:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --border: #d1d5db;
  --brand: #0f766e;
  --brand-dark: #115e59;
  --focus: #b45309;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 8px 24px rgba(17, 24, 39, 0.08);
  --maxw: 1100px;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

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

a {
  color: var(--brand-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: #fff;
  padding: var(--space-2) var(--space-3);
  z-index: 999;
}

.skip-link:focus {
  left: var(--space-3);
  top: var(--space-3);
}

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

.narrow {
  max-width: 760px;
}

.top-notice {
  text-align: center;
  font-size: 0.9rem;
  padding: var(--space-1) var(--space-3);
  background: #ecfeff;
  color: #134e4a;
  border-bottom: 1px solid #c7d2fe;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--border);
}

@supports ((-webkit-backdrop-filter: blur(6px)) or (backdrop-filter: blur(6px))) {
  .site-header {
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
  }
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: var(--space-3);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text);
  font-weight: 700;
  font-size: 1.1rem;
}

.brand:hover {
  text-decoration: none;
}

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--space-3);
}

.main-nav a {
  color: var(--text);
  font-weight: 600;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

.main-nav a[aria-current="page"] {
  background: #e0f2f1;
}

.menu-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  cursor: pointer;
}

.menu-toggle span {
  width: 20px;
  height: 2px;
  background: var(--text);
  margin: 0 auto;
}

.hero {
  padding: var(--space-6) 0 var(--space-5);
  background: linear-gradient(180deg, #ecfeff 0%, #f7f8fa 100%);
}

.hero h1 {
  line-height: 1.2;
  margin: 0 0 var(--space-3);
  font-size: clamp(1.7rem, 5vw, 2.4rem);
}

.hero p {
  margin: 0 0 var(--space-4);
  color: var(--muted);
}

.btn {
  display: inline-block;
  border-radius: 999px;
  padding: 0.72rem 1.2rem;
  font-weight: 700;
  border: 1px solid transparent;
  text-align: center;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
}

.btn-primary:hover {
  background: var(--brand-dark);
  text-decoration: none;
}

.btn-lg {
  padding: 0.9rem 1.4rem;
  font-size: 1.05rem;
}

.section {
  padding: var(--space-6) 0;
}

.section.alt {
  background: #eef2f7;
}

.section h2 {
  margin-top: 0;
  margin-bottom: var(--space-4);
  font-size: clamp(1.35rem, 4vw, 1.9rem);
}

.grid {
  display: grid;
  gap: var(--space-3);
}

.grid-2,
.grid-3 {
  grid-template-columns: 1fr;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: var(--space-4);
}

.card h3 {
  margin-top: 0;
  margin-bottom: var(--space-2);
  font-size: 1.1rem;
}

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

.icon {
  color: var(--brand-dark);
  margin-bottom: var(--space-2);
}

.check-list {
  margin: 0;
  padding-left: 1.1rem;
}

.check-list li {
  margin-bottom: var(--space-1);
}

.note-box h2 {
  margin-bottom: var(--space-2);
}

.note-box p + p {
  margin-top: var(--space-2);
}

.cta-band {
  text-align: center;
  background: linear-gradient(180deg, #f0fdfa 0%, #ecfeff 100%);
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #fff;
  padding: var(--space-4) 0;
}

.footer-inner {
  display: grid;
  gap: var(--space-3);
}

.site-footer ul {
  list-style: none;
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
}

.disclaimer {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

body.menu-open {
  overflow: hidden;
}

@media (max-width: 767px) {
  .site-header {
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .main-nav {
    position: fixed;
    top: 68px;
    right: 0;
    width: min(84vw, 320px);
    height: calc(100vh - 68px);
    background: #fff;
    border-left: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform 0.2s ease;
    padding: var(--space-4);
  }

  .main-nav ul {
    flex-direction: column;
    gap: var(--space-2);
  }

  .main-nav.is-open {
    transform: translateX(0);
  }
}

@media (min-width: 768px) {
  .menu-toggle {
    display: none;
  }

  .main-nav {
    position: static;
    width: auto;
    height: auto;
    transform: none;
    border: 0;
    background: transparent;
    padding: 0;
  }

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

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}