:root{--brand: #0d6efd;--text: #1f2937;--muted: #6b7280;--heading: #111827;--link: var(--brand);--border: #e5e7eb;--bg: #ffffff;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC","Hiragino Sans GB","Microsoft YaHei", "Noto Sans SC","Helvetica Neue", Arial, sans-serif;--w-regular: 400;--w-medium: 500;--w-semibold: 600;--w-bold: 700;--lh-body: 1.75;--lh-heading: 1.25;--fs-xs: clamp(12px, 2.2vw, 12px);--fs-sm: clamp(14px, 2.2vw, 14px);--fs-base: clamp(15px, 2.3vw, 16px);--fs-lg: clamp(16px, 2.6vw, 18px);--fs-xl: clamp(18px, 3.2vw, 22px);--fs-2xl: clamp(22px, 4vw, 28px);--fs-3xl: clamp(26px, 5vw, 34px);--radius: 14px;--shadow: 0 8px 24px rgba(0,0,0,.06);--shadow-lg: 0 14px 32px rgba(0,0,0,.12);--space-section: 64px;--space-section-lg: 96px;--gap: 20px;--section-alt-bg: #f7f9fc;--section-hero-from: #f3f8ff;--section-hero-to: 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