.hidden {
    display: none !important;
}

/* Setup Cards */
.setup-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 70vh;
    padding: 1rem;
}

.setup-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    text-align: center;
}

    .setup-card h2 {
        margin-top: 0;
        color: var(--text-main);
    }

    .setup-card p {
        color: var(--text-muted);
        margin-bottom: 1.5rem;
    }

.input-group {
    text-align: left;
    margin-bottom: 1.2rem;
}

    .input-group label {
        display: block;
        margin-bottom: 0.5rem;
        font-size: 0.9rem;
        color: var(--text-muted);
    }

    .input-group input, .input-group select {
        width: 100%;
        padding: 0.75rem;
        background: var(--bg-base);
        border: 1px solid var(--border-color);
        color: var(--text-main);
        border-radius: 8px;
        font-size: 1rem;
        box-sizing: border-box;
    }

.btn-primary {
    width: 100%;
    padding: 0.75rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.2s;
}

    .btn-primary:hover {
        filter: brightness(1.1);
    }

/* Main App */
.main-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 1rem;
}

.event-header {
    text-align: center;
    margin-bottom: 2rem;
}

    .event-header h1 {
        margin: 0 0 0.5rem 0;
        font-size: 2rem;
    }

/* Timeline Grid */
.timeline-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    overflow-x: auto;
}

.timeline-axis {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem; /* extra room for tooltips */
    position: relative;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.axis-labels {
    position: relative;
    height: 20px;
}

.axis-tick {
    position: absolute;
    transform: translateX(-50%);
    font-size: 0.7rem;
    color: var(--text-muted);
    white-space: nowrap;
    text-align: center;
}

    .axis-tick::after {
        content: '';
        position: absolute;
        bottom: -10px;
        left: 50%;
        width: 1px;
        height: 8px;
        background: var(--border-color);
    }

    .axis-tick.tick-minor::after {
        height: 4px;
        bottom: -6px;
    }

.timeline-tracks {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.track-row {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 1rem;
    align-items: center;
    margin-top: 0.5rem;
}

.track-user-info {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.track-name {
    font-weight: bold;
    font-size: 0.95rem;
}

.track-tz {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Custom Range Slider */
.slider-container {
    position: relative;
    height: 30px;
    width: 100%;
    display: flex;
    align-items: center;
}

.slider-bg {
    position: absolute;
    left: 0;
    right: 0;
    height: 8px;
    background: var(--bg-base);
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.slider-range {
    position: absolute;
    height: 8px;
    border-radius: 4px;
    opacity: 0.8;
}

.slider-thumb {
    position: absolute;
    width: 20px;
    height: 20px;
    background: #fff;
    border-radius: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    cursor: pointer;
    z-index: 2;
    transition: transform 0.1s;
}

    .slider-thumb:hover, .slider-thumb.active {
        transform: translate(-50%, -50%) scale(1.2);
        z-index: 10;
    }

.slider-container.readonly .slider-thumb {
    display: none;
}

/* Tooltips */
.slider-tooltip {
    position: absolute;
    bottom: 140%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-base);
    color: var(--text-main);
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: bold;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

.slider-container:not(.readonly):hover .slider-tooltip,
.slider-thumb.active .slider-tooltip {
    opacity: 1;
}

/* Summary */
.summary-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
}

    .summary-card h3 {
        margin-top: 0;
        color: var(--text-muted);
    }

.overlap-result {
    font-size: 1.25rem;
    font-weight: bold;
    padding: 1rem;
    border-radius: 8px;
    background: var(--bg-base);
    white-space: pre-wrap;
}

.overlap-success {
    color: #10b981;
    border: 1px solid #10b981;
}

.overlap-fail {
    color: #ef4444;
    border: 1px solid #ef4444;
}

@media (max-width: 600px) {
    .timeline-axis, .track-row {
        grid-template-columns: 80px 1fr;
        gap: 0.5rem;
    }

    .track-name {
        font-size: 0.85rem;
    }
}