/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */
:root {
  /* Brand Colors */
  --color-primary: #4A7FB8;
  --color-secondary: #4E9BB8;
  --color-accent: #5FC9A8;
  
  /* Semantic Colors */
  --color-success: #34C759;
  --color-warning: #FF9500;
  
  /* Neutral Palette */
  --color-neutral-900: #1C1C1E;
  --color-neutral-700: #48484A;
  --color-neutral-500: #8E8E93;
  --color-neutral-100: #F2F2F7;
  --color-white: #FFFFFF;
  
  /* Derived Colors */
  --color-soft-blue: #E8F4F9;
  --color-bg-light: #FAFBFC;
  --color-bg-gradient-end: #F0F4F8;
  
  /* Gradients */
  --gradient-brand: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-accent) 100%);
  --gradient-brand-horizontal: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  --gradient-bg-light: linear-gradient(135deg, var(--color-bg-light) 0%, var(--color-bg-gradient-end) 100%);
  --gradient-text-dark: linear-gradient(135deg, var(--color-neutral-900) 0%, var(--color-neutral-700) 100%);
  
  /* Typography */
  --font-display: 'Cabinet Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Font Sizes (fluid typography) */
  --text-xs: 0.85rem;
  --text-sm: 0.9rem;
  --text-base: 1rem;
  --text-lg: 1.1rem;
  --text-xl: 1.25rem;
  --text-2xl: clamp(1.5rem, 3vw, 2rem);
  --text-3xl: clamp(2rem, 4vw, 3.5rem);
  --text-4xl: clamp(2.5rem, 5vw, 4.5rem);
  
  /* Spacing Scale */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 2.5rem;
  --space-3xl: 3rem;
  --space-4xl: 4rem;
  --space-5xl: 5rem;
  --space-6xl: 6rem;
  --space-8xl: 8rem;
  
  /* Layout */
  --container-max: 1440px;
  --container-narrow: 1200px;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 14px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  --radius-3xl: 24px;
  --radius-full: 9999px;
  --radius-phone: 50px;
  --radius-phone-screen: 42px;
  
  /* Shadows */
  --shadow-sm: 0 8px 24px rgba(0, 122, 255, 0.3);
  --shadow-md: 0 12px 32px rgba(0, 122, 255, 0.3);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 40px 80px rgba(0, 0, 0, 0.15);
  --shadow-card: 0 20px 40px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 0.3s ease;
  --transition-base: 0.4s ease;
  --transition-slow: 0.5s ease;
  --transition-spring: 0.6s ease-out;
}

/* ========================================
   CSS Reset & Base Styles
   ======================================== */
*,
*::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-body);
  font-size: var(--text-base);
  color: var(--color-neutral-900);
  line-height: 1.6;
  background: var(--color-white);
  overflow-x: hidden;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--text-4xl);
  font-weight: 800;
}

h2 {
  font-size: var(--text-3xl);
}

h3 {
  font-size: var(--text-2xl);
}

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

ul {
  list-style: none;
}

/* ========================================
   Layout Components
   ======================================== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-inline: var(--space-xl);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding-block: var(--space-8xl);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-5xl);
}

/* ========================================
   Navigation
   ======================================== */
.nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  z-index: 1000;
  animation: slideDown var(--transition-spring);
}

.nav__container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: var(--space-lg);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.logo__icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

.logo__text {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.03em;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  font-family: var(--font-body);
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn--primary {
  background: var(--color-neutral-900);
  color: var(--color-white);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-lg);
  font-size: var(--text-lg);
  border: 2px solid var(--color-neutral-900);
}

.btn--primary:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  color: var(--color-neutral-700);
  font-size: var(--text-lg);
  background: transparent;
  padding: 0;
}

.btn--secondary:hover {
  color: var(--color-primary);
}

.btn--nav {
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
}

/* ========================================
   Badge Component
   ======================================== */
.badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
}

.badge--primary {
  background: var(--color-soft-blue);
  color: var(--color-primary);
}

.badge--neutral {
  background: var(--color-neutral-100);
  color: var(--color-neutral-700);
}

.badge--light {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
  backdrop-filter: blur(10px);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  padding: 10rem var(--space-xl) var(--space-6xl);
  background: var(--gradient-bg-light);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(74, 127, 184, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  animation: float 20s ease-in-out infinite;
}

.hero__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

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

.hero__badge {
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.hero__title {
  margin-bottom: var(--space-lg);
  background: var(--gradient-text-dark);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease-out 0.3s backwards;
}

.hero__subtitle {
  font-size: var(--text-xl);
  color: var(--color-neutral-700);
  margin-bottom: var(--space-2xl);
  line-height: 1.6;
  animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  animation: fadeInUp 0.8s ease-out 0.5s backwards;
}

/* Hero Phone Mockup */
.hero__mockup {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

.phone-frame {
  width: 100%;
  max-width: 360px;
  border-radius: var(--radius-phone);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  background: var(--color-neutral-900);
  padding: 12px;
  transition: transform var(--transition-slow);
}

.phone-frame:hover {
  transform: scale(1.02) rotateY(5deg);
}

.phone-frame__screen {
  border-radius: var(--radius-phone-screen);
  overflow: hidden;
  background: var(--color-white);
}

.phone-frame__screen img {
  width: 100%;
  height: auto;
  display: block;
}

/* Screenshot Placeholder */
.screenshot-placeholder {
  width: 100%;
  aspect-ratio: 9/19.5;
  background: linear-gradient(135deg, #F2F2F7 0%, #E5E5EA 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-xl);
  text-align: center;
  color: var(--color-neutral-500);
}

.screenshot-placeholder__icon {
  font-size: 3rem;
  opacity: 0.5;
}

.screenshot-placeholder__text {
  font-size: var(--text-sm);
  font-weight: 500;
}

/* ========================================
   Features Section
   ======================================== */
.features {
  background: var(--color-white);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-3xl);
}

/* Feature Card */
.feature-card {
  background: var(--color-white);
  border: 1px solid var(--color-neutral-100);
  border-radius: var(--radius-3xl);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-brand-horizontal);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-card__icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-brand);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--space-lg);
}

.feature-card__title {
  margin-bottom: var(--space-md);
  color: var(--color-neutral-900);
}

.feature-card__description {
  color: var(--color-neutral-700);
  line-height: 1.7;
}

/* ========================================
   Screenshots Gallery Section
   ======================================== */
.screenshots {
  background: var(--gradient-bg-light);
}

.screenshots__scroll {
  display: flex;
  gap: var(--space-xl);
  overflow-x: auto;
  padding: var(--space-xl) 0;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.screenshots__scroll::-webkit-scrollbar {
  height: 8px;
}

.screenshots__scroll::-webkit-scrollbar-track {
  background: var(--color-neutral-100);
  border-radius: 4px;
}

.screenshots__scroll::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: 4px;
}

/* Screenshot Item */
.screenshot-item {
  flex-shrink: 0;
  scroll-snap-align: center;
  width: 280px;
}

.screenshot-item__frame {
  border-radius: 32px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  background: var(--color-neutral-900);
  padding: 8px;
  transition: transform var(--transition-fast);
}

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

.screenshot-item__screen {
  border-radius: 26px;
  overflow: hidden;
  background: var(--color-white);
}

.screenshot-item__screen img {
  width: 100%;
  height: auto;
  display: block;
}

/* Screenshot Image (shared) */
.screenshot-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.screenshot-item__label {
  text-align: center;
  margin-top: var(--space-md);
  font-weight: 600;
  color: var(--color-neutral-700);
}

/* No-frame variant for pre-styled screenshots */
.screenshot-item--no-frame {
  width: 320px;
}

.screenshot-item--no-frame img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-fast);
}

.screenshot-item--no-frame:hover img {
  transform: translateY(-8px);
}

/* ========================================
   How It Works Section
   ======================================== */
.how-it-works {
  background: var(--color-neutral-100);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-4xl);
}

.step {
  text-align: center;
  padding: var(--space-xl);
}

.step__number {
  width: 56px;
  height: 56px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto var(--space-lg);
}

.step__title {
  margin-bottom: var(--space-sm);
  font-size: var(--text-xl);
}

.step__description {
  color: var(--color-neutral-700);
}

/* ========================================
   Premium Features Section
   ======================================== */
.premium {
  background: var(--gradient-brand);
  color: var(--color-white);
}

.premium__container {
  text-align: center;
}

.premium__header {
  margin-bottom: var(--space-4xl);
}

.premium__title {
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.premium__subtitle {
  font-size: var(--text-xl);
  opacity: 0.95;
  max-width: 700px;
  margin: 0 auto;
}

.premium__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  margin-top: var(--space-4xl);
}

/* Premium Card */
.premium-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-2xl);
  padding: var(--space-xl);
  text-align: left;
  transition: all var(--transition-fast);
}

.premium-card:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-4px);
}

.premium-card__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
}

.premium-card__title {
  color: var(--color-white);
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
}

.premium-card__description {
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.6;
}

.premium__note {
  margin-top: var(--space-3xl);
  font-size: 0.95rem;
  opacity: 0.9;
  font-style: italic;
}

/* ========================================
   Trust Section
   ======================================== */
.trust {
  padding-block: var(--space-6xl);
  background: var(--color-white);
}

.trust__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-3xl);
}

.trust-item {
  text-align: center;
}

.trust-item__icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

.trust-item__title {
  margin-bottom: var(--space-xs);
  font-size: var(--text-lg);
}

.trust-item__description {
  color: var(--color-neutral-700);
  font-size: 0.95rem;
}

/* ========================================
   CTA Section
   ======================================== */
.cta {
  background: var(--color-neutral-100);
  text-align: center;
}

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

.cta__subtitle {
  font-size: var(--text-xl);
  color: var(--color-neutral-700);
  margin-bottom: var(--space-2xl);
}

.cta__note {
  margin-top: var(--space-lg);
  font-size: var(--text-base);
  color: var(--color-neutral-500);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--color-neutral-900);
  color: var(--color-white);
  padding: var(--space-4xl) var(--space-xl) var(--space-xl);
}

.footer__container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-4xl);
  margin-bottom: var(--space-3xl);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.footer__brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.footer__description {
  color: var(--color-neutral-500);
  line-height: 1.6;
}

.footer__section-title {
  margin-bottom: var(--space-lg);
  font-size: var(--text-base);
}

.footer__links li {
  margin-bottom: var(--space-sm);
}

.footer__links a {
  color: var(--color-neutral-500);
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-white);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-xl);
  text-align: center;
  color: var(--color-neutral-500);
}

/* ========================================
   Animations
   ======================================== */
@keyframes slideDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

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

@keyframes float {
  0%, 100% { 
    transform: translate(0, 0) scale(1); 
  }
  50% { 
    transform: translate(-50px, -30px) scale(1.1); 
  }
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
  .hero__container {
    gap: var(--space-3xl);
  }
  
  .footer__container {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
  }
}

@media (max-width: 768px) {
  .hero {
    padding: var(--space-8xl) var(--space-lg) var(--space-4xl);
  }
  
  .hero__container {
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
  }
  
  .hero__mockup {
    order: -1;
  }
  
  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn--primary,
  .btn--secondary {
    text-align: center;
  }
  
  .features__grid,
  .steps,
  .trust__grid,
  .premium__grid {
    grid-template-columns: 1fr;
  }
  
  .footer__container {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .screenshot-item {
    width: 240px;
  }
  
  .section {
    padding-block: var(--space-6xl);
  }
}

@media (max-width: 480px) {
  :root {
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
  }
  
  .container {
    padding-inline: var(--space-md);
  }
}