:root {
  --brand: #0B5FFF;
  --brand-dark: #073FA6;
  --brand-light: #EEF3FF;
  --ink: #0E1116;
  --muted: #5B6472;
  --line: #E4E8EE;
  --bg: #F7F9FC;
  --highlight: #FFF7DB;
  --success: #059669;
  --success-bg: #D1FAE5;
  --warn: #B45309;
  --warn-bg: #FEF3C7;
  --danger: #DC2626;
  --danger-bg: #FEE2E2;
  --subitem-bg: #D1F2EB;
  --subitem-border: #0F766E;
  --subtotal-bg: #FDEBD0;
  --subtotal-border: #B45309;
  --grandtotal-bg: #FEF3C7;
  --grandtotal-border: #92400E;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  margin: 0;
  padding: 0;
  max-width: none;
  line-height: 1.7;
  font-size: 15px;
}

/* ========== Top Nav Bar ========== */
.topnav {
  background: linear-gradient(135deg, var(--brand-dark), var(--brand));
  color: #fff;
  padding: 14px 32px;
  box-shadow: 0 2px 10px rgba(11, 95, 255, 0.15);
  position: sticky;
  top: 0;
  z-index: 100;
}
.topnav-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.topnav-brand,
.topnav-brand:visited {
  font-weight: 700;
  font-size: 16px;
  color: #fff;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.topnav-brand:hover { opacity: 0.9; text-decoration: none; color: #fff; }
.topnav-back,
.topnav-back:visited {
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.28);
  padding: 5px 12px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  margin-right: 12px;
  transition: all 0.15s;
  flex-shrink: 0;
}
.topnav-back:hover {
  background: rgba(255, 255, 255, 0.28);
  color: #fff;
  text-decoration: none;
  transform: translateX(-2px);
}
.topnav-brand::before {
  content: "▲";
  font-size: 14px;
  opacity: 0.85;
}
.topnav-links {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
}
.topnav-link,
.topnav-link:visited {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.15s;
}
.topnav-link:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  text-decoration: none;
}
.topnav-link.active,
.topnav-link.active:visited {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
}

/* ========== Container ========== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 32px 60px;
}

/* ========== Headings ========== */
h1 {
  font-size: 28px;
  color: var(--brand-dark);
  border-bottom: 3px solid var(--brand);
  padding-bottom: 10px;
  margin-top: 0;
  scroll-margin-top: 80px;
}
h2 {
  font-size: 22px;
  color: var(--brand-dark);
  border-left: 4px solid var(--brand);
  padding-left: 12px;
  margin-top: 40px;
  scroll-margin-top: 80px;
}
h3 {
  font-size: 17px;
  color: var(--brand);
  margin-top: 26px;
  scroll-margin-top: 80px;
}
h4 { font-size: 15px; color: var(--brand-dark); margin-top: 20px; }

/* ========== Content ========== */
blockquote {
  background: #FFFDF3;
  border-left: 4px solid #E5B94A;
  padding: 10px 16px;
  color: #4A4736;
  margin: 16px 0;
  border-radius: 3px;
}
blockquote p { margin: 6px 0; }

table {
  border-collapse: collapse;
  width: 100%;
  margin: 12px 0;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  font-size: 14px;
  border-radius: 6px;
  overflow: hidden;
}
th, td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; vertical-align: top; }
th {
  background: linear-gradient(180deg, #EEF3FF, #E4EBFF);
  color: var(--brand-dark);
  font-weight: 600;
  white-space: nowrap;
}
tr:nth-child(even) td { background: #FAFBFD; }

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

hr { border: none; border-top: 1px dashed var(--line); margin: 32px 0; }
ol, ul { padding-left: 26px; }
li { margin-bottom: 4px; }
code {
  background: #EEF2F8;
  padding: 2px 6px;
  border-radius: 3px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
}

/* ========== Hero (index) ========== */
.hero {
  background: linear-gradient(135deg, #1E40AF 0%, #0B5FFF 100%);
  color: #fff;
  border-radius: 12px;
  padding: 32px 36px;
  margin: 24px 0 32px;
  box-shadow: 0 6px 20px rgba(11, 95, 255, 0.2);
}
.hero h1 {
  color: #fff;
  border: none;
  margin: 0 0 8px;
  font-size: 24px;
  padding: 0;
}
.hero-sub {
  color: rgba(255, 255, 255, 0.9);
  font-size: 15px;
  margin-bottom: 20px;
}
.hero-kpi {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-top: 20px;
}
.hero-kpi-card {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  padding: 14px 16px;
}
.hero-kpi-label {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.hero-kpi-value {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}
.hero-kpi-sub {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.75);
  margin-top: 2px;
}

/* ========== Scheme Cards (index) ========== */
.scheme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 20px;
  margin: 24px 0 32px;
}
.scheme-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px 26px;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05);
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}
.scheme-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.12);
  border-color: var(--brand);
}
.scheme-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--brand), var(--brand-dark));
}
.scheme-card.recommended::before {
  background: linear-gradient(90deg, var(--success), #047857);
}
.scheme-card-badge {
  display: inline-block;
  background: var(--brand-light);
  color: var(--brand-dark);
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 8px;
}
.scheme-card.recommended .scheme-card-badge {
  background: var(--success-bg);
  color: var(--success);
}
.scheme-card-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--brand-dark);
  margin: 0 0 6px;
}
.scheme-card.recommended .scheme-card-title { color: var(--success); }
.scheme-card-flow {
  font-family: ui-monospace, Menlo, monospace;
  font-size: 13px;
  color: var(--muted);
  background: #F8FAFC;
  padding: 8px 12px;
  border-radius: 6px;
  margin: 10px 0 14px;
  border: 1px dashed var(--line);
}
.scheme-card-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 14px 0;
}
.scheme-stat {
  padding: 8px 10px;
  background: #F8FAFC;
  border-radius: 6px;
}
.scheme-stat-label { font-size: 11px; color: var(--muted); margin-bottom: 2px; }
.scheme-stat-value { font-size: 16px; font-weight: 700; color: var(--ink); }
.scheme-stat-value.good { color: var(--success); }
.scheme-stat-value.warn { color: var(--warn); }
.scheme-card-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--brand);
  color: #fff !important;
  padding: 8px 16px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 14px;
  margin-top: 12px;
  text-decoration: none !important;
  transition: all 0.15s;
}
.scheme-card-cta:hover {
  background: var(--brand-dark);
  transform: translateX(2px);
}
.scheme-card.recommended .scheme-card-cta {
  background: var(--success);
}
.scheme-card.recommended .scheme-card-cta:hover {
  background: #047857;
}

/* ========== Alert Boxes ========== */
.alert {
  border-radius: 8px;
  padding: 14px 18px;
  margin: 16px 0;
  border-left: 4px solid;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.alert-icon { font-size: 20px; flex-shrink: 0; }
.alert-body { flex: 1; }
.alert-title { font-weight: 700; margin-bottom: 4px; }
.alert-success { background: var(--success-bg); border-color: var(--success); color: #065F46; }
.alert-warn    { background: var(--warn-bg);    border-color: var(--warn);    color: #78350F; }
.alert-danger  { background: var(--danger-bg);  border-color: var(--danger);  color: #991B1B; }
.alert-info    { background: var(--brand-light); border-color: var(--brand);  color: var(--brand-dark); }

/* ========== Reference Cards ========== */
.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
  margin: 16px 0;
}
.ref-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 18px;
  text-decoration: none;
  color: var(--ink);
  transition: all 0.15s;
  display: block;
}
.ref-card:hover {
  border-color: var(--brand);
  box-shadow: 0 2px 8px rgba(11, 95, 255, 0.1);
  text-decoration: none;
}
.ref-card-title {
  font-weight: 600;
  color: var(--brand-dark);
  margin-bottom: 4px;
  font-size: 14px;
}
.ref-card-desc { font-size: 12px; color: var(--muted); margin-bottom: 10px; }
.ref-card-formats {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}
.ref-card-formats a.fmt {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.15s;
  border: 1px solid transparent;
}
.ref-card-formats a.fmt-pdf {
  background: #FEE2E2;
  color: #991B1B;
  border-color: #FCA5A5;
}
.ref-card-formats a.fmt-pdf:hover { background: #FCA5A5; text-decoration: none; }
.ref-card-formats a.fmt-docx {
  background: #DBEAFE;
  color: #1E40AF;
  border-color: #93C5FD;
}
.ref-card-formats a.fmt-docx:hover { background: #93C5FD; text-decoration: none; }
.ref-card-formats a.fmt-md {
  background: #E5E7EB;
  color: #374151;
  border-color: #D1D5DB;
}
.ref-card-formats a.fmt-md:hover { background: #D1D5DB; text-decoration: none; }
.ref-card-formats a.fmt-html {
  background: #D1FAE5;
  color: #065F46;
  border-color: #6EE7B7;
}
.ref-card-formats a.fmt-html:hover { background: #6EE7B7; text-decoration: none; }

/* ========== Footer ========== */
.footer {
  max-width: 1400px;
  margin: 40px auto 0;
  padding: 20px 32px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

/* ========== Responsive · legacy 768 保底 ========== */
@media (max-width: 768px) {
  .container { padding: 12px 12px 32px; }
  .topnav { padding: 8px 12px; }
  .hero { padding: 18px 16px; }
  .hero h1 { font-size: 18px; }
  .hero-kpi-value { font-size: 16px; }
  h1 { font-size: 20px; }
  h2 { font-size: 17px; margin-top: 24px; }
  h3 { font-size: 15px; }
  table { font-size: 12px; }
  th, td { padding: 6px 8px; }
  .scheme-grid { grid-template-columns: 1fr; }
}

/* ========== Page Hero (方案一/二 顶部) ========== */
.page-hero {
  background: linear-gradient(135deg, #1E40AF 0%, #0B5FFF 100%);
  color: #fff;
  border-radius: 12px;
  padding: 28px 32px;
  margin: 24px 0 28px;
  box-shadow: 0 6px 20px rgba(11, 95, 255, 0.2);
  position: relative;
  overflow: hidden;
}
.page-hero.recommended {
  background: linear-gradient(135deg, #047857 0%, #059669 100%);
  box-shadow: 0 6px 20px rgba(5, 150, 105, 0.22);
}
.page-hero.amber {
  background: linear-gradient(135deg, #92400E 0%, #D97706 100%);
  box-shadow: 0 6px 20px rgba(217, 119, 6, 0.22);
}
.page-hero-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
  padding: 3px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: 0.4px;
}
.page-hero-title {
  font-size: 24px;
  font-weight: 700;
  color: #fff;
  margin: 0 0 6px;
  line-height: 1.35;
}
.page-hero-sub {
  color: rgba(255, 255, 255, 0.9);
  font-size: 14px;
  margin-bottom: 8px;
}
.page-hero-flow {
  display: inline-block;
  font-family: ui-monospace, Menlo, monospace;
  font-size: 13px;
  color: #fff;
  background: rgba(0, 0, 0, 0.18);
  padding: 6px 12px;
  border-radius: 6px;
  margin-top: 4px;
  border: 1px solid rgba(255, 255, 255, 0.18);
}
.page-hero-kpi {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-top: 18px;
}
.page-hero-kpi-card {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  padding: 12px 14px;
}
.page-hero-kpi-label {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 3px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}
.page-hero-kpi-value {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}
.page-hero-kpi-sub {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.8);
  margin-top: 2px;
}

/* ========== Pandoc Title Block (隐藏原生 h1，用 page-hero 替代) ========== */
#title-block-header { display: none; }

/* ========== Sidebar Layout（方案一/二/三 详情页） ========== */
.container.with-sidebar {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 28px;
  align-items: start;
}
.sidebar {
  position: sticky;
  top: 76px;
  align-self: start;
  max-height: calc(100vh - 96px);
  overflow-y: auto;
  padding-right: 4px;
}
.sidebar-section {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 12px;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
}
.sidebar-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 8px;
}
.sidebar-badge {
  display: inline-block;
  background: var(--brand-light);
  color: var(--brand-dark);
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 10px;
}
.sidebar-badge.recommended { background: var(--success-bg); color: var(--success); }
.sidebar-badge.amber { background: var(--warn-bg); color: var(--warn); }
.sidebar-kpi-mini {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.sidebar-kpi-mini .row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 10px;
  background: #F8FAFC;
  border-radius: 6px;
}
.sidebar-kpi-mini .k { color: var(--muted); font-size: 12px; }
.sidebar-kpi-mini .v { font-weight: 700; font-size: 13px; color: var(--ink); }
.sidebar-kpi-mini .v.good { color: var(--success); }
.sidebar-kpi-mini .v.warn { color: var(--warn); }
.sidebar-kpi-mini .v.danger { color: var(--danger); }
.sidebar-kpi-mini .v.amber { color: #D97706; }
.sidebar-scheme {
  display: block;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 8px;
  color: var(--ink);
  text-decoration: none;
  transition: all 0.15s;
}
.sidebar-scheme:last-child { margin-bottom: 0; }
.sidebar-scheme:hover {
  border-color: var(--brand);
  background: var(--brand-light);
  text-decoration: none;
  transform: translateX(2px);
}
.sidebar-scheme .name {
  font-weight: 700;
  font-size: 13px;
  color: var(--brand-dark);
  display: block;
  margin-bottom: 2px;
}
.sidebar-scheme .desc {
  font-size: 11px;
  color: var(--muted);
  display: block;
}
.sidebar-scheme.recommended .name { color: var(--success); }
.sidebar-scheme.amber .name { color: #D97706; }
.sidebar-back {
  display: block;
  text-align: center;
  padding: 8px 12px;
  background: var(--brand-light);
  color: var(--brand-dark);
  border-radius: 6px;
  font-weight: 600;
  font-size: 13px;
  text-decoration: none;
}
.sidebar-back:hover { background: var(--brand); color: #fff; text-decoration: none; }
.main { min-width: 0; }
@media (max-width: 900px) {
  .container.with-sidebar { grid-template-columns: 1fr; gap: 0; }
  .sidebar { position: static; max-height: none; padding-right: 0; margin-bottom: 20px; }
}

/* ========== Auto TOC (sidebar 内自动生成) ========== */
#toc-auto ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}
#toc-auto > ul > li { margin-bottom: 4px; }
#toc-auto ul ul {
  padding-left: 12px;
  margin: 4px 0 6px;
  border-left: 1px dashed var(--line);
}
#toc-auto li { margin-bottom: 2px; }
#toc-auto a {
  color: var(--ink);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: 4px;
  display: block;
  font-size: 12.5px;
  line-height: 1.4;
  transition: all 0.15s;
  border-left: 2px solid transparent;
}
#toc-auto > ul > li > a {
  font-weight: 600;
  color: var(--brand-dark);
  font-size: 13px;
}
#toc-auto ul ul a {
  font-size: 12px;
  color: var(--muted);
  padding-left: 12px;
}
#toc-auto a:hover {
  background: var(--brand-light);
  color: var(--brand-dark);
  text-decoration: none;
}
#toc-auto a.active {
  background: var(--brand-light);
  color: var(--brand-dark);
  border-left-color: var(--brand);
  font-weight: 700;
}

/* ========== Pandoc TOC 侧栏化 ========== */
#TOC {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px 20px 16px 22px;
  margin: 0 0 28px;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
  font-size: 13.5px;
}
#TOC::before {
  content: "📑 目录";
  display: block;
  font-weight: 700;
  color: var(--brand-dark);
  font-size: 13px;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
}
#TOC > ul {
  padding-left: 0;
  list-style: none;
  margin: 0;
}
#TOC ul ul {
  padding-left: 18px;
  list-style: disc;
  margin: 4px 0 6px;
}
#TOC li { margin-bottom: 3px; }
#TOC a {
  color: var(--brand-dark);
  text-decoration: none;
  padding: 2px 4px;
  border-radius: 4px;
  transition: background 0.15s;
}
#TOC a:hover {
  background: var(--brand-light);
  text-decoration: none;
}
#TOC > ul > li > a {
  font-weight: 700;
  font-size: 14.5px;
  color: var(--brand-dark);
}

/* ========== Task list checkboxes（卡片化） ========== */
ul.task-list {
  list-style: none;
  padding-left: 0;
  display: grid;
  gap: 8px;
  margin: 14px 0;
}
ul.task-list li {
  display: block;
  margin: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0;
  transition: all 0.15s;
}
ul.task-list li:hover {
  border-color: var(--success);
  box-shadow: 0 2px 8px rgba(5, 150, 105, 0.1);
  transform: translateX(2px);
}
ul.task-list li label {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  cursor: pointer;
  width: 100%;
  margin: 0;
  line-height: 1.55;
  color: var(--ink);
}
ul.task-list li input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  flex-shrink: 0;
  accent-color: var(--success);
  cursor: pointer;
}
ul.task-list li:has(input:checked) {
  background: var(--success-bg);
  border-color: var(--success);
}
ul.task-list li:has(input:checked) label {
  color: #065F46;
  text-decoration: line-through;
  text-decoration-color: rgba(6, 95, 70, 0.5);
  text-decoration-thickness: 1px;
}

/* ========== Print ========== */
@media print {
  .topnav { position: static; box-shadow: none; }
  .scheme-card:hover { transform: none; }
  .page-hero { box-shadow: none; break-inside: avoid; }
}

/* ================================================================
   移动端全局自适应 (Mobile-First Global Responsive)
   ================================================================ */

/* 全局：防止横向溢出 · iOS 触感优化 */
html, body {
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
}
img, video, iframe { max-width: 100%; height: auto; }

/* Top nav · 移动端始终横向可滚动，不再垂直堆叠 */
.topnav-inner {
  flex-wrap: nowrap;
}
.topnav-links {
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  -webkit-overflow-scrolling: touch;
  flex-wrap: nowrap;
  flex: 1;
  min-width: 0;
}
.topnav-links::-webkit-scrollbar { display: none; }
.topnav-link { flex-shrink: 0; white-space: nowrap; }

/* ========== ≤ 900px（平板/大手机 · sidebar 折叠为 details） ========== */
@media (max-width: 900px) {
  .container.with-sidebar {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .sidebar {
    position: static;
    max-height: none;
    padding-right: 0;
    margin-bottom: 16px;
  }
  .sidebar-section {
    padding: 10px 14px;
    margin-bottom: 8px;
  }
  /* TOC 折叠为可展开面板 */
  #toc-auto {
    max-height: 220px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  /* 表格自动横向滚动包装 */
  table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
    max-width: 100%;
  }
  table th, table td { white-space: nowrap; }
}

/* ========== ≤ 768px（手机竖屏主流） ========== */
@media (max-width: 768px) {
  body { font-size: 14px; line-height: 1.65; }

  /* Top nav */
  .topnav-inner {
    flex-wrap: nowrap;
    gap: 6px;
    align-items: center;
    flex-direction: row;
  }
  .topnav-brand {
    font-size: 12px;
    max-width: 130px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    display: inline-block;
  }
  .topnav-brand::before { display: none; }
  .topnav-back {
    padding: 5px 10px;
    font-size: 12px;
    margin-right: 6px;
    min-width: 60px;
    text-align: center;
  }
  .topnav-links {
    gap: 4px;
    padding: 2px 0;
  }
  .topnav-link {
    padding: 5px 10px;
    font-size: 12px;
    border-radius: 5px;
  }

  /* Container padding */
  .container { padding: 10px 12px 32px; }
  .container.with-sidebar { padding: 10px 12px 32px; }

  /* Hero · 双列 KPI */
  .hero { padding: 16px 14px; border-radius: 10px; margin: 12px 0 16px; }
  .hero h1 { font-size: 17px; }
  .hero-sub { font-size: 12.5px; }
  .hero-kpi { grid-template-columns: repeat(2, 1fr); gap: 8px; margin-top: 14px; }
  .hero-kpi-card { padding: 10px 12px; }
  .hero-kpi-label { font-size: 10px; }
  .hero-kpi-value { font-size: 15px; }
  .hero-kpi-sub { font-size: 10px; }

  /* Page hero · 同上 */
  .page-hero { padding: 16px 14px; border-radius: 10px; margin: 12px 0 16px; }
  .page-hero-title { font-size: 17px; line-height: 1.3; }
  .page-hero-sub { font-size: 12.5px; }
  .page-hero-flow { font-size: 11px; padding: 4px 8px; }
  .page-hero-kpi { grid-template-columns: repeat(2, 1fr); gap: 8px; margin-top: 12px; }
  .page-hero-kpi-card { padding: 10px 12px; }
  .page-hero-kpi-value { font-size: 15px; }

  /* Scheme cards */
  .scheme-grid { grid-template-columns: 1fr !important; gap: 12px; margin: 16px 0 20px; }
  .scheme-card { padding: 16px 18px; }
  .scheme-card-title { font-size: 17px; }
  .scheme-card-flow { font-size: 11px; padding: 6px 10px; }
  .scheme-card-stats { grid-template-columns: 1fr 1fr !important; gap: 8px; }
  .scheme-stat { padding: 6px 8px; }
  .scheme-stat-value { font-size: 14px !important; }
  .scheme-stat-label { font-size: 10px; }
  .scheme-card-cta { padding: 8px 14px; font-size: 13px; }

  /* Alert boxes */
  .alert { padding: 12px 14px; gap: 10px; }
  .alert-icon { font-size: 18px; }
  .alert-title { font-size: 13.5px; }

  /* Reference cards */
  .ref-grid { grid-template-columns: 1fr; gap: 10px; }
  .ref-card { padding: 12px 14px; }

  /* Sidebar */
  .sidebar-title { font-size: 10px; }
  #toc-auto a { font-size: 12px; padding: 3px 6px; }
  #toc-auto > ul > li > a { font-size: 12.5px; }

  /* Tables · 更小字号 + 保留横滚 */
  table { font-size: 11.5px; }
  th, td { padding: 5px 7px; }

  /* Footer */
  .footer { padding: 16px 12px; font-size: 12px; }
}

/* ========== ≤ 480px（小屏手机 · iPhone SE 级） ========== */
@media (max-width: 480px) {
  body { font-size: 13.5px; }

  .container, .container.with-sidebar { padding: 8px 8px 24px; }

  /* Nav 更紧凑 */
  .topnav { padding: 6px 8px; }
  .topnav-brand {
    max-width: 90px;
    font-size: 11px;
  }
  .topnav-back {
    padding: 4px 8px;
    font-size: 11px;
    min-width: 50px;
  }
  .topnav-link { padding: 4px 8px; font-size: 11px; }

  /* Hero KPI 变单列（避免挤压） */
  .hero-kpi { grid-template-columns: 1fr; }
  .page-hero-kpi { grid-template-columns: 1fr 1fr; }

  h1 { font-size: 18px; }
  h2 { font-size: 15px; margin-top: 20px; }
  h3 { font-size: 14px; }

  /* Scheme card 单列全宽 */
  .scheme-card-stats { grid-template-columns: 1fr !important; }

  table { font-size: 11px; }
  th, td { padding: 4px 6px; }
}

/* ================================================================
   YUJ 决策工具 · 移动端自适应
   ================================================================ */
@media (max-width: 900px) {
  .tool-grid { grid-template-columns: 1fr !important; gap: 16px; }
  .tool-panel { padding: 16px 18px; }
}
@media (max-width: 768px) {
  .tool-panel { padding: 14px 16px; }
  .tool-panel h3 { font-size: 14px; margin-bottom: 12px; }
  .preset-bar {
    padding: 10px 12px;
    font-size: 12px;
    gap: 6px;
  }
  .preset-btn {
    padding: 5px 10px;
    font-size: 12px;
    border-radius: 14px;
  }
  .slider-group { margin-bottom: 16px; }
  .slider-header label { font-size: 12px; }
  .slider-header .hint { display: block; margin-left: 0; margin-top: 2px; }
  .slider-header .value {
    font-size: 14px;
    padding: 2px 8px;
    min-width: 58px;
  }
  .slider-group input[type="range"] { height: 8px; }
  .slider-group input[type="range"]::-webkit-slider-thumb {
    width: 24px; height: 24px; /* 触摸友好 */
  }
  .slider-group input[type="range"]::-moz-range-thumb {
    width: 24px; height: 24px;
  }
  .slider-group input[type="number"] { font-size: 14px; padding: 8px 10px; }
  .radio-group { flex-direction: column; gap: 8px; }
  .radio-group label { padding: 8px 12px; font-size: 13px; }
  .input-group > label { font-size: 11px; }

  .output-table { font-size: 11.5px; }
  .output-table th, .output-table td { padding: 6px 8px; }
  .output-table td .role { font-size: 10px; }

  .econ-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .econ-card { padding: 8px 10px; }
  .econ-card .label { font-size: 10px; }
  .econ-card .value { font-size: 14px; }

  .verdict { padding: 12px 14px; gap: 10px; }
  .verdict-icon { font-size: 22px; }
  .verdict-title { font-size: 14px; }
  .verdict-num { font-size: 12px; padding: 1px 5px; }

  .action-bar { gap: 6px; }
  .action-btn { padding: 8px 12px; font-size: 12px; flex: 1; min-height: 40px; }

  .methodology { font-size: 11px; padding: 10px 12px; }
}
@media (max-width: 480px) {
  .preset-bar b { width: 100%; margin-bottom: 4px; }
  .econ-grid { grid-template-columns: 1fr; }
  .action-bar { flex-direction: column; }
  .action-btn { width: 100%; }
}

/* ================================================================
   触摸目标最小尺寸（WCAG 2.5.5 · 44×44）
   ================================================================ */
@media (pointer: coarse) {
  .topnav-link,
  .topnav-back,
  .scheme-card-cta,
  .preset-btn,
  .action-btn,
  .sidebar-scheme,
  .ref-card-formats a.fmt {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}