:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #16202e;
  --muted: #5b6675;
  --accent: #1e6bff;
  --accent-2: #0b3fb0;
  --border: #e4e9f2;
  --radius: 16px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --card: #121a2b;
    --text: #eaf0fb;
    --muted: #9aa7bd;
    --accent: #4d8bff;
    --accent-2: #7aa8ff;
    --border: #22304a;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Noto Sans JP", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 760px; margin: 0 auto; padding: 24px; }
header.site {
  display: flex; align-items: center; gap: 14px;
  padding: 20px 24px; max-width: 760px; margin: 0 auto;
}
header.site img { width: 44px; height: 44px; border-radius: 10px; }
header.site .name { font-weight: 700; font-size: 18px; }
header.site nav { margin-left: auto; display: flex; align-items: center; gap: 18px; font-size: 15px; }
.lang-switch {
  font: inherit; font-size: 14px; color: var(--text);
  background: var(--card); border: 1px solid var(--border);
  border-radius: 8px; padding: 4px 8px; cursor: pointer;
  max-width: 44vw;
}
/* スマホ: ロゴ＋名前を1段目、ナビは2段目に回して折り返す */
@media (max-width: 560px) {
  header.site { flex-wrap: wrap; padding: 16px; row-gap: 12px; }
  header.site .name { flex: 1 1 auto; }
  header.site nav {
    width: 100%; margin-left: 0;
    flex-wrap: wrap; gap: 10px 16px; font-size: 14px;
  }
  header.site nav .lang-switch { margin-left: auto; }
}

.hero {
  text-align: center;
  padding: 40px 24px 8px;
}
.hero img.appicon {
  width: 120px; height: 120px; border-radius: 27px;
  box-shadow: 0 10px 30px rgba(20,50,120,.25);
}
.hero h1 { font-size: 34px; margin: 18px 0 6px; letter-spacing: -0.02em; }
.hero p.tagline { font-size: 18px; color: var(--muted); margin: 0 auto; max-width: 34em; }
.hero .availability { font-size: 13px; color: var(--muted); margin: 14px 0 0; }

/* App Store バッジ（Apple公式SVG・言語別／ライト時は黒・ダーク時は白） */
.appstore-badge { display: inline-block; margin: 22px auto 0; line-height: 0; transition: transform .12s ease; }
.appstore-badge:hover { transform: translateY(-1px); text-decoration: none; }
.appstore-badge .badge-img { height: 54px; width: auto; display: block; }
.appstore-badge .badge-dark { display: none; }
@media (prefers-color-scheme: dark) {
  .appstore-badge .badge-light { display: none; }
  .appstore-badge .badge-dark { display: block; }
}

/* 対応フォーマット帯 */
.formats {
  display: flex; flex-wrap: wrap; justify-content: center; align-items: center;
  gap: 6px 14px; max-width: 760px; margin: 26px auto 8px; padding: 0 24px;
  font-weight: 700; letter-spacing: .02em; color: var(--text);
}
.formats span { font-size: 15px; }
.formats i { color: var(--accent); font-style: normal; }

/* 使い方 3ステップ */
.steps-section { margin: 12px 0; }
.steps-section h2 { text-align: center; }
.steps {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 18px;
}
@media (max-width: 560px) { .steps { grid-template-columns: 1fr; } }
.step {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 18px; text-align: center;
}
.step-n {
  width: 34px; height: 34px; margin: 0 auto 10px; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.step h3 { margin: 0 0 4px; font-size: 16px; }
.step p { margin: 0; color: var(--muted); font-size: 14px; }

/* プライバシー訴求＋CTA */
.privacy-cta { text-align: center; padding: 8px 0 8px; }
.privacy-cta h2 { margin: 0 0 8px; }
.privacy-cta p { color: var(--muted); margin: 0 auto; max-width: 34em; }

.features {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px;
  max-width: 760px; margin: 28px auto; padding: 0 24px;
}
@media (max-width: 560px) { .features { grid-template-columns: 1fr; } }
.feature {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px 18px;
}
.feature h3 { margin: 0 0 4px; font-size: 16px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }

.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px 28px; margin: 18px 0;
}
h2 { font-size: 22px; margin: 28px 0 10px; letter-spacing: -0.01em; }
h2:first-child { margin-top: 0; }
.lang-label {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 6px;
}
.muted { color: var(--muted); }

/* Contact form */
.contact-form { display: flex; flex-direction: column; gap: 4px; }
.contact-form label { font-weight: 600; font-size: 14px; margin-top: 12px; }
.contact-form input, .contact-form select, .contact-form textarea {
  font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; width: 100%;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(30,107,255,.15);
}
.contact-form textarea { resize: vertical; min-height: 120px; }
.contact-form button {
  margin-top: 18px; align-self: flex-start;
  background: var(--accent); color: #fff; border: none;
  border-radius: 10px; padding: 11px 22px; font: inherit; font-weight: 600; cursor: pointer;
}
.contact-form button:hover { background: var(--accent-2); }
.contact-form button:disabled { opacity: .6; cursor: default; }
.cf-hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.cf-status { min-height: 1.4em; margin: 14px 0 0; font-size: 14px; font-weight: 600; }
.cf-status.err { color: #d1453b; }
.cf-status.ok { color: #1e8e3e; }
.cf-status.info { color: var(--muted); font-weight: 400; }
.cf-note { font-size: 12px; margin: 12px 0 0; }
hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }
footer.site {
  text-align: center; color: var(--muted); font-size: 13px;
  padding: 32px 24px; border-top: 1px solid var(--border); margin-top: 40px;
}
footer.site a { color: var(--muted); }