:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f5f5fb;
  --color-text: #191735;
  --color-text-muted: #5b5f76;
  --color-primary: #4955d9;
  --color-primary-dark: #383fb0;
  --color-navy: #1b0482;
  --color-navy-dark: #12035a;
  --color-border: #e5e5f0;
  --max-width: 1120px;
  --radius: 10px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", ui-monospace, "Courier New", monospace;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  line-height: 1.2;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: 1.15rem; }

p {
  margin: 0 0 1em;
  color: var(--color-text-muted);
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(6px);
  z-index: 10;
}

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

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}

.logo span {
  color: var(--color-primary);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  color: var(--color-text);
  font-weight: 500;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

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

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

.btn-ghost {
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

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

.btn-small {
  padding: 8px 18px;
  font-size: 0.9rem;
}

/* Hero */
.hero {
  padding: 96px 0 72px;
  background: radial-gradient(ellipse at top left, var(--color-navy) 0%, var(--color-navy-dark) 60%);
  color: #fff;
}

.hero-inner {
  max-width: 720px;
}

.hero h1 {
  color: #fff;
}

.hero-sub {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.75);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.hero .btn-ghost {
  border-color: rgba(255, 255, 255, 0.3);
  color: #fff;
}

.hero .btn-ghost:hover {
  border-color: #fff;
  color: #fff;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 12px;
}

.hero .eyebrow {
  color: #8890f2;
}

.app-store-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.apple-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Sections */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.about-inner,
.contact-inner {
  max-width: 640px;
}

.section-sub {
  max-width: 560px;
  font-size: 1.05rem;
}

/* Product showcase */
.product-inner {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: center;
}

.product-tagline {
  font-size: 1.1rem;
}

.feature-list {
  margin: 24px 0 32px;
  padding: 0;
  list-style: none;
}

.feature-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  color: var(--color-text-muted);
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--color-primary);
}

.product-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.price-note {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.promo-note {
  margin-top: 16px;
  font-size: 0.9rem;
}

.promo-note a {
  font-weight: 600;
}

.product-art {
  display: flex;
  justify-content: center;
}

.app-icon {
  width: 100%;
  max-width: 260px;
  border-radius: 22.5%;
  box-shadow: 0 24px 48px -12px rgba(27, 4, 130, 0.35);
}

/* Grid / cards */
.grid {
  display: grid;
  gap: 24px;
  margin-top: 32px;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.card {
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: rgba(73, 85, 217, 0.1);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
}

.footer-inner p {
  margin: 0;
  font-size: 0.9rem;
}

.footer-inner .disclaimer {
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  max-width: 680px;
}

/* Error page */
.error-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.error-inner {
  text-align: center;
}

.error-inner h1 {
  font-size: 5rem;
  color: var(--color-primary);
}

/* Responsive */
@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
  }

  .nav-list {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 24px;
    display: none;
  }

  .nav-list.is-open {
    display: flex;
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }

  .product-inner {
    grid-template-columns: 1fr;
  }

  .product-art {
    order: -1;
  }

  .app-icon {
    max-width: 160px;
  }
}