:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-alt: #eef3f7;
  --text: #1e293b;
  --muted: #526071;
  --line: #d8e1e8;
  --brand: #0f766e;
  --brand-dark: #115e59;
  --accent: #dcfce7;
  --warning-bg: #fff7ed;
  --warning-border: #fdba74;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Avenir Next", Avenir, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.08), transparent 32%),
    linear-gradient(180deg, #f9fbfc 0%, var(--bg) 100%);
  line-height: 1.6;
}

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

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

.site-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(249, 251, 252, 0.88);
  border-bottom: 1px solid rgba(216, 225, 232, 0.8);
}

.site-header .site-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 0;
}

.brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand);
}

.brand-name {
  font-size: 1.05rem;
  font-weight: 700;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.site-nav a {
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.95rem;
}

.site-nav a.active {
  background: var(--brand);
  border-color: var(--brand);
  color: #ffffff;
}

.hero {
  padding: 56px 0 28px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(260px, 0.8fr);
  gap: 24px;
  align-items: start;
}

.hero-card,
.meta-card,
.notice,
.step,
.footer-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 30px;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--brand-dark);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero-card h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1.05;
}

.hero-card p {
  margin: 0;
  max-width: 62ch;
  font-size: 1.05rem;
  color: var(--muted);
}

.meta-card {
  padding: 24px;
}

.meta-card h2 {
  margin: 0 0 16px;
  font-size: 1.1rem;
}

.meta-list {
  display: grid;
  gap: 14px;
}

.meta-list div {
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.meta-list div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.meta-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.meta-value {
  display: block;
  margin-top: 4px;
}

.meta-card .button {
  margin-top: 18px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--brand);
  color: #ffffff;
  text-decoration: none;
  font-weight: 700;
}

.button.secondary {
  background: var(--surface-alt);
  color: var(--text);
}

.main-content {
  padding-bottom: 56px;
}

.notice {
  padding: 20px 22px;
  margin-bottom: 26px;
  background: var(--warning-bg);
  border-color: var(--warning-border);
}

.notice h2 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.steps {
  display: grid;
  gap: 22px;
}

.step {
  overflow: hidden;
}

.step-body {
  padding: 24px;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface-alt);
  color: var(--brand-dark);
  font-weight: 800;
  margin-bottom: 14px;
}

.step h3 {
  margin: 0 0 10px;
  font-size: 1.25rem;
}

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

.step figure {
  margin: 20px 0 0;
}

.step figcaption {
  margin-top: 10px;
  font-size: 0.92rem;
  color: var(--muted);
}

.step img {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--surface-alt);
}

.footer {
  padding: 0 0 48px;
}

.footer-card {
  padding: 24px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
}

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

@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .site-header .site-shell,
  .footer-card {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .site-shell {
    width: min(100% - 20px, 1120px);
  }

  .hero {
    padding-top: 28px;
  }

  .hero-card,
  .meta-card,
  .notice,
  .step-body,
  .footer-card {
    padding: 18px;
  }

  .hero-card h1 {
    font-size: 2rem;
  }
}