/* ===== 主题变量（支持日/夜切换） ===== */
:root {
    --primary: #0052ff;
    --primary-light: #eff6ff;
    --primary-deep: #003db3;
    --dark: #09090b;
    --text-main: #27272a;
    --text-muted: #66666e; /* 白底上 ≈5.7:1，达 WCAG AA（原 #71717a 仅 ≈4.8:1） */
    --bg-white: #ffffff;
    --bg-gray: #f8fafc;
    --bg-site: #f8fafc;
    --card-bg: #ffffff;
    --brand: #2563eb;
    --brand-hover: #1d4ed8;
    --brand-light: #eff6ff;
    --border: #e2e8f0;
    --radius-full: 99px;
    --radius-lg: 24px;
    --radius-md: 16px;
    --transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
    --glass-bg: rgba(255,255,255,0.7);
    --glass-border: rgba(0,0,0,0.05);
    --toggle-bg: #e2e8f0;
    --toggle-dot: #ffffff;
}

[data-theme="dark"] {
    --primary: #5a8aff;
    --primary-light: #2a1a3a;
    --primary-deep: #7a9aff;
    --dark: #f0e8df;
    --text-main: #d0c4b8;
    --text-muted: #948472; /* 暖灰提亮：卡片底 #1a1512 上 ≈5.0:1，达 WCAG AA（原 #8a7a6a 仅 ≈4.4:1） */
    --bg-white: #0d0a08;
    --bg-gray: #14100e;
    --bg-site: #0d0a08;
    --card-bg: #1a1512;
    --brand: #5a8aff;
    --brand-hover: #7a9aff;
    --brand-light: #2a1a3a;
    --border: #3a2e28;
    --shadow-hover: 0 16px 48px rgba(0,0,0,0.70);
    --shadow: 0 8px 32px rgba(0,0,0,0.55);
    --glass-bg: rgba(13,10,8,0.85);
    --glass-border: rgba(255,255,255,0.06);
    --toggle-bg: #1a1512;
    --toggle-dot: #f0e8df;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    padding-top: 80px;
    font-family: -apple-system, "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text-main);
    background: var(--bg-white);
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; width: 100%; }