:root{--ink:#151515;--iron:#242424;--brick:#8b3f2f;--rust:#b35a35;--wood:#7c5638;--metal:#8b9294;--cement:#b7afa4;--paper:#eee4d4;--gold:#c0a164;--shadow:rgba(0,0,0,.45)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"Microsoft YaHei",Arial,sans-serif;background:#171717;color:var(--paper);line-height:1.75;background-image:radial-gradient(circle at 18% 8%,rgba(179,90,53,.2),transparent 32%),linear-gradient(135deg,#121212,#2b2926 48%,#171717)}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}header{position:sticky;top:0;z-index:50;background:rgba(18,18,18,.94);backdrop-filter:blur(12px);border-bottom:1px solid rgba(192,161,100,.28)}.nav{max-width:1220px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:14px 18px;gap:18px}.logo{display:flex;align-items:center;gap:10px;font-weight:900;letter-spacing:2px;font-size:22px;text-transform:uppercase}.logo-mark{width:40px;height:40px;border:2px solid 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