/* BookBindGuide - Styles */

/* CSS Variables */
:root {
  --color-primary: #8B4513;
  --color-primary-dark: #654321;
  --color-primary-light: #A0522D;
  --color-secondary: #D2691E;
  --color-accent: #DEB887;
  --color-background: #FDF5E6;
  --color-surface: #FFFFFF;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-muted: #999999;
  --color-border: #E0D5C7;
  --color-success: #2E7D32;
  --color-warning: #F57C00;
  --color-beginner: #4CAF50;
  --color-intermediate: #FF9800;
  --color-advanced: #F44336;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --transition: 0.3s ease;
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
}

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

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

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

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-primary-dark);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; margin-bottom: 1rem; }
h3 { font-size: 1.5rem; margin-bottom: 0.75rem; }
h4 { font-size: 1.25rem; margin-bottom: 0.5rem; }

p {
  margin-bottom: 1rem;
}

/* Navigation */
.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 20px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: rgba(255,255,255,0.9);
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: white;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.mobile-menu-btn span {
  display: block;
  width: 25px;
  height: 2px;
  background: white;
  transition: var(--transition);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white;
  min-height: 60vh;
  display: flex;
  flex-direction: column;
}

.hero-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 3rem 20px;
}

.hero h1 {
  color: white;
  font-size: 3rem;
  margin-bottom: 1rem;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero p {
  font-size: 1.25rem;
  opacity: 0.9;
  max-width: 600px;
  margin-bottom: 2rem;
}

.cta-btn {
  display: inline-block;
  background: white;
  color: var(--color-primary);
  padding: 1rem 2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1.1rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--color-primary-dark);
}

/* Sections */
.section {
  padding: 5rem 0;
}

.section:nth-child(even) {
  background-color: var(--color-surface);
}

.section-intro {
  font-size: 1.1rem;
  color: var(--color-text-light);
  max-width: 800px;
  margin-bottom: 3rem;
}

/* Intro Section */
.intro-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature {
  background: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition);
}

.feature:hover {
  transform: translateY(-5px);
}

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

.feature h3 {
  margin-bottom: 0.5rem;
}

.feature p {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* Technique Cards */
.technique-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.technique-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  border-left: 4px solid var(--color-primary);
}

.technique-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.technique-header h3 {
  margin-bottom: 0;
}

.difficulty {
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
}

.difficulty.beginner {
  background: rgba(76, 175, 80, 0.15);
  color: var(--color-beginner);
}

.difficulty.intermediate {
  background: rgba(255, 152, 0, 0.15);
  color: var(--color-intermediate);
}

.difficulty.advanced {
  background: rgba(244, 67, 54, 0.15);
  color: var(--color-advanced);
}

.technique-card ol {
  padding-left: 1.5rem;
  margin: 1rem 0;
}

.technique-card li {
  margin-bottom: 0.5rem;
}

.pro-tip {
  background: var(--color-background);
  padding: 1rem;
  border-radius: var(--radius-md);
  margin-top: 1rem;
  margin-bottom: 0;
  border-left: 3px solid var(--color-secondary);
}

/* Tools Section */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.tool-card {
  background: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.tool-uses {
  list-style: none;
  margin: 1rem 0;
}

.tool-uses li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
}

.tool-uses li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: bold;
}

.tool-tip {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* Materials Section */
.materials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.material-card {
  background: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.material-details {
  background: var(--color-background);
  padding: 1rem;
  border-radius: var(--radius-md);
  margin: 1rem 0;
}

.material-details h4 {
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.material-details ul {
  margin: 0;
  padding-left: 1.25rem;
}

.material-details li {
  margin-bottom: 0.25rem;
}

/* Projects Section */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.project-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  display: flex;
  overflow: hidden;
}

.project-number {
  background: var(--color-primary);
  color: white;
  font-size: 2.5rem;
  font-weight: 700;
  min-width: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-content {
  padding: 2rem;
  flex: 1;
}

.project-time {
  color: var(--color-secondary);
  font-weight: 500;
  margin-bottom: 1rem;
}

.project-content h4 {
  margin-top: 1.5rem;
}

.project-content ul,
.project-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.project-content li {
  margin-bottom: 0.5rem;
}

/* Troubleshooting */
.troubleshoot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.troubleshoot-card {
  background: var(--color-surface);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-warning);
}

.troubleshoot-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.troubleshoot-card p {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.troubleshoot-card p:last-child {
  margin-bottom: 0;
}

/* Recommendations Section */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.product-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  position: relative;
  display: flex;
  flex-direction: column;
}

.product-card.featured {
  border: 2px solid var(--color-secondary);
}

.product-badge {
  position: absolute;
  top: -10px;
  left: 20px;
  background: var(--color-secondary);
  color: white;
  padding: 0.25rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

.product-card h3 {
  margin-top: 0.5rem;
}

.product-features {
  list-style: none;
  margin: 1rem 0;
  flex: 1;
}

.product-features li {
  padding: 0.35rem 0;
  padding-left: 1.5rem;
  position: relative;
  font-size: 0.95rem;
}

.product-features li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  color: var(--color-success);
}

.product-btn {
  display: inline-block;
  background: var(--color-primary);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  text-align: center;
  transition: background var(--transition), transform var(--transition);
}

.product-btn:hover {
  background: var(--color-primary-dark);
  color: white;
  transform: translateY(-2px);
}

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

.glossary-term {
  background: var(--color-surface);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.glossary-term dt {
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.glossary-term dd {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Footer */
.footer {
  background: var(--color-primary-dark);
  color: white;
  padding: 4rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-section h4 {
  color: white;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.footer-section p {
  color: rgba(255,255,255,0.8);
  font-size: 0.95rem;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: rgba(255,255,255,0.8);
  transition: color var(--transition);
}

.footer-section a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.2);
  padding-top: 2rem;
  text-align: center;
}

.affiliate-disclosure {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 1rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.footer-bottom p:last-child {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 0;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-primary-dark);
    flex-direction: column;
    padding: 1rem;
    gap: 0;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links li {
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

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

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  .section {
    padding: 3rem 0;
  }

  .technique-grid,
  .tools-grid,
  .materials-grid,
  .product-grid {
    grid-template-columns: 1fr;
  }

  .project-card {
    flex-direction: column;
  }

  .project-number {
    min-width: auto;
    padding: 1rem;
    font-size: 1.5rem;
  }

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

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .technique-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

/* Smooth Scroll Offset for Fixed Nav */
section[id] {
  scroll-margin-top: 20px;
}

/* Print Styles */
@media print {
  .hero,
  .nav-container,
  .footer,
  .product-btn,
  .cta-btn {
    display: none;
  }

  .section {
    padding: 1rem 0;
    break-inside: avoid;
  }

  body {
    background: white;
    color: black;
  }
}