/* ----------------------------------------------------
   DESIGN SYSTEM & CUSTOM PROPERTIES
   ---------------------------------------------------- */
:root {
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-title: 'Outfit', sans-serif;
    
    /* Sleek Dark Cyberpunk/Glassmorphic Theme Colors */
    --bg-main: #0a0b10;
    --bg-sidebar: #0f111a;
    --bg-panel: #141724;
    --bg-card: #1c1f30;
    --bg-card-hover: #24293f;
    --bg-chat-bubble-user: #4f46e5;
    --bg-chat-bubble-ai: #24283b;
    
    --border-color: rgba(255, 255, 255, 0.06);
    --border-color-focus: rgba(99, 102, 241, 0.4);
    
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-inverse: #ffffff;
    
    /* Neon Glow Accents */
    --accent-indigo: #6366f1;
    --accent-indigo-glow: rgba(99, 102, 241, 0.15);
    --accent-amber: #f59e0b;
    --accent-amber-glow: rgba(245, 158, 11, 0.15);
    --accent-emerald: #10b981;
    --accent-emerald-glow: rgba(16, 185, 129, 0.15);
    --accent-rose: #ef4444;
    --accent-rose-glow: rgba(239, 68, 68, 0.15);
    --accent-glance: #475569;
    
    /* Layout Constants */
    --sidebar-width: 280px;
    --list-width: 420px;
    --header-height: 70px;
    
    --primary-color: var(--accent-indigo);
    --glass-blur: blur(20px);
    
    /* Scrollbar Variables */
    --scrollbar-thumb: rgba(255, 255, 255, 0.08);
    --scrollbar-thumb-hover: rgba(255, 255, 255, 0.18);
}

/* ----------------------------------------------------
   GENERAL STYLES & RESET
   ---------------------------------------------------- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-main);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    height: 100dvh;
    width: 100vw;
    -webkit-font-smoothing: antialiased;
}

/* Scrollbars styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
    outline: none;
    transition: all 0.2s ease;
}

input {
    font-family: inherit;
    outline: none;
}

a {
    color: var(--accent-indigo);
    text-decoration: none;
    transition: opacity 0.2s ease;
}
a:hover {
    opacity: 0.8;
}

/* ----------------------------------------------------
   LAYOUT: THREE-COLUMN PANELS
   ---------------------------------------------------- */
#app-layout {
    display: flex;
    height: 100vh;
    height: 100dvh;
    width: 100vw;
    position: relative;
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(245, 158, 11, 0.03) 0px, transparent 50%);
}

.app-panel {
    display: flex;
    flex-direction: column;
    height: 100%;
    border-right: 1px solid var(--border-color);
    background-color: transparent;
    overflow: hidden;
}

.panel-header {
    min-height: var(--header-height);
    padding: 8px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(15, 17, 26, 0.2);
    backdrop-filter: var(--glass-blur);
    z-index: 10;
}

.panel-scroll-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

/* Column 1: Sidebar Feeds Tree */
#feeds-column {
    width: var(--sidebar-width);
    min-width: 180px;
    max-width: 500px;
    flex-shrink: 0;
    background-color: var(--bg-sidebar);
}

/* Column 2: Article Cards List */
#entries-column {
    width: var(--list-width);
    min-width: 250px;
    max-width: 800px;
    flex-shrink: 0;
    background-color: var(--bg-panel);
}

/* Column 3: Article Details View */
#detail-column {
    flex: 1;
    min-width: 300px;
    background-color: rgba(10, 11, 16, 0.3);
    border-right: none;
}

.column-resizer {
    width: 6px;
    cursor: col-resize;
    background-color: transparent;
    z-index: 100;
    position: relative;
    transition: background-color 0.2s;
    margin-left: -3px;
    margin-right: -3px;
}
.column-resizer:hover,
.column-resizer.dragging {
    background-color: var(--accent-indigo);
    box-shadow: 0 0 10px var(--accent-indigo);
}

body.resizing {
    cursor: col-resize !important;
}
body.resizing * {
    cursor: col-resize !important;
    user-select: none !important;
    -webkit-user-select: none !important;
    pointer-events: none !important;
}
body.resizing .column-resizer.dragging {
    pointer-events: auto !important;
}

/* ----------------------------------------------------
   COLUMN 1: LOGO & FEEDS TREE LIST STYLING
   ---------------------------------------------------- */
.logo-container {
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo-icon {
    font-size: 20px;
    animation: pulse 2s infinite alternate;
}
.logo-text {
    font-family: var(--font-title);
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #fff 30%, var(--accent-indigo) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-secondary);
}
.icon-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

/* Quick links styling (unread items shortcut) */
.quick-links {
    margin-bottom: 24px;
}
.quick-link-item {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 12px 16px;
    border-radius: 10px;
    background: rgba(99, 102, 241, 0.04);
    border: 1px solid rgba(99, 102, 241, 0.08);
    color: var(--text-primary);
    font-weight: 500;
    font-size: 14px;
    text-align: left;
}
.quick-link-item:hover, .quick-link-item.active {
    background: var(--accent-indigo);
    border-color: var(--accent-indigo);
    box-shadow: 0 4px 15px var(--accent-indigo-glow);
}
.quick-link-item .item-icon {
    margin-right: 12px;
    font-size: 16px;
}
.quick-link-item .item-text {
    flex: 1;
}

/* Badges styling */
.badge {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}
.quick-link-item.active .badge, .quick-link-item:hover .badge {
    background: rgba(255, 255, 255, 0.2);
}
.unread-badge {
    background: var(--accent-indigo);
    color: var(--text-inverse);
    padding: 2px 7px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
    box-shadow: 0 2px 8px var(--accent-indigo-glow);
}

/* Section labels inside columns */
.section-title-container {
    padding-bottom: 8px;
    margin-bottom: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}
.section-title {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 700;
    color: var(--text-muted);
}

/* Tree feed list styles */
.tree-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

/* Feed item root folder */
.feed-item {
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.2s ease;
}
.feed-row {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
}
.feed-row:hover {
    background: rgba(255, 255, 255, 0.03);
}
.feed-row.active {
    background: rgba(255, 255, 255, 0.05);
    border-left: 3px solid var(--accent-indigo);
}
.feed-row .toggle-icon {
    font-size: 10px;
    width: 14px;
    color: var(--text-muted);
    transition: transform 0.2s ease;
}
.feed-item.expanded .toggle-icon {
    transform: rotate(90deg);
}
.feed-row .feed-icon {
    margin-right: 10px;
    font-size: 16px;
}
.feed-row .feed-title-text {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
}

/* Category child drawer nodes */
.category-children {
    display: none;
    padding-left: 20px;
    margin-top: 2px;
    margin-bottom: 4px;
}
.feed-item.expanded .category-children {
    display: block;
}
.category-row {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
}
.category-row:hover {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-primary);
}
.category-row.active {
    background: rgba(99, 102, 241, 0.08);
    color: var(--accent-indigo);
    font-weight: 500;
}
.category-row .category-icon {
    margin-right: 8px;
    opacity: 0.6;
}
.category-row.active .category-icon {
    opacity: 1;
}
.category-row .category-name-text {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Panel Footer Styles */
.panel-footer {
    height: 60px;
    min-height: 60px;
    padding: 0 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-top: 1px solid var(--border-color);
    background: rgba(10, 11, 16, 0.4);
}
.footer-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex: 1;
    height: 36px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.01);
}
.footer-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}
.footer-btn.icon-only {
    flex: 0 0 36px;
    width: 36px;
    padding: 0;
}

/* ----------------------------------------------------
   COLUMN 2: ARTICLES CARDS LIST STYLING
   ---------------------------------------------------- */
.header-nav {
    display: flex;
    align-items: center;
    gap: 12px;
    overflow: hidden;
}
.title-meta {
    display: flex;
    flex-direction: column;
}
.header-title {
    font-family: var(--font-title);
    font-size: 18px;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.header-subtitle {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
}

/* Toggle unread filter slider button */
.header-filters {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}
.btn-compact {
    width: auto;
    height: 28px;
    padding: 0 12px;
    font-size: 11px;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.btn-compact:hover {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--primary-color);
    color: var(--primary-color);
}
.toggle-container {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.03);
    padding: 6px 12px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}

/* Global Search Bar styling */
.search-bar-wrapper {
    padding: 10px 24px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(15, 17, 26, 0.1);
}
#feeds-column .search-bar-wrapper {
    padding: 10px 16px;
    background: transparent;
}
.feed-row.disabled {
    opacity: 0.45;
}
.search-input-box {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}
.search-input-box input {
    width: 100%;
    height: 32px;
    padding: 0 12px 0 32px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-primary);
    font-size: 12px;
    outline: none;
    transition: all 0.2s ease;
}
.search-input-box input:focus {
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.04);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}
.search-icon {
    position: absolute;
    left: 12px;
    color: var(--text-muted);
    pointer-events: none;
}

.toggle-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}
.switch {
    position: relative;
    display: inline-block;
    width: 28px;
    height: 16px;
}
.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.15);
    transition: .4s;
}
.slider:before {
    position: absolute;
    content: "";
    height: 12px;
    width: 12px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    transition: .4s;
}
input:checked + .slider {
    background-color: var(--accent-indigo);
}
input:checked + .slider:before {
    transform: translateX(12px);
}
.slider.round {
    border-radius: 16px;
}
.slider.round:before {
    border-radius: 50%;
}

/* Entry Cards List Containers */
.card-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* Individual Entry Card Styling */
.entry-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: rgba(28, 31, 48, 0.3);
    cursor: pointer;
    position: relative;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.entry-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 3px;
    background: transparent;
    border-radius: 3px 0 0 3px;
    transition: background 0.2s ease;
}
.entry-card.unread::before {
    background: var(--accent-indigo);
}
.entry-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}
.entry-card.active {
    background: rgba(99, 102, 241, 0.08);
    border-color: rgba(99, 102, 241, 0.25);
    box-shadow: inset 0 0 10px rgba(99, 102, 241, 0.02);
}
.entry-card.active::before {
    background: var(--accent-indigo);
    width: 4px;
}

/* Card Metadata bar */
.card-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
}
.feed-badge {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
}

/* Attention Badge Styling */
.attention-badge {
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 700;
    font-size: 10px;
    text-transform: uppercase;
}
.attention-badge.read {
    color: var(--accent-amber);
    background: rgba(245, 158, 11, 0.08);
    border: 1px solid rgba(245, 158, 11, 0.2);
}
.attention-badge.skim {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}
.attention-badge.glance {
    color: var(--text-secondary);
    background: rgba(71, 85, 105, 0.05);
    border: 1px solid rgba(71, 85, 105, 0.1);
}

/* Unread Indicator Light (Small blue light) */
.unread-indicator-light {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-left: 6px;
    vertical-align: middle;
}

/* Hover effect */
.unread-indicator-light:hover {
    transform: scale(1.3);
    background-color: rgba(99, 102, 241, 0.5);
    box-shadow: 0 0 6px rgba(99, 102, 241, 0.8);
}

/* Glowing Lit state (Unread state) */
.unread-indicator-light.lit {
    background-color: #3b82f6; /* Cyberpunk glowing blue */
    border-color: #60a5fa;
    box-shadow: 0 0 8px #3b82f6, 0 0 16px rgba(59, 130, 246, 0.4);
}

/* Star Indicator Button on Cards */
.star-indicator-btn {
    display: inline-block;
    color: rgba(255, 255, 255, 0.15);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    margin-left: 6px;
    vertical-align: middle;
    font-size: 14px;
    line-height: 1;
}

.star-indicator-btn:hover {
    transform: scale(1.3);
    color: rgba(234, 179, 8, 0.7); /* Gold hover */
}

.star-indicator-btn.starred {
    color: #eab308; /* Solid gold */
    text-shadow: 0 0 6px rgba(234, 179, 8, 0.5);
}

/* Star button inside detail article actions */
#art-toggle-star-btn.starred {
    color: #eab308;
}
#art-toggle-star-btn.starred:hover {
    color: #f59e0b;
}

/* Title text */
.entry-card .card-title {
    font-size: 14px;
    font-weight: 500;
    line-height: 1.4;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.entry-card.unread .card-title {
    color: var(--text-primary);
    font-weight: 600;
}

/* Card bottom description hint */
.card-desc {
    font-size: 12px;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Indicator badges (no text/video icon indicators) */
.card-indicators {
    display: flex;
    gap: 4px;
    margin-left: auto;
}
.indicator-icon {
    font-size: 12px;
    opacity: 0.6;
}

/* Empty states */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    text-align: center;
    color: var(--text-muted);
}
.empty-icon {
    font-size: 40px;
    margin-bottom: 16px;
    animation: float 4s infinite ease-in-out;
}
.empty-state h3 {
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}
.empty-state p {
    font-size: 12px;
    max-width: 260px;
    line-height: 1.5;
}

/* ----------------------------------------------------
   COLUMN 3: DETAIL VIEW & CHAT STYLING
   ---------------------------------------------------- */
.detail-layout {
    display: flex;
    flex-direction: row;
    height: 100%;
    overflow: hidden;
    position: relative;
}

.article-scroll-view {
    flex: 1;
    overflow-y: auto;
    padding: 30px;
}

.article-body {
    max-width: 700px;
    margin: 0 auto;
}

/* Article Header */
.article-header {
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}
.article-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 12px;
    color: var(--text-secondary);
}
.badge-accent {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-indigo);
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
}
.art-title {
    font-family: var(--font-title);
    font-size: 26px;
    line-height: 1.35;
    font-weight: 700;
    margin-bottom: 16px;
}
.art-title a {
    color: var(--text-inverse);
    text-decoration: none;
    transition: color 0.2s ease, text-decoration 0.2s ease;
}
.art-title a:hover {
    color: var(--primary-color);
    text-decoration: underline;
    text-underline-offset: 4px;
}
.article-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}
.attention-selector-wrapper {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.attention-selector-wrapper .actions-label {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-muted);
}
.attention-btn-group {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2px;
    gap: 2px;
}
.attn-badge-btn {
    background: none;
    border: 1px solid transparent;
    padding: 3px 8px;
    font-size: 10px;
    font-weight: 700;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.attn-badge-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}
.attn-badge-btn.active.read {
    color: var(--accent-amber);
    background: rgba(245, 158, 11, 0.08);
    border-color: rgba(245, 158, 11, 0.3);
    box-shadow: 0 0 6px rgba(245, 158, 11, 0.1);
}
.attn-badge-btn.active.skim {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.15);
}
.attn-badge-btn.active.glance {
    color: var(--text-secondary);
    background: rgba(71, 85, 105, 0.05);
    border-color: rgba(71, 85, 105, 0.15);
}
.action-divider {
    width: 1px;
    height: 14px;
    background-color: var(--border-color);
}
.text-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}
.text-btn:hover {
    color: var(--text-inverse);
}

/* AI Summary Block */
.ai-box {
    margin-bottom: 24px;
    border-radius: 16px;
    border: 1px solid rgba(99, 102, 241, 0.15);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.02) 0%, rgba(15, 17, 26, 0.2) 100%);
    backdrop-filter: var(--glass-blur);
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}
.ai-box-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid rgba(99, 102, 241, 0.1);
    background: rgba(99, 102, 241, 0.03);
}
.ai-title-tag {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-title);
    font-weight: 700;
    font-size: 14px;
    color: var(--text-primary);
}
.sparkle-icon {
    animation: spin-glow 3s infinite linear;
}
.status-indicator {
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
}
.status-indicator.loading {
    color: var(--accent-amber);
    background: rgba(245, 158, 11, 0.08);
}
.status-indicator.ready {
    color: var(--accent-emerald);
    background: rgba(16, 185, 129, 0.08);
}

.ai-box-body {
    padding: 20px;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
}
.ai-box-body p {
    margin-bottom: 14px;
}
.ai-box-body p:last-child {
    margin-bottom: 0;
}
.ai-box-body ul {
    list-style-type: none;
    margin-bottom: 14px;
}
.ai-box-body li {
    position: relative;
    padding-left: 18px;
    margin-bottom: 10px;
}
.ai-box-body li::before {
    content: "✦";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--accent-indigo);
    font-size: 12px;
}
.ai-box-body ol {
    list-style-type: decimal;
    padding-left: 20px;
    margin-bottom: 14px;
}
.ai-box-body ol li {
    padding-left: 5px;
    margin-bottom: 10px;
}
.ai-box-body ol li::before {
    content: none;
}
.ai-box-body strong {
    color: var(--accent-indigo);
    font-weight: 600;
}

/* Clickbait Banner warnings */
.alert-banner {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin: 16px 20px 0 20px;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 12px;
    line-height: 1.5;
}
.alert-banner.warning {
    background: rgba(239, 68, 68, 0.06);
    border: 1px solid rgba(239, 68, 68, 0.15);
    color: #fca5a5;
}
.alert-icon {
    font-size: 16px;
}

/* Fulltext toggler and scroll details */
.fulltext-expander-section {
    margin-top: 30px;
}
.action-btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    height: 40px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
    font-size: 13px;
    font-weight: 500;
}
.action-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
}

.fulltext-body {
    margin-top: 20px;
    font-size: 16px;
    line-height: 1.85;
    color: var(--text-primary);
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
    letter-spacing: 0.02em;
}
.fulltext-body p {
    margin-bottom: 20px;
    text-align: justify;
    text-justify: inter-character;
}
.fulltext-body strong {
    color: var(--text-inverse);
    font-weight: 600;
}
.fulltext-body a {
    color: var(--primary-color);
    text-decoration: underline;
    text-underline-offset: 4px;
}
.fulltext-body a:hover {
    color: var(--accent-indigo);
}

/* Right-hand side Chat Column (Drawer overlay by default) */
#chat-section {
    position: absolute;
    top: 0;
    right: -420px; /* Hidden off-screen by default */
    width: 380px;
    height: 100%;
    border-left: 1px solid var(--border-color);
    background: rgba(20, 23, 36, 0.85); /* Darker glass for readability overlay */
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    display: flex;
    flex-direction: column;
    z-index: 150;
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.25);
}
#chat-section.open {
    right: 0;
}

.chat-header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
}

.close-drawer-btn {
    font-size: 26px;
    line-height: 1;
    padding: 0 4px;
    color: var(--text-secondary);
    cursor: pointer;
    background: transparent;
    border: none;
    transition: color 0.2s ease, transform 0.2s ease;
}
.close-drawer-btn:hover {
    color: var(--accent-indigo);
    transform: scale(1.1);
}

/* Floating AI Action Button */
.floating-ai-btn {
    position: absolute;
    bottom: 30px;
    right: 30px;
    z-index: 120;
    background: linear-gradient(135deg, var(--accent-indigo) 0%, #4f46e5 100%);
    color: var(--text-inverse);
    padding: 12px 20px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.1);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.floating-ai-btn:hover {
    transform: translateY(-2px) scale(1.03);
    box-shadow: 0 6px 24px rgba(99, 102, 241, 0.6);
}
.floating-ai-btn:active {
    transform: translateY(0) scale(0.98);
}

/* Slide/fade the FAB away when drawer is open */
#detail-column.chat-open .floating-ai-btn {
    opacity: 0;
    transform: scale(0.8) translateY(20px);
    pointer-events: none;
}
.chat-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}
.chat-header h3 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 4px;
}
.chat-desc {
    font-size: 11px;
    color: var(--text-muted);
}

.chat-messages-view {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.system-message {
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.01);
    border-radius: 8px;
    border: 1px dashed var(--border-color);
}

/* Chat bubble dialogue bubbles */
.chat-bubble {
    display: flex;
    flex-direction: column;
    max-width: 85%;
    padding: 12px 16px;
    border-radius: 14px;
    font-size: 13px;
    line-height: 1.5;
    word-break: break-word;
}
.chat-bubble.user {
    align-self: flex-end;
    background-color: var(--bg-chat-bubble-user);
    color: var(--text-inverse);
    border-bottom-right-radius: 2px;
    box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3);
}
.chat-bubble.assistant {
    align-self: flex-start;
    background-color: var(--bg-chat-bubble-ai);
    color: var(--text-primary);
    border-bottom-left-radius: 2px;
    border: 1px solid var(--border-color);
}
.bubble-meta {
    font-size: 9px;
    color: rgba(255, 255, 255, 0.5);
    margin-top: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.chat-bubble.assistant .bubble-meta {
    color: var(--text-muted);
}
.delete-msg-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 9px;
    padding: 0;
    text-decoration: underline;
    transition: color 0.2s ease;
    margin-left: 8px;
}
.delete-msg-btn:hover {
    color: var(--accent-rose);
}

/* Markdown elements style under fulltext-body */
.fulltext-body ul, .fulltext-body ol {
    margin-top: 10px;
    margin-bottom: 20px;
    padding-left: 24px;
}
.fulltext-body li {
    margin-bottom: 8px;
    line-height: 1.7;
    list-style-position: outside;
}
.fulltext-body blockquote {
    border-left: 4px solid var(--accent-indigo);
    background: rgba(255, 255, 255, 0.02);
    padding: 12px 16px;
    margin: 20px 0;
    border-radius: 0 8px 8px 0;
    color: var(--text-secondary);
    font-style: italic;
}
.fulltext-body code {
    background-color: rgba(255, 255, 255, 0.08);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9em;
    color: #ff79c6; /* Cyberpunk soft pink */
}

/* Input typing field at the bottom of the chat */
.chat-input-area {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    background: rgba(10, 11, 16, 0.5);
    display: flex;
    align-items: center; /* Align items vertically centered */
    gap: 8px;
}
.chat-input-area input {
    flex: 1;
    height: 42px; /* Increased from 38px for better styling & mobile touch */
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.2);
    color: var(--text-primary);
    padding: 0 14px;
    font-size: 14px; /* Slightly larger for readability */
    transition: all 0.2s ease;
}
.chat-input-area input:focus {
    border-color: var(--accent-indigo);
    box-shadow: 0 0 8px rgba(99, 102, 241, 0.15);
}
.chat-input-area input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}
.chat-submit-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px; /* Increased from 38px */
    height: 42px; /* Increased from 38px */
    border-radius: 8px;
    background-color: var(--accent-indigo);
    color: var(--text-inverse);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}
.chat-submit-btn:hover:not(:disabled) {
    background-color: #4f46e5;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
    transform: translateY(-1px);
}
.chat-submit-btn:active:not(:disabled) {
    transform: translateY(0);
}
.chat-submit-btn:disabled {
    background-color: var(--border-color);
    color: var(--text-muted);
    opacity: 0.5;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

/* Detail empty selection state styling */
.empty-state-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.glowing-orb {
    position: absolute;
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, transparent 70%);
    top: 45%;
    left: 50%;
    transform: translate(-50%, -50%);
    filter: blur(20px);
}
.empty-state-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.wireframe-graphic {
    margin-bottom: 24px;
    opacity: 0.8;
}
.empty-state-content h3 {
    font-family: var(--font-title);
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}
.empty-state-content p {
    font-size: 13px;
    color: var(--text-muted);
    max-width: 300px;
    line-height: 1.5;
}

/* ----------------------------------------------------
   MODALS POPUPS STYLING
   ---------------------------------------------------- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(6, 8, 14, 0.65);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 1;
    transition: opacity 0.3s ease;
}
.modal-overlay.hidden {
    display: none !important;
    opacity: 0;
}

.modal-container {
    width: 100%;
    max-width: 440px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(20, 23, 36, 0.7);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    overflow: hidden;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}
.modal-header h3 {
    font-family: var(--font-title);
    font-size: 16px;
    font-weight: 700;
}
.close-modal-btn {
    font-size: 20px;
    color: var(--text-muted);
}
.close-modal-btn:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 24px 20px;
}
.modal-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.5;
}

.input-group input {
    width: 100%;
    height: 40px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-primary);
    padding: 0 12px;
    font-size: 14px;
}
.input-group input:focus {
    border-color: var(--accent-indigo);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.2);
}

/* File Upload drag-and-drop boxes */
.file-upload-box {
    margin-top: 10px;
}
.drop-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    height: 140px;
    border: 2px dashed rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.2);
    cursor: pointer;
    transition: all 0.2s ease;
}
.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--accent-indigo);
    background: rgba(99, 102, 241, 0.02);
}
.upload-icon {
    color: var(--text-muted);
}
.drop-zone:hover .upload-icon, .drop-zone.dragover .upload-icon {
    color: var(--accent-indigo);
}
#file-upload-label {
    font-size: 12px;
    color: var(--text-secondary);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    background: rgba(10, 11, 16, 0.3);
}

.modal-btn {
    height: 36px;
    padding: 0 16px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
}
.modal-btn.primary {
    background-color: var(--accent-indigo);
    color: var(--text-inverse);
}
.modal-btn.primary:hover:not(:disabled) {
    background-color: #4f46e5;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}
.modal-btn.primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.modal-btn.secondary {
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}
.modal-btn.secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

/* ----------------------------------------------------
   UTILITIES & ANIMATIONS
   ---------------------------------------------------- */
.hidden {
    display: none !important;
}

.loading-placeholder {
    font-size: 13px;
    color: var(--text-muted);
    text-align: center;
    padding: 20px;
}

.mobile-only {
    display: none !important;
}

/* Animations */
@keyframes pulse {
    0% { transform: scale(1); opacity: 0.8; }
    100% { transform: scale(1.08); opacity: 1; }
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
    100% { transform: translateY(0px); }
}

@keyframes spin-glow {
    0% { transform: rotate(0deg); filter: drop-shadow(0 0 1px rgba(99, 102, 241, 0.4)); }
    50% { filter: drop-shadow(0 0 6px rgba(99, 102, 241, 0.8)); }
    100% { transform: rotate(360deg); filter: drop-shadow(0 0 1px rgba(99, 102, 241, 0.4)); }
}

.spinning {
    animation: spin 1s infinite linear;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ----------------------------------------------------
   RESPONSIVE DESIGN (MOBILE & NARROW SCREEN ADAPTATIONS)
   ---------------------------------------------------- */
/* On narrow desktop screens (up to 1250px) and mobile, the AI Chat slides up from the bottom as a bottom sheet drawer */
@media (max-width: 1250px) {
    #chat-section {
        right: 0 !important;
        left: 0 !important;
        top: auto !important;
        bottom: -100% !important; /* Hide below viewport */
        width: 100% !important;
        min-width: 100% !important;
        height: 75% !important; /* Drawer occupies 75% height */
        border-left: none !important;
        border-top: 1px solid var(--border-color) !important;
        box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.35) !important;
        transition: bottom 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    }
    
    #chat-section.open {
        bottom: 0 !important;
    }
    
    .floating-ai-btn {
        bottom: calc(50px + env(safe-area-inset-bottom)) !important;
        right: 18px !important;
        width: 44px !important;
        height: 44px !important;
        border-radius: 50% !important;
        padding: 0 !important;
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35) !important;
    }
    .floating-ai-btn .btn-text {
        display: none !important;
    }
    .floating-ai-btn svg {
        margin: 0 !important;
        width: 20px !important;
        height: 20px !important;
    }
    .chat-input-area input {
        font-size: 16px !important; /* Prevent iOS auto-zoom on input focus */
    }
}

@media (min-width: 901px) and (max-width: 1100px) {
    #feeds-column {
        width: 70px;
        min-width: 70px;
        padding: 0;
    }
    #feeds-column .logo-text,
    #feeds-column .footer-btn,
    #feeds-column .quick-link-item .item-text,
    #feeds-column .feed-title-text,
    #feeds-column .category-children,
    #feeds-column .toggle-icon,
    #feeds-column .section-title-container {
        display: none !important;
    }
    #feeds-column .quick-link-item .item-icon {
        margin: 0;
        font-size: 20px;
    }
    #feeds-column .feed-row .feed-icon {
        margin: 0;
        font-size: 20px;
    }
    #feeds-column .quick-link-item,
    #feeds-column .feed-row {
        justify-content: center;
        padding: 12px 0;
    }
    #feeds-column .panel-header {
        justify-content: center;
        padding: 0;
    }
    #feeds-column #add-feed-btn {
        display: none !important;
    }
    #feeds-column .panel-footer {
        flex-direction: column;
        height: auto;
        padding: 10px 0;
    }
    #feeds-column #opml-import-btn {
        display: none !important;
    }
    #feeds-column #refresh-all-btn {
        width: 36px;
    }
}

@media (max-width: 900px) {
    .mobile-only {
        display: flex !important;
    }
    
    #app-layout {
        width: 100vw;
        overflow: hidden;
        /* Force WebKit 3D rendering context to resolve backdrop-filter and layer transparency bugs */
        transform-style: preserve-3d;
        -webkit-transform-style: preserve-3d;
    }
    
    /* Panels collapse to single column navigation */
    .app-panel {
        width: 100% !important;
        min-width: 100% !important;
        position: absolute;
        top: 0;
        left: 0;
        height: 100%;
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 1;
    }
    
    /* Fix scrolling cutoff at the bottom by dynamic mobile browser navigation bars */
    .panel-scroll-content {
        padding-bottom: 90px !important;
    }
    .article-scroll-view {
        padding-bottom: 120px !important; /* Extra bottom padding to scroll past floating FAB and bottom bar */
        /* Move background-color and backdrop-filter here to fix WebKit GPU hardware-acceleration transform blur bug */
        background-color: rgba(10, 11, 16, 0.4) !important;
        backdrop-filter: blur(20px) !important;
        -webkit-backdrop-filter: blur(20px) !important;
    }
    
    .panel-header.mobile-only {
        background-color: rgba(10, 11, 16, 0.4) !important;
        backdrop-filter: blur(20px) !important;
        -webkit-backdrop-filter: blur(20px) !important;
    }
    
    /* Active navigation screens using 3D transforms to force GPU compositing layer blending */
    #feeds-column {
        transform: translate3d(0, 0, 0);
        z-index: 5;
    }
    #entries-column {
        transform: translate3d(100%, 0, 0);
        z-index: 10;
    }
    #detail-column {
        transform: translate3d(100%, 0, 0);
        z-index: 15;
        background-color: transparent !important;
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
    }
    
    /* Body state-driven navigation */
    body.show-entries #entries-column {
        transform: translate3d(0, 0, 0);
    }
    body.show-entries #feeds-column {
        transform: translate3d(-30%, 0, 0);
    }
    
    body.show-detail #detail-column {
        transform: translate3d(0, 0, 0);
    }
    body.show-detail #entries-column {
        transform: translate3d(-30%, 0, 0);
    }
    
    .column-resizer {
        display: none !important;
    }
    .article-actions {
        flex-wrap: wrap;
        gap: 12px;
    }
    .action-divider {
        display: none !important;
    }
    .ai-box-header {
        flex-wrap: wrap;
        gap: 8px 16px;
    }
    #summary-meta-info {
        order: 3;
        width: 100%;
        text-align: left !important;
        padding-right: 0 !important;
        margin-left: 0 !important;
        margin-top: 4px;
    }
    .art-title {
        font-size: 20px !important;
        margin-bottom: 12px;
    }
}

.article-image {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 16px auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.fulltext-body h2, .fulltext-body h3, .fulltext-body h4 {
    color: var(--text-inverse);
    margin-top: 32px;
    margin-bottom: 12px;
    font-weight: 700;
    line-height: 1.4;
}
.fulltext-body h2 { font-size: 20px; }
.fulltext-body h3 { font-size: 18px; }
.fulltext-body h4 { font-size: 16px; }

/* FEED MANAGEMENT LIST STYLING */
.manage-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.manage-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 8px;
    transition: all 0.2s ease;
}
.manage-item:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.08);
}
.manage-item.disabled {
    opacity: 0.5;
}
.manage-item-title-input {
    flex-grow: 1;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 6px;
    padding: 6px 10px;
    color: var(--text-primary);
    font-size: 13px;
    font-family: inherit;
    transition: border-color 0.2s;
}
.manage-item-title-input:focus {
    border-color: var(--accent-color, #6366f1);
    outline: none;
    background: rgba(0, 0, 0, 0.4);
}
.manage-item-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}
.feed-switch {
    position: relative;
    display: inline-block;
    width: 38px;
    height: 20px;
}
.feed-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.feed-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.1);
    transition: .3s;
    border-radius: 20px;
}
.feed-slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
}
.feed-enabled-toggle:checked + .feed-slider {
    background-color: #10b981;
}
.feed-classify-toggle:checked + .feed-slider {
    background-color: var(--accent-indigo, #6366f1);
}
input:checked + .feed-slider:before {
    transform: translateX(18px);
}
.delete-feed-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.delete-feed-btn:hover {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}
.reset-feed-categories-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.reset-feed-categories-btn:hover {
    color: #f59e0b;
    background: rgba(245, 158, 11, 0.1);
}

/* System Settings Tab & Styling */
.modal-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-top: 8px;
}
.tab-btn {
    border-bottom: 2px solid transparent;
    color: var(--text-muted) !important;
    transition: all 0.2s ease;
}
.tab-btn:hover:not(.active) {
    color: var(--text-primary) !important;
}
.tab-btn.active {
    color: var(--text-primary) !important;
    border-bottom-color: var(--accent-color, #6366f1) !important;
}
.tab-content.hidden {
    display: none !important;
}
.settings-group {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 8px;
    padding: 14px 16px;
}
.form-input {
    transition: border-color 0.2s, background 0.2s;
}
.form-input:focus {
    border-color: var(--accent-color, #6366f1) !important;
    background: rgba(0, 0, 0, 0.4) !important;
    outline: none;
}

/* ----------------------------------------------------
   UNDO MARKS AS READ TOAST
   ---------------------------------------------------- */
.undo-toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: rgba(20, 23, 36, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(99, 102, 241, 0.25);
    border-radius: 12px;
    padding: 12px 20px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 0 20px rgba(99, 102, 241, 0.15);
    display: flex;
    align-items: center;
    gap: 16px;
    z-index: 9999;
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s ease;
    pointer-events: none;
}
.undo-toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    pointer-events: auto;
}
.undo-toast-text {
    font-size: 13.5px;
    color: var(--text-primary);
    font-weight: 500;
}
.undo-toast-btn {
    background: var(--accent-indigo);
    color: #ffffff;
    font-size: 12px;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    border: none;
    outline: none;
}
.undo-toast-btn:hover {
    background: #4f46e5;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.45);
    transform: translateY(-1px);
}
.undo-toast-btn:active {
    transform: translateY(0);
}
.undo-toast-progress-container {
    position: relative;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.undo-toast-progress-svg {
    transform: rotate(-90deg);
    width: 24px;
    height: 24px;
}
.undo-toast-progress-circle-bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.1);
    stroke-width: 2.5;
}
.undo-toast-progress-circle {
    fill: none;
    stroke: var(--accent-indigo);
    stroke-width: 2.5;
    stroke-dasharray: 63; /* 2 * PI * r = 2 * 3.14 * 10 = 62.8 */
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 5s linear;
}

@media (max-width: 600px) {
    .manage-item {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }
    .manage-item-title-input {
        width: 100%;
    }
    .manage-item-actions {
        justify-content: flex-end;
    }
}

/* ----------------------------------------------------
   LIGHT THEME STYLES & OVERRIDES
   ---------------------------------------------------- */
body.light-theme {
    /* 温润护眼的 Light Theme Colors */
    --bg-main: #f5f7f9;          /* 轻柔微蓝灰，避免死板暗灰色 */
    --bg-sidebar: #ebedf0;       /* 偏透亮的左侧侧边栏 */
    --bg-panel: #fafafc;         /* 降低亮度的柔白色背景，大幅减轻视觉疲劳 */
    --bg-card: #ffffff;          /* 列表卡片使用白底，提供清晰的视觉重心 */
    --bg-card-hover: #f0f2f5;    /* 卡片 hover 时底色 */
    --bg-chat-bubble-user: #4f46e5;
    --bg-chat-bubble-ai: #eaedf1;
    
    --border-color: rgba(0, 0, 0, 0.07);
    --border-color-focus: rgba(99, 102, 241, 0.45);
    
    --text-primary: #1e293b;     /* 更清晰深邃的 slate 蓝灰字（代替刺眼的纯黑） */
    --text-secondary: #3b4252;   /* 次级标题/摘要字颜色，确保可读性 */
    --text-muted: #718096;       /* 辅助提示/元数据字调深，彻底解决浅色下字太淡看不清的问题 */
    --text-inverse: #ffffff;
    
    /* Neon Glow Accents for Light Theme */
    --accent-indigo-glow: rgba(99, 102, 241, 0.06);
    --accent-amber-glow: rgba(245, 158, 11, 0.06);
    --accent-emerald-glow: rgba(16, 185, 129, 0.06);
    --accent-rose-glow: rgba(239, 68, 68, 0.06);
    
    --scrollbar-thumb: rgba(0, 0, 0, 0.12);
    --scrollbar-thumb-hover: rgba(0, 0, 0, 0.22);
}

/* Light Theme Component Overrides */
body.light-theme .app-panel {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.03);
}

body.light-theme .entry-card {
    background: var(--bg-card);
    border: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
}

body.light-theme .entry-card:hover {
    border-color: rgba(99, 102, 241, 0.15);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.05);
}

body.light-theme .entry-card.active {
    background: rgba(99, 102, 241, 0.05);
    border-color: var(--accent-indigo);
}

body.light-theme .search-input-box input {
    background: rgba(0, 0, 0, 0.03);
}

body.light-theme .search-input-box input:focus {
    background: #ffffff;
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.1);
}

body.light-theme .ai-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.02) 0%, rgba(0, 0, 0, 0.01) 100%);
    border-color: rgba(99, 102, 241, 0.12);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

body.light-theme #ai-summary-block {
    background: rgba(99, 102, 241, 0.02);
}

body.light-theme .fulltext-expander-section button {
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

body.light-theme .fulltext-expander-section button:hover {
    background: rgba(0, 0, 0, 0.04);
}

body.light-theme .chat-input-area {
    background: rgba(255, 255, 255, 0.8);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

body.light-theme .chat-input-area input {
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.06);
}

body.light-theme .chat-input-area input:focus {
    background: #ffffff;
    border-color: var(--accent-indigo);
    box-shadow: 0 0 8px rgba(99, 102, 241, 0.1);
}

body.light-theme .manage-item {
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

body.light-theme .manage-item:hover {
    background: rgba(0, 0, 0, 0.03);
    border-color: rgba(0, 0, 0, 0.08);
}

body.light-theme .manage-item-title-input {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(0, 0, 0, 0.08);
}

body.light-theme .manage-item-title-input:focus {
    background: #ffffff;
    border-color: var(--accent-indigo);
}

body.light-theme .settings-group {
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

body.light-theme .form-input {
    background: #ffffff;
    border: 1px solid rgba(0, 0, 0, 0.12);
    color: var(--text-primary);
}

body.light-theme .form-input:focus {
    background: #ffffff !important;
}

body.light-theme .glass {
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

body.light-theme .undo-toast {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(99, 102, 241, 0.15);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

body.light-theme .column-resizer {
    background: rgba(0, 0, 0, 0.04);
}

body.light-theme .column-resizer:hover,
body.light-theme .column-resizer.resizing {
    background: var(--accent-indigo);
}

body.light-theme .section-title-container {
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

body.light-theme .badge {
    background: rgba(0, 0, 0, 0.05);
}

body.light-theme .quick-link-item.active .badge,
body.light-theme .quick-link-item:hover .badge {
    background: rgba(0, 0, 0, 0.08);
}

/* Fix Light Theme Detail Column background and text visibility bugs */
body.light-theme #detail-column {
    background-color: #ffffff;
}

body.light-theme .article-scroll-view {
    background-color: #ffffff !important;
}

body.light-theme #chat-section {
    background: rgba(255, 255, 255, 0.95);
    border-left: 1px solid var(--border-color);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.05);
}

body.light-theme .art-title a {
    color: var(--text-primary);
}

body.light-theme .art-title a:hover {
    color: var(--primary-color);
}

body.light-theme .fulltext-body strong {
    color: #0f172a; /* Slate 900 for extra bold emphasis */
}

body.light-theme .fulltext-body h2,
body.light-theme .fulltext-body h3,
body.light-theme .fulltext-body h4 {
    color: var(--text-primary);
}

body.light-theme .system-message {
    background: rgba(0, 0, 0, 0.01);
    border-color: var(--border-color);
}

body.light-theme .attn-badge-btn:hover {
    background: rgba(0, 0, 0, 0.04);
}

body.light-theme .attn-badge-btn.active.skim {
    background: rgba(99, 102, 241, 0.06);
    border-color: rgba(99, 102, 241, 0.25);
    color: var(--accent-indigo);
}

body.light-theme .logo-text {
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-indigo) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Settings Switch / Slider Color Fixes */
.feed-switch input:checked + .feed-slider {
    background-color: var(--accent-indigo, #6366f1) !important;
}

.feed-switch input.feed-enabled-toggle:checked + .feed-slider {
    background-color: #10b981 !important;
}

body.light-theme .feed-slider {
    background-color: rgba(0, 0, 0, 0.15) !important;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

body.light-theme .feed-switch input.feed-classify-toggle:checked + .feed-slider {
    background-color: var(--accent-indigo, #6366f1) !important;
}

body.light-theme .feed-switch input.feed-enabled-toggle:checked + .feed-slider {
    background-color: #10b981 !important;
}

/* System settings font size overrides */
#manage-feeds-modal h3 {
    font-size: 18px !important;
}
#manage-feeds-modal .tab-btn {
    font-size: 14.5px !important;
}
#manage-feeds-modal .modal-desc {
    font-size: 14px !important;
}
#manage-feeds-modal .modal-btn {
    font-size: 14px !important;
}
#manage-feeds-modal .manage-item-title-input {
    font-size: 14px !important;
}
#manage-feeds-modal .form-label {
    font-size: 14.5px !important;
}
#manage-feeds-modal .form-input,
#manage-feeds-modal .form-input option,
#manage-feeds-modal select,
#manage-feeds-modal select option {
    font-size: 15px !important;
    height: 40px !important;
}
#manage-feeds-modal .group-title {
    font-size: 15px !important;
}
#manage-feeds-modal span[style*="font-size: 12px"] {
    font-size: 15px !important;
}
#manage-feeds-modal span[style*="font-size: 10px"] {
    font-size: 13px !important;
}
#manage-feeds-modal span[style*="font-size: 11px"] {
    font-size: 13.5px !important;
}
#manage-feeds-modal button {
    font-size: 13px !important;
}

/* Responsive/adaptive font sizing for larger screens */
@media (min-width: 1200px) {
    /* Sidebar */
    .quick-link-item,
    .tree-list,
    .feed-row,
    .category-row,
    .section-title {
        font-size: 13.5px !important;
    }
    
    /* Entries list */
    .entry-card .card-title {
        font-size: 14.5px !important;
    }
    .card-desc {
        font-size: 12.5px !important;
    }
    .panel-header .header-title {
        font-size: 17px !important;
    }
    
    /* Article reading */
    .art-title {
        font-size: 28px !important;
    }
    .fulltext-body {
        font-size: 17px !important;
    }
    .ai-box-body {
        font-size: 15px !important;
    }
    .chat-bubble {
        font-size: 14px !important;
    }
    .chat-desc {
        font-size: 12px !important;
    }
    .system-message {
        font-size: 13px !important;
    }
    .text-btn {
        font-size: 13px !important;
    }
    .actions-label {
        font-size: 12px !important;
    }
    .attn-badge-btn {
        font-size: 11px !important;
    }
}

@media (min-width: 1600px) {
    /* Sidebar */
    .quick-link-item,
    .tree-list,
    .feed-row,
    .category-row,
    .section-title {
        font-size: 14px !important;
    }
    
    /* Entries list */
    .entry-card .card-title {
        font-size: 15px !important;
    }
    .card-desc {
        font-size: 13px !important;
    }
    .panel-header .header-title {
        font-size: 18px !important;
    }
    
    /* Article reading */
    .art-title {
        font-size: 30px !important;
    }
    .fulltext-body {
        font-size: 18px !important;
    }
    .ai-box-body {
        font-size: 16px !important;
    }
    .chat-bubble {
        font-size: 14.5px !important;
    }
    .chat-desc {
        font-size: 12.5px !important;
    }
    .system-message {
        font-size: 13.5px !important;
    }
    .text-btn {
        font-size: 13.5px !important;
    }
    .actions-label {
        font-size: 12.5px !important;
    }
    .attn-badge-btn {
        font-size: 11.5px !important;
    }
}

@media (min-width: 1920px) {
    /* Sidebar */
    .quick-link-item,
    .tree-list,
    .feed-row,
    .category-row,
    .section-title {
        font-size: 15px !important;
    }
    
    /* Entries list */
    .entry-card .card-title {
        font-size: 16px !important;
    }
    .card-desc {
        font-size: 14px !important;
    }
    .panel-header .header-title {
        font-size: 19px !important;
    }
    
    /* Article reading */
    .art-title {
        font-size: 32px !important;
    }
    .fulltext-body {
        font-size: 19px !important;
    }
    .ai-box-body {
        font-size: 17px !important;
    }
    .chat-bubble {
        font-size: 15px !important;
    }
    .chat-desc {
        font-size: 13px !important;
    }
    .system-message {
        font-size: 14px !important;
    }
    .text-btn {
        font-size: 14px !important;
    }
    .actions-label {
        font-size: 13px !important;
    }
    .attn-badge-btn {
        font-size: 12px !important;
    }
}

/* Back to Top Button */
.back-to-top-btn {
    position: absolute;
    bottom: 90px; /* Position above the AI floating button (which is at bottom: 30px) */
    right: 30px;  /* Align horizontally with the AI floating button */
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--card-bg, #ffffff);
    color: var(--accent-color, #6366f1);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
                visibility 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
                transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                background-color 0.2s, 
                color 0.2s, 
                bottom 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateY(12px);
    z-index: 100;
}
.back-to-top-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top-btn:hover {
    background-color: var(--accent-color, #6366f1);
    color: #ffffff;
    border-color: var(--accent-color, #6366f1);
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 6px 18px rgba(99, 102, 241, 0.35);
}
.back-to-top-btn:active {
    transform: translateY(0) scale(0.95);
}
/* Shift left and lower down when the chat column is open (AI button is hidden now) */
#detail-column.chat-open .back-to-top-btn {
    right: calc(380px + 30px);
    bottom: 30px;
}

/* ====================================================
   PWA SWIPE GESTURES & SAFE AREA STYLING
   ==================================================== */

/* 1. Pull to Refresh Style */
.ptr-container {
    height: 0;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    transition: height 0.2s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
    opacity: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.01);
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}
.ptr-container.visible {
    opacity: 1;
}
.ptr-icon svg {
    transition: transform 0.2s ease;
}
.ptr-container.loading .ptr-icon svg {
    animation: ptr-spin 1s linear infinite;
}
@keyframes ptr-spin {
    100% { transform: rotate(360deg); }
}

/* 2. Card Swipe Left to Mark Read */
.entry-card {
    position: relative !important;
    padding: 0 !important; /* Reset padding, move to inner content wrapper */
    overflow: hidden !important;
    background: transparent !important;
}

.entry-card-content {
    padding: 16px 20px;
    background: var(--card-bg);
    position: relative;
    z-index: 2;
    width: 100%;
    height: 100%;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    pointer-events: auto;
}
body.light-theme .entry-card-content {
    background: var(--bg-secondary) !important;
}
.entry-card.active .entry-card-content {
    background: var(--card-active-bg) !important;
}
body.light-theme .entry-card.active .entry-card-content {
    background: #eef2ff !important;
}

/* Background green container that reveals during swipe */
.entry-card-bg-action {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-color: #10b981; /* Green */
    color: white;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 24px;
    z-index: 1;
    font-weight: 600;
    font-size: 14px;
    gap: 6px;
    opacity: 0;
    transition: opacity 0.2s ease;
}
.entry-card-bg-action svg {
    stroke: currentColor;
    stroke-width: 3;
}

/* Swipe animations states */
.entry-card-content.swiped-out {
    transform: translateX(-100%) !important;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
}
.entry-card.collapsed {
    max-height: 0 !important;
    padding: 0 !important;
    margin: 0 !important;
    border: none !important;
    opacity: 0 !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    pointer-events: none;
}

/* 3. Safe Area Mobile Overrides */
@media (max-width: 900px) {
    /* Top Bar safe area */
    .panel-header {
        padding-top: calc(8px + env(safe-area-inset-top)) !important;
        min-height: calc(var(--header-height) + env(safe-area-inset-top)) !important;
    }
    
    /* Sidebar Footer safe area */
    #feeds-column .panel-footer {
        padding-bottom: calc(10px + env(safe-area-inset-bottom)) !important;
    }

    /* Scroll content offset bottom for home indicator */
    .panel-scroll-content {
        padding-bottom: calc(90px + env(safe-area-inset-bottom)) !important;
    }
    .article-scroll-view {
        padding-bottom: calc(120px + env(safe-area-inset-bottom)) !important;
    }
    
    /* Float buttons safe area */
    #back-to-top-btn {
        bottom: calc(20px + env(safe-area-inset-bottom)) !important;
    }
}

@media (max-width: 1250px) {
    /* Chat inputs area safe area */
    .chat-input-area {
        padding-bottom: calc(16px + env(safe-area-inset-bottom)) !important;
    }
    .floating-ai-btn {
        bottom: calc(50px + env(safe-area-inset-bottom)) !important;
    }
    
    /* Adjust back-to-top position when drawer is open in mobile landscape/portrait */
    #detail-column.chat-open .back-to-top-btn {
        right: 20px !important;
        bottom: calc(20px + env(safe-area-inset-bottom)) !important;
    }
}

/* ====================================================
   FIXES, LIGHT THEME EMBOSSING & FLOATING OPERATION BAR
   ==================================================== */

/* 1. Float Button Overlaps & Underlap Fixes */
@media (max-width: 900px) {
    /* Prevent Back-to-Top Button overlapping with AI Floating Button */
    #back-to-top-btn {
        bottom: calc(104px + env(safe-area-inset-bottom)) !important;
        right: 18px !important;
    }
    
    /* Feeds Column Footer adjustment to prevent underlap with home indicator */
    #feeds-column .panel-footer {
        padding: 16px 16px calc(16px + env(safe-area-inset-bottom)) 16px !important;
        box-sizing: border-box;
    }
}

/* 2. Light Theme - Border Softening & Stereoscopic Embossed Layout (All Three Columns) */
body.light-theme {
    --border-color: rgba(0, 0, 0, 0.05); /* Soften border color */
}

/* Light Theme Slider Unchecked/Checked Color Fix */
body.light-theme input:not(:checked) + .slider {
    background-color: #cbd5e1 !important; /* Soft grey slate for visibility when unchecked */
}
body.light-theme input:checked + .slider {
    background-color: var(--accent-indigo, #6366f1) !important; /* Indigo accent color when checked */
}

/* stereoscopic layout (Embossed edges & sunken content) */
.panel-scroll-content,
.article-scroll-view {
    position: relative;
    /* Sunken content effect using inset shadow */
    box-shadow: inset 0 4px 20px rgba(0, 0, 0, 0.03);
    background-color: var(--bg-primary, #0a0b10);
    transition: background-color 0.2s, box-shadow 0.2s;
}

body.light-theme .panel-scroll-content,
body.light-theme .article-scroll-view {
    background-color: #f8fafc !important; /* Sunken body background for all columns */
    box-shadow: inset 0 4px 18px rgba(15, 23, 42, 0.05) !important; /* Darker inset shadow for light theme */
}

body.light-theme .panel-header {
    background-color: rgba(255, 255, 255, 0.95) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03) !important;
    border-bottom: 1px solid rgba(0, 0, 0, 0.03) !important;
}

body.light-theme .panel-footer {
    background-color: rgba(255, 255, 255, 0.95) !important;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.03) !important;
    border-top: 1px solid rgba(0, 0, 0, 0.03) !important;
}

/* 3. Floating Article Actions Bar (Fixed, Non-scrolling Border) */
.article-actions-bar {
    display: flex;
    align-items: center;
    justify-content: center; /* Center container contents */
    z-index: 50;
    box-sizing: border-box;
    background-color: rgba(15, 17, 26, 0.75);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

/* Inner wrapper for layout alignment and width capping on desktop */
.article-actions-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    height: 100%;
}

/* Light Theme - Header/Footer Action Bar Embossed/Raised Styles */
body.light-theme .article-actions-bar {
    background-color: rgba(255, 255, 255, 0.9) !important;
    border-color: rgba(0, 0, 0, 0.04) !important;
}

/* Section styling inside action bar */
.article-actions-bar .bar-section {
    display: flex;
    align-items: center;
    gap: 8px;
}

.article-actions-bar .bar-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* Custom premium icon button styles */
.bar-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    outline: none;
}

.bar-icon-btn svg {
    transition: transform 0.2s ease, stroke 0.2s ease, fill 0.2s ease;
    flex-shrink: 0;
}

/* Hover and active button states */
.bar-icon-btn:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.04);
}

body.light-theme .bar-icon-btn:hover {
    background-color: rgba(0, 0, 0, 0.03);
}

/* Attention Levels Specific Active Styling */
.bar-icon-btn.glance.active {
   color: #475569 !important; /* Grey - matches title bar */
   background-color: rgba(71, 85, 105, 0.1) !important;
   border-color: rgba(71, 85, 105, 0.15) !important;
}
.bar-icon-btn.skim.active {
  color: #3b82f6 !important; /* Blue - visible on both themes */
  background-color: rgba(59, 130, 246, 0.1) !important;
  border-color: rgba(59, 130, 246, 0.15) !important;
}
.bar-icon-btn.read.active {
   color: #f59e0b !important; /* Amber - matches title bar */
   background-color: rgba(245, 158, 11, 0.08) !important;
   border-color: rgba(245, 158, 11, 0.2) !important;
}

/* Starred utility status */
.bar-icon-btn.star-status.starred {
    color: #eab308 !important; /* Gold Yellow */
    background-color: rgba(234, 179, 8, 0.08) !important;
    border-color: rgba(234, 179, 8, 0.15) !important;
}
.bar-icon-btn.star-status.starred svg {
    fill: #eab308;
}



/* 4. Desktop (min-width: 901px) layout */
@media (min-width: 901px) {
    .article-actions-bar {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 52px;
        padding: 0 24px;
        border-top: none;
        border-left: none;
        border-right: none;
        /* Raised effect */
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    }
    
    body.light-theme .article-actions-bar {
        box-shadow: 0 2px 10px rgba(15, 23, 42, 0.04) !important; /* Elevated shadow for light theme top bar */
    }

    /* Constrain actions inner container width to match article content */
    .article-actions-inner {
        max-width: 700px;
        margin: 0 auto;
    }

    /* Fixed equal width for desktop button layout */
    .bar-icon-btn {
        width: 82px;
        justify-content: center;
        box-sizing: border-box;
    }

    /* Make desktop icons smaller per request */
    .bar-icon-btn svg {
        width: 12px !important;
        height: 12px !important;
    }

    .article-scroll-view {
        padding-top: 52px !important; /* Offset for top actions bar */
    }
}

/* 5. Mobile (max-width: 900px) layout */
@media (max-width: 900px) {
    .article-actions-bar {
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: calc(38px + env(safe-area-inset-bottom)); /* Capped height */
        padding: 2px 16px calc(2px + env(safe-area-inset-bottom)) 16px; /* Capped padding */
        border-bottom: none;
        border-left: none;
        border-right: none;
        /* Raised bottom-bar shadow */
        box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.2);
    }

    body.light-theme .article-actions-bar {
        box-shadow: 0 -2px 10px rgba(15, 23, 42, 0.04) !important; /* Elevated shadow for light theme bottom bar */
    }

    .article-actions-inner {
        justify-content: space-around;
        gap: 12px;
    }

    .article-actions-bar .bar-label {
        display: none; /* Hide labels on mobile to save space */
    }
    
    .article-actions-bar .bar-section {
        flex-grow: 1;
        justify-content: space-around;
        gap: 4px;
    }

    .bar-icon-btn {
        flex-direction: column;
        gap: 1px;
        padding: 2px 8px;
        font-size: 9px; /* Micro label text below icon */
        flex: 1;
        max-width: 70px;
    }

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

    .article-scroll-view {
        padding-bottom: calc(44px + env(safe-area-inset-bottom)) !important; /* Shrank offset for bottom bar */
    }
}

/* 6. Undo Mark Toast - Soft Ellipse & No wrap styles */
.undo-toast {
    position: fixed;
    bottom: calc(24px + env(safe-area-inset-bottom));
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: rgba(15, 17, 26, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--accent-indigo);
    border-radius: 50px; /* Unified ellipse */
    padding: 8px 24px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 9999;
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s ease;
    pointer-events: none;
    white-space: nowrap; /* Prevent dynamic wrapping */
}

body.light-theme .undo-toast {
    background: rgba(255, 255, 255, 0.95) !important;
    border-color: var(--accent-indigo) !important;
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.1) !important;
}

.undo-toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    pointer-events: auto;
}

.undo-toast-text {
    font-size: 13px;
    color: var(--text-primary);
    font-weight: 500;
    white-space: nowrap;
}

.undo-toast-btn {
    background: var(--accent-indigo);
    color: #ffffff;
    font-size: 12px;
    font-weight: 600;
    padding: 5px 14px;
    border-radius: 30px; /* Unified ellipse button */
    display: flex;
    align-items: center;
    gap: 4px;
    box-shadow: none; /* Flatten shadow for unified theme */
    border: none;
    outline: none;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.undo-toast-btn:hover {
    background: #4f46e5;
    transform: scale(1.05);
}

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