/**
 * orthodox-resources.com Stylesheet
 * 
 * Table of Contents:
 * 1. CSS Variables (colors, fonts, spacing) - Dark & Light themes
 * 2. Reset & Base Styles
 * 3. Layout (header, sidebar, main, footer)
 * 4. Navigation
 * 5. Typography
 * 6. Source Cards & Citations
 * 7. Drop Caps
 * 8. Footnotes (expandable)
 * 9. Breadcrumbs
 * 10. Previous/Next Navigation
 * 11. Index/About Page
 * 12. 404 Page
 * 13. Mobile Responsive
 * 14. Utility Classes
 * 15. Theme Toggle
 */

/* ==========================================================================
   1. CSS Variables - Dark Theme (Default)
   ========================================================================== */

:root {
    /* Colors - Dark Theme */
    --bg-primary: #0c0c0c;
    --bg-surface: #141414;
    --bg-elevated: #1e1e1e;
    --bg-note: #1a1a1a;
    
    --border-default: #2a2a2a;
    --border-light: #3a3a3a;
    
    --text-primary: #ffffff;
    --text-muted: #9a9a9a;
    --text-dim: #666666;
    
    --accent: #b22013;
    --accent-light: #ff1905;
    --accent-dim: #7a1a10;
    
    /* Fonts */
    --font-serif: 'Crimson Pro', Georgia, serif;
    --font-display: 'Cinzel', serif;
    --font-sans: 'DM Sans', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 20px;
    --spacing-lg: 35px;
    --spacing-xl: 50px;
    
    /* Sizing */
    --sidebar-width: 280px;
    --content-max-width: 600px;
    --header-height: 70px;
}

/* ==========================================================================
   Light Theme
   ========================================================================== */

[data-theme="light"] {
    --bg-primary: #f5f5f5;
    --bg-surface: #ffffff;
    --bg-elevated: #fafafa;
    --bg-note: #f0f0f0;
    
    --border-default: #e0e0e0;
    --border-light: #d0d0d0;
    
    --text-primary: #1a1a1a;
    --text-muted: #555555;
    --text-dim: #888888;
    
    --accent: #8b1a10;
    --accent-light: #b22013;
    --accent-dim: #5a1008;
}

/* Light mode specific overrides */
[data-theme="light"] .note-expandable {
    background: #f0f0f0;
    border-left-color: var(--accent);
}

[data-theme="light"] .note-content {
    color: var(--text-primary);
}

[data-theme="light"] .sidebar-toggle {
    background: var(--bg-surface);
    color: var(--accent);
}

/* ==========================================================================
   2. Reset & Base Styles
   ========================================================================== */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 17px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-serif);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

/* ==========================================================================
   3. Layout
   ========================================================================== */

.site-wrapper {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-surface);
    border-right: 1px solid var(--border-default);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.sidebar-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-default);
    text-align: center;
    position: relative;
}

.site-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--accent);
}

.site-brand-icon {
    width: 100%;
    max-width: 120px;
    height: auto;
    margin-bottom: 4px;
}

.site-brand-text {
    font-family: var(--font-display);
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    line-height: 1.3;
}

/* Force text rendering, not emoji */
.nav-home,
.sidebar-toggle {
    font-variant-emoji: text;
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
}

/* Main Content Area */
.main-wrapper {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: margin-left 0.3s ease;
}

/* When sidebar is hidden */
.sidebar-hidden .main-wrapper {
    margin-left: 0;
}

.main-content {
    flex: 1;
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* Sidebar toggle button */
.sidebar-toggle {
    position: fixed;
    top: var(--spacing-md);
    left: var(--spacing-md);
    z-index: 150;
    width: 40px;
    height: 40px;
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: 1.2rem;
    transition: all 0.2s ease;
}

.sidebar-toggle:hover {
    background: var(--bg-elevated);
    border-color: var(--accent-dim);
}

/* Adjust toggle position when sidebar is visible */
.sidebar-toggle {
    left: calc(var(--sidebar-width) + var(--spacing-md));
}

.sidebar-hidden .sidebar-toggle {
    left: var(--spacing-md);
}

/* Hide sidebar */
.sidebar-hidden .sidebar {
    transform: translateX(-100%);
}

/* Footer */
.site-footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-default);
    padding: var(--spacing-lg);
    margin-left: 0;
    transition: background-color 0.3s ease;
}

.footer-content {
    max-width: var(--content-max-width);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.7;
}

.footer-content p {
    margin-bottom: var(--spacing-sm);
}

.footer-content p:last-child {
    margin-bottom: 0;
}

/* ==========================================================================
   4. Navigation
   ========================================================================== */

.nav-home {
    display: block;
    padding: var(--spacing-sm) var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent);
    background: var(--bg-elevated);
    border-radius: 6px;
    text-align: center;
    transition: all 0.2s ease;
}

.nav-home:hover {
    background: var(--accent-dim);
    color: var(--bg-primary);
}

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

.nav-category {
    font-family: var(--font-sans);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-dim);
    padding: var(--spacing-xs) var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: color 0.2s ease;
}

.nav-category:hover {
    color: var(--text-muted);
}

.nav-category-arrow {
    font-size: 0.6rem;
    transition: transform 0.2s ease;
    transform: rotate(-90deg);
}

.nav-category.expanded .nav-category-arrow {
    transform: rotate(0deg);
}

.nav-items {
    display: none;
    flex-direction: column;
    gap: 1px;
}

.nav-category.expanded + .nav-items {
    display: flex;
}

.nav-item {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    padding-left: var(--spacing-md);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--text-muted);
    border-radius: 5px;
    transition: all 0.2s ease;
}

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

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

/* Nested navigation (sub-subcategories) */
.nav-subitems {
    padding-left: var(--spacing-sm);
}

.nav-subitems .nav-item {
    padding-left: calc(var(--spacing-md) + var(--spacing-sm));
    font-size: 0.82rem;
}

.nav-subitems .nav-category {
    padding-left: var(--spacing-md);
}

.nav-subitems .nav-items {
    padding-left: var(--spacing-sm);
}

/* ==========================================================================
   5. Typography
   ========================================================================== */

.page-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-default);
}

.page-header h1 {
    font-family: var(--font-display);
    font-size: 1.7rem;
    font-weight: 500;
    color: var(--accent-light);
    letter-spacing: 0.04em;
    margin-bottom: var(--spacing-xs);
    text-align: center;
}

.page-meta {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--text-dim);
    letter-spacing: 0.03em;
}

h2, .chapter-heading {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: 0.05em;
    margin: var(--spacing-lg) 0 var(--spacing-md) 0;
}

h2:first-of-type,
.chapter-heading:first-of-type {
    margin-top: 0;
}

p {
    margin-bottom: 1.2em;
    text-align: justify;
}

p:last-child {
    margin-bottom: 0;
}

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

em, i {
    font-style: italic;
}

.greek {
    font-style: italic;
    color: var(--text-primary);
}

/* ==========================================================================
   6. Source Cards & Citations
   ========================================================================== */

.source-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.source-header {
    background: var(--accent-dim);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.source-icon {
    width: 36px;
    height: 36px;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--accent);
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: white;
}

.source-citation-header {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: white;
    line-height: 1.5;
    opacity: 0.9;
}

.source-body {
    padding: var(--spacing-lg) var(--spacing-md);
}

/* Inline citations */
.citation {
    display: inline;
    font-family: var(--font-sans);
    font-size: 0.82rem;
    color: var(--text-muted);
    background: var(--bg-elevated);
    padding: 4px 10px;
    border-radius: 4px;
    border-left: 2px solid var(--accent-dim);
    margin: 0 4px;
}

/* ==========================================================================
   7. Drop Caps
   ========================================================================== */

.drop-cap::first-letter {
    float: left;
    font-family: var(--font-display);
    font-size: 3.5rem;
    line-height: 0.85;
    padding-right: 10px;
    padding-top: 6px;
    color: var(--accent);
    font-weight: 500;
}

/* Illuminated style (subtle) */
.drop-cap-illuminated {
    float: left;
    font-family: var(--font-display);
    font-size: 3.5rem;
    line-height: 0.85;
    padding-right: 10px;
    padding-top: 6px;
    color: var(--accent);
    font-weight: 500;
}

/* ==========================================================================
   7b. Prayer Blocks
   ========================================================================== */

.prayer-block {
    margin: var(--spacing-lg) 50px;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--accent);
    border-radius: 6px;
    background: var(--bg-surface);
}

.prayer-block p {
    text-align: left;
    margin-bottom: var(--spacing-sm);
}

.prayer-block p:last-child {
    margin-bottom: 0;
}

/* Light mode adjustment */
[data-theme="light"] .prayer-block {
    background: var(--bg-elevated);
}

/* ==========================================================================
   8. Footnotes (expandable)
   ========================================================================== */

.note-trigger {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-family: var(--font-sans);
    font-size: 0.72rem;
    color: var(--accent);
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    padding: 4px 10px;
    border-radius: 4px;
    cursor: pointer;
    margin-left: 6px;
    transition: all 0.2s ease;
    vertical-align: middle;
}

.note-trigger:hover {
    background: var(--accent-dim);
    color: white;
    border-color: var(--accent-dim);
}

.note-trigger.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.note-trigger .arrow {
    font-size: 0.6rem;
    transition: transform 0.2s ease;
}

.note-trigger.active .arrow {
    transform: rotate(180deg);
}

.note-expandable {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, margin 0.3s ease, padding 0.3s ease;
    background: #1a1a1a;
    border-left: 3px solid var(--accent);
    border-radius: 0 6px 6px 0;
    margin: 0;
}

.note-expandable.open {
    max-height: 3000px;
    margin: var(--spacing-md) 0;
    padding: var(--spacing-md) var(--spacing-md);
}

.note-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-default);
}

.note-number {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent);
    background: var(--bg-surface);
    padding: 4px 10px;
    border-radius: 3px;
}

.note-content {
    font-size: 1.1rem;
    line-height: 1.5;
    color: var(--text-primary);
}

.note-content p {
    margin-bottom: var(--spacing-sm);
    text-align: left;
}

.note-content p:last-child {
    margin-bottom: 0;
}

/* Footnote citation (within footnote) */
.footcite {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--text-dim);
    font-style: italic;
}

/* Subpoints within footnotes */
.subpoint {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-surface);
    border-radius: 5px;
}

.subpoint-label {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.78rem;
    color: var(--accent-dim);
    margin-bottom: 6px;
}

/* ==========================================================================
   9. Breadcrumbs
   ========================================================================== */

.breadcrumbs {
    font-family: var(--font-sans);
    font-size: 0.78rem;
    color: var(--text-dim);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
}

.breadcrumbs a {
    color: var(--text-muted);
}

.breadcrumbs a:hover {
    color: var(--accent);
}

.breadcrumbs-separator {
    color: var(--border-light);
}

.breadcrumbs-current {
    color: var(--accent-dim);
}

/* ==========================================================================
   10. Previous/Next Navigation
   ========================================================================== */

.page-nav {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-default);
}

.page-nav-link {
    flex: 1;
    max-width: 45%;
    padding: var(--spacing-md);
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: 6px;
    transition: all 0.2s ease;
    text-decoration: none;
}

.page-nav-link:hover {
    border-color: var(--accent-dim);
    background: var(--bg-elevated);
}

.page-nav-link--prev {
    text-align: left;
}

.page-nav-link--next {
    text-align: right;
    margin-left: auto;
}

.page-nav-label {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 4px;
}

.page-nav-title {
    font-family: var(--font-serif);
    font-size: 0.95rem;
    color: var(--accent);
}

/* ==========================================================================
   11. Index/About Page
   ========================================================================== */

.index-hero {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-default);
}

.index-hero-icon {
    width: 300px;
    height: auto;
    margin-bottom: var(--spacing-md);
}

.index-hero h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 500;
    color: var(--accent-light);
    letter-spacing: 0.06em;
    margin-bottom: var(--spacing-xs);
}

.index-hero-tagline {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--text-muted);
}

.about-content {
    font-size: 1.05rem;
    line-height: 1.85;
}

.about-content h2 {
    margin-top: var(--spacing-xl);
}

.contact-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-default);
}

.contact-section h2 {
    margin-top: 0;
}

/* ==========================================================================
   12. 404 Page
   ========================================================================== */

.error-page {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.error-code {
    font-family: var(--font-display);
    font-size: 5rem;
    font-weight: 600;
    color: var(--accent);
    line-height: 1;
    margin-bottom: var(--spacing-md);
}

.error-message {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

.error-link {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent-dim);
    color: white;
    border-radius: 6px;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.2s ease;
}

.error-link:hover {
    background: var(--accent);
    color: white;
}

/* ==========================================================================
   13. Mobile Responsive
   ========================================================================== */

@media (max-width: 900px) {
    :root {
        --sidebar-width: 260px;
    }

    html {
        font-size: 16px;
    }

    .sidebar-toggle {
        left: var(--spacing-md) !important;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-wrapper {
        margin-left: 0 !important;
    }

    .main-content {
        padding: calc(var(--spacing-xl) + 44px) var(--spacing-md) var(--spacing-xl);
    }

    .page-header h1 {
        font-size: 1.4rem;
    }

    .page-nav {
        flex-direction: column;
    }

    .page-nav-link {
        max-width: 100%;
    }

    .page-nav-link--next {
        text-align: left;
    }

    /* Overlay when menu is open */
    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.6);
        z-index: 50;
    }

    .sidebar-overlay.open {
        display: block;
    }
}

@media (max-width: 500px) {
    .main-content {
        padding: calc(var(--spacing-xl) + 44px) var(--spacing-sm) var(--spacing-lg);
    }

    .breadcrumbs {
        font-size: 0.7rem;
    }

    .index-hero h1 {
        font-size: 1.5rem;
    }

    .index-hero-icon {
        width: 200px;
    }

    .site-brand {
        flex-direction: column;
        align-items: center;
    }

    .site-brand-icon {
        max-width: 100px;
    }

    .drop-cap-illuminated {
        font-size: 2.5rem;
    }
}

/* ==========================================================================
   14. Utility Classes
   ========================================================================== */

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

.text-center {
    text-align: center;
}

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

.mt-lg {
    margin-top: var(--spacing-lg);
}

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

/* ==========================================================================
   15. Theme Toggle (in sidebar)
   ========================================================================== */

.theme-toggle {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 32px;
    height: 32px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    background: var(--accent-dim);
    border-color: var(--accent-dim);
}

/* Sun icon for dark mode, moon for light */
.theme-toggle::before {
    content: "☀";
}

[data-theme="light"] .theme-toggle::before {
    content: "☽";
}

/* ==========================================================================
   16. EPUB Download Links
   ========================================================================== */

.epub-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.epub-links-top {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-default);
}

.epub-links-bottom {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-default);
}

.epub-links-label {
    display: none;
}

.epub-link {
    flex: 1;
    max-width: 250px;
    padding: var(--spacing-md);
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: 6px;
    color: var(--accent);
    text-decoration: none;
    text-align: center;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.epub-link:hover {
    border-color: var(--accent-dim);
    background: var(--bg-elevated);
}

.epub-link::before {
    content: "↓ ";
}

/* ==========================================================================
   Scrollbar Styling
   ========================================================================== */

::-webkit-scrollbar {
    width: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}