/**
 * Modern CSS Enhancements (2025)
 * 
 * Advanced CSS features and modern design patterns:
 * - CSS Container Queries
 * - Fluid typography with clamp()
 * - Scroll-triggered animations
 * - Modern gradients and glassmorphism
 * - Improved accessibility
 * - View Transitions API support
 */

/* ==========================================
   CSS CUSTOM PROPERTIES - MODERN ADDITIONS
   ========================================== */
:root {
  /* Fluid Typography Scale */
  --fluid-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --fluid-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --fluid-base: clamp(1rem, 0.925rem + 0.375vw, 1.125rem);
  --fluid-lg: clamp(1.125rem, 1rem + 0.625vw, 1.5rem);
  --fluid-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.75rem);
  --fluid-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 2.25rem);
  --fluid-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 3rem);
  --fluid-4xl: clamp(2.25rem, 1.75rem + 2.5vw, 3.75rem);
  --fluid-5xl: clamp(3rem, 2.25rem + 3.75vw, 5rem);
  
  /* Fluid Spacing Scale */
  --space-fluid-xs: clamp(0.25rem, 0.2rem + 0.25vw, 0.5rem);
  --space-fluid-sm: clamp(0.5rem, 0.4rem + 0.5vw, 0.75rem);
  --space-fluid-md: clamp(1rem, 0.9rem + 0.5vw, 1.5rem);
  --space-fluid-lg: clamp(1.5rem, 1.25rem + 1.25vw, 2.5rem);
  --space-fluid-xl: clamp(2rem, 1.5rem + 2.5vw, 4rem);
  --space-fluid-2xl: clamp(3rem, 2.25rem + 3.75vw, 6rem);
  
  /* Modern Animation Timing */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-in-out-quad: cubic-bezier(0.45, 0, 0.55, 1);
  --spring: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-blur: blur(12px);
  
  /* Modern Shadows */
  --shadow-colored: 0 4px 14px 0 rgba(0, 0, 0, 0.1);
  --shadow-elevated: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner-glow: inset 0 0 20px rgba(255, 255, 255, 0.1);
  
  /* Gradient Colors - Using fallback colors for robustness */
  --gradient-primary: linear-gradient(135deg, var(--privacy-primary, #6366f1) 0%, var(--ai-primary, #06b6d4) 100%);
  --gradient-privacy: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  --gradient-ai: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
  --gradient-security: linear-gradient(135deg, #1f2937 0%, #374151 100%);
  --gradient-tech: linear-gradient(160deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  --gradient-trust: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

/* ==========================================
   SKIP LINK - ACCESSIBILITY
   ========================================== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--brand-primary);
  color: var(--text-inverse);
  border-radius: var(--radius-md);
  font-weight: var(--font-semibold);
  z-index: calc(var(--z-tooltip) + 10);
  transition: top 0.3s var(--ease-out-expo);
}

.skip-link:focus {
  top: var(--spacing-md);
  outline: 2px solid var(--text-inverse);
  outline-offset: 2px;
}

/* ==========================================
   SETTINGS CONTROLS - MODERN STYLE
   ========================================== */
.settings-controls {
  position: fixed;
  top: var(--space-fluid-md);
  right: var(--space-fluid-md);
  display: flex;
  gap: var(--spacing-sm);
  z-index: var(--z-fixed);
}

.toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.75rem;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s var(--ease-out-expo);
  box-shadow: var(--shadow-sm);
}

.toggle-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.toggle-btn:active {
  transform: translateY(0);
}

.toggle-btn__icon {
  font-size: 1rem;
  line-height: 1;
}

.toggle-btn__label {
  font-weight: var(--font-medium);
}

@media (max-width: 480px) {
  .toggle-btn__label {
    display: none;
  }
  
  .settings-controls {
    top: var(--spacing-sm);
    right: var(--spacing-sm);
  }
}

/* ==========================================
   MODERN HERO SECTION
   ========================================== */
.hero-modern {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh; /* Dynamic viewport height for mobile */
  padding: var(--space-fluid-2xl) var(--space-fluid-md);
  text-align: center;
  overflow: hidden;
  color: var(--text-inverse);
}

.hero-modern__background {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-modern__gradient {
  position: absolute;
  inset: 0;
  background: var(--gradient-privacy);
}

.hero-modern__pattern {
  position: absolute;
  inset: 0;
  opacity: 0.3;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 50px 50px;
}

.hero-modern__particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-modern__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero-modern__icon-wrapper {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: clamp(80px, 15vw, 120px);
  height: clamp(80px, 15vw, 120px);
  margin-bottom: var(--space-fluid-lg);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
  animation: float 6s ease-in-out infinite;
}

@keyframes morph {
  0%, 100% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; }
  25% { border-radius: 58% 42% 75% 25% / 76% 46% 54% 24%; }
  50% { border-radius: 50% 50% 33% 67% / 55% 27% 73% 45%; }
  75% { border-radius: 33% 67% 58% 42% / 63% 68% 32% 37%; }
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-10px) rotate(2deg); }
}

.hero-modern__icon {
  font-size: clamp(2.5rem, 8vw, 4rem);
  line-height: 1;
}

.hero-modern__title {
  font-size: var(--fluid-5xl);
  font-weight: var(--font-bold);
  line-height: 1.1;
  margin-bottom: var(--space-fluid-md);
  background: linear-gradient(135deg, #fff 0%, rgba(255, 255, 255, 0.8) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-modern__subtitle {
  font-size: var(--fluid-lg);
  line-height: 1.6;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto var(--space-fluid-lg);
}

.hero-modern__badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--space-fluid-lg);
}

.hero-modern__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: var(--fluid-sm);
  font-weight: var(--font-medium);
}

.hero-modern__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--space-fluid-md);
}

/* Theme Variants */
.hero-modern[data-theme="privacy"] .hero-modern__gradient {
  background: var(--gradient-privacy);
}

.hero-modern[data-theme="ai"] .hero-modern__gradient {
  background: var(--gradient-ai);
}

.hero-modern[data-theme="security"] .hero-modern__gradient {
  background: var(--gradient-security);
}

.hero-modern[data-theme="tech"] .hero-modern__gradient {
  background: var(--gradient-tech);
}

.hero-modern[data-theme="trust"] .hero-modern__gradient {
  background: var(--gradient-trust);
}

/* ==========================================
   SCROLL INDICATOR
   ========================================== */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-fluid-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  opacity: 0.7;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

.scroll-indicator__mouse {
  width: 24px;
  height: 40px;
  border: 2px solid currentColor;
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}

.scroll-indicator__wheel {
  width: 4px;
  height: 8px;
  background: currentColor;
  border-radius: 2px;
  animation: scroll 1.5s ease-in-out infinite;
}

@keyframes scroll {
  0% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(10px); }
}

.scroll-indicator__text {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

@media (max-height: 700px) {
  .scroll-indicator {
    display: none;
  }
}

/* ==========================================
   MODERN BUTTONS
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--fluid-base);
  font-weight: var(--font-semibold);
  text-decoration: none;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all 0.3s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.3s;
}

.btn:hover::before {
  opacity: 1;
}

.btn--primary {
  background: var(--text-inverse);
  color: var(--neutral-900);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  color: var(--neutral-900);
  text-decoration: none;
}

.btn--outline {
  background: transparent;
  border: 2px solid currentColor;
  color: var(--text-inverse);
}

.btn--outline:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
  text-decoration: none;
}

.btn--lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--fluid-lg);
}

.btn__arrow {
  transition: transform 0.3s var(--ease-out-expo);
}

.btn:hover .btn__arrow {
  transform: translateX(4px);
}

/* ==========================================
   MODERN SECTIONS
   ========================================== */
.section {
  padding: var(--space-fluid-2xl) var(--space-fluid-md);
}

.section--features {
  background-color: var(--bg-secondary);
}

.section--trust {
  background-color: var(--bg-primary);
  padding: var(--space-fluid-lg) var(--space-fluid-md);
}

.section--cta {
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-fluid-xl);
}

.section__title {
  font-size: var(--fluid-3xl);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-fluid-sm);
  color: var(--text-primary);
}

.section__subtitle {
  font-size: var(--fluid-lg);
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ==========================================
   TRUST BADGES
   ========================================== */
.trust-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
}

.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-full);
  font-size: var(--fluid-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  transition: all 0.3s var(--ease-out-expo);
}

.trust-badge:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-secondary);
  transform: translateY(-2px);
}

.trust-badge__icon {
  font-size: 1.25rem;
}

/* ==========================================
   CTA CARD
   ========================================== */
.cta-card {
  text-align: center;
  padding: var(--space-fluid-xl);
  background: linear-gradient(135deg, var(--privacy-primary, #6366f1) 0%, var(--ai-primary, #06b6d4) 100%);
  border-radius: var(--radius-2xl);
  color: var(--text-inverse);
  position: relative;
  overflow: hidden;
}

.cta-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.cta-card__title {
  font-size: var(--fluid-2xl);
  font-weight: var(--font-bold);
  margin-bottom: var(--spacing-md);
  position: relative;
}

.cta-card__text {
  font-size: var(--fluid-lg);
  opacity: 0.9;
  margin-bottom: var(--space-fluid-md);
  position: relative;
}

.cta-card__actions {
  position: relative;
}

/* ==========================================
   MODERN FOOTER
   ========================================== */
.footer-modern {
  background: var(--neutral-900);
  color: var(--neutral-300);
  padding: var(--space-fluid-xl) var(--space-fluid-md) var(--space-fluid-md);
}

.footer-modern__grid {
  display: grid;
  grid-template-columns: 1.5fr 2fr;
  gap: var(--space-fluid-xl);
  margin-bottom: var(--space-fluid-lg);
}

@media (max-width: 768px) {
  .footer-modern__grid {
    grid-template-columns: 1fr;
    gap: var(--space-fluid-lg);
  }
}

.footer-modern__brand {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.footer-modern__logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--fluid-xl);
  font-weight: var(--font-bold);
  color: var(--text-inverse);
}

.footer-modern__logo-icon {
  font-size: 1.5em;
}

.footer-modern__tagline {
  color: var(--neutral-400);
  max-width: 300px;
  line-height: 1.6;
}

.footer-modern__nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-fluid-md);
}

.footer-modern__section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-modern__title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-inverse);
  margin-bottom: var(--spacing-sm);
}

.footer-modern__links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer-modern__links a {
  color: var(--neutral-400);
  font-size: var(--text-sm);
  transition: color 0.2s var(--ease-out-expo);
}

.footer-modern__links a:hover {
  color: var(--text-inverse);
  text-decoration: none;
}

.footer-modern__trust {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-lg);
  padding: var(--space-fluid-md) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: var(--space-fluid-md);
}

.trust-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--text-sm);
  color: var(--trust-primary);
}

.footer-modern__copyright {
  text-align: center;
  font-size: var(--text-sm);
  color: var(--neutral-500);
}

.footer-modern__credit {
  margin-top: var(--spacing-sm);
}

.footer-modern__credit a {
  color: var(--neutral-400);
}

.footer-modern__credit a:hover {
  color: var(--text-inverse);
}

/* ==========================================
   SCROLL ANIMATIONS
   ========================================== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered animation for children */
.animate-on-scroll.is-visible .feature-card:nth-child(1) { transition-delay: 0.1s; }
.animate-on-scroll.is-visible .feature-card:nth-child(2) { transition-delay: 0.2s; }
.animate-on-scroll.is-visible .feature-card:nth-child(3) { transition-delay: 0.3s; }

/* ==========================================
   REDUCED MOTION SUPPORT
   ========================================== */
@media (prefers-reduced-motion: reduce) {
  .hero-modern__icon-wrapper {
    animation: none;
  }
  
  .scroll-indicator {
    animation: none;
  }
  
  .scroll-indicator__wheel {
    animation: none;
  }
  
  .animate-on-scroll {
    opacity: 1;
    transform: none;
    transition: none;
  }
  
  .btn,
  .feature-card,
  .trust-badge,
  .toggle-btn,
  .tool-card,
  .feature-pill {
    transition: none;
  }
  
  /* Disable all keyframe animations */
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==========================================
   DARK MODE ADJUSTMENTS
   ========================================== */
html.dark-mode .toggle-btn,
html.dark .toggle-btn,
html[data-theme="dark"] .toggle-btn {
  background: rgba(0, 0, 0, 0.3);
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--text-inverse);
}

html.dark-mode .section--features,
html.dark .section--features,
html[data-theme="dark"] .section--features {
  background-color: var(--neutral-800);
}

html.dark-mode .trust-badge,
html.dark .trust-badge,
html[data-theme="dark"] .trust-badge {
  background: var(--neutral-800);
  border-color: var(--neutral-700);
}

html.dark-mode .footer-modern,
html.dark .footer-modern,
html[data-theme="dark"] .footer-modern {
  background: var(--neutral-950, #0a0a0a);
}

/* ==========================================
   PRINT STYLES
   ========================================== */
@media print {
  .settings-controls,
  .scroll-indicator,
  .hero-modern__background {
    display: none !important;
  }
  
  .hero-modern {
    min-height: auto;
    padding: 2rem;
    color: #000;
  }
  
  .hero-modern__title {
    -webkit-text-fill-color: initial;
    background: none;
  }
}