:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text: #ffffff;
    --text-muted: #aaaaaa;
    --primary: #8b5cf6;
    --border: #333333;
}

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

body {
    font-family: 'Manrope', sans-serif;
    background-color: var(--bg-color);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 1000px;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.highlight {
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
    font-size: 0.9rem;
}

.noise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.noise-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 1.5rem;
    padding: 2rem;
    text-align: center;
    transition: transform 0.2s, border-color 0.2s;
    position: relative;
    overflow: hidden;
}

.noise-card:hover,
.noise-card:focus-within {
    transform: translateY(-5px);
    border-color: var(--primary);
    outline: none;
}

.noise-card.playing {
    border-color: var(--primary);
    box-shadow: 0 0 30px rgba(139, 92, 246, 0.1);
}

.icon-wrapper {
    position: relative;
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.icon {
    font-size: 3rem;
    z-index: 2;
}

.visualizer-ring {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 2px solid var(--primary);
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.3s;
}

.playing .visualizer-ring {
    opacity: 1;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(0.8);
        opacity: 0.5;
    }

    50% {
        transform: scale(1.2);
        opacity: 0.2;
    }

    100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 2rem;
    min-height: 3em;
}

.play-btn {
    background: white;
    color: black;
    border: none;
    padding: 0.75rem 2.5rem;
    border-radius: 2rem;
    font-weight: 700;
    cursor: pointer;
    margin-bottom: 1.5rem;
    transition: transform 0.1s;
}

.play-btn:hover,
.play-btn:focus {
    transform: scale(1.05);
    outline: none;
}

.playing .play-btn {
    background: var(--primary);
    color: white;
}

.volume-slider {
    width: 100%;
    accent-color: var(--primary);
    cursor: pointer;
}

.master-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
}

.timer-control {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-muted);
}

select {
    background: var(--card-bg);
    color: white;
    border: 1px solid var(--border);
    padding: 0.5rem;
    border-radius: 0.5rem;
    outline: none;
}

.secondary-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

.secondary-btn:hover,
.secondary-btn:focus {
    border-color: white;
    color: white;
    outline: none;
}