/* ==========================================================================
   CSS Custom Properties - Theme Variables
   ========================================================================== */

:root {
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Container */
  --container-max: 1200px;
  --container-narrow: 800px;
}

/* Dark Theme (Default) */
[data-theme="dark"] {
  --color-bg: #0d0d14;
  --color-bg-elevated: #1a1a2e;
  --color-bg-card: #16213e;
  --color-text: #e8e8e8;
  --color-text-muted: #a0a0a0;
  --color-text-subtle: #6b6b6b;
  --color-accent: #00d4aa;
  --color-accent-hover: #00f5c4;
  --color-secondary: #0088cc;
  --color-border: #2a2a4a;
  --color-border-light: #3a3a5a;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* Light Theme */
[data-theme="light"] {
  --color-bg: #f8f9fa;
  --color-bg-elevated: #ffffff;
  --color-bg-card: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #4a4a6a;
  --color-text-subtle: #7a7a9a;
  --color-accent: #00a888;
  --color-accent-hover: #00c4a0;
  --color-secondary: #0066aa;
  --color-border: #e0e0e8;
  --color-border-light: #d0d0d8;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

.main-content {
  flex: 1;
}

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

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 var(--space-md) 0;
  color: var(--color-text);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin: 0 0 var(--space-md) 0;
}

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

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

blockquote {
  border-left: 4px solid var(--color-accent);
  margin: var(--space-xl) 0;
  padding: var(--space-md) var(--space-xl);
  background: var(--color-bg-elevated);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
}

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

code {
  font-family: var(--font-mono);
  background: var(--color-bg-elevated);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

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

.main-nav {
  display: none;
}

@media (min-width: 768px) {
  .main-nav {
    display: block;
  }
}

.nav-list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-lg);
}

.nav-link {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: var(--space-sm) 0;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--color-text-muted);
  font-size: 1.1rem;
  transition: color var(--transition-fast);
}

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

[data-theme="dark"] #theme-icon-dark { display: none; }
[data-theme="dark"] #theme-icon-light { display: inline; }
[data-theme="light"] #theme-icon-light { display: none; }
[data-theme="light"] #theme-icon-dark { display: inline; }

.mobile-menu-toggle {
  display: block;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--color-text-muted);
  font-size: 1.25rem;
}

@media (min-width: 768px) {
  .mobile-menu-toggle {
    display: none;
  }
}

/* Mobile Navigation */
.main-nav.active {
  display: block;
  position: absolute;
  top: 70px;
  left: 0;
  right: 0;
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md);
}

.main-nav.active .nav-list {
  flex-direction: column;
  gap: 0;
}

.main-nav.active .nav-link {
  display: block;
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

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

.site-footer {
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  padding: var(--space-3xl) 0 var(--space-xl);
  margin-top: var(--space-3xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-section h4 {
  color: var(--color-accent);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

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

.footer-links a {
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.95rem;
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-subtle);
  font-size: 0.9rem;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-accent);
  color: #0d0d14;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #0d0d14;
}

.btn-secondary {
  background: var(--color-secondary);
  color: white;
  border-color: var(--color-secondary);
}

.btn-secondary:hover {
  background: transparent;
  color: var(--color-secondary);
}

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

.btn-outline:hover {
  background: var(--color-accent);
  color: #0d0d14;
}

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

.hero {
  padding: var(--space-3xl) 0;
  background: linear-gradient(180deg, var(--color-bg-elevated) 0%, var(--color-bg) 100%);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

@media (min-width: 768px) {
  .hero-content {
    grid-template-columns: 300px 1fr;
  }
}

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

.book-cover {
  max-width: 280px;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-normal);
}

.book-cover:hover {
  transform: translateY(-8px);
}

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

@media (min-width: 768px) {
  .hero-text {
    text-align: left;
  }
}

.hero-title {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 3rem;
  }
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  font-style: italic;
}

.hero-author {
  font-size: 1rem;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-xl);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

@media (min-width: 768px) {
  .hero-cta {
    justify-content: flex-start;
  }
}

/* ==========================================================================
   Intro Section
   ========================================================================== */

.intro {
  padding: var(--space-3xl) 0;
  text-align: center;
}

.intro-content {
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.intro h2 {
  margin-bottom: var(--space-xl);
}

.intro-text {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.intro .btn {
  margin-top: var(--space-lg);
}

/* ==========================================================================
   Featured Press Section
   ========================================================================== */

.featured-press {
  padding: var(--space-3xl) 0;
  background: var(--color-bg-elevated);
  text-align: center;
}

.featured-press h2 {
  margin-bottom: var(--space-2xl);
}

.press-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.press-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.press-item i {
  font-size: 2rem;
  color: var(--color-accent);
}

/* ==========================================================================
   Page Content
   ========================================================================== */

.page-content {
  padding: var(--space-3xl) 0;
}

.page-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
}

.page-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-muted);
}

.page-body {
  max-width: var(--container-narrow);
  margin: 0 auto;
}

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

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

/* ==========================================================================
   Press Page
   ========================================================================== */

.press-featured {
  margin-bottom: var(--space-3xl);
}

.press-featured-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

@media (min-width: 768px) {
  .press-featured-card {
    grid-template-columns: 1fr 1.5fr;
  }
}

.press-featured-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.press-featured-content {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.press-featured-content h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.press-outlet {
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-md);
}

.press-description {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.press-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.press-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
}

.press-card-icon {
  font-size: 2rem;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.press-card h4 {
  margin-bottom: var(--space-sm);
}

.press-card .press-outlet {
  font-size: 0.9rem;
}

/* ==========================================================================
   About Author
   ========================================================================== */

.author-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: start;
  margin-bottom: var(--space-3xl);
}

@media (min-width: 768px) {
  .author-intro {
    grid-template-columns: 250px 1fr;
  }
}

.author-photo {
  width: 100%;
  max-width: 250px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin: 0 auto;
}

@media (min-width: 768px) {
  .author-photo {
    margin: 0;
  }
}

.author-photo-placeholder {
  width: 100%;
  max-width: 250px;
  aspect-ratio: 1;
  background: var(--color-bg-elevated);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-subtle);
  margin: 0 auto;
}

@media (min-width: 768px) {
  .author-photo-placeholder {
    margin: 0;
  }
}

.ventures-section {
  margin-top: var(--space-3xl);
}

.ventures-section h3 {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.ventures-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
}

.venture-card {
  text-align: center;
  padding: var(--space-xl);
}

.venture-card i {
  font-size: 2.5rem;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.venture-card h4 {
  margin-bottom: var(--space-sm);
}

.venture-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
}

/* ==========================================================================
   Sample Chapter
   ========================================================================== */

.chapter-content {
  font-size: 1.1rem;
  line-height: 1.8;
}

.chapter-content p {
  margin-bottom: var(--space-lg);
  text-indent: 1.5em;
}

.chapter-content p:first-of-type {
  text-indent: 0;
}

.chapter-content p:first-of-type::first-letter {
  font-size: 3.5rem;
  float: left;
  line-height: 1;
  padding-right: var(--space-sm);
  color: var(--color-accent);
  font-weight: 700;
}

.chapter-title {
  text-align: center;
  font-size: 1.75rem;
  margin-bottom: var(--space-xl);
  color: var(--color-accent);
}

.chapter-epigraph {
  text-align: center;
  font-style: italic;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3xl);
  padding: var(--space-xl);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.chapter-cta {
  text-align: center;
  padding: var(--space-2xl);
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  margin-top: var(--space-3xl);
}

.chapter-cta h3 {
  margin-bottom: var(--space-md);
}

.chapter-cta p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

/* ==========================================================================
   Contact Page
   ========================================================================== */

.contact-methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  max-width: 700px;
  margin: 0 auto;
}

.contact-card {
  text-align: center;
  padding: var(--space-2xl);
}

.contact-card i {
  font-size: 3rem;
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
}

.contact-card h3 {
  margin-bottom: var(--space-sm);
}

.contact-card p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

/* ==========================================================================
   Praise/Reviews
   ========================================================================== */

.praise-section {
  margin: var(--space-3xl) 0;
}

.praise-section h2 {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.praise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.praise-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.praise-quote {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  position: relative;
  padding-left: var(--space-xl);
}

.praise-quote::before {
  content: '\201C';
  position: absolute;
  left: 0;
  top: -10px;
  font-size: 3rem;
  color: var(--color-accent);
  opacity: 0.5;
  line-height: 1;
}

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

/* ==========================================================================
   Responsive Adjustments
   ========================================================================== */

@media (max-width: 767px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .hero-title {
    font-size: 2rem;
  }

  .page-title {
    font-size: 2rem;
  }

  .btn {
    width: 100%;
  }
}