:root {
  --bg: #fafaf9;
  --surface: #ffffff;
  --ink: #18181b;
  --muted: #71717a;
  --border: #e4e4e7;
  --accent: #0ea5e9;
  --accent-soft: #e0f2fe;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans JP", "Hiragino Sans", sans-serif;
  line-height: 1.75;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

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

a:hover,
a:focus-visible {
  text-decoration: underline;
}

/* --- header --- */

.site-header {
  padding: 28px 0;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  font-weight: 700;
  font-size: 20px;
  color: var(--ink);
}

.brand img {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: block;
}

.site-header nav a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

/* --- hero --- */

.hero {
  padding: 64px 0 56px;
  text-align: center;
}

.hero h1 {
  font-family: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  font-weight: 700;
  font-size: clamp(28px, 6vw, 44px);
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  text-wrap: balance;
}

.hero p.lede {
  color: var(--muted);
  font-size: clamp(15px, 2.6vw, 17px);
  max-width: 480px;
  margin: 0 auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 28px;
  padding: 9px 18px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #0369a1;
  font-size: 13px;
  font-weight: 700;
}

.badge svg {
  width: 14px;
  height: 14px;
}

/* --- features --- */

.features {
  padding: 8px 0 56px;
  display: grid;
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
}

.feature {
  background: var(--surface);
  padding: 26px 28px;
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 18px;
  align-items: start;
}

.feature .num {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: var(--ink);
  color: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  font-family: "Zen Kaku Gothic New", sans-serif;
}

.feature h2 {
  font-family: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  font-size: 17px;
  font-weight: 700;
  margin: 2px 0 6px;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
}

/* --- footer --- */

.site-footer {
  padding: 32px 0 48px;
  border-top: 1px solid var(--border);
  margin-top: 12px;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 13px;
}

.site-footer a {
  color: var(--muted);
  font-weight: 600;
}

/* --- privacy page --- */

.doc {
  padding: 48px 0 64px;
}

.doc h1 {
  font-family: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  font-size: clamp(24px, 5vw, 30px);
  margin: 0 0 6px;
}

.doc .updated {
  color: var(--muted);
  font-size: 13px;
  margin: 0 0 28px;
}

.doc .intro {
  color: var(--muted);
  margin-bottom: 32px;
}

.doc section {
  margin-bottom: 26px;
}

.doc section h2 {
  font-family: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 8px;
}

.doc section p {
  margin: 0;
  color: var(--muted);
  white-space: pre-line;
}

.back-link {
  display: inline-block;
  margin-bottom: 24px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}

@media (max-width: 560px) {
  .feature {
    padding: 22px 20px;
  }
}