:root{
  --paper:#F5EDDD;
  --paper-2:#EFE4D0;
  --ink:#33271B;
  --ink-soft:#5E4C39;
  --muted:#8A7659;
  --clay:#C56843;
  --clay-deep:#A9512F;
  --ochre:#D69A3C;
  --sage:#7A8B6A;
  --line:#E0D2BB;
  --radius:20px;
  --maxw:1140px;
  --soft:0 14px 30px -16px rgba(122,90,58,.45);
  --font:"PingFang SC","Microsoft YaHei","Segoe UI","Helvetica Neue",Arial,sans-serif;
  --round:"YouYuan","幼圆","Yuanti SC","PingFang SC","Microsoft YaHei","Trebuchet MS",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  font-family:var(--font);color:var(--ink);line-height:1.85;-webkit-font-smoothing:antialiased;
  background-color:var(--paper);
  /* 细颗粒纸纹理 */
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.045'/%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 28px;}
.narrow{max-width:780px;}

h1,h2,h3,h4,.eyebrow,.btn,.nav-links,.steps li::before{font-family:var(--round);}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(245,237,221,.86);backdrop-filter:saturate(150%) blur(10px);border-bottom:1.5px solid var(--line);}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px;}
.brand img{height:40px;width:auto;}
.nav-links{display:flex;gap:28px;font-size:15.5px;color:var(--ink-soft);}
.nav-links a{padding:4px 2px;border-bottom:2px solid transparent;transition:color .2s,border-color .2s;}
.nav-links a:hover{color:var(--clay-deep);border-color:var(--clay);}

/* Hero */
.hero{padding:80px 0 70px;}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:50px;align-items:center;}
.eyebrow{display:inline-block;font-size:14px;color:var(--clay-deep);background:#F0DEC8;border:1.5px solid #E3C9A8;padding:5px 15px;border-radius:999px;margin-bottom:22px;transform:rotate(-1deg);}
h1{font-size:clamp(32px,4.4vw,50px);line-height:1.22;font-weight:700;letter-spacing:.01em;margin-bottom:22px;}
.lede{font-size:19px;color:var(--ink-soft);max-width:33em;margin-bottom:30px;}
.cta-row{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:22px;}
.btn{display:inline-block;padding:13px 28px;border-radius:14px;font-weight:700;font-size:16px;border:2px solid var(--ink);transition:transform .15s ease,box-shadow .2s ease,background .2s;}
.btn-primary{background:var(--clay);color:#FBF4E8;box-shadow:4px 4px 0 var(--ink);}
.btn-primary:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--ink);}
.btn-api{background:var(--ink);color:#FBF4E8;box-shadow:4px 4px 0 var(--clay-deep);}
.btn-api:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--clay-deep);}
.btn-ghost{background:var(--paper);color:var(--ink);box-shadow:4px 4px 0 rgba(51,39,27,.18);}
.btn-ghost:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 rgba(51,39,27,.22);}
.trust{font-size:14.5px;color:var(--muted);}
.hero-art{transform:rotate(1.6deg);}
.hero-art img{border-radius:24px;}

/* Sections */
.section{padding:84px 0;}
.section-tint{background:var(--paper-2);border-top:1.5px solid var(--line);border-bottom:1.5px solid var(--line);}
h2{font-size:clamp(26px,3.2vw,36px);font-weight:700;line-height:1.3;margin-bottom:16px;position:relative;display:inline-block;}
/* 手绘下划线 */
h2::after{content:"";position:absolute;left:0;right:0;bottom:-8px;height:7px;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='7'%3E%3Cpath d='M2 4 q30 -5 58 0 t58 0' fill='none' stroke='%23C56843' stroke-width='3' stroke-linecap='round'/%3E%3C/svg%3E") repeat-x left center/120px 7px;opacity:.85;}
h3{font-size:clamp(18px,2vw,22px);font-weight:700;margin:22px 0 9px;}
h4{font-size:16px;font-weight:700;color:var(--clay-deep);margin:16px 0 5px;}
.section p{color:var(--ink-soft);font-size:17px;margin-bottom:14px;}
#intro .narrow > h2{margin-bottom:26px;}

/* Ability — asymmetric two columns */
.ability-grid{display:grid;grid-template-columns:.92fr 1.08fr;gap:54px;align-items:start;}
.ability-lead{position:sticky;top:96px;}
.ability-lead p{margin-top:18px;color:var(--muted);font-size:17px;}
.ability-art{margin-top:26px;transform:rotate(-1.4deg);}
.ability-art img{border-radius:18px;box-shadow:var(--soft);}
.ability-list{display:flex;flex-direction:column;gap:18px;}
.cell{background:var(--paper);border:2px solid var(--ink);border-radius:16px;padding:22px 24px;box-shadow:5px 5px 0 rgba(51,39,27,.12);transition:transform .15s ease,box-shadow .2s ease;}
.cell:nth-child(even){transform:rotate(.5deg);}
.cell:nth-child(odd){transform:rotate(-.5deg);}
.cell:hover{transform:translate(-2px,-2px) rotate(0deg);box-shadow:7px 7px 0 rgba(51,39,27,.16);}
.cell h3{margin-top:0;}
.cell p{font-size:15.5px;margin-bottom:0;}

/* Why — hand-cut cards */
.why-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:34px;}
.why-card{background:var(--paper);border:2px solid var(--ink);border-radius:18px;padding:24px 24px 24px 26px;box-shadow:5px 5px 0 rgba(51,39,27,.12);transition:transform .15s ease,box-shadow .2s ease;}
.why-card:nth-child(odd){transform:rotate(-.7deg);}
.why-card:nth-child(even){transform:rotate(.7deg);}
.why-card:hover{transform:translate(-2px,-2px) rotate(0deg);box-shadow:7px 7px 0 rgba(51,39,27,.16);}
.why-card h3{margin-top:0;}
.why-card h3::before{content:"✿ ";color:var(--ochre);}
.why-card p{margin:0;font-size:15.5px;}

/* Who */
.feature{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center;}
.feature-art{transform:rotate(-1.6deg);}
.feature-art img{border-radius:18px;box-shadow:var(--soft);}
#who .feature-text h3{padding-left:18px;border-left:4px solid var(--clay);border-radius:2px;}

/* Steps — like a handwritten checklist */
.steps{list-style:none;counter-reset:step;margin:30px 0 44px;display:grid;gap:18px;}
.steps li{position:relative;padding:20px 26px 20px 76px;background:var(--paper);border:2px solid var(--ink);border-radius:16px;box-shadow:4px 4px 0 rgba(51,39,27,.12);}
.steps li:nth-child(odd){transform:rotate(-.5deg);}
.steps li:nth-child(even){transform:rotate(.5deg);}
.steps li::before{counter-increment:step;content:counter(step);position:absolute;left:20px;top:18px;width:38px;height:38px;border-radius:50%;background:var(--ochre);color:var(--ink);font-weight:700;font-size:18px;display:grid;place-items:center;border:2px solid var(--ink);}
.steps h3{margin:0 0 3px;}
.steps p{margin:0;font-size:16px;}

/* CTA banner */
.cta-banner{text-align:center;background:var(--clay);color:#FBF4E8;border:2.5px solid var(--ink);border-radius:24px;padding:46px 32px;box-shadow:8px 8px 0 var(--ink);}
.cta-banner h3{color:#FBF4E8;margin-top:0;font-size:24px;}
.cta-banner p{color:#FCE9D6;margin-bottom:24px;}
.cta-banner .btn-primary{background:var(--paper);color:var(--ink);box-shadow:4px 4px 0 var(--ink);}

/* Footer */
.site-footer{background:#2C2117;color:#D8C6AC;padding:54px 0 28px;border-top:3px solid var(--clay);}
.footer-grid{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;padding-bottom:30px;border-bottom:1.5px solid #463525;}
.footer-brand img{height:38px;margin-bottom:14px;}
.footer-brand p{max-width:30em;font-size:15px;}
.footer-links{display:flex;flex-direction:column;gap:10px;font-size:15px;}
.footer-links a:hover{color:var(--ochre);}
.footer-bottom{padding-top:20px;font-size:13.5px;color:#A08E76;}

/* Responsive */
@media (max-width:880px){
  .nav-links{display:none;}
  .hero-grid,.feature,.ability-grid{grid-template-columns:1fr;gap:34px;}
  .hero-art,.feature-art,.ability-art{transform:none;}
  .ability-lead{position:static;}
  .feature-art{order:-1;}
  .why-grid{grid-template-columns:1fr;}
  .section{padding:56px 0;}
  .hero{padding:48px 0 40px;}
}