/* /en/simplified-traditional-converter/ — NewBeBox, standalone English page.
   Light theme = demo-saas.html; dark theme per spec. No external resources. */

:root{
  --bg:#F7F8FC; --card:#FFFFFF; --ink:#101828; --muted:#667085; --line:#E4E7EC;
  --seal:#4361EE; --seal-dk:#3249C9; --tint:#E6EBFF; --mark-ink:#2B3FB5;
  --warn:#93400D; --warn-bg:#FEF0C7; --warn-line:#F79009;
  --dai:#0E9F8E; --dai-tint:#D5F5EE; --dai-ink:#066356;
  --paper:#FFFFFF; --out:#FBFCFE; --seg:#F2F4F7; --rule:#F2F4F7;
  --chip:#FFFFFF;
  --shadow:0 1px 2px rgba(16,24,40,.06),0 16px 36px -14px rgba(16,24,40,.14);
  --shadow-sm:0 1px 2px rgba(16,24,40,.2);
  --sans:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;
  --han:'PingFang TC','PingFang SC','Hiragino Sans GB','Microsoft JhengHei','Noto Sans CJK SC',sans-serif;
  --serif:'Songti SC','Source Han Serif SC',Georgia,serif;
  color-scheme:light;
}
/* Dark palette — 背景 #0F1419 / 卡片 #1A2230 / 文字 #E8EDF3 / 线条 #2A3441，
   蓝色系整体调暗 20%，琥珀色保持。以下两块内容必须保持一致：
   ① 手动切换（data-theme="dark"）② 跟随系统（且未手动指定 light）。 */
html[data-theme="dark"]{
  --bg:#0F1419; --card:#1A2230; --ink:#E8EDF3; --muted:#8C9AAB; --line:#2A3441;
  --seal:#364EBE; --seal-dk:#2C41A3; --tint:#1D2740; --mark-ink:#A9BAFF;
  --warn:#F5C26B; --warn-bg:#33280F; --warn-line:#F79009;
  --dai:#12A594; --dai-tint:#123B36; --dai-ink:#7BE3D2;
  --paper:#161D28; --out:#141B24; --seg:#111821; --rule:#141B24;
  --chip:#1A2230;
  --shadow:0 1px 2px rgba(0,0,0,.45),0 16px 36px -14px rgba(0,0,0,.65);
  --shadow-sm:0 1px 2px rgba(0,0,0,.45);
  color-scheme:dark;
}
@media (prefers-color-scheme: dark){
  html:not([data-theme="light"]){
    --bg:#0F1419; --card:#1A2230; --ink:#E8EDF3; --muted:#8C9AAB; --line:#2A3441;
    --seal:#364EBE; --seal-dk:#2C41A3; --tint:#1D2740; --mark-ink:#A9BAFF;
    --warn:#F5C26B; --warn-bg:#33280F; --warn-line:#F79009;
    --dai:#12A594; --dai-tint:#123B36; --dai-ink:#7BE3D2;
    --paper:#161D28; --out:#141B24; --seg:#111821; --rule:#141B24;
    --chip:#1A2230;
    --shadow:0 1px 2px rgba(0,0,0,.45),0 16px 36px -14px rgba(0,0,0,.65);
    --shadow-sm:0 1px 2px rgba(0,0,0,.45);
    color-scheme:dark;
  }
}

*{box-sizing:border-box}
html{scroll-padding-top:16px}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
:focus-visible{outline:2px solid var(--seal);outline-offset:2px}
.wrap{max-width:1040px;margin:0 auto;padding:0 18px}

/* header */
header{padding:18px 0 4px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;letter-spacing:-.01em;white-space:nowrap}
.seal{width:32px;height:32px;border-radius:8px;flex:none;display:block}
.hright{display:flex;align-items:center;gap:10px;min-width:0}
.privacy{font-size:13px;color:var(--muted);display:flex;align-items:center;gap:7px;background:var(--chip);border:1px solid var(--line);border-radius:999px;padding:5px 12px;white-space:nowrap}
.privacy i{width:7px;height:7px;border-radius:50%;background:var(--dai);flex:none}
.privacy .short{display:none}
.tbtn{width:40px;height:40px;flex:none;display:grid;place-items:center;border-radius:50%;border:1px solid var(--line);background:var(--chip);color:var(--ink);cursor:pointer;padding:0}
.tbtn:hover{border-color:var(--seal);color:var(--seal)}
.tbtn svg{width:18px;height:18px}
.tbtn .ic-sun{display:none}
html[data-theme="dark"] .tbtn .ic-sun{display:block}
html[data-theme="dark"] .tbtn .ic-moon{display:none}
@media (prefers-color-scheme: dark){
  html:not([data-theme="light"]) .tbtn .ic-sun{display:block}
  html:not([data-theme="light"]) .tbtn .ic-moon{display:none}
}

.hero{padding:44px 0 28px;text-align:center}
h1{font:700 clamp(28px,6.4vw,48px)/1.12 var(--sans);letter-spacing:-.035em;margin:0 auto 14px;max-width:15em}
.hero p{margin:0 auto;color:var(--muted);max-width:36em;font-size:17px}

/* tool */
.tool{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px;box-shadow:var(--shadow)}
.bar{display:flex;flex-wrap:wrap;gap:10px 16px;align-items:center;justify-content:space-between;padding:2px 2px 14px}
.bar b{font-size:14px;font-weight:600}
.seg{display:inline-flex;background:var(--seg);border-radius:12px;padding:3px;gap:2px}
.seg button{font:500 14px var(--sans);border:0;background:none;color:var(--muted);padding:8px 14px;border-radius:9px;cursor:pointer;min-height:40px}
.seg button[aria-pressed=true]{background:var(--card);color:var(--ink);box-shadow:0 1px 3px rgba(60,40,20,.18)}
.seg button[aria-pressed=true]::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--seal);margin-right:7px;vertical-align:middle}

.panes{display:grid;grid-template-columns:minmax(0,1fr);gap:10px;align-items:stretch}
.pane{border:1px solid var(--line);border-radius:12px;background:var(--paper);display:flex;flex-direction:column;min-height:300px;min-width:0}
.pane.out{background:var(--out)}
.ph{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 14px;border-bottom:1px solid var(--line);font-size:14px;font-weight:600}
.ph span:last-child{color:var(--muted);font-weight:400;font-size:13px}
textarea,.res{flex:1;margin:0;border:0;background:none;resize:none;padding:14px;font:400 22px/1.7 var(--han);color:var(--ink);width:100%;min-height:210px}
textarea:focus{outline:none}
.res{line-height:2.05;overflow:auto;overflow-wrap:anywhere}
.res p{margin:0 0 2px}
.res .loading{color:var(--muted);font:400 15px/1.6 var(--sans)}
.pf{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 14px;border-top:1px solid var(--line);font-size:13px;color:var(--muted);min-height:50px}
.link{font:500 13px var(--sans);color:var(--muted);background:none;border:0;cursor:pointer;padding:8px 4px}
.link:hover{color:var(--ink)}
.copy{font:600 14px var(--sans);background:var(--seal);color:#fff;border:0;border-radius:10px;padding:9px 16px;cursor:pointer;box-shadow:var(--shadow-sm);display:inline-flex;gap:8px;align-items:center}
.copy:hover{filter:brightness(1.08)}.copy:active{transform:translateY(1px)}
.copy.done{background:var(--dai)}

/* swap */
.swap{justify-self:center;align-self:center;width:48px;height:48px;border-radius:50%;border:1px solid var(--line);background:var(--chip);color:var(--seal);cursor:pointer;display:grid;place-items:center;box-shadow:var(--shadow-sm);transition:transform .25s,filter .2s}
.swap:hover{border-color:var(--seal);background:var(--tint)}
.swap svg{width:22px;height:22px;transform:rotate(90deg);transition:transform .25s}
.swap[aria-pressed=true] svg{transform:rotate(270deg)}
@media(min-width:820px){
  .panes{grid-template-columns:minmax(0,1fr) 64px minmax(0,1fr)}
  .swap svg{transform:none}
  .swap[aria-pressed=true] svg{transform:rotate(180deg)}
}

/* highlights */
mark.c{background:var(--tint);color:var(--mark-ink);border-radius:4px;padding:0 1px;box-shadow:inset 0 -2px 0 rgba(67,97,238,.45)}
mark.v{background:var(--dai-tint);color:var(--dai-ink);border-radius:4px;padding:0 1px;box-shadow:inset 0 -2px 0 var(--dai)}
.amb{background:var(--warn-bg);color:var(--ink);border-radius:4px;box-shadow:inset 0 -2px 0 var(--warn-line);padding:0 1px}
.amb mark.c{background:none;box-shadow:none;color:inherit;padding:0}

/* ambiguity notes */
.notes{border-top:1px solid var(--line);padding:10px 14px;display:flex;flex-direction:column;gap:7px;background:var(--out)}
.notes[hidden]{display:none}
.notes p{margin:0;font:500 12.5px/1.5 var(--sans);color:var(--warn);display:flex;gap:6px;align-items:flex-start}
.notes p b{font-family:var(--han);font-weight:500}
.notes .w{flex:none}

.legend{display:flex;flex-wrap:wrap;gap:8px 18px;font-size:13px;color:var(--muted);padding:14px 4px 2px}
.legend span{display:inline-flex;align-items:center;gap:7px}
.sw{width:16px;height:12px;border-radius:3px;display:inline-block;flex:none}
.sw-c{background:var(--tint);box-shadow:inset 0 -2px 0 rgba(67,97,238,.45)}
.sw-v{background:var(--dai-tint);box-shadow:inset 0 -2px 0 var(--dai)}
.sw-a{background:var(--warn-bg);box-shadow:inset 0 -2px 0 var(--warn-line)}
.rule{margin:12px 2px 0;padding:10px 14px;background:var(--rule);border-radius:10px;font-size:13.5px;color:var(--muted)}
.rule b{color:var(--ink);font-family:var(--han);font-weight:500}

/* seo */
section.seo{padding:56px 0 8px}
section.seo h2{text-align:center}
h2{font:700 clamp(22px,4.5vw,28px)/1.25 var(--sans);letter-spacing:-.025em;margin:0 0 14px}
.about{max-width:40em;margin:0 auto;color:var(--ink);font-size:17px;line-height:1.75}
.faq{margin:44px auto 0;max-width:46em}
details{border-top:1px solid var(--line)}
details:last-of-type{border-bottom:1px solid var(--line)}
summary{list-style:none;cursor:pointer;padding:16px 36px 16px 0;font-weight:600;position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:6px;top:12px;font:400 24px/1.4 var(--sans);color:var(--seal);transition:transform .2s}
details[open] summary::after{transform:rotate(45deg)}
details p{margin:0 0 18px;color:var(--muted);max-width:40em}
details .han{font-family:var(--han);color:var(--ink)}

footer{margin-top:64px;border-top:1px solid var(--line);padding:26px 0 40px;text-align:center;color:var(--muted);font-size:13px}
footer .fb{margin:0;font:500 14px/1.5 var(--sans);color:var(--muted)}
footer .fb a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line)}
footer .fb a:hover{color:var(--seal);border-bottom-color:var(--seal)}
.noscript{margin:20px auto;text-align:center;color:var(--muted);font-size:14px}

@media (max-width:640px){
  .privacy{padding:4px 10px;font-size:12px}
  .privacy .full{display:none}
  .privacy .short{display:inline}
  .hero{padding:30px 0 22px}
  .tool{padding:12px;border-radius:14px}
  textarea,.res{font-size:19px;min-height:170px;padding:12px}
  .bar{gap:8px 10px}
  .seg{width:100%;justify-content:space-between}
  .seg button{flex:1;padding:8px 6px;font-size:13px}
  .bar b{width:100%}
  .swap{width:42px;height:42px}
  section.seo{padding:40px 0 8px}
  .about{font-size:16px}
  footer{margin-top:44px}
}
@media (max-width:400px){
  .brand{font-size:15px}
  .seal{width:28px;height:28px}
  .tbtn{width:36px;height:36px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}