:root{
  --paper:#EFE5CD;
  --paper-2:#E7DBBE;
  --ink:#222634;
  --ink-soft:#403B30;
  --muted:#6E6450;
  --oxblood:#9A4A33;
  --gold:#A6843C;
  --line:#CBBB95;
  --maxw:1120px;
  --serif:Georgia,"Songti SC","SimSun","Times New Roman",serif;
  --serif-cn:"Songti SC","SimSun",Georgia,serif;
  --sans:"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  font-family:var(--sans);color:var(--ink);line-height:1.95;-webkit-font-smoothing:antialiased;
  background-color:var(--paper);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.06'/%3E%3C/svg%3E");
}
img{display:block;max-width:100%;height:auto;}
a{color:inherit;text-decoration:none;}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 30px;}
.narrow{max-width:760px;}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(239,229,205,.92);border-bottom:1px solid var(--ink);}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px;}
.brand img{height:40px;width:auto;}
.nav-links{display:flex;gap:30px;font-family:var(--serif);font-size:15.5px;color:var(--ink-soft);}
.nav-links a{padding:2px 0;border-bottom:1px solid transparent;transition:border-color .2s,color .2s;}
.nav-links a:hover{color:var(--oxblood);border-color:var(--oxblood);}

/* Hero */
.hero{padding:74px 0 64px;border-bottom:1px solid var(--ink);}
.hero-grid{display:grid;grid-template-columns:1.04fr .96fr;gap:50px;align-items:center;}
.eyebrow{display:inline-block;font-family:var(--serif);font-size:13px;letter-spacing:.22em;text-transform:uppercase;color:var(--oxblood);padding-bottom:8px;border-bottom:1px solid var(--oxblood);margin-bottom:22px;}
h1{font-size:clamp(32px,4.4vw,50px);line-height:1.24;font-weight:600;letter-spacing:.005em;margin-bottom:22px;}
.lede{font-size:18.5px;color:var(--ink-soft);max-width:33em;margin-bottom:30px;}
.cta-row{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:22px;align-items:center;}
.btn{display:inline-block;font-family:var(--serif);padding:12px 28px;font-size:16px;font-weight:600;letter-spacing:.02em;border:1.5px solid var(--ink);transition:background .2s,color .2s;}
.btn-primary{background:var(--ink);color:var(--paper);}
.btn-primary:hover{background:var(--oxblood);border-color:var(--oxblood);}
.btn-accent{background:var(--oxblood);color:var(--paper);border-color:var(--oxblood);}
.btn-accent:hover{background:#7e3a26;border-color:#7e3a26;}
.btn-api{background:transparent;color:var(--ink);border-color:var(--ink);}
.btn-api:hover{background:var(--oxblood);color:var(--paper);border-color:var(--oxblood);}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--ink);}
.btn-ghost:hover{background:var(--ink);color:var(--paper);}
.trust{font-size:14.5px;color:var(--muted);font-style:italic;}
.hero-art img{width:100%;}

/* Sections */
.section{padding:80px 0;}
.section-tint{background:var(--paper-2);border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);}
.section-head{text-align:center;max-width:720px;margin:0 auto 46px;}
/* 古典分隔标题 */
h2{font-size:clamp(25px,3vw,35px);line-height:1.32;margin-bottom:18px;}
.section > .container > h2:first-child,.narrow > h2:first-child,.section-head h2{position:relative;}
.section-head h2::before,.section-head h2::after{content:"✶";color:var(--oxblood);font-size:.55em;vertical-align:middle;margin:0 .6em;}
h3{font-size:clamp(18px,1.9vw,22px);margin:24px 0 8px;letter-spacing:.01em;}
h4{font-size:16px;color:var(--oxblood);margin:16px 0 5px;font-style:italic;}
.section p{color:var(--ink-soft);font-size:16.5px;margin-bottom:14px;}
.section-head p{color:var(--muted);font-size:17px;margin:0;font-style:italic;}
/* 段首细规 */
#intro .narrow > h2,#why .narrow > h2,#how .narrow > h2,#faq .narrow > h2{padding-bottom:14px;border-bottom:1px solid var(--line);}

/* Ability */
.ability-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:50px;align-items:start;}
.ability-lead{position:sticky;top:92px;}
.ability-lead h2{padding-bottom:14px;border-bottom:1px solid var(--ink);}
.ability-lead p{margin-top:16px;color:var(--muted);font-style:italic;}
.ability-art{margin-top:24px;}
.ability-list{display:flex;flex-direction:column;}
.cell{padding:20px 0;border-bottom:1px solid var(--line);}
.cell:first-child{padding-top:0;}
.cell:last-child{border-bottom:none;}
.cell h3{margin-top:0;padding-left:26px;position:relative;}
.cell h3::before{content:"✶";position:absolute;left:0;top:0;color:var(--oxblood);font-size:.8em;}
.cell h4{padding-left:26px;}
.cell p{padding-left:26px;font-size:16px;margin-bottom:0;}

/* Why — almanac entries */
.why-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0;margin-top:30px;border-top:1px solid var(--ink);border-left:1px solid var(--line);}
.why-card{padding:24px 26px;border-bottom:1px solid var(--line);border-right:1px solid var(--line);}
.why-card h3{margin-top:0;}
.why-card h3::before{content:"✦ ";color:var(--gold);}
.why-card p{margin:0;font-size:15.5px;color:var(--ink-soft);}

/* Who — night plate */
.section-dark{background:var(--ink);color:#E7DCC2;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);}
.section-dark .section-head h2::before,.section-dark .section-head h2::after{color:var(--gold);}
.section-dark .section-head p{color:#B6AA8C;}
.feature{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center;}
.section-dark h3{color:#F2E9D2;}
.section-dark p{color:#C3B998;}
#who .feature-text h3{padding-left:16px;border-left:2px solid var(--gold);}

/* Steps — numbered almanac list */
.steps{list-style:none;counter-reset:step;margin:28px 0 44px;display:grid;gap:0;border-top:1px solid var(--ink);}
.steps li{position:relative;padding:22px 0 22px 60px;border-bottom:1px solid var(--line);}
.steps li::before{counter-increment:step;content:counter(step,decimal-leading-zero);position:absolute;left:0;top:22px;font-family:var(--serif);font-size:22px;color:var(--oxblood);font-weight:600;}
.steps h3{margin:0 0 3px;}
.steps p{margin:0;font-size:16px;}

/* CTA banner — bordered plate */
.cta-banner{text-align:center;background:var(--paper-2);border:2px solid var(--ink);padding:46px 32px;position:relative;}
.cta-banner::before{content:"";position:absolute;inset:6px;border:1px solid var(--line);pointer-events:none;}
.cta-banner h3{margin-top:0;font-size:24px;}
.cta-banner p{color:var(--muted);margin-bottom:24px;font-style:italic;}

/* Footer */
.site-footer{background:var(--ink);color:#C3B998;padding:52px 0 26px;}
.footer-grid{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;padding-bottom:28px;border-bottom:1px solid #3A3E4C;}
.footer-brand img{height:38px;margin-bottom:14px;}
.footer-brand p{max-width:30em;font-size:15px;font-family:var(--serif);}
.footer-links{display:flex;flex-direction:column;gap:10px;font-size:15px;font-family:var(--serif);}
.footer-links a:hover{color:var(--gold);}
.footer-bottom{padding-top:18px;font-size:13px;color:#8A8068;font-style:italic;}

/* Responsive */
@media (max-width:880px){
  .nav-links{display:none;}
  .hero-grid,.feature,.ability-grid{grid-template-columns:1fr;gap:34px;}
  .ability-lead{position:static;}
  .feature-art{order:-1;}
  .why-grid{grid-template-columns:1fr;}
  .section{padding:56px 0;}
  .hero{padding:46px 0 40px;}
}