:root{--paper:#f7f5ef;--panel:#fffdf8;--ink:#293c34;--muted:#69766c;--line:#dcded2;--accent:#355c48;--wash:#eaf0e4;--serif:'Songti SC','STSong','Noto Serif CJK SC',serif;--sans:'PingFang SC','Microsoft YaHei',sans-serif}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:radial-gradient(ellipse at 90% 0%,#e9eddd 0,transparent 45%),var(--paper);font-family:var(--sans);line-height:1.7}.shell{max-width:1120px;margin:auto;padding:0 max(22px,env(safe-area-inset-right)) 28px max(22px,env(safe-area-inset-left))}.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 0;border-bottom:1px solid var(--line)}.nav a{display:inline-flex;align-items:center;min-height:44px;color:inherit;text-decoration:none;font-size:13px}.nav a:first-child{font-size:21px;letter-spacing:-.05em;font-weight:600}.nav a:hover{text-decoration:underline}.hero{padding:48px 0 30px;max-width:800px}.eyebrow{font-size:11px;letter-spacing:.15em;color:var(--muted);margin:0 0 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