:root {
  color-scheme: light;
  --ink: #172026;
  --muted: #5e6a71;
  --line: #d6dde1;
  --panel: #ffffff;
  --soft: #eef3f4;
  --teal: #0b7d82;
  --teal-dark: #075b5f;
  --amber: #f1aa2b;
  --shadow: 0 18px 46px rgba(23, 32, 38, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #f7faf9;
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 32px;
  color: #fff;
  background: rgba(11, 20, 24, 0.62);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.brand,
.nav {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 700;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  color: #102024;
  background: var(--amber);
  border-radius: 7px;
}

.nav {
  gap: 20px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 14px;
}

.hero {
  position: relative;
  min-height: 84vh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  padding: 112px 32px 58px;
  background: #10191d;
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-shade {
  position: absolute;
  inset: 0;
  background: rgba(7, 14, 17, 0.56);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(780px, 100%);
  color: #fff;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--amber);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 16px;
  font-size: clamp(42px, 7vw, 86px);
  line-height: 0.95;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 620px;
  margin-bottom: 28px;
  color: rgba(255, 255, 255, 0.88);
  font-size: 19px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 8px;
  font-weight: 800;
  box-shadow: var(--shadow);
}

.button.primary {
  color: #072124;
  background: var(--amber);
}

.button.secondary {
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.32);
  box-shadow: none;
}

.quick-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
}

.quick-facts div {
  min-width: 134px;
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.12);
  border-radius: 8px;
}

.quick-facts dt {
  color: rgba(255, 255, 255, 0.66);
  font-size: 12px;
}

.quick-facts dd {
  margin: 4px 0 0;
  font-weight: 800;
}

.summary-band {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border-bottom: 1px solid var(--line);
}

.summary-item {
  display: grid;
  gap: 6px;
  min-height: 112px;
  padding: 28px 32px;
  background: var(--panel);
}

.summary-item strong {
  font-size: 18px;
}

.summary-item span {
  color: var(--muted);
  line-height: 1.6;
}

.section {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  padding: 76px 0;
}

.section-heading {
  max-width: 680px;
  margin-bottom: 26px;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.08;
  letter-spacing: 0;
}

.section p {
  color: var(--muted);
  line-height: 1.75;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.steps article,
.notes {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 26px rgba(23, 32, 38, 0.07);
}

.steps article {
  min-height: 218px;
  padding: 24px;
}

.step-number {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 26px;
  color: #fff;
  background: var(--teal);
  border-radius: 8px;
  font-weight: 800;
}

h3 {
  margin-bottom: 10px;
  font-size: 22px;
  letter-spacing: 0;
}

code {
  padding: 2px 6px;
  background: var(--soft);
  border-radius: 5px;
  color: var(--teal-dark);
  font-family: Consolas, "Cascadia Mono", monospace;
}

.split-section {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: 40px;
  align-items: start;
  border-top: 1px solid var(--line);
}

.notes {
  padding: 22px 24px;
}

.notes p {
  margin-bottom: 14px;
}

.notes p:last-child {
  margin-bottom: 0;
}

@media (max-width: 780px) {
  .topbar {
    padding: 0 18px;
  }

  .nav {
    display: none;
  }

  .hero {
    min-height: 86vh;
    padding: 96px 20px 34px;
  }

  .hero-copy {
    font-size: 16px;
  }

  .button {
    width: 100%;
  }

  .quick-facts,
  .summary-band,
  .steps,
  .split-section {
    grid-template-columns: 1fr;
  }

  .summary-band {
    display: grid;
  }

  .summary-item {
    min-height: auto;
    padding: 22px 24px;
  }

  .section {
    width: min(100% - 32px, 1120px);
    padding: 54px 0;
  }
}