction:column}
.pt-grid {
  min-width:660px}
.g-home {
  padding:0 16px;
  font-size:.76rem;
  letter-spacing:.5px}
}

/* ── Feedback Modal ── */
.fb-modal {
  position: fixed;
  inset: 0;
  z-index: 400;
  display: flex;
  align-items: flex-start;   /* scroll-safe: never clips the top on short screens */
  justify-content: center;
  background: rgba(4, 13, 26, 0.78);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  padding: 16px;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}
.fb-modal.open {
  opacity: 1;
  pointer-events: all;
}
.fb-card {
  width: 100%;
  max-width: 440px;
  margin: auto;              /* centres when there is room, scrolls when there isn't */
  background: var(--bg2);
  border: 1.5px solid var(--border);
  border-radius: 20px;
  padding: 26px 22px 24px;
  text-align: center;
  transform: scale(0.85) translateY(15px);
  opacity: 0;
  transition: transform 0.35s cubic-bezier(0.34, 1.45, 0.64, 1), opacity 0.25s ease;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7), 0 0 30px rgba(0, 229, 255, 0.12);
}
.fb-card::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.fb-modal.open .fb-card {
  transform: scale(1) translateY(0);
  opacity: 1;
}

/* Correct variant */
.fb-modal.correct .fb-card {
  border-color: var(--green);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7), 0 0 35px rgba(0, 230, 118, 0.3);
}
.fb-modal.correct .fb-card::before {
  background: radial-gradient(ellipse at 50% 0%, rgba(0,230,118,.15), transparent 70%);
  opacity: 1;
}

/* Wrong variant */
.fb-modal.wrong .fb-card {
  border-color: var(--red);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7), 0 0 35px rgba(255, 23, 68, 0.3);
}
.fb-modal.wrong .fb-card::before {
  background: radial-gradient(ellipse at 50% 0%, rgba(255,23,68,.15), transparent 70%);
  opacity: 1;
}

.fb-icon {
  font-size: 3rem;
  line-height: 1;
  margin-bottom: 8px;
  display: inline-block;
}
.fb-modal.correct .fb-icon {
  animation: fbBounce 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}
.fb-modal.wrong .fb-icon {
  animation: fbShake 0.45s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}
@keyframes fbBounce {
  0%   { transform: scale(0) rotate(-20deg); opacity: 0; }
  60%  { transform: scale(1.3) rotate(8deg); opacity: 1; }
  80%  { transform: scale(0.9) rotate(-4deg); }
  100% { transform: scale(1) rotate(0); opacity: 1; }
}
@keyframes fbShake {
  0%, 100% { transform: translateX(0) scale(1); }
  15%       { transform: translateX(-10px) scale(1.1); }
  30%       { transform: translateX(10px) scale(1.1); }
  45%       { transform: translateX(-7px); }
  60%       { transform: translateX(7px); }
  75%       { transform: translateX(-3px); }
}

.fb-result {
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: 1px;
  margin-bottom: 6px;
}
.fb-modal.correct .fb-result { color: var(--green); }
.fb-modal.wrong   .fb-result { color: var(--red); }

.fb-correct-wrap {
  display: none;
  margin: 10px 0 6px;
  padding: 10px 14px;
  background: rgba(0,230,118,.08);
  border: 1px solid rgba(0,230,118,.25);
  border-radius: var(--rs);
}
.fb-modal.wrong .fb-correct-wrap { display: block; }
.fb-correct-lbl {
  font-size: .68rem;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 4px;
}
.fb-correct-val {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--green);
}

.fb-pts {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--gold);
  min-height: 1.6rem;
  margin-bottom: 4px;
  animation: fbPtsIn 0.4s 0.2s ease both;
}
@keyframes fbPtsIn {
  from { opacity: 0; transform: translateY(8px) scale(0.8); }
  to   { opacity: 1; transform: none; }
}

.fb-expl {
  font-size: .82rem;
  color: var(--dim);
  line-height: 1.55;
  padding: 10px 12px;
  background: rgba(0,229,255,.05);
  border: 1px solid rgba(0,229,255,.12);
  border-radius: var(--rs);
  text-align: left;
  margin: 10px 0 12px;
  animation: fbPtsIn 0.4s 0.15s ease both;
}
.fb-expl strong { color: var(--cyan); }

.fb-ref {
  width: 100%;
  padding: 11px 14px;
  margin-bottom: 10px;
  border-radius: var(--r);
  font-size: .84rem;
  font-weight: 800;
  letter-spacing: .6px;
  cursor: pointer;
  color: var(--cyan);
  background: rgba(0,229,255,.08);
  border: 1px solid rgba(0,229,255,.28);
  transition: all 0.2s;
  animation: fbPtsIn 0.4s 0.22s ease both;
}
.fb-ref:hover {
  background: rgba(0,229,255,.16);
  transform: translateY(-1px);
}
.fb-ref:active { transform: scale(0.97); }

/* Return-to-quiz pill on the periodic table header */
.ref-return {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .5px;
  cursor: pointer;
  color: var(--cyan);
  background: rgba(0,229,255,.1);
  border: 1px solid rgba(0,229,255,.3);
  flex-shrink: 0;
  transition: all 0.2s;
}
.ref-return:hover { background: rgba(0,229,255,.22); }
.ref-return:active { transform: scale(0.96); }

.fb-next {
  width: 100%;
  padding: 15px;
  border: none;
  border-radius: var(--r);
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  letter-spacing: 1px;
  color: var(--white);
  transition: all 0.2s;
  animation: fbPtsIn 0.4s 0.25s ease both;
  position: relative;
  overflow: hidden;
}
.fb-modal.correct .fb-next {
  background: linear-gradient(135deg, var(--green), var(--cyan2));
  box-shadow: 0 4px 20px rgba(0,230,118,.35);
}
.fb-modal.wrong .fb-next {
  background: linear-gradient(135deg, #ff5252, var(--purple));
  box-shadow: 0 4px 20px rgba(255,23,68,.3);
}
.fb-next:hover {
  transform: translateY(-2px);
  filter: brightness(1.15);
}
.fb-next:active { transform: scale(0.97); }

/* Speed-run paused indicator */
.sr-paused-bar {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--gold2));
  animation: srPulse 1s ease-in-out infinite;
}
@keyframes srPulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

/* ── Multi-Learner Switch System ── */
.user-pill-btn {
  background: var(--glass);
  border: 1px solid var(--border);
  color: var(--white);
  padding: 5px 12px;
  border-radius: 20px;
  cursor: pointer;
  font-size: .82rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all .2s;
}
.user-pill-btn:hover {
  background: rgba(0, 229, 255, 0.14);
  border-color: var(--cyan);
}
.switch-btn {
  background: rgba(0, 229, 255, 0.12);
  border: 1px solid rgba(0, 229, 255, 0.3);
  color: var(--white);
  padding: 4px 10px;
  border-radius: 14px;
  cursor: pointer;
  font-size: .75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: all .2s;
}
.switch-btn:hover {
  background: rgba(0, 229, 255, 0.22);
  border-color: var(--cyan);
  transform: translateY(-1px);
}
.prof-modal {
  position: fixed;
  inset: 0;
  z-index: 450;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(4, 13, 26, 0.82);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  padding: 16px;
}
.prof-modal.open {
  opacity: 1;
  pointer-events: all;
}
.prof-card {
  width: 100%;
  max-width: 460px;
  max-height: 85vh;
  background: var(--bg2);
  border: 1.5px solid var(--border);
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7), 0 0 35px rgba(0, 229, 255, 0.15);
  transform: scale(0.88) translateY(15px);
  opacity: 0;
  transition: transform 0.35s cubic-bezier(0.34, 1.45, 0.64, 1), opacity 0.25s ease;
  overflow: hidden;
}
.prof-modal.open .prof-card {
  transform: scale(1) translateY(0);
  opacity: 1;
}
.prof-hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 22px 14px;
  border-bottom: 1px solid var(--border);
}
.prof-title {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--white);
  letter-spacing: .5px;
}
.prof-sub {
  font-size: .75rem;
  color: var(--dim);
  margin-top: 3px;
}
.prof-list {
  padding: 16px 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 52vh;
}
.prof-item {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 16px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}
.prof-item:hover {
  background: rgba(0, 229, 255, 0.08);
  border-color: var(--cyan);
  transform: translateY(-1px);
}
.prof-item.active {
  border-color: var(--cyan);
  background: rgba(0, 229, 255, 0.12);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.2);
}
.prof-item-av {
  font-size: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(0, 229, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.prof-item-info {
  flex: 1;
  min-width: 0;
}
.prof-item-name-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.prof-item-name {
  font-size: 1rem;
  font-weight: 800;
  color: var(--white);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.prof-badge-active {
  font-size: .65rem;
  font-weight: 800;
  color: var(--green);
  background: rgba(0, 230, 118, 0.15);
  border: 1px solid rgba(0, 230, 118, 0.3);
  padding: 2px 7px;
  border-radius: 10px;
  letter-spacing: 1px;
}
.prof-item-stats {
  display: flex;
  gap: 10px;
  font-size: .75rem;
  color: var(--dim);
  margin-top: 4px;
}
.prof-item-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}
.prof-sel-btn {
  background: rgba(0, 229, 255, 0.15);
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-size: .78rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.prof-sel-btn:hover {
  background: var(--cyan);
  color: var(--bg);
}
.prof-del-btn {
  background: transparent;
  border: 1px solid rgba(255, 23, 68, 0.2);
  color: var(--dim);
  font-size: .9rem;
  padding: 6px 8px;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
}
.prof-del-btn:hover {
  background: rgba(255, 23, 68, 0.15);
  border-color: var(--red);
  color: var(--red);
}
.prof-actions {
  padding: 14px 20px 20px;
  border-top: 1px solid var(--border);
}
.add-learner-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--cyan2), var(--cyan));
  color: var(--bg);
  border: none;
  border-radius: 14px;
  font-size: .95rem;
  font-weight: 800;
  letter-spacing: .5px;
  cursor: pointer;
  transition: all .2s;
  box-shadow: 0 4px 18px rgba(0, 229, 255, 0.25);
}
.add-learner-btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
  box-shadow: 0 6px 22px rgba(0, 229, 255, 0.4);
}