/* ==========================================================================
   ChordStar × AI Stem Studio: Karaoke Mode & Multitrack Mixer Styles
   ========================================================================== */

.cs-km-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 999999;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 15, 29, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.cs-km-modal.active {
    opacity: 1;
    pointer-events: auto;
}

.cs-km-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.cs-km-dialog {
    position: relative;
    width: 92%;
    max-width: 820px;
    background: #111827;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6), 0 0 40px rgba(6, 182, 212, 0.15);
    padding: 24px;
    color: #f8fafc;
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-height: 90vh;
    overflow-y: auto;
    z-index: 10;
}

/* Header */
.cs-km-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 16px;
}

.cs-km-badge {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: #06b6d4;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.cs-km-song-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 0;
    color: #ffffff;
    line-height: 1.2;
}

.cs-km-song-artist {
    font-size: 0.95rem;
    color: #94a3b8;
    margin: 4px 0 0 0;
}

.cs-km-header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.cs-km-status-pill {
    font-size: 0.75rem;
    background: rgba(6, 182, 212, 0.15);
    color: #38bdf8;
    border: 1px solid rgba(56, 189, 248, 0.25);
    padding: 4px 10px;
    border-radius: 9999px;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.cs-km-status-pill.online {
    background: rgba(16, 185, 129, 0.15);
    color: #34d399;
    border-color: rgba(52, 211, 153, 0.35);
}

.cs-km-status-pill.offline {
    background: rgba(244, 63, 94, 0.15);
    color: #fb7185;
    border-color: rgba(251, 113, 133, 0.35);
}

.cs-km-status-pill.checking {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
    border-color: rgba(251, 191, 36, 0.35);
}

.cs-km-status-pill.processing {
    background: rgba(168, 85, 247, 0.15);
    color: #c084fc;
    border-color: rgba(192, 132, 252, 0.35);
}

/* Offline Card View */
.cs-km-offline-view {
    text-align: center;
    padding: 28px 16px;
    max-width: 520px;
    margin: 0 auto;
}

.cs-km-offline-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.cs-km-offline-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: #ffffff;
    margin: 0 0 10px 0;
}

.cs-km-offline-desc {
    font-size: 0.92rem;
    color: #94a3b8;
    line-height: 1.6;
    margin: 0 0 24px 0;
}

.cs-km-offline-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.cs-km-close-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #94a3b8;
    font-size: 1.2rem;
    width: 34px;
    height: 34px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.cs-km-close-btn:hover {
    background: rgba(239, 68, 68, 0.2);
    color: #f87171;
    border-color: rgba(239, 68, 68, 0.4);
}

/* Loading Box */
.cs-km-loading-box {
    text-align: center;
    padding: 40px 20px;
}

.cs-km-spinner {
    width: 44px;
    height: 44px;
    border: 3px solid rgba(6, 182, 212, 0.2);
    border-top-color: #06b6d4;
    border-radius: 50%;
    margin: 0 auto 16px auto;
    animation: cs-km-spin 0.8s linear infinite;
}

@keyframes cs-km-spin {
    to { transform: rotate(360deg); }
}

.cs-km-loading-text {
    font-size: 0.95rem;
    color: #94a3b8;
}

/* Transport Bar */
.cs-km-transport {
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.cs-km-transport-left {
    display: flex;
    align-items: center;
    gap: 14px;
    flex: 1;
    min-width: 260px;
}

.cs-km-play-btn {
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    color: #ffffff;
    border: none;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 9px 18px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: transform 0.15s, filter 0.2s;
    min-width: 96px;
    justify-content: center;
}

.cs-km-play-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.cs-km-play-btn.playing {
    background: linear-gradient(135deg, #f59e0b, #d97706);
}

.cs-km-timeline-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
}

.cs-km-time {
    font-size: 0.8rem;
    font-variant-numeric: tabular-nums;
    color: #94a3b8;
    min-width: 34px;
}

.cs-km-seek-slider {
    flex: 1;
    accent-color: #06b6d4;
    cursor: pointer;
    height: 6px;
}

.cs-km-transport-right {
    display: flex;
    align-items: center;
    gap: 14px;
}

.cs-km-master-vol-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
}

.cs-km-vol-slider {
    width: 80px;
    accent-color: #06b6d4;
    cursor: pointer;
}

.cs-km-reset-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: #cbd5e1;
    font-size: 0.8rem;
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.cs-km-reset-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
}

/* Presets */
.cs-km-presets-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    padding: 4px 0;
}

.cs-km-presets-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-right: 4px;
}

.cs-km-preset-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #cbd5e1;
    font-size: 0.8rem;
    padding: 6px 12px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.cs-km-preset-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.cs-km-preset-btn.active {
    background: rgba(6, 182, 212, 0.2);
    border-color: #06b6d4;
    color: #38bdf8;
    font-weight: 600;
}

/* Strips Grid */
.cs-km-strips-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-top: 6px;
}

@media (max-width: 680px) {
    .cs-km-strips-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.cs-km-strip {
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    transition: opacity 0.2s, border-color 0.2s;
}

.cs-km-strip.dimmed {
    opacity: 0.45;
}

.cs-km-strip-header {
    display: flex;
    align-items: center;
    gap: 6px;
    width: 100%;
    justify-content: center;
}

.cs-km-strip-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.cs-km-strip-icon {
    font-size: 1.1rem;
}

.cs-km-strip-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: #ffffff;
}

.cs-km-strip-controls {
    display: flex;
    gap: 8px;
    width: 100%;
}

.cs-km-btn.sm {
    flex: 1;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 6px 0;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.05);
    color: #94a3b8;
    cursor: pointer;
    transition: all 0.15s;
    text-align: center;
}

.cs-km-btn.sm:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #f1f5f9;
}

.cs-km-btn.sm.mute-active {
    background: #ef4444 !important;
    border-color: #dc2626 !important;
    color: #ffffff !important;
}

.cs-km-btn.sm.solo-active {
    background: #f59e0b !important;
    border-color: #d97706 !important;
    color: #111827 !important;
}

.cs-km-fader-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding-top: 6px;
}

.cs-km-fader {
    width: 100%;
    accent-color: #06b6d4;
    cursor: pointer;
}

.cs-km-fader-val {
    font-size: 0.8rem;
    font-variant-numeric: tabular-nums;
    color: #cbd5e1;
}