/* Modern Dewey's World Styles */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+Thai:wght@300;400;500;600;700&display=swap');

/* CSS Variables for consistent theming */
:root {
  --primary-color: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --secondary-color: #f59e0b;
  --accent-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --success-color: #10b981;
  
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  
  --border-color: #e5e7eb;
  --border-light: #f3f4f6;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
}

/* Dark theme variables */
[data-theme="dark"] {
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  
  --bg-primary: #111827;
  --bg-secondary: #1f2937;
  --bg-tertiary: #374151;
  
  --border-color: #374151;
  --border-light: #4b5563;
}

/* Base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Inter', 'Noto Sans Thai', sans-serif;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  transition: var(--transition-normal);
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

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

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

/* Alert System */
.alert-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(4px);
}

.alert-container {
  max-width: 500px;
  width: 90%;
  margin: 0 auto;
}

.alert-content {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-xl);
  position: relative;
  animation: slideIn 0.3s ease;
}

.alert-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.alert-message {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.alert-close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--border-radius-sm);
  transition: var(--transition-fast);
}

.alert-close-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Cookie Notice */
.cookie-notice {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  right: 2rem;
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: 1000;
  animation: slideUp 0.5s ease;
}

.cookie-content {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
}

.cookie-icon {
  font-size: 2rem;
  color: var(--secondary-color);
}

.cookie-text {
  flex: 1;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.cookie-link {
  color: var(--primary-color);
  text-decoration: underline;
}

.cookie-accept-btn {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.cookie-accept-btn:hover {
  background: var(--primary-dark);
}

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  top: 100px;
  right: 2rem;
  z-index: 1000;
}

.theme-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1.25rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-btn:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

/* Navigation */
.navbar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  padding: 1rem 0;
  transition: var(--transition-normal);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  color: var(--text-primary) !important;
  text-decoration: none;
}

.navbar-brand .logo {
  height: 40px;
  width: auto;
}

.brand-text {
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.navbar-nav .nav-link {
  font-weight: 500;
  color: var(--text-secondary) !important;
  padding: 0.5rem 1rem !important;
  border-radius: var(--border-radius-md);
  transition: var(--transition-fast);
  margin: 0 0.25rem;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: white !important;
  transform: translateY(-2px);
}

.navbar-nav .nav-link i {
  margin-right: 0.5rem;
}

.navbar-toggler {
  border: none;
  padding: 0.25rem;
}

.navbar-toggler:focus {
  box-shadow: none;
}

/* Auth Section */
.navbar-auth {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.auth-btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--border-radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
}

.loading-btn {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
}

.login-btn {
  background: var(--success-color);
  color: white;
}

.login-btn:hover {
  background: #059669;
  transform: translateY(-2px);
}

.logout-btn {
  background: var(--danger-color);
  color: white;
}

.logout-btn:hover {
  background: #dc2626;
  transform: translateY(-2px);
}

.loading-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top: 2px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.user-menu {
  display: flex;
  flex-direction: column;
  align-items: end;
  gap: 0.5rem;
}

.user-info {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.welcome-text {
  font-weight: 400;
}

.user-name {
  font-weight: 600;
  color: var(--primary-color);
}

/* User Dropdown Styles */
.user-dropdown {
  position: relative;
  display: flex;
  align-items: center;
}

.user-avatar-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: var(--transition-fast);
  position: relative;
  -webkit-tap-highlight-color: transparent; /* Remove iOS tap highlight */
  touch-action: manipulation; /* Prevent double-tap zoom */
  pointer-events: auto;
  z-index: 1;
}

.user-avatar-container:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.user-avatar-container:active {
  transform: scale(0.98);
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--primary-color);
}

.user-dropdown .user-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  opacity: 1;
  visibility: visible;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  min-width: 180px;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: var(--border-radius-md);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s ease-in-out;
  z-index: 1050;
  margin-top: 0.5rem;
  max-height: 80vh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

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

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

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: var(--transition-fast);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
  pointer-events: auto;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  position: relative;
  z-index: 1;
}

.dropdown-item:hover {
  background-color: #f3f4f6;
  color: var(--primary-color);
}

.dropdown-item i {
  width: 16px;
  text-align: center;
}

.dropdown-divider {
  border-top: 1px solid #e5e7eb;
  margin: 0.5rem 0;
}

.logout-item:hover {
  background-color: #fef2f2;
  color: var(--danger-color);
}

/* Hero Section */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, #667eea 0%, #4ba257 100%);
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-gradient {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, 
    rgba(99, 102, 241, 0.9) 0%, 
    rgba(85, 155, 247, 0.8) 50%, 
    rgba(72, 236, 124, 0.9) 100%);
}

.hero-particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.3) 0%, transparent 50%);
  animation: float 20s ease-in-out infinite;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: white;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.gradient-text {
  background: linear-gradient(135deg, #caffca, #c7f6ff, #dcefff);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tagline {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 1.5rem;
  font-weight: 500;
  text-align: center;
}

.brand-tagline strong {
  color: white;
  font-weight: 600;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2.5rem;
  opacity: 0.95;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  color: white!important;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.cta-btn {
  padding: 0.875rem 2rem;
  border-radius: var(--border-radius-lg);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.125rem;
}

.cta-btn.primary {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.cta-btn.primary:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

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

.cta-btn.secondary:hover {
  background: var(--bg-tertiary);
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

.scroll-arrow {
  color: white;
  font-size: 1.5rem;
  animation: bounce 2s infinite;
  opacity: 0.8;
}

/* About/Purpose Section */
.about-section {
  padding: 6rem 0;
  background: var(--bg-secondary);
  position: relative;
}

.about-content {
  padding-right: 2rem;
}

.about-description {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.section-divider {
  width: 60px;
  height: 4px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
  margin-bottom: 2rem;
}

.data-usage-section {
  background: var(--bg-primary);
  border: 2px solid var(--primary-color);
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  margin: 2rem 0;
}

.data-usage-section h4 {
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 1rem;
  font-size: 1.25rem;
}

.data-usage-text {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.privacy-link {
  display: inline-flex;
  align-items: center;
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
  padding: 0.75rem 1rem;
  background: rgba(99, 102, 241, 0.1);
  border-radius: var(--border-radius-md);
  transition: var(--transition-fast);
}

.privacy-link:hover {
  background: rgba(99, 102, 241, 0.2);
  color: var(--primary-dark);
  transform: translateX(5px);
}

.privacy-link i {
  margin-right: 0.5rem;
}

.purpose-highlights {
  margin-top: 3rem;
}

.purpose-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
}

.purpose-item:hover {
  transform: translateX(10px);
  box-shadow: var(--shadow-md);
}

.purpose-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 1.5rem;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: white;
  font-size: 1.5rem;
}

.purpose-text h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.purpose-text p {
  color: var(--text-secondary);
  margin: 0;
  font-size: 0.95rem;
}

.about-visual {
  padding-left: 2rem;
}

.feature-showcase {
  position: relative;
  background: var(--bg-primary);
  border-radius: var(--border-radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
}

.showcase-item {
  display: flex;
  align-items: center;
  padding: 1.5rem;
  margin-bottom: 1rem;
  border-radius: var(--border-radius-lg);
  transition: var(--transition-normal);
  cursor: pointer;
  border: 2px solid transparent;
}

.showcase-item:last-child {
  margin-bottom: 0;
}

.showcase-item.active {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: white;
  transform: scale(1.02);
}

.showcase-item:hover:not(.active) {
  background: var(--bg-tertiary);
  border-color: var(--primary-light);
}

.showcase-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 1rem;
  font-size: 1.25rem;
  background: rgba(255, 255, 255, 0.1);
  flex-shrink: 0;
}

.showcase-item:not(.active) .showcase-icon {
  background: var(--primary-color);
  color: white;
}

.showcase-item h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.showcase-item p {
  font-size: 0.9rem;
  margin: 0;
  opacity: 0.9;
}

.value-proposition {
  margin-top: 5rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-color);
}

.value-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.value-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.value-card {
  text-align: center;
  padding: 2rem 1.5rem;
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  height: 100%;
  border: 1px solid var(--border-light);
}

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

.value-icon {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  background: linear-gradient(135deg, var(--accent-color), #059669);
  color: white;
  font-size: 1.75rem;
}

.value-card h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.value-card p {
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.6;
}

/* Services Section */
.services-section {
  padding: 6rem 0;
  background: var(--bg-primary);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.service-card {
  background: var(--bg-primary);
  border-radius: var(--border-radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
  height: 100%;
  border: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.service-icon {
  width: 80px;
  height: 80px;
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: white;
}

.service-icon.cloud {
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
}

.service-icon.qr {
  background: linear-gradient(135deg, #8b5cf6, #7c3aed);
}

.service-icon.credits {
  background: linear-gradient(135deg, #f59e0b, #d97706);
}

.service-icon.donate {
  background: linear-gradient(135deg, #ef4444, #dc2626);
}

.service-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.service-description {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.service-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.feature-tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.feature-tag i {
  color: var(--success-color);
  font-size: 0.75rem;
}

.service-btn {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius-md);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

.service-btn:hover {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
  transform: translateX(4px);
  color: white;
}

/* Certificates Section */
.certificates-section {
  padding: 6rem 0;
  background: var(--bg-secondary);
}

.certificate-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.certificate-frame {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  padding: 1rem;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.certificate-iframe {
  width: 100%;
  height: 300px;
  border: none;
  border-radius: var(--border-radius-md);
}

.certificate-info h3 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.certificate-info p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-size: 1.125rem;
}

.info-btn {
  background: var(--primary-color);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius-md);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

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

/* Contact Section */
.contact-section {
  padding: 6rem 0;
  background: var(--bg-primary);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.contact-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
}

.contact-details h4 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.contact-details p,
.contact-details a {
  color: var(--text-secondary);
  margin: 0;
}

.contact-details a:hover {
  color: var(--primary-color);
}

.feedback-section {
  background: var(--bg-tertiary);
  padding: 2rem;
  border-radius: var(--border-radius-lg);
  text-align: center;
}

.feedback-section h3 {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.feedback-section p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.feedback-btn {
  background: linear-gradient(135deg, var(--secondary-color), #d97706);
  color: white;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 auto;
  transition: var(--transition-fast);
}

.feedback-btn:hover {
  background: linear-gradient(135deg, #d97706, #b45309);
  transform: translateY(-2px);
}

.ad-container {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
}

.ad-frame {
  width: 100%;
  max-width: 320px;
  height: 100px;
  border: none;
  border-radius: var(--border-radius-md);
  background: var(--bg-tertiary);
}

/* Footer */
.footer {
  background: var(--text-primary);
  color: white;
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-brand img {
  width: 60px;
  height: auto;
}

.footer-brand h4 {
  color: white;
  margin: 0;
}

.footer-brand p {
  color: #d1d5db;
  margin: 0;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer-column h5 {
  color: white;
  margin-bottom: 1rem;
  font-size: 1.125rem;
}

.footer-column ul {
  list-style: none;
  padding: 0;
}

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

.footer-column a {
  color: #d1d5db;
  text-decoration: none;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-column a:hover {
  color: var(--primary-light);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid #374151;
}

.footer-copyright p {
  color: #9ca3af;
  margin: 0;
}

.data-notice {
  margin-top: 1rem;
  padding: 0.75rem;
  background: rgba(99, 102, 241, 0.1);
  border-radius: var(--border-radius-md);
  border-left: 4px solid var(--primary-color);
}

.data-notice small {
  color: var(--text-secondary);
  line-height: 1.4;
  display: block;
}

.data-notice i {
  color: var(--primary-color);
  margin-right: 0.5rem;
}

.footer-menu {
  display: flex;
  gap: 1rem;
}

.menu-btn,
.back-btn {
  background: var(--bg-tertiary);
  color: white;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--border-radius-md);
  text-decoration: none;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

.menu-btn:hover,
.back-btn:hover {
  background: var(--primary-color);
  color: white;
}

/* Scroll to Top Button */
.scroll-top-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.25rem;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: var(--transition-normal);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  z-index: 1000;
}

.scroll-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top-btn:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* Animations */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Responsive Design */
@media (max-width: 1200px) {
  .hero-title {
    font-size: 3rem;
  }
  
  .certificate-container,
  .contact-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 992px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.125rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .services-section,
  .certificates-section,
  .contact-section {
    padding: 4rem 0;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .cta-btn {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .service-card {
    padding: 1.5rem;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
  }
  
  /* User Dropdown Mobile Styles */
  .user-dropdown .user-name {
    display: block;
    max-width: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.75rem;
  }
  
  .user-avatar-container {
    padding: 0.5rem;
    min-height: 44px; /* iOS touch target minimum */
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    pointer-events: auto;
    position: relative;
    z-index: 10;
  }
  
  .user-avatar {
    width: 30px;
    height: 30px;
    pointer-events: none;
  }
  
  .user-dropdown .user-name {
    pointer-events: none;
  }
  
  /* Improve dropdown positioning on mobile */
  .dropdown-menu {
    right: 0;
    min-width: 160px;
    margin-top: 0.75rem;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  }
  
  .dropdown-item {
    padding: 0.625rem 0.875rem;
    font-size: 0.8125rem;
  }
  
  /* Prevent scroll on dropdown interaction */
  .user-dropdown.show {
    position: relative;
    z-index: 1001;
  }
  
  /* About Section Mobile Styles */
  .about-section {
    padding: 4rem 0;
  }
  
  .about-content {
    padding-right: 0;
    margin-bottom: 3rem;
  }
  
  .about-visual {
    padding-left: 0;
  }
  
  .purpose-item {
    flex-direction: column;
    text-align: center;
    padding: 1.5rem 1rem;
  }
  
  .purpose-icon {
    margin-right: 0;
    margin-bottom: 1rem;
  }
  
  .showcase-item {
    flex-direction: column;
    text-align: center;
    padding: 1rem;
  }
  
  .showcase-icon {
    margin-right: 0;
    margin-bottom: 0.75rem;
  }
  
  .value-proposition {
    margin-top: 3rem;
  }
  
  .value-title {
    font-size: 1.75rem;
  }
  
  .value-card {
    padding: 1.5rem 1rem;
  }
  
  /* Data Usage Section Mobile */
  .data-usage-section {
    padding: 1.5rem;
  }
  
  .privacy-link {
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
  }
  
  .brand-tagline {
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  .navbar-auth {
    gap: 0.5rem;
  }
  
  .auth-btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
  }
  
  .user-avatar {
    width: 28px;
    height: 28px;
  }
  
  .user-avatar-container {
    padding: 0.375rem;
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 1rem;
  }
  
  .hero-section {
    padding: 0 1rem;
  }
  
  .service-features {
    flex-direction: column;
  }
  
  .footer-bottom {
    gap: 1rem;
    text-align: center;
  }
  
  .cookie-content {
    flex-direction: column;
    text-align: center;
  }
  
  .theme-toggle {
    top: 80px;
    right: 1rem;
  }
  .navbar-brand .brand-text {
    display: none;
  }
  
  .auth-btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.8rem;
  }
  
  .cookie-notice {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
  }
}

/* Print styles */
@media print {
  .navbar,
  .theme-toggle,
  .cookie-notice,
  .alert-overlay,
  .scroll-top-btn {
    display: none !important;
  }
  
  .hero-section {
    min-height: auto;
    padding: 2rem 0;
  }
  
  body {
    background: white;
    color: black;
  }
}