/* Solo-Millionär Book - Premium Design */

:root {
  /* Color Palette */
  --color-bg: #faf9f7;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #6b6b6b;
  --color-text-light: #9a9a9a;
  --color-accent: #c9a227;
  --color-accent-dark: #a88520;
  --color-accent-light: #f5e6b8;
  --color-border: #e8e6e3;
  --color-sidebar-bg: #f5f4f2;

  /* Typography */
  --font-serif: 'DM Serif Display', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* 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;

  /* Layout */
  --sidebar-width: 280px;
  --header-height: 64px;
  --content-max-width: 720px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--color-text);
}

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

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: -0.02em;
}

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

.cta-button {
  display: inline-flex;
  align-items: center;
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-accent);
  color: #fff;
  font-weight: 500;
  font-size: 0.875rem;
  text-decoration: none;
  border-radius: 6px;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.cta-button:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Book Layout */
.book-layout {
  display: flex;
  min-height: 100vh;
  padding-top: var(--header-height);
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--color-sidebar-bg);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  transition: transform var(--transition-base);
  z-index: 50;
}

.chapter-nav {
  padding: var(--space-xl);
}

.nav-title {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.chapter-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.chapter-item {
  border-radius: 8px;
  transition: background var(--transition-fast);
}

.chapter-item:hover {
  background: rgba(0, 0, 0, 0.03);
}

.chapter-item.active {
  background: var(--color-surface);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.chapter-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}

.chapter-item.active .chapter-link {
  color: var(--color-accent-dark);
  font-weight: 500;
}

.chapter-emoji {
  font-size: 1.125rem;
  flex-shrink: 0;
}

.chapter-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.pdf-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  border-radius: 8px;
  transition: all var(--transition-fast);
}

.pdf-link:hover {
  background: rgba(0, 0, 0, 0.03);
  color: var(--color-text);
}

.pdf-icon {
  font-size: 1rem;
}

/* Mobile Sidebar Overlay */
.mobile-sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 40;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.mobile-sidebar-overlay.active {
  opacity: 1;
}

/* Main Content */
.content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: var(--space-3xl) var(--space-xl);
  display: flex;
  justify-content: center;
}

.chapter {
  width: 100%;
  max-width: var(--content-max-width);
  animation: fadeIn var(--transition-slow) ease;
}

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

/* Chapter Header */
.chapter-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.chapter-number {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.chapter-header-emoji {
  font-size: 1.5rem;
}

/* Chapter Content - Typography */
.chapter-content {
  color: var(--color-text);
}

.chapter-content h1 {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xl);
  color: var(--color-text);
}

.chapter-content h2 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-lg);
  color: var(--color-text);
}

.chapter-content h3 {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

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

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

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

.chapter-content em {
  font-style: italic;
}

.chapter-content a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-light);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition-fast);
}

.chapter-content a:hover {
  text-decoration-color: var(--color-accent);
}

/* Lists */
.chapter-content ul,
.chapter-content ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.chapter-content li {
  margin-bottom: var(--space-sm);
}

.chapter-content li::marker {
  color: var(--color-accent);
}

/* Blockquotes */
.chapter-content blockquote {
  margin: var(--space-xl) 0;
  padding: var(--space-lg) var(--space-xl);
  background: var(--color-accent-light);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 8px 8px 0;
  font-style: italic;
}

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

/* Code */
.chapter-content code {
  font-family: 'SF Mono', Monaco, 'Courier New', monospace;
  font-size: 0.875em;
  background: rgba(0, 0, 0, 0.05);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.chapter-content pre {
  margin: var(--space-xl) 0;
  padding: var(--space-lg);
  background: #2d2d2d;
  border-radius: 8px;
  overflow-x: auto;
}

.chapter-content pre code {
  background: none;
  padding: 0;
  color: #f8f8f2;
}

/* Horizontal Rule */
.chapter-content hr {
  border: none;
  height: 1px;
  background: var(--color-border);
  margin: var(--space-3xl) 0;
}

/* Images */
.chapter-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: var(--space-xl) 0;
}

/* Pagination */
.chapter-pagination {
  display: flex;
  justify-content: space-between;
  gap: var(--space-lg);
  margin-top: var(--space-3xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--color-border);
}

.pagination-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  text-decoration: none;
  transition: all var(--transition-fast);
  max-width: 45%;
}

.pagination-link:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(201, 162, 39, 0.1);
  transform: translateY(-2px);
}

.pagination-link.next {
  text-align: right;
  margin-left: auto;
}

.pagination-link.cta {
  background: var(--color-accent-light);
  border-color: var(--color-accent);
}

.pagination-link.cta:hover {
  background: var(--color-accent);
}

.pagination-link.cta:hover .pagination-title,
.pagination-link.cta:hover .pagination-direction {
  color: #fff;
}

.pagination-direction {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.pagination-title {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  color: var(--color-text);
}

.pagination-placeholder {
  flex: 1;
}

/* Mobile Styles */
@media (max-width: 900px) {
  :root {
    --sidebar-width: 280px;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .mobile-sidebar-overlay {
    display: block;
    pointer-events: none;
  }

  .mobile-sidebar-overlay.active {
    pointer-events: auto;
  }

  .content {
    margin-left: 0;
    padding: var(--space-xl) var(--space-lg);
  }

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

  .chapter-content h2 {
    font-size: 1.5rem;
  }
}

@media (max-width: 600px) {
  .header-inner {
    padding: 0 var(--space-md);
  }

  .logo-text {
    font-size: 1rem;
  }

  .cta-button {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.8125rem;
  }

  .content {
    padding: var(--space-lg) var(--space-md);
  }

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

  .chapter-content h2 {
    font-size: 1.375rem;
  }

  .chapter-content h3 {
    font-size: 1.0625rem;
  }

  .chapter-pagination {
    flex-direction: column;
  }

  .pagination-link {
    max-width: 100%;
  }

  .pagination-link.next {
    text-align: left;
  }
}

/* Focus States for Accessibility */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Selection */
::selection {
  background: var(--color-accent-light);
  color: var(--color-text);
}