/* === Reset === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #ffffff;
    --bg-btn: #0a0a0a;
    --text: #0a0a0a;
    --text-2: #1a1a1a;
    --text-3: #2a2a2a;
    --border: #1a1a1a;
    --border-strong: #0a0a0a;
    --font: 'Inter', -apple-system, sans-serif;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 14px;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 4rem 1.5rem;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 540px;
}

/* === Header === */
.header {
    text-align: center;
    margin-bottom: 3rem;
}

.header h1 {
    font-size: 1.65rem;
    font-weight: 300;
    letter-spacing: 0.45em;
    text-transform: uppercase;
    color: var(--text);
}

.tagline {
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.08em;
    color: var(--text-3);
    margin-top: 0.5rem;
}

/* === Ficha === */
.ficha {
    border: 1px solid var(--border);
    padding: 2rem;
    margin-bottom: 1px;
    transition: border-color 0.6s ease;
}

.ficha.active {
    border-color: var(--border-strong);
}

/* Estado */
.ficha-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.8rem;
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-3);
}

.dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--border);
    transition: background 0.3s;
}

.dot.connected {
    background: var(--text);
    animation: pulse 2.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.15; }
}

/* Pista */
.ficha-track {
    display: flex;
    align-items: baseline;
    gap: 1.2rem;
    margin-bottom: 1.8rem;
}

.track-number {
    font-size: 2.8rem;
    font-weight: 200;
    color: var(--border);
    line-height: 1;
    min-width: 2.4rem;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.track-info {
    flex: 1;
}

.track-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.4;
    word-break: break-word;
}

.track-artist {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--text-2);
    margin-top: 0.15rem;
    word-break: break-word;
}

/* Disco */
.ficha-disc {
    padding-top: 1.2rem;
    border-top: none;
}

.disc-row {
    display: flex;
    gap: 1rem;
    padding: 0.35rem 0;
    font-size: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.disc-row-last {
    border-bottom: none;
}

.disc-label {
    color: var(--text-3);
    min-width: 3.5rem;
    flex-shrink: 0;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.65rem;
    padding-top: 0.1rem;
}

.disc-value {
    color: var(--text-2);
    word-break: break-word;
}

.disc-value a {
    color: var(--text);
    text-decoration: none;
    border-bottom: 1px solid var(--border);
    transition: border-color 0.2s;
}

.disc-value a:hover {
    border-color: var(--text);
}

/* === Player === */
.player {
    border: 1px solid var(--border);
    border-bottom: none;
    padding: 1.4rem 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-play {
    background: var(--bg-btn);
    color: var(--bg);
    border: none;
    padding: 0.65rem 1.8rem;
    font-family: var(--font);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-play:hover {
    background: #333333;
}

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

.btn-toggle {
    background: none;
    border: 1px solid var(--border);
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text);
    transition: all 0.2s;
}

.btn-toggle:hover {
    background: var(--text);
    color: var(--bg);
    border-color: var(--text);
}

.btn-toggle svg {
    display: block;
}

.volume-wrap {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.vol-icon {
    color: var(--text-3);
    display: flex;
    align-items: center;
}

.vol-icon svg {
    display: block;
}

.vol-slider {
    width: 64px;
    height: 2px;
    accent-color: var(--text);
    cursor: pointer;
}

.time-display {
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--text-3);
    margin-left: auto;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.05em;
}

/* === Utilidades === */
.hidden {
    display: none !important;
}

/* === Responsive === */
@media (max-width: 480px) {
    body {
        padding: 2rem 1rem;
    }

    .ficha {
        padding: 1.5rem;
    }

    .track-number {
        font-size: 2rem;
        min-width: 1.8rem;
    }

    .player {
        padding: 1.2rem 1.5rem;
        flex-direction: column;
        align-items: stretch;
    }

    .player-controls {
        justify-content: center;
    }

    .time-display {
        margin-left: 0;
    }
}