/**
 * Audio Merger - Tool Specific Styles
 * Base styles come from /src/styles/layouts/tool-layout.css
 */

/* ==================== FILE LIST SECTION ==================== */
.file-list-section {
    margin-top: var(--space-4);
}

/* ==================== FILE LIST HEADER ==================== */
.file-list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-3);
    gap: var(--space-3);
}

.file-list-header__info {
    flex: 1;
    min-width: 0;
}

.file-list-header__title {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--color-text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.file-list-header__count {
    font-weight: var(--font-normal);
    color: var(--color-text-muted);
}

.file-list-header__duration {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

/* ==================== FILE LIST ==================== */
.file-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
    padding: var(--space-3);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    min-height: 100px;
}

/* ==================== FILE ITEM ==================== */
.file-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    cursor: grab;
    transition: all var(--transition-fast);
    user-select: none;
}

.file-item:hover {
    border-color: var(--color-border-emphasis);
    background: var(--color-interactive-muted);
}

.file-item.dragging {
    opacity: 0.5;
    cursor: grabbing;
    border-color: var(--color-text-primary);
    background: var(--color-interactive-muted);
}

/* Drag Handle */
.file-item__drag-handle {
    flex-shrink: 0;
    color: var(--color-text-muted);
    cursor: grab;
    padding: var(--space-1);
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.file-item:hover .file-item__drag-handle {
    opacity: 1;
}

.file-item.dragging .file-item__drag-handle {
    cursor: grabbing;
}

/* Number */
.file-item__number {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-interactive-muted);
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
}

/* Info */
.file-item__info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.file-item__name {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-item__duration {
    font-size: var(--text-xs);
    font-family: var(--font-mono);
    color: var(--color-text-muted);
}

/* Play Button */
.file-item__play {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-interactive-muted);
    border: none;
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.file-item__play:hover {
    background: var(--color-text-primary);
    color: var(--color-bg-primary);
}

.file-item__play.playing {
    background: var(--color-text-primary);
    color: var(--color-bg-primary);
}

/* Remove Button */
.file-item__remove {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    opacity: 0.5;
}

.file-item:hover .file-item__remove {
    opacity: 1;
}

.file-item__remove:hover {
    background: var(--color-status-error);
    color: white;
}

/* ==================== OUTPUT SETTINGS ==================== */
.output-settings {
    padding: var(--space-4);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
}

/* ==================== FORM ELEMENTS ==================== */
.form-group {
    margin-bottom: var(--space-4);
}

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

.form-group.hidden {
    display: none;
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.form-helper {
    display: block;
    font-size: var(--text-base);
    color: var(--color-text-muted);
    margin-top: var(--space-2);
}

/* ==================== CHOICE GROUP ==================== */
.choice-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.choice-btn {
    padding: var(--space-2) var(--space-4);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.choice-btn:hover {
    background: var(--color-interactive-muted);
    border-color: var(--color-border-emphasis);
    color: var(--color-text-primary);
}

.choice-btn.active {
    background: var(--color-text-primary);
    border-color: var(--color-text-primary);
    color: var(--color-bg-primary);
}

/* ==================== ACTION BUTTONS ==================== */
.action-buttons {
    margin-bottom: var(--space-4);
}

/* ==================== BUTTON VARIATIONS ==================== */
.btn--lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--text-base);
}

.btn--full {
    width: 100%;
}

.btn--sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
}

/* ==================== PROGRESS SECTION ==================== */
.progress-section {
    margin-bottom: var(--space-4);
    padding: var(--space-4);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    animation: fadeIn 0.2s ease;
}

.progress-section__header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.progress-section__label {
    flex: 1;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
}

.progress-section__percent {
    font-size: var(--text-sm);
    font-family: var(--font-mono);
    color: var(--color-text-secondary);
}

.progress-section__bar {
    height: 4px;
    background: var(--color-bg-overlay);
    border-radius: 2px;
    overflow: hidden;
}

.progress-section__fill {
    height: 100%;
    background: var(--color-text-primary);
    width: 0%;
    transition: width 0.15s ease;
}

.progress-section__detail {
    margin-top: var(--space-2);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.progress-section__detail:empty {
    display: none;
}

/* ==================== RESET CONTAINER ==================== */
.reset-container {
    text-align: center;
}

/* ==================== UPLOAD LOADING STATE ==================== */
.upload-zone.loading {
    pointer-events: none;
}

.upload-zone.loading .upload-zone__content {
    opacity: 0;
}

/* ==================== HIDDEN STATE ==================== */
.drop-zone__input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    cursor: pointer;
}

/* ==================== ANIMATIONS ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 480px) {
    .file-list-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .file-item {
        padding: var(--space-2);
        gap: var(--space-2);
    }

    .file-item__drag-handle {
        display: none;
    }

    .file-item__number {
        width: 20px;
        height: 20px;
        font-size: var(--text-xs);
    }

    .file-item__info {
        flex-direction: row;
        align-items: center;
        gap: var(--space-2);
    }

    .file-item__name {
        font-size: var(--text-xs);
    }

    .file-item__play {
        width: 28px;
        height: 28px;
    }

    .choice-group {
        gap: var(--space-1);
    }

    .choice-btn {
        padding: var(--space-2) var(--space-3);
        font-size: var(--text-xs);
    }

    .output-settings {
        padding: var(--space-3);
    }
}