/* ===== CSS Variables & Theme ===== */
:root {
    /* Colors - Light Theme */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-hover: #f1f5f9;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --text-inverse: #ffffff;

    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);

    --border-color: #e2e8f0;
    --border-light: #f1f5f9;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

    --danger: #ef4444;
    --success: #22c55e;
    --warning: #f59e0b;

    /* Sizing */
    --sidebar-width: 280px;
    --header-height: 72px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;
    --bg-hover: #334155;

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;

    --border-color: #334155;
    --border-light: #1e293b;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* ===== Reset & Base ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input,
textarea,
select {
    font-family: inherit;
    font-size: 1rem;
}

a {
    text-decoration: none;
    color: inherit;
}

/* ===== App Container ===== */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* ===== Sidebar ===== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 100;
    transition: transform var(--transition-normal);
}

.sidebar-header {
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 1.5rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--bg-hover);
    transform: rotate(15deg);
}

.theme-icon {
    font-size: 1.2rem;
}

.sidebar-section {
    padding: 16px 20px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

.section-header .section-title {
    margin-bottom: 0;
}

/* Quick Filters */
.quick-filters {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.filter-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    width: 100%;
    text-align: left;
}

.filter-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.filter-btn.active {
    background: var(--accent-gradient);
    color: var(--text-inverse);
}

.filter-btn .count {
    margin-left: auto;
    font-size: 0.8rem;
    padding: 2px 8px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.2);
}

.filter-btn:not(.active) .count {
    background: var(--bg-tertiary);
}

/* Folders */
.add-folder-btn {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all var(--transition-fast);
}

.add-folder-btn:hover {
    background: var(--accent-primary);
    color: var(--text-inverse);
    transform: rotate(90deg);
}

.folders-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 200px;
    overflow-y: auto;
}

.folder-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.folder-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.folder-item.active {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.folder-color {
    width: 12px;
    height: 12px;
    border-radius: 4px;
    flex-shrink: 0;
}

.folder-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.folder-count {
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.folder-actions {
    display: none;
    gap: 4px;
}

.folder-item:hover .folder-actions {
    display: flex;
}

.folder-item:hover .folder-count {
    display: none;
}

.folder-action-btn {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    transition: all var(--transition-fast);
}

.folder-action-btn:hover {
    background: var(--bg-tertiary);
}

.folder-action-btn.delete:hover {
    background: var(--danger);
    color: white;
}

/* Tags Cloud */
.tags-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag-item {
    padding: 4px 12px;
    border-radius: 999px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tag-item:hover {
    background: var(--accent-primary);
    color: var(--text-inverse);
    transform: translateY(-2px);
}

.tag-item.active {
    background: var(--accent-primary);
    color: var(--text-inverse);
}

/* Sync Button */
.sync-section {
    margin-top: auto;
    padding-bottom: 20px;
}

.sync-btn {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.sync-btn:hover {
    background: var(--accent-primary);
    color: var(--text-inverse);
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.main-header {
    height: var(--header-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.sidebar-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.sidebar-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* Search */
.search-container {
    flex: 1;
    max-width: 500px;
    position: relative;
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1rem;
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 12px 40px 12px 48px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: var(--bg-secondary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.clear-search {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-hover);
    color: var(--text-tertiary);
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
}

.search-input:not(:placeholder-shown)+.clear-search {
    display: flex;
}

.clear-search:hover {
    background: var(--text-tertiary);
    color: var(--text-inverse);
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Sort Dropdown */
.sort-dropdown {
    position: relative;
}

.sort-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.sort-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.sort-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 160px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 100;
}

.sort-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.sort-option {
    display: block;
    width: 100%;
    padding: 10px 16px;
    text-align: left;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.sort-option:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.sort-option.active {
    color: var(--accent-primary);
    font-weight: 500;
}

/* View Toggle */
.view-toggle {
    display: flex;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.view-btn {
    padding: 10px 14px;
    color: var(--text-tertiary);
    font-size: 1.1rem;
    transition: all var(--transition-fast);
}

.view-btn:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.view-btn.active {
    background: var(--accent-primary);
    color: var(--text-inverse);
}

/* Add Bookmark Button */
.add-bookmark-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: var(--accent-gradient);
    color: var(--text-inverse);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
}

.add-bookmark-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.add-bookmark-btn:active {
    transform: translateY(0);
}

.btn-icon {
    font-size: 1.2rem;
}

/* ===== Content Area ===== */
.content-area {
    flex: 1;
    padding: 24px;
}

.current-view-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.current-view-info h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.bookmark-count {
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

/* Bookmarks Grid */
.bookmarks-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.bookmarks-container.list-view {
    grid-template-columns: 1fr;
}

/* Bookmark Card */
.bookmark-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all var(--transition-normal);
    position: relative;
}

.bookmark-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

.bookmark-thumbnail {
    width: 100%;
    height: 160px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.bookmark-thumbnail img,
.bookmark-thumbnail video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.bookmark-thumbnail .placeholder-icon {
    font-size: 3rem;
    opacity: 0.5;
}

.bookmark-favorite {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.bookmark-favorite:hover {
    transform: scale(1.1);
}

.bookmark-favorite.active {
    background: #fef3c7;
}

.bookmark-info {
    padding: 16px;
}

.bookmark-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.bookmark-url {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 8px;
}

.bookmark-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
}

.bookmark-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid var(--border-light);
}

.bookmark-folder {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.bookmark-folder .folder-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.bookmark-date {
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.bookmark-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.bookmark-tag {
    padding: 2px 8px;
    border-radius: 999px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.bookmark-actions {
    position: absolute;
    top: 12px;
    left: 12px;
    display: flex;
    gap: 8px;
    opacity: 0;
    transition: all var(--transition-fast);
}

.bookmark-card:hover .bookmark-actions {
    opacity: 1;
}

.bookmark-action-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.bookmark-action-btn:hover {
    transform: scale(1.1);
}

.bookmark-action-btn.edit:hover {
    background: var(--accent-primary);
    color: white;
}

.bookmark-action-btn.delete:hover {
    background: var(--danger);
    color: white;
}

.bookmark-link-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    cursor: pointer;
}

.bookmark-card .bookmark-favorite,
.bookmark-card .bookmark-actions,
.bookmark-card .bookmark-action-btn {
    z-index: 2;
}

/* List View */
.list-view .bookmark-card {
    display: flex;
    height: auto;
}

.list-view .bookmark-thumbnail {
    width: 120px;
    height: 100%;
    min-height: 100px;
    flex-shrink: 0;
}

.list-view .bookmark-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.list-view .bookmark-actions {
    position: static;
    opacity: 1;
    padding: 16px;
    flex-direction: column;
}

.list-view .bookmark-favorite {
    position: static;
}

/* Empty State */
.empty-state {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    text-align: center;
}

.empty-state.visible {
    display: flex;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.empty-state h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.add-first-btn {
    padding: 12px 24px;
    background: var(--accent-gradient);
    color: var(--text-inverse);
    border-radius: var(--radius-md);
    font-weight: 500;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
}

.add-first-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ===== Modals ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    backdrop-filter: blur(4px);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 540px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: scale(0.9) translateY(20px);
    transition: all var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-small {
    max-width: 400px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.modal-form {
    padding: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: var(--bg-secondary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* Thumbnail Upload */
.thumbnail-upload {
    position: relative;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px 20px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.upload-area:hover {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.05);
}

.upload-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 8px;
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.upload-hint {
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.thumbnail-preview {
    display: none;
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.thumbnail-preview.visible {
    display: block;
}

.thumbnail-preview img,
.thumbnail-preview video {
    width: 100%;
    max-height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
}

.thumbnail-preview video {
    display: none;
}

.thumbnail-preview.video img {
    display: none;
}

.thumbnail-preview.video video {
    display: block;
}

.remove-thumbnail {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    transition: all var(--transition-fast);
}

.remove-thumbnail:hover {
    background: var(--danger);
}

/* Checkbox */
.checkbox-group {
    margin-top: 8px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.checkbox-label input {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.checkbox-label input:checked+.checkmark {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.checkbox-label input:checked+.checkmark::after {
    content: "✓";
    color: white;
    font-size: 0.75rem;
}

/* Color Picker */
.color-picker {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.color-option {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 3px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.color-option:hover {
    transform: scale(1.1);
}

.color-option.active {
    border-color: var(--text-primary);
    box-shadow: 0 0 0 2px var(--bg-secondary);
}

/* Form Actions */
.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
    margin-top: 20px;
    margin: 0 -24px -24px;
}

.modal-body+.form-actions {
    margin-top: 0;
}

.btn {
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--accent-gradient);
    color: var(--text-inverse);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    opacity: 0.9;
}

/* ===== Toast Notifications ===== */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 2000;
}

.toast {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--accent-primary);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.success {
    border-left-color: var(--success);
}

.toast.error {
    border-left-color: var(--danger);
}

.toast.warning {
    border-left-color: var(--warning);
}

.toast-icon {
    font-size: 1.2rem;
}

.toast-message {
    flex: 1;
    font-size: 0.9rem;
}

.toast-close {
    color: var(--text-tertiary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.toast-close:hover {
    color: var(--text-primary);
}

/* ===== Sidebar Overlay (Mobile) ===== */
.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    backdrop-filter: blur(2px);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Sidebar Close Button (Mobile) */
.sidebar-close {
    display: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all var(--transition-fast);
}

.sidebar-close:hover {
    background: var(--danger);
    color: white;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .sidebar-toggle {
        display: flex;
    }

    .sidebar-close {
        display: flex;
    }

    /* Prevent body scroll when sidebar is open */
    body.sidebar-open {
        overflow: hidden;
    }
}

@media (max-width: 768px) {
    .main-header {
        padding: 0 12px;
        gap: 10px;
    }

    .header-actions {
        gap: 6px;
    }

    .sort-btn span:last-child,
    .add-bookmark-btn .btn-text {
        display: none;
    }

    .add-bookmark-btn {
        padding: 10px;
    }

    .sort-btn {
        padding: 8px 12px;
    }

    .view-btn {
        padding: 8px 10px;
    }

    .content-area {
        padding: 16px;
    }

    .bookmarks-container {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    /* Improve bookmark card touch targets */
    .bookmark-actions {
        opacity: 1;
    }

    .bookmark-action-btn {
        width: 40px;
        height: 40px;
    }

    .bookmark-favorite {
        width: 40px;
        height: 40px;
    }

    /* Toast on mobile */
    .toast-container {
        left: 16px;
        right: 16px;
        bottom: 16px;
    }

    .toast {
        width: 100%;
    }

    /* Current view info mobile */
    .current-view-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .current-view-info h2 {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .search-container {
        display: none;
    }

    .modal {
        margin: 10px;
        max-height: calc(100vh - 20px);
        border-radius: var(--radius-lg);
    }

    .modal-header {
        padding: 16px 20px;
    }

    .modal-form {
        padding: 16px 20px;
    }

    .form-actions {
        padding: 16px 20px;
        margin: 0 -20px -16px;
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
        text-align: center;
    }

    /* Sidebar full width on very small screens */
    .sidebar {
        width: 100%;
    }

    /* Hamburger button styling */
    .sidebar-toggle {
        padding: 10px;
    }

    .sidebar-toggle span {
        width: 20px;
    }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}