:root{--bg: #F8FAFC;--surface: #FFFFFF;--ink: #0A0D12;--text: #2C343D;--muted: #68727D;--line: #DDE4EB;--ice: #69C9FF;--cobalt: #6286FF;--violet: #C994FF;--cyan: #5DE2D4;--radius: 8px;--radius-sm: 4px;--radius-lg: 12px;--shadow: 0 1px 0 rgba(10, 13, 18, .04);--container: 1280px;--container-narrow: 760px;--header-h: 72px;--gutter: 24px;--fz-eyebrow: 12px;--fz-h1: clamp(36px, 5vw, 68px);--fz-h2: clamp(28px, 3vw, 44px);--fz-h3: clamp(20px, 2vw, 24px);--fz-body: 17px;--fz-small: 14px;--font-zh: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;--font-en: "Inter", -apple-system, "Segoe UI", sans-serif;--font-mono: "JetBrains Mono", ui-monospace, Menlo, monospace;--ease: cubic-bezier(.16, 1, .3, 1);--dur: .24s}@layer 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