/**
 * Indian Polity Simulation Book - Main Stylesheet
 * Dark Premium Theme with Indian Polity Branding
 */

/* ============================================
   CSS VARIABLES (Root)
   ============================================ */
:root {
    /* Colors */
    --bg-base: #0a0e1a;
    --bg-dark: #050810;
    --bg-card: rgba(20, 25, 40, 0.8);
    --bg-card-hover: rgba(30, 35, 50, 0.9);
    
    --accent-gold: #f2c94c;
    --accent-gold-light: #f5d76e;
    --accent-gold-dark: #d4a842;
    --accent-saffron: #ff9933;
    --accent-green: #138808;
    
    --text-primary: #f5f5f5;
    --text-secondary: #b8c5d6;
    --text-muted: #7a8a9f;
    
    --border-gold: rgba(242, 201, 76, 0.3);
    --border-gold-strong: rgba(242, 201, 76, 0.6);
    
    /* Typography */
    --font-tamil: 'Noto Sans Tamil', 'Inter', sans-serif;
    --font-english: 'Inter', 'Noto Sans Tamil', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Layout */
    --sidebar-width: 280px;
    --topbar-height: 70px;
    
    /* Effects */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --glow-gold: 0 0 20px rgba(242, 201, 76, 0.3);
}

/* ============================================
   RESET & BASE
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-tamil);
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-base) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    /* Tamil text rendering improvements */
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TOPBAR
   ============================================ */
.topbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--topbar-height);
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-gold);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-md);
    box-shadow: var(--shadow-md);
    min-width: 0;
}

.topbar-left {
    display: flex;
    align-items: center;
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-line1 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--accent-gold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-family: var(--font-english);
    white-space: nowrap;
}

.logo-line2 {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 2px;
    font-family: var(--font-english);
    white-space: nowrap;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.creator-badge {
    background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-gold-dark) 100%);
    color: var(--bg-dark);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font-english);
    box-shadow: var(--glow-gold);
    white-space: nowrap;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: 2px solid var(--border-gold);
    padding: 10px 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    z-index: 1001;
    position: relative;
}

.mobile-menu-toggle:hover {
    background: rgba(242, 201, 76, 0.1);
    border-color: var(--accent-gold);
}

.mobile-menu-toggle.active {
    background: rgba(242, 201, 76, 0.2);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 3px;
    background: var(--accent-gold);
    transition: all 0.3s ease;
    border-radius: 2px;
    display: block;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ============================================
   MAIN LAYOUT
   ============================================ */
.main-layout {
    display: flex;
    min-height: calc(100vh - var(--topbar-height) - 60px);
}

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    max-width: var(--sidebar-width);
    background: rgba(15, 20, 35, 0.95);
    backdrop-filter: blur(10px);
    border-right: 1px solid var(--border-gold);
    padding: var(--spacing-md);
    overflow-y: auto;
    overflow-x: hidden;
    position: fixed;
    left: 0;
    top: var(--topbar-height);
    height: calc(100vh - var(--topbar-height));
    transition: transform 0.3s ease;
    z-index: 100;
}

.sidebar-header h3 {
    font-size: 1.1rem;
    color: var(--accent-gold);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-english);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.sidebar-item {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-sm);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-secondary);
    transition: all 0.3s;
    border-left: 3px solid transparent;
    word-wrap: break-word;
    overflow-wrap: break-word;
    min-width: 0;
}

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

.sidebar-item.active {
    background: var(--bg-card);
    border-left-color: var(--accent-gold);
    color: var(--accent-gold);
    box-shadow: var(--glow-gold);
}

.page-number {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    font-family: var(--font-english);
}

.sidebar-item.active .page-number {
    color: var(--accent-gold-light);
}

.sidebar .page-title {
    font-size: 0.85rem;
    margin-top: 4px;
    line-height: 1.4;
    word-break: break-word;
    overflow-wrap: break-word;
    display: block;
}

.sidebar-footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-gold);
}

.brand-statement {
    background: var(--bg-card);
    border: 1px solid var(--border-gold);
    border-radius: 8px;
    padding: var(--spacing-sm);
    box-shadow: var(--glow-gold);
}

.brand-icon {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.brand-statement p {
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.brand-statement strong {
    color: var(--accent-gold);
}

/* ============================================
   CHAPTER GROUPS
   ============================================ */
.chapter-group {
    margin-bottom: var(--spacing-xs);
}

.chapter-header {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-sm);
    background: rgba(242, 201, 76, 0.1);
    border: 1px solid var(--border-gold);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
}

.chapter-header:hover {
    background: rgba(242, 201, 76, 0.15);
    border-color: var(--accent-gold);
}

.chapter-group.has-active .chapter-header {
    background: rgba(242, 201, 76, 0.2);
    border-color: var(--accent-gold);
    box-shadow: var(--glow-gold);
}

.chapter-code {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--accent-gold);
    font-family: var(--font-english);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.chapter-title {
    font-size: 0.85rem;
    color: var(--text-primary);
    line-height: 1.4;
    word-break: break-word;
    overflow-wrap: break-word;
    display: block;
}

.chapter-toggle {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-gold);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-english);
}

.chapter-pages {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    margin-top: var(--spacing-xs);
    padding-left: var(--spacing-sm);
    border-left: 2px solid var(--border-gold);
}

.chapter-pages.expanded {
    max-height: 2000px;
}

.chapter-pages .page-item {
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-sm);
}

.chapter-pages .page-item .page-number {
    font-size: 0.7rem;
}

.chapter-pages .page-item .page-title {
    font-size: 0.8rem;
}

/* ============================================
   CONTENT AREA
   ============================================ */
.content-area {
    flex: 1;
    margin-left: var(--sidebar-width);
    position: relative;
    min-height: calc(100vh - var(--topbar-height));
    width: calc(100% - var(--sidebar-width));
    max-width: calc(100% - var(--sidebar-width));
    overflow-x: hidden;
}

.content-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.08;
    overflow: hidden;
}

.bg-svg {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.content-wrapper {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    width: 100%;
    box-sizing: border-box;
    /* Tamil text container fixes */
    overflow-x: hidden;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero-section {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-xl);
    background: var(--bg-card);
    border: 2px solid var(--border-gold);
    border-radius: 16px;
    box-shadow: var(--glow-gold);
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-gold);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-english);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.hero-subtext {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-gold-dark) 100%);
    color: var(--bg-dark);
    padding: 1rem 2rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s;
    box-shadow: var(--shadow-md);
}

.hero-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ============================================
   PAGE META & TITLE
   ============================================ */
.page-meta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.meta-pill {
    background: var(--bg-card);
    border: 1px solid var(--border-gold);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--accent-gold);
    font-family: var(--font-english);
}

.tagline-pill {
    color: var(--text-secondary);
    border-color: var(--border-gold-strong);
}

.page-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    white-space: normal;
    hyphens: none;
}

.page-subtitle {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xl);
    font-family: var(--font-english);
    font-style: italic;
}

/* ============================================
   CONTENT SECTIONS
   ============================================ */
.content-section {
    margin-bottom: var(--spacing-xl);
}

.section-heading {
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--accent-gold);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--border-gold);
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    white-space: normal;
    line-height: 1.4;
    hyphens: none;
}

/* Text Content */
.text-content {
    font-size: 1.1rem;
    line-height: 1.9;
    color: var(--text-secondary);
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border-left: 4px solid var(--accent-gold);
    /* Tamil text rendering fixes */
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    hyphens: none;
    white-space: normal;
    text-align: justify;
    text-justify: inter-word;
    /* Ensure proper Tamil font rendering */
    font-feature-settings: "kern" 1;
    font-kerning: normal;
    /* Prevent text overflow */
    overflow-x: hidden;
    max-width: 100%;
}

.text-content strong {
    color: var(--accent-gold);
    font-weight: 600;
}

.text-content ul {
    list-style: none;
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-md);
}

.text-content ul li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    /* Tamil list item fixes */
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    white-space: normal;
    line-height: 1.8;
    text-align: left;
}

.text-content ul li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent-gold);
    font-weight: bold;
    font-size: 1.2rem;
}

.text-content p {
    margin-bottom: var(--spacing-md);
    /* Tamil paragraph fixes */
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    white-space: normal;
    text-align: justify;
    line-height: 1.9;
    /* Prevent text from breaking incorrectly */
    hyphens: none;
}

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

/* Infogrid */
.infogrid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.infogrid-card {
    background: var(--bg-card);
    border: 1px solid var(--border-gold);
    border-radius: 12px;
    padding: var(--spacing-lg);
    transition: all 0.3s;
    box-shadow: var(--shadow-sm);
}

.infogrid-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-gold);
    box-shadow: var(--glow-gold);
}

.card-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-gold);
    margin-bottom: var(--spacing-sm);
}

.card-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
    /* Tamil text fixes for cards */
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    white-space: normal;
    text-align: left;
    hyphens: none;
}

/* Steps List */
.steps-list {
    list-style: none;
    counter-reset: step-counter;
    margin-top: var(--spacing-md);
}

.step-item {
    counter-increment: step-counter;
    position: relative;
    padding-left: 3rem;
    padding-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
    /* Tamil text fixes for steps */
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    white-space: normal;
    text-align: left;
    hyphens: none;
}

.step-item::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: 2rem;
    height: 2rem;
    background: var(--accent-gold);
    color: var(--bg-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    font-family: var(--font-english);
}

/* Quiz Card */
.quiz-card {
    background: var(--bg-card);
    border: 2px solid var(--border-gold);
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin-top: var(--spacing-md);
    box-shadow: var(--glow-gold);
}

.quiz-question {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-gold);
    margin-bottom: var(--spacing-md);
    /* Tamil quiz question fixes */
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    white-space: normal;
    line-height: 1.5;
}

.quiz-options {
    list-style: none;
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.quiz-option {
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    background: rgba(242, 201, 76, 0.1);
    border-left: 3px solid var(--accent-gold);
    border-radius: 4px;
    color: var(--text-secondary);
    /* Tamil quiz option fixes */
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    white-space: normal;
    line-height: 1.6;
}

.quiz-note {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-style: italic;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-gold);
}

/* Simulation Block */
.simulation-block {
    background: var(--bg-card);
    border: 2px solid var(--border-gold);
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin-top: var(--spacing-md);
    text-align: center;
    box-shadow: var(--glow-gold);
}

.sim-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
    /* Tamil simulation description fixes */
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    white-space: normal;
    text-align: left;
}

.sim-button {
    background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-gold-dark) 100%);
    color: var(--bg-dark);
    border: none;
    padding: 1rem 2rem;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: var(--shadow-md);
    font-family: var(--font-tamil);
}

.sim-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.sim-button:active {
    transform: translateY(0);
}

.sim-output {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(242, 201, 76, 0.1);
    border: 1px solid var(--border-gold);
    border-radius: 8px;
    min-height: 60px;
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.6;
    display: none;
    /* Tamil simulation output fixes */
    word-wrap: break-word;
    overflow-wrap: break-word;
    word-break: normal;
    white-space: normal;
    text-align: left;
}

.sim-output.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   PAGE NAVIGATION
   ============================================ */
.page-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-gold);
}

.nav-button {
    background: var(--bg-card);
    border: 1px solid var(--border-gold);
    color: var(--accent-gold);
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    font-family: var(--font-english);
}

.nav-button:hover:not(.disabled) {
    background: var(--accent-gold);
    color: var(--bg-dark);
    box-shadow: var(--glow-gold);
}

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

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

.nav-center p {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: var(--font-english);
    font-style: italic;
}

/* ============================================
   FOOTER
   ============================================ */
.main-footer {
    background: rgba(5, 8, 16, 0.9);
    border-top: 1px solid var(--border-gold);
    padding: var(--spacing-md);
    text-align: center;
    margin-top: var(--spacing-xl);
}

.main-footer p {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: var(--font-english);
}

/* Intro banner */
.intro-banner {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: radial-gradient(120% 120% at 10% 10%, rgba(242, 201, 76, 0.25), transparent 45%),
                radial-gradient(120% 120% at 90% 0%, rgba(120, 219, 252, 0.18), transparent 40%),
                rgba(10, 12, 20, 0.7);
    border: 1px solid rgba(242, 201, 76, 0.35);
    border-radius: 18px;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.intro-banner::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(242, 201, 76, 0.12), rgba(255, 255, 255, 0));
    opacity: 0.6;
    pointer-events: none;
}

.intro-banner__header h2 {
    margin: 0.35rem 0;
    font-size: 1.45rem;
    color: var(--text-primary);
    letter-spacing: 0.3px;
}

.intro-banner__body p {
    color: var(--text-secondary);
    line-height: 1.75;
}

.intro-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.intro-card {
    padding: var(--spacing-md);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.04), rgba(8, 10, 18, 0.65));
    border: 1px solid rgba(242, 201, 76, 0.3);
    border-radius: 14px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.intro-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 22px 50px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(242, 201, 76, 0.25);
    border-color: rgba(242, 201, 76, 0.6);
}

.intro-card h3 {
    margin-bottom: var(--spacing-xs);
    font-size: 1rem;
    color: var(--accent-gold);
    letter-spacing: 0.2px;
}

.intro-card ul {
    margin: 0;
    padding-left: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.intro-card ul li {
    position: relative;
    list-style: none;
    margin-bottom: 0.35rem;
    padding-left: 1.2rem;
}

.intro-card ul li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent-gold);
    font-weight: 700;
}

.intro-quote {
    font-style: italic;
    color: var(--accent-gold);
    margin-top: var(--spacing-sm);
    letter-spacing: 0.2px;
}

.intro-banner__actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

.cta-button {
    display: inline-block;
    padding: 0.95rem 1.6rem;
    background: linear-gradient(120deg, rgba(242, 201, 76, 0.95), rgba(255, 255, 255, 0.9));
    color: var(--bg-dark);
    border-radius: 12px;
    text-decoration: none;
    font-weight: 800;
    border: 1px solid rgba(242, 201, 76, 0.7);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 12px 30px rgba(242, 201, 76, 0.25);
    letter-spacing: 0.2px;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 40px rgba(242, 201, 76, 0.35);
}

.cta-button.ghost {
    background: rgba(255, 255, 255, 0.02);
    color: var(--accent-gold);
    border: 1px solid rgba(242, 201, 76, 0.5);
    box-shadow: none;
}

/* Mobile footer nav (hidden on desktop) */
.mobile-footer-nav {
    display: none;
}

.mobile-nav-btn {
    flex: 1;
    text-align: center;
    padding: 0.75rem;
    background: var(--bg-card);
    color: var(--text-secondary);
    border-top: 1px solid var(--border-gold);
    text-decoration: none;
    font-weight: 600;
    font-family: var(--font-english);
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.2s ease;
}

.mobile-nav-btn:last-child {
    border-right: none;
}

.mobile-nav-btn:hover {
    color: var(--accent-gold);
    background: var(--bg-card-hover);
}

.mobile-nav-btn.disabled {
    opacity: 0.4;
    pointer-events: none;
}

.mobile-nav-menu {
    background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-gold-dark) 100%);
    color: var(--bg-dark);
    border: none;
    cursor: pointer;
    font-weight: 700;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    .logo-line1 {
        font-size: 0.85rem;
    }
    
    .logo-line2 {
        font-size: 0.65rem;
    }
    
    .creator-badge {
        font-size: 0.7rem;
        padding: 0.35rem 0.7rem;
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .intro-banner {
        padding: var(--spacing-md);
    }

    .intro-grid {
        grid-template-columns: 1fr;
    }

    .intro-banner__actions {
        flex-direction: column;
    }

    .mobile-footer-nav {
        display: flex;
        position: sticky;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        background: rgba(5, 8, 16, 0.95);
        backdrop-filter: blur(8px);
    }

    .sidebar {
        transform: translateX(-100%);
        z-index: 999;
        width: 85%;
        max-width: 320px;
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.5);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    /* Smooth sidebar animation */
    .sidebar {
        will-change: transform;
    }
    
    .content-area {
        margin-left: 0;
        width: 100%;
        max-width: 100%;
        transition: margin-left 0.3s ease;
    }
    
    /* Prevent content shift when sidebar opens */
    body.sidebar-open .content-area {
        margin-left: 0;
    }
    
    .hero-title {
        font-size: 1.8rem;
        padding: 0 var(--spacing-sm);
    }
    
    .hero-subtext {
        font-size: 1rem;
        padding: 0 var(--spacing-sm);
    }
    
    .page-title {
        font-size: 1.6rem;
        word-break: break-word;
    }
    
    .page-subtitle {
        font-size: 0.9rem;
    }
    
    .section-heading {
        font-size: 1.4rem;
        word-break: break-word;
    }
    
    .infogrid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .infogrid-card {
        padding: var(--spacing-md);
        /* Better touch interaction */
        touch-action: manipulation;
    }
    
    /* Improve card tap targets */
    .infogrid-card:hover {
        transform: none; /* Disable hover transform on mobile */
    }
    
    .infogrid-card:active {
        transform: scale(0.98);
        transition: transform 0.1s;
    }
    
    .card-title {
        font-size: 1.1rem;
    }
    
    .card-text {
        font-size: 0.95rem;
    }
    
    .text-content {
        padding: var(--spacing-md);
        font-size: 1rem;
    }
    
    .steps-list {
        padding-left: 0;
    }
    
    .step-item {
        padding-left: 2.5rem;
        font-size: 1rem;
        padding-bottom: var(--spacing-sm);
    }
    
    .step-item::before {
        width: 1.75rem;
        height: 1.75rem;
        font-size: 0.9rem;
    }
    
    .quiz-card {
        padding: var(--spacing-md);
    }
    
    .quiz-question {
        font-size: 1.1rem;
    }
    
    .quiz-option {
        font-size: 0.95rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .simulation-block {
        padding: var(--spacing-md);
    }
    
    .sim-button {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
        width: 100%;
        max-width: 300px;
    }
    
    .sim-description {
        font-size: 0.95rem;
    }
    
    .page-navigation {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav-button {
        width: 100%;
        text-align: center;
        padding: 0.875rem 1.25rem;
    }
    
    .nav-center {
        order: -1;
    }
    
    .nav-center p {
        font-size: 0.8rem;
    }
    
    .content-wrapper {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .page-meta {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .meta-pill {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
        display: inline-block;
        width: 100%;
        text-align: center;
    }
    
    /* Better touch targets */
    .nav-button,
    .sim-button,
    .hero-button {
        min-height: 44px;
        min-width: 44px;
        touch-action: manipulation;
    }
    
    /* Prevent text selection on mobile for better UX */
    .mobile-menu-toggle,
    .nav-button,
    .sim-button {
        -webkit-tap-highlight-color: transparent;
        -webkit-touch-callout: none;
        user-select: none;
    }
    
    .topbar {
        padding: 0 var(--spacing-sm);
    }
    
    .topbar-left {
        flex: 1;
        min-width: 0;
    }
    
    .logo-line1 {
        font-size: 0.8rem;
    }
    
    .logo-line2 {
        font-size: 0.65rem;
    }
    
    .creator-badge {
        font-size: 0.7rem;
        padding: 0.3rem 0.6rem;
        display: none;
    }
    
    .brand-statement {
        padding: var(--spacing-xs);
    }
    
    .brand-statement p {
        font-size: 0.8rem;
    }
    
    .chapter-header {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .chapter-title {
        font-size: 0.8rem;
        padding-right: 2rem;
    }
    
    .chapter-code {
        font-size: 0.65rem;
    }
    
    .sidebar-item {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .page-title {
        font-size: 1.3rem;
    }
}

@media (max-width: 480px) {
    .topbar {
        padding: 0 var(--spacing-xs);
        height: 60px;
        position: sticky;
        top: 0;
    }
    
    .logo-line1 {
        font-size: 0.75rem;
        line-height: 1.2;
    }
    
    .logo-line2 {
        font-size: 0.6rem;
        line-height: 1.2;
    }
    
    .creator-badge {
        display: none;
    }
    
    .mobile-menu-toggle {
        padding: 8px 6px;
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .mobile-menu-toggle span {
        width: 22px;
        height: 2.5px;
    }
    
    .topbar-left {
        flex: 1;
        min-width: 0;
        overflow: hidden;
    }
    
    .logo-text {
        min-width: 0;
    }
    
    .hero-title {
        font-size: 1.4rem;
        line-height: 1.3;
    }
    
    .hero-subtext {
        font-size: 0.9rem;
        line-height: 1.6;
    }
    
    .hero-button {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
        width: 100%;
        max-width: 280px;
    }
    
    .page-title {
        font-size: 1.2rem;
        line-height: 1.3;
    }
    
    .page-subtitle {
        font-size: 0.85rem;
    }
    
    .section-heading {
        font-size: 1.2rem;
        line-height: 1.3;
    }
    
    .text-content {
        font-size: 0.95rem;
        padding: var(--spacing-sm);
    }
    
    .infogrid-card {
        padding: var(--spacing-sm);
    }
    
    .card-title {
        font-size: 1rem;
    }
    
    .card-text {
        font-size: 0.9rem;
    }
    
    .step-item {
        font-size: 0.95rem;
        padding-left: 2.25rem;
    }
    
    .step-item::before {
        width: 1.5rem;
        height: 1.5rem;
        font-size: 0.85rem;
    }
    
    .quiz-card {
        padding: var(--spacing-sm);
    }
    
    .quiz-question {
        font-size: 1rem;
    }
    
    .quiz-option {
        font-size: 0.9rem;
    }
    
    .sim-button {
        font-size: 0.95rem;
        padding: 0.75rem 1.25rem;
        width: 100%;
        max-width: 100%;
        touch-action: manipulation;
    }
    
    .sim-button:active {
        transform: scale(0.98);
    }
    
    .content-wrapper {
        padding: var(--spacing-sm) var(--spacing-xs);
    }
    
    .sidebar {
        width: 90%;
        max-width: 90%;
    }
    
    .sidebar-header h3 {
        font-size: 1rem;
    }
    
    .chapter-header {
        padding: var(--spacing-xs);
    }
    
    .chapter-title {
        font-size: 0.75rem;
        padding-right: 1.5rem;
    }
    
    .sidebar-item {
        padding: var(--spacing-xs);
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    .page-title {
        font-size: 1.1rem;
    }
    
    .page-number {
        font-size: 0.65rem;
    }
    
    .sidebar .page-title {
        font-size: 0.75rem;
    }
    
    .meta-pill {
        font-size: 0.75rem;
        padding: 0.35rem 0.7rem;
    }
    
    .nav-button {
        font-size: 0.9rem;
        padding: 0.75rem 1rem;
        width: 100%;
        text-align: center;
        touch-action: manipulation;
    }
    
    .nav-button:active {
        transform: scale(0.98);
    }
    
    .main-footer {
        padding: var(--spacing-sm);
    }
    
    .main-footer p {
        font-size: 0.75rem;
    }
    
    /* Smooth scrolling on mobile */
    html {
        -webkit-overflow-scrolling: touch;
    }
    
    /* Better form elements on mobile */
    input, textarea, select, button {
        font-size: 16px; /* Prevents zoom on iOS */
    }
    
    /* Improve tap targets */
    a, button {
        min-height: 44px;
        min-width: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
    
    /* Better sidebar scroll on mobile */
    .sidebar {
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
    }
}

/* Additional responsive breakpoint for very small devices */
@media (max-width: 360px) {
    .topbar {
        padding: 0 0.5rem;
    }
    
    .logo-line1 {
        font-size: 0.7rem;
    }
    
    .logo-line2 {
        font-size: 0.55rem;
    }
    
    .page-title {
        font-size: 1rem;
    }
    
    .section-heading {
        font-size: 1.1rem;
    }
    
    .text-content {
        font-size: 0.9rem;
        padding: var(--spacing-sm);
    }
    
    .sidebar {
        width: 95%;
        max-width: 95%;
    }
}

/* Mobile overlay for sidebar */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    z-index: 998;
    opacity: 0;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(2px);
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

@media (min-width: 769px) {
    .sidebar-overlay {
        display: none !important;
    }
}