:root{
  --clay:#e8743b;
  --clay-deep:#c8551f;
  --clay-soft:#f6d8c4;
  --jade:#4f8467;
  --ink:#2e2721;
  --ink-soft:#6f6257;
  --paper:#fdf7ef;
  --sand:#f4e7d7;
  --line:#e7d5bf;
  --white:#ffffff;
  --r-l:28px;
  --r-m:18px;
  --r-s:12px;
  --shadow:0 20px 44px -32px rgba(90,60,30,.65);
  --shadow-lift:0 28px 52px -30px rgba(90,60,30,.55);
}

*{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,'Segoe UI',sans-serif;
  line-height:1.72;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3{margin:0;line-height:1.25;letter-spacing:-.01em}
p{margin:0}
a{color:inherit}

.wrap{width:min(1120px,calc(100% - 64px));margin-inline:auto}

/* ---------- 页头 ---------- */
.site-head{
  position:sticky;top:0;z-index:30;
  background:rgba(253,247,239,.88);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.head-inner{display:flex;align-items:center;gap:26px;height:72px}
.brand{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:800;text-decoration:none;letter-spacing:.01em}
.mark{width:32px;height:32px;display:grid;place-items:center;color:var(--clay);background:var(--white);border-radius:50%;box-shadow:inset 0 0 0 1.5px var(--line)}
.mark svg{width:22px;height:22px}
.nav{display:flex;gap:26px;margin-left:auto}
.nav a{font-size:15px;color:var(--ink-soft);text-decoration:none;transition:color .2s ease}
.nav a:hover{color:var(--clay-deep)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:15px 28px;border-radius:999px;
  background:linear-gradient(135deg,#f0874c,#e0682b);
  color:#fff;font-weight:700;font-size:16px;text-decoration:none;
  box-shadow:0 16px 28px -16px rgba(224,104,43,.95),inset 0 1px 0 rgba(255,255,255,.35);
  transition:transform .2s ease,box-shadow .2s ease,filter .2s ease;
}
.btn:hover{transform:translateY(-2px);filter:saturate(1.08);box-shadow:0 22px 32px -16px rgba(224,104,43,.95),inset 0 1px 0 rgba(255,255,255,.35)}
.btn:active{transform:translateY(0)}
.btn:focus-visible{outline:3px solid rgba(232,116,59,.4);outline-offset:3px}
.btn-sm{padding:10px 20px;font-size:14px;white-space:nowrap}
.btn-lg{padding:18px 38px;font-size:17px}

/* ---------- 首屏 ---------- */
.hero{
  padding:78px 0 92px;
  background:
    radial-gradient(760px 420px at 84% -8%,rgba(232,116,59,.16),transparent 68%),
    radial-gradient(560px 360px at 2% 14%,rgba(79,132,103,.11),transparent 70%);
}
.hero-inner{display:grid;grid-template-columns:1.06fr .94fr;gap:64px;align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-size:13.5px;color:var(--clay-deep);font-weight:600;
  background:rgba(255,255,255,.75);border:1px solid var(--line);
  padding:7px 16px;border-radius:999px;margin-bottom:26px;
}
.dot{width:7px;height:7px;border-radius:50%;background:var(--clay);box-shadow:0 0 0 4px rgba(232,116,59,.16)}
h1{font-size:clamp(2.35rem,4.6vw,3.9rem);font-weight:800;letter-spacing:-.02em}
h1 em{font-style:normal;position:relative;z-index:0;white-space:nowrap}
h1 em::after{
  content:'';position:absolute;left:-3px;right:-3px;bottom:.08em;height:.36em;
  background:rgba(232,116,59,.26);border-radius:6px;z-index:-1;
}
.lede{margin-top:26px;font-size:17px;color:var(--ink-soft);max-width:31em}
.hero-actions{display:flex;align-items:center;gap:20px;margin-top:34px;flex-wrap:wrap}
.url{font-size:14px;color:var(--ink-soft);letter-spacing:.04em;border-bottom:1px dashed var(--line);padding-bottom:2px}
.ticks{list-style:none;display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:32px 0 0}
.ticks li{font-size:13.5px;color:var(--ink-soft);background:var(--white);border:1px solid var(--line);border-radius:999px;padding:6px 15px}

.hero-board{
  position:relative;aspect-ratio:1/1;border-radius:32px;
  background-image:
    linear-gradient(rgba(150,110,70,.22) 1px,transparent 1px),
    linear-gradient(90deg,rgba(150,110,70,.22) 1px,transparent 1px),
    linear-gradient(150deg,#f3e0c4,#e3c69f);
  background-size:36px 36px,36px 36px,100% 100%;
  box-shadow:0 46px 70px -42px rgba(90,60,30,.8),inset 0 0 0 1px rgba(255,255,255,.6);
}
.hero-board::after{
  content:'';position:absolute;inset:0;border-radius:32px;
  background:radial-gradient(120% 90% at 20% 10%,rgba(255,255,255,.45),transparent 55%);
  pointer-events:none;
}
.piece,.stone{
  position:absolute;width:23%;aspect-ratio:1/1;border-radius:50%;
  display:grid;place-items:center;
  font-weight:800;font-size:clamp(18px,3.1vw,30px);color:#a8451f;
  background:radial-gradient(circle at 32% 26%,#fffaf1,#f2dec2 68%,#dcbf99);
  box-shadow:0 14px 22px -14px rgba(90,60,30,.9),inset 0 0 0 2px #cfa171,inset 0 0 0 7px rgba(255,255,255,.7);
}
.stone{background:radial-gradient(circle at 32% 26%,#6d6058,#2e2721 70%);box-shadow:0 14px 22px -14px rgba(30,20,14,.9),inset 0 0 0 2px #1b1512}
.p1{top:10%;left:11%}
.p2{top:19%;right:13%}
.p3{bottom:13%;right:20%}
.p4b{bottom:23%;left:23%}
.stone.p4{position:absolute;bottom:24%;left:24%;top:auto;right:auto}

/* ---------- 通用区块 ---------- */
.section{padding:88px 0}
.sec-head{max-width:44em;margin-bottom:44px}
.kicker{font-size:13px;font-weight:800;letter-spacing:.18em;color:var(--clay-deep);text-transform:uppercase;margin-bottom:12px}
.sec-head h2{font-size:clamp(1.6rem,3.1vw,2.4rem)}
.sec-sub{margin-top:14px;color:var(--ink-soft);font-size:16px}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{
  background:var(--white);border:1px solid var(--line);border-radius:var(--r-l);
  padding:30px 26px 32px;box-shadow:var(--shadow);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lift);border-color:var(--clay-soft)}
.card-no{display:block;font-size:12.5px;font-weight:800;letter-spacing:.14em;color:var(--clay);margin-bottom:18px}
.card h3{font-size:20px;margin-bottom:10px}
.card p{font-size:15px;color:var(--ink-soft)}

/* ---------- 棋种 ---------- */
.games{background:linear-gradient(180deg,rgba(244,231,215,.5),rgba(253,247,239,0))}
.game-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:start}
.game-card{border-radius:var(--r-l);padding:38px 34px 34px;border:1px solid var(--line);box-shadow:var(--shadow)}
.game-clay{background:linear-gradient(158deg,#fdf1e5,#f8e0cd);border-color:#f1cdb3}
.game-jade{background:linear-gradient(158deg,#eef5ee,#dfeade);border-color:#caddc9;margin-top:38px}
.game-card h3{font-size:clamp(1.5rem,2.6vw,2rem);margin-bottom:14px}
.game-card p{font-size:15.5px;color:#5c5248;max-width:24em}
.tags{display:flex;flex-wrap:wrap;gap:9px;margin-top:24px}
.tags span{font-size:13px;padding:5px 13px;border-radius:999px;background:rgba(255,255,255,.72);border:1px solid rgba(255,255,255,.9);color:var(--ink-soft)}
.game-clay .tags span{color:var(--clay-deep)}
.game-jade .tags span{color:#3d6b52}

/* ---------- 场景 ---------- */
.uses{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:0 48px}
.uses li{padding:26px 0 26px 30px;border-top:1px solid var(--line);position:relative}
.use-mark{position:absolute;left:0;top:32px;width:12px;height:12px;border-radius:3px;background:var(--clay);transform:rotate(45deg)}
.uses h3{font-size:18px;margin-bottom:6px}
.uses p{font-size:15px;color:var(--ink-soft);max-width:26em}

/* ---------- 步骤 ---------- */
.steps{list-style:none;counter-reset:s;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.steps li{background:var(--white);border:1px solid var(--line);border-radius:var(--r-m);padding:26px 24px 28px;box-shadow:var(--shadow)}
.steps li::before{
  counter-increment:s;content:'0' counter(s);
  display:block;font-size:13px;font-weight:800;letter-spacing:.16em;color:var(--clay);margin-bottom:14px;
}
.steps h3{font-size:18px;margin-bottom:8px}
.steps p{font-size:15px;color:var(--ink-soft)}

/* ---------- FAQ ---------- */
.faq .wrap{max-width:860px}
.faq details{
  background:var(--white);border:1px solid var(--line);border-radius:var(--r-m);
  padding:18px 24px;margin-bottom:12px;transition:border-color .2s ease,box-shadow .2s ease;
}
.faq details[open]{border-color:var(--clay-soft);box-shadow:var(--shadow)}
.faq summary{
  cursor:pointer;font-weight:700;font-size:16px;list-style:none;
  display:flex;align-items:center;justify-content:space-between;gap:18px;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'+';color:var(--clay);font-size:22px;font-weight:400;line-height:1}
.faq details[open] summary::after{content:'−'}
.faq details p{margin-top:12px;font-size:15px;color:var(--ink-soft)}

/* ---------- 结尾 CTA ---------- */
.finale{padding:0 0 90px}
.finale-box{
  position:relative;overflow:hidden;text-align:center;color:#fdf7ef;
  background:linear-gradient(148deg,#3c3128,#241d18 72%);
  border-radius:38px;padding:78px 32px 64px;
  box-shadow:0 50px 80px -56px rgba(46,39,33,.95);
}
.finale-box::after{
  content:'';position:absolute;width:460px;height:460px;right:-150px;top:-190px;border-radius:50%;
  background:radial-gradient(circle,rgba(232,116,59,.45),transparent 66%);pointer-events:none;
}
.finale-box::before{
  content:'';position:absolute;width:360px;height:360px;left:-140px;bottom:-180px;border-radius:50%;
  background:radial-gradient(circle,rgba(79,132,103,.4),transparent 66%);pointer-events:none;
}
.finale h2{font-size:clamp(1.9rem,4vw,2.9rem);position:relative}
.finale-sub{margin:16px auto 30px;color:#c9b9ab;font-size:16px;max-width:30em;position:relative}
.finale .btn{position:relative}
.tiny{margin-top:22px;font-size:13px;color:#9c8b7a;letter-spacing:.05em;position:relative}

/* ---------- 页脚 ---------- */
.site-foot{border-top:1px solid var(--line);padding:30px 0 40px;background:var(--sand)}
.foot-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap}
.foot-inner p{font-size:13.5px;color:var(--ink-soft)}
.foot-inner a{font-size:13.5px;color:var(--clay-deep);text-decoration:none;border-bottom:1px solid rgba(200,85,31,.3)}
.foot-inner a:hover{border-bottom-color:var(--clay-deep)}

/* ---------- 移动端 ---------- */
@media (max-width:768px){
  .wrap{width:calc(100% - 36px)}
  .head-inner{height:64px;gap:14px}
  .nav{display:none}
  .site-head .btn-sm{margin-left:auto;padding:9px 16px;font-size:13px}
  .hero{padding:48px 0 60px}
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .eyebrow{font-size:12px;margin-bottom:20px}
  .lede{font-size:16px;margin-top:20px}
  .hero-actions{gap:14px;margin-top:26px}
  .btn{width:100%}
  .hero-actions .btn{width:100%}
  .url{font-size:13px}
  .ticks{margin-top:24px}
  .hero-board{border-radius:26px;max-width:420px}
  .section{padding:60px 0}
  .sec-head{margin-bottom:32px}
  .grid-3,.game-grid,.steps,.uses{grid-template-columns:1fr}
  .game-jade{margin-top:0}
  .uses{gap:0}
  .uses li{padding:22px 0 22px 26px}
  .use-mark{top:28px}
  .finale{padding-bottom:56px}
  .finale-box{border-radius:28px;padding:56px 22px 46px}
  .btn-lg{font-size:16px;padding:16px 26px}
  .foot-inner{flex-direction:column;align-items:flex-start;gap:8px}
}