/* Zulu Aviation - Modern Dark Aviation Website */

/* === VARIABLES === */
:root {
  --black: #000000;
  --dark: #0A0F0D;
  --gray-900: #111413;
  --gray-800: #1A1F1D;
  --gray-700: #2D3230;
  --gray-600: #4A4F4D;
  --gray-500: #6B706E;
  --gray-400: #9B9F9D;
  --gray-300: #C5C8C7;
  --gray-200: #E5E7E6;
  --gray-100: #F5F6F5;
  --white: #FFFFFF;
  
  --accent: #00D9A6;
  --accent-hover: #00F0B8;
  --accent-dark: #00B88D;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
  
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: 
    radial-gradient(circle at 20% 20%, rgba(0,217,166,0.03), transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(0,217,166,0.02), transparent 50%),
    var(--black);
  color: var(--gray-100);
  line-height: 1.6;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

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

button {
  font-family: inherit;
  border: none;
  cursor: pointer;
}

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

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
}

/* === NAVIGATION === */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  transition: transform var(--transition);
}

.logo:hover {
  transform: translateY(-2px);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
  gap: 2px;
}

.logo-title {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.15em;
  font-family: var(--font-mono);
  color: var(--white);
}

.logo-subtitle {
  font-size: 9px;
  color: var(--gray-500);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 600;
}

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

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-300);
  transition: color var(--transition);
  position: relative;
}

.nav-links a:not(.btn-primary):hover {
  color: var(--white);
}

.nav-links a:not(.btn-primary)::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}

.nav-links a:not(.btn-primary):hover::after {
  transform: scaleX(1);
}

@media (max-width: 768px) {
  .nav-links {
    gap: 16px;
  }
  .nav-links a:not(.btn-primary) {
    display: none;
  }
}

/* === BUTTONS === */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  transition: all var(--transition);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0,217,166,0.3);
}

.btn-secondary {
  background: rgba(255,255,255,0.05);
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.1);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.2);
}

.btn-large {
  padding: 16px 32px;
  font-size: 16px;
}

.btn-block {
  width: 100%;
}

/* === HERO === */
.hero {
  padding: 80px 0 120px;
  background: 
    radial-gradient(800px 600px at 20% 30%, rgba(0,217,166,0.08), transparent),
    radial-gradient(600px 500px at 80% 70%, rgba(0,217,166,0.05), transparent);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.hero-content {
  max-width: 580px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(0,217,166,0.1);
  border: 1px solid rgba(0,217,166,0.2);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero h1 {
  font-size: 64px;
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  color: var(--white);
}

.hero-subtitle {
  font-size: 20px;
  color: var(--gray-300);
  line-height: 1.6;
  margin-bottom: 32px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.08);
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: 24px;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--accent);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 12px;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-app {
  position: relative;
}

.hero-screens {
  position: relative;
  height: 600px;
}

.screen-stack {
  position: relative;
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  height: 600px;
}

.screen {
  position: absolute;
  width: 280px;
  border-radius: 32px;
  box-shadow: 
    0 0 0 8px var(--gray-900),
    0 0 0 9px rgba(255,255,255,0.1),
    0 20px 60px rgba(0,0,0,0.6);
  transition: transform 0.3s ease;
}

.screen-1 {
  top: 0;
  left: 50%;
  transform: translateX(-50%) rotate(-3deg);
  z-index: 3;
}

.screen-2 {
  top: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  opacity: 0.7;
}

.screen-3 {
  top: 80px;
  left: 50%;
  transform: translateX(-50%) rotate(3deg);
  z-index: 1;
  opacity: 0.4;
}

.screen-stack:hover .screen-1 {
  transform: translateX(-50%) rotate(0deg) translateY(-10px);
}

.screen-stack:hover .screen-2 {
  transform: translateX(-50%) translateY(-5px);
  opacity: 0.85;
}

.screen-stack:hover .screen-3 {
  transform: translateX(-50%) rotate(0deg);
  opacity: 0.6;
}

@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 60px;
  }
  
  .hero h1 {
    font-size: 42px;
  }
  
  .hero-cta {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 40px 0 60px;
  }
  
  .hero h1 {
    font-size: 36px;
  }
  
  .hero-subtitle {
    font-size: 18px;
  }
  
  .hero-stats {
    grid-template-columns: 1fr;
  }
}

/* === SECTIONS === */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 64px;
}

.section-header h2 {
  font-size: 42px;
  font-weight: 900;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-header p {
  font-size: 18px;
  color: var(--gray-300);
}

/* === FEATURES === */
.features {
  padding: 120px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 32px;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

.feature-card:hover {
  background: rgba(255,255,255,0.04);
  border-color: rgba(0,217,166,0.2);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  font-size: 36px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--gray-400);
  line-height: 1.6;
}

@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .features {
    padding: 60px 0;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
}

/* =========================================
   Screenshots Section
========================================= */

.screenshots {
  padding: 120px 0;
  background: var(--gray-900);
}

.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.screenshot {
  text-align: center;
  transition: transform 0.4s ease;
}

.screenshot:hover {
  transform: translateY(-8px);
}

.screenshot img {
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 28px;

  /* iPhone-style frame effect */
  box-shadow:
    0 0 0 6px var(--gray-900),
    0 0 0 7px rgba(255,255,255,0.06),
    0 30px 70px rgba(0,0,0,0.7);
}

.screenshot-caption {
  margin-top: 18px;
}

.screenshot-caption h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.screenshot-caption p {
  font-size: 14px;
  color: var(--gray-400);
  line-height: 1.5;
}

/* =========================================
   Tablet
========================================= */

@media (max-width: 1024px) {
  .screenshots-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* =========================================
   Mobile
========================================= */

@media (max-width: 640px) {

  .screenshots {
    padding: 80px 0;
  }

  .screenshots-grid {
    display: flex;
    flex-direction: column;
    gap: 48px;
  }

  .screenshot {
    transform: none;
  }

  .screenshot:hover {
    transform: none;
  }

  .screenshot img {
    width: 100%;
    max-width: 100%;
    border-radius: 32px;

    box-shadow:
      0 0 0 6px var(--gray-900),
      0 0 0 7px rgba(255,255,255,0.05),
      0 20px 60px rgba(0,0,0,0.7);
  }

  .screenshot-caption {
    text-align: center;
    padding: 0 10px;
  }

}

/* === PRICING === */
.pricing {
  padding: 120px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  padding: 40px;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: var(--radius-xl);
  position: relative;
}

.pricing-featured {
  background: linear-gradient(135deg, rgba(0,217,166,0.1), rgba(0,217,166,0.05));
  border-color: rgba(0,217,166,0.3);
  transform: scale(1.05);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 16px;
  background: var(--accent);
  color: var(--black);
  font-size: 12px;
  font-weight: 700;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-tag {
  font-size: 14px;
  font-weight: 700;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.pricing-price {
  font-size: 56px;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--white);
  line-height: 1;
}

.pricing-period {
  font-size: 16px;
  color: var(--gray-400);
  margin-bottom: 32px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
  min-height: 280px;
}

.pricing-features li {
  padding: 12px 0;
  font-size: 15px;
  color: var(--gray-300);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-note {
  text-align: center;
  font-size: 13px;
  color: var(--gray-400);
  margin-top: 12px;
}

@media (max-width: 768px) {
  .pricing {
    padding: 60px 0;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-featured {
    transform: none;
  }
}

/* === CTA SECTION === */
.cta-section {
  padding: 120px 0;
}

.cta-card {
  max-width: 700px;
  margin: 0 auto;
  padding: 80px 40px;
  text-align: center;
  background: linear-gradient(135deg, rgba(0,217,166,0.15), rgba(0,217,166,0.05));
  border: 1px solid rgba(0,217,166,0.3);
  border-radius: var(--radius-xl);
}

.cta-card h2 {
  font-size: 42px;
  font-weight: 900;
  margin-bottom: 16px;
}

.cta-card p {
  font-size: 18px;
  color: var(--gray-300);
  margin-bottom: 32px;
}

@media (max-width: 768px) {
  .cta-section {
    padding: 60px 0;
  }
  
  .cta-card {
    padding: 60px 24px;
  }
  
  .cta-card h2 {
    font-size: 32px;
  }
}

/* === FOOTER === */
.footer {
  padding: 80px 0 40px;
  border-top: 1px solid rgba(255,255,255,0.05);
  background: var(--gray-900);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 80px;
}

.footer-brand p {
  margin: 16px 0 8px;
  color: var(--gray-400);
}

.footer-small {
  font-size: 13px;
  color: var(--gray-500);
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
  color: var(--gray-300);
}

.footer-col a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  color: var(--gray-400);
  transition: color var(--transition);
}

.footer-col a:hover {
  color: var(--accent);
}

@media (max-width: 768px) {
  .footer {
    padding: 60px 0 32px;
  }
  
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}