:root{
  --navy:#0b2a6f;
  --accent:#ff6a13;
  --bg:#ffffff;
  --soft:#f4f6fb;           /* very light tint of navy */
  --line:rgba(11,42,111,.14);
  --r:20px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{background:var(--bg);color:var(--navy);overflow-x:hidden}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  min-height:100vh;line-height:1.4}
.top{max-width:1100px;margin:0 auto;padding:36px 24px 8px}
.top h1{margin:0;font-size:clamp(28px,5vw,40px);letter-spacing:-.02em;font-weight:800}
.top h1 span{color:var(--accent)}
.hint{margin:8px 0 0;font-size:15px;opacity:.7}
main{max-width:1100px;margin:0 auto;padding:8px 24px 24px}
section.grp{margin-top:32px}
section.grp h2{font-size:15px;font-weight:700;letter-spacing:.04em;margin:0 0 14px;display:flex;align-items:center;gap:10px}
section.grp h2::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--accent)}
section.grp h2 small{font-weight:500;opacity:.55;letter-spacing:0}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:12px}
.tile{
  position:relative;display:flex;align-items:center;justify-content:center;
  min-height:76px;aspect-ratio:1/0.82;padding:8px;
  background:var(--soft);color:var(--navy);border:2px solid transparent;border-radius:var(--r);
  font-weight:700;font-size:clamp(26px,3.4vw,34px);line-height:1;font-family:inherit;letter-spacing:-.01em;
  cursor:pointer;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;touch-action:manipulation;
  transition:transform .12s ease,background .15s,border-color .15s,color .15s;
  outline:none;
}
.tile .lc{font-weight:500;opacity:.55;margin-left:.16em}
.tile.long{font-size:clamp(20px,5.4vw,30px)}
.tile{min-width:0;white-space:nowrap}
.tile:hover{border-color:var(--line)}
.tile:focus-visible{border-color:var(--navy)}
.tile:active,.tile.press{transform:scale(.95);background:#e9edf7}
.tile.playing{background:var(--navy);color:#fff;border-color:var(--navy)}
.tile.playing .lc{opacity:.8}
.tile.playing::after{content:"";position:absolute;right:9px;top:9px;width:9px;height:9px;border-radius:50%;background:var(--accent);animation:pulse 1s ease-in-out infinite}
.tile .dot{position:absolute;left:50%;bottom:7px;transform:translateX(-50%);width:4px;height:4px;border-radius:50%;background:var(--accent);opacity:.0}
.tile.nomedia{opacity:.55}
@keyframes pulse{0%,100%{transform:scale(1);opacity:1}50%{transform:scale(1.6);opacity:.4}}
.tile *{pointer-events:none}
.foot{max-width:1100px;margin:24px auto 0;padding:24px 24px 40px;font-size:12px;opacity:.55;border-top:1px solid var(--line)}

/* long-press menu */
.menu{position:fixed;z-index:50;background:#fff;border-radius:18px;padding:6px;box-shadow:0 10px 40px rgba(11,42,111,.28),0 0 0 1px var(--line);display:flex;flex-direction:column;min-width:190px;animation:pop .14s ease-out}
.menu[hidden]{display:none}
.menu button{display:flex;align-items:center;gap:10px;min-height:56px;padding:0 16px;border:0;background:none;border-radius:13px;font-weight:600;font-size:16px;font-family:inherit;color:var(--navy);cursor:pointer;text-align:left}
.menu button:hover,.menu button:active{background:var(--soft)}
@keyframes pop{from{transform:scale(.92);opacity:0}to{transform:none;opacity:1}}
/* tiny css icons */
.ic{width:22px;height:22px;display:inline-block;position:relative;flex:none}
.ic-play::before{content:"";position:absolute;inset:0;border-radius:50%;background:var(--accent)}
.ic-play::after{content:"";position:absolute;left:8px;top:6px;border-left:8px solid #fff;border-top:5px solid transparent;border-bottom:5px solid transparent}
.ic-card::before{content:"";position:absolute;inset:2px 1px;border-radius:5px;border:2.5px solid var(--navy)}
.ic-card::after{content:"";position:absolute;left:6px;right:6px;top:10px;height:2.5px;border-radius:2px;background:var(--accent)}
.ic-speaker::before{content:"";position:absolute;left:2px;top:7px;width:6px;height:8px;background:currentColor;border-radius:2px 0 0 2px}
.ic-speaker::after{content:"";position:absolute;left:8px;top:3px;border-right:9px solid currentColor;border-top:8px solid transparent;border-bottom:8px solid transparent;border-radius:2px}

.backdrop{position:fixed;inset:0;z-index:40;background:transparent}
.backdrop.dim{background:rgba(11,42,111,.38);backdrop-filter:blur(2px)}
.backdrop[hidden],.vwin[hidden],.wcard[hidden]{display:none}

/* floating video window */
.vwin{position:fixed;z-index:60;right:24px;bottom:24px;width:min(380px,calc(100vw - 32px));background:var(--navy);border-radius:22px;overflow:hidden;box-shadow:0 18px 60px rgba(11,42,111,.45);animation:pop .16s ease-out}
.vwin.moved{right:auto;bottom:auto}
.vbar{display:flex;align-items:center;justify-content:space-between;height:48px;padding:0 6px 0 18px;color:#fff;font-weight:700;font-size:15px;cursor:grab;touch-action:none;user-select:none;-webkit-user-select:none}
.vbar:active{cursor:grabbing}
.x{width:44px;height:44px;border:0;border-radius:50%;background:rgba(255,255,255,.14);color:#fff;font-size:26px;line-height:1;cursor:pointer;display:grid;place-items:center;padding:0 0 3px}
.x:hover{background:var(--accent)}
.vwin video{display:block;width:100%;aspect-ratio:16/9;background:#000;object-fit:cover}
@media (max-width:640px){
  .vwin{right:50%;bottom:auto;top:18%;transform:translateX(50%)}
  .vwin.moved{transform:none}
}

/* word card */
.wcard{position:fixed;z-index:60;left:50%;top:50%;transform:translate(-50%,-50%);width:min(440px,calc(100vw - 32px));max-height:calc(100vh - 32px);overflow:auto;background:#fff;border-radius:28px;box-shadow:0 24px 80px rgba(11,42,111,.4);animation:cardin .18s ease-out}
@keyframes cardin{from{transform:translate(-50%,-47%) scale(.96);opacity:0}to{transform:translate(-50%,-50%);opacity:1}}
.wcard .x{position:absolute;right:12px;top:12px;background:rgba(255,255,255,.9);color:var(--navy);box-shadow:0 0 0 1px var(--line);z-index:2}
.wcard .x:hover{color:#fff}
.wimg{background:var(--soft);aspect-ratio:16/10;display:grid;place-items:center}
.wimg img{width:100%;height:100%;object-fit:cover;display:block}
.wimg.num img{object-fit:contain;padding:12px}
.wtext{padding:22px 24px 26px;text-align:center}
.wword{font-size:clamp(32px,8vw,42px);font-weight:800;letter-spacing:-.01em;line-height:1.15}
.art{color:var(--accent);font-weight:700}
.speak{margin:16px auto 6px;min-height:56px;padding:0 26px;border:0;border-radius:28px;background:var(--navy);color:#fff;font-weight:700;font-size:17px;font-family:inherit;display:inline-flex;align-items:center;gap:10px;cursor:pointer}
.speak.playing{background:var(--accent)}
.speak:active{transform:scale(.97)}
.wzh{font-size:24px;font-weight:600;margin-top:8px}
.wfor{font-size:13px;opacity:.55;margin-top:6px}

@media (min-width:900px){ .grid{grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:14px} }
@media (max-width:430px){ main,.top,.foot{padding-left:16px;padding-right:16px} .grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px} .tile{min-height:68px;border-radius:16px;font-size:26px} .tile.long{font-size:clamp(18px,5.2vw,24px)} }
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}