:root{--primary:#2563eb;--primary-dark:#4f46e5;--bg-page:#f8fafc;--bg-card:#ffffff;--bg-muted:#f1f5f9;--border-subtle:#e2e8f0;--text-title:#1e293b;--text-body:#64748b;--text-tertiary:#94a3b8;--text-inverse:#ffffff;--card-radius:12px;--radius-sm:12px;--radius-md:12px;--radius-lg:12px;--radius-xl:12px;--shadow-card:0 1px 3px 0 rgba(15,23,42,0.06);--shadow-hover:0 4px 12px rgba(15,23,42,0.10);--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:24px;--space-6:32px;--space-7:48px;--space-8:64px;--font-sans:"STZhongsong","华文中宋","Songti SC","SimSun","宋体","Noto Serif SC",serif}[data-theme=dark]{--bg-page:#0b1220;--bg-card:#111a2e;--bg-muted:#172033;--border-subtle:#1f2a44;--text-title:#e2e8f0;--text-body:#94a3b8;--text-tertiary:#64748b;--text-inverse:#0b1220;--primary:#3b82f6;--primary-dark:#2563eb;--shadow-card:0 1px 3px 0 rgba(0,0,0,0.4);--shadow-hover:0 4px 14px rgba(0,0,0,0.5)}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:var(--font-sans);background:var(--bg-page);color:var(--text-title);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;transition:background-color .2s ease,color .2s ease}a{color:var(--primary);text-decoration:none;transition:color .2s ease,opacity .2s ease}a:hover{color:var(--primary-dark)}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}img{max-width:100%;height:auto;display:block}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}.product-id-badge{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;background:var(--primary);color:var(--text-inverse);border-radius:var(--card-radius);font-weight:700;font-size:18px;letter-spacing:.02em}