/* ============================================
   VCFCard — Premium Design System
   Modern, calm, atmospheric, trust-driven
   ============================================ */

:root {
  /* Color Palette */
  --bg-primary: #0a0e14;
  --bg-secondary: #111820;
  --bg-tertiary: #1a1f2e;
  --bg-hover: #22293b;

  --text-primary: #f5f5f5;
  --text-secondary: #a8aab3;
  --text-tertiary: #7a7e8a;

  --accent-primary: #4f9cff;
  --accent-secondary: #60d5ff;
  --accent-subtle: #2d3e5f;

  --border-color: #252d3d;
  --border-subtle: #1a2132;

  /* Spacing */
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
  --font-family-display: "Söhne", -apple-system, BlinkMacSystemFont, sans-serif;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(79, 156, 255, 0.1);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   GLOBAL STYLES
   ============================================ */

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

html, body {
  width: 100%;
  height: 100%;
}

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;

  /* Subtle animated background */
  background: linear-gradient(
    135deg,
    var(--bg-primary) 0%,
    var(--bg-secondary) 50%,
    var(--bg-primary) 100%
  );
  background-attachment: fixed;
  position: relative;
  overflow-x: hidden;
}

/* Atmospheric overlay */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(
      ellipse at 20% 50%,
      rgba(79, 156, 255, 0.05) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 80% 80%,
      rgba(96, 213, 255, 0.03) 0%,
      transparent 50%
    );
  pointer-events: none;
  z-index: -1;
}

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

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

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: var(--space-md) var(--space-lg);

  display: flex;
  justify-content: space-between;
  align-items: center;

  /* Premium Glassmorphism Effect */
  background: rgba(10, 14, 20, 0.35);
  backdrop-filter: blur(25px) saturate(200%) brightness(1.1);
  -webkit-backdrop-filter: blur(25px) saturate(200%) brightness(1.1);

  /* Refined Border - Subtle Frosted Edge */
  border-bottom: 1px solid;
  border-image: linear-gradient(
    90deg,
    rgba(79, 156, 255, 0.05) 0%,
    rgba(79, 156, 255, 0.15) 50%,
    rgba(79, 156, 255, 0.05) 100%
  ) 1;

  /* Layered Shadow for Depth */
  box-shadow:
    0 4px 6px rgba(0, 0, 0, 0.07),
    0 10px 20px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);

  transition: all var(--transition-base);
}

header:hover {
  background: rgba(10, 14, 20, 0.4);
  border-bottom-color: rgba(79, 156, 255, 0.2);
  box-shadow:
    0 6px 12px rgba(0, 0, 0, 0.1),
    0 15px 30px rgba(0, 0, 0, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

nav {
  display: flex;
  gap: var(--space-lg);
}

nav a {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.3px;
  color: var(--text-secondary);
  padding: var(--space-sm) var(--space-md);
  border-radius: 8px;
  transition: all var(--transition-fast);
  position: relative;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

nav a:hover {
  color: var(--accent-secondary);
  background: rgba(79, 156, 255, 0.12);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

nav a::before {
  content: '';
  position: absolute;
  bottom: 4px;
  left: var(--space-md);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transition: width var(--transition-base);
}

nav a:hover::before {
  width: calc(100% - var(--space-md) * 2);
}

/* Language Selector */
.lang {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.lang button {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-tertiary);
  padding: var(--space-sm) var(--space-md);
  border-radius: 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all var(--transition-fast);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.lang button:hover {
  background: rgba(79, 156, 255, 0.15);
  border-color: rgba(79, 156, 255, 0.3);
  color: var(--accent-secondary);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
}

.lang button:active {
  background: rgba(79, 156, 255, 0.2);
  transform: scale(0.98);
}

/* ============================================
   MAIN CONTENT
   ============================================ */

main {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg);
  min-height: calc(100vh - 200px);
  animation: fadeIn var(--transition-slow);
}

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

/* ============================================
   HEADINGS
   ============================================ */

h1 {
  font-size: 48px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: var(--space-lg);

  background: linear-gradient(
    135deg,
    var(--text-primary) 0%,
    var(--accent-secondary) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;

  letter-spacing: -0.5px;
  animation: slideDown var(--transition-slow);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin: var(--space-2xl) 0 var(--space-lg) 0;
  line-height: 1.2;
  letter-spacing: -0.3px;
}

h2:first-child {
  margin-top: 0;
}

h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--space-sm) 0; /* Adjusted for cards */
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin: 0 0 var(--space-md) 0;
}

.intro-text, .policy-intro, .support-intro {
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
  padding: var(--space-lg);
  border-radius: 12px;
  background: rgba(79, 156, 255, 0.05);
  border-left: 3px solid var(--accent-primary);
}

/* ============================================
   HOME: HERO SECTION
   ============================================ */

.hero-section {
  text-align: center;
  padding: var(--space-2xl) 0;
  max-width: 700px;
  margin: 0 auto var(--space-3xl);
}

.hero-subtitle {
  font-size: 22px;
  line-height: 1.5;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

/* ============================================
   HOME: FEATURES GRID
   ============================================ */

.features-section {
  margin-bottom: var(--space-3xl);
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-xl);
  font-size: 28px;
  color: var(--text-primary);
}

.features-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-lg);
}

.feature-item {
  padding: var(--space-xl);
  background: var(--bg-secondary);
  border-radius: 16px;
  border: 1px solid var(--border-color);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-secondary);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.feature-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.feature-item:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.feature-item:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  font-size: 24px;
  margin-bottom: var(--space-lg);
  background: rgba(79, 156, 255, 0.1);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  color: var(--accent-primary);
}

/* ============================================
   MARKETING & CTA
   ============================================ */

.marketing-section {
  padding: var(--space-2xl);
  background: var(--bg-secondary);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  margin-bottom: var(--space-xl);
  transition: all var(--transition-base);
}

.marketing-section:hover {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
  box-shadow: var(--shadow-glow);
}

.marketing-cta {
  margin-top: var(--space-3xl);
  padding: var(--space-3xl) var(--space-xl);
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border-radius: 24px;
  border: 1px solid var(--border-color);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.marketing-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
}

.marketing-cta h2 {
  font-size: 36px;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.marketing-cta p {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-button {
  display: inline-block;
  padding: var(--space-md) var(--space-xl);
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  color: var(--bg-primary);
  font-weight: 700;
  font-size: 16px;
  border-radius: 50px;
  box-shadow: var(--shadow-glow);
  transition: all var(--transition-base);
  text-decoration: none;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(79, 156, 255, 0.4);
  color: var(--bg-primary);
}

.cta-button:active {
  transform: translateY(0);
}

/* ============================================
   SUPPORT & POLICY
   ============================================ */

.policy-container,
.support-container {
  animation: fadeIn var(--transition-slow);
}

.policy-section,
.faq-section,
.tips-section,
.contact-section {
  padding: var(--space-2xl);
  background: var(--bg-secondary);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
  margin-bottom: var(--space-xl);
}

.faq-item {
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-lg) 0;
  list-style: none;
  transition: all var(--transition-base);
}

.faq-question {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  padding: var(--space-md);
  margin: 0 calc(-1 * var(--space-md));
  border-radius: 8px;
  transition: all var(--transition-fast);
  user-select: none;
  display: flex;
  align-items: center;
}

.faq-answer {
  padding: var(--space-lg) var(--space-md) 0;
  color: var(--text-secondary);
  animation: slideDown var(--transition-base);
}

.tips-list {
  list-style: none;
  padding: 0;
  margin: var(--space-lg) 0 0 0;
}

.tips-list li {
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-md);
  background: var(--bg-hover);
  border-left: 3px solid var(--accent-secondary);
  border-radius: 8px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.tips-list li:hover {
  background: rgba(79, 156, 255, 0.1);
  border-left-color: var(--accent-primary);
  transform: translateX(4px);
}

.tips-list li::before {
  content: '✓ ';
  color: var(--accent-secondary);
  font-weight: 700;
  margin-right: var(--space-sm);
}

/* ============================================
   FOOTER
   ============================================ */

footer {
  margin-top: var(--space-3xl);
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  color: var(--text-tertiary);
  font-size: 14px;
  border-top: 1px solid var(--border-color);
  background: rgba(0, 0, 0, 0.2);
}

footer a {
  color: var(--accent-primary);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 640px) {
  header {
    flex-direction: column;
    gap: var(--space-lg);
    padding: var(--space-lg);
  }

  nav {
    flex-wrap: wrap;
    gap: var(--space-md);
    justify-content: center;
  }

  h1 {
    font-size: 32px;
  }

  h2 {
    font-size: 24px;
  }

  main {
    padding: var(--space-2xl) var(--space-lg);
  }

  .hero-section {
    padding: var(--space-xl) 0;
  }

  .hero-subtitle {
    font-size: 18px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Dark mode default */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0a0e14;
    --bg-secondary: #111820;
  }
}