:root {
  --bg: #F2F2F2; --surface: #FFFFFF; --surface2: #EBEBEB; --border: #D8D8D8;
  --text: #1A1A1A; --text-muted: #666666; --text-hint: #AAAAAA;
  --accent: #E8670A; --accent-light: #FDF0E6;
  --success: #1A7A4A; --success-light: #E6F5ED;
  --warn: #8A5A00; --warn-light: #FDF4E3;
  --danger: #C03030; --danger-light: #FDECEC;
  --radius: 12px; --radius-sm: 8px;
}
[data-theme="dark"] {
  --bg: #1A1A1A; --surface: #242424; --surface2: #2E2E2E; --border: #404040;
  --text: #C8C8C8; --text-muted: #888888; --text-hint: #555555;
  --accent: #F07820; --accent-light: #2E1E0A;
  --success: #30B865; --success-light: #0A2018;
  --warn: #D4952A; --warn-light: #251800;
  --danger: #E05050; --danger-light: #280C0C;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'DM Sans', sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; line-height: 1.6; }
header {
  background: var(--surface); border-bottom: 1px solid var(--border);
  padding: 0 2rem; display: flex; align-items: center; justify-content: space-between;
  height: 60px; position: sticky; top: 0; z-index: 100;
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 15px; font-weight: 600; color: var(--text); text-decoration: none; }
.logo-icon { width: 32px; height: 32px; background: var(--accent); border-radius: 8px; display: flex; align-items: center; justify-content: center; }
.logo-icon svg { color: white; }
.theme-btn, .lang-btn {
  height: 36px; background: var(--surface2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); cursor: pointer; color: var(--text-muted);
  font-family: 'DM Sans', sans-serif; font-size: 13px;
}
.theme-btn { width: 36px; display: flex; align-items: center; justify-content: center; }
.lang-btn { display: flex; align-items: center; gap: 6px; padding: 0 10px; font-weight: 500; }
.lang-switcher { position: relative; }
.lang-dropdown { display: none; position: absolute; top: calc(100% + 6px); right: 0; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: 0 8px 24px rgba(0,0,0,0.14); z-index: 200; padding: 8px; min-width: 200px; }
.lang-dropdown.open { display: block; }
.lang-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; max-height: 280px; overflow-y: auto; }
.lang-option { display: flex; align-items: center; gap: 6px; padding: 7px 8px; border: none; background: none; border-radius: 6px; font-size: 12px; font-family: 'DM Sans', sans-serif; color: var(--text); cursor: pointer; text-align: left; }
.lang-option:hover { background: var(--surface2); }
.lang-option.active { background: var(--accent-light); color: var(--accent); font-weight: 600; }
.page-wrap { max-width: 680px; margin: 0 auto; padding: 3rem 1.5rem 4rem; }
.guide-intro {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  margin-bottom: 1.25rem;
}
.guide-intro h1 {
  font-size: 24px; font-weight: 600; line-height: 1.35;
  color: var(--text); margin: 0 0 10px;
  word-wrap: break-word; overflow-wrap: break-word;
}
.guide-intro .guide-subtitle {
  display: block; font-size: 15px; color: var(--text-muted);
  line-height: 1.55; margin: 0 0 8px;
}
.guide-intro .guide-meta { display: block; font-size: 12px; color: var(--text-hint); margin: 0; }
.guide-intro .guide-divider { border: none; border-top: 1px solid var(--border); margin: 1.25rem 0; }
.guide-intro .guide-kicker {
  display: block; font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--accent); margin: 0 0 12px;
}
.guide-intro .quick-point {
  display: block; font-size: 14px; line-height: 1.55;
  color: var(--text-muted); margin: 0 0 10px;
  padding: 12px 14px; background: var(--accent-light);
  border-radius: var(--radius-sm);
  word-wrap: break-word; overflow-wrap: break-word;
}
.guide-intro .quick-point:last-child { margin-bottom: 0; }
.guide-intro .quick-point strong { color: var(--text); font-weight: 600; }
.page-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.75rem; margin-bottom: 1.25rem;
}
.page-card h2 { font-size: 17px; font-weight: 600; margin: 0 0 12px; padding-bottom: 10px; border-bottom: 1px solid var(--border); }
.page-card h3 { font-size: 15px; font-weight: 600; color: var(--text); margin: 18px 0 8px; }
.page-card p, .page-card li { font-size: 14px; color: var(--text-muted); line-height: 1.75; margin: 0 0 12px; }
.page-card ul, .page-card ol { padding-left: 1.25rem; margin: 0 0 12px; }
.page-card li { margin-bottom: 6px; }
.page-card a { color: var(--accent); text-decoration: none; }
.page-card a:hover { text-decoration: underline; }
.page-card strong { color: var(--text); }
.alert-warn {
  background: var(--warn-light); border: 1px solid var(--warn);
  border-radius: var(--radius-sm); padding: 12px 14px; font-size: 14px;
  color: var(--text); margin: 12px 0;
}
.cta-box {
  text-align: center; padding: 1.5rem;
  background: var(--surface2); border-radius: var(--radius-sm); margin-top: 8px;
}
.cta-box a {
  display: inline-block; margin-top: 10px; padding: 10px 18px;
  background: var(--accent); color: #fff; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 14px; text-decoration: none;
}
.cta-box a:hover { opacity: 0.9; text-decoration: none; }
.guide-more { margin-top: 0; }
.guide-more h2 { font-size: 15px; border: none; padding: 0; margin-bottom: 10px; }
.guide-more ul { list-style: none; padding: 0; margin: 0; }
.guide-more li { margin: 0 0 8px; }
.guide-more a { font-size: 14px; }
.nav-links { display: flex; gap: 1.5rem; margin-top: 1rem; flex-wrap: wrap; }
.nav-links a { font-size: 14px; color: var(--accent); text-decoration: none; }
footer {
  text-align: center; padding: 2rem; font-size: 12px; color: var(--text-hint);
  border-top: 1px solid var(--border); margin-top: 2rem;
}
.footer-copyright { margin-top: 14px; }
.footer-copyright a { color: var(--text-muted); text-decoration: none; }
@media (max-width: 520px) {
  header { padding: 0 1rem; }
  .page-wrap { padding: 2rem 1rem 3rem; }
  .guide-intro { padding: 1.25rem 1.35rem; }
  .guide-intro h1 { font-size: 21px; }
  .guide-intro .quick-point { font-size: 13px; padding: 10px 12px; }
}