:root {
            --water-deep: #0a2e38;
            --water-dark: #0f4c5c;
            --water-primary: #1a6b7c;
            --water-mid: #2a93a8;
            --water-light: #5bc0d4;
            --water-glow: #8ed7e6;
            --gold-dark: #8b6914;
            --gold-primary: #c9a227;
            --gold-mid: #dbb84a;
            --gold-light: #f0d878;
            --gold-glow: #ffe89a;
            --ink-black: #1a2332;
            --ink-dark: #2d3e50;
            --ink-mid: #4a6274;
            --ink-light: #6b8299;
            --paper-cream: #faf7f0;
            --paper-warm: #f5f0e6;
            --paper-cool: #f0f4f7;
            --surface-white: #ffffff;
            --glass-water: rgba(10, 46, 56, 0.08);
            --glass-gold: rgba(201, 162, 39, 0.12);
            --shadow-water: rgba(15, 76, 92, 0.18);
            --shadow-gold: rgba(201, 162, 39, 0.25);

            --shadow-xs: 0 1px 3px rgba(15, 76, 92, 0.06);
            --shadow-sm: 0 3px 8px rgba(15, 76, 92, 0.08), 0 1px 4px rgba(15, 76, 92, 0.05);
            --shadow-md: 0 10px 28px rgba(15, 76, 92, 0.12), 0 4px 12px rgba(15, 76, 92, 0.08);
            --shadow-lg: 0 24px 56px rgba(15, 76, 92, 0.18), 0 8px 24px rgba(15, 76, 92, 0.12);
            --shadow-xl: 0 40px 80px rgba(15, 76, 92, 0.24), 0 12px 36px rgba(15, 76, 92, 0.16);
            --shadow-gold-sm: 0 4px 16px rgba(201, 162, 39, 0.2);
            --shadow-gold-md: 0 8px 28px rgba(201, 162, 39, 0.3);

            --radius-xs: 6px;
            --radius-sm: 10px;
            --radius: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;

            --font-display: 'Noto Serif SC', 'PingFang SC', 'Microsoft YaHei', serif;
            --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

            --gradient-water-deep: linear-gradient(135deg, #0a2e38 0%, #0f4c5c 50%, #1a6b7c 100%);
            --gradient-water: linear-gradient(135deg, #0f4c5c 0%, #1a6b7c 40%, #2a93a8 100%);
            --gradient-water-light: linear-gradient(135deg, #1a6b7c 0%, #2a93a8 50%, #5bc0d4 100%);
            --gradient-gold: linear-gradient(135deg, #8b6914 0%, #c9a227 50%, #dbb84a 100%);
            --gradient-gold-light: linear-gradient(135deg, #c9a227 0%, #dbb84a 50%, #f0d878 100%);
            --gradient-paper: linear-gradient(180deg, #faf7f0 0%, #f5f0e6 100%);
            --gradient-sky: linear-gradient(180deg, #e8f4f8 0%, #d0e8ef 50%, #b8dbe5 100%);

            --ease-smooth: cubic-bezier(0.22, 1, 0.36, 1);
            --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
            --ease-water: cubic-bezier(0.25, 0.8, 0.25, 1);

            --transition-fast: all 0.2s var(--ease-smooth);
            --transition-base: all 0.35s var(--ease-smooth);
            --transition-slow: all 0.5s var(--ease-smooth);
            --transition-bounce: all 0.5s var(--ease-bounce);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }

        html, body {
            height: auto;
            min-height: 100%;
            -webkit-overflow-scrolling: touch;
            overflow-x: hidden;
        }

        body {
            font-family: var(--font-body);
            background: var(--paper-cool);
            color: var(--ink-black);
            font-size: 14px;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            letter-spacing: 0.02em;
            position: relative;
        }

        body::before {
            content: "";
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 50vh;
            background:
                radial-gradient(ellipse 80% 50% at 20% 0%, rgba(42, 147, 168, 0.08) 0%, transparent 70%),
                radial-gradient(ellipse 60% 40% at 80% 10%, rgba(201, 162, 39, 0.06) 0%, transparent 60%);
            pointer-events: none;
            z-index: 0;
        }

        ::-webkit-scrollbar { width: 8px; height: 8px; }
        ::-webkit-scrollbar-track { background: transparent; }
        ::-webkit-scrollbar-thumb {
            background: linear-gradient(180deg, var(--water-light), var(--water-mid));
            border-radius: 10px;
            border: 2px solid transparent;
            background-clip: padding-box;
            opacity: 0.7;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: linear-gradient(180deg, var(--water-mid), var(--water-primary));
            background-clip: padding-box;
            opacity: 1;
        }

        .sidebar::-webkit-scrollbar-thumb { border-color: var(--paper-warm); }
        .modal-content::-webkit-scrollbar-thumb { border-color: var(--surface-white); }