/* ============================================
   IVY'S RSS HUB — Main Stylesheet
   Theme: Dark/Light mode with Ivy Green accent
   ============================================ */

/* === CSS Variables — Dark Theme (Default) === */
:root {
    /* Colors */
    --ivy-green: #10b981;
    --ivy-green-dark: #059669;
    --ivy-green-light: #34d399;

    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    --bg-card: #1e1e1e;
    --bg-hover: #2a2a2a;

    --text-primary: #f5f5f5;
    --text-secondary: #a3a3a3;
    --text-muted: #737373;

    --border-color: #333;
    --border-subtle: #2a2a2a;

    /* Zebra striping for dark theme */
    --zebra-odd: rgba(255, 255, 255, 0.015);

    /* Category Colors */
    --cat-news: #dc2626;
    --cat-ai: #ec4899;
    --cat-tech: #3b82f6;
    --cat-gaming: #8b5cf6;
    --cat-science: #06b6d4;
    --cat-apple: #6b7280;
    --cat-linux: #f59e0b;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);

    /* Spacing */
    --header-height: 60px;
    --content-max-width: 1400px;
    --card-gap: 16px;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", monospace;

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

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Theme indicator */
    --theme-icon: "🌙";
}

/* === Light Theme === */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-tertiary: #e2e8f0;
    --bg-card: #ffffff;
    --bg-hover: #e2e8f0;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;

    --border-color: #cbd5e1;
    --border-subtle: #e2e8f0;

    /* Lighter shadows for light theme */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Zebra striping for light theme */
    --zebra-odd: rgba(0, 0, 0, 0.02);

    /* Theme indicator */
    --theme-icon: "☀️";
}

/* Respect system preference if no manual override */
@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) {
        --bg-primary: #f8fafc;
        --bg-secondary: #f1f5f9;
        --bg-tertiary: #e2e8f0;
        --bg-card: #ffffff;
        --bg-hover: #e2e8f0;

        --text-primary: #0f172a;
        --text-secondary: #475569;
        --text-muted: #64748b;

        --border-color: #cbd5e1;
        --border-subtle: #e2e8f0;

        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
        --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
        --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

        /* Zebra striping for light theme */
        --zebra-odd: rgba(0, 0, 0, 0.02);

        --theme-icon: "☀️";
    }
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

a:hover {
    color: var(--ivy-green-light);
}

/* === Header === */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    height: var(--header-height);
}

.header-content {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    flex-shrink: 0;
}

.logo-icon {
    font-size: 1.5rem;
}

/* === Navigation Categories === */
.nav-categories {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
    flex: 1;
    justify-content: center;
}

.nav-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 4px;
}

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

.nav-btn.active {
    background: var(--ivy-green);
    border-color: var(--ivy-green);
    color: #fff;
}

/* === Header Actions === */
.header-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.btn-icon {
    width: 36px;
    height: 36px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1rem;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.btn-icon.spinning {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* === Main Content === */
.app-layout {
    display: flex;
    flex: 1;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
    gap: 20px;
    padding: 20px;
}

.main-content {
    flex: 1;
    min-width: 0;
}

/* === Status Bar === */
.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    gap: 12px;
    flex-wrap: wrap;
}

.status-time {
    color: var(--text-muted);
}

/* === Language Filter === */
.lang-filter {
    display: flex;
    gap: 4px;
}

.lang-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 4px 10px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.8rem;
    transition: all var(--transition-fast);
}

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

.lang-btn.active {
    background: var(--ivy-green);
    border-color: var(--ivy-green);
    color: #fff;
}

/* === Feeds Container === */
.feeds-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* === Source Section === */
.source-section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.source-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition:
        background var(--transition-fast),
        box-shadow var(--transition-fast);
    /* Subtle left border accent - colored per source */
    border-left: 3px solid var(--source-accent, var(--ivy-green));
}

.source-header:hover {
    background: var(--bg-hover);
}

.source-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    font-weight: 600;
}

.source-icon {
    font-size: 1.25rem;
}

.source-name {
    color: var(--text-primary);
}

.source-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.source-count {
    background: var(--source-accent, var(--ivy-green));
    color: #fff;
    padding: 2px 8px;
    border-radius: 9999px;
    font-weight: 600;
}

.source-status {
    display: flex;
    align-items: center;
    gap: 4px;
}

.source-status.fresh::before {
    content: "";
    width: 6px;
    height: 6px;
    background: var(--ivy-green);
    border-radius: 50%;
}

.source-status.stale::before {
    content: "";
    width: 6px;
    height: 6px;
    background: var(--text-muted);
    border-radius: 50%;
}

.source-toggle {
    font-size: 0.75rem;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

.source-section.collapsed .source-toggle {
    transform: rotate(-90deg);
}

.source-section.collapsed .source-articles {
    display: none;
}

/* === Articles List === */
.source-articles {
    list-style: none;
    /* Responsive max-height: min 400px, prefer 50vh, max 1050px */
    max-height: clamp(400px, 50vh, 1050px);
    overflow-y: auto;
    /* Allow scroll to propagate to parent when reaching bounds */
    overscroll-behavior: auto;
}

.article-item-wrapper {
    display: flex;
    align-items: flex-start;
    border-bottom: 1px solid var(--border-subtle);
    transition: background var(--transition-fast);
}

.article-item-wrapper:last-child {
    border-bottom: none;
}

/* Subtle zebra striping for better visual distinction */
.article-item-wrapper:nth-child(odd) {
    background: var(--zebra-odd, rgba(255, 255, 255, 0.015));
}

.article-item-wrapper:nth-child(even) {
    background: transparent;
}

.article-item-wrapper:hover {
    background: var(--bg-hover);
}

.article-item {
    display: block;
    flex: 1;
    padding: 12px 16px;
    text-decoration: none;
    color: inherit;
}

.article-item:hover .article-title {
    color: var(--ivy-green-light);
}

.article-title {
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.4;
    margin-bottom: 4px;
    transition: color var(--transition-fast);
}

.article-item:hover .article-title {
    color: var(--ivy-green-light);
}

.article-description {
    color: var(--text-muted);
    font-size: 0.8rem;
    line-height: 1.4;
    margin-bottom: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.article-date {
    display: flex;
    align-items: center;
    gap: 4px;
}

.article-source {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--text-muted);
    font-size: 0.75rem;
    padding: 2px 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

/* === New Article Badge === */
.new-badge {
    display: inline-block;
    font-size: 0.6rem;
    font-weight: 700;
    padding: 2px 6px;
    background: var(--ivy-green);
    color: #fff;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-right: 6px;
    vertical-align: middle;
    animation: pulse-badge 2s ease-in-out infinite;
}

@keyframes pulse-badge {
    0%,
    100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* Recent article highlight */
.article-item-wrapper.recent {
    border-left: 2px solid var(--ivy-green);
}

.article-item-wrapper.recent .article-date {
    color: var(--ivy-green);
}

/* === Loading & Empty States === */
.loading-state,
.empty-state,
.error-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--ivy-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

.empty-icon,
.error-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.loading-state .hint,
.empty-state .hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 8px;
    opacity: 0.8;
}

/* === Footer === */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 16px 20px;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.footer .divider {
    margin: 0 8px;
    color: var(--text-muted);
}

/* === Modals === */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    padding: 20px;
}

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

.modal {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 24px;
    max-width: 500px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

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

.modal-large {
    max-width: 700px;
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.modal h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
    color: var(--ivy-green);
}

.modal-section {
    margin-bottom: 20px;
}

.modal-section h3 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 10px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border-subtle);
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 4px 0;
    color: var(--text-secondary);
}

.ivy-quote {
    font-style: italic;
    color: var(--ivy-green);
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-left: 3px solid var(--ivy-green);
    border-radius: var(--radius-sm);
    margin: 20px 0;
}

.copyright {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* === Settings Modal Specific === */
.sources-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 300px;
    overflow-y: auto;
}

.source-toggle-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.source-toggle-item:hover {
    background: var(--bg-hover);
}

.source-toggle-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--ivy-green);
}

.source-toggle-info {
    flex: 1;
    min-width: 0; /* Allow flex child to shrink below content size */
    overflow: hidden;
}

.source-toggle-name {
    font-weight: 500;
    color: var(--text-primary);
}

.source-toggle-url {
    font-size: 0.75rem;
    color: var(--text-muted);
    /* Prevent long URLs from breaking modal layout */
    word-break: break-all;
    overflow-wrap: anywhere;
    max-width: 100%;
    display: block;
}

.source-toggle-category {
    font-size: 0.75rem;
    padding: 2px 8px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
}

/* Add Feed Form */
.add-feed-form {
    display: grid;
    gap: 10px;
}

.add-feed-form input,
.add-feed-form select {
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
}

.add-feed-form input:focus,
.add-feed-form select:focus {
    outline: none;
    border-color: var(--ivy-green);
}

.add-feed-form input::placeholder {
    color: var(--text-muted);
}

.btn-primary {
    background: var(--ivy-green);
    border: none;
    color: #fff;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.btn-primary:hover {
    background: var(--ivy-green-dark);
}

/* Checkbox Labels */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    color: var(--text-secondary);
}

.checkbox-label label {
    cursor: pointer;
    flex: 1;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--ivy-green);
    cursor: pointer;
    flex-shrink: 0;
}

.checkbox-label input[type="number"] {
    width: 60px;
    padding: 4px 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    margin-right: 8px;
}

/* Number input row (for max items) */
.number-input-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 8px 0;
    color: var(--text-secondary);
}

.number-input-row label {
    flex: 1;
}

.number-input-row input[type="number"] {
    width: 70px;
    padding: 6px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    text-align: center;
}

.number-input-row input[type="number"]:focus {
    outline: none;
    border-color: var(--ivy-green);
}

.hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

/* Sources Actions (Enable/Disable All) */
.sources-actions {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.sources-actions .btn-small {
    flex: 1;
}

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

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

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

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

/* === Responsive Design === */
@media (max-width: 900px) {
    .header-content {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 16px;
        gap: 12px;
    }

    .nav-categories {
        order: 3;
        width: 100%;
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 4px;
    }

    .nav-btn {
        flex-shrink: 0;
    }

    .logo-text {
        font-size: 1.1rem;
    }
}

@media (max-width: 600px) {
    .main-content {
        padding: 12px;
    }

    .source-header {
        padding: 10px 12px;
    }

    .article-item {
        padding: 10px 12px;
    }

    .modal {
        padding: 16px;
    }

    .status-bar {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .status-bar .lang-filter {
        order: -1;
    }

    .status-bar .status-text {
        font-size: 0.8rem;
    }
}

/* ============================================
   SIDEBAR STYLES
   ============================================ */

/* === Sidebar Container === */
.sidebar {
    width: 320px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: sticky;
    top: calc(var(--header-height) + 20px);
    max-height: calc(100vh - var(--header-height) - 40px);
    overflow-y: auto;
}

/* === Sidebar Section === */
.sidebar-section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.sidebar-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    margin: 0;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-title.collapsible {
    cursor: pointer;
    transition: background var(--transition-fast);
}

.sidebar-title.collapsible:hover {
    background: var(--bg-hover);
}

.section-toggle {
    font-size: 0.7rem;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

/* Bookmark count badge */
.bookmark-count {
    font-size: 0.75rem;
    color: var(--ivy-green);
    font-weight: 600;
    margin-left: 4px;
}

.sidebar-title.collapsed .section-toggle {
    transform: rotate(-90deg);
}

.section-content {
    padding: 12px;
    max-height: 300px;
    overflow: hidden;
    overflow-y: auto;
    transition:
        max-height var(--transition-normal),
        padding var(--transition-normal),
        opacity var(--transition-normal);
}

.section-content.collapsed {
    max-height: 0;
    padding: 0 12px;
    overflow: hidden;
    opacity: 0;
}

/* === Search Box === */
.search-box {
    display: flex;
    gap: 8px;
    padding: 12px;
}

.search-box input {
    flex: 1;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: border-color var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--ivy-green);
}

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

.search-clear {
    width: 32px;
    height: 32px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-size: 1.1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-clear:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--ivy-green);
}

.search-results {
    padding: 0 12px 12px;
    max-height: 200px;
    overflow-y: auto;
}

.search-hint {
    color: var(--text-muted);
    font-size: 0.8rem;
    font-style: italic;
}

.search-count {
    font-size: 0.75rem;
    color: var(--ivy-green);
    padding: 6px 0;
    margin-bottom: 6px;
    border-bottom: 1px solid var(--border-subtle);
    font-weight: 500;
}

.search-result-item {
    display: block;
    padding: 8px 10px;
    margin-bottom: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.3;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.search-result-item:hover {
    background: var(--bg-hover);
    color: var(--ivy-green-light);
}

.search-result-source {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Search spinner */
.search-spinner {
    display: inline-block;
    width: 12px;
    height: 12px;
    border: 2px solid var(--border-color);
    border-top-color: var(--ivy-green);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 6px;
    vertical-align: middle;
}

/* === Bookmarks === */
.bookmarks-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 10px;
}

.bookmark-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 8px 10px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

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

.bookmark-link {
    flex: 1;
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.3;
    text-decoration: none;
}

.bookmark-link:hover {
    color: var(--ivy-green-light);
}

.bookmark-remove {
    width: 20px;
    height: 20px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.bookmark-remove:hover {
    background: #ef4444;
    color: #fff;
}

.btn-small {
    width: 100%;
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-small:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--ivy-green);
}

.empty-hint {
    color: var(--text-muted);
    font-size: 0.8rem;
    font-style: italic;
    display: block;
    padding: 8px 0;
}

/* === Trending Tags === */
.trending-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.trending-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--tag-color, var(--border-color));
    border-radius: 9999px;
    color: var(--tag-color, var(--text-secondary));
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

/* Trending tag color variations */
.trending-tag:nth-child(12n + 1) {
    --tag-color: #10b981;
} /* Green */
.trending-tag:nth-child(12n + 2) {
    --tag-color: #3b82f6;
} /* Blue */
.trending-tag:nth-child(12n + 3) {
    --tag-color: #8b5cf6;
} /* Purple */
.trending-tag:nth-child(12n + 4) {
    --tag-color: #ec4899;
} /* Pink */
.trending-tag:nth-child(12n + 5) {
    --tag-color: #f59e0b;
} /* Amber */
.trending-tag:nth-child(12n + 6) {
    --tag-color: #06b6d4;
} /* Cyan */
.trending-tag:nth-child(12n + 7) {
    --tag-color: #84cc16;
} /* Lime */
.trending-tag:nth-child(12n + 8) {
    --tag-color: #f97316;
} /* Orange */
.trending-tag:nth-child(12n + 9) {
    --tag-color: #14b8a6;
} /* Teal */
.trending-tag:nth-child(12n + 10) {
    --tag-color: #a855f7;
} /* Violet */
.trending-tag:nth-child(12n + 11) {
    --tag-color: #ef4444;
} /* Red */
.trending-tag:nth-child(12n + 12) {
    --tag-color: #6366f1;
} /* Indigo */

.trending-tag:hover {
    background: var(--tag-color, var(--ivy-green));
    border-color: var(--tag-color, var(--ivy-green));
    color: #fff;
}

.trending-tag:focus {
    outline: 2px solid var(--tag-color, var(--ivy-green));
    outline-offset: 2px;
}

.trending-tag:focus:not(:focus-visible) {
    outline: none;
}

.trending-tag .tag-count {
    font-size: 0.7rem;
    padding: 1px 5px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 9999px;
}

.trending-tag.hot {
    border-color: #ef4444;
    color: #ef4444;
    --tag-color: #ef4444;
}

.trending-tag.hot:hover {
    background: #ef4444;
    color: #fff;
}

/* === Favorite Sources === */
.favorites-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.favorite-source {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.favorite-source:hover {
    background: var(--bg-hover);
}

.favorite-icon {
    font-size: 1rem;
}

.favorite-name {
    flex: 1;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.favorite-count {
    font-size: 0.75rem;
    padding: 2px 6px;
    background: var(--ivy-green);
    color: #fff;
    border-radius: 9999px;
}

.favorite-remove {
    width: 20px;
    height: 20px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.favorite-remove:hover {
    background: #ef4444;
    color: #fff;
}

/* === Calendar === */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
}

.calendar-day {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 6px 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition:
        background var(--transition-fast),
        box-shadow var(--transition-fast),
        transform var(--transition-fast);
    min-height: 60px;
    border: 1px solid transparent;
}

.calendar-day:hover {
    background: var(--bg-hover);
    border-color: var(--border-color);
    transform: translateY(-1px);
}

.calendar-day:focus {
    outline: 2px solid var(--ivy-green);
    outline-offset: 2px;
}

.calendar-day:focus:not(:focus-visible) {
    outline: none;
}

.calendar-day.active {
    background: var(--ivy-green);
}

.calendar-day.active .day-name,
.calendar-day.active .day-date,
.calendar-day.active .day-count {
    color: #fff;
}

.day-name {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
}

.day-date {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 2px 0;
}

.day-count {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--ivy-green);
    padding: 1px 5px;
    background: rgba(16, 185, 129, 0.15);
    border-radius: 9999px;
}

.day-count.zero {
    color: var(--text-muted);
    background: transparent;
}

/* === Sidebar Toggle (Mobile) === */
.sidebar-toggle {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: var(--ivy-green);
    border: none;
    border-radius: 50%;
    font-size: 1.3rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    z-index: 200;
    transition: transform var(--transition-fast);
}

.sidebar-toggle:hover {
    transform: scale(1.1);
}

/* === Back to Top Button === */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 360px; /* Adjusted: sidebar(320) + gap(20) + button offset(20) */
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    font-size: 1.2rem;
    color: var(--text-secondary);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition:
        opacity var(--transition-normal),
        transform var(--transition-normal),
        background var(--transition-fast),
        border-color var(--transition-fast),
        color var(--transition-fast);
    transition-delay: 0s, 0s, 0s, 0s, 0s;
    will-change: opacity, transform;
}

/* Adjust position when sidebar is hidden */
.sidebar.hidden-desktop ~ .back-to-top,
:has(.sidebar.hidden-desktop) .back-to-top {
    right: 20px;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition-delay: 0s;
}

.back-to-top:hover {
    background: var(--ivy-green);
    border-color: var(--ivy-green);
    color: #fff;
    transform: translateY(0) scale(1.1);
}

.back-to-top:focus {
    outline: 2px solid var(--ivy-green);
    outline-offset: 2px;
}

.back-to-top:focus:not(:focus-visible) {
    outline: none;
}

/* Position adjustment when keyboard hint is visible */
@media (min-width: 901px) {
    .back-to-top {
        bottom: 60px; /* Above keyboard hint */
    }
}

/* Mobile/Tablet: position to not overlap sidebar toggle */
@media (max-width: 1100px) {
    .back-to-top {
        right: 80px; /* Left of sidebar toggle */
        bottom: 20px;
    }
}

/* === Article Bookmark Button === */
.article-bookmark {
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    flex-shrink: 0;
    opacity: 0;
    margin: 10px 8px 0 0;
}

.article-item-wrapper:hover .article-bookmark {
    opacity: 1;
}

.article-bookmark:hover {
    color: #fbbf24;
}

.article-bookmark.saved {
    color: #fbbf24;
    opacity: 1;
}

/* === Source Favorite Button === */
.source-favorite {
    width: 28px;
    height: 28px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    margin-right: 8px;
}

.source-favorite:hover {
    border-color: #fbbf24;
    color: #fbbf24;
}

.source-favorite.saved {
    background: #fbbf24;
    border-color: #fbbf24;
    color: #1a1a1a;
}

/* === Responsive Sidebar === */
@media (max-width: 1100px) {
    .sidebar {
        position: fixed;
        top: 0;
        right: -340px;
        width: 320px;
        height: 100vh;
        max-height: 100vh;
        padding: 20px 12px 20px;
        background: var(--bg-secondary);
        border-left: 1px solid var(--border-color);
        z-index: 150;
        transition: right var(--transition-normal);
        will-change: right;
    }

    .sidebar.open {
        right: 0;
    }

    .sidebar-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .app-layout {
        padding: 12px;
    }
}

@media (max-width: 600px) {
    .sidebar {
        width: 100%;
        right: -100%;
    }

    .sidebar.open {
        right: 0;
    }
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */

.toast-notification {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 12px 24px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    opacity: 0;
    transition:
        opacity var(--transition-normal),
        transform var(--transition-normal);
    pointer-events: none;
    will-change: opacity, transform;
}

.toast-notification.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Position adjustment on mobile to avoid sidebar toggle */
@media (max-width: 1100px) {
    .toast-notification {
        bottom: 100px;
    }
}

.toast-success {
    border-color: var(--ivy-green);
    background: rgba(16, 185, 129, 0.15);
}

.toast-error {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.15);
}

.toast-info {
    border-color: #3b82f6;
    background: rgba(59, 130, 246, 0.15);
}

/* ============================================
   SEARCH HIGHLIGHT
   ============================================ */

.search-result-item mark {
    background: rgba(16, 185, 129, 0.3);
    color: var(--ivy-green-light);
    padding: 1px 3px;
    border-radius: 3px;
}

/* ============================================
   KEYBOARD SHORTCUTS HINT
   ============================================ */

.keyboard-hint {
    position: fixed;
    bottom: 20px;
    left: 20px;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    color: var(--text-muted);
    opacity: 0.7;
    z-index: 50;
    transition: opacity var(--transition-fast);
}

.keyboard-hint:hover {
    opacity: 1;
}

.keyboard-hint .divider {
    margin: 0 6px;
    opacity: 0.5;
}

.keyboard-hint kbd {
    display: inline-block;
    padding: 2px 6px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin: 0 2px;
}

@media (max-width: 900px) {
    .keyboard-hint {
        display: none;
    }
}

/* ============================================
   SIDEBAR HIDE TOGGLE (Desktop)
   ============================================ */

.sidebar.hidden-desktop {
    display: none;
}

@media (max-width: 1100px) {
    .sidebar.hidden-desktop {
        display: flex; /* On mobile, use the normal toggle behavior */
    }
}

/* ============================================
   MOBILE SCROLL INDICATOR FOR CATEGORIES
   ============================================ */

@media (max-width: 900px) {
    .nav-categories {
        position: relative;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; /* Firefox */
    }

    .nav-categories::-webkit-scrollbar {
        display: none;
    }

    .nav-categories::after {
        content: "";
        position: absolute;
        right: 0;
        top: 0;
        height: 100%;
        width: 40px;
        background: linear-gradient(to right, transparent, var(--bg-secondary));
        pointer-events: none;
    }
}

/* ============================================
   SOURCE COLOR VARIATIONS (12 subtle colors)
   ============================================ */

/* Color palette - subtle variations that work on dark theme */
.source-section[data-color-index="0"] {
    --source-accent: #10b981;
} /* Ivy Green (default) */
.source-section[data-color-index="1"] {
    --source-accent: #3b82f6;
} /* Blue */
.source-section[data-color-index="2"] {
    --source-accent: #8b5cf6;
} /* Purple */
.source-section[data-color-index="3"] {
    --source-accent: #ec4899;
} /* Pink */
.source-section[data-color-index="4"] {
    --source-accent: #f59e0b;
} /* Amber */
.source-section[data-color-index="5"] {
    --source-accent: #06b6d4;
} /* Cyan */
.source-section[data-color-index="6"] {
    --source-accent: #84cc16;
} /* Lime */
.source-section[data-color-index="7"] {
    --source-accent: #f97316;
} /* Orange */
.source-section[data-color-index="8"] {
    --source-accent: #14b8a6;
} /* Teal */
.source-section[data-color-index="9"] {
    --source-accent: #a855f7;
} /* Violet */
.source-section[data-color-index="10"] {
    --source-accent: #ef4444;
} /* Red */
.source-section[data-color-index="11"] {
    --source-accent: #6366f1;
} /* Indigo */

/* ============================================
   CACHED STATUS INDICATOR
   ============================================ */

.source-status.cached::before {
    content: "";
    width: 6px;
    height: 6px;
    background: #f59e0b;
    border-radius: 50%;
}

/* ============================================
   SETTINGS IMPROVEMENTS
   ============================================ */

/* Add Feed Row (side by side selects) */
.add-feed-row {
    display: flex;
    gap: 8px;
}

.add-feed-row select {
    flex: 1;
}

/* Language indicator in sources list */
.source-toggle-lang {
    font-size: 1rem;
    flex-shrink: 0;
}

/* Custom feed badge */
.custom-badge {
    display: inline-block;
    font-size: 0.65rem;
    padding: 2px 6px;
    background: var(--ivy-green);
    color: #fff;
    border-radius: 9999px;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.02em;
    margin-left: 6px;
    vertical-align: middle;
}

/* Delete custom feed button */
.source-delete-btn {
    width: 28px;
    height: 28px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.9rem;
    opacity: 0.5;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.source-delete-btn:hover {
    opacity: 1;
    background: rgba(239, 68, 68, 0.15);
    border-color: #ef4444;
}

/* Source toggle item improvements */
.source-toggle-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

/* ============================================
   FAILED FEED INDICATOR
   ============================================ */

.source-section.error {
    opacity: 0.6;
    border-color: #ef4444;
}

.source-section.error .source-header {
    border-left-color: #ef4444;
}

.source-status.error::before {
    content: "";
    width: 6px;
    height: 6px;
    background: #ef4444;
    border-radius: 50%;
}

/* ============================================
   FOCUS STATES FOR ACCESSIBILITY
   ============================================ */

.source-header:focus {
    outline: 2px solid var(--ivy-green);
    outline-offset: 2px;
}

.source-header:focus:not(:focus-visible) {
    outline: none;
}

.source-favorite:focus,
.article-bookmark:focus,
.nav-btn:focus,
.lang-btn:focus {
    outline: 2px solid var(--ivy-green);
    outline-offset: 2px;
}

.source-favorite:focus:not(:focus-visible),
.article-bookmark:focus:not(:focus-visible),
.nav-btn:focus:not(:focus-visible),
.lang-btn:focus:not(:focus-visible) {
    outline: none;
}

/* ============================================
   LOADING ANIMATION FOR NEW SECTIONS
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.source-section {
    animation: fadeInUp 0.3s ease-out;
    animation-fill-mode: backwards;
}

/* Stagger animation for multiple sources */
.source-section:nth-child(1) {
    animation-delay: 0ms;
}
.source-section:nth-child(2) {
    animation-delay: 50ms;
}
.source-section:nth-child(3) {
    animation-delay: 100ms;
}
.source-section:nth-child(4) {
    animation-delay: 150ms;
}
.source-section:nth-child(5) {
    animation-delay: 200ms;
}
.source-section:nth-child(6) {
    animation-delay: 250ms;
}
.source-section:nth-child(7) {
    animation-delay: 300ms;
}
.source-section:nth-child(8) {
    animation-delay: 350ms;
}

/* Article items - removed stagger animation for performance with many articles */
/* Only animate first 5 items, rest appear instantly */
.article-item-wrapper:nth-child(-n + 5) {
    animation: fadeInUp 0.15s ease-out;
    animation-fill-mode: backwards;
}

.article-item-wrapper:nth-child(1) {
    animation-delay: 0ms;
}
.article-item-wrapper:nth-child(2) {
    animation-delay: 20ms;
}
.article-item-wrapper:nth-child(3) {
    animation-delay: 40ms;
}
.article-item-wrapper:nth-child(4) {
    animation-delay: 60ms;
}
.article-item-wrapper:nth-child(5) {
    animation-delay: 80ms;
}

/* ============================================
   IMPROVED MOBILE SIDEBAR TOGGLE
   ============================================ */

.sidebar-toggle:active {
    transform: scale(0.95);
}

/* Pulse effect when sidebar has new content */
@keyframes pulse {
    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
    }
}

.sidebar-toggle.has-updates {
    animation: pulse 2s ease-in-out 3;
}

/* ============================================
   SKIP LINK FOR ACCESSIBILITY
   ============================================ */

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--ivy-green);
    color: #fff;
    padding: 8px 16px;
    z-index: 1001;
    transition: top 0.3s ease;
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   AUTO-REFRESH STATUS INDICATOR
   ============================================ */

#auto-refresh-status {
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    text-align: center;
    transition: color var(--transition-fast);
}

#auto-refresh-status:not(:empty) {
    margin-top: 8px;
}