/* 砥刃 AI工具站 · 国内版 · 设计系统 v2 */
:root{
  --ink:#0e1621; --ink-2:#26323f; --sub:#57626f; --muted:#8b95a2;
  --line:#e9e5de; --line-2:#f1eee9;
  --bg:#f6f4f0; --surface:#ffffff; --surface-2:#fbf9f6;
  --brand:#c2410c; --brand-d:#9a3412; --brand-l:#fde5d1; --gold:#e2982e;
  --steel:#2c5876; --steel-l:#e8f1f7;
  --dark:#0f1a26; --dark-2:#16232f;
  --ok:#2f7d54;
  --radius:16px; --radius-sm:10px; --radius-lg:22px;
  --shadow-sm:0 1px 2px rgba(15,26,38,.06);
  --shadow:0 10px 30px rgba(15,26,38,.09);
  --shadow-lg:0 24px 60px rgba(15,26,38,.16);
  --maxw:1120px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink-2);font-family:var(--font);
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:var(--brand);text-decoration:none}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{color:var(--ink);letter-spacing:.2px}

/* ---------- 布局 ---------- */
.cn-shell{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.cn-main{padding:0}

/* ---------- 顶栏 ---------- */
.cn-topbar{height:4px;background:linear-gradient(90deg,var(--brand),var(--gold) 55%,var(--steel))}
.cn-nav{position:sticky;top:0;z-index:40;display:flex;align-items:center;justify-content:space-between;
  gap:16px;flex-wrap:wrap;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);padding:13px 0}
.cn-brand{display:flex;align-items:center;gap:11px;font-weight:800;color:var(--ink);text-decoration:none}
.cn-mark{width:38px;height:38px;border-radius:11px;flex:0 0 38px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,#2b3d4d,#101a25);box-shadow:0 4px 12px rgba(15,26,38,.28),inset 0 0 0 1px rgba(255,255,255,.08)}
.cn-mark svg{width:22px;height:22px;display:block}
.cn-brand .bt{display:flex;flex-direction:column;line-height:1.15}
.cn-brand .bt b{font-size:18px;letter-spacing:.4px}
.cn-brand .bt span{font-size:10px;font-weight:700;letter-spacing:.22em;color:var(--brand);text-transform:uppercase}
.cn-nav nav{display:flex;gap:4px;flex-wrap:wrap;font-size:14.5px}
.cn-nav nav a{color:var(--sub);padding:8px 14px;border-radius:9px;transition:.16s;font-weight:600}
.cn-nav nav a:hover{color:var(--brand);background:var(--brand-l)}
.cn-nav nav a.active{color:#fff;background:linear-gradient(135deg,var(--brand),var(--gold));box-shadow:var(--shadow-sm)}

/* ---------- Hero（深色高级感） ---------- */
.cn-hero{position:relative;overflow:hidden;margin:22px 0 26px;border-radius:var(--radius-lg);
  background:radial-gradient(120% 140% at 88% 8%,#20303f 0%,#101c27 45%,#0b141d 100%);
  box-shadow:var(--shadow-lg)}
.cn-hero::before{content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:44px 44px;mask-image:radial-gradient(120% 100% at 70% 0%,#000 20%,transparent 78%)}
.cn-hero::after{content:"";position:absolute;right:-90px;top:-90px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(226,152,46,.34),transparent 62%);filter:blur(6px)}
.cn-hero .inner{position:relative;z-index:2;display:grid;grid-template-columns:1.15fr .85fr;gap:28px;
  align-items:center;padding:52px 48px}
.cn-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:700;letter-spacing:.16em;
  color:#ffd7ab;background:rgba(226,152,46,.14);border:1px solid rgba(226,152,46,.35);
  padding:6px 13px;border-radius:999px;margin-bottom:18px;text-transform:uppercase}
.cn-eyebrow i{width:6px;height:6px;border-radius:50%;background:var(--gold);box-shadow:0 0 10px var(--gold)}
.cn-hero h1{margin:0 0 14px;font-size:46px;line-height:1.14;color:#fff;letter-spacing:1px;font-weight:800}
.cn-hero h1 em{font-style:normal;background:linear-gradient(100deg,var(--gold),#ffd9a1);-webkit-background-clip:text;background-clip:text;color:transparent}
.cn-hero .lead{margin:0 0 26px;color:#c3cdd8;font-size:17px;max-width:560px;line-height:1.8}
.cn-cta{display:flex;gap:12px;flex-wrap:wrap}
.cn-btn{display:inline-flex;align-items:center;gap:8px;padding:13px 24px;border-radius:11px;font-weight:700;
  font-size:15px;transition:.18s;cursor:pointer;border:1px solid transparent}
.cn-btn.primary{background:linear-gradient(135deg,var(--brand),var(--gold));color:#fff;box-shadow:0 10px 26px rgba(194,65,12,.35)}
.cn-btn.primary:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(194,65,12,.45)}
.cn-btn.onDark{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.22)}
.cn-btn.onDark:hover{background:rgba(255,255,255,.16)}
.cn-btn.ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.cn-btn.ghost:hover{border-color:var(--brand);color:var(--brand)}
.cn-hero .art{position:relative;display:flex;align-items:center;justify-content:center;min-height:320px}
.cn-hero .art .halo{position:absolute;width:330px;height:330px;border-radius:50%;
  background:radial-gradient(circle,rgba(226,152,46,.28),transparent 66%)}
.cn-hero .art img{position:relative;z-index:2;max-height:360px;width:auto;filter:drop-shadow(0 26px 40px rgba(0,0,0,.5))}
.cn-hero .chip{position:absolute;z-index:3;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);
  color:#eaf1f7;font-size:12.5px;font-weight:600;padding:7px 13px;border-radius:10px;backdrop-filter:blur(6px)}
.cn-hero .chip.c1{left:2%;bottom:16%}
.cn-hero .chip.c2{right:4%;top:14%}

/* ---------- 信任条 ---------- */
.cn-trust{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:-4px 0 30px}
.cn-trust .t{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 20px;box-shadow:var(--shadow-sm);position:relative;overflow:hidden}
.cn-trust .t::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(var(--brand),var(--gold))}
.cn-trust .t b{display:block;font-size:22px;color:var(--ink);line-height:1.25;font-weight:800}
.cn-trust .t span{font-size:13px;color:var(--sub)}

/* ---------- 区块标题 ---------- */
.cn-sec-h{display:flex;align-items:baseline;gap:12px;font-size:24px;color:var(--ink);margin:46px 0 4px;font-weight:800}
.cn-sec-h::before{content:"";width:6px;height:22px;border-radius:3px;background:linear-gradient(var(--brand),var(--gold));align-self:center}
.cn-sec-h small{font-size:13px;font-weight:600;color:var(--muted);letter-spacing:.02em}
.cn-sec-sub{color:var(--sub);font-size:14.5px;margin:6px 0 18px;padding-left:18px}

/* ---------- 四大板块 ---------- */
.cn-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin:14px 0}
.cn-grid.two{grid-template-columns:repeat(2,1fr)}
.cn-card{display:block;border:1px solid var(--line);border-radius:var(--radius);padding:22px;background:var(--surface);
  text-decoration:none;color:inherit;transition:.2s;box-shadow:var(--shadow-sm);position:relative}
.cn-card:hover{border-color:#e4c3a6;box-shadow:var(--shadow);transform:translateY(-3px)}
.cn-block{display:flex;gap:15px;align-items:flex-start}
.cn-block .ic{flex:0 0 44px;width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,var(--brand-l),#fff);border:1px solid #f3ddc6;color:var(--brand)}
.cn-block .ic svg{width:22px;height:22px;display:block}
.cn-block h3{margin:1px 0 5px;font-size:17px;font-weight:800}
.cn-block p{margin:0;color:var(--sub);font-size:14px;line-height:1.65}
.cn-card .arrow{position:absolute;right:18px;top:18px;color:#d8c3ad;transition:.2s}
.cn-card:hover .arrow{color:var(--brand);transform:translate(3px,-3px)}

/* ---------- 产品展示 ---------- */
.cn-prod-feature{display:grid;grid-template-columns:1.05fr 1fr;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);margin:16px 0}
.cn-prod-feature .pf-img{position:relative;background:#ffffff;display:flex;align-items:center;justify-content:center;min-height:340px;padding:26px;border-right:1px solid var(--line-2)}
.cn-prod-feature .pf-img img{width:100%;height:100%;max-height:430px;object-fit:contain;mix-blend-mode:multiply}
.cn-prod-feature .pf-body{padding:34px 32px}
.cn-prod-feature h3{margin:10px 0 12px;font-size:24px;font-weight:800}
.cn-prod-feature p{color:var(--sub);font-size:15px;line-height:1.8;margin:0 0 16px}
.cn-tag{display:inline-block;font-size:12px;font-weight:700;color:var(--brand-d);background:var(--brand-l);
  padding:4px 11px;border-radius:999px}
.spec{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 18px;padding:0;list-style:none}
.spec li{font-size:12.5px;font-weight:600;color:var(--steel);background:var(--steel-l);
  border:1px solid #d5e5f0;padding:5px 11px;border-radius:8px}
.cn-prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:16px 0}
.cn-prod{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow-sm);transition:.2s;display:flex;flex-direction:column}
.cn-prod:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.cn-prod .pic{aspect-ratio:1/1;background:#ffffff;overflow:hidden;display:flex;align-items:center;justify-content:center;padding:20px;border-bottom:1px solid var(--line-2)}
.cn-prod .pic img{width:100%;height:100%;object-fit:contain;transition:.35s;mix-blend-mode:multiply}
.cn-prod:hover .pic img{transform:scale(1.06)}
.cn-prod .pd{padding:18px 18px 20px}
.cn-prod h4{margin:9px 0 8px;font-size:16.5px;font-weight:800}
.cn-prod p{margin:0;color:var(--sub);font-size:13.8px;line-height:1.7}

/* ---------- 知识卡片 ---------- */
.cn-card h3{margin:0 0 8px;font-size:17px;font-weight:800;line-height:1.42}
.cn-card p{margin:0;color:var(--sub);font-size:14.5px;line-height:1.72}
.cn-card .more{display:inline-block;margin-top:13px;color:var(--brand);font-weight:700;font-size:14px}
.cn-card .cn-tag{margin-bottom:10px}

/* ---------- 说明条 ---------- */
.cn-note-bar{display:flex;gap:14px;align-items:flex-start;background:#fffdf8;border:1px solid #f0e2cd;
  border-left:4px solid var(--gold);border-radius:12px;padding:16px 20px;color:var(--sub);font-size:14px;margin:18px 0;line-height:1.75}
.cn-note-bar b{color:var(--ink-2)}

/* ---------- 文章排版 ---------- */
.cn-post{max-width:790px;margin:26px auto 0;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);padding:36px 40px;box-shadow:var(--shadow-sm)}
.cn-post h1{font-size:28px;line-height:1.34;margin:0 0 12px;font-weight:800}
.cn-post .lead{color:var(--muted);font-size:14.5px;margin:0 0 24px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.cn-post h2{font-size:21px;margin:32px 0 12px;padding-left:14px;position:relative;font-weight:800}
.cn-post h2::before{content:"";position:absolute;left:0;top:3px;bottom:3px;width:5px;border-radius:3px;background:linear-gradient(var(--brand),var(--gold))}
.cn-post h3{font-size:17px;margin:22px 0 8px;color:var(--ink-2);font-weight:800}
.cn-post p{margin:0 0 14px;color:var(--ink-2)}
.cn-post ul,.cn-post ol{margin:0 0 16px;padding-left:22px}
.cn-post li{margin:6px 0}
.cn-post a{color:var(--brand);border-bottom:1px solid var(--brand-l)}
.cn-post strong{color:var(--ink)}
.cn-post blockquote{margin:16px 0;padding:14px 20px;background:#fffdf8;border-left:4px solid var(--gold);border-radius:8px;color:var(--sub)}
.cn-post table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px;overflow:hidden;border-radius:10px}
.cn-post th,.cn-post td{border:1px solid var(--line);padding:11px 13px;text-align:left}
.cn-post th{background:#f6f3ee;color:var(--ink);font-weight:800}
.cn-post tr:nth-child(even) td{background:#fbfaf8}
.cn-post img{margin:18px auto;border-radius:var(--radius-sm);box-shadow:var(--shadow-sm)}
.cn-post hr{border:none;border-top:1px solid var(--line);margin:26px 0}
.cn-post figcaption{text-align:center;color:var(--muted);font-size:13px}

/* ---------- 正文通用 ---------- */
.cn-doc{max-width:820px;margin:26px auto 0}
.cn-doc h2{margin-top:34px}
.cn-doc p{color:var(--ink-2)}
.cn-doc ol,.cn-doc ul{padding-left:22px}
.cn-doc li{margin:7px 0}

/* ---------- 页脚 ---------- */
.cn-footer{margin-top:64px;background:var(--dark);color:#93a2b2}
.cn-footer .fin{max-width:var(--maxw);margin:0 auto;padding:46px 24px 30px}
.cn-footer .fgrid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:28px;margin-bottom:30px}
.cn-footer .fcol b{display:block;color:#fff;font-size:15px;margin-bottom:14px;font-weight:800}
.cn-footer .fcol a{display:block;color:#93a2b2;font-size:14px;padding:4px 0;transition:.15s}
.cn-footer .fcol a:hover{color:var(--gold)}
.cn-footer .fbrand{display:flex;align-items:center;gap:11px;margin-bottom:14px}
.cn-footer .fbrand .cn-mark{background:linear-gradient(140deg,#2b3d4d,#0b1219)}
.cn-footer .fbrand b{color:#fff;font-size:17px}
.cn-footer .fdesc{font-size:13.5px;line-height:1.85;color:#8291a1;max-width:360px}
.cn-footer .fbar{border-top:1px solid rgba(255,255,255,.08);padding-top:20px;display:flex;flex-wrap:wrap;
  gap:8px 20px;align-items:center;font-size:13px;color:#7d8b9b}
.cn-footer .fbar a{color:#a9b6c4}
.cn-footer .fbar a:hover{color:var(--gold)}
.cn-footer .fnote{font-size:12.5px;color:#66727f;margin-top:8px;line-height:1.8}

/* ---------- 响应式 ---------- */
@media(max-width:900px){
  .cn-hero .inner{grid-template-columns:1fr;padding:40px 30px;gap:10px}
  .cn-hero h1{font-size:36px}
  .cn-hero .art{min-height:240px;order:-1}
  .cn-hero .art img{max-height:240px}
  .cn-trust{grid-template-columns:repeat(2,1fr)}
  .cn-prod-feature{grid-template-columns:1fr}
  .cn-prod-grid{grid-template-columns:repeat(2,1fr)}
  .cn-footer .fgrid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .cn-shell{padding:0 16px}
  .cn-hero .inner{padding:32px 20px}
  .cn-hero h1{font-size:30px}
  .cn-hero .chip{display:none}
  .cn-trust{grid-template-columns:1fr 1fr;gap:10px}
  .cn-trust .t{padding:14px}
  .cn-trust .t b{font-size:18px}
  .cn-grid,.cn-grid.two,.cn-prod-grid{grid-template-columns:1fr}
  .cn-post{padding:24px 20px}
  .cn-sec-h{font-size:20px}
  .cn-footer .fgrid{grid-template-columns:1fr}
}