:root {
  color-scheme: light;
  --ink: #171a1f;
  --muted: #5b6470;
  --line: #d8dde3;
  --paper: #f7f8f6;
  --white: #ffffff;
  --green: #1f6b4f;
  --green-dark: #104534;
  --gold: #c78a2c;
  --blue: #4657d9;
  --danger: #8f302b;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
  padding: 0 36px;
  color: #ffffff;
  background: rgba(14, 17, 20, 0.82);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: #ffffff;
  color: var(--green-dark);
  font-size: 18px;
  font-weight: 900;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
  font-weight: 700;
}

.site-nav a {
  text-decoration: none;
  color: rgba(255, 255, 255, 0.84);
}

.site-nav a:hover {
  color: #ffffff;
}

.nav-download {
  padding: 9px 14px;
  border-radius: 8px;
  background: #ffffff;
  color: var(--green-dark) !important;
}

.hero {
  min-height: 92vh;
  display: grid;
  align-items: end;
  position: relative;
  color: #ffffff;
  background:
    linear-gradient(90deg, rgba(5, 10, 12, 0.94) 0%, rgba(8, 13, 15, 0.78) 37%, rgba(8, 13, 15, 0.3) 72%),
    url("assets/secure-pair-app-demo.png") center right / cover no-repeat;
  padding: 120px 36px 78px;
}

.hero-inner {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.9);
  font-size: 13px;
  font-weight: 800;
}

.hero h1 {
  max-width: 760px;
  margin: 18px 0 16px;
  font-size: clamp(44px, 6vw, 78px);
  line-height: 1;
  letter-spacing: 0;
}

.hero p {
  max-width: 670px;
  margin: 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: 19px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
  text-decoration: none;
}

.button-primary {
  background: var(--gold);
  color: #16120b;
}

.button-secondary {
  border-color: rgba(255, 255, 255, 0.34);
  color: #ffffff;
}

.button-secondary.dark {
  border-color: var(--line);
  color: var(--green-dark);
  background: #ffffff;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
  color: rgba(255, 255, 255, 0.76);
  font-size: 14px;
}

.section {
  padding: 74px 36px;
}

.section-inner {
  width: min(1120px, 100%);
  margin: 0 auto;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 30px;
}

.section-heading h2 {
  margin: 0 0 10px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.08;
  letter-spacing: 0;
}

.section-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.feature {
  min-height: 190px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.feature h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

.feature p {
  margin: 0;
  color: var(--muted);
}

.product-band {
  background: #20242a;
  color: #ffffff;
}

.product-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.2fr;
  align-items: center;
  gap: 38px;
}

.product-copy p {
  color: rgba(255, 255, 255, 0.74);
}

.screenshot {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.34);
}

.download-band {
  background: #ffffff;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.download-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: start;
}

.download-panel {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f9faf8;
}

.download-panel h3 {
  margin: 0 0 10px;
}

.download-details {
  display: grid;
  gap: 8px;
  margin: 18px 0;
  color: var(--muted);
  font-size: 14px;
}

.hash {
  overflow-wrap: anywhere;
  margin-bottom: 18px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: #333941;
  font-family: Consolas, "Courier New", monospace;
  font-size: 12px;
}

.notice {
  padding: 14px 16px;
  border-left: 4px solid var(--gold);
  background: #fff8eb;
  color: #49341a;
}

.policy-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.page {
  padding: 118px 36px 74px;
}

.page article {
  width: min(860px, 100%);
  margin: 0 auto;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.page h1 {
  margin: 0 0 12px;
  font-size: 42px;
}

.page h2 {
  margin-top: 30px;
}

.page p,
.page li {
  color: var(--muted);
}

.site-footer {
  padding: 32px 36px;
  color: rgba(255, 255, 255, 0.74);
  background: #111417;
}

.footer-inner {
  width: min(1120px, 100%);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
}

@media (max-width: 860px) {
  .site-header {
    position: absolute;
    padding: 0 20px;
  }

  .site-nav {
    gap: 10px;
    font-size: 13px;
  }

  .site-nav a:not(.nav-download) {
    display: none;
  }

  .hero {
    min-height: 88vh;
    padding: 104px 22px 60px;
    background:
      linear-gradient(180deg, rgba(5, 10, 12, 0.92) 0%, rgba(8, 13, 15, 0.76) 58%, rgba(8, 13, 15, 0.56) 100%),
      url("assets/secure-pair-app-demo.png") center / cover no-repeat;
  }

  .hero p {
    font-size: 17px;
  }

  .section {
    padding: 54px 22px;
  }

  .feature-grid,
  .product-layout,
  .download-layout {
    grid-template-columns: 1fr;
  }

  .page {
    padding: 96px 20px 52px;
  }

  .page article {
    padding: 24px;
  }
}