/* ===========================================================================
   PHASE 2: FUNCTIONALITY ENHANCEMENTS - CSS
   Features: Collapsible sections, Settings panel, Filters, Batch actions
   =========================================================================== */

/* ===== COLLAPSIBLE SECTIONS ===== */
.card-header {
    transition: background 0.3s ease;
}

.card-header:hover .collapse-icon {
    color: var(--theme-accent, #8A2BE2);
}

.card-body {
    transition: all 0.3s ease;
    overflow: hidden;
}

/* ===== SETTINGS BUTTON ===== */
.settings-btn {
    position: fixed;
    top: 15px;
    right: 80px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: 2px solid rgba(255, 255, 255, 0.15);
    color: white;
    font-size: 1.1rem;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.35);
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
}

.settings-btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.5);
}

.settings-btn i {
    transition: transform 0.4s ease;
}

.settings-btn:hover i {
    transform: rotate(90deg);
}

/* ===== SETTINGS MODAL ===== */
.settings-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    z-index: 10000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.settings-modal-content {
    background: var(--theme-bg-secondary, #1A1A1A);
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 85vh;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--theme-border, #333);
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.settings-header {
    padding: 20px 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.settings-header h3 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.settings-close {
    background: rgba(255, 255, 255, 0.15);
    border: none;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.settings-close:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: rotate(90deg);
}

.settings-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
}

.settings-section {
    margin-bottom: 28px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--theme-border, #333);
}

.settings-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.settings-section h4 {
    color: var(--theme-text-primary, #E8E8E8);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.settings-section h4 i {
    color: var(--theme-accent, #8A2BE2);
}

.settings-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.settings-row label {
    flex: 1;
    color: var(--theme-text-secondary, #B0B0B0);
    font-size: 0.9rem;
    margin: 0;
}

.settings-row input[type="number"],
.settings-row input[type="range"],
.settings-row select {
    flex: 0 0 120px;
    background: var(--theme-bg-primary, #0D0D0D);
    border: 1px solid var(--theme-border, #333);
    color: var(--theme-text-primary, #E8E8E8);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
}

.settings-row input[type="range"] {
    flex: 0 0 150px;
}

.settings-row span {
    flex: 0 0 50px;
    color: var(--theme-accent, #8A2BE2);
    font-weight: 600;
    font-size: 0.9rem;
}

.settings-toggle {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    cursor: pointer;
    user-select: none;
}

.settings-toggle input[type="checkbox"] {
    display: none;
}

.toggle-slider {
    width: 50px;
    height: 26px;
    background: #444;
    border-radius: 13px;
    position: relative;
    transition: background 0.3s ease;
}

.toggle-slider::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s ease;
}

.settings-toggle input:checked + .toggle-slider {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.settings-toggle input:checked + .toggle-slider::after {
    transform: translateX(24px);
}

.toggle-label {
    color: var(--theme-text-primary, #E8E8E8);
    font-size: 0.9rem;
}

.settings-footer {
    padding: 16px 24px;
    background: var(--theme-bg-tertiary, #252525);
    border-top: 1px solid var(--theme-border, #333);
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.btn-reset,
.btn-save {
    padding: 10px 24px;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-reset {
    background: #444;
    color: white;
}

.btn-reset:hover {
    background: #555;
}

.btn-save {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.btn-save:hover {
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
    transform: translateY(-1px);
}

/* ===== FILTER CONTROLS ===== */
.filter-controls {
    margin-bottom: 16px;
    padding: 12px;
    background: var(--theme-bg-tertiary, #252525);
    border-radius: 8px;
    border: 1px solid var(--theme-border, #333);
}

.filter-row {
    display: flex;
    gap: 12px;
    align-items: center;
}

.filter-search {
    flex: 1;
    background: var(--theme-bg-primary, #0D0D0D);
    border: 1px solid var(--theme-border, #333);
    color: var(--theme-text-primary, #E8E8E8);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.filter-search:focus {
    outline: none;
    border-color: var(--theme-accent, #8A2BE2);
    box-shadow: 0 0 0 3px rgba(138, 43, 226, 0.15);
}

.filter-sort {
    flex: 0 0 150px;
    background: var(--theme-bg-primary, #0D0D0D);
    border: 1px solid var(--theme-border, #333);
    color: var(--theme-text-primary, #E8E8E8);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
}

.filter-clear-btn {
    flex: 0 0 40px;
    height: 40px;
    background: #444;
    border: none;
    color: white;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.filter-clear-btn:hover {
    background: #d9534f;
}

/* ===== BATCH ACTIONS ===== */
.batch-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: rgba(138, 43, 226, 0.15);
    border-radius: 6px;
    border: 1px solid var(--theme-accent, #8A2BE2);
}

.batch-count {
    color: var(--theme-accent, #8A2BE2);
    font-weight: 600;
    font-size: 0.85rem;
}

.batch-btn {
    width: 32px;
    height: 32px;
    background: var(--theme-accent, #8A2BE2);
    border: none;
    color: white;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.batch-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(138, 43, 226, 0.4);
}

.batch-copy:hover {
    background: #28a745;
}

.batch-export:hover {
    background: #17a2b8;
}

.batch-delete:hover {
    background: #dc3545;
}

.batch-checkbox {
    appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--theme-border, #333);
    border-radius: 4px;
    background: var(--theme-bg-primary, #0D0D0D);
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
}

.batch-checkbox:checked {
    background: var(--theme-accent, #8A2BE2);
    border-color: var(--theme-accent, #8A2BE2);
}

.batch-checkbox:checked::after {
    content: '\2713';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.batch-checkbox:hover {
    border-color: var(--theme-accent, #8A2BE2);
}

.batch-select-all {
    font-size: 0.85rem !important;
    padding: 4px 8px !important;
}

/* ===== LIGHT MODE OVERRIDES ===== */
html[data-theme="light"] .settings-btn {
    background: linear-gradient(135deg, #7C3AED 0%, #5B21B6 100%);
    box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
}

html[data-theme="light"] .settings-modal-content {
    background: #FFFFFF;
    border-color: #E2E8F0;
}

html[data-theme="light"] .settings-header {
    background: linear-gradient(135deg, #7C3AED 0%, #5B21B6 100%);
}

html[data-theme="light"] .settings-body {
    background: #F7FAFC;
}

html[data-theme="light"] .settings-section {
    border-bottom-color: #E2E8F0;
}

html[data-theme="light"] .settings-row input,
html[data-theme="light"] .settings-row select {
    background: #FFFFFF;
    border-color: #CBD5E0;
    color: #2D3748;
}

html[data-theme="light"] .toggle-slider {
    background: #CBD5E0;
}

html[data-theme="light"] .settings-footer {
    background: #F7FAFC;
    border-top-color: #E2E8F0;
}

html[data-theme="light"] .filter-controls {
    background: #F7FAFC;
    border-color: #E2E8F0;
}

html[data-theme="light"] .filter-search,
html[data-theme="light"] .filter-sort {
    background: #FFFFFF;
    border-color: #CBD5E0;
    color: #2D3748;
}

html[data-theme="light"] .filter-clear-btn {
    background: #E2E8F0;
    color: #4A5568;
}

html[data-theme="light"] .batch-checkbox {
    background: #FFFFFF;
    border-color: #CBD5E0;
}

/* ===== MOBILE RESPONSIVE ===== */
@media (max-width: 768px) {
    .settings-btn {
        top: 70px;
        right: 70px;
        width: 42px;
        height: 42px;
        font-size: 1rem;
    }

    .settings-modal-content {
        width: 95%;
        max-height: 90vh;
    }

    .settings-header h3 {
        font-size: 1.1rem;
    }

    .settings-body {
        padding: 16px;
    }

    .settings-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .settings-row input[type="number"],
    .settings-row input[type="range"],
    .settings-row select {
        width: 100%;
        flex: 1;
    }

    .filter-row {
        flex-direction: column;
    }

    .filter-search,
    .filter-sort {
        width: 100%;
        flex: 1;
    }

    .batch-controls {
        flex-wrap: wrap;
    }
}