/* Import Fonts */
@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@300;400;500;600;700;800&family=Playfair+Display:ital,wght@0,400;0,600;1,400&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* CSS Variables for Themes */
:root {
    --transition-speed: 0.3s;

    /* Dark Theme Variables (Default) */
    --bg-primary: #07090e;
    --bg-secondary: rgba(15, 22, 36, 0.85);
    --bg-tertiary: rgba(30, 41, 59, 0.7);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-color: #06b6d4;
    --accent-hover: #22d3ee;
    --accent-glow: rgba(6, 182, 212, 0.15);
    --border-color: rgba(255, 255, 255, 0.08);
    --highlight-bg: rgba(234, 179, 8, 0.3);
    --highlight-text: #fef08a;
    --code-bg: #0f172a;
    --sidebar-width: 340px;
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Manrope', sans-serif;
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --glass-blur: blur(12px);
}

[data-theme="light"] {
    /* Light Theme Variables */
    --bg-primary: #f8fafc;
    --bg-secondary: rgba(255, 255, 255, 0.9);
    --bg-tertiary: rgba(241, 245, 249, 0.9);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent-color: #0891b2;
    --accent-hover: #0e7490;
    --accent-glow: rgba(8, 145, 178, 0.1);
    --border-color: rgba(0, 0, 0, 0.08);
    --highlight-bg: rgba(254, 240, 138, 0.7);
    --highlight-text: #854d0e;
    --code-bg: #e2e8f0;
    --card-shadow: 0 8px 32px 0 rgba(148, 163, 184, 0.15);
}

/* Font Families for Reading Pane */
.font-sans {
    font-family: 'Inter', sans-serif !important;
}

.font-serif {
    font-family: 'Playfair Display', Georgia, serif !important;
}

.font-tech {
    font-family: 'Space Grotesk', sans-serif !important;
}

/* Reset and Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-family: var(--font-body);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    min-height: 100vh;
    overflow: hidden;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* App Layout */
.app-container {
    display: flex;
    width: 100%;
    height: 100vh;
    position: relative;
}

/* Reading Progress Bar */
.progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: transparent;
    z-index: 1000;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-hover));
    box-shadow: 0 0 8px var(--accent-color);
    transition: width 0.1s ease;
}

/* Sidebar Styling */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
    z-index: 100;
    transition: transform var(--transition-speed), background-color var(--transition-speed), border-color var(--transition-speed), width var(--transition-speed);
}

.sidebar.collapsed {
    display: none !important;
}

/* Sidebar Brand & Header */
.sidebar-header {
    padding: 0.85rem 1.15rem 0.65rem 1.15rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0;
    cursor: pointer;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.sidebar-brand:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.sidebar-brand:active {
    transform: translateY(1.5px);
}

.brand-icon {
    font-size: 1.5rem;
    color: var(--accent-color);
    filter: drop-shadow(0 0 6px var(--accent-glow));
}

.sidebar-title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--text-primary);
}

/* Book Selector Dropdown Style */
.book-selector-container {
    position: relative;
    width: 100%;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
}

.book-select-icon {
    position: absolute;
    left: 0.8rem;
    color: var(--accent-color);
    font-size: 0.85rem;
    pointer-events: none;
}

.book-selector {
    width: 100%;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem 0.5rem 2.2rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    outline: none;
    cursor: pointer;
    transition: all 0.2s ease;
    appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg fill='%2306b6d4' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'><path d='M7 10l5 5 5-5z'/><path d='M0 0h24v24H0z' fill='none'/></svg>");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    background-size: 1.25rem;
}

.book-selector:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 0.75rem;
    justify-content: space-between;
}

.btn-icon {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-icon:hover {
    background: var(--accent-color);
    color: #ffffff;
    border-color: var(--accent-color);
    box-shadow: 0 0 10px var(--accent-glow);
    transform: translateY(-2px);
}

/* Search Box style updates */
.search-box {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.search-input-wrapper {
    position: relative;
    width: 100%;
}

.search-input {
    width: 100%;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem 0.5rem 2.2rem;
    border-radius: 8px;
    font-size: 0.85rem;
    outline: none;
    transition: all 0.2s ease;
}

.search-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.search-icon {
    position: absolute;
    left: 0.8rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 0.85rem;
    pointer-events: none;
}

.search-navigation {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    font-size: 0.8rem;
}

.search-navigation button {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
}

.search-navigation button:hover {
    background: var(--accent-color);
    color: white;
}

/* Sidebar Tabs Navigation */
.sidebar-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.1);
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    padding: 0.75rem 0.25rem;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.02);
}

.tab-btn.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
    background: rgba(6, 182, 212, 0.03);
}

/* Sidebar Tab Contents Pane */
.sidebar-content {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.tab-pane {
    display: none;
    height: 100%;
    overflow-y: auto;
    position: relative;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.tab-pane::-webkit-scrollbar {
    width: 4px;
}

.tab-pane::-webkit-scrollbar-track {
    background: transparent;
}

.tab-pane::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
}

.tab-pane::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

.tab-pane.active {
    display: block;
}

/* Sidebar Navigation Items */
.sidebar-nav {
    padding: 0.5rem 0;
}

.nav-item {
    display: block;
    padding: 0.5rem 1.25rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    line-height: 1.4;
    border-left: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.nav-item.active {
    color: var(--accent-color) !important;
    background: rgba(6, 182, 212, 0.12) !important;
    border-left-color: var(--accent-color) !important;
    font-weight: 600;
    box-shadow: inset 0 0 10px rgba(6, 182, 212, 0.08);
}

.nav-item.nav-phan {
    color: #ffffff !important;
    font-weight: 700 !important;
}

.nav-h1 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-top: 0.75rem;
    padding-left: 1rem;
    color: var(--text-primary);
}

.nav-h2 {
    padding-left: 1.5rem;
    font-weight: 500;
}

.nav-h3 {
    padding-left: 2rem;
    font-size: 0.8rem;
}

/* Scientific Tools Tab Styling */
.tools-container,
.highlights-container {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tool-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

#focus-active-block {
    overflow: visible !important;
}

.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--card-shadow);
}

.tool-card-header {
    background: rgba(0, 0, 0, 0.15);
    padding: 0.75rem 1rem;
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-color);
    border-bottom: 1px solid var(--border-color);
}

.tool-card-body {
    padding: 1rem;
}

.tool-description {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.form-group {
    margin-bottom: 0.75rem;
}

.form-group label {
    display: block;
    font-size: 0.75rem;
    margin-bottom: 0.25rem;
    color: var(--text-secondary);
}

.form-group input,
.form-group select {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    font-size: 0.8rem;
    outline: none;
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--accent-color);
}

.btn-primary,
.btn-secondary,
.btn-success,
.btn-danger {
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    width: 100%;
}

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

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

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
}

.btn-success {
    background: #10b981;
    color: #fff;
}

.btn-success:hover {
    background: #059669;
}

.btn-danger {
    background: #ef4444;
    color: #fff;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-sm {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
}

.tool-result {
    margin-top: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-primary);
    border-radius: 6px;
    border-left: 3px solid var(--accent-color);
    font-size: 0.75rem;
    line-height: 1.4;
    color: var(--text-primary);
    word-break: break-word;
}

/* Game Simulation stats & history */
.game-stats {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    font-weight: 600;
    background: var(--bg-primary);
    padding: 0.5rem;
    border-radius: 6px;
    margin-bottom: 0.75rem;
}

.game-controls {
    display: flex;
    gap: 0.5rem;
}

.game-history {
    margin-top: 0.75rem;
    max-height: 120px;
    overflow-y: auto;
    font-size: 0.7rem;
    background: var(--bg-primary);
    border-radius: 6px;
    padding: 0.5rem;
    color: var(--text-secondary);
}

.game-history-row {
    padding: 0.2rem 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
}

.game-history-row:last-child {
    border-bottom: none;
}

/* Saved Highlights list */
.section-title {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.empty-message {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: center;
    margin-top: 2rem;
}

.highlight-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    margin-bottom: 0.75rem;
    position: relative;
    transition: transform 0.2s;
}

.highlight-item:hover {
    transform: translateX(2px);
}

.highlight-item-text {
    font-size: 0.8rem;
    font-style: italic;
    color: var(--text-primary);
    line-height: 1.4;
    border-left: 2px solid var(--accent-color);
    padding-left: 0.5rem;
    margin-bottom: 0.5rem;
}

.highlight-item-note {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--bg-primary);
    padding: 0.4rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.highlight-item-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.highlight-delete-btn {
    background: transparent;
    border: none;
    color: #ef4444;
    cursor: pointer;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 0.75rem 1.25rem;
    border-top: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.15);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.reading-stat-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Main Reading Pane */
.reading-pane {
    flex: 1;
    min-width: 0;
    height: 100%;
    overflow-y: auto;
    background-color: var(--bg-primary);
    padding: 0 0 1rem 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    transition: padding var(--transition-speed);
    scrollbar-width: none; /* Hide scrollbar for clean dashboard look */
}

.reading-pane::-webkit-scrollbar {
    display: none; /* Hide scrollbar for Chrome/Safari */
}

/* Floating Top Navigation */
.top-nav {
    position: sticky;
    top: 0;
    width: 100%;
    height: 56px;
    background: var(--bg-secondary);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    justify-content: space-between;
    z-index: 90;
    margin-bottom: 2rem;
    transition: background-color var(--transition-speed);
}

.btn-nav {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    cursor: pointer;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    transition: background 0.2s;
}

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

.top-nav-title {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.2px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: none;
}

/* Content Container */
.content-container {
    max-width: 860px;
    width: 100%;
    min-width: 0;
    margin: 0 auto;
    padding: 0.5rem 2rem 4rem 2rem;
    line-height: 1.85;
    font-size: 1.05rem;
    font-weight: 400;
    color: var(--text-primary);
    word-break: break-word;
    overflow-wrap: break-word;
    transition: font-size 0.2s, line-height 0.2s, max-width 0.2s;
}

/* Typography elements */
.content-container h1,
.content-container h2,
.content-container h3,
.content-container h4 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    margin-top: 3rem;
    margin-bottom: 1.25rem;
    font-weight: 700;
    line-height: 1.3;
}

.content-container h1 {
    font-size: 2.35rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.65rem;
    margin-top: 0.5rem;
    margin-bottom: 1.65rem;
    letter-spacing: -0.02em;
}

.content-container h2 {
    font-size: 1.7rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3rem;
}

.content-container h3 {
    font-size: 1.3rem;
}

.content-container p {
    margin-bottom: 1.5rem;
}

.content-container strong {
    color: var(--accent-color);
    font-weight: 600;
}

.content-container ul,
.content-container ol {
    margin-bottom: 1.5rem;
    padding-left: 1.75rem;
}

.content-container li {
    margin-bottom: 0.5rem;
}

/* Pre & Code */
.content-container pre {
    background-color: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1.25rem;
    overflow-x: auto;
    max-width: 100%;
    margin-bottom: 1.5rem;
}

.content-container code {
    font-family: 'Consolas', 'Courier New', Courier, monospace;
    font-size: 0.85rem;
    background-color: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    color: #f43f5e;
}

.content-container pre code {
    background-color: transparent;
    padding: 0;
    color: inherit;
}

/* Blockquotes */
.content-container blockquote {
    border-left: 4px solid var(--accent-color);
    background-color: var(--bg-secondary);
    backdrop-filter: var(--glass-blur);
    padding: 1rem 1.5rem;
    margin: 1.75rem 0;
    border-radius: 0 10px 10px 0;
    font-style: italic;
    color: var(--text-secondary);
}

/* Tables */
.content-container table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    font-size: 0.95rem;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.content-container th,
.content-container td {
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    text-align: left;
}

.content-container th {
    background-color: rgba(0, 0, 0, 0.15);
    font-family: var(--font-heading);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-color);
}

.content-container tr:nth-child(even) td {
    background-color: rgba(255, 255, 255, 0.02);
}

/* HR */
.content-container hr {
    border: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
    margin: 3.5rem 0;
}

/* Search Highlighting */
mark {
    background-color: var(--highlight-bg);
    color: var(--highlight-text);
    border-radius: 3px;
    padding: 0 3px;
    box-shadow: 0 0 4px rgba(234, 179, 8, 0.3);
}

mark.current-match {
    background-color: #ef4444;
    color: white;
    box-shadow: 0 0 6px #ef4444;
}

/* Saved highlight marker in reading pane */
.text-highlight-yellow {
    background-color: rgba(234, 179, 8, 0.3);
    border-bottom: 2px dashed #eab308;
}

.text-highlight-green {
    background-color: rgba(34, 197, 94, 0.3);
    border-bottom: 2px dashed #22c55e;
}

.text-highlight-blue {
    background-color: rgba(59, 130, 246, 0.3);
    border-bottom: 2px dashed #3b82f6;
}

/* Floating action buttons */
.floating-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--bg-secondary);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 46px;
    height: 46px;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
    z-index: 85;
    transition: all 0.2s;
}

.floating-btn:hover {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    transform: translateY(-4px);
}

/* Settings Modal styling */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 500;
    display: none;
    align-items: center;
    justify-content: center;
}

.modal-overlay.open {
    display: flex;
}

.modal {
    background: var(--bg-secondary);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    max-width: 480px;
    width: 90%;
    box-shadow: var(--card-shadow);
    overflow: hidden;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }

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

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
}

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

.modal-body {
    padding: 1.5rem;
}

.setting-row {
    margin-bottom: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-row:last-child {
    margin-bottom: 0;
}

.setting-row label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.btn-group {
    display: flex;
    background: var(--bg-primary);
    padding: 0.25rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.btn-choice {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-choice:hover {
    color: var(--text-primary);
}

.btn-choice.active {
    background: var(--accent-color);
    color: white;
}

.font-size-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

#font-size-display {
    font-size: 0.95rem;
    font-weight: 600;
    min-width: 50px;
    text-align: center;
}

/* Highlight menu popover */
.highlight-menu {
    position: absolute;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.4rem;
    display: flex;
    gap: 0.4rem;
    box-shadow: var(--card-shadow);
    z-index: 300;
}

.highlight-menu button {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: transform 0.1s;
}

.highlight-menu button:hover {
    transform: scale(1.15);
}

#btn-add-note {
    background: var(--bg-tertiary) !important;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    border-radius: 6px !important;
    width: 32px !important;
}

/* TTS Player Floating Bottom Panel */
.tts-player {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-secondary);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    box-shadow: var(--card-shadow);
    z-index: 400;
    animation: slideUp 0.3s ease-out;
}

.tts-player-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-primary);
}

.tts-controls {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.btn-circle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s;
}

.btn-circle:hover {
    background: var(--accent-color);
    color: white;
    transform: scale(1.08);
}

.btn-circle.play {
    width: 40px;
    height: 40px;
    font-size: 0.95rem;
    background: var(--accent-color);
    color: white;
}

.btn-circle.play:hover {
    background: var(--accent-hover);
}

.btn-circle.stop:hover {
    background: #ef4444;
}

.tts-speed select,
.tts-voice select {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    outline: none;
    max-width: 150px;
}

/* Zen Mode / Sidebar Collapsed Styling */
body.zen-mode .sidebar {
    width: 0 !important;
    overflow: hidden;
    border-right: none;
    transform: translateX(-100%);
}

body.zen-mode .top-nav {
    left: 0;
    width: 100%;
}

body.zen-mode .top-nav-title {
    opacity: 1;
}

body.zen-mode .btn-nav {
    display: flex;
}

/* Mobile Toggle Menu */
.menu-toggle {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    background-color: var(--accent-color);
    color: #ffffff;
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 99;
    transition: background-color 0.2s, transform 0.2s;
}

.menu-toggle:hover {
    background-color: var(--accent-hover);
    transform: scale(1.05);
}

/* Responsive adjustments */
@media (max-width: 992px) {

    .top-nav {
        display: flex !important;
        padding: 0 0.85rem !important;
    }

    body:not(.zen-mode) .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        transform: translateX(-100%);
    }

    body:not(.zen-mode) .sidebar.open {
        transform: translateX(0);
    }

    body:not(.zen-mode) .menu-toggle {
        display: flex;
    }

    body:not(.zen-mode) .reading-pane {
        padding-top: 5rem;
    }
}

@media (max-width: 992px) {
    .tts-player {
        width: 92%;
        max-width: 500px;
        padding: 0.75rem 1rem;
        gap: 0.75rem;
        border-radius: 16px;
        bottom: 1.5rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .tts-player-info {
        display: none;
        /* Hide status text on smaller screens to save horizontal space */
    }

    .tts-chapter-select-container {
        width: 100%;
        justify-content: center;
        order: 1;
    }

    #tts-chapter-select {
        max-width: 100% !important;
        width: 100%;
        text-align: center;
    }

    .tts-controls {
        width: 100%;
        justify-content: center;
        order: 2;
        gap: 0.75rem;
    }

    .tts-speed {
        order: 3;
    }

    .tts-voice {
        order: 4;
        flex: 1;
    }

    .tts-voice select {
        width: 100%;
        max-width: 100%;
    }
}

/* TTS Active Interactive Mode */
body.tts-active .content-container p,
body.tts-active .content-container h1,
body.tts-active .content-container h2,
body.tts-active .content-container h3,
body.tts-active .content-container li {
    cursor: pointer;
    transition: background-color 0.2s ease, border-radius 0.2s ease;
    border-radius: 4px;
    padding-left: 4px;
    padding-right: 4px;
}

body.tts-active .content-container p:hover,
body.tts-active .content-container h1:hover,
body.tts-active .content-container h2:hover,
body.tts-active .content-container h3:hover,
body.tts-active .content-container li:hover {
    background-color: var(--accent-glow);
}

/* Zen5 Planner Task Styles */
.planner-form input,
.planner-form select {
    border-radius: 8px;
}

#task-desc {
    font-size: 0.95rem !important;
    padding: 0.75rem 1rem !important;
}

.filter-btn {
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.filter-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.filter-btn.active {
    background: var(--accent-color);
    color: #ffffff;
    border-color: var(--accent-color);
}

.task-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 0.8rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.5rem;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.task-item:hover {
    transform: translateX(2px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.task-item.q1 {
    border-left: 3px solid #ef4444;
}

.task-item.q2 {
    border-left: 3px solid #06b6d4;
}

.task-item.q3 {
    border-left: 3px solid #f59e0b;
}

.task-item.q4 {
    border-left: 3px solid #94a3b8;
}

.task-item-content {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex: 1;
    overflow: hidden;
}

.task-item-content input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    display: inline-grid;
    place-content: center;
    position: relative;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(255, 255, 255, 0.02);
    outline: none;
    flex-shrink: 0;
}

.task-item-content input[type="checkbox"]:hover {
    border-color: var(--accent-color);
    box-shadow: 0 0 5px rgba(6, 182, 212, 0.3);
}

.task-item-content input[type="checkbox"]:checked {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.task-item-content input[type="checkbox"]::before {
    content: "";
    width: 8px;
    height: 4px;
    border-left: 2px solid #0b1329;
    border-bottom: 2px solid #0b1329;
    transform: rotate(-45deg) translate(0.5px, -1px) scale(0);
    transition: transform 0.15s ease-in-out;
}

.task-item-content input[type="checkbox"]:checked::before {
    transform: rotate(-45deg) translate(0.5px, -1px) scale(1);
}

.task-item-text {
    font-size: 0.9rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    user-select: none;
}

.task-item.completed .task-item-text {
    text-decoration: line-through;
    color: var(--text-secondary);
}

.task-item-actions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.task-action-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.2rem;
    font-size: 0.85rem;
    transition: color 0.2s ease;
}

.task-action-btn:hover {
    color: var(--text-primary);
}

.task-action-btn.pin.active {
    color: #f59e0b;
}

.task-action-btn.delete:hover {
    color: #ef4444;
}

.task-action-btn.focus-active {
    color: var(--accent-color);
}

/* Eisenhower Matrix 2x2 Grid Styles */
.matrix-grid-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto;
    gap: 1rem;
    flex: 1;
    min-height: 480px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.matrix-grid-layout.matrix-list-mode {
    grid-template-columns: 1fr !important;
    gap: 0.75rem;
}

.matrix-quadrant {
    background: rgba(15, 23, 42, 0.45);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.85rem;
    display: flex;
    flex-direction: column;
    min-height: 145px;
    max-height: none;
    overflow-y: auto;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.matrix-quadrant:hover {
    transform: translateY(-2px);
    background: rgba(15, 23, 42, 0.55);
}

.matrix-quadrant::-webkit-scrollbar {
    width: 4px;
}

.matrix-quadrant::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 2px;
}

.matrix-quadrant.q1 {
    border-top: 3px solid #ef4444;
}

.matrix-quadrant.q2 {
    border-top: 3px solid #06b6d4;
}

.matrix-quadrant.q3 {
    border-top: 3px solid #f59e0b;
}

.matrix-quadrant.q4 {
    border-top: 3px solid #94a3b8;
}

.matrix-quadrant.q1:hover {
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.08);
    border-color: rgba(239, 68, 68, 0.3);
    border-top-color: #ef4444;
}

.matrix-quadrant.q2:hover {
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.08);
    border-color: rgba(6, 182, 212, 0.3);
    border-top-color: #06b6d4;
}

.matrix-quadrant.q3:hover {
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.08);
    border-color: rgba(245, 158, 11, 0.3);
    border-top-color: #f59e0b;
}

.matrix-quadrant.q4:hover {
    box-shadow: 0 6px 20px rgba(148, 163, 184, 0.08);
    border-color: rgba(148, 163, 184, 0.3);
    border-top-color: #94a3b8;
}

/* Active toggle button styles */
.matrix-toggle-btn.active {
    background: var(--accent-color) !important;
    color: #07090e !important;
    font-weight: 600;
}

[data-theme="light"] .matrix-toggle-btn.active {
    color: #ffffff !important;
}

.quadrant-header {
    font-size: 0.72rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    display: flex;
    align-items: center;
}

.matrix-quadrant.q1 .quadrant-header {
    color: #ef4444;
}

.matrix-quadrant.q2 .quadrant-header {
    color: #06b6d4;
}

.matrix-quadrant.q3 .quadrant-header {
    color: #f59e0b;
}

.matrix-quadrant.q4 .quadrant-header {
    color: #94a3b8;
}

.quadrant-list {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    flex: 1;
}

.matrix-task-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.35rem 0.5rem;
    font-size: 0.7rem;
    gap: 0.35rem;
    transition: all 0.2s;
}

.matrix-quadrant.q1 .matrix-task-item {
    border-left: 3px solid #ef4444;
}

.matrix-quadrant.q2 .matrix-task-item {
    border-left: 3px solid #06b6d4;
}

.matrix-quadrant.q3 .matrix-task-item {
    border-left: 3px solid #f59e0b;
}

.matrix-quadrant.q4 .matrix-task-item {
    border-left: 3px solid #94a3b8;
}

.matrix-task-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.matrix-task-item.completed {
    opacity: 0.6;
}

.matrix-task-item.completed .task-item-text {
    text-decoration: line-through;
}

.matrix-task-item .task-item-content {
    display: flex;
    align-items: flex-start;
    gap: 0.4rem;
    flex: 1;
    overflow: hidden;
}

.matrix-task-item .task-item-content input[type="checkbox"] {
    margin-top: 0.1rem;
}

.matrix-task-item .task-item-details {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.matrix-task-item .task-item-text {
    font-size: 0.75rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.matrix-task-item .task-action-btn {
    font-size: 0.7rem;
    padding: 0 0.1rem;
}

/* Views Switching & Layout for Zen5 Planner Main View */
.main-view {
    display: none;
    width: 100%;
    padding: 0 1.5rem;
    animation: plannerFadeIn 0.3s ease;
}

.main-view.active {
    display: block;
}

@keyframes plannerFadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

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

#view-planner {
    height: calc(100vh - 72px);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.planner-top-bar {
    flex-shrink: 0;
    margin-bottom: 0.75rem !important;
    padding: 0.6rem 1.1rem !important;
}

.planner-dashboard {
    flex: 1;
    min-height: 0;
    display: flex;
    gap: 1rem;
    padding: 0 0 0.5rem 0;
    align-items: stretch;
    overflow: hidden;
}

.planner-col-left {
    width: 340px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    scrollbar-width: thin;
}

.focus-section,
.backup-section {
    margin-bottom: 0.85rem !important;
}

.planner-col-right {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
}

.quadrant-list {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
    scrollbar-width: thin;
}

.quadrant-list::-webkit-scrollbar,
.planner-col-left::-webkit-scrollbar {
    width: 4px;
}

.quadrant-list::-webkit-scrollbar-track,
.planner-col-left::-webkit-scrollbar-track {
    background: transparent;
}

.quadrant-list::-webkit-scrollbar-thumb,
.planner-col-left::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.12);
    border-radius: 4px;
}

.quadrant-list::-webkit-scrollbar-thumb:hover,
.planner-col-left::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* Responsive adjustment for Tablets and Mobiles */
@media (max-width: 768px) {
    .reading-pane {
        padding: 4.5rem 1rem 6rem 1rem !important;
        /* Spacing for navbar and bottom scroll space */
        width: 100% !important;
        min-width: 0 !important;
    }

    .planner-top-bar {
        flex-direction: column;
        align-items: stretch !important;
        gap: 0.85rem !important;
    }

    .analytics-header-bar {
        justify-content: space-between;
        gap: 0.5rem !important;
    }

    .kpi-pill {
        padding: 0.35rem 0.6rem !important;
        flex: 1;
        justify-content: center;
    }

    .planner-dashboard {
        flex-direction: column;
        padding: 0.5rem 0 2rem 0;
        gap: 1.25rem;
    }

    .planner-col-left,
    .planner-col-right {
        width: 100% !important;
    }

    .matrix-grid-layout.matrix-list-mode {
        grid-template-columns: 1fr !important;
        grid-template-rows: auto !important;
        min-height: auto !important;
        gap: 0.75rem !important;
    }

    .matrix-grid-layout:not(.matrix-list-mode) {
        grid-template-columns: 1fr !important;
        grid-template-rows: auto !important;
        min-height: auto !important;
        gap: 0.75rem !important;
    }

    .matrix-quadrant {
        min-height: 140px;
    }
}

@media (max-width: 1150px) {
    body:not(.zen-mode) .reading-pane {
        padding: 4.5rem 1.25rem 6rem 1.25rem !important;
    }

    body:not(.zen-mode) .planner-dashboard {
        flex-direction: column;
        padding: 0.5rem 0 2rem 0;
        gap: 1.25rem;
    }

    body:not(.zen-mode) .planner-col-left,
    body:not(.zen-mode) .planner-col-right {
        width: 100% !important;
    }

    body:not(.zen-mode) .matrix-grid-layout.matrix-list-mode {
        grid-template-columns: 1fr !important;
        grid-template-rows: auto !important;
        min-height: auto !important;
        gap: 0.75rem !important;
    }

    body:not(.zen-mode) .matrix-grid-layout:not(.matrix-list-mode) {
        grid-template-columns: 1fr 1fr !important;
        grid-template-rows: auto !important;
        min-height: auto !important;
        gap: 0.75rem !important;
    }

    body:not(.zen-mode) .matrix-quadrant {
        min-height: 140px;
    }
}

@media (max-width: 576px) {
    .planner-form .form-row {
        flex-direction: column;
        gap: 0.5rem;
    }

    .planner-form .form-row select,
    .planner-form .form-row button {
        width: 100% !important;
        margin: 0;
        padding: 0.6rem !important;
    }
}

/* Library Book Card Style */
.library-book-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.library-book-card:hover {
    background: rgba(6, 182, 212, 0.05);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.1);
}

.library-book-card.active {
    background: rgba(6, 182, 212, 0.08);
    border-color: var(--accent-color);
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.15);
}

.library-book-card .book-icon {
    font-size: 1.5rem;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.library-book-card:hover .book-icon,
.library-book-card.active .book-icon {
    color: var(--accent-color);
}

.library-book-card .book-info {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    flex: 1;
    overflow: hidden;
}

.library-book-card .book-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.library-book-card .book-desc {
    font-size: 0.65rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Task Item Details Container */
.task-item-details {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

/* Linked Book Badge Style */
.task-book-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.68rem;
    font-weight: 500;
    color: var(--accent-color);
    background: rgba(6, 182, 212, 0.06);
    border: 1px solid rgba(6, 182, 212, 0.15);
    border-radius: 6px;
    padding: 0.15rem 0.45rem;
    margin-top: 0.25rem;
    align-self: flex-end;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.task-book-badge:hover {
    background: rgba(6, 182, 212, 0.12);
    border-color: var(--accent-color);
    color: var(--accent-hover);
}

/* Custom Select Container */
.custom-select-wrapper {
    position: relative;
    flex: 1;
}

.custom-select-trigger {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    padding: 0.6rem 0.8rem;
    font-size: 0.82rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.custom-select-trigger:hover {
    border-color: var(--accent-color);
    box-shadow: 0 0 8px var(--accent-glow);
}

.custom-select-trigger .trigger-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
    margin-right: 0.5rem;
}

.custom-select-trigger .chevron-icon {
    font-size: 0.75rem;
    color: var(--text-secondary);
    transition: transform 0.2s ease;
}

.custom-select-wrapper.open .chevron-icon {
    transform: rotate(180deg);
    color: var(--accent-color);
}

/* Custom Select Menu Dropdown / Popup */
.custom-select-menu {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    z-index: 200;
    display: none;
    flex-direction: column;
    padding: 0.4rem;
    gap: 0.25rem;
    transform-origin: top;
    animation: selectMenuFadeIn 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes selectMenuFadeIn {
    from {
        opacity: 0;
        transform: scaleY(0.9);
    }

    to {
        opacity: 1;
        transform: scaleY(1);
    }
}

.custom-select-wrapper.open .custom-select-menu {
    display: flex;
}

.custom-select-option {
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    transition: all 0.2s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.custom-select-option:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.custom-select-option.selected {
    background: var(--accent-glow);
    color: var(--accent-color);
    font-weight: 500;
}

/* Quadrant dots inside dropdown */
.q-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.q1-dot {
    background: #ef4444;
}

.q2-dot {
    background: #06b6d4;
}

.q3-dot {
    background: #f97316;
}

.q4-dot {
    background: #64748b;
}

/* Custom Select Option inside Modal Popup */
.modal-select-option {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.modal-select-option:hover {
    background: rgba(6, 182, 212, 0.05);
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

.modal-select-option.selected {
    background: var(--accent-glow);
    border-color: var(--accent-color);
    color: var(--accent-color);
    font-weight: 600;
}

/* Premium Ambient Buttons for Pomodoro */
.ambient-btn {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.85rem;
}

.ambient-btn:hover {
    border-color: var(--accent-color);
    color: var(--text-primary);
    transform: scale(1.08);
}

.ambient-btn.active {
    background: var(--accent-glow);
    border-color: var(--accent-color);
    color: var(--accent-color);
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Math Block Responsive Styles */
.katex-display,
.MathJax_Display,
.math,
.formula {
    overflow-x: auto !important;
    overflow-y: hidden !important;
    max-width: 100% !important;
    -webkit-overflow-scrolling: touch;
}

/* Optimization for Selection Modal & Custom Dialog */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(7, 9, 14, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: none;
    /* Hide by default */
    align-items: center;
    justify-content: center;
    z-index: 2000;
    overflow-y: auto;
    padding: 1.5rem;
}

.modal-overlay.open {
    display: flex;
    /* Show only when opened */
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 100%;
    max-width: 820px;
    /* Bằng với độ rộng trang đọc sách mặc định (820px) */
    max-height: 90vh;
    /* Keep within viewport */
    display: flex;
    flex-direction: column;
    box-shadow: var(--card-shadow);
    animation: modalFadeIn 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    /* Scroll inside the modal */
    max-height: 60vh;
    /* Dynamic max height for lists */
    padding: 1.25rem;
}

/* Scrollbar styling for modal body */
.modal-body::-webkit-scrollbar {
    width: 6px;
}

.modal-body::-webkit-scrollbar-track {
    background: transparent;
}

.modal-body::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

.modal-body::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

/* ==========================================================================
   Header Mode Switcher & Content-First Layout Styles
   ========================================================================== */

/* Mode Switcher in Header */
.mode-switcher {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background: rgba(0, 0, 0, 0.25);
    padding: 3px 4px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.4rem 0.85rem;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: 7px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mode-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.mode-btn.active {
    color: var(--accent-color);
    background: rgba(66, 133, 244, 0.15);
}

/* Main View Toggle */
.main-view {
    display: none;
    width: 100%;
    height: 100%;
}

.main-view.active {
    display: block;
}

/* Reader Layout Grid with Dynamic Columns */
.reader-layout-grid {
    display: grid;
    grid-template-columns: 1fr 310px;
    gap: 1.25rem;
    width: 100%;
    max-width: 1540px;
    margin: 0 auto;
    height: calc(100vh - 60px);
    overflow: hidden;
    padding: 1rem 1.25rem;
    transition: grid-template-columns 0.3s ease;
}

.reader-layout-grid:has(.planner-widget-sidebar.collapsed) {
    grid-template-columns: 1fr !important;
}

.reader-main-col {
    height: 100%;
    overflow-y: auto;
    padding-right: 0.5rem;
}

/* Zen5 Right Companion Widget Panel */
.planner-widget-sidebar {
    background: var(--bg-secondary);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    height: 100%;
    overflow-y: auto;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
}

.planner-widget-sidebar.collapsed {
    display: none;
}

.widget-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid var(--border-color);
}

.widget-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.92rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.widget-action-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.3rem 0.55rem;
    border-radius: 7px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s;
}

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

.widget-card {
    background: rgba(255, 255, 255, 0.025);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.85rem;
}

.widget-card-title {
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 0.6rem;
    color: var(--text-primary);
}

/* Widget Stats */
.widget-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
}

.widget-stat-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.75rem;
}

.widget-stat-item div {
    display: flex;
    flex-direction: column;
}

.w-label {
    font-size: 0.65rem;
    color: var(--text-secondary);
}

.w-val {
    font-weight: 700;
    color: var(--text-primary);
}

/* Widget Pomodoro Active */
.w-task-name {
    font-size: 0.8rem;
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.w-timer {
    font-size: 1.8rem;
    font-weight: 700;
    font-family: monospace;
    color: var(--accent-color);
    text-align: center;
    margin: 0.3rem 0;
}

.w-pomo-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.btn-sm {
    padding: 0.35rem 0.75rem !important;
    font-size: 0.75rem !important;
    border-radius: 6px !important;
}

/* Widget Matrix Pill Grid */
.matrix-pill-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.45rem;
    margin-top: 0.4rem;
}

.m-pill {
    font-size: 0.73rem;
    padding: 0.4rem 0.6rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.m-pill-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
}

.m-pill-dot.q1 { background: #ef4444; }
.m-pill-dot.q2 { background: #06b6d4; }
.m-pill-dot.q3 { background: #f59e0b; }
.m-pill-dot.q4 { background: #94a3b8; }

/* Responsive Grid for Smaller Screens */
@media (max-width: 1100px) {
    .reader-layout-grid {
        grid-template-columns: 1fr;
    }
    
    .planner-widget-sidebar {
        position: fixed;
        right: 1rem;
        top: 70px;
        width: 320px;
        max-height: calc(100vh - 90px);
        z-index: 99;
        display: none;
    }
    
    .planner-widget-sidebar.open {
        display: flex !important;
    }
}

/* ==========================================
   NOTEBOOKLM (GEMINI NOTEBOOK) STYLES
   ========================================== */

.nlm-hub-wrapper {
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
    padding: 0.85rem 1.5rem 1.5rem 1.5rem;
    box-sizing: border-box;
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow-y: auto;
    scrollbar-width: thin;
}

/* 1. NotebookLM Top Bar & Navigation Pills */
.nlm-top-bar {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.85rem;
    padding-bottom: 0.85rem;
    border-bottom: 1px solid var(--border-color);
}

.header-hub-tagline {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.04);
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    margin-left: 0.5rem;
    backdrop-filter: var(--glass-blur);
    white-space: nowrap;
}

.header-hub-tagline i {
    font-size: 0.9rem;
}

.nlm-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: wrap;
    width: 100%;
    margin-left: 0;
}

.nlm-right-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-left: auto;
}

.nlm-pills-nav {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    overflow-x: auto;
    scrollbar-width: none;
    padding: 2px 0;
    width: 100%;
}

.nlm-pills-nav::-webkit-scrollbar {
    display: none;
}

.nlm-pill {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    padding: 0.5rem 1.15rem;
    border-radius: 20px;
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.nlm-pill:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nlm-pill.active {
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent-color);
    font-weight: 600;
    border-color: rgba(6, 182, 212, 0.3);
}

[data-theme="light"] .nlm-pill.active {
    background: #e2e8f0;
    color: #0f172a;
}

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

.nlm-search-icon {
    position: absolute;
    left: 0.85rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    pointer-events: none;
}

.nlm-search-input {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 0.48rem 0.85rem 0.48rem 2.2rem;
    color: var(--text-primary);
    font-size: 0.85rem;
    width: 200px;
    transition: all 0.25s ease;
}

.nlm-search-input:focus {
    outline: none;
    width: 260px;
    border-color: var(--accent-color);
    box-shadow: 0 0 12px var(--accent-glow);
}

/* View Switchers */
.nlm-view-toggles {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 3px;
    gap: 2px;
}

.nlm-view-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.nlm-view-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
}

.nlm-view-btn.active {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-primary);
}

[data-theme="light"] .nlm-view-btn.active {
    background: #cbd5e1;
    color: #0f172a;
}

/* Sort Select Dropdown */
.nlm-sort-select {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.48rem 2rem 0.48rem 0.85rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    transition: border-color 0.2s;
}

.nlm-sort-select:hover {
    border-color: rgba(255, 255, 255, 0.2);
}

/* Create New Button */
.nlm-create-btn {
    background: #0f172a;
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 0.5rem 1.25rem;
    border-radius: 20px;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.45rem;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
    transition: all 0.25s ease;
}

[data-theme="light"] .nlm-create-btn {
    background: #000000;
    color: #ffffff;
}

.nlm-create-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
    background: #1e293b;
}

/* 3. Section Header */
.nlm-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.nlm-section-title {
    font-size: 1.4rem;
    font-weight: 600;
    font-family: var(--font-heading);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.nlm-see-all-link {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    transition: color 0.2s;
}

.nlm-see-all-link:hover {
    color: var(--accent-color);
}

.nlm-grid-view {
    width: 100% !important;
    display: block !important;
}

#nlm-grid-notebooks-list,
.nlm-grid-flow {
    display: grid !important;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)) !important;
    gap: 1.2rem !important;
    width: 100% !important;
}

/* Main View Visibility Controls */
.main-view {
    display: none !important;
}

.main-view.active {
    display: flex !important;
    flex-direction: column;
}

#view-notebooks {
    height: calc(100vh - 72px);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.nlm-hub-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow-y: auto;
    scrollbar-width: none; /* Hide scrollbar for clean look */
}

.nlm-hub-wrapper::-webkit-scrollbar {
    display: none; /* Hide scrollbar for Chrome/Safari */
}

/* Create New Notebook Card */
.nlm-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 18px;
    padding: 0.95rem 1.15rem;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 155px;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: var(--glass-blur);
    user-select: none;
}

.nlm-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.35), 0 0 20px var(--accent-glow);
    border-color: var(--accent-color);
}

.nlm-create-card:hover {
    border-color: var(--accent-color) !important;
    background: rgba(6, 182, 212, 0.08) !important;
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(6, 182, 212, 0.18);
}

[data-theme="light"] .nlm-create-card {
    border-color: rgba(0, 0, 0, 0.12);
    background: rgba(255, 255, 255, 0.6);
}

/* Matrix Quadrant Hover Glow Effects & Header Backgrounds */
.matrix-quadrant {
    transition: all 0.25s ease;
    border-radius: 12px;
    padding: 0.85rem;
    border: 1px solid var(--border-color);
}

.matrix-quadrant .quadrant-header {
    padding: 0.45rem 0.65rem;
    border-radius: 8px;
    margin-bottom: 0.65rem !important;
}

.matrix-quadrant.q1 .quadrant-header {
    background: rgba(239, 68, 68, 0.08);
    border-bottom: 1px solid rgba(239, 68, 68, 0.2);
}

.matrix-quadrant.q2 .quadrant-header {
    background: rgba(6, 182, 212, 0.08);
    border-bottom: 1px solid rgba(6, 182, 212, 0.2);
}

.matrix-quadrant.q3 .quadrant-header {
    background: rgba(245, 158, 11, 0.08);
    border-bottom: 1px solid rgba(245, 158, 11, 0.2);
}

.matrix-quadrant.q4 .quadrant-header {
    background: rgba(148, 163, 184, 0.08);
    border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.matrix-quadrant:hover {
    border-color: rgba(255, 255, 255, 0.18);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.matrix-quadrant.q1:hover {
    border-color: rgba(239, 68, 68, 0.4);
    box-shadow: 0 0 16px rgba(239, 68, 68, 0.15);
}

.matrix-quadrant.q2:hover {
    border-color: rgba(6, 182, 212, 0.4);
    box-shadow: 0 0 16px rgba(6, 182, 212, 0.15);
}

.matrix-quadrant.q3:hover {
    border-color: rgba(245, 158, 11, 0.4);
    box-shadow: 0 0 16px rgba(245, 158, 11, 0.15);
}

.matrix-quadrant.q4:hover {
    border-color: rgba(148, 163, 184, 0.4);
    box-shadow: 0 0 16px rgba(148, 163, 184, 0.15);
}

.nlm-create-card:hover {
    border-color: var(--accent-color);
    background: rgba(6, 182, 212, 0.05);
}

.nlm-create-plus-icon {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    background: rgba(66, 133, 244, 0.12);
    color: #4285f4;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    transition: transform 0.25s ease;
}

.nlm-create-card:hover .nlm-create-plus-icon {
    transform: scale(1.1);
    background: #4285f4;
    color: #ffffff;
    box-shadow: 0 0 20px rgba(66, 133, 244, 0.4);
}

.nlm-create-card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Notebook Item Card */
.nlm-card-header-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    width: 100%;
}

.nlm-card-icon-badge {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Preset Pastel Icon Badges */
.nlm-badge-lotus { background: linear-gradient(135deg, #fef3c7, #fde68a); color: #d97706; }
.nlm-badge-gamepad { background: linear-gradient(135deg, #e0e7ff, #c7d2fe); color: #4f46e5; }
.nlm-badge-heart { background: linear-gradient(135deg, #ffe4e6, #fecdd3); color: #e11d48; }
.nlm-badge-dharma { background: linear-gradient(135deg, #f3e8ff, #e9d5ff); color: #9333ea; }
.nlm-badge-chart { background: linear-gradient(135deg, #e0f2fe, #bae6fd); color: #0284c7; }
.nlm-badge-scroll { background: linear-gradient(135deg, #ffedd5, #fed7aa); color: #ea580c; }
.nlm-badge-yinyang { background: linear-gradient(135deg, #f1f5f9, #cbd5e1); color: #334155; }
.nlm-badge-brain { background: linear-gradient(135deg, #ccfbf1, #99f6e4); color: #0d9488; }
.nlm-badge-lightbulb { background: linear-gradient(135deg, #fef08a, #fde047); color: #ca8a04; }
.nlm-badge-graduation { background: linear-gradient(135deg, #dcfce7, #86efac); color: #16a34a; }
.nlm-badge-atom { background: linear-gradient(135deg, #e0f2fe, #7dd3fc); color: #0284c7; }
.nlm-badge-star { background: linear-gradient(135deg, #fef9c3, #fef08a); color: #ca8a04; }
.nlm-badge-compass { background: linear-gradient(135deg, #e0e7ff, #a5b4fc); color: #4338ca; }
.nlm-badge-book { background: linear-gradient(135deg, #e0f2fe, #bae6fd); color: #0284c7; }

.nlm-card-menu-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.2s, color 0.2s;
}

.nlm-card-menu-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.nlm-card-title {
    font-size: 0.98rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
    margin: 0.85rem 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.75rem;
}

.nlm-create-card.drag-active {
    border-color: var(--accent-color) !important;
    background: rgba(6, 182, 212, 0.15) !important;
    transform: scale(1.02);
    box-shadow: 0 0 25px rgba(6, 182, 212, 0.4), inset 0 0 15px rgba(6, 182, 212, 0.2);
    animation: dragPulse 1.2s infinite alternate;
}

@keyframes dragPulse {
    from { border-color: rgba(6, 182, 212, 0.5); }
    to { border-color: rgba(34, 211, 238, 1); }
}

.nlm-card-footer {
    font-size: 0.78rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.nlm-dot-sep {
    font-size: 0.6rem;
    opacity: 0.6;
}

/* 5. List / Table View Styling */
.nlm-list-view {
    width: 100%;
}

.nlm-table-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.nlm-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.nlm-table th {
    padding: 1rem 1.25rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.15);
    text-transform: capitalize;
}

[data-theme="light"] .nlm-table th {
    background: rgba(0, 0, 0, 0.03);
}

.nlm-table td {
    padding: 1rem 1.25rem;
    font-size: 0.9rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.nlm-table tr:last-child td {
    border-bottom: none;
}

.nlm-table-row {
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.nlm-table-row:hover {
    background: rgba(255, 255, 255, 0.04);
}

[data-theme="light"] .nlm-table-row:hover {
    background: rgba(0, 0, 0, 0.025);
}

.nlm-table-title-cell {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    font-weight: 600;
}

.nlm-table-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    flex-shrink: 0;
}

.nlm-table-sources {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.nlm-table-created {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.nlm-table-role {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Context Menu Dropdown */
.nlm-dropdown-menu {
    position: fixed;
    background: rgba(15, 23, 42, 0.96);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 6px;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6), 0 0 1px rgba(255, 255, 255, 0.15);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    width: 210px;
    backdrop-filter: blur(20px);
    animation: nlmMenuFadeIn 0.18s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

[data-theme="light"] .nlm-dropdown-menu {
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

@keyframes nlmMenuFadeIn {
    from { opacity: 0; transform: translateY(-6px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.nlm-dropdown-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.08);
    margin: 4px 6px;
}

[data-theme="light"] .nlm-dropdown-divider {
    background: rgba(0, 0, 0, 0.08);
}

.nlm-dropdown-item {
    background: transparent;
    border: none;
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    font-size: 0.83rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    transition: all 0.15s ease;
    white-space: nowrap;
    width: 100%;
    box-sizing: border-box;
}

.nlm-dropdown-item i {
    font-size: 0.9rem;
    width: 18px;
    text-align: center;
}

.nlm-dropdown-item:hover {
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="light"] .nlm-dropdown-item:hover {
    background: rgba(0, 0, 0, 0.05);
}

.nlm-dropdown-item.danger {
    color: #ef4444;
}

.nlm-dropdown-item.danger:hover {
    background: rgba(239, 68, 68, 0.12);
}

/* Badge Pills for Pin and Favorite on Cards */
.nlm-badge-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    font-size: 0.8rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
}

.nlm-badge-pill.pin {
    color: var(--accent-color);
    background: rgba(6, 182, 212, 0.12);
    border-color: rgba(6, 182, 212, 0.3);
}

.nlm-badge-pill.fav {
    color: #eab308;
    background: rgba(234, 179, 8, 0.12);
    border-color: rgba(234, 179, 8, 0.3);
}

/* Toast Notification Styling */
.zen5-toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1.25rem;
    border-radius: 14px;
    font-size: 0.88rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45);
    backdrop-filter: var(--glass-blur);
    animation: zen5ToastSlideIn 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    pointer-events: auto;
}

@keyframes zen5ToastSlideIn {
    from { opacity: 0; transform: translateY(20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.zen5-toast.fade-out {
    animation: zen5ToastFadeOut 0.35s ease forwards;
}

@keyframes zen5ToastFadeOut {
    to { opacity: 0; transform: translateY(10px) scale(0.95); }
}

/* Responsive adjustments */
@media (max-width: 900px) {
    .nlm-hub-wrapper {
        padding: 1rem;
    }
    
    .nlm-top-bar {
        flex-direction: column;
        align-items: stretch;
        flex-wrap: wrap;
    }
    
    .nlm-controls {
        justify-content: space-between;
        margin-left: 0;
        width: 100%;
        flex-wrap: wrap;
    }
    
    .nlm-search-input {
        width: 140px;
    }
    
    .nlm-search-input:focus {
        width: 180px;
    }
    
    .nlm-grid-view {
        grid-template-columns: 1fr;
    }
}

/* ==========================================
   ZEN MODE (FOCUS READING MODE)
   ========================================== */
body.zen-mode #sidebar {
    display: none !important;
}

body.zen-mode #planner-widget-sidebar {
    display: none !important;
}

body.zen-mode .reader-layout-grid {
    grid-template-columns: 1fr !important;
}

body.zen-mode .reading-pane {
    padding: 1.5rem !important;
    width: 100vw !important;
    max-width: 100vw !important;
    margin: 0 !important;
}

body.zen-mode .content-container {
    max-width: 760px !important;
    font-size: 1.15rem !important;
    line-height: 1.85 !important;
}

body.zen-mode #zen-mode-toggle {
    color: var(--accent-color) !important;
    background: rgba(6, 182, 212, 0.15) !important;
    border: 1px solid rgba(6, 182, 212, 0.3) !important;
}

.planner-top-bar {
    padding: 0.65rem 1.15rem !important;
    margin-bottom: 0.65rem !important;
}

.planner-dashboard {
    display: flex;
    gap: 1.1rem;
    align-items: stretch;
    flex: 1;
    min-height: 0;
    margin-bottom: 0.85rem;
}

.planner-col-left {
    width: 330px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    flex-shrink: 0;
}

.planner-col-left .backup-section {
    margin-top: 0;
}

.planner-col-right {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

@media (max-width: 992px) {
    .planner-dashboard {
        flex-direction: column;
    }
    .planner-col-left {
        width: 100%;
    }
    .planner-col-left .backup-section {
        margin-top: 0;
    }
}