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

:root {
    --primary-bg: #0f0f0f;
    --secondary-bg: #1a1a1a;
    --tertiary-bg: #252525;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --border: #333333;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    min-height: 100vh;
}

.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    padding: 2rem 1.5rem 1.5rem;
    text-align: center;
    border-bottom: 1px solid var(--border);
    background-color: var(--secondary-bg);
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

main {
    flex: 1;
    padding: 2rem 1.5rem;
    overflow-y: auto;
}

.sounds-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 1rem;
    justify-items: center;
}

.sound-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    max-width: 120px;
    aspect-ratio: 1;
    padding: 1rem;
    background-color: var(--tertiary-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.sound-button:active {
    background-color: var(--accent);
    border-color: var(--accent);
    transform: scale(0.95);
}

.sound-button:hover {
    background-color: var(--accent);
    border-color: var(--accent);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
}

.sound-button .icon {
    font-size: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sound-button .label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    word-break: break-word;
    line-height: 1.2;
    max-width: 100%;
}

.loading {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
    font-size: 1rem;
}

.error {
    grid-column: 1 / -1;
    text-align: center;
    color: #ef4444;
    padding: 2rem;
    font-size: 1rem;
}

/* Responsive Design */
@media (max-width: 480px) {
    header {
        padding: 1.5rem 1rem 1rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    main {
        padding: 1.5rem 1rem;
    }

    .sounds-grid {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
        gap: 0.75rem;
    }

    .sound-button {
        max-width: 100%;
        gap: 0.5rem;
    }

    .sound-button .icon {
        font-size: 2rem;
    }

    .sound-button .label {
        font-size: 0.7rem;
    }
}

@media (max-width: 360px) {
    .sounds-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }

    .sound-button .icon {
        font-size: 1.75rem;
    }
}

/* Tablet and larger */
@media (min-width: 768px) {
    main {
        padding: 3rem 2rem;
    }

    .sounds-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 1.5rem;
        max-width: 1200px;
        margin: 0 auto;
    }

    .sound-button {
        max-width: 140px;
        gap: 1rem;
        padding: 1.5rem 1rem;
    }

    .sound-button .icon {
        font-size: 3rem;
    }

    .sound-button .label {
        font-size: 0.85rem;
    }
}