/* Legal document + center — clean product-terms layout */
:root {
  --ink: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #0f766e;
  --accent-soft: #ecfdf5;
  --bg: #f3f4f6;
  --card: #ffffff;
  --font: "IBM Plex Sans", "Noto Sans TC", "PingFang TC", "Helvetica Neue", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}

/* —— Legal center shell —— */
.center-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.center-top {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: 0.85rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.25rem;
  position: sticky;
  top: 0;
  z-index: 20;
}
.brand-line {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
}
.brand-line strong {
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}
.brand-line span { color: var(--muted); font-size: 0.85rem; }
.nav-links { display: flex; gap: 1rem; font-size: 0.88rem; }
.nav-links a { color: var(--accent); text-decoration: none; font-weight: 500; }
.nav-links a:hover { text-decoration: underline; }

/* Language switcher — clean underline tabs */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
}
.lang-switch .lang-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.lang-seg {
  display: inline-flex;
  align-items: stretch;
  gap: 0;
  border-bottom: 1px solid var(--line);
}
.lang-seg button {
  appearance: none;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  background: transparent;
  color: #9ca3af;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  line-height: 1.2;
  letter-spacing: 0.01em;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.lang-seg button:hover { color: var(--ink); }
.lang-seg button.is-on {
  color: var(--ink);
  font-weight: 600;
  border-bottom-color: var(--accent);
}

.center-main {
  flex: 1;
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 1.25rem;
}
.doc-host {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  min-height: calc(100vh - 7rem);
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.04);
}
.doc-host .hint-load {
  margin: 0;
  padding: 2.5rem 1.5rem;
  color: var(--muted);
  text-align: center;
}
.doc-host > .doc-page {
  min-height: calc(100vh - 7rem);
}
.err-box {
  margin: 1rem 0 0;
  padding: 1rem 1.15rem;
  border-radius: 10px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
}
.err-box a { color: #991b1b; font-weight: 600; }

/* —— Document page (loaded in iframe / modal) —— */
body.doc-page {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 0;
  background: #fff;
  min-height: 100vh;
}
@media (max-width: 860px) {
  body.doc-page { grid-template-columns: 1fr; }
  .toc { position: static !important; border-right: 0; border-bottom: 1px solid var(--line); max-height: none; }
}
.toc {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow: auto;
  padding: 1.25rem 1rem;
  border-right: 1px solid var(--line);
  background: #fafafa;
}
.toc-title {
  margin: 0 0 0.75rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.toc nav { display: grid; gap: 0.35rem; }
.toc a {
  display: block;
  color: #374151;
  text-decoration: none;
  font-size: 0.82rem;
  line-height: 1.35;
  padding: 0.35rem 0.45rem;
  border-radius: 6px;
}
.toc a:hover { background: var(--accent-soft); color: var(--accent); }

.doc { padding: 1.75rem 1.75rem 3rem; max-width: 820px; }
.doc-header { margin-bottom: 1.75rem; padding-bottom: 1.25rem; border-bottom: 1px solid var(--line); }
.doc-kicker {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}
.doc h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.45rem, 3vw, 1.85rem);
  letter-spacing: -0.03em;
  line-height: 1.25;
}
.doc-meta { margin: 0; color: var(--muted); font-size: 0.86rem; }
.doc section { margin: 0 0 1.75rem; scroll-margin-top: 1rem; }
.doc section.notice-box {
  padding: 1rem 1.1rem;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 10px;
}
.doc section.notice-box h2 {
  background: transparent;
  border-left: 0;
  padding: 0;
  margin: 0 0 0.65rem;
  color: #92400e;
  font-size: 1.05rem;
}
.doc section.notice-box p { color: #78350f; }
.doc h2 {
  margin: 0 0 0.85rem;
  font-size: 1.2rem;
  padding: 0.55rem 0.75rem;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  color: #115e59;
}
.doc h3 {
  margin: 1.15rem 0 0.45rem;
  font-size: 1rem;
  color: #111827;
}
.doc p, .doc li {
  margin: 0 0 0.55rem;
  font-size: 0.92rem;
  color: #1f2937;
}
.doc ul { margin: 0.35rem 0 0.75rem; padding-left: 1.25rem; }
.doc-end {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--line);
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
}