:root {
  color-scheme: light;
  --ink: #17191c;
  --muted: #5b626c;
  --line: #d8dde3;
  --paper: #ffffff;
  --soft: #f4f7f8;
  --green: #1f7a5a;
  --blue: #224f86;
  --amber: #b16626;
  --shadow: 0 18px 50px rgba(22, 31, 40, 0.14);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
}

a {
  color: inherit;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 22px 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
}

.brand img {
  border-radius: 8px;
}

nav {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

nav a {
  text-decoration: none;
}

.nav-cta {
  color: var(--green);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 430px);
  gap: 56px;
  align-items: center;
  max-width: 1120px;
  margin: 0 auto;
  min-height: 74vh;
  padding: 42px 24px 84px;
}

.hero h1 {
  max-width: 720px;
  margin: 0;
  font-size: 82px;
  line-height: 0.96;
  letter-spacing: 0;
}

.hero p {
  max-width: 640px;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.button.primary {
  border-color: var(--green);
  background: var(--green);
  color: #fff;
}

.button.secondary {
  background: #fff;
  color: var(--ink);
}

.session-preview {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.preview-topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--line);
  padding: 14px 16px;
  font-size: 13px;
}

.preview-topbar span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
}

.camera-frame {
  display: grid;
  place-items: center;
  aspect-ratio: 4 / 3;
  background:
    linear-gradient(135deg, rgba(34, 79, 134, 0.10), rgba(31, 122, 90, 0.12)),
    #eef3f5;
}

.camera-frame img {
  width: min(38%, 154px);
  border-radius: 26px;
  box-shadow: 0 18px 36px rgba(20, 28, 34, 0.16);
}

.transcript {
  display: grid;
  gap: 10px;
  padding: 16px;
  background: #fff;
}

.transcript p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.42;
}

.transcript strong {
  color: var(--ink);
}

.band {
  background: var(--soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 76px 24px;
}

.section-heading,
.feature-grid,
.launch-note,
.document {
  max-width: 1120px;
  margin: 0 auto;
}

.section-heading h2,
.launch-note h2,
.document h1 {
  margin: 0;
  font-size: 50px;
  line-height: 1.02;
  letter-spacing: 0;
}

.section-heading p,
.launch-note p,
.document p,
.document li {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.58;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-top: 42px;
}

.feature-grid article {
  border-left: 3px solid var(--green);
  padding: 4px 0 4px 18px;
}

.feature-grid article:nth-child(2) {
  border-left-color: var(--blue);
}

.feature-grid article:nth-child(3) {
  border-left-color: var(--amber);
}

.feature-grid h3,
.document h2 {
  margin: 0 0 10px;
  font-size: 20px;
}

.feature-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.55;
}

.launch-note {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding: 82px 24px;
}

.launch-note p {
  max-width: 720px;
}

.document {
  padding: 62px 24px 86px;
}

.document h2 {
  margin-top: 36px;
}

.updated {
  color: var(--amber);
  font-weight: 700;
}

.site-footer {
  display: flex;
  justify-content: center;
  gap: 18px;
  border-top: 1px solid var(--line);
  padding: 28px 24px;
  color: var(--muted);
  font-size: 14px;
}

.site-footer a {
  text-decoration: none;
}

@media (max-width: 820px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 28px;
  }

  .hero h1 {
    font-size: 58px;
  }

  .section-heading h2,
  .launch-note h2,
  .document h1 {
    font-size: 38px;
  }

  .feature-grid,
  .launch-note {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    display: grid;
  }

  .launch-note {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  nav {
    flex-wrap: wrap;
  }

  .hero h1 {
    font-size: 44px;
  }

  .hero p {
    font-size: 18px;
  }
}

@media (max-width: 520px) {
  nav {
    flex-wrap: wrap;
  }

  .hero,
  .band,
  .launch-note,
  .document {
    padding-left: 18px;
    padding-right: 18px;
  }

  .hero-actions,
  .button {
    width: 100%;
  }
}