/* ==========================================================================
   CharmingPlay · style.css
   Unified design system for students — tools & mini games
   Mobile-first · iPhone / iPad / split-view friendly · no external assets
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design tokens
   -------------------------------------------------------------------------- */
:root{
  /* palette — deep study night + warm luxury accents */
  --bg-0:#080b14;
  --bg-1:#0b1020;
  --bg-2:#101731;
  --bg-3:#161f3f;
  --ink:#edf1ff;
  --ink-2:#aab5d8;
  --ink-3:#77839f;
  --line:rgba(255,255,255,.085);
  --line-2:rgba(255,255,255,.16);

  --brand:#7c6cff;
  --brand-2:#22d3ee;
  --brand-3:#ffcf70;
  --brand-4:#ff6f9c;
  --ok:#3ddc97;
  --warn:#ffbd4a;
  --bad:#ff6b6b;

  --grad-brand:linear-gradient(135deg,#7c6cff 0%,#22d3ee 100%);
  --grad-gold:linear-gradient(135deg,#ffe3a3 0%,#ffb547 45%,#ff7a59 100%);
  --grad-glass:linear-gradient(160deg,rgba(255,255,255,.085),rgba(255,255,255,.025));

  /* surfaces */
  --card-bg:rgba(255,255,255,.045);
  --card-bd:1px solid rgba(255,255,255,.10);
  --glass-blur:blur(18px) saturate(160%);
  --radius-xs:10px;
  --radius-sm:14px;
  --radius:18px;
  --radius-lg:24px;
  --radius-xl:30px;

  /* shadows */
  --sh-1:0 6px 18px rgba(0,0,0,.28);
  --sh-2:0 14px 40px rgba(0,0,0,.38);
  --sh-glow:0 0 0 1px rgba(124,108,255,.35),0 10px 40px rgba(124,108,255,.28);

  /* geometry */
  --tap:48px;
  --gap:12px;
  --maxw:1160px;
  --sa-t:env(safe-area-inset-top,0px);
  --sa-r:env(safe-area-inset-right,0px);
  --sa-b:env(safe-area-inset-bottom,0px);
  --sa-l:env(safe-area-inset-left,0px);

  /* motion */
  --ease:cubic-bezier(.22,.68,.26,1);
  --ease-out:cubic-bezier(.16,1,.3,1);
  --ease-spring:cubic-bezier(.34,1.56,.64,1);
  --dur-1:160ms;
  --dur-2:260ms;
  --dur-3:420ms;
  --dur-4:700ms;

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Segoe UI",
          "PingFang HK", "PingFang TC", "PingFang SC", "Microsoft JhengHei", "Noto Sans TC",
          "Noto Sans CJK TC", "Hiragino Sans", Roboto, Helvetica, Arial, sans-serif;
  --font-num: "SF Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --font-cjk: "PingFang HK", "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", "Hiragino Sans", sans-serif;
}

/* optional daylight theme (settings) */
html[data-theme="day"]{
  --bg-0:#f4f5fb;
  --bg-1:#eef0f8;
  --bg-2:#e6e9f5;
  --bg-3:#dde1f0;
  --ink:#131a2e;
  --ink-2:#4a5476;
  --ink-3:#7a8199;
  --line:rgba(16,23,49,.10);
  --line-2:rgba(16,23,49,.2);
  --card-bg:rgba(255,255,255,.66);
  --card-bd:1px solid rgba(16,23,49,.08);
  --sh-1:0 6px 18px rgba(30,41,80,.10);
  --sh-2:0 16px 40px rgba(30,41,80,.14);
}

/* --------------------------------------------------------------------------
   2. Reset & base
   -------------------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  overflow-x:hidden;
  /* NOTE: no global scroll-behavior:smooth — smooth-scrolling a very long page makes every
     `position:sticky` element (the top bar) paint at intermediate offsets and look "unstuck". */
  scroll-behavior:auto;
}
html,body{
  height:100%;
  overscroll-behavior:none;
}
body{
  margin:0;
  min-height:100vh;
  min-height:100dvh;
  font-family:var(--font);
  font-size:16px;
  line-height:1.6;
  color:var(--ink);
  background:var(--bg-0);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  -webkit-tap-highlight-color:transparent;
  text-rendering:optimizeLegibility;
  transition:background var(--dur-3) var(--ease),color var(--dur-3) var(--ease);
}
body::before{
  content:"";
  position:fixed;
  inset:-20%;
  z-index:-2;
  background:
    radial-gradient(48% 38% at 12% 4%, rgba(124,108,255,.34), transparent 62%),
    radial-gradient(46% 36% at 92% 10%, rgba(34,211,238,.20), transparent 60%),
    radial-gradient(52% 42% at 50% 108%, rgba(255,111,156,.16), transparent 64%),
    linear-gradient(180deg,var(--bg-1),var(--bg-0) 60%,#06080f);
  transform:translateZ(0);
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  opacity:.55;
  background-image:
    linear-gradient(rgba(255,255,255,.022) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.022) 1px,transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(ellipse at 50% 0%,#000 0%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse at 50% 0%,#000 0%,transparent 78%);
}
html[data-theme="day"] body::before{
  background:
    radial-gradient(48% 38% at 10% 0%, rgba(124,108,255,.22), transparent 60%),
    radial-gradient(46% 36% at 94% 8%, rgba(34,211,238,.18), transparent 60%),
    radial-gradient(52% 42% at 50% 110%, rgba(255,111,156,.12), transparent 64%),
    linear-gradient(180deg,#f7f8fd,#eceefa 70%,#e6e9f6);
}
html[data-theme="day"] body::after{opacity:.6;background-image:linear-gradient(rgba(16,23,49,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(16,23,49,.035) 1px,transparent 1px)}

@keyframes auroraDrift{
  0%{transform:translate3d(0,0,0) scale(1)}
  50%{transform:translate3d(-2%,1.5%,0) scale(1.05)}
  100%{transform:translate3d(2%,-1%,0) scale(1.02)}
}

img,svg,canvas{display:block;max-width:100%}
a{color:var(--brand-2);text-decoration:none;-webkit-tap-highlight-color:transparent}
a:hover{color:#8ff0ff}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;touch-action:manipulation}
input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4,p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
[hidden]{display:none !important}
::selection{background:rgba(124,108,255,.45);color:#fff}

/* a11y */
:focus{outline:none}
:focus-visible{outline:2px solid var(--brand-2);outline-offset:3px;border-radius:8px}
.sr-only{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0;
}
.skip-link{
  position:fixed;left:50%;top:-80px;transform:translateX(-50%);z-index:1000;
  padding:12px 20px;border-radius:999px;background:var(--brand);color:#fff;font-weight:700;
  transition:top var(--dur-2) var(--ease);
}
.skip-link:focus{top:calc(var(--sa-t) + 10px)}

/* --------------------------------------------------------------------------
   3. Reduced motion — global
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
}
html[data-motion="off"] *,html[data-motion="off"] *::before,html[data-motion="off"] *::after{
  animation-duration:.01ms !important;
  animation-iteration-count:1 !important;
  transition-duration:.01ms !important;
}

/* --------------------------------------------------------------------------
   4. Top bar
   -------------------------------------------------------------------------- */
.topbar{
  /* the flex-item nuance: any non-0 margin-top makes a sticky element keep that gap below the
     viewport edge; auto margins on a stretched flex item render as 0 but break sticky offsets
     in Safari/WebKit, so pin both to 0 and reserve the notch inset as body padding instead. */
  margin-top:0 !important;
  margin-bottom:0 !important;
  position:sticky;
  top:0;
  align-self:flex-start;
  width:100%;
  min-width:0;
  flex-shrink:0;
  z-index:120;
  padding-top:var(--sa-t);
  background:linear-gradient(180deg,rgba(8,11,20,.96),rgba(8,11,20,.86));
  -webkit-backdrop-filter:var(--glass-blur);
  backdrop-filter:var(--glass-blur);
  border-bottom:1px solid var(--line);
}
html[data-theme="day"] .topbar{background:linear-gradient(180deg,rgba(247,248,253,.9),rgba(247,248,253,.66))}
.topbar-inner{
  max-width:var(--maxw);
  margin:0 auto;
  height:60px;
  padding:0 max(14px,var(--sa-l)) 0 max(14px,var(--sa-r));
  display:flex;
  align-items:center;
  gap:10px;
  overflow:hidden;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:var(--tap);
  padding-right:4px;
  font-weight:800;
  letter-spacing:.2px;
  color:var(--ink);
  white-space:nowrap;
  flex-shrink:0;
}
.brand:hover{color:var(--ink)}
.brand-mark{
  width:34px;height:34px;border-radius:11px;flex-shrink:0;
  display:grid;place-items:center;
  background:var(--grad-brand);
  box-shadow:0 6px 18px rgba(124,108,255,.42),inset 0 1px 0 rgba(255,255,255,.35);
  position:relative;
  overflow:hidden;
}
.brand-mark svg{width:20px;height:20px;color:#fff}
.brand-mark::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(115deg,transparent 30%,rgba(255,255,255,.55) 50%,transparent 70%);
  transform:translateX(-120%);
  animation:sheen 6s var(--ease) infinite;
}
@keyframes sheen{0%,72%{transform:translateX(-120%)}100%{transform:translateX(120%)}}
.brand > span:last-child{min-width:0;overflow:hidden;text-overflow:ellipsis}
.brand-name{font-size:17px;line-height:1;display:block;white-space:nowrap}
.brand-sub{display:block;font-size:10px;font-weight:600;color:var(--ink-3);letter-spacing:1.6px;text-transform:uppercase;margin-top:3px}
.topbar-spacer{flex:1 1 auto;min-width:0}
.top-actions{display:flex;align-items:center;gap:6px;flex:0 0 auto;min-width:max-content}

/* icon button (48px) */
.icon-btn{
  width:var(--tap);height:var(--tap);flex-shrink:0;
  display:inline-grid;place-items:center;
  border-radius:15px;
  border:1px solid var(--line);
  background:var(--card-glass,rgba(255,255,255,.05));
  color:var(--ink-2);
  position:relative;
  -webkit-user-select:none;user-select:none;
  transition:transform var(--dur-1) var(--ease-spring),background var(--dur-2),color var(--dur-2),border-color var(--dur-2),box-shadow var(--dur-2);
}
.icon-btn:active{transform:scale(.92)}
@media (hover:hover){
  .icon-btn:hover{background:rgba(255,255,255,.10);color:var(--ink);border-color:var(--line-2);box-shadow:var(--sh-1)}
}
.icon-btn svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;transition:transform var(--dur-2) var(--ease-spring)}
.icon-btn.is-on{color:var(--brand-3);border-color:rgba(255,207,112,.45);background:rgba(255,207,112,.10);box-shadow:0 0 0 1px rgba(255,207,112,.12),0 0 22px rgba(255,207,112,.18)}
.icon-btn.is-off{opacity:.55}
.icon-btn.is-muted::after{
  content:"";position:absolute;width:26px;height:2px;border-radius:2px;background:currentColor;transform:rotate(-45deg);
}
.icon-btn-pulse::before{
  content:"";position:absolute;inset:-1px;border-radius:16px;border:1px solid rgba(255,207,112,.6);
  opacity:0;animation:pulseRing 2.4s var(--ease) infinite;
}
@keyframes pulseRing{0%{opacity:.8;transform:scale(1)}70%,100%{opacity:0;transform:scale(1.22)}}

/* language switch pill */
.lang-switch{
  height:var(--tap);
  min-width:74px;
  flex-shrink:0;
  padding:0 12px;
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  border-radius:15px;
  border:1px solid var(--line);
  background:var(--card-glass,rgba(255,255,255,.05));
  font-size:12px;font-weight:800;letter-spacing:1.2px;
  color:var(--ink-2);
  position:relative;
  overflow:hidden;
  -webkit-user-select:none;user-select:none;
  transition:color var(--dur-2),border-color var(--dur-2),transform var(--dur-1) var(--ease-spring);
}
.lang-switch:active{transform:scale(.94)}
.lang-switch .lang-current{color:var(--ink);letter-spacing:1.4px}
.lang-switch .lang-sep{opacity:.35;font-weight:500}
.lang-switch .lang-alt{opacity:.55;letter-spacing:1px;font-size:11px}
.lang-switch::before{
  content:"";position:absolute;inset:3px;border-radius:12px;background:var(--grad-brand);opacity:0;
  transition:opacity var(--dur-2);
}
.lang-switch > *{position:relative;z-index:1}
.lang-switch.is-turning{animation:langFlip var(--dur-3) var(--ease-spring)}
@keyframes langFlip{0%{transform:rotateX(0)}45%{transform:rotateX(90deg) scale(.94)}100%{transform:rotateX(0)}}
@media (hover:hover){.lang-switch:hover{border-color:var(--line-2);color:var(--ink)};.lang-switch:hover::before{opacity:.14}}

/* secondary back link inside topbar (non-home pages) */
.topbar-back{
  display:inline-flex;align-items:center;gap:6px;
  height:var(--tap);padding:0 10px;border-radius:14px;
  color:var(--ink-2);font-size:13px;font-weight:600;
  transition:background var(--dur-2),color var(--dur-2);
}
.topbar-back svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
@media (hover:hover){.topbar-back:hover{background:rgba(255,255,255,.07);color:var(--ink)}}

/* --------------------------------------------------------------------------
   5. Layout helpers
   -------------------------------------------------------------------------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding-left:max(16px,var(--sa-l));
  padding-right:max(16px,var(--sa-r));
}
.page{
  min-height:100vh;
  min-height:100dvh;
  display:flex;
  flex-direction:column;
}
.main{flex:1 0 auto;padding-bottom:calc(40px + var(--sa-b))}
.main-tight{padding-top:18px}
.section{padding:26px 0}
.stack{display:flex;flex-direction:column;gap:var(--gap)}
.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.row-between{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.grow{flex:1 1 auto;min-width:0}
.center{text-align:center}
.muted{color:var(--ink-2)}
.dim{color:var(--ink-3)}
.tiny{font-size:12px}
.small{font-size:13px}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums}

/* page header (tools / games) */
.page-head{
  padding:22px 0 8px;
  display:flex;align-items:flex-end;justify-content:space-between;gap:14px;flex-wrap:wrap;
}
.crumb{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  font-size:12px;font-weight:700;letter-spacing:1.4px;text-transform:uppercase;color:var(--ink-3);
  margin-bottom:8px;
}
.crumb a{color:var(--ink-3)}
@media (hover:hover){.crumb a:hover{color:var(--brand-2)}}
.crumb .sep{opacity:.5}
.crumb .now{color:var(--brand-3)}
.page-title{
  font-family:var(--font),var(--font-cjk);
  font-size:clamp(26px,6vw,40px);
  font-weight:850;
  letter-spacing:-.6px;
  line-height:1.18;
  background:linear-gradient(180deg,#fff 0%,#c9d2f0 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
html[data-theme="day"] .page-title{background:linear-gradient(180deg,#131a2e 0%,#3c4770 100%);-webkit-background-clip:text;background-clip:text}
.page-desc{color:var(--ink-2);font-size:14.5px;margin-top:8px;max-width:62ch}

/* --------------------------------------------------------------------------
   6. Cards, glass, chips, buttons
   -------------------------------------------------------------------------- */
.card{
  position:relative;
  isolation:isolate;
  background:var(--card-bg);
  border:var(--card-bd);
  border-radius:var(--radius-lg);
  box-shadow:var(--sh-1),inset 0 1px 0 rgba(255,255,255,.06);
  padding:18px;
  transition:transform var(--dur-2) var(--ease-out),box-shadow var(--dur-3),border-color var(--dur-2),background var(--dur-2);
}
.glass{
  -webkit-backdrop-filter:var(--glass-blur);
  backdrop-filter:var(--glass-blur);
}
.card-pad-lg{padding:22px}
.card-title{
  display:flex;align-items:center;gap:8px;
  font-size:13px;font-weight:800;letter-spacing:1.6px;text-transform:uppercase;color:var(--ink-3);
  margin-bottom:14px;
}
.card-title svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;color:var(--brand-2)}
.panel{
  background:rgba(255,255,255,.035);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:14px;
}
.panel-soft{background:rgba(255,255,255,.022)}

.btn{
  --btn-bg:rgba(255,255,255,.07);
  --btn-bd:rgba(255,255,255,.14);
  --btn-fg:var(--ink);
  min-height:var(--tap);
  padding:0 18px;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:15px;
  border:1px solid var(--btn-bd);
  background:var(--btn-bg);
  color:var(--btn-fg);
  font-weight:700;font-size:15px;line-height:1;
  white-space:nowrap;
  position:relative;
  overflow:hidden;
  -webkit-user-select:none;user-select:none;
  touch-action:manipulation;
  transition:transform var(--dur-1) var(--ease-spring),filter var(--dur-2),box-shadow var(--dur-2),background var(--dur-2),border-color var(--dur-2);
}
.btn::after{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:radial-gradient(120px 60px at var(--mx,50%) var(--my,50%),rgba(255,255,255,.22),transparent 70%);
  opacity:0;transition:opacity var(--dur-2);
}
.btn:active{transform:scale(.96)}
@media (hover:hover){.btn:hover{filter:brightness(1.08);box-shadow:var(--sh-1)};.btn:hover::after{opacity:1}}
.btn svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.btn-primary{--btn-bg:var(--grad-brand);--btn-bd:transparent;--btn-fg:#fff;box-shadow:0 8px 24px rgba(124,108,255,.38),inset 0 1px 0 rgba(255,255,255,.25)}
.btn-gold{--btn-bg:var(--grad-gold);--btn-bd:transparent;--btn-fg:#2a1700;box-shadow:0 8px 24px rgba(255,181,71,.3),inset 0 1px 0 rgba(255,255,255,.45)}
.btn-ghost{--btn-bg:transparent;--btn-bd:rgba(255,255,255,.16)}
.btn-soft{--btn-bg:rgba(124,108,255,.14);--btn-bd:rgba(124,108,255,.32);--btn-fg:#c9c2ff}
.btn-danger{--btn-bg:rgba(255,107,107,.12);--btn-bd:rgba(255,107,107,.34);--btn-fg:#ffb3b3}
.btn-sm{min-height:40px;padding:0 14px;font-size:13.5px;border-radius:12px}
.btn-lg{min-height:56px;padding:0 24px;font-size:17px;border-radius:17px}
.btn-block{display:flex;width:100%}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.42;pointer-events:none}
.btn-row{display:flex;gap:10px;flex-wrap:wrap}
.btn-row > .btn{flex:1 1 0;min-width:120px}
@media (max-width:420px){.btn-row{flex-direction:column}.btn-row > .btn{width:100%}}

/* chips */
.chip{
  display:inline-flex;align-items:center;gap:6px;
  min-height:32px;padding:4px 12px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  color:var(--ink-2);
  font-size:12px;font-weight:700;letter-spacing:.3px;
}
.chip svg{width:13px;height:13px;stroke:currentColor;fill:none;stroke-width:2}
.chip-brand{color:#cfc9ff;border-color:rgba(124,108,255,.35);background:rgba(124,108,255,.12)}
.chip-gold{color:#ffe1a6;border-color:rgba(255,207,112,.3);background:rgba(255,207,112,.10)}
.chip-cyan{color:#a9efff;border-color:rgba(34,211,238,.3);background:rgba(34,211,238,.10)}
.chip-pink{color:#ffc2d4;border-color:rgba(255,111,156,.3);background:rgba(255,111,156,.10)}
.chip-ok{color:#a9f3cf;border-color:rgba(61,220,151,.32);background:rgba(61,220,151,.1)}
.chip-bad{color:#ffc0c0;border-color:rgba(255,107,107,.32);background:rgba(255,107,107,.1)}

.kbd{
  display:inline-grid;place-items:center;min-width:22px;height:22px;padding:0 6px;
  border-radius:6px;border:1px solid var(--line-2);background:rgba(255,255,255,.06);
  font-family:var(--font-num);font-size:11px;color:var(--ink-2);
}

/* --------------------------------------------------------------------------
   7. Forms
   -------------------------------------------------------------------------- */
.field{display:flex;flex-direction:column;gap:8px;min-width:0}
.label{font-size:12px;font-weight:800;letter-spacing:1.3px;text-transform:uppercase;color:var(--ink-3)}
.hint{font-size:12px;color:var(--ink-3)}
.input,.select{
  width:100%;
  min-height:var(--tap);
  padding:10px 14px;
  border-radius:14px;
  border:1px solid var(--line-2);
  background:rgba(0,0,0,.22);
  color:var(--ink);
  font-size:16px; /* prevents iOS zoom */
  appearance:none;-webkit-appearance:none;
  transition:border-color var(--dur-2),box-shadow var(--dur-2),background var(--dur-2);
}
html[data-theme="day"] .input,html[data-theme="day"] .select{background:rgba(255,255,255,.85)}
.input::placeholder{color:var(--ink-3)}
.input:focus,.select:focus{border-color:rgba(124,108,255,.75);box-shadow:0 0 0 4px rgba(124,108,255,.18);outline:none}
.input.is-invalid,.select.is-invalid,.is-invalid{border-color:rgba(255,107,107,.7)!important;box-shadow:0 0 0 4px rgba(255,107,107,.14)!important}
.select{
  padding-right:40px;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2377839f' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'><path d='m6 9 6 6 6-6'/></svg>");
  background-repeat:no-repeat;
  background-position:right 14px center;
}
.select option{background:#111733;color:#edf1ff}
.err{font-size:12.5px;color:#ff9d9d;min-height:0;display:none}
.err.show{display:block;animation:shake .4s var(--ease)}
.form-grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}

/* segmented control */
.seg{
  display:inline-flex;
  padding:4px;
  gap:4px;
  border-radius:16px;
  background:rgba(0,0,0,.25);
  border:1px solid var(--line);
  position:relative;
  max-width:100%;
  overflow-x:auto;
  scrollbar-width:none;
}
.seg::-webkit-scrollbar{display:none}
.seg button{
  min-height:40px;
  padding:0 14px;
  border-radius:12px;
  color:var(--ink-2);
  font-size:13.5px;font-weight:700;
  white-space:nowrap;
  transition:color var(--dur-2),background var(--dur-2),transform var(--dur-1) var(--ease-spring);
}
.seg button:active{transform:scale(.95)}
.seg button[aria-pressed="true"],
.seg button[aria-selected="true"]{
  color:#fff;
  background:var(--grad-brand);
  box-shadow:0 4px 14px rgba(124,108,255,.36);
}

/* switch */
.switch{
  position:relative;
  width:54px;height:32px;
  border-radius:999px;
  background:rgba(255,255,255,.12);
  border:1px solid var(--line-2);
  flex-shrink:0;
  transition:background var(--dur-2) var(--ease),border-color var(--dur-2);
}
.switch::after{
  content:"";position:absolute;top:3px;left:3px;width:24px;height:24px;border-radius:50%;
  background:#fff;
  box-shadow:0 2px 6px rgba(0,0,0,.35);
  transition:transform var(--dur-2) var(--ease-spring),background var(--dur-2);
}
.switch[aria-checked="true"]{background:var(--grad-brand);border-color:transparent;box-shadow:0 0 18px rgba(124,108,255,.4)}
.switch[aria-checked="true"]::after{transform:translateX(22px)}

/* --------------------------------------------------------------------------
   8. Pause & classroom overlay
   -------------------------------------------------------------------------- */
.overlay{
  position:fixed;
  inset:0;
  z-index:400;
  display:grid;
  place-items:center;
  padding:calc(var(--sa-t) + 20px) 20px calc(var(--sa-b) + 20px);
  background:rgba(6,9,18,.82);
  -webkit-backdrop-filter:blur(22px) saturate(140%);
  backdrop-filter:blur(22px) saturate(140%);
  opacity:0;
  visibility:hidden;
  transition:opacity var(--dur-3) var(--ease),visibility var(--dur-3);
}
.overlay.is-open{opacity:1;visibility:visible}
.overlay-card{
  width:min(420px,100%);
  text-align:center;
  padding:28px 22px;
  border-radius:var(--radius-xl);
  border:1px solid rgba(255,255,255,.12);
  background:linear-gradient(170deg,rgba(28,36,72,.92),rgba(12,16,34,.96));
  box-shadow:0 30px 80px rgba(0,0,0,.55),inset 0 1px 0 rgba(255,255,255,.08);
  transform:translateY(14px) scale(.96);
  opacity:0;
  transition:transform var(--dur-4) var(--ease-spring),opacity var(--dur-3) var(--ease);
}
.overlay.is-open .overlay-card{transform:none;opacity:1}
.overlay-icon{
  width:72px;height:72px;margin:0 auto 16px;border-radius:22px;
  display:grid;place-items:center;
  background:rgba(255,207,112,.12);
  border:1px solid rgba(255,207,112,.32);
  color:var(--brand-3);
  box-shadow:0 0 40px rgba(255,207,112,.18);
}
.overlay-icon svg{width:32px;height:32px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.overlay-title{font-size:22px;font-weight:850;letter-spacing:-.2px}
.overlay-desc{color:var(--ink-2);font-size:14px;margin:8px 0 22px}
.overlay-actions{display:flex;flex-direction:column;gap:10px}
.pause-float{
  position:fixed;
  right:max(14px,var(--sa-r));
  bottom:calc(16px + var(--sa-b));
  z-index:300;
  width:var(--tap);height:var(--tap);
  border-radius:16px;
  display:none;
  place-items:center;
  background:rgba(16,23,49,.8);
  border:1px solid var(--line-2);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  color:var(--ink);
  box-shadow:var(--sh-2);
  transition:transform var(--dur-1) var(--ease-spring);
}
.pause-float svg{width:20px;height:20px;fill:currentColor}
body.is-playing .pause-float{display:grid}
body.has-pause .pause-float{display:grid}
.pause-float:active{transform:scale(.9)}

/* --------------------------------------------------------------------------
   9. Toast
   -------------------------------------------------------------------------- */
.toast-stack{
  position:fixed;
  left:50%;
  bottom:calc(22px + var(--sa-b));
  transform:translateX(-50%);
  z-index:900;
  display:flex;flex-direction:column;align-items:center;gap:10px;
  width:max-content;max-width:calc(100% - 28px);
  pointer-events:none;
}
.toast{
  pointer-events:auto;
  display:flex;align-items:center;gap:10px;
  max-width:min(440px,92vw);
  padding:12px 16px;
  border-radius:16px;
  background:rgba(22,29,58,.94);
  border:1px solid rgba(255,255,255,.14);
  color:var(--ink);
  font-size:14px;font-weight:600;
  box-shadow:0 18px 46px rgba(0,0,0,.45),inset 0 1px 0 rgba(255,255,255,.07);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  transform:translateY(18px) scale(.94);
  opacity:0;
  transition:transform var(--dur-3) var(--ease-spring),opacity var(--dur-2);
}
.toast.is-show{transform:none;opacity:1}
.toast.is-out{transform:translateY(-6px) scale(.97);opacity:0}
.toast-ic{width:22px;height:22px;border-radius:7px;display:grid;place-items:center;flex-shrink:0;background:rgba(124,108,255,.25);color:#d6d0ff}
.toast-ic svg{width:14px;height:14px;stroke:currentColor;fill:none;stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}
.toast-msg{line-height:1.45}
.toast--success .toast-ic{background:rgba(61,220,151,.2);color:#8df3c4}
.toast--warn .toast-ic{background:rgba(255,189,74,.2);color:#ffd99a}
.toast--error .toast-ic{background:rgba(255,107,107,.2);color:#ffb0b0}

/* --------------------------------------------------------------------------
   10. Footer
   -------------------------------------------------------------------------- */
.site-footer{
  margin-top:auto;
  border-top:1px solid var(--line);
  background:rgba(4,6,13,.35);
  padding:26px 0 calc(26px + var(--sa-b));
}
html[data-theme="day"] .site-footer{background:rgba(255,255,255,.4)}
.footer-grid{display:flex;justify-content:space-between;gap:22px;flex-wrap:wrap}
.footer-brand{font-weight:800;font-size:15px}
.footer-desc{font-size:12.5px;color:var(--ink-3);max-width:42ch;margin-top:6px}
.footer-links{display:flex;gap:8px;flex-wrap:wrap}
.footer-links a{
  display:inline-flex;align-items:center;min-height:40px;padding:0 12px;border-radius:11px;
  font-size:13px;font-weight:600;color:var(--ink-2);
  transition:background var(--dur-2),color var(--dur-2);
}
@media (hover:hover){.footer-links a:hover{background:rgba(255,255,255,.06);color:var(--ink)}}
.footer-bottom{margin-top:18px;font-size:11.5px;color:var(--ink-3);display:flex;gap:14px;flex-wrap:wrap;justify-content:space-between}

/* ad slot (placeholder only — never loads scripts) */
.ad-slot{
  min-height:90px;
  border-radius:var(--radius);
  border:1px dashed rgba(255,255,255,.16);
  background:repeating-linear-gradient(135deg,rgba(255,255,255,.018) 0 10px,transparent 10px 20px);
  display:grid;place-items:center;
  color:var(--ink-3);
  font-size:11px;font-weight:700;letter-spacing:2px;text-transform:uppercase;
  margin:22px 0;
}

/* --------------------------------------------------------------------------
   11. Haptic flash ring / generic effect classes
   -------------------------------------------------------------------------- */
.site-haptic-flash{box-shadow:0 0 0 3px rgba(124,108,255,.55),0 0 30px rgba(124,108,255,.45)!important}
.pop{animation:pop var(--dur-3) var(--ease-spring)}
@keyframes pop{0%{transform:scale(.86)}60%{transform:scale(1.06)}100%{transform:scale(1)}}
.shake{animation:shake .42s var(--ease)}
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-7px)}40%{transform:translateX(6px)}60%{transform:translateX(-4px)}80%{transform:translateX(3px)}}
.float-up{animation:floatUp .7s var(--ease-out) both}
@keyframes floatUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
.reveal{opacity:0;transform:translateY(18px);transition:opacity var(--dur-4) var(--ease-out),transform var(--dur-4) var(--ease-out)}
.reveal.is-in{opacity:1;transform:none}
.fx-shine{position:relative;overflow:hidden}
.fx-shine::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(110deg,transparent 35%,rgba(255,255,255,.18) 50%,transparent 65%);
  transform:translateX(-130%);
}
.fx-shine.is-shine::after{animation:shineOnce 900ms var(--ease-out)}
@keyframes shineOnce{to{transform:translateX(130%)}}

/* --------------------------------------------------------------------------
   12. Game shell (moved to assets/css/games.css — loaded by game pages only)
   -------------------------------------------------------------------------- */
.game-shell{display:flex;flex-direction:column;gap:14px;touch-action:manipulation}
.board-wrap{display:grid;place-items:center;width:100%}

/* --------------------------------------------------------------------------
   13. Utilities — spacing
   -------------------------------------------------------------------------- */
.mt-0{margin-top:0}.mt-1{margin-top:8px}.mt-2{margin-top:14px}.mt-3{margin-top:20px}.mt-4{margin-top:28px}
.mb-1{margin-bottom:8px}.mb-2{margin-bottom:14px}.mb-3{margin-bottom:20px}
.gap-1{gap:8px}.gap-2{gap:14px}.gap-3{gap:20px}
.hide-sm{display:initial}
@media (max-width:600px){.hide-sm{display:none}}
/* small tablets / split view: keep feature strip single column */
@media (max-width:700px){.feature-strip{grid-template-columns:1fr}}
.full{width:100%}

/* --------------------------------------------------------------------------
   14. Home page
   -------------------------------------------------------------------------- */
.hero{
  position:relative;
  padding:clamp(22px,5vw,54px) 0 10px;
  overflow:hidden;
}
.hero-kicker{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px 6px 8px;
  border-radius:999px;
  border:1px solid rgba(255,207,112,.28);
  background:rgba(255,207,112,.08);
  color:#ffe1a6;
  font-size:11.5px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;
}
.hero-kicker .dot{width:18px;height:18px;border-radius:50%;display:grid;place-items:center;background:rgba(255,207,112,.2)}
.hero-kicker .dot::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--brand-3);box-shadow:0 0 10px var(--brand-3);animation:tbPulse 1.6s infinite}
.hero-title{
  margin:16px 0 14px;
  font-size:clamp(34px,8.4vw,64px);
  line-height:1.05;
  font-weight:900;
  letter-spacing:-1.6px;
  max-width:18ch;
}
.hero-title .line{display:block;padding:.06em 0}
.hero-title .line > span{display:inline-block}
.hero-title .line > span{display:inline-block;animation:titleRise .9s var(--ease-out) both}
.hero-title .line:nth-child(2) > span{animation-delay:.1s}
.hero-title .line:nth-child(3) > span{animation-delay:.2s}
@keyframes titleRise{from{transform:translateY(105%);opacity:0}to{transform:none;opacity:1}}
.hero-title .grad{
  background:linear-gradient(92deg,#a79bff 0%,#22d3ee 45%,#ffcf70 100%);
  background-size:200% 100%;
  -webkit-background-clip:text;background-clip:text;color:transparent;
  animation:titleRise .9s var(--ease-out) both,gradPan 8s linear infinite;
}
@keyframes gradPan{to{background-position:200% 0}}
.hero-lead{
  color:var(--ink-2);
  font-size:clamp(14.5px,3.7vw,17px);
  max-width:56ch;
  animation:floatUp .9s .25s var(--ease-out) both;
}
.hero-meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px;animation:floatUp .9s .35s var(--ease-out) both}
.hero-orb{
  position:absolute;right:-60px;top:10px;width:260px;height:260px;border-radius:50%;
  border:1px solid rgba(255,255,255,.12);
  display:none;
}
@media (min-width:900px){.hero-orb{display:block}}
.hero-orb::before,.hero-orb::after{content:"";position:absolute;border-radius:50%;border:1px solid rgba(255,255,255,.08)}
.hero-orb::before{inset:32px}
.hero-orb::after{inset:64px;border-color:rgba(255,207,112,.25);animation:spin 18s linear infinite}
.hero-orb .sat{
  position:absolute;left:50%;top:-7px;width:14px;height:14px;margin-left:-7px;border-radius:50%;
  background:var(--brand-3);box-shadow:0 0 22px var(--brand-3);
  transform-origin:7px 137px;animation:spin 9s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}

/* search + tabs toolbar */
.toolbar{
  position:sticky;
  top:calc(60px + var(--sa-t));
  margin-top:8px;
  z-index:90;
  margin:8px 0 0;
  padding:12px max(0px,calc(var(--sa-l) - 16px)) 12px max(0px,calc(var(--sa-r) - 16px));
  border-radius:0 0 18px 18px;
  background:linear-gradient(180deg,rgba(8,11,20,.92),rgba(8,11,20,.72));
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}
html[data-theme="day"] .toolbar{background:linear-gradient(180deg,rgba(247,248,253,.94),rgba(247,248,253,.8))}
.toolbar-inner{max-width:var(--maxw);margin:0 auto;display:flex;flex-direction:column;gap:10px}
.search{
  position:relative;
  display:flex;align-items:center;
}
.search svg{position:absolute;left:15px;width:19px;height:19px;stroke:var(--ink-3);fill:none;stroke-width:2;stroke-linecap:round;pointer-events:none}
.search input{
  width:100%;
  min-height:var(--tap);
  padding:10px 52px 10px 44px;
  border-radius:16px;
  border:1px solid var(--line-2);
  background:rgba(0,0,0,.25);
  color:var(--ink);
  font-size:16px;
  transition:border-color var(--dur-2),box-shadow var(--dur-2),background var(--dur-2);
}
html[data-theme="day"] .search input{background:rgba(255,255,255,.9)}
.search input::placeholder{color:var(--ink-3)}
.search input:focus{outline:none;border-color:rgba(124,108,255,.7);box-shadow:0 0 0 4px rgba(124,108,255,.16)}
.search .search-clear{
  position:absolute;right:4px;width:44px;height:44px;display:none;place-items:center;border-radius:12px;color:var(--ink-3);
}
.search .search-clear svg{position:static;left:auto;width:16px;height:16px;stroke:currentColor;fill:none}
.search.has-value .search-clear{display:grid}
.tabs{
  display:flex;
  gap:6px;
  overflow-x:auto;
  scrollbar-width:none;
  -webkit-overflow-scrolling:touch;
  padding-bottom:2px;
  mask-image:linear-gradient(90deg,#000 92%,transparent);
  -webkit-mask-image:linear-gradient(90deg,#000 92%,transparent);
}
.tabs::-webkit-scrollbar{display:none}
.tab{
  flex:0 0 auto;
  min-height:42px;
  padding:0 15px;
  border-radius:13px;
  border:1px solid transparent;
  color:var(--ink-2);
  font-size:13.5px;font-weight:750;
  display:inline-flex;align-items:center;gap:7px;
  transition:color var(--dur-2),background var(--dur-2),border-color var(--dur-2),transform var(--dur-1) var(--ease-spring);
}
.tab .tab-n{font-size:11px;font-weight:800;padding:1px 7px;border-radius:999px;background:rgba(255,255,255,.08);color:var(--ink-3)}
.tab:active{transform:scale(.96)}
.tab[aria-selected="true"]{
  color:#fff;background:rgba(124,108,255,.16);border-color:rgba(124,108,255,.4);
  box-shadow:0 0 20px rgba(124,108,255,.18);
}
.tab[aria-selected="true"] .tab-n{background:rgba(124,108,255,.35);color:#e3ddff}

.result-line{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  margin:16px 0 12px;
  font-size:13px;color:var(--ink-3);
}
.result-line strong{color:var(--ink-2)}

/* grid of cards */
.grid{
  display:grid;
  gap:14px;
  grid-template-columns:repeat(auto-fill,minmax(min(100%,250px),1fr));
}
@media (max-width:520px){.grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}}

.gcard{
  position:relative;
  display:flex;
  flex-direction:column;
  min-height:100%;
  padding:16px;
  border-radius:22px;
  border:var(--card-bd);
  background:var(--card-bg);
  box-shadow:var(--sh-1),inset 0 1px 0 rgba(255,255,255,.05);
  overflow:hidden;
  isolation:isolate;
  color:var(--ink);
  transition:transform var(--dur-2) var(--ease-out),box-shadow var(--dur-3),border-color var(--dur-2);
  animation:cardIn .6s var(--ease-out) both;
  animation-delay:var(--d,0ms);
}
@keyframes cardIn{from{opacity:0;transform:translateY(18px) scale(.98)}to{opacity:1;transform:none}}
.gcard::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:radial-gradient(240px 160px at 100% 0%,var(--accent-soft,rgba(124,108,255,.22)),transparent 70%);
  opacity:.9;
  transition:opacity var(--dur-3),transform var(--dur-3);
}
.gcard::after{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,transparent,var(--accent,var(--brand)),transparent);
  opacity:0;transition:opacity var(--dur-2);
}
.gcard:active{transform:scale(.975)}
@media (hover:hover){
  .gcard:hover{transform:translateY(-4px);border-color:rgba(255,255,255,.18);box-shadow:var(--sh-2),0 0 0 1px rgba(255,255,255,.06);color:var(--ink)}
  .gcard:hover::before{transform:scale(1.15);opacity:1}
  .gcard:hover::after{opacity:1}
  .gcard:hover .gc-go{transform:translateX(4px);opacity:1}
  .gcard:hover .gc-icon{transform:rotate(-6deg) scale(1.06)}
}
.gc-top{display:flex;align-items:flex-start;justify-content:space-between;gap:8px;margin-bottom:14px}
.gc-icon{
  width:46px;height:46px;border-radius:15px;color:var(--accent-text,var(--ink));
  display:grid;place-items:center;
  font-size:24px;line-height:1;
  background:linear-gradient(150deg,var(--accent-soft2,rgba(124,108,255,.3)),rgba(255,255,255,.04));
  border:1px solid rgba(255,255,255,.14);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.2),0 8px 20px rgba(0,0,0,.25);
  transition:transform var(--dur-3) var(--ease-spring);
  flex-shrink:0;
}
.gc-badge{
  font-size:10px;font-weight:800;letter-spacing:1px;text-transform:uppercase;
  padding:4px 9px;border-radius:999px;
  border:1px solid var(--accent-line,rgba(124,108,255,.4));
  color:var(--accent-text,#cfc9ff);
  background:var(--accent-soft,rgba(124,108,255,.14));
  white-space:nowrap;
}
.gc-name{font-size:16.5px;font-weight:800;letter-spacing:-.2px;line-height:1.25}
.gc-en{display:block;font-size:11px;font-weight:600;letter-spacing:.6px;color:var(--ink-3);margin-top:3px}
.gc-desc{font-size:12.5px;color:var(--ink-2);line-height:1.5;margin-top:8px;flex:1}
.gc-foot{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:14px}
.gc-tags{display:flex;gap:5px;flex-wrap:wrap}
.gc-tag{font-size:10.5px;font-weight:700;color:var(--ink-3);padding:2px 7px;border-radius:6px;background:rgba(255,255,255,.05)}
.gc-go{
  display:inline-flex;align-items:center;gap:4px;
  font-size:12.5px;font-weight:800;color:var(--accent-text,var(--brand-2));
  opacity:.75;
  transition:transform var(--dur-2) var(--ease),opacity var(--dur-2);
  flex-shrink:0;
}
.gc-go svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
@media (max-width:520px){
  .grid{grid-template-columns:1fr;gap:10px}
  .gcard{padding:14px;border-radius:19px;display:grid;grid-template-columns:auto minmax(0,1fr);grid-template-areas:"icon top" "icon name" "desc desc" "foot foot";column-gap:12px;align-items:center}
  .gc-top{grid-area:top;margin-bottom:0;justify-content:flex-start}
  .gc-top .gc-icon{display:grid}
  .gc-top .gc-icon{display:none}
  .gc-name{grid-area:name}
  .gc-icon{grid-area:icon;align-self:start;width:52px;height:52px;font-size:26px}
  .gc-desc{grid-area:desc;margin-top:10px;font-size:12.5px;-webkit-line-clamp:2}
  .gc-foot{grid-area:foot;margin-top:10px}
  .gc-go{display:inline-flex}
  .gc-badge{font-size:9.5px}
}
@media (max-width:360px){
  .gc-icon{width:46px;height:46px;font-size:23px}
  .gc-icon{width:40px;height:40px;border-radius:13px;font-size:21px}
  .gc-name{font-size:14.5px}
  .gc-en{font-size:9.5px;letter-spacing:.2px}
  .gc-desc{font-size:12.5px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
}

/* accent variants */
.a-violet{--accent:#7c6cff;--accent-soft:rgba(124,108,255,.18);--accent-soft2:rgba(124,108,255,.32);--accent-line:rgba(124,108,255,.45);--accent-text:#c9c2ff}
.a-cyan{--accent:#22d3ee;--accent-soft:rgba(34,211,238,.14);--accent-soft2:rgba(34,211,238,.3);--accent-line:rgba(34,211,238,.4);--accent-text:#a9efff}
.a-gold{--accent:#ffcf70;--accent-soft:rgba(255,207,112,.14);--accent-soft2:rgba(255,207,112,.32);--accent-line:rgba(255,207,112,.4);--accent-text:#ffe1a6}
.a-pink{--accent:#ff6f9c;--accent-soft:rgba(255,111,156,.15);--accent-soft2:rgba(255,111,156,.32);--accent-line:rgba(255,111,156,.4);--accent-text:#ffc2d4}
.a-green{--accent:#3ddc97;--accent-soft:rgba(61,220,151,.14);--accent-soft2:rgba(61,220,151,.3);--accent-line:rgba(61,220,151,.4);--accent-text:#a9f3cf}
.a-blue{--accent:#5b8cff;--accent-soft:rgba(91,140,255,.16);--accent-soft2:rgba(91,140,255,.32);--accent-line:rgba(91,140,255,.42);--accent-text:#bdd0ff}

/* course-mode ribbon card */
.feature-strip{
  margin-top:26px;
  display:grid;
  gap:12px;
  grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));
}
.feature{
  display:flex;align-items:flex-start;gap:12px;
  padding:16px;
  border-radius:20px;
  border:1px solid var(--line);
  background:linear-gradient(160deg,rgba(255,255,255,.055),rgba(255,255,255,.018));
  transition:transform var(--dur-2) var(--ease-out),border-color var(--dur-2);
}
@media (hover:hover){.feature:hover{transform:translateY(-3px);border-color:rgba(255,255,255,.16)}}
.feature-ic{
  width:42px;height:42px;flex-shrink:0;border-radius:13px;display:grid;place-items:center;
  background:rgba(124,108,255,.15);border:1px solid rgba(124,108,255,.3);
}
.feature-ic svg{width:20px;height:20px;stroke:#c9c2ff;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.feature h3{font-size:14.5px;font-weight:800;margin-bottom:3px}
.feature p{font-size:12.5px;color:var(--ink-2);line-height:1.5}

.empty{
  grid-column:1/-1;
  text-align:center;
  padding:46px 16px;
  border-radius:22px;
  border:1px dashed var(--line-2);
  color:var(--ink-3);
}
.empty .empty-emoji{font-size:38px;margin-bottom:10px}
.empty h3{color:var(--ink-2);font-size:16px;font-weight:800;margin-bottom:4px}

/* classroom banner on home */
.class-banner{
  margin-top:18px;
  display:flex;align-items:center;gap:12px;
  padding:14px 16px;
  border-radius:20px;
  border:1px solid rgba(255,207,112,.28);
  background:linear-gradient(120deg,rgba(255,207,112,.10),rgba(124,108,255,.08));
}
.class-banner .cb-ic{width:40px;height:40px;border-radius:13px;display:grid;place-items:center;background:rgba(255,207,112,.16);flex-shrink:0}
.class-banner .cb-ic svg{width:20px;height:20px;stroke:#ffe1a6;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.class-banner .cb-text{flex:1;min-width:0}
.class-banner .cb-text b{display:block;font-size:13.5px}
.class-banner .cb-text span{font-size:12px;color:var(--ink-3);display:block;line-height:1.4}

/* --------------------------------------------------------------------------
   15. Settings sheet
   -------------------------------------------------------------------------- */
.sheet{
  position:fixed;inset:0;z-index:420;
  display:flex;justify-content:flex-end;
  opacity:0;visibility:hidden;
  transition:opacity var(--dur-3),visibility var(--dur-3);
}
.sheet.is-open{opacity:1;visibility:visible}
.sheet-scrim{position:absolute;inset:0;background:rgba(5,8,16,.6);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.sheet-panel{
  position:relative;
  width:min(420px,100%);
  height:100%;
  overflow-y:auto;
  overscroll-behavior:contain;
  -webkit-overflow-scrolling:touch;
  padding:calc(var(--sa-t) + 16px) max(18px,var(--sa-r)) calc(28px + var(--sa-b)) 18px;
  background:linear-gradient(175deg,#151d3d,#0a0e1f 70%);
  border-left:1px solid rgba(255,255,255,.1);
  box-shadow:-30px 0 80px rgba(0,0,0,.5);
  transform:translateX(104%);
  transition:transform var(--dur-4) var(--ease-out);
}
.sheet.is-open .sheet-panel{transform:none}
.sheet-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:18px}
.sheet-title{font-size:20px;font-weight:850;letter-spacing:-.2px}
.sheet-sub{font-size:12px;color:var(--ink-3);margin-top:2px}
.set-group{margin-bottom:20px}
.set-label{font-size:11px;font-weight:800;letter-spacing:1.6px;text-transform:uppercase;color:var(--ink-3);margin-bottom:8px;padding-left:4px}
.set-item{
  display:flex;align-items:center;gap:12px;
  min-height:64px;
  padding:12px 14px;
  border-radius:16px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  margin-bottom:8px;
}
.set-item .si-ic{width:34px;height:34px;border-radius:11px;display:grid;place-items:center;background:rgba(255,255,255,.06);flex-shrink:0}
.set-item .si-ic svg{width:18px;height:18px;stroke:var(--ink-2);fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.set-item .si-text{flex:1;min-width:0}
.set-item .si-title{font-size:14.5px;font-weight:750;line-height:1.3;display:block;text-align:left}
.set-item .si-desc{font-size:11.5px;color:var(--ink-3);line-height:1.4;display:block;margin-top:2px;text-align:left}
.set-item .switch{pointer-events:none}
.set-item button.si-hit{position:absolute;inset:0;opacity:0}
.set-row{display:flex;gap:8px}
.set-lang{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.set-lang button{
  min-height:56px;border-radius:16px;border:1px solid var(--line-2);
  background:rgba(255,255,255,.04);
  font-weight:800;font-size:14px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  transition:background var(--dur-2),border-color var(--dur-2),transform var(--dur-1);
}
.set-lang button small{font-size:10.5px;font-weight:600;color:var(--ink-3);letter-spacing:2px}
.set-lang button[aria-pressed="true"]{border-color:rgba(124,108,255,.6);background:linear-gradient(150deg,rgba(124,108,255,.28),rgba(34,211,238,.16));box-shadow:0 0 24px rgba(124,108,255,.22)}
.set-lang button:active{transform:scale(.97)}
.range-row{display:flex;align-items:center;gap:12px;padding:6px 4px 2px}
.range-row input[type="range"]{
  -webkit-appearance:none;appearance:none;flex:1;height:32px;background:transparent;
}
.range-row input[type="range"]::-webkit-slider-runnable-track{height:6px;border-radius:99px;background:linear-gradient(90deg,var(--brand),var(--brand-2)) no-repeat,rgba(255,255,255,.1);background-size:var(--p,60%) 100%}
.range-row input[type="range"]::-webkit-slider-thumb{-webkit-appearance:none;width:26px;height:26px;border-radius:50%;background:#fff;margin-top:-10px;box-shadow:0 2px 10px rgba(0,0,0,.4),0 0 0 4px rgba(124,108,255,.3);cursor:pointer}
.range-row input[type="range"]::-moz-range-track{height:6px;border-radius:99px;background:rgba(255,255,255,.1)}
.range-row input[type="range"]::-moz-range-thumb{width:24px;height:24px;border:0;border-radius:50%;background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.4)}
.range-val{font-family:var(--font-num);font-size:13px;font-weight:700;color:var(--ink-2);width:38px;text-align:right}
.sheet-note{font-size:11.5px;color:var(--ink-3);line-height:1.55;padding:0 4px}
.sheet-links{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:6px}
.sheet-links a{
  min-height:48px;display:flex;align-items:center;justify-content:center;gap:6px;border-radius:14px;
  border:1px solid var(--line);background:rgba(255,255,255,.04);font-size:13px;font-weight:700;color:var(--ink-2);
}

/* --------------------------------------------------------------------------
   16. Content pages (about / privacy / text-adventure prose)
   -------------------------------------------------------------------------- */
.prose{font-size:15px;line-height:1.75;color:var(--ink-2)}
.prose h2{font-size:20px;font-weight:850;color:var(--ink);margin:28px 0 10px;letter-spacing:-.2px;display:flex;align-items:center;gap:9px}
.prose h2 .n{font-family:var(--font-num);font-size:12px;color:var(--brand-3);padding:2px 8px;border-radius:8px;background:rgba(255,207,112,.12);border:1px solid rgba(255,207,112,.25)}
.prose h3{font-size:15.5px;font-weight:800;color:var(--ink);margin:18px 0 6px}
.prose p{margin:0 0 10px}
.prose ul{margin:0 0 12px;padding-left:0;display:flex;flex-direction:column;gap:6px}
.prose li{padding-left:22px;position:relative}
.prose li::before{content:"";position:absolute;left:4px;top:.72em;width:6px;height:6px;border-radius:50%;background:var(--brand-2);opacity:.7}
.prose strong{color:var(--ink)}
.prose a{text-decoration:underline;text-underline-offset:3px;text-decoration-color:rgba(34,211,238,.4)}
.prose-card{padding:22px clamp(16px,4vw,30px)}
.toc{display:flex;gap:6px;flex-wrap:wrap;margin:14px 0 4px}
.toc a{min-height:36px;display:inline-flex;align-items:center;padding:0 12px;border-radius:10px;background:rgba(255,255,255,.05);border:1px solid var(--line);font-size:12.5px;font-weight:700;color:var(--ink-2)}

/* --------------------------------------------------------------------------
   17. Page transitions
   -------------------------------------------------------------------------- */
@keyframes pageIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
/* the transition is applied to the content wrapper only; .main is NOT transformed so that
   position:sticky (which WebKit/Blink disable inside transformed ancestors) keeps working */
.main-tight{animation:none}
.main > .wrap:first-child{animation:pageIn .45s var(--ease-out) both}
.main > .hero:first-child{animation:pageIn .45s var(--ease-out) both}

/* --------------------------------------------------------------------------
   18. Responsive touches
   -------------------------------------------------------------------------- */
@media (max-width:360px){
  .lang-switch .lang-alt,.lang-switch .lang-sep{display:none}
  .lang-switch{min-width:58px}
  .top-actions{gap:4px}
  .icon-btn{width:44px;height:46px}
  .brand-name{font-size:16px}
  .brand-sub{display:none}
}
@media (max-width:380px){
  .brand-sub{display:none}
  .topbar-inner{height:56px;gap:8px}
  .lang-switch{min-width:70px;padding:0 10px}
  .icon-btn{width:44px;height:46px;border-radius:14px}
  .top-actions{gap:4px}
  .search input,.input,.select{font-size:16px}
  .toast{font-size:13px}
}
@media (min-width:768px){
  :root{--gap:16px}
  .card{padding:22px}
  .section{padding:34px 0}
}
@media (min-width:1100px){
  .grid{grid-template-columns:repeat(auto-fill,minmax(262px,1fr));gap:16px}
  .feature-strip{grid-template-columns:repeat(3,minmax(0,1fr))}
}

/* landscape phones — compact */
@media (max-height:520px) and (orientation:landscape){
  .toolbar{position:static}
  .hero{padding-top:12px}
  .hero-title{font-size:30px}
}

/* print */
@media print{
  body::before,body::after,.topbar,.site-footer,.ad-slot,.pause-float,.toast-stack,.sheet,.overlay{display:none!important}
  body{background:#fff;color:#000}
}

/* --------------------------------------------------------------------------
   19. Session additions — game-state freeze, modal guard, misc hooks
   -------------------------------------------------------------------------- */
body.is-frozen .game-shell{pointer-events:none}
body.is-modal-open .pause-float{opacity:.25;pointer-events:none}
.overlay .overlay-card{position:relative;z-index:1}
.sheet.is-open ~ .pause-float{opacity:.25;pointer-events:none}

/* keypad (guess-number etc. — full styles in games.css) */
.keypad{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:8px;
}
.keypad .key{
  min-height:58px;
  border-radius:16px;
  border:1px solid var(--line-2);
  background:rgba(255,255,255,.055);
  font-family:var(--font-num);
  font-size:22px;
  font-weight:700;
  display:grid;
  place-items:center;
  -webkit-user-select:none;user-select:none;
  transition:transform 90ms var(--ease),background var(--dur-1),box-shadow var(--dur-1);
}
.keypad .key:active{transform:scale(.93);background:rgba(124,108,255,.22);box-shadow:0 0 0 2px rgba(124,108,255,.35)}
.keypad .key--action{background:var(--grad-brand);border-color:transparent;color:#fff;font-size:15px;font-family:var(--font)}
.keypad .key--ghost{font-family:var(--font);font-size:15px;color:var(--ink-2)}

/* progress bars */
.progress{
  height:8px;border-radius:99px;background:rgba(255,255,255,.1);overflow:hidden;position:relative;
}
.progress > span{
  display:block;height:100%;width:0;border-radius:inherit;
  background:var(--grad-brand);
  transition:width var(--dur-3) var(--ease-out);
  position:relative;
}
.progress > span::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.45),transparent);
  transform:translateX(-100%);animation:barShine 1.8s var(--ease) infinite;
}
@keyframes barShine{to{transform:translateX(100%)}}

/* result pieces */
.result-big{
  font-family:var(--font-num);
  font-size:clamp(30px,9vw,48px);
  font-weight:900;letter-spacing:-1.5px;line-height:1.1;
  background:var(--grad-gold);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.rating{
  display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:999px;
  font-size:12px;font-weight:800;letter-spacing:.4px;
  background:rgba(255,207,112,.12);border:1px solid rgba(255,207,112,.3);color:#ffe1a6;
}

/* small tool grid for tool pages */
.tg{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr))}
.tg > .card{display:flex;flex-direction:column}

/* result list rows */
.list{display:flex;flex-direction:column;gap:6px}
.list-row{
  display:flex;align-items:center;gap:10px;
  min-height:44px;padding:6px 10px;border-radius:12px;
  background:rgba(255,255,255,.03);border:1px solid var(--line);
  font-size:13.5px;
}
.list-row .lr-dot{width:8px;height:8px;border-radius:50%;background:var(--brand-2);flex-shrink:0}
.list-row .lr-main{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.list-row .lr-val{font-family:var(--font-num);font-weight:800;font-variant-numeric:tabular-nums}

/* neutral confirmation of hovers on touch devices */
@media (hover:none){
  .gcard:hover{transform:none}
}

/* --------------------------------------------------------------------------
   20. Home page extra (browse header, keyboard hint, chip filters)
   -------------------------------------------------------------------------- */
.home-head{padding-top:clamp(26px,6vw,48px)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:14px}
.section-title{font-size:clamp(20px,4.6vw,26px);font-weight:850;letter-spacing:-.4px}
.section-sub{font-size:13px;color:var(--ink-3);margin-top:2px}
.link-more{
  display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:0 12px;border-radius:12px;
  font-size:13px;font-weight:750;color:var(--brand-2);border:1px solid rgba(34,211,238,.25);background:rgba(34,211,238,.07);
}
.link-more svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}

.class-toggle-card{
  display:flex;align-items:center;gap:14px;
  padding:16px 18px;border-radius:22px;
  background:linear-gradient(120deg,rgba(124,108,255,.16),rgba(34,211,238,.08));
  border:1px solid rgba(124,108,255,.3);
  box-shadow:0 0 0 1px rgba(124,108,255,.08),0 18px 40px rgba(0,0,0,.25);
}
.class-toggle-card .ctc-ic{width:46px;height:46px;border-radius:15px;display:grid;place-items:center;background:rgba(124,108,255,.22);border:1px solid rgba(124,108,255,.35);flex-shrink:0}
.class-toggle-card .ctc-ic svg{width:22px;height:22px;stroke:#d6d0ff;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.class-toggle-card .ctc-text{flex:1;min-width:0}
.class-toggle-card .ctc-text b{display:block;font-size:14.5px;line-height:1.3}
.class-toggle-card .ctc-text span{font-size:12px;color:var(--ink-2);line-height:1.45;display:block;margin-top:2px}

/* fade-in list for filtered results */
.gcard.is-filtering{animation:filterIn .4s var(--ease-out)}
@keyframes filterIn{from{opacity:0;transform:scale(.97) translateY(8px)}to{opacity:1;transform:none}}

/* keyboard hint */
.kb-hint{display:none}
@media (hover:hover) and (pointer:fine){
  .kb-hint{display:inline-flex;align-items:center;gap:6px;font-size:11.5px;color:var(--ink-3)}
}

/* --------------------------------------------------------------------------
   21. iPad / tablet & landscape refinements
   -------------------------------------------------------------------------- */
@media (min-width:768px) and (max-width:1024px){
  .topbar-inner{height:64px}
  .toolbar{top:calc(64px + var(--sa-t))}
  .hero-title{max-width:16ch}
  .grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .feature-strip .feature{padding:12px;gap:9px}
  .feature-strip .feature-ic{width:34px;height:34px;border-radius:11px}
  .feature-strip .feature h3{font-size:13px}
  .feature-strip .feature p{font-size:11.5px}
}
@media (orientation:landscape) and (min-width:1024px){
  .hero{padding:40px 0 14px}
}
@media (prefers-reduced-motion: reduce){
  .hero-title .grad{animation:none;color:#b9b1ff}
  .brand-mark::after{display:none}
  .progress > span::after{display:none}
}
/* retina 0.5px hairlines */
@media (-webkit-min-device-pixel-ratio:2),(min-resolution:2dppx){
  .card,.gcard,.topbar{border-width:.5px}
}
/* text selection off on interactive game surfaces */
.board,.keypad,.tabs,.seg,.player-card,.stat{-webkit-user-select:none;user-select:none}
/* when classroom mode is on, flag it visually on the top bar */
body.is-classroom [data-action="classroom"]{animation:classPulse 3s var(--ease) infinite}
@keyframes classPulse{0%,100%{box-shadow:0 0 0 0 rgba(255,207,112,.0)}50%{box-shadow:0 0 0 4px rgba(255,207,112,.10)}}
/* safe area for fixed bottom bars inside games */
.safe-bottom{padding-bottom:calc(12px + var(--sa-b))}
/* iOS momentum containment inside scroll areas */
.scroll-y{overflow-y:auto;overscroll-behavior:contain;-webkit-overflow-scrolling:touch}

/* --------------------------------------------------------------------------
   22. Tool page primitives (currency / tip / ddl / units)
   -------------------------------------------------------------------------- */
.seg-wrap{display:flex;justify-content:center}
.cur-main{
  display:grid;gap:10px;grid-template-columns:minmax(0,1fr) 48px minmax(0,1fr);
  align-items:center;
}
@media (max-width:520px){.cur-main{grid-template-columns:minmax(0,1fr) 48px minmax(0,1fr)}}
.cur-side{display:flex;flex-direction:column;gap:8px;min-width:0}
.cur-side .select{padding:10px 34px 10px 12px;font-weight:700}
.cur-side .input{font-family:var(--font-num);font-size:clamp(20px,6vw,28px);font-weight:800;text-align:right;letter-spacing:-.5px}
.cur-swap{
  width:48px;height:48px;border-radius:50%;
  display:grid;place-items:center;
  background:var(--grad-brand);color:#fff;
  box-shadow:0 8px 22px rgba(124,108,255,.4),inset 0 1px 0 rgba(255,255,255,.3);
  transition:transform var(--dur-3) var(--ease-spring);
}
.cur-swap svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.cur-swap:active{transform:rotate(180deg) scale(.92)}
.cur-swap.is-spin{animation:swapSpin .5s var(--ease-spring)}
@keyframes swapSpin{to{transform:rotate(180deg)}}
.cur-out{
  margin-top:14px;padding:16px;border-radius:18px;
  background:linear-gradient(150deg,rgba(124,108,255,.16),rgba(34,211,238,.08));
  border:1px solid rgba(124,108,255,.3);
  display:flex;align-items:center;justify-content:space-between;gap:10px;
}
.cur-out .co-val{font-family:var(--font-num);font-size:clamp(24px,7vw,34px);font-weight:900;letter-spacing:-1px;line-height:1.1;word-break:break-all}
.cur-out .co-cur{font-size:12px;color:var(--ink-3);letter-spacing:2px;font-weight:800}
.rate-row{display:grid;grid-template-columns:minmax(0,1fr) 112px;gap:8px;align-items:center}
.rate-row .rr-cur{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--ink-2)}
.rate-badge{font-family:var(--font-num);font-size:10px;padding:1px 6px;border-radius:6px;background:rgba(255,255,255,.07);color:var(--ink-3)}

/* split bill rows */
.split-row{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:15px;background:rgba(255,255,255,.035);border:1px solid var(--line)}
.split-row + .split-row{margin-top:8px}
.split-row .sr-label{font-size:13.5px;color:var(--ink-2);flex:1}
.split-row .sr-val{font-family:var(--font-num);font-weight:800;font-size:16px;font-variant-numeric:tabular-nums}
.split-row.is-hero{background:var(--grad-brand);border-color:transparent;box-shadow:0 12px 32px rgba(124,108,255,.35)}
.split-row.is-hero .sr-label{color:rgba(255,255,255,.85)}
.split-row.is-hero .sr-val{font-size:clamp(22px,6.5vw,28px);color:#fff}
.tip-pills{display:flex;gap:6px;flex-wrap:wrap}
.tip-pills button{min-height:40px;padding:0 14px;border-radius:12px;border:1px solid var(--line-2);font-weight:800;font-size:13.5px;font-family:var(--font-num);color:var(--ink-2);transition:all var(--dur-2)}
.tip-pills button[aria-pressed="true"]{background:rgba(255,207,112,.16);border-color:rgba(255,207,112,.5);color:#ffe1a6}
.stepper{display:flex;align-items:center;gap:8px}
.stepper button{width:48px;height:48px;border-radius:14px;border:1px solid var(--line-2);font-size:22px;font-weight:700;display:grid;place-items:center;background:rgba(255,255,255,.05)}
.stepper input{width:64px;text-align:center;font-size:18px;font-weight:800;font-family:var(--font-num);min-height:48px;padding:0}

/* timezone clocks */
.tz-grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr))}
.tz-card{padding:16px;border-radius:20px;border:1px solid var(--line);background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));position:relative;overflow:hidden}
.tz-card .tz-city{font-size:13px;font-weight:800;color:var(--ink-2);display:flex;align-items:center;gap:6px}
.tz-card .tz-time{font-family:var(--font-num);font-size:clamp(28px,8vw,38px);font-weight:800;letter-spacing:-1.5px;line-height:1.15;margin-top:6px;font-variant-numeric:tabular-nums}
.tz-card .tz-date{font-size:12px;color:var(--ink-3)}
.tz-card .tz-diff{position:absolute;right:14px;top:14px;font-size:11px;font-weight:800;padding:3px 9px;border-radius:999px;background:rgba(34,211,238,.12);color:#a9efff;border:1px solid rgba(34,211,238,.3)}
.tz-card.is-night{background:linear-gradient(160deg,rgba(124,108,255,.16),rgba(10,14,30,.4))}
.ddl-item{display:flex;align-items:center;gap:12px;padding:14px;border-radius:18px;border:1px solid var(--line);background:rgba(255,255,255,.04)}
.ddl-item + .ddl-item{margin-top:10px}
.ddl-item.is-over{opacity:.62;border-style:dashed}
.ddl-item .ddl-main{flex:1;min-width:0}
.ddl-item .ddl-name{font-weight:800;font-size:14.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ddl-item .ddl-when{font-size:12px;color:var(--ink-3)}
.ddl-item .ddl-left{font-family:var(--font-num);font-size:18px;font-weight:900;color:#ffe1a6;text-align:right;line-height:1.2;white-space:nowrap}
.ddl-item .ddl-left small{display:block;font-size:10px;color:var(--ink-3);font-weight:700;letter-spacing:1px;text-transform:uppercase}
.ddl-item.is-over .ddl-left{color:var(--ink-3)}
.ddl-bar{height:4px;border-radius:99px;background:rgba(255,255,255,.08);margin-top:8px;overflow:hidden}
.ddl-bar > i{display:block;height:100%;background:var(--grad-gold);border-radius:inherit;transition:width 1s linear}

/* unit */
.unit-tabs .seg button{min-width:0}
.unit-swap{display:flex;align-items:center;gap:8px}
.unit-swap .select{flex:1}
.unit-swap button{width:48px;height:48px;flex-shrink:0;border-radius:14px;border:1px solid var(--line-2);display:grid;place-items:center;background:rgba(255,255,255,.05)}
.unit-out{font-family:var(--font-num);font-size:clamp(26px,8vw,38px);font-weight:900;letter-spacing:-1px;line-height:1.15;word-break:break-all;background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;color:transparent}
.size-table{width:100%;border-collapse:collapse;font-size:13px;font-variant-numeric:tabular-nums}
.size-table th,.size-table td{padding:10px 8px;border-bottom:1px solid var(--line);text-align:center}
.size-table th{font-size:11px;letter-spacing:1px;text-transform:uppercase;color:var(--ink-3);font-weight:800}
.size-table td{font-family:var(--font-num)}
.size-table tr.is-hit td{background:rgba(124,108,255,.16)}

.quick-amounts{display:flex;gap:6px;flex-wrap:wrap}


/* filtered-out cards must never show (animation fill-mode can otherwise win) */
.gcard[hidden]{display:none !important;animation:none !important;opacity:1 !important}
.gcard.is-filtering{animation:filterIn .4s var(--ease-out)}
.gcard.is-filtering{animation:filterIn .4s var(--ease-out)}


/* --------------------------------------------------------------------------
   25. Top bar: always fits the viewport (home page included)
   -------------------------------------------------------------------------- */
@media (max-width:479px){
  .topbar-inner{flex-wrap:wrap;height:auto;padding-top:6px;padding-bottom:6px;row-gap:6px;overflow:visible}
  .topbar .brand{flex:1 1 100%;min-height:44px;padding-right:0}
  .topbar .brand-mark{width:30px;height:30px;border-radius:10px}
  .topbar .brand-mark svg{width:18px;height:18px}
  .topbar .brand-name{font-size:15px}
  .topbar .brand-sub{font-size:9px;letter-spacing:1.1px}
  .topbar .topbar-spacer{display:none}
  .topbar .top-actions{flex:1 1 100%;width:100%;gap:6px;justify-content:space-between}
  .topbar .top-actions .icon-btn{width:auto;flex:1 1 0;min-width:44px}
  .topbar .top-actions .lang-switch{flex:0 0 auto;min-width:84px}
  .toolbar{top:calc(var(--cp-topbar-h, 104px) + var(--sa-t))}
}
@media (min-width:480px) and (max-width:767px){
  .topbar-inner{height:60px;gap:8px}
  .topbar .brand-sub{display:none}
  .topbar .brand-name{font-size:16px}
  .topbar .icon-btn{width:44px;height:44px}
  .topbar .top-actions{gap:5px}
  .topbar .lang-switch{min-width:70px;padding:0 10px}
  .topbar .lang-switch .lang-alt{display:none}
  .topbar .lang-switch .lang-sep{display:none}
}


/* --------------------------------------------------------------------------
   26. Hard-guard: the top bar is never scrolled away, even past very long pages
   (sticky rendering can be dropped by a mid-sequence frame commit on some
   engines; after the sticky range the bar is switched to .is-pinned which
   keeps it fixed at the viewport top with an equivalent spacer.)
   -------------------------------------------------------------------------- */
.topbar-spacer-fix{display:block;width:100%;pointer-events:none}
.topbar.is-pinned{position:fixed;left:0;right:0;top:0;margin:0;width:100%;max-width:100%;box-shadow:0 10px 30px rgba(0,0,0,.35)}

/* settings rows: visible on/off value text next to the switch */
.set-item .si-state{font-size:12px;font-weight:800;letter-spacing:.4px;color:var(--ink-3);flex-shrink:0;min-width:26px;text-align:right}
.set-item.is-on .si-state{color:var(--brand-2)}

/* home filter: cards excluded by the search/category get this class (works even if a
   browser ignores inline display on these elements) */
#grid .gcard.is-out{display:none!important;animation:none!important}