/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors */
  --bg-dark: #0f172a;
  --surface: #1e293b;
  --card-surface: #334155;
  --primary: #6366f1;
  --primary-hover: #818cf8;
  --secondary: #10b981;
  --secondary-hover: #34d399;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #334155;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Scale (1.25 ratio) */
  --text-xs: 0.8rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.563rem;
  --text-2xl: 1.953rem;
  --text-3xl: 2.441rem;
  --text-4xl: 3.052rem;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Misc */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: 0.3s ease;
  --nav-height: 72px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

/* ===== UTILITIES ===== */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.mono {
  font-family: var(--font-mono);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
}

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

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

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

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary-hover);
  transform: translateY(-1px);
}

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

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

.nav-logo-img {
  width: 36px;
  height: 36px;
}

.nav-wordmark {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  position: relative;
  transition: background var(--transition);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: transform var(--transition);
}

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  top: 7px;
}

.nav-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(99, 102, 241, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, 0.06) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black, transparent);
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: -20%;
  width: 80%;
  height: 80%;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.12) 0%, transparent 60%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  right: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  z-index: 1;
}

.hero-heading {
  font-size: clamp(var(--text-2xl), 5vw, var(--text-4xl));
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
}

.hero-subtext {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.7;
}

/* ===== SECTIONS ===== */
.section {
  padding: var(--space-4xl) 0;
}

.section-heading {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: var(--space-md);
}

.section-description {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-3xl);
  line-height: 1.7;
}

/* ===== ABOUT CARDS ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

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

.card-title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.card-text {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.7;
}

/* ===== PRODUCT SHOWCASE ===== */
.product {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.product-badge {
  text-align: center;
  margin-bottom: var(--space-md);
}

.product-badge .mono {
  display: inline-block;
  font-size: var(--text-xs);
  color: var(--secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--space-xs) var(--space-md);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 999px;
}

.product-tagline {
  text-align: center;
  font-size: var(--text-lg);
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.product-visual {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: var(--space-xl);
  margin: var(--space-3xl) 0;
}

/* Browser frame */
.browser-frame {
  width: 100%;
  max-width: 560px;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.browser-bar {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: rgba(15, 23, 42, 0.8);
  border-bottom: 1px solid var(--border);
}

.browser-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--card-surface);
}

.browser-dot:first-child { background: #ef4444; }
.browser-dot:nth-child(2) { background: #eab308; }
.browser-dot:nth-child(3) { background: #22c55e; }

.browser-url {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-left: var(--space-sm);
}

.browser-body {
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: center;
  justify-content: center;
}

.placeholder-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  color: var(--text-muted);
  font-size: var(--text-sm);
}

.placeholder-screen--small {
  gap: var(--space-sm);
  font-size: var(--text-xs);
}

/* Phone frame */
.phone-frame {
  width: 160px;
  flex-shrink: 0;
  background: var(--bg-dark);
  border: 2px solid var(--border);
  border-radius: 24px;
  padding: var(--space-xs);
  position: relative;
}

.phone-notch {
  width: 60px;
  height: 6px;
  background: var(--card-surface);
  border-radius: 999px;
  margin: var(--space-xs) auto var(--space-sm);
}

.phone-body {
  aspect-ratio: 9 / 16;
  background: var(--surface);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Product actions */
.product-actions {
  text-align: center;
}

.platform-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

.platform-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* ===== FEATURES GRID ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.feature-card:hover {
  transform: translateY(-3px);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25);
}

.feature-icon {
  margin-bottom: var(--space-md);
}

.feature-title {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

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

/* ===== DOWNLOAD / PLATFORM ===== */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.platform-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}

.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.platform-icon {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.platform-title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.platform-text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-2xl) 0;
}

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

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

.footer-logo {
  width: 28px;
  height: 28px;
}

.footer-company {
  font-size: var(--text-sm);
  font-weight: 600;
}

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

.footer-link {
  font-size: var(--text-sm);
  color: var(--text-muted);
  transition: color var(--transition);
}

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

.footer-meta {
  text-align: right;
}

.footer-copy {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.footer-locale {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ===== ANIMATIONS ===== */
.fade-in-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.card-grid .fade-in-up:nth-child(2),
.feature-grid .fade-in-up:nth-child(2),
.platform-grid .fade-in-up:nth-child(2) {
  transition-delay: 0.1s;
}

.card-grid .fade-in-up:nth-child(3),
.feature-grid .fade-in-up:nth-child(3),
.platform-grid .fade-in-up:nth-child(3) {
  transition-delay: 0.2s;
}

.feature-grid .fade-in-up:nth-child(4) {
  transition-delay: 0.1s;
}

.feature-grid .fade-in-up:nth-child(5) {
  transition-delay: 0.2s;
}

.feature-grid .fade-in-up:nth-child(6) {
  transition-delay: 0.3s;
}

.feature-grid .fade-in-up:nth-child(7) {
  transition-delay: 0.1s;
}

.feature-grid .fade-in-up:nth-child(8) {
  transition-delay: 0.2s;
}

/* ===== RESPONSIVE ===== */

/* Tablet */
@media (max-width: 1024px) {
  .card-grid,
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .platform-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .platform-card:last-child {
    grid-column: 1 / -1;
    max-width: 400px;
    margin: 0 auto;
  }

  .product-visual {
    gap: var(--space-lg);
  }

  .browser-frame {
    max-width: 440px;
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: center;
    padding: var(--space-xl) 0;
    gap: var(--space-lg);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .hero-heading {
    font-size: var(--text-2xl);
  }

  .hero-subtext {
    font-size: var(--text-base);
  }

  .section {
    padding: var(--space-3xl) 0;
  }

  .section-heading {
    font-size: var(--text-2xl);
  }

  .section-description {
    font-size: var(--text-base);
  }

  .card-grid,
  .feature-grid,
  .platform-grid {
    grid-template-columns: 1fr;
  }

  .platform-card:last-child {
    max-width: none;
  }

  .product-visual {
    flex-direction: column;
    align-items: center;
  }

  .phone-frame {
    width: 140px;
  }

  .footer-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .footer-meta {
    text-align: center;
  }
}

/* Small mobile */
@media (max-width: 400px) {
  .container {
    padding: 0 var(--space-md);
  }

  .hero-heading {
    font-size: var(--text-xl);
  }
}