/* ─── Reset & Base ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:        #007AFF;
  --blue-dark:   #0056CC;
  --red:         #FF3B30;
  --green:       #34C759;
  --gray-1:      #1C1C1E;
  --gray-2:      #3A3A3C;
  --gray-3:      #636366;
  --gray-4:      #AEAEB2;
  --gray-5:      #E5E5EA;
  --gray-6:      #F2F2F7;
  --white:       #FFFFFF;
  --radius-sm:   10px;
  --radius-md:   16px;
  --radius-lg:   24px;
  --shadow:      0 4px 24px rgba(0,0,0,.08);
  --shadow-lg:   0 12px 48px rgba(0,0,0,.14);
  --nav-height:  56px;
  --font:        -apple-system, "SF Pro Display", BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-round:  -apple-system, "SF Pro Rounded", BlinkMacSystemFont, sans-serif;
}

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--white);
  color: var(--gray-1);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* ─── Nav ────────────────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: rgba(255,255,255,.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0,0,0,.08);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--gray-1);
  text-decoration: none;
}

.nav-brand .app-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  overflow: hidden;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-3);
  text-decoration: none;
  transition: color .15s;
}

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

/* ─── Hero ───────────────────────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 96px 24px 80px;
  background: linear-gradient(180deg, #F2F2F7 0%, #FFFFFF 100%);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0,122,255,.10);
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 100px;
  margin-bottom: 20px;
  letter-spacing: .2px;
}

.hero h1 {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 700;
  letter-spacing: -.5px;
  line-height: 1.1;
  margin-bottom: 20px;
  color: var(--gray-1);
}

.hero-sub {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--gray-3);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.5;
}

.btn-group {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform .15s, box-shadow .15s, opacity .15s;
  cursor: pointer;
  border: none;
}

.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn:active { transform: translateY(0); opacity: .85; }

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

.btn-secondary {
  background: var(--gray-6);
  color: var(--gray-1);
}

.app-store-badge {
  height: 44px;
  display: inline-block;
  background: var(--gray-1);
  color: var(--white);
  padding: 0 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  line-height: 44px;
  text-decoration: none;
  transition: opacity .15s;
}
.app-store-badge:hover { opacity: .85; }

/* ─── Section ────────────────────────────────────────────────────────── */
.section {
  padding: 80px 24px;
  max-width: 960px;
  margin: 0 auto;
}

.section-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .6px;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 10px;
}

.section h2 {
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -.3px;
  line-height: 1.15;
  margin-bottom: 16px;
}

.section-sub {
  font-size: 17px;
  color: var(--gray-3);
  max-width: 560px;
  margin-bottom: 48px;
  line-height: 1.55;
}

/* ─── Feature Grid ───────────────────────────────────────────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.feature-card {
  background: var(--gray-6);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: transform .2s, box-shadow .2s;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.feature-card p {
  font-size: 14px;
  color: var(--gray-3);
  line-height: 1.5;
}

/* ─── Highlight Banner ───────────────────────────────────────────────── */
.banner {
  background: linear-gradient(135deg, #007AFF 0%, #0056CC 100%);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  color: var(--white);
  margin: 0 24px;
}

.banner h2 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -.3px;
  margin-bottom: 12px;
}

.banner p {
  font-size: 17px;
  opacity: .85;
  max-width: 480px;
  margin: 0 auto 32px;
  line-height: 1.5;
}

/* ─── Privacy Pillars ────────────────────────────────────────────────── */
.pillar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.pillar {
  border: 1.5px solid var(--gray-5);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}

.pillar .icon { font-size: 32px; margin-bottom: 12px; display: block; }
.pillar h3 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.pillar p  { font-size: 13px; color: var(--gray-3); line-height: 1.5; }

/* ─── Language Switcher ──────────────────────────────────────────────── */
.lang-switcher {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.lang-switcher a {
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-3);
  text-decoration: none;
  padding: 4px 10px;
  border-radius: 100px;
  border: 1px solid var(--gray-5);
  transition: color .15s, border-color .15s, background .15s;
}
.lang-switcher a:hover { color: var(--blue); border-color: var(--blue); }
.lang-switcher a.active {
  color: var(--blue);
  border-color: var(--blue);
  background: rgba(0,122,255,.08);
  font-weight: 600;
}

/* ─── Prose (privacy / terms) ────────────────────────────────────────── */
.prose {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 24px;
}

.prose h1 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  letter-spacing: -.3px;
  margin-bottom: 8px;
}

.prose .meta {
  font-size: 14px;
  color: var(--gray-4);
  margin-bottom: 40px;
  display: block;
}

.prose h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 40px 0 10px;
}

.prose p, .prose li {
  font-size: 16px;
  color: var(--gray-2);
  line-height: 1.7;
  margin-bottom: 12px;
}

.prose ul { padding-left: 20px; }
.prose ul li { margin-bottom: 6px; }

.prose a { color: var(--blue); text-decoration: none; }
.prose a:hover { text-decoration: underline; }

.prose .callout {
  background: rgba(0,122,255,.07);
  border-left: 3px solid var(--blue);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 15px;
  color: var(--gray-1);
}

/* ─── FAQ ────────────────────────────────────────────────────────────── */
.faq-list { display: flex; flex-direction: column; gap: 2px; }

details {
  border-radius: var(--radius-sm);
  overflow: hidden;
}

details + details { margin-top: 2px; }

summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
  font-size: 16px;
  font-weight: 500;
  background: var(--gray-6);
  cursor: pointer;
  list-style: none;
  -webkit-appearance: none;
  gap: 12px;
}

summary::-webkit-details-marker { display: none; }

summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 300;
  color: var(--blue);
  flex-shrink: 0;
  transition: transform .2s;
}

details[open] summary::after { transform: rotate(45deg); }
details[open] summary { background: var(--gray-5); }

.faq-answer {
  padding: 16px 20px 20px;
  font-size: 15px;
  color: var(--gray-2);
  line-height: 1.65;
  background: var(--gray-6);
}

/* ─── Footer ─────────────────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--gray-5);
  padding: 40px 24px;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  list-style: none;
  margin-bottom: 16px;
}

.footer-links a {
  font-size: 13px;
  color: var(--gray-3);
  text-decoration: none;
  transition: color .15s;
}

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

footer p {
  font-size: 12px;
  color: var(--gray-4);
  line-height: 1.6;
}

/* ─── Divider ────────────────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--gray-5);
  margin: 0 24px;
}

/* ─── Dark mode ──────────────────────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  body { background: #000; color: #F5F5F7; }

  .nav {
    background: rgba(0,0,0,.72);
    border-bottom-color: rgba(255,255,255,.1);
  }

  .nav-brand { color: #F5F5F7; }

  .hero { background: linear-gradient(180deg, #1C1C1E 0%, #000 100%); }
  .hero h1 { color: #F5F5F7; }

  .feature-card { background: #1C1C1E; }
  .pillar { border-color: #3A3A3C; }

  .prose h1, .prose h2 { color: #F5F5F7; }
  .prose p, .prose li { color: #AEAEB2; }
  .prose .callout { background: rgba(0,122,255,.12); color: #F5F5F7; }

  summary { background: #1C1C1E; color: #F5F5F7; }
  details[open] summary { background: #2C2C2E; }
  .faq-answer { background: #1C1C1E; color: #AEAEB2; }

  .divider { background: #3A3A3C; }
  footer { border-top-color: #3A3A3C; }

  .lang-switcher a { color: #AEAEB2; border-color: #3A3A3C; }
  .lang-switcher a.active { color: var(--blue); border-color: var(--blue); background: rgba(0,122,255,.15); }
}

/* ─── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .nav-links { display: none; }
  .hero { padding: 64px 20px 56px; }
  .banner { padding: 40px 24px; margin: 0 16px; }
  .section { padding: 56px 20px; }
}