/* ============================================
   OPEN NOTEBOOK - Modern Clean Design
   ============================================ */

/* CSS Custom Properties */
:root {
    /* Colors - Modern Clean Palette */
    --bg-primary: #ffffff;
    --bg-secondary: #f7f9fc;
    --bg-tertiary: #f0f4f8;
    --bg-hover: #e8f0fe;

    /* Text colors */
    --text-primary: #1a1a2e;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --text-light: #a0aec0;
    --ink-light: #cbd5e0;
    --ink-muted: #718096;

    /* Accent Colors - WeChat Green Gradient */
    --accent-primary: #07c160;
    --accent-secondary: #06ae56;
    --accent-gradient: linear-gradient(135deg, #07c160 0%, #06ae56 100%);
    --accent-light: #e8f7ef;
    --accent-glow: rgba(7, 193, 96, 0.15);

    /* Semantic Colors */
    --accent-red: #ef4444;
    --accent-green: #07c160;
    --accent-amber: #f59e0b;

    /* Borders */
    --border-thin: 1px solid #e2e8f0;
    --border-medium: 1px solid #cbd5e0;
    --border-color: #e2e8f0;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;
    --space-2xl: 32px;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-serif: 'Crimson Pro', Georgia, serif;
    --font-mono: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
    --font-display: 'Space Mono', 'Courier New', monospace;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);

    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

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

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

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, #f5f7fa 0%, #e8f0fe 100%);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
}

/* Layout */
.app-container {
    display: flex !important;
    flex-direction: column !important;
    height: 100vh !important;
    overflow: hidden !important;
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-xl);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

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

.logo-mark {
    width: 40px;
    height: 40px;
    color: var(--accent-primary);
    background: var(--accent-light);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
}

.logo-type {
    display: flex;
    flex-direction: column;
}

.logo-name {
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--text-primary);
}

.logo-tagline {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

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

.btn-github {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

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

.btn-new-notebook {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: #ffffff;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.btn-new-notebook:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-new-notebook:active {
    transform: translateY(0);
}

/* Main Grid */
.main-grid {
    display: grid;
    grid-template-columns: var(--left-width, 240px) 4px 1fr 4px var(--right-width, 360px);
    flex: 1;
    width: 100%;
    min-height: 0; /* Allow grid to shrink */
    overflow: hidden;
    background: var(--border-color);
    /* Remove transition to fix disappearing panel issue */
    gap: 0;
}

.main-grid.left-collapsed {
    grid-template-columns: 64px 0px 1fr 4px var(--right-width, 360px);
}

.main-grid.right-collapsed {
    grid-template-columns: var(--left-width, 240px) 4px 1fr 0px 64px;
}

.main-grid.left-collapsed.right-collapsed {
    grid-template-columns: 64px 0px 1fr 0px 64px;
}

.studio-header {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border-bottom: none;
    min-height: 60px;
}

/* Left Panel Collapsed State Fixes */
.main-grid.left-collapsed .panel-left {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    width: 64px !important;
    min-width: 64px !important;
    padding: 0 !important;
    background: var(--bg-primary) !important;
    border-right: 1px solid var(--border-color);
    overflow: visible;
}

.main-grid.left-collapsed .panel-left .panel-header {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: flex-start !important;
    padding: var(--space-md) 0 !important;
    width: 100% !important;
    border-bottom: none !important;
    min-height: 60px;
}

.main-grid.left-collapsed .panel-left .panel-header .panel-title,
.main-grid.left-collapsed .sources-list-container {
    display: none !important;
}

.main-grid.left-collapsed .panel-left .panel-actions {
    display: flex !important;
    flex-direction: column-reverse !important; /* Move btnToggleLeft to the top */
    align-items: center !important;
    gap: var(--space-xl) !important;
    width: 100% !important;
}

.main-grid.left-collapsed #btnToggleLeft {
    transform: rotate(180deg) !important;
    margin: 0 auto !important;
}

.main-grid.left-collapsed #btnAddSource {
    width: 36px !important;
    height: 36px !important;
    background: #ffffff !important;
    border-radius: 50% !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05) !important;
    border: 1px solid var(--border-color) !important;
    margin: 0 auto !important;
    padding: 0 !important;
}

.main-grid.left-collapsed #btnAddSource:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.main-grid.left-collapsed #resizerLeft {
    visibility: hidden;
    pointer-events: none;
    border: none !important;
}

.main-grid.right-collapsed #resizerRight {
    visibility: hidden;
    pointer-events: none;
    border: none !important;
}

.resizer {
    background: var(--bg-primary);
    cursor: col-resize;
    transition: background var(--transition-fast);
    position: relative;
    z-index: 20;
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
}

.resizer:hover, .resizer.dragging {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.resizer::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: -4px;
    right: -4px;
}

.chat-messages-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    background: var(--bg-primary);
}

.btn-toggle-side {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-normal);
    flex-shrink: 0;
}

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

.main-grid.right-collapsed #btnToggleRight {
    transform: rotate(180deg) !important;
}

.main-grid.right-collapsed .panel-right {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    background: var(--bg-primary);
    overflow: visible;
    width: 64px !important;
    padding: 0 !important;
    border-left: 1px solid var(--border-color); /* Add border when resizer is hidden */
}

.main-grid.right-collapsed .studio-header {
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    padding: var(--space-md) 0;
    width: 100% !important;
}

.main-grid.right-collapsed .panel-right .studio-header .panel-title,
.main-grid.right-collapsed .transform-custom-pill,
.main-grid.right-collapsed .section-notes,
.main-grid.right-collapsed .transform-card span {
    display: none;
}

.main-grid.right-collapsed .transform-grid {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    gap: var(--space-md);
    padding: 0 !important;
    width: 100% !important;
}

.main-grid.right-collapsed .transform-card {
    width: 44px !important;
    height: 44px !important;
    padding: 0 !important;
    margin: 0 auto !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    border-radius: 50% !important;
    background: transparent !important;
}

.main-grid.right-collapsed .transform-icon {
    width: 36px;
    height: 36px;
    font-size: 1.1rem;
    box-shadow: var(--shadow-sm);
}

.workspace-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.workspace-section {
    padding-top: var(--space-xl);
    padding-bottom: var(--space-md);
    border-bottom: none;
}

.studio-header .panel-title {
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 800;
}

.transform-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.transform-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: var(--space-md);
    height: 72px;
    gap: 6px;
    border-radius: var(--radius-md);
    border: none !important; /* Force remove borders */
    cursor: pointer;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.transform-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.transform-icon {
    width: 28px;
    height: 28px;
    background: #ffffff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    box-sizing: border-box;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.transform-icon svg {
    color: inherit;
    width: 16px;
    height: 16px;
}

.transform-card span {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 700;
}

/* Precise Colors from Studio.png */
.transform-card[data-type="summary"] { background-color: #e9f7ef !important; color: #1b5e20 !important; }
.transform-card[data-type="faq"] { background-color: #fdf2f2 !important; color: #b71c1c !important; }
.transform-card[data-type="study_guide"] { background-color: #eef2ff !important; color: #1a237e !important; }
.transform-card[data-type="outline"] { background-color: #fffbeb !important; color: #7f4d00 !important; }
.transform-card[data-type="podcast"] { background-color: #f5f3ff !important; color: #4a148c !important; }
.transform-card[data-type="timeline"] { background-color: #e0f7f6 !important; color: #004d40 !important; }
.transform-card[data-type="glossary"] { background-color: #fff7ed !important; color: #e65100 !important; }
.transform-card[data-type="quiz"] { background-color: #f7fee7 !important; color: #33691e !important; }
.transform-card[data-type="mindmap"] { background-color: #f0f9ff !important; color: #0369a1 !important; }

.transform-custom-pill {
    display: flex;
    align-items: center;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 2px 4px 2px 16px;
    margin-top: var(--space-lg);
    transition: border-color var(--transition-normal);
}

.transform-custom-pill:focus-within {
    border-color: var(--accent-primary);
}

.transform-custom-pill input {
    flex: 1;
    border: none;
    background: transparent;
    padding: var(--space-sm) 0;
    font-size: 0.85rem;
    outline: none;
}

.transform-custom-pill button {
    background: transparent;
    border: none;
    color: var(--accent-primary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 600;
    padding: var(--space-sm) var(--space-lg);
    cursor: pointer;
}

.transform-custom-pill button:hover {
    opacity: 0.8;
}

.section-notes {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    border-top: 1px solid var(--border-color);
    margin-top: var(--space-xl);
}

.section-notes .panel-header {
    padding-top: var(--space-xl);
}

.notes-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 var(--space-xl) var(--space-xl) var(--space-xl);
}

.note-item {
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--accent-primary);
}

/* Panel Base */
.panel {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-primary);
}

.panel-left {
    background: var(--bg-secondary);
}

.panel-center {
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    min-width: 300px; /* Ensure a minimum width for the chat area */
    height: 100%;
    z-index: 1;
}

.chat-messages-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    background: var(--bg-primary);
    position: relative;
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-lg);
    background: var(--bg-primary);
}

.panel-right {
    background: var(--bg-secondary);
}

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

.panel-title {
    font-family: var(--font-display);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--text-secondary);
}

.panel-count {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    padding: 2px 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

.panel-actions {
    display: flex;
    gap: var(--space-sm);
}

/* Buttons */
.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.btn-text {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent-primary);
    background: none;
    border: none;
    cursor: pointer;
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

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

.btn-secondary {
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.btn-primary {
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: #ffffff;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    box-shadow: var(--shadow-md), var(--shadow-glow);
    transform: translateY(-1px);
}

.btn-close {
    width: 28px;
    height: 28px;
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--text-muted);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color var(--transition-fast);
}

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

/* Notebook List */
.notebook-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
}

.notebook-item {
    position: relative;
    padding: var(--space-md);
    margin-bottom: var(--space-sm);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.notebook-item:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.notebook-item.active {
    border-color: var(--accent-primary);
    background: var(--accent-light);
    box-shadow: var(--shadow-md);
}

.notebook-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xs);
}

.notebook-icon {
    color: var(--accent-primary);
    flex-shrink: 0;
}

.notebook-name {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.notebook-meta {
    display: flex;
    gap: var(--space-md);
    padding-left: 24px;
}

.notebook-sources,
.notebook-notes {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
}

.btn-delete-notebook {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    width: 20px;
    height: 20px;
    color: var(--text-light);
    background: transparent;
    border: none;
    cursor: pointer;
    opacity: 1;
    transition: all var(--transition-fast);
}

.btn-delete-notebook:hover {
    color: var(--accent-red);
}

/* Sources Grid */
.sources-list-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
}

.source-card {
    position: relative;
    padding: var(--space-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: 4px;
    border-left: 4px solid var(--accent-primary); /* Default color bar */
}

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

.source-card[data-type="file"] { border-left-color: #ef4444; }
.source-card[data-type="url"] { border-left-color: #3b82f6; }
.source-card[data-type="text"] { border-left-color: #10b981; }

.source-type-badge {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    font-family: var(--font-display);
    font-size: 0.55rem;
    font-weight: 800;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.source-icon {
    display: none; /* Hide large icon in compact list */
}

.source-name {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    padding-right: 40px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.source-details-row {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.source-meta {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
}

.source-chunks {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-family: var(--font-mono);
    font-size: 0.6rem;
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    width: fit-content;
    color: var(--text-secondary);
}

.chunk-count {
    font-weight: 700;
}

.btn-remove-source {
    position: absolute;
    bottom: var(--space-sm);
    right: var(--space-sm);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: transparent;
    border: none;
    color: var(--text-light);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 1;
    transition: all var(--transition-fast);
}

.btn-remove-source:hover {
    background: #fee2e2;
    color: var(--accent-red);
}

/* Panel Tabs */
.panel-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    gap: var(--space-md);
    padding: 0 var(--space-md);
}

.tab-btn {
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}

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

.tab-btn.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

.tab-btn .tab-close {
    margin-left: 8px;
    font-size: 14px;
    opacity: 0.6;
    transition: opacity var(--transition-fast);
}

.tab-btn .tab-close:hover {
    opacity: 1;
    color: var(--accent-red);
}

.tab-btn[data-tab="note"],
.tab-btn[data-tab="notes_list"] {
    display: none;
}

.tab-btn[data-tab="note"].active,
.tab-btn[data-tab="notes_list"].active,
.tab-btn[data-tab="notes_list"]:not(.hidden) {
    display: flex;
}

.tab-btn.hidden {
    display: none !important;
}

.tab-content {
    display: none;
    flex: 1;
    overflow: hidden;
}

/* Notes Grid in Center Panel */
.notes-details-view {
    display: none;
    flex-direction: column;
    height: 100%;
    background: var(--bg-secondary);
    padding: var(--space-xl);
    overflow-y: auto;
}

.notes-compact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-lg);
    width: 100%;
}

.compact-note-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: 8px;
    position: relative;
    border-left: 4px solid var(--accent-primary);
}

.btn-delete-compact-note {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    width: 20px;
    height: 20px;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--text-light);
    cursor: pointer;
    opacity: 1;
    transition: all var(--transition-fast);
    border-radius: var(--radius-full);
}

.btn-delete-compact-note:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-red);
}

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

.compact-note-card .note-type {
    font-size: 0.6rem;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 700;
}

.compact-note-card .note-title {
    font-size: 0.9rem;
    font-weight: 600;
    margin: 0;
    padding: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.compact-note-card .note-preview {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin: 0;
}

.compact-note-card .note-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 4px;
    font-size: 0.65rem;
    color: var(--text-light);
}

.tab-content.active {
    display: flex;
    flex-direction: column;
}

/* Notes List */
.notes-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
}

/* Infographic Styles */
.infographic-container {
    margin: 1.5rem 0;
    padding: var(--space-md);
    background: #ffffff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.infographic-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    cursor: zoom-in;
    transition: transform var(--transition-normal);
}

.infographic-image:hover {
    transform: scale(1.01);
}

/* PPT Viewer Styles */
.ppt-viewer-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin: 1.5rem 0;
    box-shadow: var(--shadow-lg);
}

.ppt-slides-wrapper {
    width: 100%;
    height: 100%;
    position: relative;
}

.ppt-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    align-items: center;
    justify-content: center;
}

.ppt-slide.active {
    display: flex;
}

.ppt-slide img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.ppt-slide-counter {
    position: absolute;
    bottom: var(--space-md);
    right: var(--space-md);
    background: rgba(0, 0, 0, 0.5);
    color: white;
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

.ppt-controls {
    position: absolute;
    top: 50%;
    width: 100%;
    display: flex;
    justify-content: space-between;
    transform: translateY(-50%);
    padding: 0 var(--space-md);
    pointer-events: none;
}

.btn-ppt-nav {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(4px);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    pointer-events: auto;
}

.btn-ppt-nav:hover {
    background: rgba(255, 255, 255, 0.4);
    transform: scale(1.1);
}

.infographic-actions {
    display: flex;
    justify-content: center;
    width: 100%;
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border-color);
}

.transform-card[data-type="infograph"] { background-color: #fef2f2 !important; color: #991b1b !important; }
.transform-card[data-type="ppt"] { background-color: #fff7ed !important; color: #9a3412 !important; }
.transform-card[data-type="insight"] { background-color: #f3e8ff !important; color: #6b21a8 !important; }

/* 定义角度变量，用于平滑动画 */
@property --gradient-angle {
    syntax: '<angle>';
    initial-value: 0deg;
    inherits: false;
}

.transform-card.loading,
#btnCustomTransform.loading {
    pointer-events: none;
    position: relative;
    z-index: 1;
}

.transform-card.loading::after,
#btnCustomTransform.loading::after {
    content: '';
    position: absolute;
    inset: -2px; 
    padding: 2px; 
    border-radius: inherit;
    /* 使用 currentColor 自动匹配同色系深色，并增加尾部渐变 */
    background: conic-gradient(
        from var(--gradient-angle), 
        transparent 0% 75%, 
        currentColor 100%
    );
    -webkit-mask: 
        linear-gradient(#fff 0 0) content-box, 
        linear-gradient(#fff 0 0);
    mask: 
        linear-gradient(#fff 0 0) content-box, 
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    animation: snake-rotate 1.5s linear infinite;
    z-index: 2;
}

@keyframes snake-rotate {
    from { --gradient-angle: 0deg; }
    to { --gradient-angle: 360deg; }
}

.note-item.placeholder {
    border-left: 4px solid var(--text-light);
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    animation: placeholder-shimmer 2s ease-in-out infinite;
    position: relative;
    overflow: hidden;
}

.note-item.placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.6), transparent);
    transform: translateX(-100%);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    100% { transform: translateX(100%); }
}

@keyframes placeholder-shimmer {
    0%, 100% { border-left-color: var(--text-light); }
    50% { border-left-color: var(--accent-primary); }
}

.note-item {
    position: relative;
    padding: var(--space-md);
    margin-bottom: var(--space-md);
    background: var(--paper-bg);
    border: var(--border-thin);
    border-left: 3px solid var(--ink-light);
}

.note-item:hover {
    border-left-color: var(--ink-muted);
}

.note-type-badge {
    display: none;
}

.note-title {
    font-family: var(--font-serif);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--ink-primary);
    margin-bottom: var(--space-sm);
}

.note-preview {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-height: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
}

/* ============================================
   MARKDOWN RENDERING STYLES
   ============================================ */

.markdown-content {
    font-family: var(--font-serif);
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    font-family: var(--font-sans);
    font-weight: 600;
    margin-top: 1.5em;
    margin-bottom: 0.75em;
    line-height: 1.3;
}

.markdown-content h1 {
    font-size: 1.75rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5em;
}

.markdown-content h2 {
    font-size: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.4em;
}

.markdown-content h3 {
    font-size: 1.25rem;
}

.markdown-content h4 {
    font-size: 1.1rem;
}

.markdown-content h5 {
    font-size: 1rem;
}

.markdown-content h6 {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.markdown-content p {
    margin-bottom: 1em;
}

.markdown-content a {
    color: var(--accent-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all var(--transition-fast);
}

.markdown-content a:hover {
    color: var(--accent-secondary);
    border-bottom-color: var(--accent-secondary);
}

.markdown-content strong,
.markdown-content b {
    font-weight: 600;
    color: var(--text-primary);
}

.markdown-content em,
.markdown-content i {
    font-style: italic;
}

.markdown-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--bg-tertiary);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    color: var(--accent-primary);
}

.markdown-content pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    overflow-x: auto;
    margin-bottom: 1em;
}

.markdown-content pre code {
    background: transparent;
    padding: 0;
    color: var(--text-primary);
    font-size: 0.85rem;
    line-height: 1.6;
}

.markdown-content ul,
.markdown-content ol {
    padding-left: 1.5em;
    margin-bottom: 1em;
}

.markdown-content li {
    margin-bottom: 0.5em;
}

.markdown-content li > ul,
.markdown-content li > ol {
    margin-bottom: 0;
}

.markdown-content ul li {
    list-style-type: disc;
}

.markdown-content ul li ul li {
    list-style-type: circle;
}

.markdown-content ul li ul li ul li {
    list-style-type: square;
}

.markdown-content ol li {
    list-style-type: decimal;
}

.markdown-content blockquote {
    border-left: 4px solid var(--accent-primary);
    padding-left: var(--space-md);
    margin: 1em 0;
    color: var(--text-secondary);
    background: var(--accent-light);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: var(--space-sm) var(--space-md);
}

.markdown-content blockquote p {
    margin-bottom: 0;
}

.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1em;
    font-size: 0.9rem;
}

.markdown-content table thead {
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--border-color);
}

.markdown-content table th {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
}

.markdown-content table td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border-color);
}

.markdown-content table tbody tr:hover {
    background: var(--bg-secondary);
}

.markdown-content table tbody tr:last-child td {
    border-bottom: none;
}

.markdown-content hr {
    border: none;
    border-top: 2px solid var(--border-color);
    margin: 2em 0;
}

.markdown-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 1em 0;
}

.mermaid-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    margin: 1.5em 0;
    padding: var(--space-md);
    background: #ffffff;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    overflow: auto;
    max-height: 85vh;
    box-sizing: border-box;
}

.mermaid-diagram svg {
    display: block;
    max-width: 100%;
    height: auto;
}

.markdown-content dl {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-sm) var(--space-md);
    margin-bottom: 1em;
}

.markdown-content dt {
    font-weight: 600;
    color: var(--text-primary);
}

.markdown-content dd {
    color: var(--text-secondary);
}

.markdown-content details {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-bottom: 1em;
}

.markdown-content details summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--accent-primary);
    user-select: none;
}

.markdown-content details[open] summary {
    margin-bottom: var(--space-sm);
}

.markdown-content .task-list-item {
    list-style-type: none;
}

.markdown-content .task-list-item input {
    margin-right: var(--space-sm);
    accent-color: var(--accent-primary);
}

.note-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--ink-light);
}

.note-date {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--ink-muted);
}

.note-sources {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--ink-light);
}

.btn-delete-note {
    position: absolute;
    bottom: var(--space-sm);
    right: var(--space-sm);
    color: var(--ink-light);
    background: transparent;
    border: none;
    cursor: pointer;
    opacity: 1;
    transition: all var(--transition-fast);
}

.btn-delete-note:hover {
    color: var(--accent-red);
}

/* Chat */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-lg);
}

.chat-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--text-muted);
}

.chat-welcome svg {
    margin-bottom: var(--space-md);
    opacity: 0.4;
}

.chat-welcome h3 {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.chat-welcome p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.chat-message {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    animation: messageIn 0.3s ease;
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-avatar {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    border-radius: var(--radius-lg);
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.chat-message[data-role="user"] {
    flex-direction: row-reverse;
}

.chat-message[data-role="user"] .message-avatar {
    background: var(--accent-gradient);
    color: #ffffff;
    box-shadow: var(--shadow-md);
}

.chat-message[data-role="assistant"] .message-avatar {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.message-content {
    flex: 1;
    max-width: 85%;
    display: flex;
    flex-direction: column;
}

.chat-message[data-role="user"] .message-content {
    align-items: flex-end;
}

.chat-message[data-role="assistant"] .message-content {
    align-items: flex-start;
}

.message-text {
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-lg);
    width: fit-content;
    word-break: break-word;
}

/* Markdown in chat messages */
.message-text p {
    margin-bottom: 0.5em;
}

.message-text p:last-child {
    margin-bottom: 0;
}

.message-text code {
    font-family: var(--font-mono);
    font-size: 0.8em;
    background: rgba(0, 0, 0, 0.1);
    padding: 0.15em 0.35em;
    border-radius: 3px;
}

.chat-message[data-role="user"] .message-text code {
    background: rgba(255, 255, 255, 0.2);
}

.message-text pre {
    background: rgba(0, 0, 0, 0.05);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    overflow-x: auto;
    margin: 0.5em 0;
}

.chat-message[data-role="user"] .message-text pre {
    background: rgba(255, 255, 255, 0.15);
}

.message-text pre code {
    background: transparent;
    padding: 0;
}

.message-text ul,
.message-text ol {
    margin: 0.5em 0;
    padding-left: 1.2em;
}

.message-text li {
    margin-bottom: 0.25em;
}

.message-text strong {
    font-weight: 600;
}

.message-text a {
    color: inherit;
    text-decoration: underline;
}

.chat-message[data-role="user"] .message-text {
    background: var(--accent-gradient);
    color: #ffffff;
    border-bottom-right-radius: 4px;
    box-shadow: var(--shadow-sm);
}

.chat-message[data-role="assistant"] .message-text {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
}

.message-text p {
    margin-bottom: var(--space-sm);
}

.message-text p:last-child {
    margin-bottom: 0;
}

.message-sources {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--ink-light);
}

.chat-message[data-role="user"] .message-sources {
    justify-content: flex-end;
}

.source-tag {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    padding: 2px 8px;
    background: var(--paper-dark);
    color: var(--ink-muted);
    border-radius: 3px;
}

.chat-input-wrapper {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.chat-form {
    display: flex;
    gap: var(--space-sm);
    align-items: flex-end;
}

.chat-input {
    flex: 1;
    padding: var(--space-md) var(--space-lg);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    outline: none;
    transition: all var(--transition-normal);
}

.chat-input:focus {
    border-color: var(--accent-primary);
    background: var(--bg-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.chat-input::placeholder {
    color: var(--text-light);
}

.btn-send {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    flex-shrink: 0;
}

.btn-send:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

/* Transform */
.transform-options {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
}

.transform-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.transform-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--paper-bg);
    border: var(--border-thin);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.transform-card:hover {
    border-color: var(--ink-muted);
    background: var(--paper-light);
}

.transform-card.loading {
    background: #e8f0f3;
    cursor: not-allowed;
    opacity: 1;
    border: 2px solid var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow), var(--shadow-md);
}

.transform-card.loading .transform-icon {
    animation: pulse-icon 1.5s ease-in-out infinite;
}

.transform-card.loading .transform-icon svg {
    color: var(--accent-primary);
}

.transform-card.loading .hourglass-icon {
    animation: spin 3s linear infinite;
    color: var(--accent-primary);
}

.transform-card.loading .transform-name {
    color: var(--accent-primary);
    font-weight: 700;
}

@keyframes pulse-icon {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.7; }
    100% { transform: scale(1); opacity: 1; }
}

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

.transform-name {
    font-family: var(--font-display);
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--ink-secondary);
}

.transform-custom {
    padding: var(--space-md);
    background: var(--paper-dark);
    border: var(--border-thin);
}

.input-label {
    display: block;
    font-family: var(--font-display);
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--ink-secondary);
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
}

.input-field,
.custom-prompt {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    outline: none;
    transition: all var(--transition-normal);
    resize: vertical;
}

.input-field:focus,
.custom-prompt:focus {
    border-color: var(--accent-primary);
    background: var(--bg-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-field::placeholder,
.custom-prompt::placeholder {
    color: var(--text-light);
}

.input-field.font-mono {
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

.custom-prompt {
    margin-bottom: var(--space-md);
    min-height: 80px;
}

/* Footer */
.app-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
    gap: var(--space-xs);
}

.footer-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
}

.footer-status {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
}

.footer-divider {
    color: var(--text-light);
}

.footer-stats {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-secondary);
}

.footer-credit {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.footer-credit a {
    color: var(--accent-primary);
    text-decoration: none;
}

.footer-credit a:hover {
    text-decoration: underline;
}

/* Empty States */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--ink-muted);
    padding: var(--space-xl);
}

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

.empty-state p {
    font-size: 0.9rem;
    margin-bottom: var(--space-xs);
}

.empty-hint {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--ink-light);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal-backdrop);
    backdrop-filter: blur(4px);
}

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

.modal {
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    display: none;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.modal.active {
    display: flex;
}

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

.modal-header h3 {
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 600;
    flex: 1;
}

.modal-header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.btn-copy-note {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-copy-note:hover {
    color: var(--accent-primary);
    background: var(--bg-hover);
    border-color: var(--accent-primary);
}

.btn-copy-note.copied {
    color: var(--accent-green);
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--accent-green);
}

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

.form-group {
    margin-bottom: var(--space-md);
}

/* Source Tabs */
.source-tabs {
    display: flex;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
    border-bottom: var(--border-thin);
}

.source-tab {
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--ink-muted);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.source-tab:hover {
    color: var(--ink-secondary);
}

.source-tab.active {
    color: var(--ink-primary);
    border-bottom-color: var(--ink-primary);
}

.source-content {
    display: none;
}

.source-content.active {
    display: block;
}

/* Drop Zone */
.drop-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    border: 2px dashed var(--border-color);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent-primary);
    background: var(--accent-light);
}

.drop-zone svg {
    color: var(--accent-primary);
    margin-bottom: var(--space-md);
}

.drop-zone p {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.drop-hint {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(26, 26, 26, 0.9);
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--ink-light);
    border-top-color: var(--paper-bg);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-text {
    margin-top: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--paper-bg);
    letter-spacing: 0.1em;
}

.hidden {
    display: none !important;
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--text-light);
    border-radius: 4px;
    border: 2px solid var(--bg-secondary);
}

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

/* Landing Page */
.landing-page {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-2xl) var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.landing-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: var(--space-2xl);
}

.landing-brand h1 {
    font-family: var(--font-sans);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.landing-brand p {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text-muted);
}

.btn-large {
    padding: var(--space-md) var(--space-2xl);
    font-size: 1rem;
    border-radius: var(--radius-xl);
}

.notebook-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.notebook-card {
    position: relative;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    min-height: 200px;
    box-shadow: var(--shadow-md);
}

.notebook-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent-primary);
}

.notebook-card-icon {
    width: 48px;
    height: 48px;
    color: var(--accent-primary);
    background: var(--accent-light);
    border-radius: var(--radius-lg);
    padding: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.notebook-card-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.notebook-card-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.notebook-card-stats {
    display: flex;
    gap: var(--space-md);
}

.stat-sources,
.stat-notes {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    padding: 2px 10px;
    border-radius: var(--radius-full);
}

.btn-delete-card {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    background: transparent;
    border: none;
    cursor: pointer;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    opacity: 1;
}

.btn-delete-card:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-red);
}

/* Workspace Navigation */
.workspace-container {
    display: flex;
    flex-direction: column;
    flex: 1 1 0%;
    min-height: 0;
    overflow: hidden; /* Prevent pushing footer out */
}

.workspace-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.btn-back {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

.current-notebook-info h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

/* Note View Container */
.note-view-container {
    display: none;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.note-view-container[style*="flex"] {
    display: flex;
}

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

.note-view-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.note-view-type {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-primary);
    background: var(--accent-light);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.note-view-title-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.note-view-actions {
    display: flex;
    gap: var(--space-sm);
}

.note-view-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-xl) var(--space-2xl);
    width: 100%;
    box-sizing: border-box;
}

.markdown-content {
    width: 100%;
}

.note-view-title {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 2px solid var(--border-color);
}

/* Note item selected state */
.note-item.selected {
    border-left-color: var(--accent-primary) !important;
    background: var(--accent-light) !important;
    box-shadow: var(--shadow-md);
}

.note-item.selected .note-title {
    color: var(--accent-primary);
}

/* Responsive - Small Screen */
@media (max-width: 768px) {
    /* Reduce panel min-width to fit all panels */
    .panel-center {
        min-width: 0;
    }

    /* Studio buttons: icon and text on same row */
    .main-grid.right-collapsed .transform-card {
        flex-direction: row !important;
        width: auto !important;
        height: auto !important;
        padding: var(--space-sm) var(--space-md) !important;
        gap: var(--space-sm) !important;
    }

    .main-grid.right-collapsed .transform-card span {
        display: block !important;
        font-size: 0.7rem;
    }

    /* Note cards: hide preview, only show type */
    .compact-note-card .note-preview {
        display: none;
    }

    .compact-note-card {
        padding: var(--space-sm);
    }

    /* Adjust grid to ensure all panels are visible on small screens */
    .main-grid {
        grid-template-columns: 180px 4px 1fr 4px 280px !important;
    }

    .main-grid.left-collapsed {
        grid-template-columns: 54px 0px 1fr 4px 280px !important;
    }

    .main-grid.right-collapsed {
        grid-template-columns: 180px 4px 1fr 0px 54px !important;
    }

    .main-grid.left-collapsed.right-collapsed {
        grid-template-columns: 54px 0px 1fr 0px 54px !important;
    }
}