:root {
    --primary: #6C63FF;
    --secondary: #A78BFA;
    --accent: #22D3EE;
    --bg-dark: #0F0A1A;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.07);
    --bg-card-active: rgba(108, 99, 255, 0.15);
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --border: rgba(255, 255, 255, 0.08);
    --radius: 16px;
    --font-sans: 'Inter', system-ui, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Ambient animated background */
.ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 15% 50%, rgba(108, 99, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(34, 211, 238, 0.05) 0%, transparent 50%);
    z-index: -2;
    pointer-events: none;
}

#visualizer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    opacity: 0.4;
}

.app-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    letter-spacing: -0.5px;
}

.logo svg {
    width: 32px;
    height: 32px;
}

.controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.icon-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
}

.icon-btn:hover {
    background: var(--bg-card-hover);
    color: white;
}

.icon-btn.active {
    background: var(--bg-card-active);
    color: var(--accent);
    border-color: var(--primary);
}

.w-5 {
    width: 20px;
}

.h-5 {
    height: 20px;
}

/* Tooltip */
.tooltip {
    position: relative;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    top: 110%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
    border-radius: 6px;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 10;
}

.tooltip:hover::after {
    opacity: 1;
}

/* Timer Dropdown */
.timer-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.timer-display {
    font-variant-numeric: tabular-nums;
    font-weight: 600;
    color: var(--accent);
    background: rgba(34, 211, 238, 0.1);
    padding: 0.4rem 0.75rem;
    border-radius: 8px;
    font-size: 0.9rem;
}

.dropdown {
    position: absolute;
    top: 110%;
    right: 0;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    z-index: 20;
    min-width: 120px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
}

.dropdown.hidden,
.hidden {
    display: none !important;
}

.timer-opt {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    text-align: left;
    cursor: pointer;
    border-radius: 6px;
    font-family: var(--font-sans);
}

.timer-opt:hover {
    background: var(--bg-card);
    color: white;
}

/* Master Controls */
.master-control {
    display: flex;
    align-items: center;
    gap: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 1.5rem 2rem;
    border-radius: var(--radius);
    backdrop-filter: blur(12px);
    margin-bottom: 2rem;
}

.master-play {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), #8B5CF6);
    border: none;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 8px 20px rgba(108, 99, 255, 0.4);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.master-play:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(108, 99, 255, 0.6);
}

.master-play:active {
    transform: scale(0.95);
}

.master-play svg {
    width: 28px;
    height: 28px;
}

.master-slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-grow: 1;
    color: var(--text-muted);
}

.master-slider-container svg {
    width: 24px;
    height: 24px;
}

/* Sliders */
.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    transition: transform 0.1s;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.master-slider-container .slider::-webkit-slider-thumb {
    width: 20px;
    height: 20px;
    background: var(--accent);
}

/* Presets */
.presets-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.preset-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.preset-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.5rem 1.25rem;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.preset-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.preset-btn.outline {
    background: transparent;
    border-color: var(--primary);
    color: var(--primary);
}

.preset-btn.outline:hover {
    background: rgba(108, 99, 255, 0.1);
}

/* Sound Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
    padding-bottom: 4rem;
}

.sound-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(8px);
    position: relative;
    overflow: hidden;
}

.sound-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary);
    opacity: 0;
    transition: opacity 0.3s;
    z-index: -1;
}

.sound-card.active {
    border-color: var(--primary);
}

.sound-card.active::before {
    opacity: 0.05;
}

.sound-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: var(--secondary);
    transition: all 0.3s;
    cursor: pointer;
}

.sound-card.active .sound-icon {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 15px rgba(108, 99, 255, 0.4);
}

.sound-icon svg {
    width: 24px;
    height: 24px;
}

.sound-name {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.volume-wrapper {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.volume-wrapper svg {
    width: 14px;
    height: 14px;
    color: var(--text-muted);
}

.sound-shortcut {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 0.65rem;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 6px;
    border-radius: 4px;
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 1.5rem;
    }

    .master-control {
        flex-direction: column;
        padding: 1.5rem;
    }

    .grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .sound-card {
        padding: 1rem;
    }
}