/* ── Design tokens ── */
:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);

  --blue: #2563eb;
  --blue-light: #eff6ff;
  --blue-border: #bfdbfe;

  --green: #059669;
  --green-light: #ecfdf5;
  --green-border: #6ee7b7;
}

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

body {
  font-family: ui-sans-serif, system-ui, -apple-system, "Hiragino Kaku Gothic ProN",
               "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ── Header ── */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  max-width: 960px;
  margin: 0 auto;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.header-left { display: flex; align-items: center; gap: 10px; }

.logo-mark {
  width: 28px; height: 28px;
  background: var(--blue);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  text-decoration: none;
}
.logo-mark svg { display: block; }

.site-name {
  font-size: 15px; font-weight: 700;
  letter-spacing: .02em;
  color: var(--text);
  text-decoration: none;
}

nav { display: flex; align-items: center; gap: 4px; }
.nav-link {
  font-size: 13px; font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  padding: 5px 10px;
  border-radius: 6px;
  transition: background .15s, color .15s;
}
.nav-link:hover, .nav-link.active { background: var(--bg); color: var(--text); }
.nav-link.active { font-weight: 600; }

/* ── Main ── */
main {
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 56px 24px 80px;
  flex: 1;
}

/* ── Hero ── */
.hero { margin-bottom: 56px; }

.badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 11px; font-weight: 700;
  letter-spacing: .08em; text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 99px;
  margin-bottom: 20px;
}
.badge-blue { color: var(--blue); background: var(--blue-light); }
.badge-green { color: var(--green); background: var(--green-light); }

.hero h1 {
  font-size: clamp(26px, 4.5vw, 40px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.2;
  margin-bottom: 14px;
}
.hero p {
  font-size: 15px;
  color: var(--muted);
  max-width: 520px;
  line-height: 1.75;
}

/* ── Section label ── */
.section-label {
  font-size: 11px; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}

/* ── App grid ── */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(272px, 1fr));
  gap: 14px;
  margin-bottom: 56px;
}

.app-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  display: flex; flex-direction: column; gap: 12px;
  text-decoration: none; color: inherit;
  transition: box-shadow .18s, transform .18s, border-color .18s;
}
.app-card:hover {
  transform: translateY(-2px);
  border-color: var(--blue-border);
  box-shadow: 0 4px 8px rgba(0,0,0,.1), 0 12px 32px rgba(37,99,235,.12);
}

.app-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.app-icon-blue { background: var(--blue); }
.app-icon-green { background: var(--green); }

.app-name { font-size: 16px; font-weight: 700; margin-bottom: 5px; }
.app-desc { font-size: 13px; color: var(--muted); line-height: 1.6; }

.app-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.tag {
  font-size: 11px; font-weight: 600;
  padding: 2px 8px; border-radius: 99px;
}
.tag-blue { color: var(--blue); background: var(--blue-light); }
.tag-green { color: var(--green); background: var(--green-light); }

.arrow { color: var(--muted); font-size: 17px; transition: color .15s, transform .15s; }
.app-card:hover .arrow { color: var(--blue); transform: translateX(3px); }

/* ── Category cards (top page) ── */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
  margin-bottom: 56px;
}
.cat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  text-decoration: none; color: inherit;
  display: flex; flex-direction: column; gap: 14px;
  transition: box-shadow .18s, transform .18s, border-color .18s;
}
.cat-card:hover { transform: translateY(-2px); box-shadow: 0 4px 8px rgba(0,0,0,.1), 0 12px 32px rgba(0,0,0,.1); }
.cat-card-blue:hover { border-color: var(--blue-border); }
.cat-card-green:hover { border-color: var(--green-border); }

.cat-icon {
  width: 52px; height: 52px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
}
.cat-icon-blue { background: var(--blue); }
.cat-icon-green { background: var(--green); }

.cat-name { font-size: 20px; font-weight: 800; letter-spacing: -.01em; }
.cat-desc { font-size: 13px; color: var(--muted); line-height: 1.7; flex: 1; }
.cat-action {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13px; font-weight: 600;
}
.cat-action-blue { color: var(--blue); }
.cat-action-green { color: var(--green); }

/* ── Notice ── */
.notice {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
}
.notice-title { font-size: 13px; font-weight: 700; margin-bottom: 10px; }
.notice ul { padding-left: 18px; font-size: 13px; color: var(--muted); line-height: 1.9; }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 20px 24px;
}
.footer-inner {
  max-width: 960px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap;
  font-size: 12px; color: var(--muted);
}
.footer-inner a { color: inherit; }

@media (max-width: 600px) {
  main { padding: 40px 16px 60px; }
  .hero { margin-bottom: 40px; }
  nav .nav-link span { display: none; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 6px; }
}