:root {
  color-scheme: light;
  --ink: #18212f;
  --muted: #5d6878;
  --paper: #f7f4ed;
  --card: #ffffff;
  --line: #dce1e7;
  --accent: #243f76;
  --accent-soft: #e9eef8;
  --warning: #fff5d7;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.6 Georgia, "Times New Roman", serif; }
a { color: var(--accent); }
.site-header { position: sticky; top: 0; z-index: 2; display: flex; gap: 2rem; justify-content: space-between; align-items: center; padding: 1rem clamp(1.25rem, 5vw, 5rem); background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); }
.brand { color: var(--ink); font-weight: 700; text-decoration: none; letter-spacing: .01em; }
nav { display: flex; gap: 1rem; flex-wrap: wrap; }
nav a { text-decoration: none; font-family: system-ui, sans-serif; font-size: .9rem; }
main { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; padding: 1.25rem 0 4rem; }
footer { padding: 1.5rem; text-align: center; color: var(--muted); border-top: 1px solid var(--line); font-size: .9rem; }
.notice, .snapshot-note { padding: .8rem 1rem; margin-bottom: 1.25rem; border: 1px solid #e2c25a; background: var(--warning); font-family: system-ui, sans-serif; }
.hero { padding: clamp(2.5rem, 8vw, 7rem) 0 4rem; max-width: 850px; }
.hero h1, .page-heading h1 { margin: .25rem 0 1rem; font-size: clamp(2.4rem, 6vw, 5.6rem); line-height: 1; letter-spacing: -.04em; }
.lead { font-size: 1.25rem; color: var(--muted); max-width: 760px; }
.dashboard-hero { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(280px, .7fr); gap: 2rem; align-items: center; padding: 1.25rem 0 .5rem; }
.dashboard-hero h1 { max-width: 780px; margin: .35rem 0 .6rem; font-size: clamp(2.15rem, 4vw, 3.5rem); line-height: 1; letter-spacing: -.04em; }
.dashboard-hero .lead { margin: 0; font-size: 1.08rem; }
.dashboard-status { padding: 1.5rem; background: var(--accent); color: white; border-radius: .35rem; box-shadow: 0 14px 32px rgba(36,63,118,.18); }
.dashboard-status span { display: block; opacity: .75; font: .78rem/1.4 system-ui, sans-serif; text-transform: uppercase; letter-spacing: .08em; }
.dashboard-status strong { display: block; margin: .55rem 0; font-size: 1.45rem; }
.dashboard-status p { margin: 0; opacity: .82; font-family: system-ui, sans-serif; font-size: .9rem; }
.eyebrow { margin: 0; color: var(--accent); font: 700 .78rem/1.4 system-ui, sans-serif; letter-spacing: .12em; text-transform: uppercase; }
.section-heading { display: flex; justify-content: space-between; align-items: end; margin: 3rem 0 1.25rem; }
.section-heading h2, .panel h2 { margin: .2rem 0 0; font-size: 2rem; }
.metric-grid, .course-grid, .method-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.metric-grid article, .course-card, .method-grid article, .panel { padding: 1.4rem; background: var(--card); border: 1px solid var(--line); box-shadow: 0 10px 30px rgba(24,33,47,.04); }
.metric-grid span, .course-card > span { display: block; color: var(--muted); font: .82rem/1.4 system-ui, sans-serif; text-transform: uppercase; letter-spacing: .05em; }
.metric-grid strong { display: block; margin-top: .5rem; font-size: 1.45rem; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1rem; }
.page-heading { padding: 3.5rem 0 2rem; max-width: 900px; }
.page-heading h1 { font-size: clamp(2.1rem, 4vw, 3.4rem); }
.course-card h2, .course-card h3 { min-height: 3.2em; margin: .35rem 0; font-size: 1.35rem; }
.course-card p { min-height: 4.8em; color: var(--muted); }
.course-card a { font-family: system-ui, sans-serif; font-weight: 700; }
.dashboard-courses .course-card { border-top: 4px solid var(--accent); }
.dashboard-courses .course-card h3 { min-height: 2.6em; }
.course-counts { margin: 1rem 0; color: var(--muted); font-family: system-ui, sans-serif; font-size: .92rem; }
.course-counts b { margin: 0 .2rem; color: #a0a8b5; }
.primary-link { display: inline-block; padding: .55rem .8rem; background: var(--accent-soft); text-decoration: none; }
.evidence-summary { margin-top: 2.5rem; }
.overview-courses .course-card p { min-height: auto; }
.overview-courses .course-card h3 { min-height: 2.7em; }
.section-link { font: 700 .9rem/1.4 system-ui, sans-serif; }
.course-summary { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.course-summary article { padding: 1.25rem 1.4rem; background: var(--accent-soft); border-left: 4px solid var(--accent); }
.course-summary span { display: block; color: var(--muted); font: .78rem/1.4 system-ui, sans-serif; text-transform: uppercase; letter-spacing: .05em; }
.course-summary strong { display: block; margin-top: .3rem; font-size: 1.8rem; }
.empty-state, .empty-inline { padding: 1.5rem; background: var(--accent-soft); border-left: 4px solid var(--accent); }
.timeline { list-style: none; padding: 0; }
.timeline li { display: grid; grid-template-columns: 150px 1fr; gap: 1.5rem; padding: 1.5rem 0; border-top: 1px solid var(--line); }
.timeline time { color: var(--accent); font-family: system-ui, sans-serif; font-weight: 700; }
.evidence-table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: var(--card); }
th, td { padding: .85rem 1rem; border-bottom: 1px solid var(--line); text-align: left; }
th { font: 700 .78rem/1.4 system-ui, sans-serif; text-transform: uppercase; letter-spacing: .05em; }
.material-list article { display: flex; justify-content: space-between; gap: 2rem; padding: 1rem 0; border-top: 1px solid var(--line); }
.material-list span { color: var(--muted); font: .78rem system-ui, sans-serif; text-transform: uppercase; }
.course-tabs { display: flex; gap: .75rem; margin: -1rem 0 1.5rem; padding: .75rem; background: var(--card); border: 1px solid var(--line); }
.course-tabs a { padding: .45rem .7rem; background: var(--accent-soft); font-weight: 700; }
.paper-link { display: block; font-weight: 700; }
td small { display: block; margin-top: .2rem; color: var(--muted); font: .78rem/1.4 system-ui, sans-serif; }
.breadcrumb { display: flex; gap: .6rem; padding: 1.5rem 0 .5rem; color: var(--muted); font: .9rem/1.4 system-ui, sans-serif; }
.paper-heading { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(300px, .7fr); gap: 2rem; align-items: end; padding: 1.5rem 0; }
.paper-heading h1 { margin: .3rem 0 .8rem; font-size: clamp(2.1rem, 4vw, 3.7rem); line-height: 1.02; letter-spacing: -.035em; }
.paper-meta { display: grid; grid-template-columns: 1fr 1fr; margin: 0; background: var(--card); border: 1px solid var(--line); }
.paper-meta div { padding: .9rem 1rem; border-bottom: 1px solid var(--line); }
.paper-meta dt { color: var(--muted); font: .72rem/1.4 system-ui, sans-serif; text-transform: uppercase; letter-spacing: .06em; }
.paper-meta dd { margin: .2rem 0 0; font-weight: 700; }
.paper-toolbar { display: flex; justify-content: space-between; gap: 1rem; margin: 1rem 0; padding: .9rem 1rem; background: var(--accent-soft); font: 700 .9rem/1.4 system-ui, sans-serif; }
.question-list { display: grid; gap: 1.25rem; }
.question-card { padding: 1.5rem; background: var(--card); border: 1px solid var(--line); box-shadow: 0 10px 30px rgba(24,33,47,.04); }
.question-card > header { display: flex; justify-content: space-between; color: var(--accent); font: 700 .78rem/1.4 system-ui, sans-serif; letter-spacing: .08em; text-transform: uppercase; }
.question-card h2 { margin: .55rem 0 1rem; font-size: 1.55rem; }
.source-text { white-space: pre-wrap; overflow-wrap: anywhere; font-family: Georgia, "Times New Roman", serif; line-height: 1.65; }
.question-text { padding: 1rem 1.15rem; background: #fbfcfe; border-left: 4px solid var(--accent); }
.solution-panel { margin-top: 1rem; border: 1px solid #cad6ed; background: #f2f6fd; }
.solution-panel summary { padding: .9rem 1rem; cursor: pointer; color: var(--accent); font: 700 .95rem/1.4 system-ui, sans-serif; }
.solution-text { padding: 0 1rem 1rem; }
.question-evidence-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; align-items: start; }
.question-evidence-grid figure { margin: 0; }
.question-evidence-grid figcaption { padding: .65rem .8rem; color: var(--accent); background: var(--accent-soft); font: 700 .82rem/1.4 system-ui, sans-serif; text-transform: uppercase; letter-spacing: .05em; }
.paper-page-image, .paper-answer-image { display: block; width: 100%; height: auto; background: white; border: 1px solid var(--line); }
.technical-note { margin-top: 2rem; padding: 1.25rem; background: var(--accent-soft); }

@media (max-width: 760px) {
  .site-header { position: static; align-items: flex-start; flex-direction: column; gap: .75rem; }
  .metric-grid, .course-grid, .method-grid, .split, .course-summary, .dashboard-hero, .paper-heading, .question-evidence-grid { grid-template-columns: 1fr; }
  .timeline li { grid-template-columns: 1fr; gap: .25rem; }
  .material-list article { flex-direction: column; gap: .5rem; }
  .course-tabs, .paper-toolbar { flex-direction: column; }
}