/* =============================================================================
   Alexandria Press - Stylesheet
   
   Aesthetic: Restrained reverence. Quiet confidence. 
   The content is sovereign. The design is invisible.
   ============================================================================= */

/* -----------------------------------------------------------------------------
   CSS Variables
   ----------------------------------------------------------------------------- */

:root {
    /* Light mode (Parchment) */
    --bg-primary: #F7F4ED;
    --bg-secondary: #FFFDF7;
    --bg-elevated: #FFFFFF;
    --text-primary: #1A1A1A;
    --text-secondary: #4A4A4A;
    --text-tertiary: #757575;
    --border: #E0DCD3;
    --border-subtle: #EBE8E1;
    --accent: #4A4A4A;

    /* Typography */
    --font-serif: 'Lora', serif;
    --font-display: 'Lato', sans-serif;
    --font-sans: 'IBM Plex Sans', -apple-system, sans-serif;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-medium: 300ms ease;
    --transition-slow: 500ms ease;
}

/* Dark mode (Vault) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #121212;
        --bg-secondary: #181818;
        --bg-elevated: #202020;
        --text-primary: #F2F2F2;
        --text-secondary: #CCCCCC;
        --text-tertiary: #999999;
        --border: #333333;
        --border-subtle: #222222;
        --accent: #E0E0E0;
    }
}

/* Manual theme override */
[data-theme="light"] {
    --bg-primary: #F7F4ED;
    --bg-secondary: #FFFDF7;
    --bg-elevated: #FFFFFF;
    --text-primary: #1A1A1A;
    --text-secondary: #4A4A4A;
    --text-tertiary: #757575;
    --border: #E0DCD3;
    --border-subtle: #EBE8E1;
    --accent: #4A4A4A;
}

[data-theme="dark"] {
    --bg-primary: #141414;
    --bg-secondary: #1A1A1A;
    --bg-elevated: #222222;
    --text-primary: #F0EDE8;
    --text-secondary: #B0B0B0;
    --text-tertiary: #808080;
    --border: #2A2A2A;
    --border-subtle: #222222;
    --accent: #C0C0C0;
}

/* -----------------------------------------------------------------------------
   Reset & Base
   ----------------------------------------------------------------------------- */

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

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

body {
    font-family: var(--font-sans);
    font-weight: 500;
    /* Increased weight */
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
}

/* -----------------------------------------------------------------------------
   Typography
   ----------------------------------------------------------------------------- */

h1,
h2,
h3,
h4 {
    font-family: var(--font-serif);
    font-weight: 600;
    /* Semi-Bold */
    line-height: 1.2;
    letter-spacing: -0.01em;
}

h1 {
    font-size: 2.8rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.4rem;
}

p {
    margin-bottom: var(--space-md);
}

a {
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 2px solid var(--border);
    /* Thicker border */
    transition: all var(--transition-fast);
}

a:hover {
    border-color: var(--text-primary);
    background-color: rgba(0, 0, 0, 0.02);
}

/* -----------------------------------------------------------------------------
   Utilities
   ----------------------------------------------------------------------------- */

.hidden {
    display: none !important;
}

/* -----------------------------------------------------------------------------
   Library View
   ----------------------------------------------------------------------------- */

.library {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: var(--space-2xl);
    max-width: 1200px;
    margin: 0 auto;
}

.library-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
    padding-top: var(--space-3xl);
}

.library-title {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.library-tagline {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.library-sub-tagline {
    font-family: var(--font-sans);
    font-size: 0.625rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--text-tertiary);
}

.library-shelf {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-2xl);
    margin-bottom: var(--space-3xl);
}

.library-footer {
    text-align: center;
    padding: var(--space-xl) 0;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* Book Card (Library) */
.book-card {
    display: block;
    border: none;
    background: none;
    cursor: pointer;
    text-align: left;
    transition: transform var(--transition-medium);
}

.book-card:hover {
    transform: translateY(-4px);
}

.book-card-cover {
    aspect-ratio: 1 / 1.5;
    /* More classic book ratio */
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.book-card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.2) 50%, transparent 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--space-lg);
    opacity: 1;
    transition: background var(--transition-medium);
}

.book-card:hover .book-card-overlay {
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, rgba(0, 0, 0, 0.4) 60%, transparent 100%);
}

.book-card-overlay-content {
    transform: translateY(10px);
    transition: transform var(--transition-medium) ease;
}

.book-card:hover .book-card-overlay-content {
    transform: translateY(0);
}

.book-card-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: var(--space-xs);
    line-height: 1.2;
}

.book-card-descriptor {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-md);
    font-family: var(--font-serif);
    font-style: italic;
}

.book-card-button {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: white;
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid rgba(255, 255, 255, 0.5);
    opacity: 0;
    transition: all var(--transition-fast);
}

.book-card:hover .book-card-button {
    opacity: 1;
    border-color: white;
}

/* Cover View styling removed as per requirements */

/* Book View and Grid styling removed as per requirements */

/* -----------------------------------------------------------------------------
   Entry View
   ----------------------------------------------------------------------------- */

.entry-view {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.entry-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    border-bottom: 1px solid var(--border-subtle);
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    z-index: 100;
    height: 72px;
    /* Consistent fixed height */
}

/* Base Nav Button Style */
.nav-btn,
.nav-btn-back,
.nav-btn-contents {
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    height: 44px;
    padding: 0 var(--space-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.nav-btn:hover:not(:disabled),
.nav-btn-back:hover,
.nav-btn-contents:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
    background: var(--bg-elevated);
}

.nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* Specific button tweaks */
.nav-btn-back {
    font-size: 1.25rem;
    width: 44px;
    padding: 0;
}

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

.entry-position {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-tertiary);
    margin-right: var(--space-md);
}

/* Contents Menu */
.contents-trigger {
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: var(--space-xs) var(--space-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.contents-trigger:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.contents-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
    animation: fadeIn var(--transition-fast) ease;
}

.contents-menu {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    width: 100%;
    max-width: 500px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
}

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

.contents-menu-header h2 {
    font-size: 1.25rem;
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.contents-close {
    font-size: 2rem;
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    line-height: 1;
}

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

.contents-menu-links {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-xl);
}

.menu-list {
    list-style: none;
    padding: 0;
}

.menu-list li {
    margin-bottom: var(--space-xs);
}

.menu-list a {
    display: flex;
    align-items: baseline;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-serif);
    font-size: 1.125rem;
    border: none;
    transition: all var(--transition-fast);
}

.menu-list a:hover {
    background: var(--bg-secondary);
    transform: translateX(4px);
}

.menu-list a.active {
    font-weight: 700;
    color: var(--text-primary);
    background: var(--bg-secondary);
}



.menu-divider {
    border: none;
    border-top: 1px solid var(--border-subtle);
    margin: var(--space-lg) 0;
}

.menu-section-title {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    margin-bottom: var(--space-md);
}

.secondary-pages {
    margin-bottom: var(--space-md);
}

.secondary-pages a {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.entry-nav button:hover:not(:disabled) {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.entry-nav button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.entry-content {
    flex: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-xl);
    width: 100%;
}

/* Entry Content Typography */
.entry-content h1 {
    font-size: 2.4rem;
    /* Slightly smaller */
    margin-bottom: var(--space-md);
    /* More spacing */
    font-weight: 600;
}

.entry-content h1+p {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.4rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.entry-content h1+p+blockquote {
    font-size: 1rem;
    color: var(--text-secondary);
    border-left: none;
    padding: 0;
    margin-bottom: var(--space-2xl);
}

.entry-content h2 {
    font-size: 1.4rem;
    /* Only a bit bigger than p (1.25rem) */
    margin-top: var(--space-3xl);
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
    font-weight: 600;
}

.entry-content h3 {
    font-size: 1.25rem;
    /* Match p size but bold */
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-md);
    color: var(--text-primary);
    font-weight: 600;
}

.entry-content p {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    /* Large, readable text */
    font-weight: 400;
    /* Lora looks great at 400 with 18px base */
    line-height: 1.6;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.entry-content hr {
    border: none;
    border-top: 1px solid var(--border-subtle);
    margin: var(--space-2xl) 0;
}

.entry-content em {
    font-style: italic;
}

.entry-content strong {
    font-weight: 600;
}

.entry-content ul,
.content-page-content ul {
    list-style-type: disc;
    padding-left: var(--space-xl);
    margin-bottom: var(--space-md);
}

.entry-content ol,
.content-page-content ol {
    list-style-type: decimal;
    padding-left: var(--space-xl);
    margin-bottom: var(--space-md);
}

.entry-content li,
.content-page-content li {
    margin-bottom: var(--space-sm);
    padding-left: var(--space-xs);
}

.entry-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2xl) var(--space-xl) calc(var(--space-2xl) * 2);
    border-top: 1px solid var(--border-subtle);
    max-width: 680px;
    margin: var(--space-2xl) auto 0;
    width: 100%;
}

.entry-footer .nav-btn {
    min-width: 120px;
}

/* -----------------------------------------------------------------------------
   Content Page View (Introduction, Appendix, Colophon)
   ----------------------------------------------------------------------------- */

.content-page-view {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.content-page-header {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--border-subtle);
}

.content-page-header h1 {
    font-size: 1.25rem;
}

.content-page-content {
    flex: 1;
    max-width: 680px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-xl);
    width: 100%;
    font-family: var(--font-serif);
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.content-page-content p,
.content-page-content ul,
.content-page-content ol {
    margin-bottom: var(--space-lg);
}

.content-page-content li {
    margin-bottom: var(--space-xs);
}

.content-page-content pre {
    font-size: 0.875rem;
    line-height: 1.5;
    background: var(--bg-secondary);
    padding: var(--space-lg);
    overflow-x: auto;
    border: 1px solid var(--border-subtle);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.content-page-content code {
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 0.875em;
}

.content-page-footer {
    display: flex;
    justify-content: center;
    padding: var(--space-xl) var(--space-xl) calc(var(--space-xl) * 2);
    border-top: 1px solid var(--border-subtle);
}

.start-reading-btn {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    background: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    padding: var(--space-md) var(--space-xl);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.start-reading-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    background: var(--text-secondary);
}

/* Appendix specific layout */
.content-page-view.is-appendix .content-page-content {
    max-width: 1200px;
    padding: var(--space-xl);
    font-family: 'SF Mono', 'Consolas', monospace;
}

.appendix-code {
    background: transparent;
    padding: 0;
    border-radius: 0;
    border: none;
    overflow-x: auto;
    font-family: inherit;
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-break: break-all;
    margin: 0;
}

.appendix-code code {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: transparent;
    padding: 0;
}

/* -----------------------------------------------------------------------------
   Responsive
   ----------------------------------------------------------------------------- */

/* -----------------------------------------------------------------------------
   Skeletons & Loading
   ----------------------------------------------------------------------------- */

.skeleton {
    background: var(--bg-secondary);
    background: linear-gradient(90deg,
            var(--bg-secondary) 25%,
            var(--border-subtle) 50%,
            var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 4px;
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

.skeleton-text {
    height: 1.25rem;
    margin-bottom: var(--space-md);
    width: 100%;
}

.skeleton-title {
    height: 2.8rem;
    width: 60%;
    margin-bottom: var(--space-xl);
}

@media (max-width: 768px) {
    .library {
        padding: var(--space-lg);
    }

    .library-title {
        font-size: 2.5rem;
    }

    .library-shelf {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }

    .entry-header {
        padding: 0 var(--space-md);
        height: 64px;
    }

    .nav-btn,
    .nav-btn-contents {
        padding: 0 var(--space-md);
    }

    .entry-position {
        display: none;
    }

    .entry-content {
        padding: var(--space-lg);
    }

    .entry-content h1 {
        font-size: 1.75rem;
    }

    .cover-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .nav-btn {
        padding: 0 var(--space-sm);
        font-size: 0.7rem;
        min-width: 0 !important;
        flex: 1;
    }

    .entry-footer {
        padding: var(--space-xl) var(--space-md);
        gap: var(--space-xs);
    }

    .entry-footer .nav-btn {
        height: 36px;
    }

    .nav-btn-contents {
        padding: 0 var(--space-sm);
        font-size: 0.75rem;
    }
}