:root {
  --brand: #00897b;
  --brand-dark: #00695c;
  --brand-light: #4db6ac;
  --bg: #ffffff;
  --bg-alt: #f4f7f6;
  --text: #1f2a28;
  --text-muted: #5b6b68;
  --border: #e0e6e4;
  --maxw: 880px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", Meiryo, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
}

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

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--brand-dark);
  text-decoration: none;
}

.brand .dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 4px solid var(--brand);
  display: inline-block;
}

.nav a {
  margin-left: 20px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
}

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

/* Hero */
.hero {
  background: linear-gradient(160deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #fff;
  padding: 72px 0 80px;
  text-align: center;
}

.hero h1 {
  font-size: 2.4rem;
  margin: 0 0 16px;
  line-height: 1.3;
}

.hero p {
  font-size: 1.15rem;
  max-width: 560px;
  margin: 0 auto 28px;
  opacity: 0.95;
}

.ring {
  width: 96px;
  height: 96px;
  margin: 0 auto 24px;
  border-radius: 50%;
  border: 8px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-right-color: #fff;
}

/* Sections */
section {
  padding: 64px 0;
}

section.alt {
  background: var(--bg-alt);
}

section h2 {
  font-size: 1.6rem;
  margin: 0 0 32px;
  text-align: center;
  color: var(--brand-dark);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  color: var(--brand-dark);
}

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

/* Plans */
.plans {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  max-width: 640px;
  margin: 0 auto;
}

.plan {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 24px;
  background: var(--bg);
}

.plan.premium {
  border-color: var(--brand);
  box-shadow: 0 8px 24px rgba(0, 137, 123, 0.12);
}

.plan h3 {
  margin: 0 0 12px;
  color: var(--brand-dark);
}

.plan ul {
  margin: 0;
  padding-left: 1.2em;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.site-footer a {
  margin: 0 10px;
  color: var(--text-muted);
}

/* Legal page */
.legal {
  padding: 48px 0 72px;
}

.legal h1 {
  color: var(--brand-dark);
  font-size: 1.9rem;
  margin-bottom: 4px;
}

.legal .updated {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 32px;
}

.legal h2 {
  font-size: 1.25rem;
  color: var(--brand-dark);
  margin-top: 40px;
  border-bottom: 2px solid var(--border);
  padding-bottom: 6px;
}

.legal h3 {
  font-size: 1.05rem;
  margin-top: 24px;
}

.legal table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.95rem;
}

.legal th,
.legal td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.legal th {
  background: var(--bg-alt);
}

.legal ul {
  padding-left: 1.3em;
}

@media (max-width: 600px) {
  .hero h1 {
    font-size: 1.9rem;
  }
  .nav a {
    margin-left: 14px;
  }
}