/* EyeGuard landing — Apple Glass + Meridian brand */
:root {
  --bone:     #F2EFE8;
  --bone-2:   #E8E4DA;
  --ink:      #0E1116;
  --ink-2:    rgba(14, 17, 22, 0.72);
  --meridian: #3A4A5C;
  --signal:   #C44536;
  --mute:     #8A8E94;
  --hairline: rgba(14, 17, 22, 0.10);

  --font-sans: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --content-w: 1120px;
  --gutter: clamp(20px, 4vw, 48px);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bone);
  color: var(--ink);
  font-family: var(--font-sans);
  font-feature-settings: 'ss01', 'cv11';
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

a { color: var(--ink); text-decoration: none; }
a:hover { color: var(--meridian); }

/* Layout */
.wrap {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* Top bar */
.topbar {
  position: sticky; top: 0;
  background: rgba(242, 239, 232, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--hairline);
  z-index: 50;
}
.topbar .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 600; letter-spacing: -0.02em; font-size: 15px;
}
.brand-mark { width: 22px; height: 22px; }
.nav-links { display: flex; gap: 28px; font-size: 13px; color: var(--ink-2); }
.nav-links a:hover { color: var(--ink); }
.cta-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; background: var(--ink); color: var(--bone) !important;
  border-radius: 999px; font-size: 13px; font-weight: 500;
  transition: background 200ms ease;
}
.cta-pill:hover { background: var(--meridian); color: var(--bone) !important; }

/* Hero */
.hero {
  padding: clamp(64px, 12vw, 144px) 0 clamp(64px, 10vw, 120px);
}
.kicker {
  display: inline-block; font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--meridian); padding: 6px 12px;
  border: 1px solid var(--hairline); border-radius: 999px;
  margin-bottom: 28px;
}
.hero h1 {
  font-size: clamp(40px, 6.5vw, 76px);
  line-height: 0.98;
  letter-spacing: -0.04em;
  font-weight: 700;
  max-width: 18ch;
  margin-bottom: 24px;
}
.hero h1 .accent { color: var(--meridian); }
.hero p.lead {
  font-size: clamp(17px, 1.6vw, 21px);
  line-height: 1.5; color: var(--ink-2);
  max-width: 60ch; margin-bottom: 32px;
  font-weight: 400;
}
.hero-cta {
  display: flex; gap: 12px; flex-wrap: wrap;
  margin-bottom: 24px;
}
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--ink); color: var(--bone);
  padding: 14px 24px; border-radius: 12px;
  font-size: 15px; font-weight: 500;
  transition: transform 150ms ease, background 200ms ease;
}
.btn-primary:hover { background: var(--meridian); color: var(--bone); transform: translateY(-1px); }
.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--hairline); color: var(--ink);
  padding: 14px 24px; border-radius: 12px;
  font-size: 15px; font-weight: 500;
  transition: background 200ms ease;
}
.btn-secondary:hover { background: var(--bone-2); color: var(--ink); }
.hero-meta {
  font-family: var(--font-mono); font-size: 12px; color: var(--mute);
  letter-spacing: 0.04em;
}

/* Hero image */
.hero-fig {
  margin-top: clamp(40px, 6vw, 72px);
  border-radius: 18px; overflow: hidden;
  box-shadow: 0 1px 0 rgba(255,255,255,0.6) inset, 0 24px 60px -20px rgba(14,17,22,0.18);
  background: var(--bone-2);
}
.hero-fig img { width: 100%; display: block; }

/* Section */
section.block { padding: clamp(72px, 10vw, 120px) 0; border-top: 1px solid var(--hairline); }
.section-head { display: grid; grid-template-columns: 1fr 1.4fr; gap: 40px; align-items: end; margin-bottom: 56px; }
@media (max-width: 768px) { .section-head { grid-template-columns: 1fr; gap: 16px; } }
.section-head h2 {
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1.05; letter-spacing: -0.03em;
  font-weight: 700; max-width: 14ch;
}
.section-head p { color: var(--ink-2); font-size: 17px; line-height: 1.55; }

/* Feature grid */
.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
@media (max-width: 768px) { .features { grid-template-columns: 1fr; } }
.feature {
  background: #fff; border: 1px solid var(--hairline);
  border-radius: 14px; padding: 28px; display: flex; flex-direction: column; gap: 12px;
}
.feature .label {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--meridian);
}
.feature h3 { font-size: 22px; font-weight: 600; letter-spacing: -0.01em; }
.feature p { color: var(--ink-2); font-size: 14px; line-height: 1.55; }
.feature .stat { font-family: var(--font-mono); font-size: 13px; color: var(--mute); margin-top: 4px; }

/* Showcase */
.showcase { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
@media (max-width: 768px) { .showcase { grid-template-columns: 1fr; } }
.showcase img { width: 100%; border-radius: 14px; border: 1px solid var(--hairline); }
.showcase + .showcase { margin-top: 56px; }
.showcase.reverse > div:first-child { order: 2; }
@media (max-width: 768px) { .showcase.reverse > div:first-child { order: 0; } }
.showcase h3 { font-size: 32px; font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; margin-bottom: 16px; }
.showcase p { font-size: 16px; line-height: 1.6; color: var(--ink-2); margin-bottom: 12px; }
.showcase .meta { font-family: var(--font-mono); font-size: 12px; color: var(--mute); letter-spacing: 0.04em; }

/* Privacy promise */
.promises { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--hairline); border: 1px solid var(--hairline); border-radius: 14px; overflow: hidden; }
@media (max-width: 768px) { .promises { grid-template-columns: 1fr; } }
.promise { background: #fff; padding: 28px; }
.promise .num { font-family: var(--font-mono); font-size: 11px; color: var(--mute); letter-spacing: 0.18em; }
.promise h4 { font-size: 17px; font-weight: 600; margin: 8px 0; letter-spacing: -0.005em; }
.promise p { font-size: 13px; color: var(--ink-2); line-height: 1.55; }

/* Pricing */
.pricing { display: grid; grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; padding: 36px; border: 1px solid var(--hairline); border-radius: 18px; background: #fff; text-align: center; }
.pricing .price { font-family: var(--font-mono); font-size: 56px; font-weight: 600; letter-spacing: -0.02em; color: var(--ink); }
.pricing .price-sub { font-size: 13px; color: var(--mute); margin-bottom: 24px; }
.pricing ul { text-align: left; list-style: none; padding: 0; margin: 0 0 28px; }
.pricing li { font-size: 14px; color: var(--ink-2); padding: 8px 0; border-bottom: 1px solid var(--hairline); display: flex; align-items: center; gap: 10px; }
.pricing li:last-child { border-bottom: none; }
.pricing li::before { content: ''; width: 14px; height: 1.5px; background: var(--meridian); }
.pricing .btn-primary { display: block; text-align: center; }

/* Footer */
footer.foot {
  border-top: 1px solid var(--hairline);
  padding: 48px 0 64px; color: var(--mute); font-size: 13px;
}
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
@media (max-width: 768px) { .foot-grid { grid-template-columns: 1fr 1fr; gap: 24px; } }
.foot-grid h5 { font-size: 13px; font-weight: 600; color: var(--ink); margin-bottom: 12px; letter-spacing: -0.01em; }
.foot-grid a { display: block; padding: 4px 0; color: var(--ink-2); font-size: 13px; }
.foot-grid a:hover { color: var(--ink); }
.foot-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 24px; border-top: 1px solid var(--hairline); font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.04em; color: var(--mute); }
@media (max-width: 600px) { .foot-bottom { flex-direction: column; gap: 8px; align-items: flex-start; } }

/* Long-form (privacy/support) */
.prose { max-width: 720px; margin: 0 auto; padding: clamp(48px, 8vw, 96px) 0; }
.prose h1 { font-size: clamp(36px, 5vw, 56px); letter-spacing: -0.03em; line-height: 1.05; margin-bottom: 16px; }
.prose .subtitle { font-size: 17px; color: var(--ink-2); margin-bottom: 48px; line-height: 1.5; }
.prose h2 { font-size: 26px; font-weight: 700; letter-spacing: -0.02em; margin: 56px 0 16px; }
.prose h3 { font-size: 18px; font-weight: 600; margin: 32px 0 8px; }
.prose p, .prose li { font-size: 15px; line-height: 1.7; color: var(--ink-2); margin-bottom: 12px; }
.prose ul, .prose ol { padding-left: 24px; margin-bottom: 16px; }
.prose code { font-family: var(--font-mono); font-size: 12px; background: var(--bone-2); padding: 2px 6px; border-radius: 4px; color: var(--ink); }
.prose .callout { background: #fff; border: 1px solid var(--hairline); border-left: 3px solid var(--meridian); border-radius: 8px; padding: 20px; margin: 24px 0; }
.prose .callout p { margin-bottom: 0; color: var(--ink); font-size: 14px; }
.prose hr { border: none; border-top: 1px solid var(--hairline); margin: 48px 0; }

/* FAQ */
.faq details { background: #fff; border: 1px solid var(--hairline); border-radius: 12px; padding: 20px 24px; margin-bottom: 12px; cursor: pointer; }
.faq summary { font-weight: 600; font-size: 16px; color: var(--ink); list-style: none; outline: none; display: flex; justify-content: space-between; align-items: center; }
.faq summary::after { content: '+'; font-family: var(--font-mono); font-size: 20px; color: var(--mute); }
.faq details[open] summary::after { content: '−'; }
.faq details p { margin-top: 12px; color: var(--ink-2); font-size: 14px; line-height: 1.65; }

/* Bilingual */
.zh { color: var(--mute); font-size: 0.92em; display: block; margin-top: 4px; }
.zh-block { color: var(--mute); font-size: 0.92em; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}