:root, body, body[class] {
  --junior: #1d4ed8;
  --junior-soft: #e8efff;
  --ok: #157a3a;
  --ok-bg: #dcfce7;
  --bad: #b91c1c;
  --bad-bg: #fee2e2;
  --warn: #9a3412;
  --warn-bg: #ffedd5;
  --unk: #475569;
  --unk-bg: #e8eef6;
  --node-primary: #0f766e;
  --node-primary-bg: #d5f3ee;
  --node-junior: #1d4ed8;
  --node-junior-bg: #dbe7ff;
  --node-senior: #a21caf;
  --node-senior-bg: #fae8ff;
  --node-current-bg: #fff4e5;
  --node-current-border: #ea580c;
  --node-text: #162033;
  --edge: #526274;
  --edge-soft: #8aa0b4;
  --hard-bg: #ffedd5;
  --hard-fg: #9a3412;
  --soft-bg: #e7eef6;
  --soft-fg: #475569;
  --diagram-ok-bg: #dcfce7;
  --diagram-ok: #157a3a;
  --diagram-bad-bg: #fee2e2;
  --diagram-bad: #b91c1c;
  --diagram-unk-bg: #f1f5f9;
  --diagram-unk: #64748b;
  --diagram-shaky-bg: #fef3c7;
  --diagram-shaky: #b45309;
  --diagram-text: #162033;
  --diagram-edge: #64748b;
}
:root, body, body[class], .site-header {
  color-scheme: light;
  --bg: #f4f8fc;
  --bg-elev: #ffffff;
  --bg-muted: #edf5ff;
  --card: #ffffff;
  --panel: #ffffff;
  --text: #17212f;
  --ink: #17212f;
  --muted: #5b6b7e;
  --ink-soft: #5b6b7e;
  --line: #dce5ee;
  --brand: #0668e8;
  --primary: #0668e8;
  --primary-dark: #0456c3;
  --brand-strong: #0456c3;
  --brand-soft: #e8f2ff;
  --on-brand: #ffffff;
  --focus: #0668e8;
  --accent: #147bcf;
  --header-bg: #ffffff;
  --logo-sheet: #e1efff;
  --logo-fold: #ffffff;
  --bg1: #f0f7ff;
  --bg2: #f8fafc;
  --radius: 18px;
  --shadow: 0 8px 28px rgba(31, 72, 120, .06);
  --node-text: #162033;
  --diagram-text: #162033;
}
body {
  background: radial-gradient(ellipse at 15% 0, #e4f1ff, transparent 58%), #f4f8fc;
  color: var(--text);
}
body.page-explore { background: #f4f8fc; }
.site-header {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px 28px;
  padding: 14px 28px;
  border-color: var(--line);
  box-shadow: 0 2px 14px rgba(31, 72, 120, .04);
}
.site-header .site-nav { justify-content: flex-end; gap: 8px 16px; }
.site-header .brand { flex-shrink: 0; justify-content: flex-start; letter-spacing: normal; }
.site-header .brand-name { white-space: nowrap; }
.site-header .subject-switch { max-width: 100%; min-width: 0; overflow-x: auto; scrollbar-width: none; border-radius: 14px; background: #f0f5fa; }
.site-header .subject-switch .nav-link { flex: 0 0 auto; }
.site-header .page-links { gap: 4px; }
.site-header .nav-link { white-space: nowrap; min-height: 40px; padding: 0 12px; border-radius: 12px; }
.site-header .nav-link.active, .site-header .nav-link[aria-current="page"] { color: #0456c3; background: #e8f2ff; }
.site-header .nav-link.subject-link.on { background: #0668e8; color: #fff; }
.home { width: min(1160px, 100%); padding: 32px 24px 56px; }
.page-home .hero { padding: 36px; border-radius: 24px; }
.page-home .eyebrow { max-width: 85ch; color: #54718e; font-weight: 500; line-height: 1.8; letter-spacing: 0; }
.page-home .hero h1 { font-size: clamp(1.8rem, 3.4vw, 2.7rem); line-height: 1.3; text-wrap: balance; }
.page-home .lede { max-width: 82ch; line-height: 1.85; font-size: 1rem; }
.page-home .hero-actions { margin-top: 24px; gap: 12px; }
.page-home .hero-actions .btn { flex: 0 1 240px; min-height: 48px; }
.btn-primary, button.primary { box-shadow: 0 4px 12px rgba(6, 104, 232, .15); }
.section-title { margin: 28px 0 14px; }
.steps, .stat-grid, .grade-grid { gap: 16px; }
.steps li, .stat-card, a.grade-card, a.iq-card { box-shadow: var(--shadow); }
.steps li { padding: 20px; }
.steps p { line-height: 1.75; }
a.grade-card { gap: 5px; padding: 16px; }
.stat-card { padding: 20px; }
.stat-num { margin-bottom: 6px; color: #0456c3; }
main#root, main.kids { padding-top: 28px; }
.card, .kid-card, .kid-form, .kid-backup { box-shadow: var(--shadow); }
.page-explore .graph-pane { background: #f4f8fc; }
.page-explore .side-tools { gap: 10px; padding: 16px; }
.page-explore .detail { padding: 20px; }
.assessment-page { font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; }
.assessment-page #app { max-width: 1040px; padding: 28px 24px 40px; }
.assessment-page .screen:not(.landing) { max-width: 760px; margin: 0 auto; }
.assessment-page .landing { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; align-items: start; }
.assessment-page .landing > .hero { grid-column: 1 / -1; padding: 8px 0 4px; }
.assessment-page .hero h1 { color: #17212f; font-size: clamp(1.6rem, 3vw, 2rem); letter-spacing: -.02em; }
.assessment-page .land-section { margin: 0; padding: 20px; border: 1px solid var(--line); background: #edf5ff; border-radius: 20px; min-width: 0; }
.assessment-page .sec-title { text-align: left; margin: 0 0 16px; font-size: 1.2rem; }
.assessment-page .card { border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); padding: 20px; margin: 16px 0; }
.assessment-page .land-section .card { margin: 0 0 16px; }
.assessment-page .land-section .card:last-child { margin-bottom: 0; }
.assessment-page .card h3 { font-size: 1.1rem; }
.assessment-page .btn { border-width: 1px; border-radius: 14px; font-weight: 650; font-size: 1rem; min-height: 46px; }
.assessment-page .btn.big { font-size: 1rem; padding: 13px 18px; margin-top: 16px; }
.assessment-page .btn.primary, .assessment-page .btn.primary.finish { background: #0668e8; border-color: #0668e8; box-shadow: 0 4px 12px rgba(6, 104, 232, .15); }
.assessment-page .btn.ghost { border-color: var(--line); }
.assessment-page .chip { background: #edf5ff; border-width: 1px; border-radius: 12px; }
.assessment-page .chip.on { background: #0668e8; border-color: #0668e8; }
.assessment-page .eq-opt { border-width: 1px; background: #fff; border-radius: 14px; }
.assessment-page .eq-opt[aria-pressed="true"] { background: #e8f2ff; border-color: #0668e8; box-shadow: 0 0 0 2px #b9d8ff; }
.assessment-page .opt { border-width: 1px; }
.assessment-page .stats > div, .assessment-page .badge { background: #edf5ff; }
.assessment-page .dim.strong .badge { background: #d8f5ec; }
.assessment-page .dim.practice .badge { background: #fff0e0; }
.assessment-page .topbar { position: static; background: transparent; }
.assessment-page .dim-head { gap: 12px; flex-wrap: wrap; }
.assessment-page .notice.fineprint { font-size: 12px; line-height: 1.75; }
.assessment-page > footer { max-width: 1040px; margin: 0 auto; padding: 12px 24px 24px; }
.quadrant-page .app { max-width: 600px; min-height: auto; margin: 28px auto; border: 1px solid var(--line); background: #fff; border-radius: 24px; box-shadow: var(--shadow); }
.quadrant-page .screen { min-height: auto; }
.quadrant-page .spacer { min-height: 24px; flex: 0; }
.quadrant-page .hook { font-size: clamp(2.4rem, 6vw, 3.6rem); }
.quadrant-page .btn.primary, .quadrant-page .kicker, .quadrant-page .hero { background: #0668e8; }
.quadrant-page > footer { padding: 8px 20px 24px; color: #5b6b7e; font-size: .85rem; }
@media (max-width: 1180px) {
  .site-header { grid-template-columns: 1fr; gap: 12px; }
  .site-header .site-nav { justify-content: space-between; }
}
@media (max-width: 760px) {
  .site-header { padding: 12px 16px; gap: 10px; }
  .site-header .site-nav { display: grid; grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .site-header .subject-switch { justify-self: start; }
  .site-header .nav-link { font-size: .875rem; min-height: 38px; padding: 0 10px; }
  .site-header .page-links { gap: 2px; }
  .home { padding: 20px 16px 40px; }
  .page-home .hero { padding: 24px 20px; }
  .page-home .eyebrow { font-size: .8rem; line-height: 1.7; }
  .page-home .hero-actions .btn { flex: 1 1 150px; }
  .steps, .stat-grid, .grade-grid { gap: 12px; }
  .assessment-page #app { padding: 20px 16px 32px; }
  .assessment-page .landing { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .assessment-page .land-section, .assessment-page .card { padding: 18px; }
  .assessment-page .infos .info { padding: 0; }
  .quadrant-page .app { width: calc(100% - 32px); margin: 20px 16px; padding: 22px 18px; }
}
@media print {
  body { background: #fff; }
  .site-header { display: none; }
  .card, .stat-card, .steps li, .quadrant-page .app { box-shadow: none; }
}

.site-header .subject-switch::-webkit-scrollbar { display: none; }
@media (max-width: 760px) { .site-header .subject-switch .nav-link { padding: 0 6px; font-size: .82rem; } }
#grade-card .stage-tabs[aria-label="年级"] { display: grid; grid-template-columns: repeat(auto-fit, minmax(84px, 1fr)); gap: 8px; }
#grade-card .stage-tabs[aria-label="年级"] button { white-space: nowrap; padding-inline: 8px; }
@media (max-width: 760px) { #grade-card .stage-tabs[aria-label="年级"] { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

@media (max-width: 760px) { .site-header .page-links { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); width: 100%; } .site-header .page-links .nav-link { justify-content: center; } }