/* ===== CSS Variables ===== */
:root {
  --color-bg: #1C1C1E;
  --color-bg-secondary: #2C2C2E;
  --color-bg-tertiary: #3A3A3C;
  --color-accent: #4B49E5;
  --color-accent-light: #6B69FF;
  --color-accent-dark: #3B39C5;
  --color-text: #FFFFFF;
  --color-text-secondary: #8E8E93;
  --color-text-muted: #636366;
  --color-border: rgba(255, 255, 255, 0.1);
  
  --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;
  --border-radius-full: 9999px;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  --max-width: 1200px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  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-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: rgba(28, 28, 30, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.nav-cta {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-accent);
  border-radius: var(--border-radius-full);
  color: var(--color-text) !important;
  font-weight: 600;
}

.nav-cta:hover {
  background: var(--color-accent-light);
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(80px + var(--spacing-2xl)) var(--spacing-lg) var(--spacing-2xl);
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  width: 100%;
}

.hero-text {
  z-index: 2;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 50%, #A78BFA 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
  line-height: 1.7;
}

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

/* App Store Button */
.app-store-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1.25rem;
  background: var(--color-text);
  color: var(--color-bg);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-normal);
}

.app-store-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 40px rgba(75, 73, 229, 0.3);
}

.app-store-btn.large {
  padding: 0.75rem 1.5rem;
}

.apple-icon {
  width: 36px;
  height: 36px;
}

.btn-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
}

.btn-small {
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn-large {
  font-size: 1.2rem;
  font-weight: 600;
}

/* Phone Showcase */
.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2;
}

.phone-showcase {
  position: relative;
  transition: transform var(--transition-slow);
}

.phone-showcase:hover {
  transform: translateY(-10px) scale(1.02);
}

.phone-showcase .app-screenshot {
  width: auto;
  height: 580px;
  max-width: 100%;
  object-fit: contain;
  position: relative;
  z-index: 2;
  filter: drop-shadow(0 30px 60px rgba(0, 0, 0, 0.5))
          drop-shadow(0 10px 20px rgba(0, 0, 0, 0.4));
  transition: all var(--transition-normal);
}

.phone-showcase:hover .app-screenshot {
  filter: drop-shadow(0 40px 80px rgba(75, 73, 229, 0.4))
          drop-shadow(0 15px 30px rgba(0, 0, 0, 0.5));
}

.phone-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--color-accent) 0%, rgba(75, 73, 229, 0.3) 30%, transparent 70%);
  opacity: 0.4;
  filter: blur(80px);
  z-index: 1;
  animation: pulse 4s ease-in-out infinite;
  pointer-events: none;
}

.phone-showcase:hover .phone-glow {
  opacity: 0.6;
  animation: none;
  transform: translate(-50%, -50%) scale(1.1);
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 0.5; transform: translate(-50%, -50%) scale(1.1); }
}

.hero-gradient {
  position: absolute;
  top: 0;
  right: 0;
  width: 60%;
  height: 100%;
  background: radial-gradient(ellipse at 70% 30%, rgba(75, 73, 229, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

/* ===== Features Section ===== */
.features {
  padding: var(--spacing-3xl) var(--spacing-lg);
  position: relative;
}

.features-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

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

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.feature-card {
  background: linear-gradient(145deg, var(--color-bg-secondary) 0%, rgba(44, 44, 46, 0.5) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-normal);
  opacity: 0;
  transform: translateY(30px);
}

.feature-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(75, 73, 229, 0.3);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.feature-icon {
  width: 80px;
  height: 80px;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Placeholder icon styles (when images are not available) */
.feature-icon-placeholder {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.feature-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.feature-description {
  color: var(--color-text-secondary);
  line-height: 1.7;
  font-size: 1rem;
}

/* ===== CTA Section ===== */
.cta-section {
  padding: var(--spacing-3xl) var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

.cta-container {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.cta-content {
  text-align: center;
  background: linear-gradient(145deg, var(--color-bg-secondary) 0%, rgba(44, 44, 46, 0.8) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-3xl) var(--spacing-xl);
  position: relative;
  z-index: 2;
}

.cta-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.02em;
}

.cta-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.cta-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 500px;
  height: 300px;
  background: radial-gradient(ellipse, var(--color-accent) 0%, transparent 70%);
  opacity: 0.15;
  filter: blur(80px);
  z-index: 1;
}

/* ===== Footer ===== */
.footer {
  padding: var(--spacing-xl) var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.footer-brand .logo-text {
  font-size: 1.25rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.footer-tagline {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

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

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-2xl);
  }
  
  .hero-text {
    order: 1;
  }
  
  .hero-image {
    order: 2;
  }
  
  .hero-description {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .phone-showcase:hover {
    transform: translateY(-8px) scale(1.01);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
  }
  
  .navbar {
    padding: var(--spacing-sm);
  }
  
  .nav-links a:not(.nav-cta) {
    display: none;
  }
  
  .hero {
    min-height: auto;
    padding-top: calc(70px + var(--spacing-xl));
    padding-bottom: var(--spacing-xl);
  }
  
  .phone-showcase .app-screenshot {
    height: 500px;
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--spacing-lg);
    text-align: center;
  }
  
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-description {
    font-size: 1rem;
  }
  
  .phone-showcase .app-screenshot {
    height: 420px;
  }
  
  .feature-card {
    padding: var(--spacing-lg);
  }
  
  .cta-content {
    padding: var(--spacing-xl) var(--spacing-lg);
  }
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.hero-image {
  animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

/* Smooth scroll offset for fixed header */
html {
  scroll-padding-top: 80px;
}