:root, [data-theme="dark"] {
  --bg-main: #0c0d12;
  --bg-card: rgba(25, 27, 36, 0.7);
  --bg-card-hover: rgba(33, 36, 48, 0.85);
  --border-card: rgba(255, 255, 255, 0.08);
  --border-card-hover: rgba(120, 150, 255, 0.3);
  --accent-primary: #3a82f6;
  --accent-glow: #60a5fa;
  --accent-gradient: linear-gradient(135deg, #60a5fa 0%, #a855f7 100%);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --badge-bg: rgba(59, 130, 246, 0.12);
  --badge-border: rgba(96, 165, 250, 0.25);
  --badge-text: #93c5fd;
  --nav-bg: rgba(12, 13, 18, 0.75);
  --nav-border: rgba(255, 255, 255, 0.06);
  --shadow-subtle: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 50px -10px rgba(96, 165, 250, 0.25);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --max-w: 1080px;
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --bg-main: #f8fafc;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --border-card: rgba(0, 0, 0, 0.08);
  --border-card-hover: rgba(59, 130, 246, 0.4);
  --accent-primary: #2563eb;
  --accent-glow: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --badge-bg: rgba(37, 99, 235, 0.08);
  --badge-border: rgba(37, 99, 235, 0.2);
  --badge-text: #1d4ed8;
  --nav-bg: rgba(248, 250, 252, 0.85);
  --nav-border: rgba(0, 0, 0, 0.06);
  --shadow-subtle: 0 10px 30px -10px rgba(0, 0, 0, 0.07);
  --shadow-glow: 0 15px 40px -10px rgba(59, 130, 246, 0.15);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg-main: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-hover: rgba(255, 255, 255, 0.98);
    --border-card: rgba(0, 0, 0, 0.08);
    --border-card-hover: rgba(59, 130, 246, 0.4);
    --accent-primary: #2563eb;
    --accent-glow: #3b82f6;
    --accent-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --badge-bg: rgba(37, 99, 235, 0.08);
    --badge-border: rgba(37, 99, 235, 0.2);
    --badge-text: #1d4ed8;
    --nav-bg: rgba(248, 250, 252, 0.85);
    --nav-border: rgba(0, 0, 0, 0.06);
    --shadow-subtle: 0 10px 30px -10px rgba(0, 0, 0, 0.07);
    --shadow-glow: 0 15px 40px -10px rgba(59, 130, 246, 0.15);
  }
}

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  min-width: 38px;
  min-height: 38px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  padding: 0;
  outline: none;
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-card-hover);
  transform: scale(1.05);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  stroke: var(--text-primary);
  fill: none;
  transition: transform var(--transition-smooth);
}

/* Hide/show sun/moon depending on active theme */
[data-theme="dark"] .icon-sun {
  display: block;
}
[data-theme="dark"] .icon-moon {
  display: none;
}

[data-theme="light"] .icon-sun {
  display: none;
}
[data-theme="light"] .icon-moon {
  display: block;
}

/* Default before explicit toggle (auto system mode) */
:root:not([data-theme]) .icon-sun {
  display: block;
}
:root:not([data-theme]) .icon-moon {
  display: none;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .icon-sun {
    display: none;
  }
  :root:not([data-theme]) .icon-moon {
    display: block;
  }
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-main);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(96, 165, 250, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 85% 20%, rgba(168, 85, 247, 0.08) 0%, transparent 40%);
  background-attachment: fixed;
}

/* Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background-color: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  transition: all var(--transition-fast);
}

.nav-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.nav-brand img {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--text-primary);
  color: var(--bg-main) !important;
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
}

.nav-cta:hover {
  transform: translateY(-1px);
  opacity: 0.92;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
}

/* Hero Section */
.hero {
  padding: 5rem 1.5rem 4rem;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background-color: var(--badge-bg);
  border: 1px solid var(--badge-border);
  color: var(--badge-text);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  margin-bottom: 1.5rem;
}

.badge-dot {
  width: 7px;
  height: 7px;
  background-color: #22c55e;
  border-radius: 50%;
  box-shadow: 0 0 10px #22c55e;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

.cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.nav-app-store-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  background: #000000;
  color: #ffffff !important;
  border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 0.32rem 0.85rem;
  border-radius: 9px;
  text-decoration: none !important;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  height: 36px;
  box-sizing: border-box;
  flex-shrink: 0;
}

.nav-app-store-btn:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.45);
  background: #111111;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.45);
}

.nav-app-store-btn img,
.nav-app-store-btn .nav-apple-logo {
  width: 14px !important;
  height: 16px !important;
  max-width: 14px !important;
  max-height: 16px !important;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
}

.nav-app-store-btn svg {
  display: none !important;
}

.nav-app-store-btn .nav-btn-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  text-align: left;
  line-height: 1.1;
}

.nav-app-store-btn .nav-btn-sub {
  font-size: 0.48rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #a1a1a6;
  line-height: 1;
}

.nav-app-store-btn .nav-btn-main {
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #ffffff;
  line-height: 1.1;
}

.app-store-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  background: #000000;
  color: #ffffff !important;
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 0.65rem 1.6rem;
  border-radius: 13px;
  text-decoration: none !important;
  font-family: inherit;
  transition: all var(--transition-smooth);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  box-sizing: border-box;
}

.app-store-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.6);
  border-color: rgba(255, 255, 255, 0.5);
  background: #0d0d0d;
}

.app-store-btn img,
.app-store-btn .app-store-apple-logo {
  width: 24px !important;
  height: 28px !important;
  max-width: 24px !important;
  max-height: 28px !important;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
}

.app-store-btn svg {
  display: none !important;
}

.app-store-btn-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  text-align: left;
  line-height: 1.1;
}

.app-store-btn-text .download-sub {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 600;
  color: #a1a1a6;
  line-height: 1;
}

.app-store-btn-text .download-main {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  color: #ffffff;
  line-height: 1.12;
}

.secondary-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  color: var(--text-primary);
  padding: 0.95rem 1.75rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.secondary-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-card-hover);
  transform: translateY(-2px);
}

/* App Mockup Preview */
.mockup-container {
  position: relative;
  max-width: 760px;
  margin: 0 auto 5rem;
  border-radius: var(--radius-lg);
  padding: 1rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.01) 100%);
  border: 1px solid var(--border-card);
  box-shadow: var(--shadow-glow);
}

.chat-preview-window {
  background: var(--bg-card);
  border-radius: calc(var(--radius-lg) - 4px);
  padding: 1.75rem;
  text-align: left;
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
}

.window-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-card);
  margin-bottom: 1.5rem;
}

.window-dots {
  display: flex;
  gap: 6px;
}

.window-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.window-status {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.chat-bubble-user {
  margin-left: auto;
  max-width: 80%;
  background: var(--accent-gradient);
  color: #fff;
  padding: 0.85rem 1.25rem;
  border-radius: 18px 18px 4px 18px;
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 1.25rem;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

.chat-bubble-ai {
  margin-right: auto;
  max-width: 85%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-card);
  color: var(--text-primary);
  padding: 1rem 1.25rem;
  border-radius: 18px 18px 18px 4px;
  font-size: 0.95rem;
  line-height: 1.55;
  margin-bottom: 1rem;
}

.chat-bubble-ai strong {
  color: #60a5fa;
}

.ai-telemetry-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* Features Section */
.features-section {
  max-width: var(--max-w);
  margin: 0 auto 6rem;
  padding: 0 1.5rem;
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 3.5rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: all var(--transition-smooth);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

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

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--accent-glow);
}

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

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 0.6rem;
}

.feature-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.55;
}

/* Document & Policy Page Layout */
.doc-page {
  max-width: 820px;
  margin: 2rem auto 5rem;
  padding: 0 1.5rem;
}

.doc-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-card);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.doc-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.doc-meta-item strong {
  color: var(--text-secondary);
}

.doc-content {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.doc-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 2.25rem 0 1rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.doc-content h2:first-of-type {
  margin-top: 0;
}

.doc-content p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.doc-content ul {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

.doc-content li {
  margin-bottom: 0.6rem;
  line-height: 1.6;
}

.doc-content strong {
  color: var(--text-primary);
}

.highlight-box {
  background: rgba(59, 130, 246, 0.08);
  border-left: 4px solid var(--accent-primary);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5rem 0;
}

.highlight-box p {
  color: var(--text-primary);
  margin-bottom: 0;
  font-weight: 500;
}

/* Footer */
footer {
  margin-top: auto;
  border-top: 1px solid var(--nav-border);
  background: var(--nav-bg);
  padding: 3rem 1.5rem 2.5rem;
}

.footer-container {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  list-style: none;
}

.footer-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-card);
  padding-top: 1.5rem;
}

.footer-bottom a {
  color: var(--text-muted);
  text-decoration: none;
}

.footer-bottom a:hover {
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.3rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .doc-content {
    padding: 1.5rem;
  }
  .nav-links {
    gap: 0.75rem;
  }
  .footer-top, .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .nav-container {
    padding: 0.75rem 1rem;
  }
  .nav-links .nav-link {
    display: none;
  }
  .hero-title {
    font-size: 2rem;
  }
  .app-store-btn {
    padding: 0.6rem 1.3rem;
  }
  .app-store-btn .download-main {
    font-size: 1.15rem;
  }
}