/* ============================================================================
   VIDEO COMPARISON TOOL - Page Styles
   ============================================================================

   Browser-based, drag-and-drop video comparison tool: frame-by-frame
   stepping, manual sync offset, and slider-overlay vs side-by-side views.

   Most styles scoped to 'main' to prevent affecting header/footer.
   ============================================================================ */

/* ----------------------------------------------------------------------------
   Main Layout
   ---------------------------------------------------------------------------- */

main {
    padding: 20px;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

main .container {
    max-width: 1200px;
    margin: 0 auto;
}

main header {
    margin-bottom: 30px;
}

main h1 {
    font-size: 2rem;
    margin-bottom: 10px;
    color: var(--color-nav-bg);
}

main .subtitle {
    color: #666;
    font-size: 0.95rem;
}

main .hint {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    margin: 0;
}

/* ----------------------------------------------------------------------------
   Controls Panel - Collapsible upload/config section
   ---------------------------------------------------------------------------- */

.controls {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-top: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.controls-header {
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
    border-bottom: 1px solid var(--color-border);
}

.controls-header:hover {
    background: #f9f9f9;
}

.controls-title {
    font-weight: 600;
    font-size: var(--font-size-base);
    color: var(--color-nav-bg);
}

.controls-toggle {
    font-size: 1.2rem;
    color: #666;
    transition: transform var(--transition-medium);
}

.controls.collapsed .controls-toggle {
    transform: rotate(-90deg);
}

.controls-body {
    padding: 20px;
}

.controls.collapsed .controls-body {
    display: none;
}

.video-config-section {
    margin-bottom: 24px;
}

.video-section-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-nav-bg);
    margin: 0 0 16px 0;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--color-border);
}

.config-divider {
    height: 1px;
    background: var(--color-border);
    margin: 24px 0;
}

.control-group {
    margin-bottom: 16px;
}

.control-group:last-child {
    margin-bottom: 0;
}

.control-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.control-row .control-group {
    flex: 1;
    min-width: 220px;
}

.inline-group {
    display: flex;
    align-items: center;
}

/* ----------------------------------------------------------------------------
   Form Elements - Inputs, checkboxes and buttons
   ---------------------------------------------------------------------------- */

main label {
    display: block;
    margin-bottom: 8px;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

main .checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 0;
    cursor: pointer;
}

main input[type="text"],
main input[type="number"] {
    width: 100%;
    padding: 10px;
    background: #fff;
    border: 1px solid #ccc;
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 0.95rem;
    box-sizing: border-box;
}

main input[type="text"]:focus,
main input[type="number"]:focus {
    outline: none;
    border-color: var(--color-primary);
}

main input[type="checkbox"] {
    width: 16px;
    height: 16px;
}

.offset-input-group {
    display: flex;
    gap: 8px;
    align-items: center;
}

.offset-input-group input[type="number"] {
    flex: 1;
}

main .button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.view-mode-group {
    margin-top: 0;
}

main button {
    padding: 10px 20px;
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background var(--transition-fast);
}

main button:hover {
    background: var(--color-primary-hover);
}

main button:active {
    background: var(--color-primary-active);
}

main button.secondary {
    background: #f0f0f0;
    border: 1px solid #ccc;
    color: var(--color-text-primary);
}

main button.secondary:hover {
    background: #e0e0e0;
}

main button.secondary.small {
    padding: 6px 10px;
    font-size: 0.85rem;
}

main button.mode-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* ----------------------------------------------------------------------------
   Dropzones - Drag & drop / click-to-browse file inputs
   ---------------------------------------------------------------------------- */

.dropzone {
    position: relative;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px 16px;
    text-align: center;
    margin-bottom: 16px;
    background: #fafafa;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.dropzone.dragover {
    border-color: var(--color-primary);
    background: #eef7ff;
}

.dropzone.has-file {
    border-color: var(--color-primary);
    border-style: solid;
}

.dropzone-input {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.dropzone-label {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    word-break: break-all;
}

/* ----------------------------------------------------------------------------
   Comparison Container - Main video comparison area
   ---------------------------------------------------------------------------- */

.comparison-container {
    position: relative;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.comparison-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    background: #111;
    user-select: none;
    -webkit-user-select: none;
}

.comparison-inner {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
}

/* ----------------------------------------------------------------------------
   Status HUD - live settings overlay pinned to the top of the video area,
   so current offset/fps/mode (and the keyboard shortcuts) are always
   visible without scrolling down to the controls panel.
   ---------------------------------------------------------------------------- */

.status-hud {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 5;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    padding: 6px 12px;
    background: rgba(0, 0, 0, 0.65);
    color: #fff;
    font-family: monospace;
    font-size: 0.75rem;
    pointer-events: none;
}

.status-hud.visible {
    display: flex;
}

.status-hud .hud-shortcuts {
    margin-left: auto;
    opacity: 0.75;
}

/* ----------------------------------------------------------------------------
   Slider Overlay Mode
   ---------------------------------------------------------------------------- */

.comparison-inner.mode-slider {
    display: block;
}

.video-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #000;
}

.video-layer video {
    max-width: 100%;
    max-height: 100%;
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.layer-a {
    z-index: 1;
}

.layer-b {
    z-index: 2;
    clip-path: inset(0 0 0 50%);
}

.mode-slider .slider {
    position: absolute;
    top: 0;
    left: 50%;
    width: 4px;
    height: 100%;
    background: var(--color-primary);
    cursor: ew-resize;
    z-index: 3;
    transform: translateX(-50%);
}

.mode-slider .slider-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 48px;
    height: 48px;
    background: #ffffff;
    border: 3px solid var(--color-primary);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.mode-slider .slider-handle::before,
.mode-slider .slider-handle::after {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    border-style: solid;
}

.mode-slider .slider-handle::before {
    left: 8px;
    border-width: 6px 8px 6px 0;
    border-color: transparent var(--color-primary) transparent transparent;
}

.mode-slider .slider-handle::after {
    right: 8px;
    border-width: 6px 0 6px 8px;
    border-color: transparent transparent transparent var(--color-primary);
}

/* ----------------------------------------------------------------------------
   Side-by-Side Mode
   ---------------------------------------------------------------------------- */

.comparison-inner.mode-side-by-side {
    display: flex;
}

.side-pane {
    position: relative;
    flex: 1;
    height: 100%;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.side-pane-a {
    border-right: 2px solid var(--color-primary);
}

.side-pane video {
    max-width: 100%;
    max-height: 100%;
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

/* ----------------------------------------------------------------------------
   Labels - Overlay labels for A/B
   ---------------------------------------------------------------------------- */

.label {
    position: absolute;
    top: 44px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--color-text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    z-index: 4;
    backdrop-filter: blur(4px);
    border: 1px solid var(--color-border);
}

.label-left {
    left: 20px;
}

.label-right {
    right: 20px;
}

/* ----------------------------------------------------------------------------
   Placeholder Text
   ---------------------------------------------------------------------------- */

.placeholder {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #999;
    text-align: center;
    padding: 40px;
    width: 100%;
    box-sizing: border-box;
}

/* ----------------------------------------------------------------------------
   Playback Bar - Play/pause, frame step, scrubber, time display
   ---------------------------------------------------------------------------- */

.playback-bar {
    display: none;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: #f4f4f4;
    border-top: 1px solid var(--color-border);
}

.playback-bar.visible {
    display: flex;
}

.icon-button {
    flex-shrink: 0;
    padding: 8px 12px;
    font-size: 1rem;
    line-height: 1;
}

.playback-bar input[type="range"] {
    flex: 1;
    min-width: 0;
}

.time-display {
    flex-shrink: 0;
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

/* ----------------------------------------------------------------------------
   Toast Notifications
   ---------------------------------------------------------------------------- */

.notification {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 20px;
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: var(--z-index-hamburger);
    opacity: 0;
    transition: opacity var(--transition-medium);
}

.notification.show {
    opacity: 1;
}

/* ----------------------------------------------------------------------------
   Responsive Styles
   ---------------------------------------------------------------------------- */

@media (max-width: 768px) {
    main h1 {
        font-size: 1.5rem;
    }

    main .button-group {
        flex-direction: column;
    }

    main .button-group button {
        width: 100%;
    }

    .control-row {
        flex-direction: column;
        gap: 16px;
    }

    .label {
        font-size: 0.8rem;
        padding: 6px 12px;
        top: 34px;
    }

    .label-left {
        left: 10px;
    }

    .label-right {
        right: 10px;
    }

    .status-hud {
        font-size: 0.7rem;
        gap: 8px;
    }

    .status-hud .hud-shortcuts {
        display: none;
    }

    .playback-bar {
        flex-wrap: wrap;
    }

    .time-display {
        order: 1;
        width: 100%;
        text-align: center;
    }
}