:root {
    --font-main: 'Noto Sans SC', 'Segoe UI', Arial, sans-serif;
    --bg-gradient: linear-gradient(140deg, #e0f5e9 0%, #c6f0e0 35%, #a3e4d7 100%);
    --bg-gradient-next: var(--bg-gradient);
    --container-bg: rgba(255, 255, 255, 0.6);
    --container-shadow: rgba(0, 0, 0, 0.1);
    --backdrop-blur: 12px;
    --text-color: #2c3e50;
    --text-secondary-color: #7f8c8d;
    --primary-color: #1abc9c;
    --primary-color-dark: #12836d;
    --warning-color: #e74c3c;
    --success-color: #2ecc71;
    --success-color-hover: #27ae60;
    --item-hover-bg: rgba(26, 188, 156, 0.1);
    --item-current-bg: rgba(26, 188, 156, 0.2);
    --item-current-text: var(--primary-color);
    --border-color: rgba(0, 0, 0, 0.1);
    --lyrics-highlight-bg: rgba(46, 204, 113, 0.12);
    --lyrics-highlight-text: #1e9f78;
    --lyrics-highlight-shadow: rgba(46, 204, 113, 0.18);
    --component-bg: rgba(255, 255, 255, 0.5);
    --scrollbar-thumb-bg: rgba(0, 0, 0, 0.2);
    --scrollbar-track-bg: transparent;

    /* 3D Cover + Reflection */
    --cover-perspective: 1200px;
    --cover-rotate: 0deg;
    --cover-tilt-x: 2deg;
    --reflection-opacity: 0.25;
    --reflection-height: 80px;
    --reflection-width: 200px;
    --reflection-source-height: 200px;
    --glow-color: rgba(26, 188, 156, 0.25);
    --glow-color-mid: rgba(26, 188, 156, 0.1);
    --glow-blur: 40px;
    --glow-opacity: 0.6;
}

.dark-mode {
    --bg-gradient: linear-gradient(135deg, #0b1d1b 0%, #0f2f2c 45%, #123c36 100%);
    --container-bg: rgba(30, 30, 30, 0.6);
    --container-shadow: rgba(0, 0, 0, 0.3);
    --text-color: #ecf0f1;
    --text-secondary-color: #95a5a6;
    --primary-color: #1abc9c;
    --primary-color-dark: #17a589;
    --item-hover-bg: rgba(26, 188, 156, 0.1);
    --item-current-bg: rgba(26, 188, 156, 0.2);
    --border-color: rgba(255, 255, 255, 0.15);
    --lyrics-highlight-bg: rgba(26, 188, 156, 0.12);
    --lyrics-highlight-text: #34d1b6;
    --component-bg: rgba(44, 44, 44, 0.5);
    --scrollbar-thumb-bg: rgba(255, 255, 255, 0.2);
    --success-color-hover: #1f8a4f;

    /* Dark mode glow intensified */
    --glow-color: rgba(26, 188, 156, 0.35);
    --glow-color-mid: rgba(26, 188, 156, 0.15);
    --glow-opacity: 0.75;
    --reflection-opacity: 0.2;
}

body {
    font-family: var(--font-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100dvh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
    color: var(--text-color);
    transition: color 0.5s;
    background-color: #0f0f0f;
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb-bg);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}