:root {
  --brand: #1677ff;
  --brand-dark: #0958d9;
  --brand-soft: #e6f4ff;
  --bg: #f5f8fa;
  --panel: #ffffff;
  --text: #101828;
  --muted: #475467;
  --border: #eaecf0;
  --navy: #0b1220;
  --success: #12b76a;
  --warning: #f79009;
  --danger: #d92d20;
  --radius: 16px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --shadow: 0 4px 16px rgba(16, 24, 40, 0.06);
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}

.brand-logo {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, #1677ff 0%, #0958d9 100%);
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 16px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 14px;
  color: var(--muted);
}

.nav-links a { color: inherit; font-weight: 500; }
.nav-links a:hover, .nav-links a.active { color: var(--brand); }

.breadcrumb {
  max-width: 1060px;
  margin: 0 auto;
  padding: 14px 24px;
  font-size: 13px;
  color: var(--muted);
}

.breadcrumb a { color: var(--muted); }
.breadcrumb .sep { margin: 0 6px; opacity: 0.5; }

main {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 24px 64px;
}

.hero {
  text-align: center;
  padding: 54px 0 34px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 20px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
}

.hero h1 {
  font-size: 42px;
  letter-spacing: -0.03em;
  line-height: 1.12;
  color: var(--navy);
  margin: 0 0 14px;
}

.subline {
  font-size: 19px;
  line-height: 1.55;
  color: var(--muted);
  max-width: 760px;
  margin: 0 auto;
}

.updated {
  margin-top: 18px;
  color: #667085;
  font-size: 13px;
}

.block { margin: 0 0 48px; }

.block h2 {
  font-size: 28px;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--navy);
  margin: 0 0 14px;
}

.block h3 {
  font-size: 19px;
  color: var(--navy);
  margin: 24px 0 10px;
}

.block p,
.block li {
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.75;
}

.block ul,
.block ol {
  padding-left: 22px;
  margin: 0 0 18px;
}

.block li { margin-bottom: 8px; }

.block code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  padding: 1px 6px;
  border-radius: 4px;
  background: #f2f4f7;
  color: #344054;
}

.answer-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin: 20px 0;
}

.answer-box strong { color: var(--navy); }

.risk-box,
.safe-box,
.note-box {
  border-radius: var(--radius);
  padding: 22px;
  margin: 18px 0;
}

.risk-box { background: #fef3f2; border: 1px solid #fecdca; }
.risk-box h3, .risk-box strong { color: #b42318; }
.risk-box p, .risk-box li { color: #912018; }

.safe-box { background: #ecfdf3; border: 1px solid #abefc6; }
.safe-box h3, .safe-box strong { color: #027a48; }
.safe-box p, .safe-box li { color: #05603a; }

.note-box { background: #fffbeb; border: 1px solid #fef0c7; }
.note-box h3, .note-box strong { color: #b54708; }
.note-box p, .note-box li { color: #93370d; }

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 22px 0;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.card h3 {
  font-size: 17px;
  margin: 0 0 8px;
}

.card p {
  font-size: 14px;
  margin: 0;
}

.table-wrap {
  overflow-x: auto;
  margin: 18px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
}

th, td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  font-size: 14px;
  line-height: 1.55;
}

th { color: var(--navy); background: #f9fafb; }
td { color: var(--muted); }
tr:last-child td { border-bottom: 0; }

.cta-bar {
  text-align: center;
  background: var(--navy);
  color: #fff;
  border-radius: 24px;
  padding: 36px 24px;
  margin: 52px 0 20px;
}

.cta-bar h2 {
  margin: 0 0 10px;
  color: #fff;
  font-size: 26px;
}

.cta-bar p {
  margin: 0 0 20px;
  color: #cbd5e1;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  padding: 14px 22px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  text-decoration: none;
}

.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 12px 24px rgba(22, 119, 255, 0.24); }
.btn-primary:hover { background: var(--brand-dark); color: #fff; }
.btn-ghost { background: #fff; color: var(--text); border-color: var(--border); margin-left: 10px; }
.btn-ghost:hover { color: var(--brand); }

.faq details { border-bottom: 1px solid var(--border); }
.faq summary {
  padding: 18px 0;
  cursor: pointer;
  font-weight: 700;
  font-size: 16px;
  color: var(--navy);
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 22px; color: var(--muted); }
.faq details[open] summary::after { content: "-"; }
.faq .answer { padding: 0 0 18px; color: var(--muted); font-size: 15px; line-height: 1.75; }

.related {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.related a {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

.related a:hover {
  color: var(--brand);
  border-color: var(--brand);
}

footer {
  background: #fff;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--brand); }

@media (max-width: 780px) {
  .hero h1 { font-size: 30px; }
  .subline { font-size: 16px; }
  .grid { grid-template-columns: 1fr; }
  .nav-links a:nth-child(n+4) { display: none; }
  .btn { width: 100%; justify-content: center; }
  .btn-ghost { margin-left: 0; margin-top: 10px; }
}