/*
  Hentai.biz - Modern Academic Design System
  A professional, clean, and educational aesthetic
*/

/* ==================== CSS Variables ==================== */
:root {
  /* Color Palette */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-secondary: #7c3aed;
  --color-accent: #f59e0b;
  --color-white: #ffffff;
  --color-background: #f9fafb;
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

  --color-text-primary: #1a1a2e;
  --color-text-secondary: #4b5563;
  --color-text-light: #6b7280;

  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;

  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;

  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;

  /* 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;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
}

/* ==================== 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-primary);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
  overflow-x: hidden;
}

/* ==================== Typography ==================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

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

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

a:hover {
  color: var(--color-primary-dark);
}

/* ==================== Layout ==================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

/* ==================== Safety Banner ==================== */
.safety-banner {
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  border-bottom: 2px solid #f59e0b;
  padding: var(--spacing-sm) var(--spacing-lg);
  text-align: center;
  animation: slideDown 0.5s ease-out;
}

.safety-banner .container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: #78350f;
}

.safety-icon {
  font-size: 1.25rem;
  animation: pulse 2s infinite;
}

/* ==================== Header ==================== */
header, .main-header {
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.98);
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-xl);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
}

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo img {
  height: 45px;
  width: auto;
  transition: transform var(--transition-base);
}

.logo:hover img {
  transform: scale(1.05);
}

/* Navigation */
header nav, .main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
  margin: 0 var(--spacing-xl);
}

header nav ul, .nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

header nav a, .nav-link {
  font-weight: 500;
  color: var(--color-text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
  white-space: nowrap;
}

header nav a:hover,
.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: var(--color-bg-tertiary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 3px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-primary);
  padding: var(--spacing-sm);
  flex-shrink: 0;
}

/* Dropdown Menu */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm);
  margin-top: var(--spacing-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  list-style: none;
  z-index: var(--z-dropdown);
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-primary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.dropdown-menu a:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-primary);
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

/* ==================== Hero Section ==================== */
.hero {
  position: relative;
  padding: var(--spacing-3xl) 0;
  overflow: hidden;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0.1;
  background-image:
    repeating-linear-gradient(45deg, transparent, transparent 35px, rgba(255,255,255,.1) 35px, rgba(255,255,255,.1) 70px);
  animation: backgroundShift 20s linear infinite;
}

.hero-content {
  position: relative;
  text-align: center;
  color: white;
  z-index: 1;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  margin-bottom: var(--spacing-lg);
  animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  opacity: 0.95;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 1s ease-out;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-bottom: var(--spacing-2xl);
  animation: fadeInUp 1.2s ease-out;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-full);
  font-weight: 600;
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: white;
  color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn-secondary {
  background: transparent;
  color: white;
  border-color: white;
}

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

/* Trust Indicators */
.trust-indicators {
  display: flex;
  gap: var(--spacing-xl);
  justify-content: center;
  animation: fadeInUp 1.4s ease-out;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  backdrop-filter: blur(10px);
}

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

/* ==================== Featured Topics ==================== */
.featured-topics {
  padding: var(--spacing-3xl) 0;
  background: var(--color-bg-primary);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  color: var(--color-text-primary);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-full);
}

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

.topic-card {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.topic-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.topic-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.topic-card:hover::before {
  transform: scaleX(1);
}

.topic-icon {
  margin-bottom: var(--spacing-md);
}

.topic-card h3 {
  margin-bottom: var(--spacing-md);
}

.topic-links {
  list-style: none;
  margin-top: var(--spacing-md);
}

.topic-links li {
  padding: var(--spacing-xs) 0;
}

.topic-links a {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.topic-links a:hover {
  color: var(--color-primary);
  padding-left: var(--spacing-sm);
}

/* ==================== Popular Articles ==================== */
.popular-articles {
  padding: var(--spacing-3xl) 0;
  background: var(--color-bg-secondary);
}

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

.article-card {
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  position: relative;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.article-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  font-size: 0.875rem;
}

.article-category {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  color: var(--color-primary);
  font-weight: 600;
}

.reading-time {
  color: var(--color-text-light);
}

.article-card h3 {
  margin-bottom: var(--spacing-md);
  font-size: 1.25rem;
}

.article-card p {
  flex: 1;
  color: var(--color-text-secondary);
}

.read-more {
  display: inline-flex;
  align-items: center;
  color: var(--color-primary);
  font-weight: 600;
  margin-top: var(--spacing-md);
  transition: all var(--transition-fast);
}

.read-more:hover {
  gap: var(--spacing-sm);
}

/* ==================== Educational Value ==================== */
.educational-value {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.value-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.value-text h2 {
  color: white;
  margin-bottom: var(--spacing-lg);
}

.value-text p {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-lg);
}

.value-points {
  list-style: none;
}

.value-points li {
  padding: var(--spacing-sm) 0;
  padding-left: var(--spacing-xl);
  position: relative;
}

.value-points li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #10b981;
  font-weight: bold;
  font-size: 1.25rem;
}

.value-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.stat {
  text-align: center;
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: bold;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.875rem;
  opacity: 0.9;
}

/* ==================== Search Section ==================== */
.search-section {
  padding: var(--spacing-3xl) 0;
  background: var(--color-bg-primary);
}

.search-box {
  display: flex;
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.search-input {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  font-size: 1rem;
  outline: none;
}

.search-button {
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--color-primary);
  color: white;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.search-button:hover {
  background: var(--color-primary-dark);
}

.popular-searches {
  text-align: center;
  color: var(--color-text-light);
}

.search-tag {
  display: inline-block;
  margin: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.search-tag:hover {
  background: var(--color-primary);
  color: white;
}

/* ==================== Footer ==================== */
footer, .main-footer {
  background: var(--color-text-primary);
  color: white;
  padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-lg);
  margin-top: var(--spacing-3xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.footer-section h3, .footer-section h4 {
  color: white;
  margin-bottom: var(--spacing-md);
}

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

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

.footer-section li, .footer-links li {
  padding: var(--spacing-xs) 0;
}

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

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  max-width: 1200px;
  margin: 0 auto;
}

.footer-bottom p, .disclaimer {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: var(--spacing-sm);
}

/* ==================== Animations ==================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    transform: translateY(-100%);
  }
  to {
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

@keyframes backgroundShift {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(70px);
  }
}

/* ==================== Media Queries ==================== */
@media (max-width: 768px) {
  .menu-toggle, .mobile-menu-toggle {
    display: block;
  }

  header nav, .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 400px;
    height: 100vh;
    background: var(--color-bg-primary);
    box-shadow: var(--shadow-xl);
    transition: right var(--transition-base);
    z-index: var(--z-modal);
    margin: 0;
  }

  header nav.active, .main-nav.active {
    right: 0;
  }

  header nav ul, .nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-2xl) var(--spacing-xl);
    gap: var(--spacing-md);
  }

  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    margin-left: var(--spacing-lg);
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .trust-indicators {
    flex-direction: column;
    align-items: center;
  }

  .value-content {
    grid-template-columns: 1fr;
  }

  .value-stats {
    grid-template-columns: 1fr;
  }

  .articles-carousel {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .topics-grid {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }
}

/* ==================== Article Pages ==================== */
.article-page, .page {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-3xl) var(--spacing-lg);
}

article.page {
  max-width: 100%;
}

.article-header {
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 2px solid var(--color-border);
}

.article-title {
  margin-bottom: var(--spacing-lg);
}

.article-metadata {
  display: flex;
  gap: var(--spacing-lg);
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.article-content {
  font-size: 1.125rem;
  line-height: 1.8;
}

.article-content h2 {
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border-light);
}

.article-content h3 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.article-content blockquote {
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-bg-tertiary);
  border-left: 4px solid var(--color-primary);
  font-style: italic;
}

.article-content ul,
.article-content ol {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-xl);
}

.article-content li {
  margin-bottom: var(--spacing-sm);
}

/* ==================== Print Styles ==================== */
@media print {
  .safety-banner,
  .main-header,
  .main-footer,
  .mobile-menu-toggle {
    display: none;
  }

  body {
    font-size: 12pt;
  }

  a {
    text-decoration: underline;
  }
}