/* Kobanio — 和紙 (washi) theme. Light, calm, generous 間 (ma) spacing.
   Palette: washi paper · sumi-black text · koban gold · 藍 indigo · 朱 vermilion. */
:root {
  --paper: #f3eee2;       /* page background — warm washi */
  --paper-2: #fbf9f3;     /* raised surfaces (cards) */
  --sumi: #20201c;        /* primary text — sumi black */
  --muted: #6f675a;       /* secondary text */
  --hair: #e4ddcc;        /* hairline borders */
  --gold: #c2a14d;        /* koban gold — fills & borders */
  --gold-deep: #9a7b1f;   /* gold for text on light (readable) */
  --indigo: #214a6e;      /* 藍 — secondary actions */
  --vermilion: #c5462f;   /* 朱 — sparing emphasis */
  --line-green: #06c755;  /* LINE brand (locked) */
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Noto Sans JP", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: linear-gradient(180deg, #f6f2e9 0%, #efe8d8 100%) fixed, var(--paper);
  color: var(--sumi);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 960px; margin: 0 auto; padding: 24px; }
header { padding: 28px 0 12px; }
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.brand { font-size: 26px; font-weight: 800; letter-spacing: 0.01em; color: var(--sumi); }
.brand .coin { color: var(--gold); }
.nav { display: flex; gap: 22px; align-items: center; flex-wrap: wrap; }
.nav > a { color: var(--muted); text-decoration: none; font-size: 14px; }
.nav > a:hover { color: var(--sumi); }

/* 言語ドロップダウン — no-JS <details> menu */
.langmenu { position: relative; }
.langmenu summary {
  list-style: none; cursor: pointer;
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 14px; color: var(--sumi);
  border: 1px solid var(--hair); border-radius: 999px;
  padding: 7px 14px; background: var(--paper-2);
  user-select: none;
}
.langmenu summary::-webkit-details-marker { display: none; }
.langmenu summary::after { content: "▾"; font-size: 11px; color: var(--muted); }
.langmenu[open] summary { border-color: var(--gold); }
.langmenu ul {
  position: absolute; right: 0; top: calc(100% + 8px);
  margin: 0; padding: 6px; list-style: none;
  background: var(--paper-2); border: 1px solid var(--hair);
  border-radius: 14px; box-shadow: 0 10px 30px rgba(32,32,28,.14);
  min-width: 168px; z-index: 30;
}
.langmenu li { margin: 0; }
.langmenu li a {
  display: block; padding: 10px 14px; border-radius: 9px;
  text-decoration: none; color: var(--sumi); font-size: 14px;
}
.langmenu li a:hover { background: rgba(194,161,77,.14); }
.langmenu li a[aria-current="page"] { color: var(--gold-deep); font-weight: 700; }

.hero { padding: 88px 0 72px; text-align: left; }
.hero h1 {
  font-size: clamp(34px, 5.6vw, 60px);
  line-height: 1.25;
  margin: 0 0 22px;
  font-weight: 800;
  letter-spacing: 0.01em;
}
.hero h1 .accent {
  color: var(--gold-deep);
  box-shadow: inset 0 -0.5em 0 rgba(194,161,77,.22);
}
.hero p.sub {
  font-size: clamp(17px, 2.2vw, 21px);
  color: var(--muted);
  max-width: 640px;
  margin: 0 0 34px;
}
.cta-row { display: flex; gap: 16px; flex-wrap: wrap; align-items: center; }
.cta {
  display: inline-block;
  background: var(--line-green);
  color: #fff;
  text-decoration: none;
  padding: 15px 30px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 16px;
  box-shadow: 0 2px 10px rgba(6,199,85,.22);
}
.cta-secondary {
  background: transparent;
  color: var(--indigo);
  border: 1px solid var(--indigo);
  box-shadow: none;
}

section { padding: 64px 0; border-top: 1px solid var(--hair); }
section h2 {
  font-size: clamp(24px, 3.6vw, 34px);
  margin: 0 0 14px;
  letter-spacing: 0.01em;
}
section p.lede { color: var(--muted); margin: 0 0 36px; max-width: 720px; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.feature {
  background: var(--paper-2);
  border: 1px solid var(--hair);
  border-radius: 14px;
  padding: 26px;
  box-shadow: 0 1px 3px rgba(32,32,28,.04);
}
.feature .ico { font-size: 30px; margin-bottom: 12px; }
.feature h3 { font-size: 17px; margin: 0 0 8px; color: var(--sumi); }
.feature p { color: var(--muted); font-size: 14px; margin: 0; }

.flow {
  background: var(--paper-2);
  border: 1px solid var(--hair);
  border-radius: 18px;
  padding: 36px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px;
  margin: 24px 0;
}
.step { text-align: center; }
.step .num {
  display: inline-block;
  width: 40px; height: 40px; line-height: 40px;
  background: var(--gold);
  color: #fff;
  border-radius: 50%;
  font-weight: 800;
  margin-bottom: 14px;
}
.step h4 { margin: 0 0 6px; font-size: 16px; }
.step p { margin: 0; color: var(--muted); font-size: 13px; }

.pricing { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; }
.tier {
  background: var(--paper-2);
  border-radius: 14px;
  padding: 26px;
  border: 1px solid var(--hair);
  box-shadow: 0 1px 3px rgba(32,32,28,.04);
}
.tier.featured {
  border-color: var(--gold);
  background: linear-gradient(180deg, rgba(194,161,77,.08), var(--paper-2));
}
.tier h3 { margin: 0 0 4px; font-size: 18px; }
.tier .price { font-size: 32px; font-weight: 800; margin: 8px 0 4px; color: var(--sumi); }
.tier .price .suffix { font-size: 14px; color: var(--muted); font-weight: 400; }
.tier .tagline { color: var(--muted); font-size: 13px; margin: 0; }
.tier ul { padding-left: 20px; margin: 16px 0 0; font-size: 13px; color: var(--muted); }
.tier li { margin: 5px 0; }
.badge {
  display: inline-block; background: var(--vermilion); color: #fff;
  font-size: 11px; padding: 2px 9px; border-radius: 4px;
  font-weight: 700; vertical-align: middle; margin-left: 6px; letter-spacing: .04em;
}

footer { padding: 56px 0; color: var(--muted); font-size: 13px; border-top: 1px solid var(--hair); }
footer a { color: var(--indigo); text-decoration: underline; }
footer strong { color: var(--sumi); }
.disclaimer { margin-top: 16px; font-size: 12px; line-height: 1.8; }

/* ── Mobile-first: tighten spacing, simplify header ─────────────────────── */
@media (max-width: 640px) {
  .container { padding: 18px; }
  header { padding: 18px 0 6px; }
  .topbar { gap: 10px; }
  .brand { font-size: 22px; }
  /* keep the header clean on phones: brand + language dropdown only */
  .nav { gap: 12px; margin-left: auto; }
  .nav > a { display: none; }
  .langmenu summary { padding: 8px 14px; }

  .hero { padding: 40px 0 36px; }
  .hero h1 { font-size: clamp(28px, 8vw, 38px); line-height: 1.35; margin: 0 0 16px; }
  .hero p.sub { font-size: 16px; margin: 0 0 26px; }
  .cta-row { gap: 12px; }
  .cta { width: 100%; text-align: center; padding: 16px 20px; }

  section { padding: 40px 0; }
  .features, .pricing { gap: 14px; }
  .feature, .tier { padding: 20px; }
  .flow { padding: 24px 20px; gap: 20px; }
}