/* AA Literature Study - Main Styles */

/* CSS Custom Properties (Theming) */
:root {
    /* Light Theme (default) */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e0e0e0;
    --text-primary: #212121;
    --text-secondary: #616161;
    --text-muted: #9e9e9e;
    --border-color: #e0e0e0;
    --accent-color: #1976d2;
    --accent-hover: #1565c0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);

    /* Highlight Colors */
    --highlight-yellow: #ffeb3b;
    --highlight-green: #a5d6a7;
    --highlight-blue: #90caf9;
    --highlight-pink: #f48fb1;
    --highlight-orange: #ffcc80;
    --highlight-purple: #ce93d8;

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

    /* Layout */
    --header-height: 48px;
    --sidebar-width: 260px;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --line-height: 1.6;

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

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --text-muted: #707070;
    --border-color: #404040;
    --accent-color: #64b5f6;
    --accent-hover: #42a5f5;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.25);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.4);
}

/* Sepia Theme */
[data-theme="sepia"] {
    --bg-primary: #f4ecd8;
    --bg-secondary: #e8dcc8;
    --bg-tertiary: #d4c8b4;
    --text-primary: #5c4b37;
    --text-secondary: #7a6a56;
    --text-muted: #9a8a76;
    --border-color: #d4c8b4;
    --accent-color: #8b6914;
    --accent-hover: #704f0f;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow: hidden;
}

/* App Container */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--spacing-md);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-center {
    flex: 1;
    max-width: 500px;
    margin: 0 var(--spacing-lg);
}

.logo {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

/* Search Container */
.search-container {
    display: flex;
    align-items: center;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-xs) var(--spacing-sm);
}

.search-container input {
    flex: 1;
    border: none;
    background: none;
    padding: var(--spacing-xs);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    outline: none;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

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

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

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: none;
    border: none;
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* Main Container */
.main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    transition: width var(--transition-normal), min-width var(--transition-normal);
    flex-shrink: 0;
}

.sidebar.collapsed {
    width: 0;
    min-width: 0;
    padding: 0;
    border-right: none;
    overflow: hidden;
}

.sidebar-nav {
    padding: var(--spacing-md);
}

.nav-section {
    margin-bottom: var(--spacing-lg);
}

.nav-section-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
}

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

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 6px;
    transition: all var(--transition-fast);
    cursor: pointer;
}

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

.nav-item.active {
    background-color: var(--accent-color);
    color: white;
}

.nav-item svg {
    flex-shrink: 0;
}

/* Book Tree */
.book-item {
    margin-bottom: var(--spacing-xs);
}

.book-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.book-header:hover {
    background-color: var(--bg-tertiary);
}

.book-header.expanded .expand-icon {
    transform: rotate(90deg);
}

.expand-icon {
    transition: transform var(--transition-fast);
}

.book-chapters {
    display: none;
    padding-left: var(--spacing-lg);
}

.book-chapters.visible {
    display: block;
}

.chapter-item {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.chapter-item.active {
    color: var(--accent-color);
    font-weight: 500;
}

/* Chapter Section Headers (for Big Book) */
.chapter-section-header {
    padding: var(--spacing-sm) var(--spacing-xs);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.chapter-section-header:first-child {
    margin-top: 0;
    border-top: none;
}

.chapter-subsection-header {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: var(--spacing-xs);
}

/* Utilities */
.hidden {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    animation: slideIn var(--transition-normal);
}

.toast.success {
    border-left: 4px solid #4caf50;
}

.toast.error {
    border-left: 4px solid #f44336;
}

.toast.info {
    border-left: 4px solid var(--accent-color);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

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

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

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

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

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

.modal {
    background-color: var(--bg-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

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

.modal-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

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

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.form-hint {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.selected-text-preview {
    background-color: var(--bg-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 6px;
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    border-left: 3px solid var(--accent-color);
}

/* Settings Modal Specific */
#font-size-value {
    display: inline-block;
    min-width: 50px;
    text-align: center;
    font-weight: 500;
    color: var(--accent-color);
}

/* Keyboard Shortcuts */
.shortcuts-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.shortcut-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.shortcut-item kbd {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-family: var(--font-mono);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    min-width: 28px;
    text-align: center;
}

.shortcut-item span {
    color: var(--text-secondary);
}

/* Desktop-only layout - no mobile breakpoints needed */