:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-2: #eef6ff;
  --text: #0f172a;
  --muted: #475569;
  --border: #dbe4ee;
  --accent: #0f766e;
  --accent-dark: #0b5a54;
  --shadow: 0 10px 25px rgba(15, 23, 42, 0.06);
  --radius: 18px;
  --max: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
  line-height: 1.65;
}

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

a {
  color: var(--accent-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.12em;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(15, 118, 110, 0.2);
  outline-offset: 2px;
}

.container {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 0.85rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.brand span {
  font-size: 1.125rem;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  margin-left: auto;
  padding: 0.72rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

.nav-toggle-label {
  font-size: 0.95rem;
}

.nav-toggle-box {
  display: inline-flex;
  flex-direction: column;
  gap: 0.2rem;
}

.nav-toggle-box span {
  display: block;
  width: 1.1rem;
  height: 2px;
  border-radius: 999px;
  background: var(--text);
}

.main-nav {
  width: 100%;
  padding-top: 0.25rem;
}

.main-nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.main-nav a {
  display: flex;
  align-items: center;
  padding: 0.95rem 1rem;
  min-height: 52px;
  border-radius: 14px;
  text-decoration: none;
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  background: #fff;
  border: 1px solid var(--border);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--text);
  background: #f1f5f9;
}

.main-nav a.active {
  border-color: #bfd8f6;
  background: #eef6ff;
}

body.js-nav .main-nav {
  display: none;
}

body.js-nav .main-nav.is-open {
  display: block;
}

main {
  padding: 2rem 0 4rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.95fr);
  gap: 2rem;
  align-items: center;
  padding: 2rem 0 1rem;
}

.hero-visual {
  background: linear-gradient(180deg, #e7f8f5 0%, #f8fafc 100%);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 1rem;
  box-shadow: var(--shadow);
}

.eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-dark);
  background: #ddf7f1;
  border: 1px solid #bfe9de;
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  margin-bottom: 1rem;
}

h1, h2, h3 {
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 1rem;
}

h1 {
  font-size: clamp(2rem, 3vw, 3.1rem);
}

h2 {
  font-size: clamp(1.45rem, 2vw, 2rem);
}

h3 {
  font-size: 1.15rem;
}

p {
  margin: 0 0 1rem;
  color: var(--muted);
}

.lead {
  font-size: 1.08rem;
  max-width: 70ch;
}

.hero-actions,
.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.2rem;
}

.hero-points span {
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.95rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.15rem;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  border: 1px solid var(--accent);
}

.button:hover {
  background: var(--accent-dark);
  color: #fff;
}

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

.button-secondary:hover {
  background: #f8fafc;
  color: var(--text);
}

.section {
  margin-top: 2rem;
  padding: 1.5rem 0;
}

.section-highlight {
  padding: 0;
}

.card-grid,
.info-grid,
.faq-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card,
.info-box,
.faq-list article,
.notice,
.table-wrap,
.page-intro,
.article-header {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card {
  padding: 1.15rem;
}

.card h3 {
  margin-bottom: 0.6rem;
}

.card h3 a {
  text-decoration: none;
  color: var(--text);
}

.card h3 a:hover {
  color: var(--accent-dark);
}

.card p {
  margin-bottom: 0;
}

.card-tag {
  display: inline-block;
  margin-bottom: 0.8rem;
  padding: 0.3rem 0.6rem;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 999px;
  background: #eff6ff;
  color: #1d4ed8;
  border: 1px solid #bfdbfe;
}

.info-box,
.page-intro,
.article-header,
.notice {
  padding: 1.3rem;
}

.breadcrumb {
  margin-bottom: 1rem;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  padding: 0;
  margin: 0;
  list-style: none;
  color: var(--muted);
  font-size: 0.92rem;
}

.breadcrumb li:not(:last-child)::after {
  content: "›";
  margin-left: 0.55rem;
  color: #94a3b8;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

.breadcrumb .current {
  color: var(--text);
  font-weight: 600;
}

.checklist,
.number-list {
  padding-left: 1.2rem;
  margin: 0 0 1rem;
  color: var(--muted);
}

.checklist li,
.number-list li {
  margin-bottom: 0.5rem;
}

.table-wrap {
  padding: 0.5rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 520px;
}

th,
td {
  text-align: left;
  padding: 0.85rem 0.9rem;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
}

th {
  color: var(--text);
  font-size: 0.95rem;
}

.article .section {
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #fff;
  margin-top: 3rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr 1fr;
  gap: 1.5rem;
  padding: 2rem 0;
}

.footer-brand,
.footer-title {
  font-weight: 800;
  color: var(--text);
  margin-bottom: 0.7rem;
}

.footer-links {
  padding: 0;
  list-style: none;
  margin: 0;
}

.footer-links li + li {
  margin-top: 0.55rem;
}

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

.footer-bottom {
  padding: 1rem 0 2rem;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  margin: 0;
}

@media (min-width: 901px) {
  .header-inner {
    flex-wrap: nowrap;
    gap: 1rem;
    padding: 0.95rem 0;
  }

  .nav-toggle {
    display: none;
  }

  .main-nav {
    display: block !important;
    width: auto;
    padding-top: 0;
    margin-left: auto;
  }

  .main-nav ul {
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: flex-end;
    gap: 0.35rem;
  }

  .main-nav a {
    min-height: auto;
    padding: 0.58rem 0.82rem;
    border-radius: 999px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--muted);
    font-size: 0.93rem;
    white-space: nowrap;
  }

  .main-nav a:hover,
  .main-nav a.active {
    color: var(--text);
    background: #f1f5f9;
    border-color: var(--border);
  }

  .main-nav a.active {
    background: #eef6ff;
    border-color: #d5e7fb;
  }
}

@media (max-width: 900px) {
  .hero,
  .card-grid,
  .info-grid,
  .faq-list {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero {
    padding-top: 1rem;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(var(--max), calc(100% - 1rem));
  }

  main {
    padding-top: 1rem;
  }

  .button {
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
  }

  .page-intro,
  .article-header,
  .info-box,
  .card,
  .notice {
    padding: 1rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 2rem;
  }
}