/* Dark mode (default) */
:root {
  --primary: #8b5cf6;
  --primary-dark: #7c3aed;
  --primary-light: #a78bfa;
  --bg-dark: #0f0a1a;
  --bg-card: #1a1225;
  --bg-card-hover: #251a35;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --border: #2d2240;
  --success: #22c55e;
  --header-bg: rgba(15, 10, 26, 0.9);
  --hero-gradient: rgba(139, 92, 246, 0.15);
}

/* Light mode colors */
.theme-light {
  --bg-dark: #f8f9fa;
  --bg-card: #ffffff;
  --bg-card-hover: #f5f3ff;
  --text: #1a1a2e;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --header-bg: rgba(248, 249, 250, 0.95);
  --hero-gradient: rgba(139, 92, 246, 0.08);
}

.theme-light .feature-card,
.theme-light .security-item,
.theme-light .faq-item,
.theme-light .benefit-card,
.theme-light .nips-table,
.theme-light .cta-box {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.theme-light .hero-screenshot img {
  box-shadow: 0 25px 50px -12px rgba(139, 92, 246, 0.15);
}

.theme-light .btn-secondary {
  background: var(--bg-card);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.3s, color 0.3s;
}

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary);
  color: white;
  padding: 8px 16px;
  z-index: 1000;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 0;
}

a {
  color: var(--primary-light);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* Focus states for accessibility */
a:focus,
button:focus,
.btn:focus {
  outline: 2px solid var(--primary-light);
  outline-offset: 2px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
header {
  padding: 20px 0;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  z-index: 100;
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.logo img {
  width: 40px;
  height: 40px;
}

nav {
  display: flex;
  gap: 32px;
  align-items: center;
}

nav a {
  color: var(--text-muted);
  font-weight: 500;
}

nav a:hover {
  color: var(--text);
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text);
}

.mobile-menu-toggle img {
  display: block;
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 81px;
  left: 0;
  right: 0;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 24px;
  flex-direction: column;
  gap: 16px;
  z-index: 99;
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.theme-toggle:hover {
  border-color: var(--primary);
  color: var(--text);
}

.theme-toggle img {
  width: 20px;
  height: 20px;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon,
.theme-toggle .icon-system {
  display: none;
}

/* System theme (default) */
[data-theme="system"] .theme-toggle .icon-system {
  display: block;
}

/* Dark theme */
[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

/* Light theme */
[data-theme="light"] .theme-toggle .icon-moon {
  display: block;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mobile-nav.active {
  display: flex;
}

.mobile-nav a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 1.1rem;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.mobile-nav a:last-child {
  border-bottom: none;
}

/* Hero */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  background: radial-gradient(ellipse at top, var(--hero-gradient) 0%, transparent 60%);
  transition: background 0.3s;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text) 0%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 40px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn img {
  width: 20px;
  height: 20px;
}

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


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

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg-card);
  border-color: var(--primary);
}

/* GitHub Badge */
.github-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 24px;
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: all 0.2s;
}

.github-badge:hover {
  border-color: var(--primary);
  color: var(--text);
}

.github-badge img {
  width: 16px;
  height: 16px;
}

.hero-screenshot {
  margin-top: 60px;
  display: flex;
  justify-content: center;
}

.hero-screenshot img {
  max-width: 100%;
  border-radius: 16px;
  box-shadow: 0 25px 50px -12px rgba(139, 92, 246, 0.25);
  border: 1px solid var(--border);
}

/* Platform Badges */
.stats-badges {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
}

.stats-badges a {
  display: inline-flex;
}

.stats-badges a:hover img {
  transform: translateY(-2px);
}

.stats-badges img {
  height: 24px;
  border-radius: 4px;
  transition: transform 0.2s;
}

.platform-badges {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.platform-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.platform-badge img {
  width: 16px;
  height: 16px;
}

/* Why Nostrame - Key Benefits */
.why-nostrame {
  padding: 80px 0;
  border-bottom: 1px solid var(--border);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.benefit-card {
  text-align: center;
  padding: 32px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: all 0.3s;
}

.benefit-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}

.benefit-icon {
  width: 56px;
  height: 56px;
  background: rgba(139, 92, 246, 0.15);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.benefit-icon img {
  width: 28px;
  height: 28px;
}

.benefit-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--text);
}

.benefit-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Compatible Apps */
.compatible-apps {
  padding: 80px 0;
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.03) 0%, transparent 100%);
}

.apps-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}

.app-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-weight: 500;
  transition: all 0.2s;
}

.app-badge:hover {
  border-color: var(--primary);
  background: var(--bg-card-hover);
  color: var(--text);
}


.app-badge img {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  object-fit: contain;
}

/* Screenshot Gallery */
.screenshot-gallery {
  padding: 100px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(139, 92, 246, 0.05) 50%, transparent 100%);
}

.gallery-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  max-width: 1000px;
  margin: 0 auto;
}

.gallery-item {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 300px;
}

.gallery-item img {
  width: 100%;
  height: 420px;
  object-fit: contain;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.3);
  transition: all 0.3s;
  background: var(--bg-card);
}

.gallery-item:hover img {
  transform: translateY(-8px);
  box-shadow: 0 20px 50px -10px rgba(139, 92, 246, 0.3);
  border-color: var(--primary);
}

.gallery-item h3 {
  margin-top: 16px;
  font-size: 1.1rem;
  color: var(--text);
}

.gallery-item p {
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.theme-light .gallery-item img {
  box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.1);
}

.theme-light .gallery-item:hover img {
  box-shadow: 0 20px 50px -10px rgba(139, 92, 246, 0.2);
}

/* Scroll Animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* How It Works */
.how-it-works {
  padding: 100px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(139, 92, 246, 0.03) 100%);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.steps-grid::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 12.5%;
  right: 12.5%;
  height: 2px;
  background: linear-gradient(90deg, var(--border), var(--primary), var(--primary), var(--border));
  z-index: 0;
}

.step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-number {
  width: 80px;
  height: 80px;
  background: var(--bg-card);
  border: 2px solid var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-light);
}

img.step-icon {
  width: 32px;
  height: 32px;
}

.step h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.step p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Features */
.features {
  padding: 100px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.section-title p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  transition: all 0.3s, background-color 0.3s, border-color 0.3s;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(139, 92, 246, 0.2);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon img {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Security */
.security {
  padding: 100px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(139, 92, 246, 0.05) 50%, transparent 100%);
}

.security-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.security-item {
  flex: 0 1 300px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  background: var(--bg-card);
  border-radius: 10px;
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.security-item:hover {
  border-color: var(--success);
}

img.security-check {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.security-item h4 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.security-item p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* NIPs */
.nips {
  padding: 100px 0;
}

.nips-table {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  max-width: 800px;
  margin: 0 auto;
}

.nips-table table {
  width: 100%;
  border-collapse: collapse;
}

.nips-table th,
.nips-table td {
  padding: 16px 24px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.nips-table th {
  background: rgba(139, 92, 246, 0.1);
  font-weight: 600;
  color: var(--primary-light);
}

.nips-table tr:last-child td {
  border-bottom: none;
}

.nips-table tr:hover td {
  background: var(--bg-card-hover);
}

.status-supported {
  color: var(--success);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-supported img {
  width: 16px;
  height: 16px;
}

/* FAQ */
.faq {
  padding: 100px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(139, 92, 246, 0.03) 100%);
}

.faq-grid {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.3s;
}

.faq-item:hover {
  border-color: var(--primary);
}

.faq-question {
  width: 100%;
  padding: 24px;
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 600;
}

.faq-question:hover {
  color: var(--primary-light);
}

.faq-question img {
  width: 20px;
  height: 20px;
  transition: transform 0.3s;
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.active .faq-question img {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

.faq-answer p {
  padding: 24px;
  color: var(--text-muted);
  line-height: 1.7;
}

.faq-answer a {
  color: var(--primary-light);
}

/* CTA */
.cta {
  padding: 100px 0;
  text-align: center;
}

.cta-box {
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(139, 92, 246, 0.1) 100%);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 60px 40px;
  max-width: 700px;
  margin: 0 auto;
}

.cta-box h2 {
  font-size: 2rem;
  margin-bottom: 16px;
}

.cta-box p {
  color: var(--text-muted);
  margin-bottom: 32px;
}

/* Footer */
footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.nostr-follow-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: linear-gradient(135deg, #8b5cf6 0%, #6d28d9 100%);
  color: white;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.nostr-follow-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
  color: white;
}

.nostr-follow-btn img {
  width: 20px;
  height: 20px;
}

.follower-count {
  background: rgba(255, 255, 255, 0.2);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.8rem;
  margin-left: 4px;
}

.follower-count:empty {
  display: none;
}

.footer-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.zap-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: linear-gradient(135deg, #f7931a 0%, #ff6b00 100%);
  color: white;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.zap-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(247, 147, 26, 0.4);
  color: white;
}

.zap-btn img {
  width: 20px;
  height: 20px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-muted);
}

.footer-link-icon {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-link-icon img {
  width: 16px;
  height: 16px;
}

.footer-copyright {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .hero p {
    font-size: 1.1rem;
  }

  nav {
    display: none;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .section-title h2 {
    font-size: 2rem;
  }

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

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .benefits-grid {
    grid-template-columns: 1fr 1fr;
  }

  .steps-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .steps-grid::before {
    display: none;
  }

  .step-number {
    width: 60px;
    height: 60px;
    font-size: 1.25rem;
  }

  img.step-icon {
    width: 24px;
    height: 24px;
  }

  .nips-table th,
  .nips-table td {
    padding: 12px 16px;
    font-size: 0.9rem;
  }
}

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

  .benefits-grid {
    grid-template-columns: 1fr;
  }
}