:root{
  --bg:#fafafa; --surface:#fff; --text:#0a0a0b; --text-2:#3f3f46; --muted:#71717a;
  --border:#e7e7ea; --border-2:#d4d4d8;
  --accent:#4f46e5; --accent-2:#4338ca; --accent-soft:#eef2ff; --accent-line:#c7d2fe;
  --shadow:0 1px 2px rgba(16,24,40,.04),0 1px 3px rgba(16,24,40,.06);
  --shadow-h:0 4px 8px -2px rgba(16,24,40,.06),0 12px 24px -6px rgba(16,24,40,.10);
  --radius:14px;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Inter,"Noto Sans SC","Noto Sans CJK SC",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,monospace;
  color-scheme:light;
}
*{box-sizing:border-box;margin:0;padding:0}
html{background:var(--bg);-webkit-text-size-adjust:100%}
body{font-family:var(--sans);color:var(--text);background:var(--bg);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}
::selection{background:var(--accent);color:#fff}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-2)}
a:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}
.en{color:var(--muted)}
.wrap{max-width:1120px;margin:0 auto;padding:0 32px}

/* sticky nav */
.site-head{position:sticky;top:0;z-index:10;background:rgba(250,250,250,.82);-webkit-backdrop-filter:saturate(180%) blur(12px);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--border)}
.bar{height:60px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;color:var(--text)}
.brand:hover{color:var(--text)}
.brand img{width:28px;height:28px;border-radius:8px}
.brand .name{font-weight:650;font-size:17px;letter-spacing:-.01em}
.site-head nav{display:flex;gap:4px}
.site-head nav a{color:var(--muted);font-size:14.5px;font-weight:500;padding:6px 12px;border-radius:8px;transition:background .15s,color .15s}
.site-head nav a:hover{color:var(--text);background:rgba(0,0,0,.04)}
.site-head nav a[aria-current]{color:var(--text);background:rgba(0,0,0,.05)}

/* hero */
.hero{padding:64px 0 36px}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--accent);background:var(--accent-soft);border:1px solid var(--accent-line);padding:4px 12px;border-radius:999px;letter-spacing:.02em}
.kicker .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 3px rgba(79,70,229,.18)}
.hero h1{font-size:clamp(32px,5.2vw,52px);font-weight:750;letter-spacing:-.025em;line-height:1.15;margin-top:18px}
.hero h1 .wk{color:var(--muted);font-weight:600}
.lede{margin-top:14px;font-size:17px;color:var(--text-2);max-width:640px}
.lede b{color:var(--accent);font-weight:700}

/* cards */
.news{list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.item{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px 24px 20px;box-shadow:var(--shadow);transition:box-shadow .2s,border-color .2s,transform .2s}
.item:hover{box-shadow:var(--shadow-h);border-color:var(--border-2);transform:translateY(-2px)}
.item-top{display:flex;align-items:center;justify-content:space-between}
.num{font-family:var(--mono);font-size:12px;color:#a1a1aa}
.tag{display:inline-flex;align-items:center;font-size:12px;font-weight:600;line-height:1;padding:6px 10px;border-radius:999px;border:1px solid transparent}
.t-model{color:#4338ca;background:#eef2ff;border-color:#e0e7ff}
.t-product{color:#0369a1;background:#f0f9ff;border-color:#e0f2fe}
.t-research{color:#7e22ce;background:#faf5ff;border-color:#f3e8ff}
.t-industry{color:#b45309;background:#fffbeb;border-color:#fef3c7}
.t-policy{color:#be123c;background:#fff1f2;border-color:#ffe4e6}
.t-oss{color:#047857;background:#ecfdf5;border-color:#d1fae5}
.t-other{color:#3f3f46;background:#f4f4f5;border-color:#e4e4e7}
.item h2{font-size:18.5px;font-weight:650;line-height:1.5;letter-spacing:-.005em;margin:14px 0 10px}
.item h2 a{color:var(--text)}
.item h2 a:hover{color:var(--accent)}
.summary{color:var(--text-2);font-size:15px;line-height:1.8}
.why{margin-top:16px;padding:12px 14px;background:var(--accent-soft);border-radius:10px;font-size:14.5px;line-height:1.75;color:#312e81}
.why b{display:block;font-size:12px;font-weight:700;color:var(--accent);letter-spacing:.04em;margin-bottom:2px}
.src{margin-top:auto;padding-top:16px;font-size:13.5px;color:var(--muted)}
.item .why + .src,.item .summary + .src{border-top:1px solid #f1f1f3;margin-top:16px;padding-top:14px}
.src a{font-weight:600}

.pager{display:flex;justify-content:space-between;gap:16px;margin-top:36px;font-size:14.5px;font-weight:500}
.pager a,.pager .muted{padding:10px 16px;border:1px solid var(--border);border-radius:10px;background:var(--surface)}
.pager a:hover{border-color:var(--accent-line);background:var(--accent-soft)}
.pager .muted{color:var(--muted)}

/* archive */
.archive{list-style:none;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.archive li{display:grid;grid-template-columns:130px 1fr;gap:2px 24px;padding:18px 24px;border-top:1px solid var(--border);transition:background .15s}
.archive li:first-child{border-top:0}
.archive li:hover{background:#fcfcfd}
.archive .d{font-family:var(--mono);color:var(--muted);font-size:13.5px;padding-top:2px}
.archive .t{font-size:16.5px;font-weight:600;color:var(--text)}
.archive .t:hover{color:var(--accent)}
.archive .c{grid-column:2;font-size:14px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* 404 */
.center{min-height:56vh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:60px 0}
.center .code{font-size:96px;font-weight:800;letter-spacing:-.04em;line-height:1;background:linear-gradient(135deg,#6366f1,#4338ca);-webkit-background-clip:text;background-clip:text;color:transparent}
.center h1{font-size:24px;font-weight:700;margin:18px 0 6px}
.center p{color:var(--muted)}
.center a{margin-top:24px;display:inline-block;padding:10px 18px;border-radius:10px;background:var(--accent);color:#fff;font-weight:600;font-size:14.5px}
.center a:hover{background:var(--accent-2);color:#fff}

footer{margin-top:72px;padding:28px 0 44px;border-top:1px solid var(--border);color:var(--muted);font-size:13px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

@media (max-width:820px){
  .news{grid-template-columns:1fr}
}
@media (max-width:640px){
  .wrap{padding:0 18px}
  .bar{height:56px}
  .hero{padding:40px 0 24px}
  .lede{font-size:15.5px}
  .item{padding:20px 18px 16px}
  .item h2{font-size:17.5px}
  .archive li{grid-template-columns:1fr;padding:16px 18px}
  .archive .c{grid-column:1;white-space:normal}
  footer{flex-direction:column}
}
@media (prefers-reduced-motion:reduce){.item,.item:hover{transition:none;transform:none}}

@media (prefers-color-scheme:dark){
  :root{--bg:#0b0b0f;--surface:#131318;--text:#f4f4f5;--text-2:#c4c4cc;--muted:#8b8b95;--border:#24242b;--border-2:#34343d;--accent:#818cf8;--accent-2:#a5b4fc;--accent-soft:rgba(129,140,248,.10);--accent-line:rgba(129,140,248,.30);color-scheme:dark}
  .site-head{background:rgba(11,11,15,.78)}
  .site-head nav a:hover,.site-head nav a[aria-current]{background:rgba(255,255,255,.07)}
  .why{color:#c7d2fe}
  .item .why + .src,.item .summary + .src{border-top-color:#1f1f26}
  .archive li:hover{background:#17171d}
  .t-model,.t-product,.t-research,.t-industry,.t-policy,.t-oss,.t-other{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.08)}
  .t-model{color:#a5b4fc}.t-product{color:#7dd3fc}.t-research{color:#d8b4fe}.t-industry{color:#fcd34d}.t-policy{color:#fda4af}.t-oss{color:#6ee7b7}.t-other{color:#d4d4d8}
}