/* 校对助手共享设计令牌与基础样式（landing 与门户共用） */
:root{
  /* canvas —— 暖米 */
  --canvas:#faf8f3;
  --canvas-soft:#f4f0e8;
  --surface:#efe9de;
  --surface-strong:#e8e0d2;
  --hairline:#e6dfd2;
  --hairline-soft:#efe9de;
  --hairline-strong:#d8cfbe;
  /* ink —— 暖墨 */
  --ink:#1a1815;
  --body:#3a3631;
  --muted:#6c665c;
  --muted-soft:#8e8779;
  /* accent —— 朱砂 */
  --accent:#c8553d;
  --accent-active:#a9442f;
  --accent-soft:#f3e2db;
  --on-accent:#ffffff;
  --ink-hover:#0c0b09;
  /* dark —— 产品 mockup */
  --dark:#181715;
  --dark-soft:#1f1e1b;
  --dark-elev:#252320;
  --on-dark:#faf8f3;
  --on-dark-soft:#a09d93;
  --success:#5db872;
  --radius-md:8px;
  --radius-lg:12px;
  --radius-xl:16px;
  --radius-pill:9999px;
  --serif:"Noto Serif SC","Songti SC","SimSun",serif;
  --sans:"Noto Sans SC",-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,"SF Mono",Menlo,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--canvas);
  color:var(--body);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
::selection{background:var(--accent);color:var(--on-accent)}
a{color:inherit;text-decoration:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 32px}
.section{padding:96px 0}
.eyebrow{
  font-family:var(--sans);
  font-size:13px;font-weight:500;
  letter-spacing:.16em;
  color:var(--accent);
  text-transform:none;
  margin-bottom:20px;
  display:inline-flex;align-items:center;gap:8px;
}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--accent);display:inline-block}
h1,h2,h3{font-family:var(--serif);font-weight:400;color:var(--ink);letter-spacing:-.015em}
.display-xl{font-size:clamp(40px,7vw,72px);line-height:1.08;letter-spacing:-.03em;font-weight:400}
.display-lg{font-size:clamp(32px,4.6vw,52px);line-height:1.12;letter-spacing:-.025em;font-weight:400}
.display-md{font-size:clamp(26px,3vw,36px);line-height:1.18;letter-spacing:-.02em;font-weight:400}
.lead{font-size:19px;line-height:1.6;color:var(--body);max-width:640px}
.muted{color:var(--muted)}

/* nav */
nav.top{
  position:sticky;top:0;z-index:50;
  background:rgba(250,248,243,.82);
  backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--hairline-soft);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-weight:500;font-size:20px;color:var(--ink);letter-spacing:-.015em}
.brand .mark{
  width:22px;height:22px;border-radius:6px;
  background:var(--accent);
  display:inline-flex;align-items:center;justify-content:center;
  color:var(--on-accent);font-family:var(--serif);font-weight:500;font-size:14px;
  box-shadow:0 0 0 3px var(--canvas),0 0 0 4px var(--accent-soft);
}
.nav-links{display:flex;align-items:center;gap:28px;font-size:14px;font-weight:500;color:var(--muted)}
.nav-links a{transition:color .15s}
.nav-links a:hover{color:var(--ink)}
.nav-cta{display:flex;align-items:center;gap:12px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--sans);font-size:14px;font-weight:500;line-height:1;
  padding:11px 20px;border-radius:var(--radius-md);
  border:1px solid transparent;cursor:pointer;transition:all .15s;
  height:40px;
}
.btn-primary{background:var(--ink);color:var(--on-accent)}
.btn-primary:hover{background:var(--ink-hover)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--hairline)}
.btn-ghost:hover{background:var(--surface)}
.btn-on-dark{background:var(--dark-elev);color:var(--on-dark);border-color:#3a3833}
.btn-on-dark:hover{background:#322f2a}
.link{color:var(--accent);font-weight:500;border-bottom:1px solid transparent;transition:border-color .15s}
.link:hover{border-color:var(--accent)}

/* hero */
.hero{padding:104px 0 88px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center}
.hero h1{margin-bottom:28px}
.hero h1 em{font-style:normal;color:var(--accent);font-weight:400}
.hero .lead{margin-bottom:32px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:24px}
.hero-meta{font-size:13px;color:var(--muted-soft);display:flex;gap:18px;flex-wrap:wrap}
.hero-meta span{display:inline-flex;align-items:center;gap:6px}
.dot{width:6px;height:6px;border-radius:50%;background:var(--success)}

/* code window mockup */
.code-card{
  background:var(--dark);color:var(--on-dark);
  border-radius:var(--radius-xl);
  padding:0;overflow:hidden;
  box-shadow:0 1px 0 rgba(255,255,255,.04) inset,0 24px 60px -28px rgba(24,23,21,.45);
}
.code-bar{display:flex;align-items:center;gap:8px;padding:14px 18px;background:var(--dark-soft);border-bottom:1px solid #2c2a26}
.code-bar .dots{display:flex;gap:6px}
.code-bar .dots i{width:11px;height:11px;border-radius:50%;background:#3a3733;display:inline-block}
.code-bar .dots i:nth-child(1){background:#e0625a}
.code-bar .dots i:nth-child(2){background:#e0c24a}
.code-bar .dots i:nth-child(3){background:#5db872}
.code-bar .file{font-family:var(--mono);font-size:12px;color:var(--on-dark-soft);margin-left:6px}
.code-body{padding:22px 22px 24px;font-family:var(--mono);font-size:13px;line-height:1.7}
.code-body .ln{color:var(--on-dark-soft);opacity:.5;user-select:none;display:inline-block;width:22px;text-align:right;margin-right:14px}
.k{color:#e0a96a}      /* keyword */
.s{color:#9ec9a8}      /* string */
.c{color:var(--on-dark-soft);opacity:.55} /* comment */
.p{color:#d98a72}      /* punct/acc */
.n{color:#c7c4bd}      /* normal */
.h{color:#e0c24a;background:rgba(224,194,74,.12);border-radius:3px;padding:1px 3px}

/* badge */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12px;font-weight:500;letter-spacing:.04em;
  padding:4px 12px;border-radius:var(--radius-pill);
  background:var(--accent-soft);color:var(--accent-active);
}
.badge-dark{background:#2c2a26;color:var(--on-dark)}

/* feature grid */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{
  background:var(--surface);
  border-radius:var(--radius-lg);
  padding:32px;
  border:1px solid var(--hairline);
  transition:border-color .2s,transform .2s;
}
.card:hover{border-color:var(--hairline-strong);background:var(--surface)}
.card .ico{
  width:40px;height:40px;border-radius:10px;
  background:var(--canvas);border:1px solid var(--hairline);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--serif);font-size:20px;color:var(--accent);
  margin-bottom:20px;
}
.card h3{font-size:20px;font-weight:400;margin-bottom:10px}
.card p{font-size:15px;color:var(--muted);line-height:1.6}

/* section header */
.sec-head{max-width:680px;margin-bottom:56px}
.sec-head h2{margin-bottom:18px}
.sec-head p{font-size:18px;color:var(--muted);line-height:1.6}

/* capabilities list */
.caps{display:grid;grid-template-columns:repeat(2,1fr);gap:0;border-top:1px solid var(--hairline)}
.cap{
  display:flex;gap:20px;padding:28px 0;
  border-bottom:1px solid var(--hairline);
  padding-right:24px;
}
.cap:nth-child(odd){padding-right:24px;padding-left:0}
.cap:nth-child(even){padding-left:24px;border-left:1px solid var(--hairline)}
.cap .num{font-family:var(--mono);font-size:12px;color:var(--accent);font-weight:500;flex-shrink:0;width:32px}
.cap h3{font-size:18px;font-weight:400;margin-bottom:6px}
.cap p{font-size:14px;color:var(--muted);line-height:1.6}

/* split feature: API + Skills */
.split{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:stretch}
.panel{
  background:var(--surface);
  border-radius:var(--radius-xl);
  padding:32px;
  display:flex;flex-direction:column;gap:20px;
}
.panel.dark{background:var(--dark);color:var(--on-dark)}
.panel.dark h3{color:var(--on-dark)}
.panel.dark p{color:var(--on-dark-soft)}
.panel h3{font-size:22px;font-weight:400}
.panel p{font-size:15px;color:var(--muted);line-height:1.6}
.panel .mini-code{
  background:var(--dark-soft);border-radius:var(--radius-md);
  padding:16px 18px;font-family:var(--mono);font-size:12.5px;line-height:1.7;
  color:var(--on-dark);overflow-x:auto;
}
.panel.dark .mini-code{background:var(--dark-elev);border:1px solid #2c2a26}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:left}
.stat .v{font-family:var(--serif);font-size:44px;font-weight:400;color:var(--ink);letter-spacing:-.025em;line-height:1}
.stat .v em{color:var(--accent);font-style:normal}
.stat .l{margin-top:10px;font-size:13px;color:var(--muted);line-height:1.5}

/* cta band */
.cta{
  background:var(--ink);color:var(--on-accent);
  border-radius:var(--radius-xl);
  padding:72px 56px;
  display:flex;align-items:center;justify-content:space-between;gap:48px;flex-wrap:wrap;
}
.cta h2{color:var(--on-accent);font-size:clamp(28px,3.4vw,40px);font-weight:400;max-width:640px;letter-spacing:-.025em}
.cta h2 em{font-style:normal;color:var(--accent);font-weight:400}
.cta .btn{background:var(--canvas);color:var(--ink);border-color:transparent}
.cta .btn:hover{background:var(--surface-strong)}
.cta .btn-accent{background:var(--accent);color:var(--on-accent)}
.cta .btn-accent:hover{background:var(--accent-active)}
.cta .sub{font-size:15px;color:rgba(250,248,243,.78);margin-top:14px;max-width:520px;line-height:1.6}

/* footer */
footer{background:var(--dark);color:var(--on-dark-soft);padding:72px 0 40px}
footer .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:48px}
footer .brand{color:var(--on-dark);font-size:20px}
footer .brand .mark{background:var(--accent);box-shadow:0 0 0 3px var(--dark),0 0 0 4px #2c2a26}
footer h4{font-family:var(--sans);font-size:13px;font-weight:500;color:var(--on-dark);margin-bottom:16px;letter-spacing:.04em}
footer ul{list-style:none;display:flex;flex-direction:column;gap:10px}
footer ul a{font-size:14px;color:var(--on-dark-soft);transition:color .15s}
footer ul a:hover{color:var(--on-dark)}
footer .desc{font-size:14px;line-height:1.6;margin-top:16px;max-width:280px}
.foot-bottom{border-top:1px solid #2c2a26;margin-top:56px;padding-top:24px;display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--on-dark-soft);opacity:.7;flex-wrap:wrap;gap:12px}

/* responsive */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:48px}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .split{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr);gap:32px 24px}
  footer .wrap{grid-template-columns:1fr 1fr;gap:40px}
}
@media (max-width:680px){
  .section{padding:64px 0}
  .wrap{padding:0 20px}
  .nav-links{display:none}
  .grid-3{grid-template-columns:1fr}
  .caps{grid-template-columns:1fr}
  .cap:nth-child(even){padding-left:0;border-left:none}
  .stats{grid-template-columns:1fr 1fr}
  .cta{padding:48px 28px;flex-direction:column;align-items:flex-start}
  footer .wrap{grid-template-columns:1fr;gap:32px}
  .hero{padding:64px 0 48px}
}