/* base.css — 设计令牌 + 共享组件 + PC 布局 */
:root{
  --bg:#0A0A0C; --surface:#131317; --surface-2:#1B1B21; --surface-3:#232330;
  --line:#26262E; --line-soft:#1E1E26;
  --text:#F4F4F7; --text-2:#C3C3CE; --muted:#8C8C99;
  --accent:#FF3B30; --accent-soft:rgba(255,59,48,.14);
  --info:#38BDF8;
  --s1:#7C8794; --s2:#E0A21A; --s3:#FF7A34; --s4:#FF4128; --s5:#D4194B;
  --r-sm:10px; --r:16px; --r-lg:24px;
  --serif:"Songti SC","Source Han Serif SC","Noto Serif CJK SC",Georgia,serif;
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Noto Sans CJK SC","Hiragino Sans GB",system-ui,sans-serif;
  --mono:"SF Mono",ui-monospace,"JetBrains Mono",Menlo,monospace;
  --wrap:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;overflow-x:clip}
body{
  background:var(--bg); color:var(--text); font-family:var(--sans);
  font-size:16px; line-height:1.65; -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit;color:inherit}
img,svg{max-width:100%}
::selection{background:var(--accent);color:#fff}

/* 双语切换 */
/* 三语：每个 .i18n 里并排放 zh / en / tr，只显示当前语言那一栏 */
html[data-lang="en"] .i18n>.zh, html[data-lang="en"] .i18n>.tr{display:none}
html[data-lang="zh"] .i18n>.en, html[data-lang="zh"] .i18n>.tr{display:none}
html[data-lang="tr"] .i18n>.zh, html[data-lang="tr"] .i18n>.en{display:none}
html[data-lang="en"] .zh-only, html[data-lang="en"] .tr-only{display:none!important}
html[data-lang="zh"] .en-only, html[data-lang="zh"] .tr-only{display:none!important}
html[data-lang="tr"] .zh-only, html[data-lang="tr"] .en-only{display:none!important}

/* ---------- 导航 ---------- */
.nav{
  position:sticky;top:0;z-index:60;display:flex;align-items:center;gap:24px;
  padding:14px 28px;background:rgba(10,10,12,.82);backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line-soft);
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.01em}
.brand-mark{
  display:grid;place-items:center;flex:0 0 auto;width:32px;height:32px;border-radius:9px;
  background:var(--accent);color:#fff;font-family:var(--serif);font-size:19px;font-weight:800;
  line-height:1;box-shadow:0 2px 10px rgba(255,59,48,.28);transition:transform .2s ease;
}
.brand:hover .brand-mark{transform:rotate(-6deg) scale(1.06)}
.brand-text{display:flex;flex-direction:column;line-height:1.1;font-size:15px}
.brand-text em{font-style:normal;font-size:11px;color:var(--muted);letter-spacing:.14em}
.nav-links{display:flex;gap:22px;font-size:14.5px;color:var(--text-2);margin-left:8px}
.nav-links a:hover{color:#fff}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:10px}
.nav-search input{
  width:170px;padding:8px 12px;border-radius:999px;border:1px solid var(--line);
  background:var(--surface);color:var(--text);font-size:13.5px;outline:none;transition:.2s;
}
.nav-search input:focus{border-color:var(--accent);width:210px}
.lang-toggle{
  padding:7px 12px;border-radius:999px;border:1px solid var(--line);background:transparent;
  font-size:12.5px;color:var(--text-2);cursor:pointer;letter-spacing:.04em;
}
.lang-toggle:hover{border-color:var(--accent);color:#fff}
.btn-feed{
  padding:8px 16px;border-radius:999px;background:var(--text);color:#0A0A0C;
  font-size:13.5px;font-weight:650;
}
.btn-feed:hover{background:var(--accent);color:#fff}

/* ---------- 通用组件 ---------- */
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 28px}
.muted{color:var(--muted)}
/* 仅屏幕阅读器可见：给没有可视 h1 的页面（如卡片流）提供标题 */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.chip{
  display:inline-flex;align-items:center;gap:5px;padding:4px 10px;border-radius:999px;
  background:var(--surface-2);border:1px solid var(--line);font-size:12px;color:var(--text-2);
  white-space:nowrap;
}
.chip em{font-style:normal;color:var(--muted);font-size:11px}
.chip.on{background:var(--text);color:#0A0A0C;border-color:var(--text)}
.chip-never{background:rgba(212,25,75,.14);border-color:rgba(212,25,75,.42);color:#FF7D9C}
.chip-lesson{background:rgba(56,189,248,.12);border-color:rgba(56,189,248,.4);color:#7FD7FB}
.chip-cat{background:var(--surface-2);border-color:var(--line);text-transform:uppercase;letter-spacing:.08em;font-size:10.5px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:999px;background:var(--accent);color:#fff;
  font-weight:650;font-size:15px;border:none;cursor:pointer;transition:.18s;
}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 8px 28px rgba(255,59,48,.35)}
.btn-ghost{
  display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:999px;
  border:1px solid var(--line);color:var(--text-2);font-size:14.5px;background:transparent;cursor:pointer;
}
.btn-ghost:hover{border-color:var(--text-2);color:#fff}

/* ---------- 首页 ---------- */
.hero{padding:88px 0 56px;max-width:820px}
.hero-kicker{
  font-size:11.5px;letter-spacing:.2em;color:var(--accent);font-weight:650;margin-bottom:20px;
}
.hero-h{
  font-family:var(--serif);font-size:clamp(38px,5.4vw,68px);line-height:1.08;
  letter-spacing:-.02em;font-weight:800;margin-bottom:22px;
}
.hero-sub{font-size:17.5px;color:var(--text-2);line-height:1.7;max-width:640px}
.hero-cta{display:flex;gap:12px;margin-top:34px;flex-wrap:wrap}

.sec{padding:44px 0;border-top:1px solid var(--line-soft)}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:24px}
.sec-head h2{font-size:22px;letter-spacing:-.01em;font-weight:700}
.sec-head p{font-size:14px;margin-top:4px}
.more{font-size:14px;color:var(--text-2);white-space:nowrap}
.more:hover{color:var(--accent)}
.page-head{padding:64px 0 28px}

/* 严重度标尺 */
.sevgrid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
.sevcol{background:var(--surface);border:1px solid var(--line-soft);border-radius:var(--r);padding:16px}
.sevcol-head{display:flex;align-items:center;gap:7px;font-size:12.5px;color:var(--text-2);margin-bottom:12px}
.sevcol-head b{color:#fff;font-variant-numeric:tabular-nums}
.dot{width:8px;height:8px;border-radius:50%;display:inline-block;flex:0 0 auto}
.sevcol-items{display:flex;flex-wrap:wrap;gap:6px}
.sevcol-items a{
  font-family:var(--serif);font-size:15px;padding:5px 9px;border-radius:8px;
  background:var(--surface-2);color:var(--text-2);transition:.15s;
}
.sevcol-items a:hover{background:var(--accent);color:#fff}

/* 词库网格 */
.wgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:12px}
.wgrid.big{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
.wcard{
  display:flex;flex-direction:column;gap:6px;padding:18px;border-radius:var(--r);
  background:var(--surface);border:1px solid var(--line-soft);transition:.18s;position:relative;overflow:hidden;
}
.wcard:hover{border-color:var(--line);background:var(--surface-2);transform:translateY(-2px)}
.wcard::after{
  content:"";position:absolute;inset:0 auto 0 0;width:3px;
  background:var(--s1);opacity:.9;
}
.wcard[data-sev="2"]::after{background:var(--s2)}
.wcard[data-sev="3"]::after{background:var(--s3)}
.wcard[data-sev="4"]::after{background:var(--s4)}
.wcard[data-sev="5"]::after{background:var(--s5)}
.wc-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.wc-sev{
  display:grid;place-items:center;width:22px;height:22px;border-radius:6px;
  background:color-mix(in srgb,var(--c) 22%,transparent);color:var(--c);
  font-size:11.5px;font-weight:700;font-variant-numeric:tabular-nums;
}
.wc-cat{font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.wc-hanzi{font-family:var(--serif);font-size:34px;line-height:1.15;letter-spacing:.02em;font-weight:800}
.wc-hanzi.small{font-size:22px}
.wc-py{font-size:12.5px;color:var(--muted);font-family:var(--mono);letter-spacing:.02em}
.wc-en{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.wc-eq{font-size:13.5px;color:var(--text-2);line-height:1.5;margin-top:2px}
.wcard.lesson::after{background:var(--info)}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}

/* ---------- 词条页 ---------- */
.word-page{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:48px;padding-top:28px;padding-bottom:80px}
.crumb{grid-column:1/-1;font-size:13px;color:var(--muted);margin-bottom:8px}
.crumb a:hover{color:var(--accent)}
.word-article{min-width:0}
.word-head{padding-bottom:28px;border-bottom:1px solid var(--line-soft)}
.word-hanzi{
  font-family:var(--serif);font-size:clamp(64px,9vw,104px);line-height:1.02;
  font-weight:800;letter-spacing:.02em;margin:18px 0 6px;
}
.word-pinyin{font-family:var(--mono);font-size:19px;color:var(--text-2);letter-spacing:.03em}
.tones{font-size:12px;color:var(--muted);margin-left:6px}
.variants{font-size:12.5px;color:var(--muted);margin-top:10px;display:flex;gap:8px;align-items:baseline;flex-wrap:wrap}
.variants code{background:var(--surface-2);padding:2px 7px;border-radius:6px;color:var(--text-2)}
.word-equivalent{font-size:19px;color:var(--text);margin-top:16px;line-height:1.5;max-width:620px}
.word-audio{margin-top:18px;height:34px;width:260px;max-width:100%}
.lesson-title{font-family:var(--serif);font-size:clamp(34px,5vw,52px);line-height:1.12;margin:14px 0 12px;font-weight:800}

.sevbar{display:flex;align-items:center;gap:12px;margin-top:16px;max-width:420px}
.sevbar-track{flex:1;height:6px;border-radius:99px;background:var(--surface-3);overflow:hidden}
.sevbar-fill{height:100%;border-radius:99px;background:var(--s1);transition:width .5s cubic-bezier(.2,.8,.2,1)}
.sevbar.sev2 .sevbar-fill{background:var(--s2)} .sevbar.sev3 .sevbar-fill{background:var(--s3)}
.sevbar.sev4 .sevbar-fill{background:var(--s4)} .sevbar.sev5 .sevbar-fill{background:linear-gradient(90deg,#FF4128,#D4194B)}
.sevbar-label{font-size:12.5px;color:var(--text-2);white-space:nowrap}
.sevbar-label b{color:#fff;font-variant-numeric:tabular-nums}

.block{padding:28px 0;border-bottom:1px solid var(--line-soft)}
.block-h{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-bottom:12px;font-weight:650}
.block p{font-size:16.5px;color:var(--text-2);line-height:1.75;max-width:680px}
.block-key{background:linear-gradient(90deg,rgba(56,189,248,.06),transparent);border-left:2px solid rgba(56,189,248,.5);padding-left:20px;margin-left:-20px;border-radius:0}
.block-danger{background:linear-gradient(90deg,rgba(255,65,40,.07),transparent);border-left:2px solid rgba(255,65,40,.55);padding-left:20px;margin-left:-20px}
.block-why{background:linear-gradient(90deg,rgba(224,162,26,.06),transparent);border-left:2px solid rgba(224,162,26,.45);padding-left:20px;margin-left:-20px}
.pts{list-style:none;display:flex;flex-direction:column;gap:14px;max-width:700px}
.pts li{position:relative;padding-left:20px;font-size:16.5px;color:var(--text-2);line-height:1.7}
.pts li::before{content:"";position:absolute;left:0;top:.65em;width:6px;height:6px;border-radius:50%;background:var(--info)}
.exs{display:flex;flex-direction:column;gap:14px}
.ex{
  background:var(--surface);border:1px solid var(--line-soft);border-radius:var(--r);
  padding:16px 18px;border-left:2px solid var(--accent-soft);
}
.ex blockquote{font-family:var(--serif);font-size:20px;line-height:1.45;color:#fff}
.ex figcaption{font-size:14px;color:var(--muted);margin-top:6px}
.ex-scene{font-size:11.5px;color:var(--s3);letter-spacing:.04em;display:block;margin-top:8px}
.never{margin-top:22px;padding:16px 18px;border-radius:var(--r);background:rgba(212,25,75,.07);border:1px solid rgba(212,25,75,.28)}
.never>.i18n{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:#FF7D9C}
.regional{display:flex;flex-direction:column;gap:10px}
.region-row{display:flex;gap:12px;align-items:baseline;flex-wrap:wrap;font-size:14.5px;color:var(--text-2)}
.region-row b{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);min-width:52px}
.region-row code{background:var(--surface-2);padding:2px 8px;border-radius:6px;font-family:var(--serif);font-size:16px;color:#fff}

.word-side{display:flex;flex-direction:column;gap:14px;position:sticky;top:88px;align-self:start}
.side-card{background:var(--surface);border:1px solid var(--line-soft);border-radius:var(--r);padding:18px}
.side-card h3{font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:12px;font-weight:650}
.scale{list-style:none;display:flex;flex-direction:column;gap:7px;font-size:13px;color:var(--muted)}
.scale li{display:flex;align-items:center;gap:8px;padding:4px 0}
.scale li.on{color:#fff;font-weight:600}
.scale li .i18n{margin-left:auto;font-size:12px}
.side-cta p{font-size:14px;color:var(--text-2);margin-bottom:12px}
.side-cta .btn-primary{width:100%;padding:11px}

.related{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px}
.related-card{
  display:flex;flex-direction:column;gap:4px;padding:14px;border-radius:12px;
  background:var(--surface);border:1px solid var(--line-soft);font-size:13px;color:var(--muted);
}
.related-card b{font-family:var(--serif);font-size:19px;color:#fff}
.related-card:hover{border-color:var(--accent)}

/* 搜索页 */
.big-search{display:flex;gap:10px;margin-top:18px;max-width:560px}
.big-search input{
  flex:1;padding:14px 18px;border-radius:999px;border:1px solid var(--line);
  background:var(--surface);outline:none;font-size:15px;
}
.big-search input:focus{border-color:var(--accent)}
.big-search button{
  padding:0 26px;border-radius:999px;border:none;background:var(--text);color:#0A0A0C;
  font-weight:650;cursor:pointer;
}
.empty{text-align:center;padding:70px 0;color:var(--muted)}
.empty b{display:block;font-size:20px;color:#fff;margin-bottom:8px}

/* 永远别说 */
.lede{font-size:16.5px;color:var(--text-2);max-width:720px;margin-top:12px;line-height:1.75}
.ns-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:14px;padding-bottom:80px}
.ns-card{background:var(--surface);border:1px solid var(--line-soft);border-radius:var(--r);padding:20px;border-top:2px solid rgba(212,25,75,.6)}
.ns-card header{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.ns-hanzi{font-family:var(--serif);font-size:26px}
.ns-py{font-family:var(--mono);font-size:12px;color:var(--muted)}
.ns-card header .chip{margin-left:auto}
.ns-lit{font-size:14px;color:var(--muted);margin-bottom:10px}
.ns-why{font-size:14.5px;color:var(--text-2);line-height:1.7}
.ns-instead{margin-top:12px;padding-top:12px;border-top:1px solid var(--line-soft);font-size:14px;color:var(--text-2)}
.ns-instead b{color:var(--info);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;margin-right:8px}

/* 页脚 */
.foot{border-top:1px solid var(--line-soft);padding:40px 28px 60px;text-align:center;color:var(--muted);font-size:13.5px}
.foot b{color:var(--text-2)}
.foot .muted{margin-top:10px;font-size:12px;opacity:.7}

@media (max-width:1000px){
  .word-page{grid-template-columns:1fr;gap:28px}
  .word-side{position:static;flex-direction:row;flex-wrap:wrap}
  .side-card{flex:1;min-width:220px}
  .sevgrid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  .nav-links,.nav-search{display:none}
  .wrap{padding:0 18px}
  .hero{padding:48px 0 36px}
  .wgrid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}
  .ns-grid{grid-template-columns:1fr}
  .block p,.pts li{font-size:16px}
}

/* Review pass: readable hierarchy, keyboard access and compact navigation. */
:focus-visible{outline:2px solid var(--info);outline-offset:4px}
.nav-links a[aria-current="page"]{color:var(--text);text-decoration:underline;text-decoration-color:var(--accent);text-underline-offset:8px}
.hero-sub{max-width:60ch}
.hero-h{text-wrap:balance}
.sec-head{flex-wrap:wrap;gap:12px}
.wcard{min-width:0}
.wc-eq,.wc-en{overflow-wrap:anywhere}
.big-search input{min-width:0}
button:disabled{opacity:.55;cursor:wait}
@media(max-width:760px){
  .nav{flex-wrap:wrap;gap:12px;padding:12px 18px}
  .nav-links{display:flex;order:3;flex-basis:100%;margin:0;gap:22px;overflow-x:auto;white-space:nowrap;padding:4px 0 8px}
  .nav-links a{padding:6px 0;min-height:36px}
  .nav-right{gap:8px}
  .hero-cta{flex-wrap:wrap}
  .sec-head .muted{font-size:14px}
}
@media(max-width:380px){
  .brand-text{font-size:13px}
  .btn-feed{padding:8px 10px}
  .nav{gap:8px}
  .big-search button{padding:0 16px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{scroll-behavior:auto!important;animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
}