/**
 * VPN Manager Landing Page Styles
 * 
 * Structure:
 * 1. Base & Reset
 * 2. Scrollbar
 * 3. Animated Backgrounds
 * 4. Gradient Text
 * 5. Glass Morphism
 * 6. Gradient Border Cards
 * 7. Glow Effects
 * 8. Buttons
 * 9. Icon Animations
 * 10. Scroll Reveal
 * 11. Installation Tabs
 * 12. FAQ Accordion
 * 13. Theme Toggle
 * 14. Code Blocks
 * 15. Screenshot Showcase
 * 16. Feature Cards Grid
 * 17. Reduced Motion
 * 18. Noise Overlay
 * 19. Floating CTA
 * 20. Typing Cursor
 * 21. Comparison Table
 * 22. Header Scroll Effect
 * 23. How It Works Connector
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* ===== 1. BASE & RESET ===== */
html {
  scroll-behavior: smooth;
}

*:focus-visible {
  outline: 2px solid #3584e4;
  outline-offset: 2px;
}

/* ===== 2. SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

.dark ::-webkit-scrollbar-track {
  background: #1e293b;
}

::-webkit-scrollbar-track {
  background: #f1f5f9;
}

.dark ::-webkit-scrollbar-thumb {
  background: #475569;
  border-radius: 5px;
  border: 2px solid #1e293b;
}

::-webkit-scrollbar-thumb {
  background: #94a3b8;
  border-radius: 5px;
  border: 2px solid #f1f5f9;
}

::-webkit-scrollbar-thumb:hover {
  background: #64748b;
}

/* ===== 3. ANIMATED BACKGROUNDS ===== */

/* Mesh Gradient Blobs */
.mesh-gradient {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 0;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.6;
  mix-blend-mode: screen;
}

.dark .blob {
  opacity: 0.4;
  mix-blend-mode: screen;
}

.blob-1 {
  width: 600px;
  height: 600px;
  background: linear-gradient(135deg, #3584e4 0%, #1c71d8 100%);
  top: -200px;
  left: -100px;
  animation: blob 7s infinite;
}

.blob-2 {
  width: 500px;
  height: 500px;
  background: linear-gradient(135deg, #62a0ea 0%, #3584e4 100%);
  top: 50%;
  right: -150px;
  animation: blob 7s infinite 2s;
}

.blob-3 {
  width: 400px;
  height: 400px;
  background: linear-gradient(135deg, #1c71d8 0%, #0d47a1 100%);
  bottom: -100px;
  left: 30%;
  animation: blob 10s infinite 4s;
}

/* Grid overlay with glow */
.grid-overlay {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(53, 132, 228, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(53, 132, 228, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  animation: gridPulse 4s ease-in-out infinite;
}

.dark .grid-overlay {
  background-image: 
    linear-gradient(rgba(53, 132, 228, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(53, 132, 228, 0.05) 1px, transparent 1px);
}

/* Traveling glow effect on grid */
.grid-glow {
  position: absolute;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(53, 132, 228, 0.3) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

/* Floating security icons */
.floating-icons {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.floating-icon {
  position: absolute;
  opacity: 0.05;
  animation: securityFloat 20s linear infinite;
}

.dark .floating-icon {
  opacity: 0.03;
}

.floating-icon:nth-child(1) { left: 10%; animation-delay: 0s; animation-duration: 25s; }
.floating-icon:nth-child(2) { left: 25%; animation-delay: 5s; animation-duration: 20s; }
.floating-icon:nth-child(3) { left: 40%; animation-delay: 10s; animation-duration: 30s; }
.floating-icon:nth-child(4) { left: 55%; animation-delay: 3s; animation-duration: 22s; }
.floating-icon:nth-child(5) { left: 70%; animation-delay: 8s; animation-duration: 28s; }
.floating-icon:nth-child(6) { left: 85%; animation-delay: 12s; animation-duration: 24s; }

/* ===== 4. GRADIENT TEXT ===== */
.gradient-text {
  background: linear-gradient(135deg, #3584e4 0%, #1c71d8 50%, #62a0ea 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 8s ease-in-out infinite;
}

/* ===== 5. GLASS MORPHISM ===== */
.glass {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.dark .glass {
  background: rgba(30, 41, 59, 0.8);
}

.glass-card {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(203, 213, 225, 0.5);
}

.dark .glass-card {
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid rgba(71, 85, 105, 0.5);
}

/* ===== 6. GRADIENT BORDER CARDS ===== */
.gradient-border {
  position: relative;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(203, 213, 225, 0.5);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.dark .gradient-border {
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid rgba(71, 85, 105, 0.5);
}

.gradient-border::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: linear-gradient(135deg, #3584e4, #1c71d8, #62a0ea, #3584e4);
  background-size: 300% 300%;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.4s ease;
  animation: gradientShift 4s ease-in-out infinite;
}

.gradient-border:hover::before {
  opacity: 1;
}

.gradient-border:hover {
  border-color: transparent;
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(53, 132, 228, 0.2);
}

.dark .gradient-border:hover {
  box-shadow: 0 20px 40px rgba(53, 132, 228, 0.15);
}

/* ===== 7. GLOW EFFECTS ===== */
.glow-hover {
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.glow-hover:hover {
  box-shadow: 
    0 0 20px rgba(53, 132, 228, 0.3),
    0 0 40px rgba(53, 132, 228, 0.2),
    0 0 60px rgba(53, 132, 228, 0.1);
}

/* ===== 8. BUTTONS ===== */
.btn-primary {
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transform: translateX(-100%);
  transition: transform 0.5s ease;
}

.btn-primary:hover::before {
  transform: translateX(100%);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 15px 30px rgba(53, 132, 228, 0.4);
}

.btn-primary:active {
  transform: translateY(-1px) scale(1);
}

.btn-secondary {
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-secondary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.dark .btn-secondary:hover {
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

/* ===== 9. ICON ANIMATIONS ===== */
.icon-bounce:hover svg {
  animation: bounceSubtle 0.6s ease-in-out;
}

.icon-rotate:hover svg {
  transform: rotate(15deg);
  transition: transform 0.3s ease;
}

.icon-scale:hover svg {
  transform: scale(1.2);
  transition: transform 0.3s ease;
}

/* ===== 10. SCROLL REVEAL ===== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Staggered children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0.1s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.2s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.3s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.4s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.5s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.6s; opacity: 1; transform: translateY(0); }

/* ===== 11. INSTALLATION TABS ===== */
.tab-panel {
  display: none;
}

#tab-apt:checked ~ #panel-apt,
#tab-ubuntu:checked ~ #panel-ubuntu,
#tab-fedora:checked ~ #panel-fedora,
#tab-arch:checked ~ #panel-arch,
#tab-source:checked ~ #panel-source {
  display: block;
  animation: fadeIn 0.4s ease-out;
}

/* Active tab styles */
#tab-apt:checked ~ div label[for="tab-apt"],
#tab-ubuntu:checked ~ div label[for="tab-ubuntu"],
#tab-fedora:checked ~ div label[for="tab-fedora"],
#tab-arch:checked ~ div label[for="tab-arch"],
#tab-source:checked ~ div label[for="tab-source"] {
  background-color: #3584e4;
  color: white;
  transform: scale(1.05);
}

/* ===== 12. FAQ ACCORDION ===== */
details summary::-webkit-details-marker {
  display: none;
}

details summary::marker {
  display: none;
  content: '';
}

details[open] > summary {
  border-bottom: 1px solid rgba(203, 213, 225, 0.3);
}

.dark details[open] > summary {
  border-bottom: 1px solid rgba(71, 85, 105, 0.3);
}

details[open] > div {
  animation: faqSlideDown 0.3s ease-out;
}

@keyframes faqSlideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 13. THEME TOGGLE ===== */
.theme-toggle {
  position: relative;
  width: 56px;
  height: 28px;
  border-radius: 14px;
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  cursor: pointer;
  transition: all 0.4s ease;
  overflow: hidden;
}

.dark .theme-toggle {
  background: linear-gradient(135deg, #1e293b, #334155);
}

.theme-toggle-circle {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: white;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.dark .theme-toggle-circle {
  transform: translateX(28px);
  background: #0f172a;
}

.theme-toggle-icon {
  width: 14px;
  height: 14px;
  transition: all 0.4s ease;
}

.sun-icon {
  color: #f59e0b;
}

.dark .sun-icon {
  opacity: 0;
  transform: rotate(180deg) scale(0);
}

.moon-icon {
  position: absolute;
  color: #fbbf24;
  opacity: 0;
  transform: rotate(-180deg) scale(0);
}

.dark .moon-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* ===== 13. CODE BLOCKS ===== */
.code-block {
  position: relative;
  overflow: hidden;
}

.code-block::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(53, 132, 228, 0.1), transparent);
  animation: shimmer 3s infinite;
}

/* ===== 14. SCREENSHOT SHOWCASE ===== */
.screenshot-container {
  position: relative;
  transform-style: preserve-3d;
  perspective: 1000px;
}

.screenshot-container:hover .screenshot-image {
  transform: rotateY(-2deg) rotateX(2deg) scale(1.02);
}

/* Screenshot carousel tabs */
.screenshot-tab {
  background: rgba(255, 255, 255, 0.6);
  color: #64748b;
  border: 1px solid rgba(203, 213, 225, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.dark .screenshot-tab {
  background: rgba(30, 41, 59, 0.6);
  color: #94a3b8;
  border: 1px solid rgba(71, 85, 105, 0.5);
}

.screenshot-tab:hover {
  background: rgba(53, 132, 228, 0.1);
  color: #3584e4;
  border-color: rgba(53, 132, 228, 0.3);
}

.screenshot-tab.active {
  background: linear-gradient(135deg, #3584e4 0%, #1c71d8 100%);
  color: white;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(53, 132, 228, 0.4);
  transform: scale(1.05);
}

.dark .screenshot-tab.active {
  box-shadow: 0 4px 12px rgba(53, 132, 228, 0.3);
}

/* Screenshot images */
.screenshot-img {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease-in-out, visibility 0.5s ease-in-out;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: auto;
}

.screenshot-img.active {
  opacity: 1;
  visibility: visible;
  position: relative;
}

/* Ensure container has height from the active image */
.screenshot-image {
  position: relative;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Progress indicator for auto-rotation */
.screenshot-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, #3584e4, #62a0ea);
  border-radius: 0 0 0 1rem;
  transition: width 0.1s linear;
}

/* Pause on hover indicator */
.screenshot-container:hover .screenshot-progress {
  opacity: 0.5;
}

/* ===== 15. FEATURE CARDS GRID ===== */
.feature-cards-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 1rem;
}

@media (min-width: 768px) {
  .feature-cards-grid {
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: 1fr;
  }
  
  .feature-cards-grid > .feature-column {
    display: grid;
    grid-template-rows: auto 1fr;
    gap: 1.5rem;
  }
  
  .feature-cards-grid .cards-container {
    display: grid;
    grid-auto-rows: minmax(140px, auto);
    gap: 1rem;
    align-content: start;
  }
}

/* ===== 16. REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .reveal, .reveal-left, .reveal-right, .reveal-scale {
    opacity: 1;
    transform: none;
  }
  
  .stagger-children > * {
    opacity: 1;
    transform: none;
  }
}

/* ===== 17. NOISE OVERLAY ===== */
.noise-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.02;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ===== 18. FLOATING CTA ===== */
#floating-cta.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

#floating-cta a {
  animation: pulse-ring 2s ease-out infinite;
}

@keyframes pulse-ring {
  0% {
    box-shadow: 0 0 0 0 rgba(53, 132, 228, 0.4), 0 10px 25px rgba(53, 132, 228, 0.4);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(53, 132, 228, 0), 0 10px 25px rgba(53, 132, 228, 0.4);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(53, 132, 228, 0), 0 10px 25px rgba(53, 132, 228, 0.4);
  }
}

/* ===== 19. TYPING CURSOR ===== */
#typing-cursor {
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ===== 20. COMPARISON TABLE ===== */
#comparison table {
  background: rgba(255, 255, 255, 0.6);
  border-radius: 1rem;
  overflow: hidden;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(203, 213, 225, 0.5);
}

.dark #comparison table {
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid rgba(71, 85, 105, 0.5);
}

#comparison th:first-child,
#comparison td:first-child {
  text-align: left;
}

#comparison tr:last-child td {
  border-bottom: none;
}

/* ===== 21. HEADER SCROLL EFFECT ===== */
header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.dark header.scrolled {
  background: rgba(15, 23, 42, 0.95);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

/* ===== 22. HOW IT WORKS CONNECTOR ANIMATION ===== */
#how-it-works .stagger-children.visible [aria-hidden="true"] {
  animation: connectorGrow 0.5s ease-out forwards;
  animation-delay: 0.3s;
  transform-origin: left;
  transform: scaleX(0);
}

@keyframes connectorGrow {
  to {
    transform: scaleX(1);
  }
}