:root {
  --text: #1d1d1f;
  --text-dim: #6e6e73;
  --bg: #ffffff;
  --bg-soft: #f5f5f7;
  --accent: #0071e3;
  --border: #e5e5ea;
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "PingFang TC", "PingFang SC", "Hiragino Sans", "Noto Sans TC", "Noto Sans JP", "Noto Sans KR", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  margin: 0;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); }

/* Sticky simple header */
header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.nav-inner {
  max-width: 1024px; margin: 0 auto;
  padding: 12px 20px;
  display: flex; justify-content: space-between; align-items: center;
  gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { height: 28px; width: 28px; border-radius: 6px; object-fit: cover; }
.brand-name { font-size: 15px; font-weight: 600; color: var(--text); letter-spacing: -0.01em; }

/* Language switcher */
.lang-wrap { position: relative; }
.lang-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: transparent; border: 1px solid var(--border);
  border-radius: 980px; padding: 6px 12px;
  font-size: 13px; color: var(--text); cursor: pointer;
  font-family: inherit;
}
.lang-btn > svg:first-child { width: 14px; height: 14px; flex-shrink: 0; }
.lang-btn > svg:last-child { width: 10px; height: 10px; flex-shrink: 0; opacity: 0.6; }
.lang-menu {
  position: absolute; right: 0; top: calc(100% + 6px);
  background: white; border-radius: 14px;
  box-shadow: 0 12px 32px rgba(0,0,0,0.15), 0 1px 4px rgba(0,0,0,0.08);
  padding: 6px; min-width: 180px;
  z-index: 110; opacity: 0; pointer-events: none;
  transform: translateY(-4px);
  transition: opacity 0.18s, transform 0.18s;
}
.lang-menu.open { opacity: 1; pointer-events: auto; transform: translateY(0); }
.lang-option {
  display: block; width: 100%; padding: 10px 14px;
  border: 0; background: transparent; cursor: pointer;
  font-family: inherit; font-size: 14px; color: var(--text);
  text-align: left; border-radius: 8px;
}
.lang-option:hover { background: var(--bg-soft); }
.lang-option.active { color: var(--accent); font-weight: 500; }

/* Page content */
.info-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 60px 24px 100px;
}
.info-page h1 {
  font-size: clamp(34px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}
.info-page .last-updated {
  color: var(--text-dim);
  font-size: 14px;
  margin-bottom: 48px;
}
.info-page h2 {
  font-size: 22px;
  font-weight: 600;
  margin: 40px 0 16px;
  letter-spacing: -0.01em;
}
.info-page h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 8px;
}
.info-page p {
  margin: 12px 0;
  color: #2c2c2e;
}
.info-page ul, .info-page ol { padding-left: 24px; }
.info-page li { margin: 8px 0; }
.info-page table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 15px;
}
.info-page th, .info-page td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.info-page th { background: var(--bg-soft); font-weight: 600; }
.info-page .accent-box {
  background: var(--bg-soft);
  border-radius: 14px;
  padding: 20px 24px;
  margin: 24px 0;
}
.info-page .accent-box.warning { background: #fff4e5; }

/* FAQ accordion */
.faq-item { border-bottom: 1px solid var(--border); padding: 18px 0; }
.faq-q {
  font-weight: 600; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  list-style: none; gap: 16px;
}
.faq-q::-webkit-details-marker { display: none; }
.faq-q::after { content: '+'; font-size: 22px; color: var(--text-dim); flex-shrink: 0; }
details[open] .faq-q::after { content: '−'; }
.faq-a { margin-top: 12px; color: #2c2c2e; }

/* Back to home */
.info-back {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--text-dim); text-decoration: none;
  font-size: 14px; margin-bottom: 32px;
}
.info-back:hover { color: var(--text); }

/* Cross-page footer (2 rows) */
.info-footer {
  border-top: 1px solid var(--border);
  padding: 36px 24px 48px;
  background: var(--bg-soft);
}
.info-footer-inner {
  max-width: 760px; margin: 0 auto;
  text-align: center;
}
.info-footer-row {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 8px 24px; margin-bottom: 8px;
  font-size: 14px;
}
.info-footer-row a {
  color: var(--text); text-decoration: none;
  padding: 4px 0;
}
.info-footer-row a:hover { color: var(--accent); }
.info-footer-copy {
  margin-top: 18px;
  font-size: 12px; color: var(--text-dim);
}

/* Lang block toggle */
.lang-block { display: none; }
.lang-block.active { display: block; }

@media (max-width: 640px) {
  .info-page { padding: 40px 20px 80px; }
  .info-page h1 { font-size: 30px; }
  .nav-inner { padding: 10px 16px; }
  .brand-name { display: none; }
  .info-footer-row { gap: 6px 16px; font-size: 13px; }
}