/* CSS Custom Properties */
:root {
    /* Theme colors (overridden by JS) */
    --theme-bg: #f7f7f7;
    --theme-text: #171717;
    --theme-heading: #171717;

    --color-bg: var(--theme-bg);
    --color-surface: #ffffff;
    --color-text: var(--theme-text);
    --color-text-muted: #737373;
    --color-border: #e5e5e5;
    --color-border-focus: #a3a3a3;
    --color-primary: var(--theme-heading);
    --color-primary-hover: #404040;
    --color-danger: #dc2626;
    --color-danger-hover: #b91c1c;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12), 0 4px 12px rgba(0, 0, 0, 0.06);
    --radius: 8px;
    --radius-sm: 6px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --line-height: 1.4rem;
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --color-bg: var(--theme-bg);
    --color-surface: #171717;
    --color-text: var(--theme-text);
    --color-text-muted: #a3a3a3;
    --color-border: #262626;
    --color-border-focus: #525252;
    --color-primary: var(--theme-heading);
    --color-primary-hover: #d4d4d4;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4), 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5), 0 4px 12px rgba(0, 0, 0, 0.3);
}

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

/* Base */
html {
    font-size: 16px;
}

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
}

/* Floating controls */
.floating-controls {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    z-index: 100;
}

.text-link {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.8125rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.text-link:hover {
    color: var(--color-text);
}

.text-link:focus-visible {
    outline: 2px solid var(--color-text);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.5rem 0.875rem;
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: -0.01em;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: 36px;
    user-select: none;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn:focus-visible {
    outline: 2px solid var(--color-text);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-bg);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--color-border-focus);
    background: var(--color-bg);
}

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

.btn-danger:hover:not(:disabled) {
    background: var(--color-danger-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-danger:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.icon-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.icon-btn:hover {
    background: var(--color-border);
}

.icon-btn:active {
    transform: scale(0.95);
}

.icon-btn:focus-visible {
    outline: 2px solid var(--color-text);
    outline-offset: 2px;
}

/* Theme toggle */
.theme-icon-light,
.theme-icon-dark {
    font-size: 0.9375rem;
}

[data-theme="dark"] .theme-icon-light,
:root:not([data-theme="dark"]) .theme-icon-dark {
    display: none;
}

/* Main content */
.main {
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

/* Categories Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg) var(--spacing-md);
    align-items: start;
}

@media (max-width: 1199px) {
    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 899px) {
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 599px) {
    .categories-grid {
        grid-template-columns: 1fr;
    }

    .floating-controls {
        bottom: var(--spacing-sm);
        right: var(--spacing-sm);
    }
}

/* Category - no card styling */
.category {
    min-width: 0;
}

.category-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    line-height: var(--line-height);
}

.category-title {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--theme-heading);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.category-actions {
    display: none;
    gap: 0;
}

.category:hover .category-actions,
.category.sortable-chosen .category-actions {
    display: flex;
}

.category:hover .category-drag-handle,
.category.sortable-chosen .category-drag-handle {
    display: inline;
}

.category-drag-handle {
    cursor: grab;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    line-height: var(--line-height);
    display: none;
}

.category-drag-handle:active {
    cursor: grabbing;
}

.action-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 2px 4px;
    color: var(--color-text-muted);
    font-size: 0.8125rem;
    line-height: var(--line-height);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: color var(--transition-fast), background var(--transition-fast);
    opacity: 0.7;
}

.action-btn:hover {
    color: var(--color-text);
    opacity: 1;
}

.action-btn:focus-visible {
    outline: 2px solid var(--color-text);
    outline-offset: 1px;
}

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

/* Bookmarks List */
.bookmarks-list {
    list-style: none;
}

.bookmark {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    line-height: var(--line-height);
}

.bookmark-drag-handle {
    cursor: grab;
    color: var(--color-text-muted);
    display: none;
    font-size: 0.875rem;
    line-height: var(--line-height);
}

.bookmark:hover .bookmark-drag-handle,
.bookmark.sortable-chosen .bookmark-drag-handle {
    display: inline;
}

.bookmark-drag-handle:active {
    cursor: grabbing;
}

.bookmark-link {
    flex: 1;
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.9375rem;
    line-height: var(--line-height);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: color var(--transition-fast);
}

.bookmark-link:hover {
    color: var(--color-text-muted);
}

.bookmark-link:focus-visible {
    outline: 2px solid var(--color-text);
    outline-offset: 2px;
    border-radius: 2px;
}

.bookmark-actions {
    display: none;
    gap: 0;
}

.bookmark:hover .bookmark-actions {
    display: flex;
}


/* Empty state */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    color: var(--color-text-muted);
}

.empty-state > p:first-child {
    font-size: 0.9375rem;
    color: var(--color-text);
}

.empty-hint {
    font-size: 0.8125rem;
    margin-top: var(--spacing-sm);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0);
    backdrop-filter: blur(0);
    -webkit-backdrop-filter: blur(0);
    transition: background var(--transition-normal), backdrop-filter var(--transition-normal);
}

.modal:not(.hidden) .modal-backdrop {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

[data-theme="dark"] .modal:not(.hidden) .modal-backdrop {
    background: rgba(0, 0, 0, 0.6);
}

.modal-content {
    position: relative;
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 380px;
    max-height: calc(100vh - var(--spacing-xl));
    overflow-y: auto;
    overflow-x: hidden;
    border: 1px solid var(--color-border);
    opacity: 0;
    transform: scale(0.96) translateY(8px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.modal:not(.hidden) .modal-content {
    opacity: 1;
    transform: scale(1) translateY(0);
}

.modal.closing .modal-backdrop {
    background: rgba(0, 0, 0, 0);
    backdrop-filter: blur(0);
    -webkit-backdrop-filter: blur(0);
}

.modal.closing .modal-content {
    opacity: 0;
    transform: scale(0.96) translateY(8px);
}

.modal-content-small {
    max-width: 320px;
}

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

.modal-header h2 {
    font-size: 0.9375rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1.125rem;
    cursor: pointer;
    color: var(--color-text-muted);
    line-height: 1;
    transition: background var(--transition-fast), color var(--transition-fast);
    margin: -4px -8px -4px 0;
}

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

.modal-close:focus-visible {
    outline: 2px solid var(--color-text);
    outline-offset: 2px;
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-body > p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    line-height: 1.5;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-md);
}

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

.form-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.form-group input {
    width: 100%;
    padding: 0.625rem 0.75rem;
    font-family: inherit;
    font-size: 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.form-group input::placeholder {
    color: var(--color-text-muted);
    opacity: 0.6;
}

.form-group input:hover {
    border-color: var(--color-border-focus);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-text);
    background: var(--color-surface);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .form-group input:focus {
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.05);
}

.form-error {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-danger);
    font-size: 0.8125rem;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(220, 38, 38, 0.08);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(220, 38, 38, 0.2);
}

.form-error::before {
    content: "!";
    display: flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    background: var(--color-danger);
    color: white;
    font-size: 0.625rem;
    font-weight: 700;
    border-radius: 50%;
    flex-shrink: 0;
}

/* Utility classes */
.hidden {
    display: none !important;
}

/* Drag and drop styles */
.sortable-ghost {
    opacity: 0.3;
}

.sortable-drag {
    opacity: 1;
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-sm);
}

.sortable-chosen {
    background: var(--color-bg);
    border-radius: var(--radius-sm);
}

/* Admin-only elements */
.admin-only {
    display: none;
}

body.is-admin .admin-only {
    display: inline-flex;
}

/* Theme picker modal */
.theme-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.theme-option {
    display: flex;
    flex-direction: column;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color var(--transition-fast), transform var(--transition-fast);
    overflow: hidden;
    background: var(--color-surface);
    padding: var(--spacing-sm);
}

.theme-option:hover {
    border-color: var(--color-border-focus);
    transform: translateY(-1px);
}

.theme-option.active {
    border-color: var(--color-primary);
}

.theme-option:focus-visible {
    outline: 2px solid var(--color-text);
    outline-offset: 2px;
}

.theme-preview {
    display: flex;
    gap: 2px;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.theme-swatch {
    flex: 1;
    height: 28px;
}

.theme-name {
    padding: var(--spacing-sm) 0 0 0;
    font-size: 0.75rem;
    font-weight: 500;
    text-align: center;
    color: var(--color-text-muted);
}

.theme-option.active .theme-name {
    color: var(--color-text);
}