:root{
  --ink:#1E2A3B;--bg:#F6F4EF;--card:#FFFFFF;--t2:#5B6676;--t3:#8A94A3;--line:#E3DFD6;--link:#35558A;
  --amber:#E8963A;--code-bg:#131923;--code-fg:#E9E6DF;--code-line:#2C3747;--code-muted:#8A94A3;
  --name-bg:#1E2A3B;--name-fg:#E9E6DF;--name-t2:#B7C0CD;--name-line:#34435A;
  --btn-bg:#1E2A3B;--btn-fg:#F6F4EF;--btn-hover:#2A3A50;--tip-bg:#1E2A3B;--tip-fg:#F6F4EF;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans TC",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --wordmark:"DM Sans",var(--sans);--cjk:"Noto Sans TC",var(--sans);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --ink:#E9E6DF;--bg:#131923;--card:#1B2331;--t2:#9AA5B5;--t3:#7F8A9A;--line:#2C3747;--link:#8FB0E6;
    --code-bg:#0E131B;--code-fg:#E9E6DF;--code-line:#2C3747;
    --name-bg:#1B2331;--name-fg:#E9E6DF;--name-t2:#9AA5B5;--name-line:#2C3747;
    --btn-bg:#E9E6DF;--btn-fg:#131923;--btn-hover:#FFFFFF;--tip-bg:#E9E6DF;--tip-fg:#131923;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --ink:#E9E6DF;--bg:#131923;--card:#1B2331;--t2:#9AA5B5;--t3:#7F8A9A;--line:#2C3747;--link:#8FB0E6;
  --code-bg:#0E131B;--code-fg:#E9E6DF;--code-line:#2C3747;
  --name-bg:#1B2331;--name-fg:#E9E6DF;--name-t2:#9AA5B5;--name-line:#2C3747;
  --btn-bg:#E9E6DF;--btn-fg:#131923;--btn-hover:#FFFFFF;--tip-bg:#E9E6DF;--tip-fg:#131923;
  color-scheme:dark;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 var(--sans);-webkit-font-smoothing:antialiased;text-wrap:pretty}
a{color:var(--link);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--amber)}
code,kbd,pre{font-family:var(--mono)}
p code{font-size:.92em;padding:1px 5px;border-radius:4px;background:var(--card);border:1px solid var(--line)}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

.wrap{max-width:1040px;margin:0 auto;padding:0 24px}
.bar{width:40px;height:3px;background:var(--amber);margin:0 0 22px;border-radius:1px}
section{padding:96px 0}
h2{font-size:clamp(26px,3vw,32px);line-height:1.2;letter-spacing:-.015em;font-weight:600;margin:0 0 14px}
.lead{color:var(--t2);font-size:18px;line-height:1.6;max-width:640px;margin:0}

/* top corners */
.top{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 0;font:13px var(--mono);color:var(--t3)}
.top nav{display:flex;gap:22px}
.top a{color:var(--t2);text-decoration:none}
.top a:hover{color:var(--amber)}

/* hero */
.hero{padding:64px 0 104px}
.lockup{display:flex;align-items:center;gap:18px;margin:0 0 64px}
.lockup .mark{width:52px;height:52px;flex:none}
.lockup .word{font:700 32px/1 var(--wordmark);letter-spacing:-.03em}
.lockup .meta{display:flex;align-items:baseline;gap:12px;margin-top:8px}
.lockup .cjk{font:700 13px/1 var(--cjk);letter-spacing:.12em}
.lockup .tailo{font:12px/1 var(--mono);color:var(--t2)}
h1{font-size:clamp(42px,6.5vw,76px);line-height:1.02;letter-spacing:-.03em;font-weight:700;margin:0 0 26px;max-width:14ch}
.sub{font-size:clamp(18px,2vw,22px);line-height:1.5;color:var(--t2);max-width:620px;margin:0 0 44px}
.btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;height:48px;padding:0 22px;border-radius:7px;font:600 15px var(--sans);text-decoration:none;border:1px solid transparent;transition:background .15s,border-color .15s,color .15s}
.btn-primary{background:var(--btn-bg);color:var(--btn-fg)}
.btn-primary:hover{background:var(--btn-hover);color:var(--btn-fg)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--amber);color:var(--ink)}
.btn .ext{font:400 14px var(--mono);opacity:.7}

/* why */
.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:44px}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:28px 24px 30px}
.card .bar{width:24px;margin-bottom:22px}
.card h3{margin:0 0 10px;font-size:19px;line-height:1.3;letter-spacing:-.01em;font-weight:600}
.card p{margin:0;color:var(--t2);font-size:15px;line-height:1.6}

/* quick start */
.cmd{position:relative;display:flex;align-items:baseline;gap:14px;margin-top:40px;background:var(--code-bg);color:var(--code-fg);border:1px solid var(--code-line);border-radius:10px;padding:22px 110px 22px 24px;font:500 16px/1.5 var(--mono);overflow-x:auto}
.cmd .prompt{color:var(--code-muted);user-select:none}
.cmd code{white-space:nowrap}
.copy{position:absolute;top:12px;right:12px;height:32px;padding:0 12px;border-radius:6px;border:1px solid var(--code-line);background:transparent;color:var(--code-fg);font:500 12px var(--mono);cursor:pointer;transition:border-color .15s}
.copy:hover{border-color:var(--amber)}
.copy[data-done="1"]{color:var(--amber);border-color:var(--amber)}
.then{margin:24px 0 0;color:var(--t2);font-size:17px}
.clients{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:28px}
.client{background:var(--card);border:1px solid var(--line);border-radius:10px;overflow:hidden;display:flex;flex-direction:column}
.client header{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line);font:600 14px var(--sans)}
.client header .file{font:400 12px var(--mono);color:var(--t2);margin-left:auto}
.client .body{position:relative;flex:1}
.client pre{margin:0;padding:18px 84px 20px 16px;font:13px/1.6 var(--mono);color:var(--ink);white-space:pre-wrap;word-break:break-all}
.client .copy{border-color:var(--line);color:var(--t2);top:10px;right:10px;background:var(--card)}
.client .copy:hover{border-color:var(--amber);color:var(--ink)}
.tile-s{width:22px;height:22px;border-radius:5px;display:grid;place-items:center;font:700 9px/1 var(--mono);color:#fff;flex:none}

/* formats */
.tiles{display:grid;grid-template-columns:repeat(auto-fill,56px);gap:14px;list-style:none;margin:44px 0 0;padding:0}
.tile{position:relative;display:grid;place-items:center;width:56px;height:56px;border-radius:7px;font:700 14px/1 var(--mono);color:#fff;cursor:default;transition:transform .2s;animation:breathe 7s ease-in-out infinite;animation-delay:var(--d,0s)}
.tile.dk{color:#1E2A3B}
.tile:hover,.tile:focus-visible{transform:scale(1.08);animation-play-state:paused;opacity:1;z-index:2}
.tile::after{content:attr(data-name);position:absolute;top:calc(100% + 9px);left:50%;transform:translate(-50%,-3px);white-space:nowrap;padding:5px 9px;border-radius:5px;background:var(--tip-bg);color:var(--tip-fg);font:500 12px/1 var(--mono);opacity:0;pointer-events:none;transition:opacity .15s,transform .15s}
.tile:hover::after,.tile:focus-visible::after{opacity:1;transform:translate(-50%,0)}
@keyframes breathe{0%,100%{opacity:.78}50%{opacity:1}}

/* features */
.feat{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:40px 32px;margin-top:44px}
.feat h3{margin:0 0 14px;padding-top:14px;border-top:1px solid var(--line);font:600 12px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--t2)}
.feat ul{list-style:none;margin:0;padding:0}
.feat li{padding:5px 0;font-size:15px;line-height:1.5}

/* name */
.name{background:var(--name-bg);color:var(--name-fg)}
.name .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.5fr);gap:72px;align-items:start}
.name h2{color:var(--name-fg)}
.name p{font-size:19px;line-height:1.7;margin:0 0 22px;color:var(--name-t2)}
.name p:last-child{margin-bottom:0}
.name strong{color:var(--name-fg);font-weight:600}
.name .big{width:100%;max-width:240px;height:auto;display:block}
.chars{display:flex;gap:28px;margin-top:40px;padding-top:28px;border-top:1px solid var(--name-line)}
.chars div{display:flex;flex-direction:column;gap:6px}
.chars .c{font:700 36px/1 var(--cjk)}
.chars .r{font:12px/1 var(--mono);color:var(--name-t2)}
.chars .g{font:13px/1.3 var(--sans);color:var(--name-t2)}

/* footer */
footer{border-top:1px solid var(--line);padding:36px 0 48px;font-size:14px;color:var(--t2)}
.foot{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px 32px}
.foot .brand{display:flex;align-items:center;gap:10px;color:var(--ink)}
.foot .brand .word{font:700 16px/1 var(--wordmark);letter-spacing:-.03em}
.foot .brand .cjk{font:700 11px/1 var(--cjk);letter-spacing:.1em;color:var(--t2)}
.foot nav{display:flex;flex-wrap:wrap;gap:8px 24px}
.foot nav a{color:var(--t2);text-decoration:none}
.foot nav a:hover{color:var(--amber)}
.foot .copy-line{width:100%;font:12px var(--mono);color:var(--t3)}

/* reveal (only when JS is present) */
html.js .reveal{opacity:0;transform:translateY(10px);transition:opacity .6s ease,transform .6s ease}
html.js .reveal.in{opacity:1;transform:none}

@media (max-width:1000px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.feat{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:860px){.clients{grid-template-columns:1fr}.name .wrap{grid-template-columns:1fr;gap:44px}}
@media (max-width:640px){
  section{padding:64px 0}.hero{padding:40px 0 72px}
  .cards{grid-template-columns:1fr}.feat{grid-template-columns:1fr;gap:32px}
  .lockup{gap:14px;margin-bottom:44px}.lockup .mark{width:44px;height:44px}.lockup .word{font-size:26px}
  .cmd{padding:60px 20px 20px;font-size:14px}.copy{top:12px;right:12px}
  .btn{height:46px;flex:1 1 auto;justify-content:center}
  .tiles{grid-template-columns:repeat(auto-fill,48px);gap:10px}.tile{width:48px;height:48px;font-size:12px}
  .chars{gap:20px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .tile{animation:none}.tile:hover{transform:none}
  html.js .reveal{opacity:1;transform:none;transition:none}
}

/* theme toggle */
.theme{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;padding:0;border:1px solid var(--line);border-radius:7px;background:transparent;color:var(--t2);cursor:pointer;transition:border-color .15s,color .15s}
.theme:hover{border-color:var(--amber);color:var(--ink)}
.theme .sun{display:none}
:root[data-theme="dark"] .theme .sun{display:block}
:root[data-theme="dark"] .theme .moon{display:none}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) .theme .sun{display:block}
  :root:not([data-theme="light"]) .theme .moon{display:none}
}
.top nav{align-items:center}

/* configuration block */
.conf-h{margin:44px 0 10px;font-size:19px;font-weight:600;letter-spacing:-.01em}
.cmd-block{display:block;padding:22px 24px;font-size:14px}
.cmd-block pre{margin:0;overflow-x:auto}
.cmd-block code{white-space:pre;display:block}
.cmd-block .copy{background:var(--code-bg)}

/* bilingual: both languages live in the markup so the page still reads with
   JavaScript off and a crawler sees both. The head picks one before paint. */
:root[data-lang="en"] .zh{display:none}
:root[data-lang="zh"] .en{display:none}
.lang{padding:0;border:0;background:none;color:var(--t2);font:13px var(--mono);cursor:pointer}
.lang:hover{color:var(--amber)}
:root[data-lang="en"] .lang[data-set-lang="en"],
:root[data-lang="zh"] .lang[data-set-lang="zh"]{display:none}