/* site.css — typingpractice design system. Deep-space neon.
 * Design tokens follow the approved MVP direction (2026-10-25). */
:root{
  --bg:#0A0910;
  --panel:rgba(255,255,255,.035);
  --panel-solid:#131118;
  --ink:#F2EFE9;
  --ink-soft:#B9B3C4;
  --muted:#7D768A;
  --line:rgba(255,255,255,.09);
  --line-strong:rgba(255,255,255,.16);
  --accent:#FF6A3D;
  --accent2:#FFB25E;
  --glow:rgba(255,106,61,.16);
  --font-serif:Georgia,'Iowan Old Style','Times New Roman',serif;
  --font-sans:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',sans-serif;
  --font-mono:ui-monospace,'Cascadia Code','SF Mono',Consolas,'Liberation Mono',monospace;
}
html[data-theme="cobalt"]{ --accent:#5B8CFF; --accent2:#8FE3FF; --glow:rgba(91,140,255,.16); }
html[data-theme="forest"]{ --accent:#3ED598; --accent2:#B8F06B; --glow:rgba(62,213,152,.15); }
html[data-mode="light"]{
  --bg:#F7F5F0;
  --panel:rgba(255,255,255,.75);
  --panel-solid:#FFFFFF;
  --ink:#1C1917;
  --ink-soft:#575048;
  --muted:#8C8375;
  --line:rgba(28,25,23,.10);
  --line-strong:rgba(28,25,23,.18);
}
html[data-mode="light"] .typing-text .ch-pending{color:#B4AC9E}
*{margin:0;padding:0;box-sizing:border-box}
html,body{min-height:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
.bg-aurora{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.bg-aurora::before{content:"";position:absolute;width:70vw;height:70vw;left:50%;top:-38vw;transform:translateX(-50%);background:radial-gradient(closest-side,var(--glow),transparent 70%);border-radius:50%}
.bg-grid{position:fixed;inset:0;z-index:0;pointer-events:none;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:64px 64px;-webkit-mask-image:radial-gradient(ellipse 90% 60% at 50% 0%,black 20%,transparent 75%);mask-image:radial-gradient(ellipse 90% 60% at 50% 0%,black 20%,transparent 75%)}
.wrap{position:relative;z-index:1;width:100%;max-width:1160px;margin:0 auto;padding:0 32px}

/* header */
header{display:flex;align-items:center;justify-content:space-between;padding:26px 0}
.wordmark{font-family:var(--font-serif);font-size:22px;letter-spacing:-.02em;font-weight:700;color:var(--ink);text-decoration:none}
.wordmark .dot{color:var(--accent)}
.nav{display:flex;gap:6px;align-items:center}
.nav a,.pill{
  border:1px solid var(--line);background:var(--panel);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  color:var(--ink-soft);border-radius:999px;padding:9px 16px;font-size:13px;cursor:pointer;text-decoration:none;
  display:flex;align-items:center;gap:8px;transition:all .18s;
}
.nav a:hover,.pill:hover{border-color:var(--line-strong);color:var(--ink);box-shadow:0 0 24px var(--glow)}
.nav a.active{color:var(--ink);border-color:var(--line-strong)}
.pill.sq{width:42px;justify-content:center;padding:9px 0}

/* hero */
.hero{padding:74px 0 40px}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:26px}
.eyebrow .line{height:1px;width:56px;background:linear-gradient(90deg,var(--accent),transparent)}
.hero h1{font-family:var(--font-serif);font-weight:500;font-size:clamp(46px,7.4vw,96px);line-height:1.02;letter-spacing:-.03em;max-width:14ch}
.hero h1 .grad{font-style:italic;background:linear-gradient(100deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{margin-top:26px;font-size:17px;line-height:1.65;color:var(--ink-soft);max-width:56ch}

/* arena */
.arena{margin-top:28px;border-radius:28px;border:1px solid var(--line);background:var(--panel);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);box-shadow:0 40px 120px -40px rgba(0,0,0,.6),inset 0 1px 0 rgba(255,255,255,.06);overflow:hidden}
.toolbar{display:flex;align-items:center;gap:10px;padding:20px 26px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.chip{border:1px solid var(--line);background:transparent;color:var(--muted);border-radius:999px;padding:8px 18px;font-size:13.5px;font-family:var(--font-mono);cursor:pointer;transition:all .16s}
.chip:hover{border-color:var(--line-strong);color:var(--ink-soft)}
.chip.active{background:linear-gradient(120deg,var(--accent),var(--accent2));color:#120F0D;border-color:transparent;font-weight:700;box-shadow:0 4px 24px var(--glow),0 0 40px var(--glow)}
.toolbar .spacer{flex:1}
.mode-label{font-size:11.5px;color:var(--muted);letter-spacing:.14em;text-transform:uppercase}
.icon-btn{border:1px solid var(--line);background:transparent;color:var(--ink-soft);border-radius:999px;width:38px;height:38px;cursor:pointer;font-size:16px;display:flex;align-items:center;justify-content:center;transition:all .16s;text-decoration:none}
.icon-btn:hover{border-color:var(--accent);color:var(--accent);box-shadow:0 0 20px var(--glow)}
.icon-btn.sound-off{opacity:.4;text-decoration:line-through}

/* typing */
.typing-area{padding:52px 52px 40px;min-height:280px}
.typing-text{font-family:var(--font-mono);font-size:clamp(23px,3.2vw,32px);line-height:1.8;letter-spacing:.012em;word-break:break-word;user-select:none}
.typing-text .ch-pending{color:#5A5464}
.typing-text .ch-current{color:var(--ink);border-radius:6px;position:relative;animation:curGlow 1.1s ease-in-out infinite}
.typing-text .ch-current::after{content:"";position:absolute;left:8%;right:8%;bottom:2px;height:3px;border-radius:2px;background:linear-gradient(90deg,var(--accent),var(--accent2));box-shadow:0 0 14px var(--accent)}
@keyframes curGlow{0%,100%{background:var(--glow)}50%{background:transparent}}
.typing-text .ch-done{color:var(--ink)}
.typing-text .ch-wrong{color:#FF5A4E;background:rgba(255,90,78,.12);border-radius:6px}
/* zh pinyin annotation: subtitle-style under the hanzi, letter-level states */
.typing-text span.zh{display:inline-block;text-align:center;vertical-align:top}
.typing-text .py{display:block;font-style:normal;font-size:.55em;line-height:1.45;letter-spacing:.04em;color:var(--muted);opacity:.95;margin-top:2px;font-weight:400}
.typing-text .py i{font-style:normal;transition:color .1s}
.typing-text .py i.d{color:var(--ink-soft)}
.typing-text .py i.c{color:var(--accent);font-weight:700;text-shadow:0 0 12px var(--glow)}
.typing-text .ch-wrong .py{color:#FF5A4E}
.typing-text .ch-done .py{opacity:.45}
.typing-text .ch-done .py i.d{color:var(--muted)}
.typing-hint{margin-top:28px;font-size:12.5px;color:var(--muted);display:flex;gap:20px;flex-wrap:wrap;align-items:center}
.typing-hint kbd{font-family:var(--font-mono);border:1px solid var(--line);border-bottom-width:2px;border-radius:7px;padding:3px 9px;font-size:12px;background:var(--panel-solid);color:var(--ink-soft)}
.progress{height:3px;background:var(--line);position:relative;overflow:hidden}
.progress i{position:absolute;left:0;top:0;bottom:0;width:0%;background:linear-gradient(90deg,var(--accent),var(--accent2));box-shadow:0 0 12px var(--accent);transition:width .12s}

.stats-row{display:flex;border-top:1px solid var(--line)}
.stat{flex:1;padding:26px 30px}
.stat + .stat{border-left:1px solid var(--line)}
.stat .label{font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin-bottom:10px}
.stat .value{font-family:var(--font-mono);font-size:46px;font-weight:700;letter-spacing:-.03em;line-height:1;font-variant-numeric:tabular-nums}
.stat .value.accented{background:linear-gradient(110deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .sub{font-size:11.5px;color:var(--muted);margin-top:8px;font-family:var(--font-mono)}

.result-banner{display:none;padding:30px 52px;border-top:1px solid var(--line);background:linear-gradient(90deg,var(--glow),transparent 60%)}
.result-banner.show{display:flex;align-items:baseline;gap:30px;flex-wrap:wrap}
.result-banner .big{font-family:var(--font-mono);font-size:72px;font-weight:700;letter-spacing:-.04em;line-height:1;background:linear-gradient(110deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 26px var(--glow))}
.result-banner .meta{font-size:14px;color:var(--ink-soft);line-height:1.9}
.result-banner .meta b{color:var(--ink);font-family:var(--font-mono);font-size:15px}

/* keyboard — real keycaps: variable unit widths, 3D body, press travel */
.kb-wrap{padding:0 26px 30px}
.kb{border:1px solid var(--line);border-radius:20px;padding:22px 18px;background:rgba(0,0,0,.28);
  display:flex;flex-direction:column;gap:7px;overflow-x:auto}
html[data-mode="light"] .kb{background:rgba(28,25,23,.05)}
.kb-row{display:flex;gap:6px;min-width:max-content;margin:0 auto}
:root{--u:44px}
@media(max-width:820px){:root{--u:30px}}
.key{
  width:var(--u);height:calc(var(--u)*1.04);flex:0 0 auto;border-radius:8px;
  border:1px solid var(--line-strong);
  background:linear-gradient(180deg,#23202C 0%,#1A1722 55%,#16131D 100%);
  position:relative;display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);color:var(--ink-soft);user-select:none;
  box-shadow:0 calc(var(--u)*0.085) 0 rgba(0,0,0,.55),inset 0 1px 0 rgba(255,255,255,.07);
  transition:transform .06s,box-shadow .06s,background .12s;
}
html[data-mode="light"] .key{background:linear-gradient(180deg,#FDFCF9 0%,#F1EEE7 55%,#E7E3D9 100%);box-shadow:0 calc(var(--u)*0.085) 0 rgba(0,0,0,.18),inset 0 1px 0 rgba(255,255,255,.9)}
.key .k-main{font-size:calc(var(--u)*0.30);line-height:1;font-weight:600;position:relative;z-index:1}
.key .k-top{position:absolute;top:13%;left:14%;font-size:calc(var(--u)*0.20);line-height:1;color:var(--muted);opacity:.85}
.key.w2{width:calc(var(--u)*2)}
.key.w1-5{width:calc(var(--u)*1.5)}
.key.w1-25{width:calc(var(--u)*1.25)}
.key.w1-75{width:calc(var(--u)*1.75)}
.key.w2-25{width:calc(var(--u)*2.25)}
.key.w2-75{width:calc(var(--u)*2.75)}
.key.w3-5{width:calc(var(--u)*3.5)}
.key.w6-25{width:calc(var(--u)*6.25)}
.key.f1,.key.f2,.key.f3,.key.f4{background:linear-gradient(180deg,rgba(62,213,152,.16),rgba(62,213,152,.07) 60%,rgba(62,213,152,.10));border-color:rgba(62,213,152,.28)}
html[data-mode="light"] .key.f1,html[data-mode="light"] .key.f2,html[data-mode="light"] .key.f3,html[data-mode="light"] .key.f4{background:linear-gradient(180deg,rgba(62,213,152,.14),rgba(62,213,152,.05))}
.key.f5,.key.f6,.key.f7,.key.f8{background:linear-gradient(180deg,rgba(91,140,255,.16),rgba(91,140,255,.07) 60%,rgba(91,140,255,.10));border-color:rgba(91,140,255,.28)}
html[data-mode="light"] .key.f5,html[data-mode="light"] .key.f6,html[data-mode="light"] .key.f7,html[data-mode="light"] .key.f8{background:linear-gradient(180deg,rgba(91,140,255,.14),rgba(91,140,255,.05))}
.key.f9{background:linear-gradient(180deg,rgba(255,106,61,.16),rgba(255,106,61,.07) 60%,rgba(255,106,61,.10));border-color:rgba(255,106,61,.28)}
html[data-mode="light"] .key.f9{background:linear-gradient(180deg,rgba(255,106,61,.14),rgba(255,106,61,.05))}
.key.mod .k-main{font-size:calc(var(--u)*0.22);color:var(--muted);font-weight:500}
.key.hit{
  background:linear-gradient(130deg,var(--accent),var(--accent2));color:#120F0D;font-weight:800;
  border-color:transparent;transform:translateY(calc(var(--u)*0.06));
  box-shadow:0 calc(var(--u)*0.025) 0 rgba(0,0,0,.5),0 0 26px var(--glow),0 0 60px var(--glow);
}
.key.hit .k-top{color:#120F0D;opacity:.7}
/* physically pressed key: full travel + bright flash — unmistakable */
.key.pressed{
  background:linear-gradient(130deg,var(--accent2),#FFFFFF 55%,var(--accent));
  color:#120F0D;font-weight:800;border-color:#FFFFFF;
  transform:translateY(calc(var(--u)*0.085)) scale(.96);
  box-shadow:0 0 0 rgba(0,0,0,.5),0 0 22px var(--accent2),0 0 55px var(--accent),inset 0 -2px 6px rgba(0,0,0,.18);
  filter:brightness(1.25);
}
.key.pressed .k-top{color:#120F0D;opacity:.85}
.kb-legend{display:flex;gap:18px;justify-content:center;margin-top:14px;font-size:11px;color:var(--muted);flex-wrap:wrap}
.kb-legend span{display:flex;align-items:center;gap:7px}
.kb-legend i{width:10px;height:10px;border-radius:3px;display:inline-block}
.l1{background:rgba(62,213,152,.5)}.l2{background:rgba(91,140,255,.5)}.l3{background:rgba(255,106,61,.5)}

/* header controls */
.h-actions{display:flex;gap:12px;align-items:center}
.lang-sel{
  appearance:none;-webkit-appearance:none;border:1px solid var(--line);background:var(--panel);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:var(--ink-soft);
  border-radius:999px;padding:9px 30px 9px 16px;font-size:13px;cursor:pointer;font-family:var(--font-sans);
  background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23B9B3C4' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 12px center;transition:all .18s;
}
.lang-sel:hover{border-color:var(--line-strong);color:var(--ink);box-shadow:0 0 24px var(--glow)}
.lang-sel:focus{outline:none;border-color:var(--accent)}
.lang-sel option{background:var(--panel-solid);color:var(--ink)}

/* footer theme dots */
.theme-dots{display:flex;gap:10px;align-items:center}
.theme-dots button{width:20px;height:20px;border-radius:50%;border:2px solid var(--line-strong);cursor:pointer;padding:0;transition:all .15s}
.theme-dots button.on{border-color:var(--ink);box-shadow:0 0 16px var(--glow)}
.d-ember{background:#FF6A3D}.d-cobalt{background:#5B8CFF}.d-forest{background:#3ED598}

/* game arena */
.game-canvas{position:relative;height:420px;overflow:hidden;border-radius:16px;border:1px solid var(--line);background:rgba(0,0,0,.25)}
.word-drop{position:absolute;font-family:var(--font-mono);font-size:20px;color:var(--ink-soft);white-space:nowrap;transition:top .2s linear;padding:2px 10px;border-radius:8px}
.word-drop.done{color:var(--ink)}
.word-drop.dead{color:#FF5A4E}
.word-drop.active{color:var(--accent);box-shadow:0 0 18px var(--glow)}
.game-input-row{display:flex;gap:12px;padding:18px 0 0}
.game-input{flex:1;background:var(--panel-solid);border:1px solid var(--line-strong);border-radius:12px;color:var(--ink);font-family:var(--font-mono);font-size:20px;padding:14px 18px;outline:none}
.game-input:focus{border-color:var(--accent);box-shadow:0 0 24px var(--glow)}

/* GEO: visible FAQ (Chinese AI engines read HTML, not JSON-LD) */
.faq{max-width:860px;padding:40px 0 10px}
.faq h2{font-family:var(--font-serif);font-size:24px;letter-spacing:-.01em;margin-bottom:16px}
.faq details{border:1px solid var(--line);border-radius:14px;background:var(--panel);margin-bottom:10px;overflow:hidden;transition:border-color .15s}
.faq details:hover{border-color:var(--line-strong)}
.faq details[open]{border-color:var(--line-strong)}
.faq summary{cursor:pointer;padding:15px 20px;font-size:15px;font-weight:600;color:var(--ink);list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--font-mono);color:var(--accent);font-size:18px}
.faq details[open] summary::after{content:"−"}
.faq details p{padding:0 20px 16px;font-size:14px;line-height:1.75;color:var(--ink-soft)}

/* content pages */
.content{max-width:760px;padding:20px 0 60px}
.content h1{font-family:var(--font-serif);font-size:38px;letter-spacing:-.02em;margin:20px 0 8px}
.content h1 .grad{font-style:italic;background:linear-gradient(100deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.content h2{font-family:var(--font-serif);font-size:22px;margin:34px 0 12px}
.content p{color:var(--ink-soft);font-size:15px;line-height:1.8;margin-bottom:16px}
.content a{color:var(--accent)}

/* features */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;padding:48px 0 16px}
.feat{border:1px solid var(--line);border-radius:22px;padding:30px 28px;background:var(--panel);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);transition:transform .18s,border-color .18s,box-shadow .18s;position:relative;overflow:hidden;text-decoration:none;display:block}
.feat:hover{transform:translateY(-4px);border-color:var(--line-strong);box-shadow:0 24px 60px -24px var(--glow)}
.feat .fnum{position:absolute;right:20px;top:14px;font-family:var(--font-serif);font-style:italic;font-size:64px;line-height:1;color:transparent;background:linear-gradient(160deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;opacity:.28}
.feat .fico{width:42px;height:42px;border-radius:13px;background:var(--glow);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-size:19px;margin-bottom:18px;color:var(--accent)}
.feat h3{font-family:var(--font-serif);font-size:20px;letter-spacing:-.01em;margin-bottom:10px;color:var(--ink)}
.feat p{font-size:13.5px;color:var(--ink-soft);line-height:1.65}

footer{display:flex;justify-content:space-between;align-items:center;padding:30px 0 44px;color:var(--muted);font-size:12.5px;border-top:1px solid var(--line);margin-top:28px;flex-wrap:wrap;gap:12px}
footer nav{display:flex;gap:16px}
footer nav a{color:var(--muted);text-decoration:none}
footer nav a:hover{color:var(--ink-soft)}

@media(max-width:720px){
  .features{grid-template-columns:1fr}
  .typing-area{padding:34px 24px 28px}
  .stat .value{font-size:34px}
  .stat{padding:20px 18px}
  .result-banner .big{font-size:56px}
  header{flex-wrap:wrap;gap:10px}
  .h-actions{margin-left:auto}
}