/* ============================================
   Symbolic Math Showcase - Premium Styling
   Gold + Glow + Dark Theme
   Fonts: Source Code Pro, Playfair Display
   ============================================ */

:root {
    --gold-primary: #D4AF37;
    --gold-light: #F4D03F;
    --gold-dark: #B8941E;
    --dark-bg: #0A0A0A;
    --dark-surface: #151515;
    --dark-elevated: #1E1E1E;
    --text-primary: #E8E8E8;
    --text-secondary: #B0B0B0;
    --text-muted: #808080;
    --ruby-red: #CC342D;
    --ruby-pink: #E8506E;
    --code-bg: #1a1a1a;
    --glow-gold: rgba(212, 175, 55, 0.4);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Source Code Pro', monospace;
    background: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', serif;
    font-weight: 600;
}

/* ============================================
   Background Effects
   ============================================ */

.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at top, rgba(212, 175, 55, 0.08), transparent 50%),
                radial-gradient(ellipse at bottom, rgba(212, 175, 55, 0.05), transparent 50%);
    z-index: -2;
    pointer-events: none;
}

.orbs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--gold-primary), transparent 70%);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--ruby-red), transparent 70%);
    bottom: -150px;
    left: -150px;
    animation-delay: 7s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--gold-light), transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(50px, 50px) scale(1.1); }
    50% { transform: translate(0, 100px) scale(0.9); }
    75% { transform: translate(-50px, 50px) scale(1.05); }
}

/* ============================================
   Navigation
   ============================================ */

.nav-bar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(212, 175, 55, 0.2);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: 'Playfair Display', serif;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--gold-primary);
    text-shadow: 0 0 20px var(--glow-gold);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--gold-primary);
    background: rgba(212, 175, 55, 0.1);
    box-shadow: 0 0 20px rgba(212, 175, 55, 0.2);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gold-primary);
    transition: width 0.3s ease;
}

.nav-link.active::after {
    width: 60%;
}

/* ============================================
   Hero Section
   ============================================ */

.hero-section {
    padding: 8rem 2rem 6rem;
    text-align: center;
    position: relative;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--ruby-red), var(--ruby-pink));
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 25px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 20px rgba(204, 52, 45, 0.3);
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 700;
    color: var(--gold-primary);
    margin-bottom: 1.5rem;
    text-shadow: 0 0 40px var(--glow-gold);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.4rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-family: 'Source Code Pro', monospace;
    font-weight: 400;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.feature-pill {
    background: rgba(212, 175, 55, 0.15);
    border: 1px solid rgba(212, 175, 55, 0.3);
    color: var(--gold-light);
    padding: 0.7rem 1.5rem;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.feature-pill:hover {
    background: rgba(212, 175, 55, 0.25);
    box-shadow: 0 0 25px rgba(212, 175, 55, 0.3);
    transform: translateY(-2px);
}

/* ============================================
   Container & Sections
   ============================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.content-section {
    margin-bottom: 8rem;
    padding-top: 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 3rem;
    color: var(--gold-primary);
    margin-bottom: 1rem;
    text-shadow: 0 0 30px var(--glow-gold);
}

.section-divider {
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--gold-primary), transparent);
    margin: 0 auto;
    box-shadow: 0 0 20px var(--glow-gold);
}

.subsection-title {
    font-size: 1.8rem;
    color: var(--gold-light);
    margin: 3rem 0 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid rgba(212, 175, 55, 0.2);
}

.text-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.styled-list {
    list-style: none;
    margin: 1.5rem 0;
    padding-left: 0;
}

.styled-list li {
    padding: 0.7rem 0 0.7rem 2.5rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.styled-list li::before {
    content: '▸';
    position: absolute;
    left: 0.5rem;
    color: var(--gold-primary);
    font-weight: bold;
}

.styled-list li strong {
    color: var(--gold-light);
}

/* ============================================
   Info Cards Grid
   ============================================ */

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.info-card {
    background: var(--dark-surface);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.info-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(212, 175, 55, 0.08), transparent 60%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.info-card:hover {
    transform: translateY(-8px);
    border-color: var(--gold-primary);
    box-shadow: 0 15px 40px rgba(212, 175, 55, 0.25);
}

.info-card:hover::before {
    opacity: 1;
}

.info-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.info-card h3 {
    color: var(--gold-primary);
    font-size: 1.4rem;
    margin-bottom: 1rem;
}

.info-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ============================================
   Note Boxes
   ============================================ */

.tech-note,
.github-note {
    background: rgba(212, 175, 55, 0.08);
    border-left: 4px solid var(--gold-primary);
    border-radius: 12px;
    padding: 1.5rem 2rem;
    margin: 2rem 0;
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
}

.github-note {
    background: rgba(204, 52, 45, 0.08);
    border-left-color: var(--ruby-red);
}

.note-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.note-content {
    flex: 1;
}

.note-content strong {
    color: var(--gold-light);
    font-size: 1.1rem;
}

.note-content p {
    margin-top: 0.5rem;
}

/* ============================================
   Code Blocks
   ============================================ */

.code-block-wrapper {
    background: var(--code-bg);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 12px;
    overflow: hidden;
    margin: 2rem 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.code-header {
    background: rgba(212, 175, 55, 0.1);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}

.code-lang {
    background: var(--ruby-red);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.code-file {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.code-block-wrapper pre {
    margin: 0;
    padding: 1.5rem;
    overflow-x: auto;
    background: transparent;
}

.code-block-wrapper code {
    font-family: 'Source Code Pro', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-primary);
}

/* Ruby syntax highlighting colors */
.hljs-keyword,
.hljs-selector-tag,
.hljs-literal,
.hljs-section,
.hljs-link {
    color: var(--ruby-pink);
}

.hljs-function .hljs-keyword {
    color: var(--gold-primary);
}

.hljs-string,
.hljs-title,
.hljs-name,
.hljs-type,
.hljs-attribute,
.hljs-symbol,
.hljs-bullet,
.hljs-addition,
.hljs-variable,
.hljs-template-tag,
.hljs-template-variable {
    color: #98C379;
}

.hljs-comment,
.hljs-quote,
.hljs-deletion,
.hljs-meta {
    color: #5C6370;
    font-style: italic;
}

.hljs-number {
    color: #D19A66;
}

/* ============================================
   Example Output
   ============================================ */

.example-output {
    background: var(--dark-surface);
    border: 1px solid rgba(212, 175, 55, 0.3);
    border-radius: 12px;
    overflow: hidden;
    margin: 2rem 0;
}

.output-header {
    background: rgba(212, 175, 55, 0.15);
    padding: 1rem 1.5rem;
    color: var(--gold-light);
    font-weight: 600;
    border-bottom: 1px solid rgba(212, 175, 55, 0.3);
}

.output-content {
    padding: 1.5rem;
    font-family: 'Source Code Pro', monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
    overflow-x: auto;
    background: rgba(0, 0, 0, 0.3);
}

.output-caption {
    padding: 1rem 1.5rem;
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
    border-top: 1px solid rgba(212, 175, 55, 0.2);
}

/* ============================================
   Math Rules
   ============================================ */

.math-rules {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.math-rule {
    background: rgba(212, 175, 55, 0.05);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.math-rule:hover {
    border-color: var(--gold-primary);
    box-shadow: 0 8px 25px rgba(212, 175, 55, 0.2);
    transform: translateY(-4px);
}

.rule-name {
    color: var(--gold-light);
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-family: 'Playfair Display', serif;
}

.rule-formula {
    color: var(--text-primary);
    font-size: 1.1rem;
}

/* ============================================
   Math Explanation
   ============================================ */

.math-explanation {
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.08), rgba(204, 52, 45, 0.05));
    border-left: 4px solid var(--gold-primary);
    border-radius: 12px;
    padding: 1.5rem 2rem;
    margin: 2rem 0;
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.math-explanation strong {
    color: var(--gold-light);
    font-size: 1.1rem;
}

/* ============================================
   Tier Grid
   ============================================ */

.tier-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.tier-card {
    background: var(--dark-surface);
    border: 2px solid rgba(212, 175, 55, 0.3);
    border-radius: 16px;
    padding: 2rem;
    position: relative;
}

.tier-badge {
    position: absolute;
    top: -12px;
    right: 20px;
    background: var(--gold-primary);
    color: var(--dark-bg);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.5);
}

.tier-badge.experimental {
    background: linear-gradient(135deg, var(--ruby-red), var(--ruby-pink));
    color: white;
}

.tier-card h4 {
    color: var(--gold-light);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    margin-top: 0.5rem;
}

.tier-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.tier-card ul {
    list-style: none;
    padding-left: 0;
}

.tier-card ul li {
    padding: 0.5rem 0 0.5rem 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.tier-card ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--gold-primary);
    font-weight: bold;
}

/* ============================================
   Technique Showcase
   ============================================ */

.technique-showcase {
    margin: 2rem 0;
}

.technique-item {
    background: var(--dark-surface);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
}

.technique-item:hover {
    border-color: var(--gold-primary);
    box-shadow: 0 8px 25px rgba(212, 175, 55, 0.2);
}

.technique-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.technique-name {
    color: var(--gold-light);
    font-size: 1.3rem;
    font-weight: 600;
    font-family: 'Playfair Display', serif;
}

.technique-tag {
    background: rgba(212, 175, 55, 0.2);
    color: var(--gold-primary);
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
}

.technique-example {
    margin: 1.5rem 0;
    text-align: center;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
}

.technique-item p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   Complexity Demo
   ============================================ */

.complexity-demo {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin: 2rem 0;
    padding: 2rem;
    background: rgba(204, 52, 45, 0.08);
    border-radius: 16px;
    border: 2px solid rgba(204, 52, 45, 0.3);
}

.complexity-item {
    flex: 1;
    text-align: center;
}

.complexity-label {
    color: var(--ruby-pink);
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-family: 'Playfair Display', serif;
}

.complexity-expr {
    background: rgba(0, 0, 0, 0.4);
    padding: 1.5rem;
    border-radius: 8px;
}

.complexity-arrow {
    color: var(--gold-primary);
    font-size: 1.5rem;
    font-weight: bold;
    flex-shrink: 0;
}

/* ============================================
   Rules Grid
   ============================================ */

.rules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.rule-card {
    background: var(--dark-surface);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 12px;
    padding: 1.5rem;
}

.rule-title {
    color: var(--gold-light);
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-family: 'Playfair Display', serif;
    text-align: center;
}

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

.rule-list li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    text-align: center;
    font-family: 'Source Code Pro', monospace;
}

/* ============================================
   Expansion Showcase
   ============================================ */

.expansion-showcase {
    background: rgba(212, 175, 55, 0.05);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
}

.expansion-showcase h4 {
    color: var(--gold-primary);
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.expansion-list {
    display: grid;
    gap: 1rem;
}

.expansion-item {
    background: rgba(0, 0, 0, 0.3);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
}

.expansion-formula {
    color: var(--text-primary);
}

/* ============================================
   Vector Operations
   ============================================ */

.vector-ops {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.vector-op {
    background: var(--dark-surface);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
}

.vector-name {
    color: var(--gold-light);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    font-family: 'Playfair Display', serif;
}

.vector-formula {
    color: var(--text-primary);
}

/* ============================================
   LaTeX Examples
   ============================================ */

.latex-examples {
    margin: 2rem 0;
}

.latex-examples h4 {
    color: var(--gold-primary);
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.latex-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.latex-example {
    background: var(--dark-surface);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 12px;
    overflow: hidden;
}

.latex-input {
    background: rgba(0, 0, 0, 0.3);
    padding: 1rem;
    color: var(--text-muted);
    font-family: 'Source Code Pro', monospace;
    font-size: 0.85rem;
    border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}

.latex-output {
    padding: 1.5rem;
    text-align: center;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ============================================
   Test Statistics
   ============================================ */

.test-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.test-category {
    background: rgba(212, 175, 55, 0.08);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.test-category:hover {
    background: rgba(212, 175, 55, 0.12);
    box-shadow: 0 8px 20px rgba(212, 175, 55, 0.2);
    transform: translateY(-4px);
}

.test-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.test-name {
    color: var(--gold-light);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.test-count {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============================================
   UI Guide
   ============================================ */

.ui-guide {
    margin: 3rem 0;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.ui-step {
    background: var(--dark-surface);
    border: 1px solid rgba(212, 175, 55, 0.15);
    border-radius: 16px;
    padding: 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
    transition: all 0.3s ease;
}

.ui-step:hover {
    border-color: rgba(212, 175, 55, 0.4);
    box-shadow: 0 8px 25px rgba(212, 175, 55, 0.15);
}

.ui-image {
    width: 100%;
    max-width: 800px;
    border-radius: 12px;
    border: 1px solid rgba(212, 175, 55, 0.2);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.ui-description h4 {
    color: var(--gold-light);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-family: 'Playfair Display', serif;
}

.ui-description p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1rem;
}

@media (max-width: 900px) {
    .ui-step {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Video Showcases
   ============================================ */

.demo-video-section {
    margin: 3rem 0;
}

.demo-video-section h4 {
    color: var(--gold-light);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-family: 'Playfair Display', serif;
}

.video-showcase {
    background: linear-gradient(135deg, 
        rgba(15, 15, 32, 0.7) 0%, 
        rgba(10, 10, 24, 0.5) 100%);
    border: 1px solid rgba(212, 175, 55, 0.25);
    border-radius: 16px;
    padding: 2rem;
    margin-top: 1.5rem;
    max-width: 1200px;
    box-shadow: 
        0 8px 32px rgba(212, 175, 55, 0.1), 
        0 0 40px rgba(212, 175, 55, 0.15);
    transition: all 0.4s ease;
}

.video-showcase:hover {
    transform: translateY(-4px);
    box-shadow: 
        0 12px 40px rgba(212, 175, 55, 0.2), 
        0 0 50px rgba(212, 175, 55, 0.25);
    border-color: rgba(212, 175, 55, 0.4);
}

.video-showcase video {
    width: 100%;
    max-width: 1200px;
    border-radius: 12px;
    border: 1px solid rgba(212, 175, 55, 0.3);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

/* ============================================
   Back Button
   ============================================ */

.back-button {
    position: fixed;
    top: 6rem;
    left: 2rem;
    z-index: 1000;
    background: linear-gradient(135deg, 
        rgba(15, 15, 32, 0.9) 0%, 
        rgba(10, 10, 24, 0.85) 100%);
    border: 1px solid rgba(212, 175, 55, 0.3);
    border-radius: 12px;
    padding: 0.8rem 1.5rem;
    color: var(--gold-light);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.back-button:hover {
    border-color: rgba(212, 175, 55, 0.6);
    box-shadow: 0 6px 25px rgba(212, 175, 55, 0.25);
    transform: translateX(-4px);
    color: var(--gold-primary);
}

.back-button::before {
    content: '←';
    font-size: 1.2rem;
}

/* ============================================
   Feature Highlight
   ============================================ */

.feature-highlight {
    background: linear-gradient(135deg, 
        rgba(212, 175, 55, 0.15) 0%, 
        rgba(212, 175, 55, 0.05) 100%);
    border: 2px solid rgba(212, 175, 55, 0.3);
    border-radius: 12px;
    padding: 2rem;
    margin: 3rem 0;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.highlight-icon {
    font-size: 2.5rem;
    color: var(--gold-primary);
    font-weight: bold;
    background: rgba(212, 175, 55, 0.2);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    flex-shrink: 0;
}

.highlight-text {
    color: var(--text-primary);
    font-size: 1.1rem;
    line-height: 1.7;
}

.highlight-text strong {
    color: var(--gold-light);
}

/* ============================================
   RISCH Note
   ============================================ */

.risch-note {
    background: linear-gradient(135deg, 
        rgba(204, 52, 45, 0.1) 0%, 
        rgba(212, 175, 55, 0.05) 100%);
    border: 1px solid rgba(212, 175, 55, 0.25);
    border-radius: 16px;
    padding: 2.5rem;
    margin: 3rem 0;
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.risch-note .note-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.risch-note .note-content {
    flex: 1;
}

.risch-note h4 {
    color: var(--gold-light);
    font-size: 1.4rem;
    margin-bottom: 1rem;
    font-family: 'Playfair Display', serif;
}

.risch-note p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

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

.risch-note strong {
    color: var(--gold-primary);
}

/* ============================================
   View Comparison
   ============================================ */

.view-comparison {
    margin: 2rem 0;
}

.view-benefits {
    background: var(--dark-surface);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 16px;
    padding: 2.5rem;
}

.view-benefits h4 {
    color: var(--gold-light);
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    font-family: 'Playfair Display', serif;
}

.view-benefits ul {
    list-style: none;
    padding: 0;
}

.view-benefits ul li {
    color: var(--text-secondary);
    padding: 1rem 0;
    padding-left: 2rem;
    position: relative;
    line-height: 1.7;
    border-bottom: 1px solid rgba(212, 175, 55, 0.1);
}

.view-benefits ul li:last-child {
    border-bottom: none;
}

.view-benefits ul li:before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--gold-primary);
    font-size: 1.2rem;
}

.view-benefits ul li strong {
    color: var(--gold-light);
}

/* ============================================
   Language Badge
   ============================================ */

.language-badge {
    display: inline-block;
    background: linear-gradient(135deg, 
        rgba(212, 175, 55, 0.2) 0%, 
        rgba(212, 175, 55, 0.1) 100%);
    border: 1px solid rgba(212, 175, 55, 0.4);
    border-radius: 8px;
    padding: 0.4rem 1rem;
    color: var(--gold-light);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-left: 1rem;
    box-shadow: 0 2px 8px rgba(212, 175, 55, 0.15);
}

/* ============================================
   Achievements
   ============================================ */

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.achievement-card {
    background: var(--dark-surface);
    border: 1px solid rgba(212, 175, 55, 0.2);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all 0.4s ease;
}

.achievement-card:hover {
    border-color: var(--gold-primary);
    box-shadow: 0 12px 35px rgba(212, 175, 55, 0.25);
    transform: translateY(-8px);
}

.achievement-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.achievement-card h4 {
    color: var(--gold-light);
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.achievement-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ============================================
   Final Note
   ============================================ */

.final-note {
    background: rgba(212, 175, 55, 0.05);
    border: 2px solid rgba(212, 175, 55, 0.3);
    border-radius: 16px;
    padding: 3rem;
    margin: 3rem 0;
}

.final-note h3 {
    color: var(--gold-primary);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.final-note p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.final-note strong {
    color: var(--gold-light);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: rgba(10, 10, 10, 0.95);
    border-top: 1px solid rgba(212, 175, 55, 0.2);
    padding: 2rem;
    margin-top: 6rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-note {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .complexity-demo {
        flex-direction: column;
    }
    
    .complexity-arrow {
        transform: rotate(90deg);
    }
    
    .code-block-wrapper pre {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .hero-section {
        padding: 4rem 1rem 3rem;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .info-grid,
    .tier-grid,
    .achievements-grid {
        grid-template-columns: 1fr;
    }
}

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

::-webkit-scrollbar {
    width: 12px;
}

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

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--gold-primary), var(--gold-dark));
    border-radius: 6px;
}

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

/* ============================================
   MathJax Overrides
   ============================================ */

.MathJax {
    color: var(--text-primary) !important;
}

mjx-container[jax="CHTML"] {
    color: var(--text-primary) !important;
}