:root{--primary: #0f4c5c;--primary-dark: #082f3a;--accent: #c97b3f;--accent-soft: #f1dfd0;--cream: #f7f5f0;--paper: #fff;--ink: #172126;--muted: #667177;--line: rgba(15, 76, 92, .13);--shadow: 0 24px 70px rgba(13, 54, 65, .11);--font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--cream);font-family:var(--font);line-height:1.7;-webkit-font-smoothing:antialiased}button,input{font:inherit}a{color:inherit}.top-line{height:3px;background:linear-gradient(90deg,var(--primary),var(--accent))}.product-nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(18px)}.nav-inner{height:72px;max-width:1280px;margin:auto;padding:0 32px;display:flex;align-items:center;gap:34px}.brand{display:inline-flex;margin-right:auto}.brand img{width:auto;height:42px;display:block}.nav-inner 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