/* ============================================================
   FeedFlow — CSS Design System
   Modern RSS Reader with Light/Dark theme support
   ============================================================ */

/* --- CSS Custom Properties (Light Theme - Default) --- */
:root {
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.7rem;
    --font-size-sm: 0.8rem;
    --font-size-base: 0.9rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.15rem;
    --font-size-xl: 1.4rem;
    --font-size-2xl: 1.75rem;

    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.12);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Colors - Light Theme */
    --color-bg: #f5f6fa;
    --color-bg-elevated: #ffffff;
    --color-bg-hover: #f0f1f5;
    --color-bg-active: #e8e9ef;
    --color-surface: #ffffff;
    --color-surface-hover: #fafbfd;

    --color-text: #1a1d26;
    --color-text-secondary: #5a5f72;
    --color-text-tertiary: #8e93a6;
    --color-text-inverse: #ffffff;

    --color-border: #e2e4ec;
    --color-border-light: #eef0f6;

    --color-primary: #4f6ef7;
    --color-primary-hover: #3b5ce0;
    --color-primary-soft: #eef1fe;
    --color-primary-text: #ffffff;

    --color-accent: #10b981;
    --color-accent-hover: #059669;
    --color-accent-soft: #ecfdf5;

    --color-danger: #ef4444;
    --color-danger-hover: #dc2626;
    --color-danger-soft: #fef2f2;

    --color-warning: #f59e0b;
    --color-warning-soft: #fffbeb;

    --color-header-bg: #ffffff;
    --color-header-border: #e2e4ec;

    --color-sidebar-bg: #fafbfd;
    --color-sidebar-border: #e2e4ec;

    --color-card-bg: #ffffff;
    --color-card-border: #e8eaf2;

    --color-input-bg: #f5f6fa;
    --color-input-border: #d8dae6;
    --color-input-focus-border: #4f6ef7;
    --color-input-focus-ring: rgba(79, 110, 247, 0.2);

    --color-modal-overlay: rgba(15, 17, 26, 0.45);

    --color-toast-bg: #1a1d26;
    --color-toast-text: #ffffff;

    --color-scrollbar-track: #f0f1f5;
    --color-scrollbar-thumb: #c8cbd6;

    /* Layout */
    --header-height: 60px;
    --sidebar-width: 320px;
}

/* --- Dark Theme --- */
[data-theme="dark"] {
    --color-bg: #0f1117;
    --color-bg-elevated: #181b25;
    --color-bg-hover: #1e2130;
    --color-bg-active: #262a38;
    --color-surface: #1a1d28;
    --color-surface-hover: #22253a;

    --color-text: #e8eaf2;
    --color-text-secondary: #a0a5b8;
    --color-text-tertiary: #6b7088;
    --color-text-inverse: #0f1117;

    --color-border: #2a2d3e;
    --color-border-light: #1f2233;

    --color-primary: #6b8aff;
    --color-primary-hover: #5a75f0;
    --color-primary-soft: rgba(107, 138, 255, 0.12);
    --color-primary-text: #ffffff;

    --color-accent: #34d399;
    --color-accent-hover: #2abf89;
    --color-accent-soft: rgba(52, 211, 153, 0.12);

    --color-danger: #f87171;
    --color-danger-hover: #ef4444;
    --color-danger-soft: rgba(248, 113, 113, 0.12);

    --color-warning: #fbbf24;
    --color-warning-soft: rgba(251, 191, 36, 0.12);

    --color-header-bg: #14161f;
    --color-header-border: #2a2d3e;

    --color-sidebar-bg: #14161f;
    --color-sidebar-border: #2a2d3e;

    --color-card-bg: #181b25;
    --color-card-border: #2a2d3e;

    --color-input-bg: #1a1d28;
    --color-input-border: #2e3148;
    --color-input-focus-border: #6b8aff;
    --color-input-focus-ring: rgba(107, 138, 255, 0.25);

    --color-modal-overlay: rgba(0, 0, 0, 0.7);

    --color-toast-bg: #2a2d3e;
    --color-toast-text: #e8eaf2;

    --color-scrollbar-track: #181b25;
    --color-scrollbar-thumb: #3a3d4e;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.5);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    overflow: hidden;
    height: 100vh;
    transition: background-color var(--transition-base), color var(--transition-base);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
    width: 7px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-scrollbar-thumb);
    border-radius: var(--radius-full);
}

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

/* --- Header --- */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-header-bg);
    border-bottom: 1px solid var(--color-header-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-6);
    z-index: 100;
    backdrop-filter: blur(12px);
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-width: 180px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo-icon {
    width: 26px;
    height: 26px;
    color: var(--color-primary);
}

.logo h1 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-center {
    flex: 1;
    max-width: 520px;
    margin: 0 var(--space-6);
}

.search-bar {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: var(--space-3);
    width: 18px;
    height: 18px;
    color: var(--color-text-tertiary);
    pointer-events: none;
}

.search-bar input {
    width: 100%;
    padding: var(--space-2) var(--space-8) var(--space-2) var(--space-8);
    background: var(--color-input-bg);
    border: 1px solid var(--color-input-border);
    border-radius: var(--radius-full);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-base);
}

.search-bar input:focus {
    border-color: var(--color-input-focus-border);
    box-shadow: 0 0 0 3px var(--color-input-focus-ring);
    background: var(--color-bg-elevated);
}

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

.search-clear {
    position: absolute;
    right: var(--space-2);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-tertiary);
    font-size: var(--font-size-lg);
    padding: var(--space-1) var(--space-2);
    line-height: 1;
    display: none;
    transition: color var(--transition-fast);
}

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

.search-clear.visible {
    display: block;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition-fast);
    outline: none;
}

.btn:focus-visible {
    box-shadow: 0 0 0 3px var(--color-input-focus-ring);
}

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
    border-radius: var(--radius-sm);
}

.btn-icon {
    padding: var(--space-2);
    background: transparent;
    color: var(--color-text-secondary);
    border: none;
}

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

.btn-icon svg {
    width: 20px;
    height: 20px;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--color-text-secondary);
    border-color: var(--color-border);
}

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

.btn-accent {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

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

.btn-danger {
    background: var(--color-danger-soft);
    color: var(--color-danger);
    border-color: transparent;
}

.btn-danger:hover {
    background: var(--color-danger);
    color: #fff;
}

.btn-text {
    background: transparent;
    color: var(--color-text-secondary);
    border: none;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-sm);
}

.btn-text:hover,
.btn-text.active {
    background: var(--color-primary-soft);
    color: var(--color-primary);
}

.btn:disabled {
    opacity: 0.5;
    pointer-events: none;
}

/* --- Spinner --- */
.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

.btn-spinner {
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    display: inline-block;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* --- App Layout --- */
.app-layout {
    display: flex;
    height: calc(100vh - var(--header-height));
    margin-top: var(--header-height);
}

/* --- Sidebar --- */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--color-sidebar-bg);
    border-right: 1px solid var(--color-sidebar-border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.sidebar-section {
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border-light);
}

.sidebar-section:last-child {
    border-bottom: none;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-3);
}

.sidebar-header h2 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-tertiary);
}

/* --- Feed List --- */
.feed-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.feed-list-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-8) var(--space-4);
    color: var(--color-text-tertiary);
    text-align: center;
}

.feed-list-empty svg {
    margin-bottom: var(--space-3);
    opacity: 0.4;
}

.feed-list-empty p {
    font-weight: 500;
    margin-bottom: var(--space-1);
}

.feed-list-empty span {
    font-size: var(--font-size-xs);
}

.feed-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast);
    position: relative;
    animation: fadeIn var(--transition-base);
}

.feed-item:hover {
    background: var(--color-bg-hover);
}

.feed-item.active {
    background: var(--color-primary-soft);
}

.feed-item-icon {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    flex-shrink: 0;
    background: var(--color-bg-hover);
}

.feed-item-icon-placeholder {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--color-primary-soft), var(--color-accent-soft));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: var(--font-size-xs);
    font-weight: 700;
    color: var(--color-primary);
}

.feed-item-info {
    flex: 1;
    min-width: 0;
}

.feed-item-title {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.feed-item-count {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.feed-item-actions {
    display: flex;
    gap: var(--space-1);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.feed-item:hover .feed-item-actions {
    opacity: 1;
}

.feed-item-actions .btn-icon {
    padding: var(--space-1);
}

.feed-item-actions .btn-icon svg {
    width: 14px;
    height: 14px;
}

/* --- Web Search --- */
.web-search-box {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.web-search-box input {
    padding: var(--space-2) var(--space-3);
    background: var(--color-input-bg);
    border: 1px solid var(--color-input-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.web-search-box input:focus {
    border-color: var(--color-input-focus-border);
    box-shadow: 0 0 0 3px var(--color-input-focus-ring);
}

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

.search-filters {
    display: flex;
    gap: var(--space-2);
}

.filter-input {
    flex: 1;
    min-width: 0;
    font-size: var(--font-size-xs) !important;
    padding: var(--space-1) var(--space-2) !important;
}

/* --- Main Content --- */
.main-content {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* --- Toolbar --- */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-5);
    border-bottom: 1px solid var(--color-border-light);
    background: var(--color-bg-elevated);
    transition: background-color var(--transition-base);
    flex-shrink: 0;
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.sort-controls {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.sort-controls label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    font-weight: 500;
}

.select-input {
    padding: var(--space-1) var(--space-3);
    padding-right: var(--space-6);
    background: var(--color-input-bg);
    border: 1px solid var(--color-input-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-family);
    font-size: var(--font-size-xs);
    color: var(--color-text);
    outline: none;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238e93a6' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    transition: border-color var(--transition-fast);
}

.select-input:focus {
    border-color: var(--color-input-focus-border);
}

#sortOrderBtn svg {
    transition: transform var(--transition-fast);
}

#sortOrderBtn[data-order="asc"] svg {
    transform: rotate(180deg);
}

/* --- View Toggle --- */
.view-toggle {
    display: flex;
    align-items: center;
    gap: 2px;
    background: var(--color-bg-hover);
    border-radius: var(--radius-sm);
    padding: 2px;
}

.view-toggle .btn-icon {
    padding: var(--space-1);
    border-radius: var(--radius-sm);
    color: var(--color-text-tertiary);
}

.view-toggle .btn-icon[data-active="true"] {
    background: var(--color-bg-elevated);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

/* --- Articles --- */
.articles-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-3);
    align-content: start;
}

/* List layout */
.articles-container.layout-list {
    grid-template-columns: 1fr;
    gap: var(--space-1);
    padding: var(--space-3);
}

.articles-container.layout-list .article-card {
    flex-direction: row;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
}

.articles-container.layout-list .article-card:hover {
    transform: none;
}

.articles-container.layout-list .article-card-header {
    display: flex;
    align-items: center;
    margin-bottom: 0;
}

.articles-container.layout-list .article-card-feed span,
.articles-container.layout-list .article-card-feed-dot,
.articles-container.layout-list .article-card-date {
    display: none;
}

.articles-container.layout-list .article-content-wrapper {
    flex: 1;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: var(--font-size-sm);
    line-height: normal;
}

.articles-container.layout-list .article-card-title {
    display: inline;
    font-size: inherit;
    font-weight: 500;
    margin: 0;
}

.articles-container.layout-list .article-card-title::after {
    content: " - ";
    color: var(--color-text-tertiary);
    font-weight: normal;
}

.articles-container.layout-list .article-card-description {
    display: inline;
    font-size: inherit;
    color: var(--color-text-secondary);
    margin: 0;
}

.articles-container.layout-list .article-card-view-hint {
    display: none;
}

.articles-container.layout-list .article-card-footer {
    margin-top: 0;
    flex-shrink: 0;
}

.articles-container.layout-list .article-card-meta {
    display: none;
}

.articles-container.layout-list .article-card-link {
    font-size: var(--font-size-xs);
    padding: 2px var(--space-2);
}

.articles-empty {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-8);
    color: var(--color-text-tertiary);
    text-align: center;
    min-height: 300px;
}

.articles-empty svg {
    margin-bottom: var(--space-4);
    opacity: 0.3;
}

.articles-empty h3 {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--color-text-secondary);
}

/* --- Article Card --- */
.article-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: var(--radius-lg);
    padding: var(--space-3) var(--space-4);
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    animation: fadeInUp var(--transition-base);
    cursor: pointer;
}

.article-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.article-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-3);
}

.article-card-feed {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.article-card-feed-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-primary);
    flex-shrink: 0;
}

.article-feed-icon {
    width: 16px;
    height: 16px;
    border-radius: 2px;
    object-fit: contain;
    flex-shrink: 0;
}

.article-card-date {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    white-space: nowrap;
}

.article-card-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-text);
}

.article-card-title span {
    color: inherit;
}

/* --- Article View Modes --- */

/* Short: truncated description (default) */
.article-card.view-short .article-card-description {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Full: entire description visible */
.article-card.view-full .article-card-description {
    display: block;
    overflow: visible;
}

.article-card-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    margin-top: auto;
}

.article-card-meta {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.article-tag {
    display: inline-flex;
    align-items: center;
    padding: 2px var(--space-2);
    background: var(--color-primary-soft);
    color: var(--color-primary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.article-author {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

/* External link */
.article-card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-primary);
    text-decoration: none;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    flex-shrink: 0;
    white-space: nowrap;
}

.article-card-link:hover {
    background: var(--color-primary-soft);
    color: var(--color-primary-hover);
    text-decoration: none;
}

.article-card-link svg {
    width: 12px;
    height: 12px;
}

/* View mode indicator */
.article-card-view-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    opacity: 0;
    transition: opacity var(--transition-fast);
    text-align: right;
    margin-top: var(--space-1);
    pointer-events: none;
}

.article-card:hover .article-card-view-hint {
    opacity: 0.6;
}

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--color-modal-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    backdrop-filter: blur(4px);
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

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

.modal {
    background: var(--color-bg-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 440px;
    max-width: 90vw;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    transform: translateY(20px) scale(0.96);
    transition: transform var(--transition-base);
    overflow: hidden;
}

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

.modal-lg {
    width: 640px;
}

.modal-sm {
    width: 380px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-border-light);
}

.modal-header h2 {
    font-size: var(--font-size-md);
    font-weight: 600;
}

.modal-close {
    font-size: var(--font-size-xl);
    line-height: 1;
    color: var(--color-text-tertiary);
}

.modal-body {
    padding: var(--space-5) var(--space-6);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--color-border-light);
}

/* --- Form --- */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-group input {
    padding: var(--space-3) var(--space-4);
    background: var(--color-input-bg);
    border: 1px solid var(--color-input-border);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus {
    border-color: var(--color-input-focus-border);
    box-shadow: 0 0 0 3px var(--color-input-focus-ring);
}

.form-error {
    font-size: var(--font-size-sm);
    color: var(--color-danger);
    min-height: 20px;
    margin-top: var(--space-2);
}

/* --- Search Results --- */
.search-results {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.search-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-6);
    color: var(--color-text-tertiary);
}

.search-results-empty {
    text-align: center;
    padding: var(--space-6);
    color: var(--color-text-tertiary);
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.search-result-item:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-soft);
}

.search-result-info {
    flex: 1;
    min-width: 0;
}

.search-result-title {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.search-result-url {
    font-size: var(--font-size-xs);
    color: var(--color-primary);
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: block;
}

.search-result-url:hover {
    text-decoration: underline;
}

.search-result-description {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin-top: var(--space-1);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.search-result-item .btn {
    flex-shrink: 0;
}

/* --- Toast --- */
.toast-container {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.toast {
    background: var(--color-toast-bg);
    color: var(--color-toast-text);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-width: 260px;
    max-width: 420px;
    animation: slideInRight var(--transition-base);
}

.toast.toast-success {
    border-left: 3px solid var(--color-accent);
}

.toast.toast-error {
    border-left: 3px solid var(--color-danger);
}

.toast.toast-info {
    border-left: 3px solid var(--color-primary);
}

.toast-close {
    margin-left: auto;
    background: none;
    border: none;
    color: inherit;
    opacity: 0.6;
    cursor: pointer;
    font-size: var(--font-size-md);
    padding: 0 var(--space-1);
}

.toast-close:hover {
    opacity: 1;
}

/* --- Animations --- */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }

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

/* --- Theme toggle icons --- */
[data-theme="light"] .moon-icon {
    display: none;
}

[data-theme="light"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

/* --- Loading indicator on refresh --- */
.refreshing .logo-icon {
    animation: spin 1s linear infinite;
}

/* --- Responsive --- */
@media (max-width: 900px) {
    .sidebar {
        width: 260px;
        min-width: 260px;
    }

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

@media (max-width: 680px) {
    .sidebar {
        position: fixed;
        left: -320px;
        top: var(--header-height);
        bottom: 0;
        z-index: 90;
        transition: left var(--transition-base);
        box-shadow: var(--shadow-xl);
    }

    .sidebar.open {
        left: 0;
    }

    .header-center {
        margin: 0 var(--space-2);
    }
}