/**
 * C. J. Steen Author Website - Main Stylesheet
 *
 * Structure:
 * 1. CSS Variables (Dark/Light Themes)
 * 2. Reset & Base Styles
 * 3. Typography
 * 4. Layout Components
 * 5. Header & Navigation
 * 6. Hero Section
 * 7. Book Components
 * 8. Timeline
 * 9. Forms
 * 10. Cards
 * 11. Footer
 * 12. Cookie Banner
 * 13. Utilities
 * 14. Animations
 * 15. Responsive Breakpoints
 */

/* ============================================
   1. CSS Variables - Theme System
   ============================================ */

:root {
    /* Dark Theme (Default) */
    --bg-primary: #0a0f1a;
    --bg-secondary: #121a2e;
    --bg-tertiary: #0d1321;
    --bg-card: #1a2540;
    --bg-card-hover: #223052;
    --bg-input: #151d30;

    --text-primary: #e8e8e8;
    --text-secondary: #a0a0a0;
    --text-muted: #9ca3af;
    --text-inverse: #0a0f1a;

    --accent: #d4a853;
    --accent-hover: #f4c873;
    --accent-dark: #b8860b;
    --accent-glow: rgba(212, 168, 83, 0.3);
    --accent-subtle: rgba(212, 168, 83, 0.1);

    --border-color: rgba(212, 168, 83, 0.2);
    --border-subtle: rgba(255, 255, 255, 0.05);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px var(--accent-glow);

    --overlay-dark: rgba(10, 15, 26, 0.85);
    --overlay-medium: rgba(10, 15, 26, 0.6);
    --overlay-light: rgba(10, 15, 26, 0.3);

    /* Typography */
    --font-heading: 'Libre Baskerville', Georgia, 'Times New Roman', serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Mono', monospace;

    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    --spacing-5xl: 8rem;

    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;
    --container-wide: 1400px;
    --header-height: 80px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    --transition-slower: 800ms ease;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* Z-Index Scale */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-tooltip: 600;
    --z-toast: 700;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f0f2f5;
    --bg-card: #ffffff;
    --bg-card-hover: #f5f5f5;
    --bg-input: #ffffff;

    --text-primary: #1a1a2e;
    --text-secondary: #4a4a5a;
    --text-muted: #6b7280;
    --text-inverse: #ffffff;

    --accent: #b8860b;
    --accent-hover: #d4a853;
    --accent-dark: #8b6508;
    --accent-glow: rgba(184, 134, 11, 0.2);
    --accent-subtle: rgba(184, 134, 11, 0.08);

    --border-color: rgba(26, 26, 46, 0.15);
    --border-subtle: rgba(0, 0, 0, 0.05);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 30px var(--accent-glow);

    --overlay-dark: rgba(248, 249, 250, 0.95);
    --overlay-medium: rgba(248, 249, 250, 0.8);
    --overlay-light: rgba(248, 249, 250, 0.5);
}

/* ============================================
   2. Reset & Base Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
    min-height: 100vh;
}

::selection {
    background-color: var(--accent);
    color: var(--text-inverse);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

a:hover {
    color: var(--accent-hover);
}

button {
    font-family: inherit;
    cursor: pointer;
}

/* ============================================
   3. Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 {
    font-size: clamp(var(--text-3xl), 5vw, var(--text-6xl));
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(var(--text-xl), 3vw, var(--text-2xl));
}

h4 {
    font-size: var(--text-lg);
}

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

.lead {
    font-size: var(--text-lg);
    line-height: 1.7;
    color: var(--text-secondary);
}

.text-accent {
    color: var(--accent);
}

.text-muted {
    color: var(--text-muted);
}

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

/* ============================================
   4. Layout Components
   ============================================ */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-narrow {
    max-width: var(--container-narrow);
}

.container-wide {
    max-width: var(--container-wide);
}

.section {
    padding: var(--spacing-5xl) 0;
}

.section-sm {
    padding: var(--spacing-3xl) 0;
}

.section-alt {
    background-color: var(--bg-secondary);
}

.section-dark {
    background-color: var(--bg-tertiary);
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ============================================
   5. Header & Navigation
   ============================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    padding: var(--spacing-md) 0;
    background: linear-gradient(to bottom, var(--bg-primary), transparent);
    transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

.header.scrolled {
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.02em;
    transition: color var(--transition-fast);
}

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

.logo span {
    color: var(--accent);
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-links a {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    position: relative;
    padding: var(--spacing-xs) 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition-normal);
}

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

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Language Switcher */
.language-switcher {
    position: relative;
}

.language-current {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.language-current:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.language-dropdown {
    position: absolute;
    top: calc(100% + var(--spacing-sm));
    right: 0;
    min-width: 150px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
}

.language-switcher:hover .language-dropdown,
.language-switcher:focus-within .language-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-dropdown li a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}

.language-dropdown li a:hover,
.language-dropdown li a.active {
    background: var(--accent-subtle);
    color: var(--accent);
}

.language-dropdown li:first-child a {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.language-dropdown li:last-child a {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: var(--text-lg);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: var(--text-2xl);
    padding: var(--spacing-sm);
    cursor: pointer;
}

.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    z-index: var(--z-modal);
}

.mobile-nav.open {
    display: block;
}

.mobile-nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.mobile-nav-links a {
    display: block;
    font-size: var(--text-xl);
    color: var(--text-primary);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border-subtle);
}

/* ============================================
   6. Hero Section
   ============================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    filter: brightness(0.4);
    transform: scale(1.1);
    will-change: transform;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        to bottom,
        rgba(10, 15, 26, 0.2) 0%,
        rgba(10, 15, 26, 0.5) 50%,
        var(--bg-primary) 100%
    );
}

[data-theme="light"] .hero-overlay {
    background: linear-gradient(
        to bottom,
        rgba(248, 249, 250, 0.1) 0%,
        rgba(248, 249, 250, 0.5) 50%,
        var(--bg-primary) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 10;
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-4xl);
    align-items: center;
    max-width: var(--container-max);
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.hero-book {
    display: flex;
    justify-content: center;
}

.hero-book-link {
    display: block;
    position: relative;
    text-decoration: none;
    cursor: pointer;
}

.hero-book-link:hover .book-cover {
    transform: scale(1.05);
}

.hero-book-cta {
    display: block;
    text-align: center;
    margin-top: 1rem;
    color: var(--accent);
    font-size: 0.95rem;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.hero-book-link:hover .hero-book-cta {
    opacity: 1;
    text-decoration: underline;
}

.book-cover {
    width: 300px;
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: float 6s ease-in-out infinite;
    transition: transform var(--transition-normal);
}

.book-cover:hover {
    transform: scale(1.03) translateY(-5px);
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
}

.hero-text h1 {
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.hero-tagline {
    font-size: var(--text-xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    animation: bounce 2s infinite;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.scroll-indicator svg {
    width: 24px;
    height: 24px;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ============================================
   7. Book Components
   ============================================ */

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.book-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.book-card:hover,
.book-card:focus-within {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.book-card-cover {
    position: relative;
    aspect-ratio: 2/3;
    overflow: hidden;
}

.book-card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.book-card:hover .book-card-cover img {
    transform: scale(1.05);
}

.book-card-content {
    padding: var(--spacing-lg);
}

.book-card-title {
    font-size: var(--text-lg);
    margin-bottom: var(--spacing-xs);
}

.book-card-series {
    font-size: var(--text-sm);
    color: var(--accent);
    margin-bottom: var(--spacing-sm);
}

.book-card-excerpt {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

/* Retailer Buttons */
.retailer-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.retailer-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 500;
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}

.retailer-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

.retailer-btn svg,
.retailer-btn img {
    width: 20px;
    height: 20px;
}

/* Synopsis */
.synopsis {
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.synopsis-text {
    font-size: var(--text-lg);
    line-height: 1.8;
    color: var(--text-secondary);
}

.synopsis-text p {
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   8. Timeline
   ============================================ */

.timeline-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.timeline-phases {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.timeline-phase {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.timeline-phase::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.timeline-phase:hover::before {
    transform: scaleX(1);
}

.timeline-phase:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.phase-number {
    font-size: var(--text-5xl);
    font-weight: 700;
    color: var(--accent);
    opacity: 0.2;
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.phase-title {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    margin-bottom: var(--spacing-sm);
}

.phase-date {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

/* Full Timeline Page */
.timeline-full {
    position: relative;
    padding: var(--spacing-xl) 0;
}

.timeline-line {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
    transform: translateX(-50%);
}

.timeline-event {
    position: relative;
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--spacing-3xl);
}

.timeline-event:nth-child(odd) {
    flex-direction: row-reverse;
    text-align: right;
}

.timeline-event-content {
    width: calc(50% - var(--spacing-xl));
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.timeline-event-dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 16px;
    height: 16px;
    background: var(--accent);
    border: 3px solid var(--bg-primary);
    border-radius: var(--radius-full);
    z-index: 10;
}

/* Timeline Event Cards (full page) */
.timeline-event-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    position: relative;
    transition: all var(--transition-normal);
}

.timeline-event-card:hover,
.timeline-event-card:focus-within {
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.timeline-event-card .event-indicator {
    position: absolute;
    left: -1px;
    top: var(--spacing-xl);
    width: 4px;
    height: 40px;
    background: var(--accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.timeline-event-card .event-icon {
    width: 48px;
    height: 48px;
    background: var(--accent-subtle);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--accent);
    font-size: var(--text-xl);
}

.timeline-event-card .event-content {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.timeline-event-card .event-title {
    font-size: var(--text-lg);
    margin-bottom: var(--spacing-sm);
}

.timeline-event-card .event-description {
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.7;
}

/* ============================================
   9. Forms
   ============================================ */

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: var(--text-base);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.form-checkbox input {
    width: 20px;
    height: 20px;
    accent-color: var(--accent);
    margin-top: 2px;
}

.form-checkbox label {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.5;
}

.form-error {
    color: #ef4444;
    font-size: var(--text-sm);
    margin-top: var(--spacing-xs);
}

.form-success {
    color: #22c55e;
    font-size: var(--text-sm);
    margin-top: var(--spacing-xs);
}

/* Newsletter Form */
.newsletter-form {
    display: flex;
    gap: var(--spacing-md);
    max-width: 500px;
    margin: 0 auto;
}

.newsletter-form .form-input {
    flex: 1;
}

/* ============================================
   10. Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: var(--text-inverse);
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
    background: var(--accent-hover);
    color: var(--text-inverse);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--accent-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-outline {
    background: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
}

.btn-outline:hover {
    background: var(--accent);
    color: var(--text-inverse);
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--text-xs);
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--text-base);
}

/* ============================================
   11. Cards
   ============================================ */

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
}

.card-header {
    margin-bottom: var(--spacing-lg);
}

.card-title {
    font-size: var(--text-xl);
    margin-bottom: var(--spacing-xs);
}

.card-subtitle {
    color: var(--text-muted);
    font-size: var(--text-sm);
}

/* Article Cards */
.article-card {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.article-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
}

.article-card-image {
    aspect-ratio: 4/3;
    overflow: hidden;
}

.article-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.article-card:hover .article-card-image img {
    transform: scale(1.05);
}

.article-card-content {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.article-card-meta {
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.article-card-title {
    font-size: var(--text-lg);
    margin-bottom: var(--spacing-sm);
}

.article-card-excerpt {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.6;
}

/* ============================================
   12. Footer
   ============================================ */

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.footer-tagline {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    margin-bottom: var(--spacing-lg);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--text-inverse);
}

.footer-heading {
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-subtle);
}

.footer-copyright {
    color: var(--text-muted);
    font-size: var(--text-sm);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-legal a {
    color: var(--text-muted);
    font-size: var(--text-sm);
}

.footer-legal a:hover {
    color: var(--accent);
}

/* ============================================
   13. Cookie Banner
   ============================================ */

.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    z-index: var(--z-toast);
    transform: translateY(100%);
    transition: transform var(--transition-normal);
}

.cookie-banner.show {
    transform: translateY(0);
}

.cookie-content {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.cookie-text {
    flex: 1;
    min-width: 300px;
    color: var(--text-secondary);
    font-size: var(--text-sm);
}

.cookie-buttons {
    display: flex;
    gap: var(--spacing-md);
}

/* ============================================
   14. Utilities
   ============================================ */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Skip to content link */
.skip-link {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: var(--text-inverse);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--spacing-md);
    outline: none;
}

/* Enhanced focus-visible styles for accessibility */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Remove default focus outline when using focus-visible */
:focus:not(:focus-visible) {
    outline: none;
}

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.py-sm { padding-top: var(--spacing-sm); padding-bottom: var(--spacing-sm); }
.py-md { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
.py-lg { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }

.px-sm { padding-left: var(--spacing-sm); padding-right: var(--spacing-sm); }
.px-md { padding-left: var(--spacing-md); padding-right: var(--spacing-md); }
.px-lg { padding-left: var(--spacing-lg); padding-right: var(--spacing-lg); }

/* ============================================
   15. Animations
   ============================================ */

.fade-in {
    opacity: 0;
    transform: translateY(30px);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in {
    opacity: 0;
    transform: scale(0.9);
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

/* Stagger animations */
.stagger > * {
    opacity: 0;
    transform: translateY(20px);
}

.stagger.visible > *:nth-child(1) { transition-delay: 0ms; }
.stagger.visible > *:nth-child(2) { transition-delay: 100ms; }
.stagger.visible > *:nth-child(3) { transition-delay: 200ms; }
.stagger.visible > *:nth-child(4) { transition-delay: 300ms; }
.stagger.visible > *:nth-child(5) { transition-delay: 400ms; }
.stagger.visible > *:nth-child(6) { transition-delay: 500ms; }

.stagger.visible > * {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

/* ============================================
   16. Responsive Breakpoints
   ============================================ */

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-2xl);
    }

    .hero-text {
        order: 2;
    }

    .hero-book {
        order: 1;
    }

    .hero-tagline {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-cta {
        justify-content: center;
    }

    .timeline-phases {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .section {
        padding: var(--spacing-3xl) 0;
    }

    .book-cover {
        width: 240px;
    }

    .timeline-phases {
        grid-template-columns: 1fr;
    }

    .newsletter-form {
        flex-direction: column;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .article-card {
        grid-template-columns: 1fr;
    }

    .article-card-image {
        aspect-ratio: 16/9;
    }

    /* Timeline mobile layout */
    .timeline-line {
        left: 20px;
    }

    .timeline-event {
        flex-direction: column !important;
        padding-left: 50px;
    }

    .timeline-event-content {
        width: 100%;
        text-align: left !important;
    }

    .timeline-event-dot {
        left: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .book-cover {
        width: 200px;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .cookie-content {
        flex-direction: column;
        text-align: center;
    }

    .cookie-buttons {
        width: 100%;
        flex-direction: column;
    }

    .cookie-buttons .btn {
        width: 100%;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .book-cover {
        animation: none;
    }

    .scroll-indicator {
        animation: none;
    }
}

/* ============================================
   16. Chapter Preview & Audio Player
   ============================================ */

/* Chapter Preview Section */
.chapter-preview-section {
    padding: 4rem 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.chapter-preview-header {
    text-align: center;
    margin-bottom: 3rem;
}

.chapter-preview-header h2 {
    font-family: var(--font-serif);
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.chapter-preview-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* Chapter Tabs */
.chapter-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.chapter-tab {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    /* Safari mobile fixes */
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    position: relative;
    z-index: 1;
}

.chapter-tab:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.chapter-tab.active {
    background: var(--accent);
    color: var(--text-inverse);
    border-color: var(--accent);
}

.chapter-tab svg {
    width: 20px;
    height: 20px;
}

/* Chapter Text Content */
.chapter-text-container {
    max-width: 750px;
    margin: 0 auto;
}

.chapter-content {
    display: none;
}

.chapter-content.active {
    display: block;
}

.chapter-text {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    line-height: 2;
    color: var(--text-secondary);
}

.chapter-text h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--text-primary);
    margin: 2rem 0 1rem;
    text-align: center;
}

.chapter-text .chapter-date {
    text-align: center;
    font-style: italic;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.chapter-text p {
    margin-bottom: 1.5rem;
    text-indent: 2em;
}

.chapter-text .first-paragraph {
    text-indent: 0;
}

.chapter-text .first-paragraph::first-letter {
    font-size: 3.5rem;
    float: left;
    line-height: 1;
    margin-right: 0.5rem;
    margin-top: 0.1rem;
    color: var(--accent);
    font-family: var(--font-serif);
}

.chapter-text em {
    color: var(--text-primary);
}

.chapter-text hr {
    border: none;
    height: 1px;
    background: var(--border-color);
    margin: 3rem auto;
    max-width: 100px;
}

/* Continue Reading CTA */
.chapter-continue-cta {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.chapter-continue-cta p {
    color: var(--text-muted);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Audio Player */
.audio-player {
    max-width: 600px;
    margin: 0 auto;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-card) 100%);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    user-select: none;
    -webkit-user-select: none;
}

.audio-player-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.audio-icon {
    font-size: 1.5rem;
}

.audio-title {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    color: var(--text-primary);
}

.audio-track-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-subtle);
}

.track-name {
    font-weight: 500;
    color: var(--accent);
}

.track-narrator {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.audio-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.audio-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.audio-btn:hover {
    color: var(--accent);
    background: var(--accent-subtle);
}

.audio-btn-play {
    width: 48px;
    height: 48px;
    background: var(--accent);
    color: var(--text-inverse);
    flex-shrink: 0;
}

.audio-btn-play:hover {
    background: var(--accent-hover);
    color: var(--text-inverse);
    transform: scale(1.05);
}

.audio-btn-play.playing {
    background: var(--accent-dark);
}

.audio-progress-container {
    flex: 1;
    min-width: 0;
}

.audio-progress-bar {
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    cursor: pointer;
    position: relative;
    margin-bottom: 0.5rem;
}

.audio-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-hover) 100%);
    border-radius: 3px;
    width: 0%;
    transition: width 0.1s linear;
}

.audio-progress-handle {
    position: absolute;
    top: 50%;
    left: 0%;
    transform: translate(-50%, -50%);
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.audio-progress-bar:hover .audio-progress-handle {
    opacity: 1;
}

.audio-time {
    display: flex;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.time-separator {
    margin: 0 0.25rem;
}

.audio-volume {
    position: relative;
}

.volume-slider-container {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem 0.5rem;
    margin-bottom: 0.5rem;
}

.volume-slider {
    -webkit-appearance: none;
    width: 80px;
    height: 4px;
    background: var(--bg-input);
    border-radius: 2px;
    outline: none;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

.volume-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

/* Playlist */
.audio-playlist {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.playlist-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    color: var(--text-secondary);
}

.playlist-item:hover {
    background: var(--bg-input);
    border-color: var(--border-subtle);
}

.playlist-item.active {
    background: var(--accent-subtle);
    border-color: var(--accent);
    color: var(--text-primary);
}

.playlist-number {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-input);
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 600;
}

.playlist-item.active .playlist-number {
    background: var(--accent);
    color: var(--text-inverse);
}

.playlist-title {
    flex: 1;
    font-size: 0.9rem;
}

.playlist-duration {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

/* Release Banner */
.release-banner {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: var(--text-inverse);
    text-align: center;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
}

.release-banner strong {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.release-banner span {
    opacity: 0.9;
    font-size: 0.9rem;
}

/* Audio Player Responsive */
@media (max-width: 640px) {
    .audio-player {
        padding: 1rem;
        margin: 0 -0.5rem;
        border-radius: 12px;
    }

    .audio-player-header {
        margin-bottom: 0.75rem;
    }

    .audio-title {
        font-size: 1.1rem;
    }

    .audio-track-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
        margin-bottom: 1rem;
        padding-bottom: 0.75rem;
    }

    .audio-controls {
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .audio-btn-play {
        width: 52px;
        height: 52px;
    }

    .audio-progress-container {
        width: 100%;
        order: 3;
        margin-top: 0.5rem;
    }

    .audio-progress-bar {
        height: 8px;
        touch-action: none;
    }

    .audio-progress-handle {
        width: 18px;
        height: 18px;
        opacity: 1;
    }

    /* Hide volume on mobile - iOS doesn't support programmatic volume */
    .audio-volume {
        display: none;
    }

    .audio-playlist {
        margin-top: 0.75rem;
        padding-top: 0.75rem;
    }

    .playlist-item {
        padding: 0.875rem 1rem;
    }

    .chapter-tabs {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .chapter-tab {
        justify-content: center;
        padding: 1rem 1.5rem;
        min-height: 54px;
        /* Safari mobile explicit styles */
        -webkit-tap-highlight-color: transparent;
        -webkit-appearance: none;
        background-color: #1a1f2e; /* fallback for var(--bg-tertiary) */
        background-color: var(--bg-tertiary);
        border: 1px solid #2a3040;
        border-color: var(--border-color);
        color: #a0a8b8;
        color: var(--text-secondary);
    }

    .chapter-tab.active {
        background-color: #d4a853;
        background-color: var(--accent);
        color: #0a0f1a;
        color: var(--text-inverse);
        border-color: #d4a853;
        border-color: var(--accent);
    }

    .chapter-text {
        font-size: 1.05rem;
        line-height: 1.8;
    }

    .chapter-text .first-paragraph::first-letter {
        font-size: 2.8rem;
    }
}