:root {
  --surface: rgba(255,255,255,0.88);
  --text: #101114;
  --muted: #6c7280;
  --line: rgba(16,17,20,0.06);
  --blue: #4f7cff;
  --shadow: 0 20px 60px rgba(17,24,39,0.08);
  --shadow-hover: 0 24px 64px rgba(17,24,39,0.10);
  --radius-xl: 40px;
  --radius-lg: 28px;
  --max: 1220px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif; background: linear-gradient(180deg, #f7f8fc 0%, #eef1f7 60%, #f5f6fa 100%); color: var(--text); line-height: 1.7; overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
html,
body,
body * {
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

img {
  -webkit-user-drag: none;
  user-drag: none;
  user-select: none;
}

a,
button {
  -webkit-tap-highlight-color: transparent;
}
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
#site-header { position: sticky; top: 0; z-index: 100; }
.nav-shell { position: relative; background: rgba(244,246,251,0.68); backdrop-filter: blur(18px) saturate(1.2); -webkit-backdrop-filter: blur(18px) saturate(1.2); border-bottom: 1px solid rgba(16,17,20,0.05); }
.nav-shell .wrap { position: relative; }
.nav { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 12px 0; transition: min-height 0.22s ease, padding 0.22s ease; }
#site-header.header-compact .nav { min-height: 60px; padding: 8px 0; }
.brand { display: flex; flex-direction: column; gap: 2px; font-size: 15px; font-weight: 650; transition: font-size 0.22s ease, gap 0.22s ease; }
#site-header.header-compact .brand { font-size: 14px; gap: 1px; }
.brand small { font-size: 12px; color: var(--muted); transition: font-size 0.22s ease; }
#site-header.header-compact .brand small { font-size: 11px; }
.nav-links { display: flex; flex-wrap: wrap; justify-content: flex-end; align-items: center; gap: 8px; padding: 6px; border-radius: 999px; background: rgba(255,255,255,0.38); border: 1px solid rgba(16,17,20,0.04); box-shadow: 0 8px 24px rgba(17,24,39,0.04); transition: padding 0.22s ease, box-shadow 0.22s ease, background 0.22s ease; }
#site-header.header-compact .nav-links { padding: 4px; background: rgba(255,255,255,0.46); box-shadow: 0 10px 26px rgba(17,24,39,0.05); }
.nav-link { padding: 10px 14px; font-size: 13px; border: 1px solid transparent; background: transparent; color: var(--muted); border-radius: 999px; transition: 0.22s ease; white-space: nowrap; }
#site-header.header-compact .nav-link { padding: 8px 12px; font-size: 12px; }
.nav-link:hover,.nav-link.active { background: rgba(255,255,255,0.66); border-color: rgba(16,17,20,0.06); color: var(--text); box-shadow: 0 8px 24px rgba(17,24,39,0.06); }
.lang { display: flex; gap: 6px; margin-left: 4px; padding-left: 2px; border-left: 1px solid rgba(16,17,20,0.06); }
.lang button {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: .2s;
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  flex: 0 0 auto;
  padding: 0;
}
#site-header.header-compact .lang button {
  width: 36px;
  height: 36px;
  font-size: 12px;
}
.lang button:hover,.lang button.active { background: white; border-color: rgba(16,17,20,.2); color: #000; }
.site-footer { text-align: center; padding: 18px 24px 30px; color: var(--muted); font-size: 12px; }
.site-footer-record { margin-top: 6px; }
.section-head { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; margin-bottom: 22px; }
.section-head h2 { margin: 0; font-size: 30px; line-height: 1.1; letter-spacing: -0.04em; }
.section-head p { margin: 0; color: var(--muted); font-size: 15px; max-width: 420px; text-align: right; line-height: 1.8; }
.card-surface { background: var(--surface); border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.card-float { transform: translate3d(0,0,0); transition: transform 0.18s ease-out, box-shadow 0.18s ease-out; }
.card-float::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at var(--mx, 50%) var(--my, 50%), rgba(255,255,255,0.40), transparent 26%); pointer-events: none; opacity: .9; }
.card-lift { transition: transform 0.22s ease, box-shadow 0.22s ease; }
.card-lift:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.secondary-page { padding: 48px 0 40px; }
.secondary-hero { position: relative; background: var(--surface); border-radius: var(--radius-xl); box-shadow: var(--shadow); padding: 48px 52px; margin-bottom: 28px; }
.secondary-eyebrow { display: inline-flex; padding: 7px 12px; border-radius: 999px; background: rgba(255,255,255,0.6); border: 1px solid rgba(16,17,20,0.05); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 650; }
.secondary-title { margin: 18px 0 0; font-size: clamp(32px, 4vw, 48px); line-height: 1.04; letter-spacing: -0.05em; }
.secondary-desc { margin-top: 18px; max-width: 860px; color: var(--muted); font-size: 17px; line-height: 1.9; }
.secondary-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.secondary-card { background: var(--surface); border-radius: var(--radius-lg); box-shadow: var(--shadow); padding: 28px 26px; }
.secondary-card h3 { margin: 0; font-size: 22px; line-height: 1.22; letter-spacing: -0.02em; }
.secondary-card p { margin: 14px 0 0; color: var(--muted); font-size: 15px; line-height: 1.85; }
.secondary-card ul { margin: 12px 0 0; padding-left: 18px; color: #404552; font-size: 14px; line-height: 1.9; }
.secondary-cta { margin-top: 28px; background: var(--surface); border-radius: var(--radius-lg); box-shadow: var(--shadow); padding: 30px 32px; }
.secondary-cta h3 { margin: 0; font-size: 24px; line-height: 1.2; letter-spacing: -0.03em; }
.secondary-cta p { margin: 12px 0 0; color: var(--muted); font-size: 15px; line-height: 1.85; }
@media (max-width: 1080px) { .section-head { flex-direction: column; } .section-head p { text-align: left; max-width: none; } .secondary-grid { grid-template-columns: 1fr; } }
@media (max-width: 760px) { .nav { flex-direction: column; align-items: stretch; padding: 14px 0; } .nav-links { justify-content: flex-start; gap: 6px; } .lang { margin-left: 0; padding-left: 0; border-left: none; } .wrap { padding: 0 16px; } .secondary-hero { padding: 30px 24px; } .secondary-title { font-size: 34px; } .secondary-desc { font-size: 16px; } }
.content-panel .panel-main .panel-section-title{
  margin: 22px 0 10px;
  font-size: 18px;
  line-height: 1.45;
  font-weight: 600;
  color: var(--text);
  scroll-margin-top: 110px;
}

.content-panel .panel-side ul.panel-points{
  list-style: none;
  margin: 0;
  padding: 0;
}

.content-panel .panel-side ul.panel-points li{
  margin: 0;
  border-top: 1px solid rgba(16,17,20,0.08);
}

.content-panel .panel-side ul.panel-points li:last-child{
  border-bottom: 1px solid rgba(16,17,20,0.08);
}

.content-panel .panel-side ul.panel-points a,
.content-panel .panel-side ul.panel-points span{
  display: block;
  padding: 16px 0;
  color: var(--muted);
  text-decoration: none;
  line-height: 1.75;
  transition: transform 0.22s ease, color 0.22s ease;
}

.content-panel .panel-side ul.panel-points a:hover{
  transform: translateX(10px);
  color: var(--text);
}

.content-panel .panel-side ul.panel-points a:focus-visible{
  outline: none;
  transform: translateX(10px);
  color: var(--text);
}
/* 右侧目录固定可见 */
.content-panel .panel-side{
  position: sticky;
  top: 110px;
  align-self: start;
}

/* 当前章节高亮 */
.content-panel .panel-side ul.panel-points a.active{
  transform: translateX(10px);
  color: var(--text);
  font-weight: 600;
}

/* 可选：高亮时加一点左侧视觉强调 */
.content-panel .panel-side ul.panel-points a.active::before{
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 10px;
  border-radius: 999px;
  background: var(--blue);
  vertical-align: middle;
}

@media (max-width: 980px) {
  .content-panel .panel-side {
    display: none;
  }
}