/* SSEv2 Chapter Page Styles - Inherits design system from main site */

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

:root {
    --cosmic-navy: #0a1628;
    --space-blue: #1e3a5f;
    --earth-teal: #2d7a8f;
    --horizon-cyan: #45b7d1;
    --aurora-green: #5dd39e;
    --stellar-gold: #f4a261;
    --crew-orange: #e76f51;
    --void-black: #000814;
    --cloud-white: #f8f9fa;
    --nebula-purple: #7b68ee;

    --cosmic-gradient: linear-gradient(135deg, var(--cosmic-navy) 0%, var(--space-blue) 50%, var(--earth-teal) 100%);
    --earth-gradient: linear-gradient(135deg, var(--earth-teal) 0%, var(--horizon-cyan) 50%, var(--aurora-green) 100%);
    --horizon-gradient: linear-gradient(to right, var(--horizon-cyan), var(--aurora-green), var(--stellar-gold));

    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--void-black);
    background-color: var(--cloud-white);
    overflow-x: hidden;
}

/* Header - matches main site */
header {
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(10px);
    color: var(--cloud-white);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 2px solid var(--horizon-cyan);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

nav {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 2px;
    background: var(--horizon-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--cloud-white);
    text-decoration: none;
    font-weight: 500;
    font-family: var(--font-display);
    transition: all 0.3s;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--horizon-cyan);
    transition: width 0.3s;
}

.nav-links a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 6px;
    z-index: 1001;
}

.hamburger span {
    width: 28px;
    height: 3px;
    background: var(--cloud-white);
    transition: all 0.3s ease;
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

/* Chapter Hero Banner */
.chapter-hero {
    background: var(--cosmic-gradient);
    color: var(--cloud-white);
    padding: 120px 2rem 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.chapter-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><circle cx="600" cy="300" r="200" fill="rgba(69,183,209,0.1)"/><circle cx="600" cy="300" r="150" fill="rgba(69,183,209,0.1)"/><circle cx="600" cy="300" r="100" fill="rgba(69,183,209,0.15)"/></svg>') center/contain no-repeat;
    opacity: 0.2;
}

.chapter-hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
}

.chapter-hero .part-label {
    display: inline-block;
    background: rgba(93, 211, 158, 0.2);
    border: 2px solid var(--aurora-green);
    color: var(--aurora-green);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

.chapter-hero h1 {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 1rem;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.chapter-meta {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1.5rem;
    font-size: 0.95rem;
    opacity: 0.85;
}

.chapter-meta span {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

/* Chapter Content Area */
.chapter-content {
    max-width: 860px;
    margin: 0 auto;
    padding: 60px 2rem 80px;
}

/* Typography for chapter body */
.chapter-content h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--space-blue);
    margin-top: 3rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--horizon-cyan);
}

.chapter-content h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--earth-teal);
    margin-top: 2.5rem;
    margin-bottom: 0.75rem;
}

.chapter-content h4 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--space-blue);
    margin-top: 2rem;
    margin-bottom: 0.5rem;
}

.chapter-content h5 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--earth-teal);
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.chapter-content p {
    font-size: 1.1rem;
    line-height: 1.85;
    margin-bottom: 1.25rem;
    color: var(--void-black);
}

.chapter-content a {
    color: var(--horizon-cyan);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.3s;
}

.chapter-content a:hover {
    color: var(--earth-teal);
    border-bottom-color: var(--earth-teal);
}

/* Blockquotes - for RBF quotes */
.chapter-content blockquote {
    background: linear-gradient(135deg, rgba(30, 58, 95, 0.06) 0%, rgba(45, 122, 143, 0.06) 100%);
    border-left: 4px solid var(--horizon-cyan);
    padding: 1.5rem 2rem;
    margin: 2rem 0;
    border-radius: 0 12px 12px 0;
    font-style: italic;
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--space-blue);
}

.chapter-content blockquote p {
    color: var(--space-blue);
    margin-bottom: 0.5rem;
}

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

/* Lists */
.chapter-content ul, .chapter-content ol {
    margin: 1rem 0 1.5rem 1.5rem;
    font-size: 1.1rem;
    line-height: 1.85;
}

.chapter-content li {
    margin-bottom: 0.5rem;
}

.chapter-content li ul, .chapter-content li ol {
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
}

/* Bold and emphasis */
.chapter-content strong {
    color: var(--space-blue);
    font-weight: 600;
}

.chapter-content em {
    color: var(--earth-teal);
}

/* Horizontal rules */
.chapter-content hr {
    border: none;
    height: 2px;
    background: var(--horizon-gradient);
    margin: 3rem 0;
    border-radius: 2px;
}

/* Code blocks */
.chapter-content code {
    background: rgba(10, 22, 40, 0.08);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.95rem;
    font-family: 'Fira Code', 'Consolas', monospace;
}

.chapter-content pre {
    background: var(--cosmic-navy);
    color: var(--cloud-white);
    padding: 1.5rem;
    border-radius: 12px;
    overflow-x: auto;
    margin: 1.5rem 0;
    border: 1px solid var(--earth-teal);
}

.chapter-content pre code {
    background: none;
    padding: 0;
    color: var(--cloud-white);
}

/* Tables */
.chapter-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 1rem;
    overflow-x: auto;
    display: block;
}

.chapter-content thead {
    background: var(--cosmic-navy);
    color: var(--cloud-white);
}

.chapter-content th {
    padding: 1rem;
    text-align: left;
    font-family: var(--font-display);
    font-weight: 600;
    white-space: nowrap;
}

.chapter-content td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid #e0e0e0;
    vertical-align: top;
}

.chapter-content tbody tr:hover {
    background: rgba(69, 183, 209, 0.05);
}

/* Images */
.chapter-content img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 1.5rem 0;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

/* Chapter Navigation */
.chapter-nav {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 2rem 60px;
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.chapter-nav a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 1.75rem;
    background: white;
    border: 2px solid var(--horizon-cyan);
    border-radius: 12px;
    text-decoration: none;
    color: var(--space-blue);
    font-family: var(--font-display);
    font-weight: 600;
    transition: all 0.3s;
    min-width: 200px;
}

.chapter-nav a:hover {
    background: rgba(69, 183, 209, 0.1);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(69, 183, 209, 0.2);
}

.chapter-nav .nav-prev {
    margin-right: auto;
}

.chapter-nav .nav-next {
    margin-left: auto;
    text-align: right;
    flex-direction: row-reverse;
}

.chapter-nav .nav-label {
    font-size: 0.8rem;
    color: var(--earth-teal);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: block;
}

.chapter-nav .nav-title {
    font-size: 0.95rem;
    display: block;
}

.chapter-nav .nav-arrow {
    font-size: 1.5rem;
    color: var(--horizon-cyan);
    flex-shrink: 0;
}

/* Back to top */
.back-to-top {
    text-align: center;
    padding-bottom: 40px;
}

.back-to-top a {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: var(--horizon-gradient);
    color: var(--void-black);
    border-radius: 50px;
    text-decoration: none;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.back-to-top a:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(69, 183, 209, 0.4);
}

/* Footer - matches main site */
footer {
    background: var(--cosmic-navy);
    color: rgba(255,255,255,0.7);
    text-align: center;
    padding: 3rem 2rem;
    border-top: 2px solid var(--earth-teal);
}

footer p {
    margin: 0.5rem 0;
}

footer a {
    color: var(--horizon-cyan);
    text-decoration: none;
}

footer a:hover {
    color: var(--aurora-green);
}

/* Progress bar */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--horizon-gradient);
    z-index: 1001;
    transition: width 0.1s;
}

/* MathJax Formula Rendering */mjx-container {    overflow-x: auto;    overflow-y: hidden;    max-width: 100%;    padding: 0.5rem 0;    display: block !important;}mjx-container[jax="CHTML"][display="true"] {    margin: 1.5rem 0;    padding: 1rem 0;    text-align: center;}/* Ensure formulas scale on small screens */mjx-container svg {    max-width: 100%;    height: auto;}/* Fallback: style raw LaTeX if MathJax fails to load */.chapter-content p > mjx-container,.chapter-content mjx-container {    font-size: 1rem;    line-height: 1.6;}
/* Responsive */
@media (max-width: 768px) {
    header {
        padding: 0.75rem 0;
    }

    nav {
        padding: 0 1rem;
    }

    .logo {
        font-size: 1.1rem;
        max-width: 200px;
        line-height: 1.2;
    }

    .hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 70%;
        max-width: 300px;
        background: rgba(10, 22, 40, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 80px 2rem 2rem;
        gap: 2rem;
        transition: right 0.3s ease;
        border-left: 2px solid var(--horizon-cyan);
        box-shadow: -5px 0 30px rgba(0, 0, 0, 0.5);
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        font-size: 1.2rem;
        padding: 0.5rem 0;
    }

    .chapter-hero {
        padding: 100px 1.5rem 40px;
    }

    .chapter-hero h1 {
        font-size: 2rem;
    }

    .chapter-meta {
        flex-direction: column;
        gap: 0.5rem;
        align-items: center;
    }

    .chapter-content {
        padding: 40px 1.25rem 60px;
    }

    .chapter-content h2 {
        font-size: 1.6rem;
    }

    .chapter-content h3 {
        font-size: 1.3rem;
    }

    .chapter-content p,
    .chapter-content li {
        font-size: 1rem;
    }

    .chapter-nav {
        flex-direction: column;
        padding: 0 1.25rem 40px;
    }

    .chapter-nav a {
        min-width: unset;
        width: 100%;
    }

    .chapter-nav .nav-next {
        text-align: left;
        flex-direction: row;
    }

    .chapter-content table {
        font-size: 0.85rem;    }    mjx-container {        font-size: 0.85rem;        overflow-x: auto;        -webkit-overflow-scrolling: touch;    }    mjx-container[jax="CHTML"][display="true"] {        margin: 1rem 0;        padding: 0.5rem 0;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 0.95rem;
    }

    .nav-links {
        width: 80%;
    }

    .chapter-hero h1 {
        font-size: 1.75rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}