:root{--red:#8c1d22;--red2:#b02a30;--ink:#201b19;--muted:#726964;--paper:#fbf8f2;--warm:#f3ede3;--line:#e2d9ce;--white:#fff;--shadow:0 18px 50px rgba(73,42,31,.10)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:#fff;line-height:1.6}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.container{width:min(1180px,calc(100% - 40px));margin:auto}.narrow{max-width:820px}.site-header{height:76px;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50;backdrop-filter:blur(12px)}.nav-wrap{height:100%;display:flex;align-items:center;gap:38px}.brand{display:flex;align-items:center;gap:11px;min-width:max-content}.brand strong{font-size:20px;letter-spacing:.08em}.brand small{display:block;font-size:10px;color:var(--muted);letter-spacing:.12em}.brand-seal{width:43px;height:43px;border:2px solid 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