/* ==========================================================================
   Cowism Noble Cow Book Reader Stylings
   ========================================================================== */

/* CSS Variables */
:root {
    /* Color Tokens (OKLCH Space) */
    --color-paper: oklch(12% 0.012 145);
    --color-paper-2: oklch(15% 0.018 145);
    --color-paper-3: oklch(19% 0.022 145);
    --color-paper-deep: oklch(9% 0.008 145);
    --color-ink: oklch(95% 0.005 145);
    --color-ink-2: oklch(80% 0.008 145);
    --color-rule: oklch(26% 0.015 145);
    --color-accent: oklch(82% 0.14 85);
    --color-accent-hover: oklch(88% 0.10 85);
    --color-accent-ink: oklch(12% 0.012 145);
    --color-focus: oklch(85% 0.18 85);
    
    /* Alpha Composites */
    --color-glass-bg: oklch(12% 0.012 145 / 75%);
    --color-glass-border: oklch(82% 0.14 85 / 15%);
    --color-glass-border-hover: oklch(82% 0.14 85 / 35%);
    --color-card-bg: oklch(15% 0.018 145 / 40%);
    --color-accent-glow: oklch(82% 0.14 85 / 8%);
    --color-accent-glow-strong: oklch(82% 0.14 85 / 20%);
    --color-accent-translucent: oklch(82% 0.14 85 / 10%);
    --color-accent-translucent-hover: oklch(82% 0.14 85 / 20%);

    /* Typography */
    --font-display: 'Cinzel', Georgia, serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing Scale */
    --space-3xs: 0.25rem;
    --space-2xs: 0.5rem;
    --space-xs:  0.75rem;
    --space-sm:  1rem;
    --space-md:  1.5rem;
    --space-lg:  2rem;
    --space-xl:  3rem;
    --space-2xl: 4.5rem;

    /* Typography Scale */
    --text-xs:   0.64rem;
    --text-sm:   0.8rem;
    --text-base: 1rem;
    --text-md:   1.25rem;
    --text-lg:   1.5625rem;
    --text-xl:   1.9531rem;
    --text-2xl:  2.4414rem;
    
    /* Radius */
    --radius-pill: 9999px;
    --radius-card: 16px;
    
    /* Transitions & Motion */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-smooth: all 0.6s var(--ease-out);
    --transition-fast: all 0.22s var(--ease-out);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--color-paper-deep);
    color: var(--color-ink);
    font-family: var(--font-body);
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--color-paper-deep);
}

::-webkit-scrollbar-thumb {
    background: var(--color-glass-border-hover);
    border-radius: 3px;
}

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

/* Table of Contents scrollbar custom styling */
.chapter-list-scroll::-webkit-scrollbar {
    width: 4px;
}

.chapter-list-scroll::-webkit-scrollbar-track {
    background: var(--color-paper);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2xs);
    padding: 12px 24px;
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--radius-pill);
    border: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.05rem;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-accent-ink);
    box-shadow: 0 10px 25px var(--color-accent-translucent);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 15px 30px var(--color-accent-translucent-hover);
}

.btn-secondary {
    background-color: var(--color-accent-translucent);
    color: var(--color-accent-hover);
    border: 1px solid var(--color-glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background-color: var(--color-accent-translucent-hover);
    border-color: var(--color-accent);
    color: var(--color-ink);
    transform: translateY(-2px);
}

.btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* Fullscreen Book Reader Layout */
.book-reader-container {
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.reader-header-bar {
    height: 70px;
    min-height: 70px;
    padding: 0 var(--space-xl);
    background: var(--color-glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 10;
}

.reader-title-info {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: var(--text-sm);
    letter-spacing: 0.1rem;
}

.reader-brand {
    color: var(--color-accent);
}

.reader-separator {
    opacity: 0.3;
}

.reader-current-book {
    color: var(--color-ink);
}

.btn-close-reader {
    padding: 10px 20px;
    font-size: var(--text-xs);
}

.btn-close-reader i {
    width: 14px;
    height: 14px;
    margin-right: 6px;
    transition: var(--transition-fast);
}

.btn-close-reader:hover i {
    transform: translateX(-4px);
}

.reader-workspace {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

/* Left Pane Sidebar */
.reader-sidebar {
    width: 380px;
    min-width: 380px;
    border-right: 1px solid var(--color-glass-border);
    background: var(--color-paper);
    display: flex;
    flex-direction: column;
    height: 100%;
    z-index: 5;
    transition: var(--transition-smooth);
}

.sidebar-header {
    padding: 24px var(--space-lg);
    border-bottom: 1px solid var(--color-rule);
}

.sidebar-header h3 {
    font-family: var(--font-display);
    font-size: var(--text-md);
    color: var(--color-ink);
    margin-bottom: 4px;
}

.sidebar-header p {
    font-size: var(--text-xs);
    color: var(--color-accent);
    font-weight: 600;
    letter-spacing: 0.05rem;
}

.chapter-list-scroll {
    flex: 1;
    overflow-y: auto;
}

.chapter-list-container {
    display: flex;
    flex-direction: column;
}

.sidebar-loading {
    padding: 30px;
    text-align: center;
    color: var(--color-ink-2);
}

/* Chapter Table of Contents Item */
.chapter-item {
    display: flex;
    align-items: center;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-rule);
    cursor: pointer;
    transition: var(--transition-smooth);
    text-align: left;
    background: transparent;
    border-left: 3px solid transparent;
}

.chapter-item:hover {
    background: var(--color-accent-glow);
    padding-left: 28px;
}

.chapter-item.active {
    background: var(--color-accent-translucent-hover);
    border-left-color: var(--color-accent);
}

.chapter-serial {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-accent);
    opacity: 0.6;
    flex: 0 0 45px;
    text-align: right;
    margin-right: 18px;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.chapter-item.active .chapter-serial, .chapter-item:hover .chapter-serial {
    opacity: 1;
    text-shadow: 0 0 10px var(--color-accent-glow-strong);
}

.chapter-title-wrapper {
    flex: 1;
    line-height: 1.35;
}

.chapter-title-wrapper .title-initial {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--color-accent);
    margin-right: 1px;
    display: inline-block;
    vertical-align: middle;
}

.chapter-title-text {
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-ink-2);
    vertical-align: middle;
    transition: var(--transition-fast);
}

.chapter-item.active .chapter-title-text, .chapter-item:hover .chapter-title-text {
    color: var(--color-ink);
}

/* Right Pane Content Panel */
.reader-content-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--color-paper-deep);
    position: relative;
}

.reader-scroll-area {
    flex: 1;
    overflow-y: auto;
    padding: 60px var(--space-xl) 80px;
    scroll-behavior: smooth;
}

.reader-article {
    max-width: 68ch;
    margin: 0 auto;
}

.reader-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 300px;
    color: var(--color-ink-2);
}

.preloader-sun {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-glass-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: rotatePreloader 1s infinite linear;
}

@keyframes rotatePreloader {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Chapter Detail Rendering Styles */
.chapter-detail-header {
    margin-bottom: 40px;
    text-align: center;
}

.chapter-detail-category {
    font-family: var(--font-body);
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.15rem;
    display: block;
    margin-bottom: 12px;
}

.chapter-detail-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
}

.chapter-detail-serial {
    font-family: var(--font-display);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--color-accent);
    opacity: 0.8;
}

.chapter-detail-title {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 800;
    line-height: 1.25;
    color: var(--color-ink);
}

.chapter-detail-meta {
    font-size: var(--text-xs);
    color: var(--color-ink-2);
    margin-top: 15px;
    font-weight: 500;
    letter-spacing: 0.02rem;
}

.chapter-detail-image-box {
    width: 100%;
    max-width: 720px;
    margin: 0 auto 40px;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--color-glass-border);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--color-paper);
}

.chapter-detail-image-box img {
    max-width: 100%;
    max-height: 480px;
    width: auto;
    height: auto;
    object-fit: contain;
    display: block;
}

.chapter-detail-body {
    font-family: Georgia, serif;
    font-size: 1.15rem;
    line-height: 1.95;
    color: var(--color-ink-2);
}

.chapter-detail-body p {
    margin-bottom: 24px;
}

.chapter-detail-body p:first-of-type {
    color: var(--color-ink);
}

.chapter-detail-dropcap {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 900;
    float: left;
    line-height: 0.8;
    margin-right: 12px;
    margin-top: 6px;
    color: var(--color-accent);
    text-shadow: 0 0 10px var(--color-accent-glow);
}

.chapter-detail-body blockquote {
    border-left: 2px solid var(--color-accent);
    padding: 12px var(--space-md);
    margin: 35px 0;
    font-style: italic;
    background: var(--color-accent-glow);
    color: var(--color-ink);
    font-size: 1.2rem;
    line-height: 1.6;
}

.chapter-detail-body blockquote p {
    margin-bottom: 0;
}

.chapter-detail-body br {
    content: "";
    display: block;
    margin-top: 10px;
}

/* Chapter Navigation Row inside reader view */
.reader-navigation-row {
    max-width: 68ch;
    margin: 60px auto 0;
    padding-top: 30px;
    border-top: 1px solid var(--color-rule);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.reader-nav-btn {
    font-size: var(--text-xs);
    padding: 12px 20px;
}

.reader-nav-btn i {
    width: 14px;
    height: 14px;
}

.reader-chapter-progress {
    font-family: var(--font-display);
    font-size: var(--text-xs);
    color: var(--color-accent);
    font-weight: 600;
    letter-spacing: 0.05rem;
}

/* Mobile Sidebar Toggle Button */
.mobile-sidebar-toggle {
    display: none;
    position: absolute;
    bottom: 24px;
    left: 24px;
    background: var(--color-accent);
    color: var(--color-accent-ink);
    border: none;
    border-radius: var(--radius-pill);
    padding: 12px 24px;
    font-family: var(--font-body);
    font-size: var(--text-xs);
    font-weight: 700;
    align-items: center;
    gap: 8px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    z-index: 20;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.mobile-sidebar-toggle:hover {
    transform: translateY(-2px);
    background-color: var(--color-accent-hover);
    box-shadow: 0 15px 30px var(--color-accent-translucent-hover);
}

.mobile-sidebar-toggle i {
    width: 16px;
    height: 16px;
}

/* Mobile Drawer Backdrop overlay */
.reader-sidebar-backdrop {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 4;
}

/* Responsive Overrides */
@media (max-width: 1024px) {
    .reader-sidebar {
        width: 320px;
        min-width: 320px;
    }
}

@media (max-width: 850px) {
    /* reader split-screen collapses to drawer */
    .reader-sidebar {
        position: absolute;
        top: 0;
        left: 0;
        height: 100%;
        width: 320px;
        min-width: 320px;
        transform: translateX(-100%);
        box-shadow: 15px 0 45px rgba(0, 0, 0, 0.6);
    }
    
    .reader-sidebar.open {
        transform: translateX(0);
    }
    
    .reader-sidebar-backdrop.active {
        display: block;
    }
    
    .mobile-sidebar-toggle {
        display: flex;
    }
    
    .reader-header-bar {
        padding: 0 var(--space-md);
    }
    
    .reader-scroll-area {
        padding: 40px var(--space-md) 100px;
    }
}

@media (max-width: 480px) {
    .chapter-detail-title {
        font-size: 1.5rem;
    }
    
    .chapter-detail-image-box img {
        max-height: 300px;
    }
    
    .reader-navigation-row {
        flex-direction: column;
        gap: 15px;
        align-items: stretch;
    }
    
    .reader-nav-btn {
        width: 100%;
        text-align: center;
    }
    
    .reader-chapter-progress {
        text-align: center;
        order: -1;
        margin-bottom: 5px;
    }
    
    .reader-workspace {
        position: relative;
    }
}