:root {
  --teal: #11abb0;
  --teal-dark: #0c868a;
  --dark: #13171b;
  --dark-2: #1c2228;
  --ink: #2b3138;
  --muted: #7a858f;
  --bg: #f4f6f7;
  --card: #ffffff;
  --line: #e1e6e9;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--teal-dark);
}

a:hover {
  color: var(--teal);
}

.in {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}

.top {
  background: var(--dark);
  position: sticky;
  top: 0;
  z-index: 10;
}

.top .in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 70px;
}

.logo {
  display: block;
  line-height: 0;
}

.logo img {
  width: 162px;
  height: 54px;
}

.menu {
  display: flex;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu a {
  display: block;
  padding: 8px 14px;
  color: #e8edf0;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

.menu a:hover,
.menu a.cur {
  background: var(--teal);
  color: #fff;
}

.menu-btn {
  display: none;
  border: 1px solid #3a444d;
  background: transparent;
  color: #fff;
  padding: 8px 14px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.hero {
  background: linear-gradient(135deg, #13171b 0%, #1f2a31 100%);
  color: #fff;
  padding: 64px 0 0;
  overflow: hidden;
}

.hero .in {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: end;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: 40px;
  line-height: 1.15;
}

.hero p {
  margin: 0 0 24px;
  color: #c3ced6;
  font-size: 18px;
}

.hero-text {
  padding-bottom: 56px;
}

.hero-image {
  display: block;
  width: 100%;
}

.small-hero {
  background: linear-gradient(135deg, #13171b 0%, #1f2a31 100%);
  color: #fff;
  padding: 44px 0 40px;
}

.small-hero h1 {
  margin: 0 0 8px;
  font-size: 36px;
  line-height: 1.2;
}

.small-hero p {
  margin: 0;
  color: #c3ced6;
  max-width: 720px;
}

.crumbs {
  font-size: 14px;
  color: #8fa0ab;
  margin-bottom: 12px;
}

.crumbs a {
  color: #8fa0ab;
}

.btn {
  display: inline-block;
  background: var(--teal);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: 12px 26px;
  border: 2px solid var(--teal);
  font-size: 16px;
  cursor: pointer;
  font-family: inherit;
}

.btn:hover {
  background: var(--teal-dark);
  border-color: var(--teal-dark);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border-color: #6c7a85;
  color: #fff;
  margin-left: 8px;
}

.btn-ghost:hover {
  background: #fff;
  border-color: #fff;
  color: var(--dark);
}

.section {
  padding: 60px 0;
}

.section.alt {
  background: #fff;
}

.section.dark {
  background: var(--dark-2);
  color: #fff;
}

.section.dark p {
  color: #c3ced6;
}

.section h2 {
  margin: 0 0 14px;
  font-size: 30px;
  line-height: 1.25;
}

.section .lead {
  max-width: 760px;
  margin: 0 0 28px;
}

.center {
  text-align: center;
}

.center .lead {
  margin-left: auto;
  margin-right: auto;
}

.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  margin: 0 0 48px;
}

.feature:last-child {
  margin-bottom: 0;
}

.feature.rev .feature-text {
  order: 2;
}

.feature h3 {
  margin: 0 0 10px;
  font-size: 24px;
}

.feature p {
  margin: 0;
}

.feature img {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
}

.note-box {
  background: #eef9f9;
  border-left: 4px solid var(--teal);
  padding: 22px 26px;
}

.note-box h3 {
  margin: 0 0 8px;
  font-size: 22px;
}

.note-box p {
  margin: 0;
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

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

.card {
  background: var(--card);
  border: 1px solid var(--line);
}

.card img {
  display: block;
  width: 100%;
  background: #e9eef1;
}

.card .t {
  padding: 14px 16px 18px;
}

.card h3 {
  margin: 0 0 4px;
  font-size: 18px;
}

.card p {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
}

.prose {
  max-width: 800px;
  margin: 0 auto;
}

.prose h2 {
  margin: 36px 0 10px;
  font-size: 26px;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose p {
  margin: 0 0 14px;
}

.prose ul,
.prose ol {
  margin: 0 0 16px;
  padding-left: 24px;
}

.prose li {
  margin: 4px 0;
}

.prose code {
  background: #e9eef1;
  padding: 1px 6px;
  font-size: 15px;
}

.square {
  display: block;
  width: 100%;
  max-width: 420px;
  margin: 24px auto;
  border: 1px solid var(--line);
}

.form {
  display: grid;
  gap: 12px;
  max-width: 520px;
}

.center .form {
  margin: 0 auto;
}

.form input,
.form textarea {
  width: 100%;
  font: inherit;
  padding: 12px 14px;
  border: 1px solid #3a444d;
  background: #fff;
  color: var(--ink);
}

.thanks {
  display: none;
  margin-top: 12px;
  font-weight: 700;
  color: var(--teal);
}

.foot {
  background: var(--dark);
  color: #b4c0c8;
  font-size: 15px;
}

.foot .in {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  padding-top: 44px;
  padding-bottom: 24px;
}

.foot h2 {
  margin: 0 0 12px;
  font-size: 20px;
  color: #fff;
}

.foot p {
  margin: 0 0 10px;
}

.foot a {
  color: #7fdadd;
}

.foot ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.foot li {
  margin: 4px 0;
}

.foot .cp {
  grid-column: 1 / -1;
  border-top: 1px solid #2b343b;
  padding-top: 16px;
  font-size: 14px;
  color: #7f8c96;
}

@media (max-width: 800px) {
  body {
    font-size: 16px;
  }

  .top .in {
    flex-wrap: wrap;
    padding-top: 8px;
    padding-bottom: 8px;
  }

  .menu-btn {
    display: block;
  }

  .menu {
    display: none;
    flex-direction: column;
    width: 100%;
  }

  .menu.open {
    display: flex;
  }

  .hero {
    padding-top: 36px;
  }

  .hero .in {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 30px;
  }

  .hero-text {
    padding-bottom: 8px;
  }

  .btn-ghost {
    margin: 10px 0 0;
  }

  .small-hero h1 {
    font-size: 28px;
  }

  .section {
    padding: 40px 0;
  }

  .feature {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .feature.rev .feature-text {
    order: 0;
  }

  .cards,
  .cards.three {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }

  .foot .in {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

@media (max-width: 480px) {
  .cards,
  .cards.three {
    grid-template-columns: 1fr;
  }
}