/* 背景色调来自 CodeExamples/ai-gradient-landing: 暖米底 + 桃/薰衣草/薄荷/天空四团柔渐变 + 玻璃面板.
   字体沿用原 PTE 打字练习页, 未改动. */
:root{
  --bg:oklch(0.98 0.008 90);
  --peach:oklch(0.86 0.08 50);--lav:oklch(0.82 0.09 300);--mint:oklch(0.88 0.08 165);--sky:oklch(0.84 0.08 235);
  --glass:oklch(1 0 0 / .55);--glass-line:oklch(1 0 0 / .7);--glass-solid:oklch(1 0 0 / .85);
  --paper:var(--bg);--paper-2:var(--glass);
  --ink:oklch(0.27 0.02 285);--ink-2:oklch(0.45 0.02 285);--ink-3:oklch(0.60 0.02 285);--ink-4:oklch(0.82 0.015 285);
  --line:oklch(0.90 0.012 285);
  --ghost:oklch(0.86 0.01 285);    /* 未打的字母 */
  --accent:oklch(0.55 0.16 290);--accent-soft:oklch(0.93 0.04 290);
  --ok:oklch(0.55 0.11 160);--ok-soft:oklch(0.94 0.04 160);--ok-ink:oklch(0.46 0.11 160);
  --bad:oklch(55% 0.19 25);--bad-soft:oklch(94% 0.05 25);
  --star:oklch(72% 0.16 80);
  --warn:oklch(72% 0.14 70);
  --ease:cubic-bezier(.22,1,.36,1);
  --g1:oklch(0.86 0.08 50 / .8);--g2:oklch(0.82 0.09 300 / .75);--g3:oklch(0.88 0.08 165 / .7);--g4:oklch(0.84 0.08 235 / .6);
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:oklch(0.20 0.012 285);
    --glass:oklch(1 0 0 / .07);--glass-line:oklch(1 0 0 / .12);--glass-solid:oklch(1 0 0 / .14);
    --ink:oklch(0.93 0.01 80);--ink-2:oklch(0.72 0.012 80);--ink-3:oklch(0.55 0.012 80);--ink-4:oklch(0.36 0.012 70);
    --line:oklch(0.30 0.012 285);
    --ghost:oklch(0.36 0.012 285);
    --accent:oklch(0.76 0.13 290);--accent-soft:oklch(0.32 0.06 290);
    --ok:oklch(0.76 0.11 160);--ok-soft:oklch(0.28 0.05 160);--ok-ink:oklch(0.80 0.11 160);
    --bad:oklch(70% 0.17 25);--bad-soft:oklch(30% 0.07 25);
    --star:oklch(80% 0.15 85);
    --warn:oklch(78% 0.13 75);
    --g1:oklch(0.55 0.10 50 / .35);--g2:oklch(0.50 0.12 300 / .35);--g3:oklch(0.55 0.10 165 / .3);--g4:oklch(0.52 0.10 235 / .3);
  }
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 -apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue",Arial,sans-serif;-webkit-font-smoothing:antialiased;position:relative;overflow-x:hidden}
/* 柔渐变网格背景 */
body::before{
  content:'';position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(45% 40% at 18% 12%, var(--g1), transparent 60%),
    radial-gradient(50% 45% at 85% 8%, var(--g2), transparent 60%),
    radial-gradient(50% 50% at 75% 85%, var(--g3), transparent 60%),
    radial-gradient(45% 45% at 8% 90%, var(--g4), transparent 60%),
    var(--bg);
}
button,select,input{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}

/* top progress hairline */
.track{position:fixed;top:0;left:0;right:0;height:3px;background:var(--glass);z-index:5}
.track i{display:block;height:100%;background:var(--accent);width:0;transition:width .35s var(--ease)}

.page{min-height:100%;display:flex;flex-direction:column;padding:28px clamp(16px,5vw,56px) 20px;max-width:1080px;margin:0 auto}

/* header: decks + settings */
header{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;flex-wrap:wrap}
.decks{display:flex;gap:4px 22px;flex-wrap:wrap}
.deck{padding:6px 0 10px;color:var(--ink-3);position:relative;text-align:left;transition:color .2s}
.deck b{display:block;font-weight:600;font-size:15px;letter-spacing:.01em}
.deck small{display:block;font-size:12px;color:var(--ink-3);font-variant-numeric:tabular-nums;margin-top:1px}
.deck i{position:absolute;left:0;bottom:0;height:4px;width:100%;background:var(--glass-solid);border-radius:2px;overflow:hidden;display:flex}
.deck i b{display:block;height:100%;background:var(--ok);width:0;transition:width .4s var(--ease)}
.deck i b.prog{background:var(--accent)}
.deck i b.weak{background:var(--warn)}
.deck.active{color:var(--ink)}
.deck.active small{color:var(--ink-2)}
.deck:hover{color:var(--ink)}
.gear{color:var(--ink-3);font-size:13px;padding:8px 12px;border-radius:999px;display:flex;align-items:center;gap:6px;margin-top:2px;border:1px solid transparent}
.gear:hover,.gear[aria-expanded=true]{color:var(--ink);background:var(--glass);border-color:var(--glass-line);backdrop-filter:blur(10px)}

.settings{display:none;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px 24px;background:var(--glass);backdrop-filter:blur(16px) saturate(1.2);-webkit-backdrop-filter:blur(16px) saturate(1.2);border:1px solid var(--glass-line);border-radius:16px;padding:16px 18px;margin-top:14px;font-size:13px}
.settings.open{display:grid}
.settings label{display:flex;flex-direction:column;gap:4px;color:var(--ink-2)}
.settings label.row{flex-direction:row;align-items:center;gap:8px}
.settings select{background:var(--glass-solid);border:1px solid var(--glass-line);border-radius:8px;padding:6px 8px;color:var(--ink)}
.settings .tools{grid-column:1/-1;display:flex;gap:14px;flex-wrap:wrap;align-items:center;padding-top:8px;border-top:1px solid var(--glass-line)}
.settings .tools button{color:var(--ink-2);text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--ink-4)}
.settings .tools button:hover{color:var(--ink)}
.settings .hint{color:var(--ink-3)}
.settings code{font:12px ui-monospace,Menlo,monospace;color:var(--ink-2)}

/* quick controls */
.quick{display:flex;align-items:center;justify-content:center;gap:10px 18px;flex-wrap:wrap;margin-top:22px;font-size:13px;color:var(--ink-2)}
.seg{display:inline-flex;background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--glass-line);border-radius:999px;padding:3px}
.seg button{padding:5px 12px;border-radius:999px;color:var(--ink-3);transition:color .15s,background .15s}
.seg button:hover{color:var(--ink)}
.seg button.on{background:var(--glass-solid);color:var(--ink);box-shadow:0 1px 3px oklch(0% 0 0/.08)}
.quick label{display:inline-flex;align-items:center;gap:6px;cursor:pointer;padding:5px 12px;border-radius:999px;background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--glass-line)}
.quick label:has(input:checked){color:var(--ink)}
.quick input{accent-color:var(--accent);margin:0}

/* round progress */
.round{width:min(560px,100%);margin:20px auto 0;font-size:12px;color:var(--ink-3);font-variant-numeric:tabular-nums}
.round .lbl{display:flex;justify-content:space-between;margin-bottom:6px}
.round .lbl b{color:var(--ink-2);font-weight:500}
.round .bar{height:8px;background:var(--glass-solid);border-radius:4px;overflow:hidden;display:flex}
.round .bar b{display:block;height:100%;background:var(--accent);border-radius:4px;transition:width .35s var(--ease)}
.round .bar b.miss{background:var(--bad);border-radius:0}

/* stage */
.stage{flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:3vh 0 4vh;min-height:48vh;position:relative}
.zh{font-size:clamp(16px,2.2vw,21px);color:var(--ink-2);margin-top:6px;min-height:1.5em;letter-spacing:.02em;transition:opacity .2s}
.zh.off{display:none}
.zh.veiled{color:var(--ink-4)}
.context{font-size:13px;color:var(--ink-3);letter-spacing:.06em;text-transform:uppercase;font-variant-numeric:tabular-nums;min-height:20px}
.context span+span::before{content:"·";margin:0 8px;color:var(--ink-4)}
.word{position:relative;margin:18px 0 10px;font-family:"Iowan Old Style","Charter","Palatino",Georgia,serif;font-size:clamp(38px,7.5vw,84px);line-height:1.15;letter-spacing:-.01em;font-weight:400;cursor:text;max-width:100%;word-break:normal;overflow-wrap:anywhere;padding:0 8px;transition:opacity .25s var(--ease),transform .25s var(--ease)}
.word.long{font-size:clamp(30px,5.2vw,60px)}
.word.xlong{font-size:clamp(24px,3.8vw,44px)}
.word.out{opacity:0;transform:translateY(-10px)}
.word .c{color:var(--ghost);transition:color .06s;border-radius:.08em}
.word .c.sp{white-space:pre}
.word .c.opt{color:var(--ink-4);font-style:italic}          /* 括号里的可选词: 更浅 + 斜体, 可以不打 */
.word .c.ok{color:var(--ink)}
.word .c.opt.ok{color:var(--ink-2)}
.word .c.bad{color:var(--bad);text-decoration:underline wavy var(--bad);text-decoration-thickness:2px;text-underline-offset:.14em}
.word .c.sp.bad{background:var(--bad-soft);text-decoration:none}     /* 打错的空格: 红底块, 不用悬空红线 */
.word .c.extra{opacity:.7}     /* 超出目标的多余输入 */
.word .c.cur{color:var(--ink-2);background:var(--accent-soft)}   /* 光标: 只用淡紫底块, 不加底线 */
.word.done .c.ok{color:var(--ok-ink);transition:color .25s var(--ease)}
.word.blind{font-family:inherit;font-size:clamp(30px,5vw,56px);letter-spacing:.02em}
.word.blind .typed{color:var(--ink)}
.word.blind .caret{display:inline-block;width:2px;height:.9em;background:var(--accent);vertical-align:-.1em;margin-left:1px;animation:blink 1s steps(2) infinite}
.word.blind .ph{color:var(--ink-4)}
.feedback.hint{color:var(--ink-3);font-size:13px}
@keyframes blink{50%{opacity:0}}
.hid{position:absolute;opacity:0;width:1px;height:1px;left:50%;top:50%;pointer-events:none}
.feedback{min-height:26px;margin-top:14px;font-size:16px;color:var(--ink-2);transition:opacity .2s}
.feedback.ok{color:var(--ok)} .feedback.bad{color:var(--bad)}
.feedback b{font-weight:600;font-family:"Iowan Old Style","Charter",Georgia,serif;font-size:1.15em}
.wordbar{display:flex;gap:6px;align-items:center;justify-content:center;margin-top:18px}
.wordbar button{color:var(--ink-3);font-size:13px;padding:6px 10px;border-radius:999px;display:inline-flex;align-items:center;gap:5px}
.wordbar button:hover{color:var(--ink);background:var(--glass)}
.wordbar .star.on{color:var(--star)}
.wordbar .star .g{font-size:16px;line-height:1}
.wordbar .navhint{color:var(--ink-4);font-size:12px;margin-left:6px}
.wordbar kbd{font:11px ui-monospace,Menlo,monospace;color:var(--ink-3);border:1px solid var(--line);border-radius:4px;padding:0 4px;margin-left:2px}
.final{color:var(--ink-2);font-size:20px;font-family:"Iowan Old Style","Charter",Georgia,serif}
.final small{display:block;font:14px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;color:var(--ink-3);margin-top:8px}

/* footer status */
footer{display:flex;align-items:baseline;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--ink-3);font-size:13px;font-variant-numeric:tabular-nums;border-top:1px solid var(--glass-line);padding-top:14px}
footer .row{display:flex;gap:18px;flex-wrap:wrap}
footer b{color:var(--ink);font-weight:600}
footer .toggle{color:var(--ink-3);text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--ink-4)}
footer .toggle:hover{color:var(--ink)}
.deckbar{margin-top:12px;font-size:12px;color:var(--ink-3);font-variant-numeric:tabular-nums}
.deckbar .bar{height:10px;border-radius:5px;background:var(--glass-solid);overflow:hidden;display:flex;margin-bottom:6px}
.deckbar .bar b{display:block;height:100%;transition:width .4s var(--ease)}
.deckbar .bar .m{background:var(--ok)} .deckbar .bar .p{background:var(--accent)} .deckbar .bar .w{background:var(--warn)}
.deckbar .legend{display:flex;gap:16px;flex-wrap:wrap}
.deckbar .legend span::before{content:"";display:inline-block;width:8px;height:8px;border-radius:2px;margin-right:6px;background:var(--glass-solid);vertical-align:0}
.deckbar .legend .m::before{background:var(--ok)} .deckbar .legend .p::before{background:var(--accent)} .deckbar .legend .w::before{background:var(--warn)}
.deckbar .legend b{color:var(--ink);font-weight:600}
.review{display:none;margin-top:12px;columns:2;column-gap:32px;font-size:14px;background:var(--glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-line);border-radius:16px;padding:8px 18px}
.review.open{display:block}
.review div{display:flex;justify-content:space-between;gap:12px;padding:5px 0;border-bottom:1px solid var(--glass-line);break-inside:avoid}
.review .w{color:var(--bad);font-variant-numeric:tabular-nums;font-size:12px}
.review .k{color:var(--ink-3);font-variant-numeric:tabular-nums;font-size:12px}
.review .empty{color:var(--ink-3);border:0}
.toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%);background:var(--ink);color:var(--bg);font-size:13px;padding:8px 14px;border-radius:999px;box-shadow:0 10px 30px -10px oklch(0% 0 0/.4);z-index:9}
@media (max-width:600px){.review{columns:1}.wordbar kbd{display:none}.decks{gap:4px 14px;flex-wrap:nowrap;overflow-x:auto;max-width:100%;scrollbar-width:none;-webkit-overflow-scrolling:touch}.decks::-webkit-scrollbar{display:none}.deck{flex:0 0 auto}header{flex-wrap:nowrap}}

/* ===== 课程侧边栏 ===== */
.menu{position:fixed;top:14px;left:14px;z-index:7;width:38px;height:38px;border-radius:12px;background:var(--glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-line);color:var(--ink-2);font-size:18px;display:flex;align-items:center;justify-content:center;transition:opacity .2s}
.menu:hover{color:var(--ink);background:var(--glass-solid)}
body.side-open .menu{opacity:0;pointer-events:none}
.side{position:fixed;top:0;left:0;bottom:0;width:272px;z-index:8;background:var(--glass);backdrop-filter:blur(20px) saturate(1.2);-webkit-backdrop-filter:blur(20px) saturate(1.2);border-right:1px solid var(--glass-line);display:flex;flex-direction:column;transform:translateX(-100%);transition:transform .28s var(--ease)}
body.side-open .side{transform:none}
.side-head{display:flex;align-items:center;justify-content:space-between;padding:18px 18px 10px;font-size:15px;color:var(--ink)}
.side-head button{color:var(--ink-3);font-size:14px;padding:4px 8px;border-radius:8px}
.side-head button:hover{color:var(--ink);background:var(--glass-solid)}
.courses{flex:1;overflow-y:auto;padding:4px 10px 10px;display:flex;flex-direction:column;gap:2px}
.course{display:block;width:100%;text-align:left;padding:10px 12px;border-radius:12px;color:var(--ink-2);transition:background .15s,color .15s}
.course:hover{background:var(--glass-solid);color:var(--ink)}
.course.active{background:var(--glass-solid);color:var(--ink);box-shadow:0 1px 3px oklch(0% 0 0/.06)}
.course b{display:block;font-weight:600;font-size:14px}
.course small{display:block;font-size:11.5px;color:var(--ink-3);margin-top:2px;line-height:1.4}
.course .cp{display:flex;align-items:center;gap:8px;margin-top:7px;font-size:11px;color:var(--ink-3);font-variant-numeric:tabular-nums}
.course .cp i{flex:1;height:4px;border-radius:2px;background:var(--line);overflow:hidden;display:flex}
.course .cp i b{display:block;height:100%;background:var(--ok)} .course .cp i b.prog{background:var(--accent)}
.side-foot{padding:12px 18px 16px;border-top:1px solid var(--glass-line);font-size:12px;color:var(--ink-3)}
.side-foot b{color:var(--ink);font-weight:600}
.backdrop{position:fixed;inset:0;z-index:7;background:oklch(0% 0 0/.25);opacity:0;pointer-events:none;transition:opacity .25s}
@media (min-width:900px){ body.side-open{padding-left:272px} body.side-open .page{margin:0 auto} }
@media (max-width:899px){ body.side-open .backdrop{opacity:1;pointer-events:auto} }

/* ===== 音标 / 例句 ===== */
.zh .ph{font-family:"Charter","Iowan Old Style",Georgia,serif;color:var(--ink-3);margin-right:6px;letter-spacing:0}
.ex{max-width:720px;margin:10px auto 0;font-size:15px;color:var(--ink-2);line-height:1.5}
.ex.off{display:none}
.ex i{font-family:"Iowan Old Style","Charter",Georgia,serif;font-style:italic}
.ex small{display:block;font-size:13px;color:var(--ink-3);margin-top:2px}
.word.xxlong{font-size:clamp(20px,3vw,34px)}

/* ===== 跟读 ===== */
.word.say{cursor:pointer}
.word.say .sw{color:var(--ink);transition:color .15s}
.word.say .sw.opt{color:var(--ink-4);font-style:italic}
.word.say .sw.ok{color:var(--ok)}
.word.say .sw.bad{color:var(--bad);text-decoration:underline wavy var(--bad);text-decoration-thickness:2px;text-underline-offset:.14em}
.heard{margin-top:10px;font-size:16px;color:var(--ink-2);min-height:1.5em}
.heard.off{display:none}
.heard .lbl{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);margin-right:8px;vertical-align:.1em}
.wordbar .mic{color:var(--ink);background:var(--glass-solid);border:1px solid var(--glass-line);padding:6px 12px}
.wordbar .mic .dot{width:9px;height:9px;border-radius:50%;background:var(--bad);display:inline-block}
.wordbar .mic.on{background:var(--bad-soft);border-color:transparent}
.wordbar .mic.on .dot{animation:pulse 1s ease-in-out infinite}
@keyframes pulse{0%,100%{transform:scale(1);opacity:1}50%{transform:scale(1.5);opacity:.5}}

[hidden]{display:none!important}

/* ===== 顶栏右侧按钮组 ===== */
.hdr-actions{display:flex;gap:4px;align-items:center}

/* ===== 专注模式: 只留题目 + 中文 + 反馈, 顶部细进度线保留 ===== */
.unfocus{position:fixed;top:14px;right:16px;z-index:7;display:none;align-items:center;gap:6px;padding:7px 12px;border-radius:999px;font-size:12px;color:var(--ink-3);background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--glass-line);opacity:.35;transition:opacity .2s}
.unfocus:hover{opacity:1;color:var(--ink)}
.unfocus kbd{font:11px ui-monospace,Menlo,monospace;border:1px solid var(--line);border-radius:4px;padding:0 4px}
body.focus .unfocus{display:inline-flex}
body.focus .menu,body.focus header,body.focus .settings,body.focus .quick,body.focus .round,body.focus .context,body.focus footer,body.focus .deckbar,body.focus .review{display:none!important}
body.focus .wordbar button:not(.mic),body.focus .wordbar .navhint{display:none}
body.focus .page{margin:0 auto;max-width:1080px;padding-top:0}
body.focus .stage{min-height:calc(100vh - 40px);padding:0}
body.focus .word{margin-top:0}

/* ===== 账号区 / 同步状态 / 带按钮的提示 ===== */
.account{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:8px;flex-wrap:wrap}
.account .who{color:var(--ink);font-weight:600;font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:170px}
.account button,.account .login{color:var(--ink-2);font-size:12px;padding:4px 10px;border-radius:999px;background:var(--glass-solid);border:1px solid var(--glass-line);text-decoration:none}
.account .login{color:var(--ink);font-weight:600}
.account small{display:block;width:100%;color:var(--ink-3);font-size:11px}
.sync{color:var(--warn)}
.toast .tbtn{margin-left:10px;background:var(--bg);color:var(--ink);padding:3px 10px;border-radius:999px;font-size:12px;font-weight:600}

/* ===== 词库很多时的紧凑标签 ===== */
.decks.many{gap:6px 8px}
.decks.many .deck{padding:5px 10px 7px;border-radius:999px;background:var(--glass);border:1px solid var(--glass-line);color:var(--ink-2)}
.decks.many .deck b{font-size:13px;font-weight:500}
.decks.many .deck small{display:none}
.decks.many .deck i{left:10px;right:10px;width:auto;bottom:3px;height:2px;border-radius:1px;background:transparent}
.decks.many .deck.active{background:var(--glass-solid);color:var(--ink);box-shadow:0 1px 3px oklch(0% 0 0/.06)}
.decks.many .deck.active b{font-weight:600}

/* ===== 听读模式 ===== */
.word.read{cursor:default}
.word.read .chunk{color:var(--ink)}
.word.read .gap{display:inline-block;width:.6em}
.chunks{max-width:820px;margin:8px auto 0;font-family:"Iowan Old Style","Charter",Georgia,serif;font-size:clamp(15px,1.6vw,19px);color:var(--ink-2);line-height:1.6}
.chunks.off{display:none}
.chunks i{color:var(--accent);font-style:normal;margin:0 .35em;opacity:.7}
/* ===== 我的词库管理 ===== */
.mydecks{margin-top:12px;background:var(--glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-line);border-radius:16px;padding:8px 18px;font-size:14px}
.mydecks div{display:flex;justify-content:space-between;gap:12px;padding:8px 0;border-bottom:1px solid var(--glass-line)}
.mydecks div:last-child{border-bottom:0}
.mydecks small{color:var(--ink-3);margin-left:6px}
.mydecks button{color:var(--ink-2);text-decoration:underline;text-underline-offset:3px;font-size:13px}
.mydecks .empty{color:var(--ink-3);border:0}