/* ========================================
   OK Check-in Landing Page
   A warm, trustworthy aesthetic
   ======================================== */

:root {
  /* Warm amber palette */
  --amber-50: #fffbeb;
  --amber-100: #fef3c7;
  --amber-200: #fde68a;
  --amber-300: #fcd34d;
  --amber-400: #fbbf24;
  --amber-500: #f59e0b;
  --amber-600: #d97706;
  
  /* Neutral dark */
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --slate-950: #020617;
  
  /* Semantic */
  --bg-primary: #0c0a09;
  --bg-secondary: #1c1917;
  --bg-card: #292524;
  --text-primary: #fafaf9;
  --text-secondary: #a8a29e;
  --text-muted: #78716c;
  --accent: var(--amber-400);
  --accent-hover: var(--amber-300);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* Typography */
  --font-sans: 'DM Sans', system-ui, sans-serif;
  --font-serif: 'Fraunces', Georgia, serif;
  
  /* Borders */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Grain overlay */
.grain {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1000;
  opacity: 0.03;
  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");
}

/* Typography */
h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.25rem;
  font-family: var(--font-sans);
  font-weight: 600;
}

p {
  color: var(--text-secondary);
}

a {
  color: inherit;
  text-decoration: none;
}

/* Layout */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-lg) var(--space-xl);
  background: linear-gradient(to bottom, var(--bg-primary), transparent);
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
}

.logo-icon {
  background: var(--accent);
  color: var(--bg-primary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 700;
}

.logo-text {
  font-size: 1.125rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  transition: color 0.2s;
}

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

.btn-nav {
  background: var(--bg-card);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  color: var(--text-primary) !important;
}

.btn-nav:hover {
  background: var(--slate-700);
}

/* Main content */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

section {
  padding: var(--space-4xl) 0;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--space-3xl);
  padding-top: calc(var(--space-4xl) + 60px);
}

.hero-content {
  animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.badge {
  display: inline-block;
  background: rgba(251, 191, 36, 0.1);
  color: var(--accent);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--space-lg);
  border: 1px solid rgba(251, 191, 36, 0.2);
}

.hero h1 {
  margin-bottom: var(--space-lg);
}

.hero-subtitle {
  font-size: 1.125rem;
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  max-width: 480px;
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-full);
  font-weight: 500;
  font-size: 1rem;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

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

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

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--slate-700);
}

.btn-secondary:hover {
  background: var(--bg-card);
  border-color: var(--slate-600);
}

/* Hero Visual */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.phone-mockup {
  width: 280px;
  background: var(--bg-secondary);
  border-radius: 40px;
  padding: 12px;
  border: 1px solid var(--slate-700);
  box-shadow: 
    0 0 0 1px rgba(255,255,255,0.05) inset,
    0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.phone-screen {
  background: var(--bg-card);
  border-radius: 32px;
  padding: var(--space-xl);
  min-height: 500px;
  display: flex;
  flex-direction: column;
}

.app-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-2xl);
}

.app-greeting {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

.app-button-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
}

.app-check-btn {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--amber-400), var(--amber-500));
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg-primary);
  transition: all 0.2s;
  box-shadow: 
    0 0 0 8px rgba(251, 191, 36, 0.1),
    0 10px 40px rgba(251, 191, 36, 0.3);
}

.app-check-btn:hover {
  transform: scale(1.05);
  box-shadow: 
    0 0 0 12px rgba(251, 191, 36, 0.15),
    0 15px 50px rgba(251, 191, 36, 0.4);
}

.app-check-btn.pressed {
  transform: scale(0.95);
}

.app-tap-text {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.app-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  margin-top: auto;
}

.status-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  flex: 1;
}

.status-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.status-value {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

.status-divider {
  width: 1px;
  height: 32px;
  background: var(--slate-700);
}

/* Floating cards */
.floating-card {
  position: absolute;
  background: var(--bg-card);
  border: 1px solid var(--slate-700);
  border-radius: var(--radius-lg);
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
  box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

.card-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
}

.card-icon.safe {
  background: rgba(34, 197, 94, 0.2);
  color: #22c55e;
}

.card-icon.notify {
  background: rgba(59, 130, 246, 0.2);
  color: #3b82f6;
}

.card-1 {
  top: 20%;
  right: -20px;
  animation: float 6s ease-in-out infinite;
}

.card-2 {
  bottom: 25%;
  left: -20px;
  animation: float 6s ease-in-out infinite 1s;
}

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

/* How it Works */
.how-it-works {
  background: var(--bg-secondary);
  border-radius: var(--radius-2xl);
  padding: var(--space-4xl);
  margin: var(--space-2xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-tag {
  display: inline-block;
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2xl);
}

.step {
  text-align: center;
}

.step-number {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 400;
  color: var(--accent);
  opacity: 0.5;
  margin-bottom: var(--space-md);
}

.step-content h3 {
  margin-bottom: var(--space-sm);
}

.step-content p {
  font-size: 0.9375rem;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--slate-800);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  transition: all 0.3s;
}

.feature-card:hover {
  border-color: var(--slate-700);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(251, 191, 36, 0.1);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: var(--space-lg);
}

.feature-card h3 {
  margin-bottom: var(--space-sm);
}

.feature-card p {
  font-size: 0.9375rem;
}

/* Testimonial */
.testimonial {
  text-align: center;
  padding: var(--space-4xl) var(--space-xl);
}

.testimonial blockquote {
  max-width: 700px;
  margin: 0 auto;
}

.testimonial p {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: var(--space-lg);
}

.testimonial cite {
  color: var(--text-muted);
  font-style: normal;
  font-size: 0.9375rem;
}

/* Download Section */
.download {
  background: linear-gradient(135deg, var(--amber-600) 0%, var(--amber-500) 100%);
  border-radius: var(--radius-2xl);
  padding: var(--space-4xl);
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.download-content h2 {
  color: var(--bg-primary);
  margin-bottom: var(--space-md);
}

.download-content > p {
  color: rgba(0,0,0,0.7);
  max-width: 500px;
  margin: 0 auto var(--space-xl);
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
}

.store-btn {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-lg);
  transition: all 0.2s;
}

.store-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.store-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.store-label {
  font-size: 0.6875rem;
  opacity: 0.7;
}

.store-name {
  font-size: 1.125rem;
  font-weight: 600;
}

.download-note {
  font-size: 0.875rem;
  color: rgba(0,0,0,0.5);
}

/* Footer */
footer {
  padding: var(--space-2xl) var(--space-xl);
  border-top: 1px solid var(--slate-800);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
}

.footer-links {
  display: flex;
  gap: var(--space-xl);
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
  transition: color 0.2s;
}

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

.footer-copy {
  width: 100%;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--slate-800);
}

/* Responsive */
@media (max-width: 968px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-2xl);
  }
  
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-visual {
    order: -1;
  }
  
  .floating-card {
    display: none;
  }
  
  .steps {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  header {
    padding: var(--space-md);
  }
  
  .nav-links a:not(.btn-nav) {
    display: none;
  }
  
  main {
    padding: 0 var(--space-md);
  }
  
  section {
    padding: var(--space-2xl) 0;
  }
  
  .how-it-works {
    padding: var(--space-2xl) var(--space-lg);
    border-radius: var(--radius-xl);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .download {
    padding: var(--space-2xl) var(--space-lg);
    border-radius: var(--radius-xl);
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: var(--space-md);
  }
}