:root{color-scheme:light;--paper:#f8f2e6;--ink:#24201c;--accent:#963520;--line:#d9cdbc;--muted:#5d5147;--panel:#2c2320}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 system-ui,"PingFang SC","Microsoft YaHei",sans-serif}
a{color:var(--accent);text-underline-offset:4px}a:focus-visible{outline:3px solid var(--accent);outline-offset:5px}.shell{width:min(1120px,calc(100% - 48px));margin-inline:auto}
.bar{border-bottom:1px solid var(--line)}.top,.footer{display:flex;justify-content:space-between;align-items:center;gap:16px;padding-block:18px}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;text-decoration:none}.top nav a{font-size:.9rem}
.hero{border-bottom:1px solid var(--line);background:radial-gradient(ellipse at 83% 30%,#f3dfc7,transparent 62%)}.hero-grid{display:grid;grid-template-columns:1.3fr 1fr;align-items:center;gap:clamp(28px,7vw,100px);padding-block:clamp(52px,8vw,112px)}
.index{color:var(--accent);font-size:.8rem;letter-spacing:.13em;font-weight:800;margin:0 0 14px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2.7rem,6.6vw,5.6rem);line-height:1.12;letter-spacing:-.055em;margin-bottom:22px}h1 em{font-style:normal;color:var(--accent)}h2{font-size:clamp(1.6rem,3vw,2.45rem);line-height:1.25}.lede{max-width:34em;color:var(--muted);font-size:1.12rem}.button{display:inline-block;background:var(--accent);color:white;padding:11px 20px;border-radius:5px;text-decoration:none;font-weight:700}
.diagram{background:var(--panel);color:#fff4e8;padding:22px 26px;border-radius:8px;box-shadow:10px 10px 0 #dfc7ae}.diagram div{display:flex;gap:22px;align-items:center;border-bottom:1px solid #64534a;padding:13px 0}.diagram div:last-child{border:0}.diagram .diagram-title{justify-content:space-between;color:#f0c1a3;font-size:.85rem}.diagram b{color:#ffc49e;font-family:monospace}.diagram small{display:block;color:#dec6b6;letter-spacing:.14em;font-size:.65rem}
.guides{padding-block:55px 74px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{display:flex;flex-direction:column;border:1px solid var(--line);border-top:3px solid var(--accent);padding:22px;color:var(--ink);text-decoration:none;background:#fffcf5}.card:hover{border-color:var(--accent);background:#fff}.card h3{font-size:1.15rem;line-height:1.45;margin-bottom:10px}.card p{color:var(--muted)}.more{color:var(--accent);font-weight:700;margin-top:auto}.article{max-width:740px;padding-block:55px 75px}.article .index{margin-top:28px}.article h1{font-size:clamp(2.3rem,5vw,4rem)}.article section{border-top:1px solid var(--line);padding-top:24px;margin-top:25px}.article h2{font-size:1.45rem;margin-bottom:8px}footer{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}
@media(max-width:760px){.hero-grid,.cards{grid-template-columns:1fr}.shell{width:calc(100% - 36px)}.diagram{max-width:440px}.guides{padding-block:42px 55px}}