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

body {
  background: var(--c-white);
  color: var(--c-zinc-950);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
}

a {
  text-decoration: none;
  color: inherit;
}

/* ── Header ── */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-zinc-200);
  padding: 0 32px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.header-logo {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-zinc-950);
  letter-spacing: -0.02em;
}
.header-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}
.header-nav a {
  font-size: 13px;
  color: var(--c-zinc-500);
  transition: color 0.15s;
}
.header-nav a:hover {
  color: var(--c-zinc-950);
}

/* ── Container ── */
.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 56px 32px 80px;
}

.page-label {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-zinc-400);
  font-weight: 600;
  margin-bottom: 12px;
}
.page-title {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--c-zinc-950);
  margin-bottom: 32px;
}

/* ── Tabs ── */
.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--c-zinc-200);
  margin-bottom: 32px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.tab {
  flex: 0 0 auto;
  padding: 12px 18px;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-zinc-500);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition:
    color 0.15s,
    border-color 0.15s;
  white-space: nowrap;
  font-family: inherit;
  margin-bottom: -1px;
}
.tab:hover {
  color: var(--c-zinc-950);
}
.tab.active {
  color: var(--c-zinc-950);
  border-bottom-color: var(--c-zinc-950);
}

/* ── Panels ── */
.panel {
  display: none;
}
.panel.active {
  display: block;
}

.panel h2 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--c-zinc-950);
  margin: 32px 0 12px;
}
.panel h2:first-child {
  margin-top: 0;
}
.panel h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-zinc-950);
  margin: 20px 0 8px;
}
.panel p {
  font-size: 14px;
  color: var(--c-zinc-700);
  margin-bottom: 12px;
}
.panel ul,
.panel ol {
  font-size: 14px;
  color: var(--c-zinc-700);
  padding-left: 22px;
  margin-bottom: 12px;
}
.panel li {
  margin-bottom: 6px;
}
.panel strong {
  color: var(--c-zinc-950);
  font-weight: 700;
}

.meta {
  font-size: 12px;
  color: var(--c-zinc-400);
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--c-zinc-100);
}

/* ── Spec table (特商法) ── */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin-top: 4px;
}
.spec-table th,
.spec-table td {
  text-align: left;
  vertical-align: top;
  padding: 12px 14px;
  border-bottom: 1px solid var(--c-zinc-100);
}
.spec-table th {
  width: 32%;
  font-weight: 600;
  color: var(--c-zinc-950);
  background: var(--c-zinc-50);
}
.spec-table td {
  color: var(--c-zinc-700);
}

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--c-zinc-200);
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer-logo {
  font-size: 13px;
  font-weight: 700;
  color: var(--c-zinc-950);
}
.footer-links {
  display: flex;
  gap: 20px;
}
.footer-links a {
  font-size: 12px;
  color: var(--c-zinc-400);
  transition: color 0.15s;
}
.footer-links a:hover {
  color: var(--c-zinc-950);
}
.footer-copy {
  font-size: 12px;
  color: var(--c-zinc-300);
}

@media (max-width: 640px) {
  .container {
    padding: 40px 20px 60px;
  }
  .page-title {
    font-size: 26px;
  }
  .footer {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  .footer-links {
    justify-content: center;
  }
  .spec-table th {
    width: 38%;
  }
}