:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --text-dim: #6e6e73;
  --border: #e5e5e7;
  --accent: #1a8f6b;
  --max: 720px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

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

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

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.site-header { border-bottom: 1px solid var(--border); }
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand img { width: 26px; height: 26px; border-radius: 7px; }
.nav-link { color: var(--text-dim); font-size: 14px; }

/* ===== Hero ===== */
.hero { text-align: center; padding: 80px 0 64px; }
.hero img.app-icon {
  width: 88px; height: 88px; border-radius: 20px;
  border: 1px solid var(--border);
  margin-bottom: 28px;
}
.hero h1 {
  font-size: clamp(28px, 6vw, 40px);
  font-weight: 700; letter-spacing: -0.02em; line-height: 1.3;
  margin-bottom: 16px;
}
.hero .tagline {
  font-size: clamp(15px, 3.5vw, 18px);
  color: var(--text-dim);
  max-width: 540px; margin: 0 auto;
}
.hero .cta-note { display: block; margin-top: 24px; font-size: 13px; color: var(--text-dim); }

/* ===== Features ===== */
.section { padding: 56px 0; border-top: 1px solid var(--border); }
.section h2 {
  font-size: 22px; font-weight: 700; margin-bottom: 32px; text-align: center;
}
.feature-list { display: flex; flex-direction: column; gap: 28px; }
.feature {
  display: flex; gap: 16px; align-items: flex-start;
}
.feature .ico { flex-shrink: 0; width: 24px; height: 24px; color: var(--accent); margin-top: 3px; }
.feature .ico svg { width: 100%; height: 100%; display: block; }
.feature h3 { font-size: 16px; font-weight: 600; margin-bottom: 2px; }
.feature p { font-size: 14px; color: var(--text-dim); }

/* ===== Privacy note ===== */
.privacy-note { text-align: center; }
.privacy-note p {
  color: var(--text-dim); font-size: 15px;
  max-width: 540px; margin: 0 auto 16px;
}

/* ===== Footer ===== */
.site-footer {
  padding: 32px 0; text-align: center;
  color: var(--text-dim); font-size: 13px;
  border-top: 1px solid var(--border);
}
.site-footer .links { margin-bottom: 10px; display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.site-footer .links a { color: var(--text-dim); }

/* ===== Legal page ===== */
.legal { padding: 48px 0 72px; }
.legal h1 { font-size: 26px; font-weight: 700; margin-bottom: 6px; }
.legal .updated { color: var(--text-dim); font-size: 13px; margin-bottom: 32px; }
.legal h2 { font-size: 17px; font-weight: 600; margin: 30px 0 10px; }
.legal p, .legal li { color: var(--text-dim); font-size: 15px; }
.legal ul { padding-left: 22px; margin: 10px 0; }
.legal li { margin-bottom: 6px; }
.legal a.back { display: inline-block; margin-bottom: 24px; font-size: 14px; }
.legal strong { color: var(--text); font-weight: 600; }