/* Shared reading and navigation layer. Cyan marks actions; warm colors mark risk. */
:root {
  --bg: oklch(0.19 0.008 260);
  --bg-alt: oklch(0.215 0.009 260);
  --panel: oklch(0.245 0.009 260);
  --panel-2: oklch(0.285 0.012 260);
  --hair: oklch(0.32 0.012 260);
  --hair-strong: oklch(0.43 0.015 260);
  --text: oklch(0.89 0.008 85);
  --text-bright: oklch(0.97 0.006 85);
  --text-dim: oklch(0.75 0.014 260);
  --text-mute: oklch(0.67 0.014 260);
  --cyan: oklch(0.81 0.105 205);
  --amber: oklch(0.83 0.14 80);
  --red: oklch(0.73 0.17 25);
  --green: oklch(0.8 0.12 155);
  --ink: oklch(0.18 0.015 230);
  --r-1: 6px;
  --action-wash: oklch(0.28 0.025 215);
}
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 4px; }
input::placeholder { color: var(--text-mute); opacity: 1; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 100; background: var(--cyan); color: var(--ink); padding: 12px 20px; }
.skip-link:focus { top: 12px; }
.ix-nav-inner { height: 68px; max-width: 1320px; }
.ix-nav-logo-text { font-size: 18px; }
.ix-nav-links { height: 68px; border: 0; gap: 6px; align-items: center; }
.ix-nav-link { border: 0; border-radius: 6px; height: 40px; padding: 0 18px; font-family: var(--font-sans); font-size: 13px; font-weight: 500; letter-spacing: 0; text-transform: none; color: var(--text-dim); }
.ix-nav-link.active { background: var(--action-wash); color: var(--cyan); box-shadow: none; }
.ix-nav-link:hover { background: var(--panel); color: var(--text-bright); }
.mobile-nav-links { padding: 8px 16px; }
.mobile-nav-links a { display: block; padding: 12px; color: var(--text); font-size: 15px; }
.ix-nav-toggle { min-height: 44px; min-width: 44px; }
.ix-btn { min-height: 42px; border-radius: 6px; font-family: var(--font-sans); font-size: 13px; letter-spacing: 0; text-transform: none; gap: 14px; transition: background 180ms ease-out, border-color 180ms ease-out; }
.ix-btn-primary { background: var(--cyan); color: var(--ink); border-color: var(--cyan); font-weight: 600; }
.ix-btn-primary:hover { background: oklch(0.88 0.07 205); color: var(--ink); }
.ix-btn-secondary:hover { background: var(--panel-2); }
.ix-page-header { background-image: none; padding-top: 38px; padding-bottom: 28px; }
.ix-h1 { font-size: 40px; line-height: 1.12; }
.ix-eyebrow, .ix-chrome { letter-spacing: 0.08em; }
.ix-section-header { background: var(--panel); }
.ix-section-name { font-family: var(--font-sans); font-weight: 600; }
.ix-filter-label, .ix-col-head { color: var(--text-dim); }
.ix-table thead th { color: var(--text-dim); }
.ix-table tbody tr:hover { background: var(--panel); }
.ui-kicker { font-size: 11px; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-dim); margin: 0 0 14px; }
.ui-lead { color: var(--text-dim); font-size: 16px; line-height: 1.7; max-width: 62ch; }
.ui-tag { display: inline-flex; padding: 4px 9px; border: 1px solid oklch(0.43 0.05 205); border-radius: 4px; font-size: 11px; font-weight: 600; color: var(--cyan); background: var(--action-wash); white-space: nowrap; }
.workspace-home { max-width: 1280px; padding: 0 28px 40px; margin: auto; }
.home-intro { display: flex; align-items: flex-end; justify-content: space-between; gap: 40px; padding: 52px 0 36px; }
.home-intro h1 { font-family: var(--font-disp); font-size: 44px; line-height: 1.12; letter-spacing: -0.035em; font-weight: 500; margin: 0 0 18px; color: var(--text-bright); }
.home-purpose { padding-bottom: 7px; color: var(--text-mute); font-size: 12px; text-align: right; line-height: 1.8; flex-shrink: 0; }
.home-workspace { display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: start; }
.start-panel { background: var(--panel); border: 1px solid var(--hair-strong); border-radius: 12px; padding: 28px; }
.start-panel-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 22px; }
.start-panel-top .ui-kicker { margin: 0; }
.start-panel h2, .research-panel h2, .home-next-path h2, .foundation-entry h2 { font-size: 26px; line-height: 1.25; font-family: var(--font-disp); font-weight: 500; color: var(--text-bright); letter-spacing: -0.02em; margin: 0 0 12px; }
.start-panel > p, .research-panel > p:not(.ui-kicker), .foundation-entry p { font-size: 14px; color: var(--text-dim); line-height: 1.7; max-width: 60ch; }
.start-sequence { margin: 24px 0; padding: 0; list-style: none; }
.start-sequence li + li { border-top: 1px solid var(--hair); }
.start-sequence a { display: flex; align-items: center; gap: 16px; padding: 15px 0; color: var(--text); text-decoration: none; transition: color 180ms ease-out; }
.start-sequence a:hover { color: var(--cyan); }
.start-sequence a > span:nth-child(2) { flex: 1; font-weight: 500; font-size: 14px; }
.sequence-number { font-family: var(--font-num); color: var(--text-mute); font-size: 13px; }
.start-sequence small { display: block; font-size: 11px; color: var(--text-mute); font-weight: 400; margin-top: 4px; }
.quiet-link { color: var(--text-dim); font-size: 12px; margin-left: 14px; display: inline-block; margin-top: 12px; }
.quiet-link:hover { color: var(--cyan); }
.research-panel { padding-top: 4px; min-width: 0; }
.research-panel .home-search-shell { margin: 24px 0 12px; border: 1px solid var(--hair-strong); border-radius: 8px; background: var(--panel); overflow: hidden; }
.research-panel .home-search-meta { background: none; padding: 12px 16px 0; border: 0; font-size: 10px; color: var(--text-mute); }
.research-panel .home-search-control { min-height: 60px; padding: 4px 16px 12px; gap: 10px; }
.research-panel #hero-search { font-family: var(--font-sans); font-size: 15px; font-weight: 400; }
.research-panel .home-search-results { margin-bottom: 16px; max-height: 320px; overflow-y: auto; }
.workspace-route { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 20px 2px; border-bottom: 1px solid var(--hair); color: var(--text); text-decoration: none; }
.workspace-route strong { display: block; font-size: 15px; font-weight: 500; }
.workspace-route small { display: block; font-size: 12px; color: var(--text-dim); margin-top: 5px; }
.workspace-route > span:last-child { color: var(--text-mute); transition: transform 180ms ease-out; }
.workspace-route:hover strong, .workspace-route:hover > span:last-child { color: var(--cyan); }
.workspace-route:hover > span:last-child { transform: translate(2px, -2px); }
.home-next-path { display: grid; grid-template-columns: 1fr 1.4fr; gap: 32px; padding: 36px 0; margin-top: 32px; border-top: 1px solid var(--hair); }
.home-next-path nav { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 24px; align-content: start; }
.home-next-path nav a { color: var(--text-dim); padding: 9px 0; font-size: 13px; }
.home-next-path nav a:hover { color: var(--cyan); }
.education-note { color: var(--text-mute); font-size: 12px; line-height: 1.7; padding: 18px 0; border-top: 1px solid var(--hair); margin-top: 20px; }
.education-note a { color: var(--text-dim); margin-left: 8px; text-decoration: underline; text-underline-offset: 3px; }
.context-guide { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; font-size: 12px; padding: 14px 0 22px; color: var(--text-dim); }
.context-guide a { color: var(--cyan); }
.context-guide-note { margin-left: auto; color: var(--text-mute); }
.learning-hub { max-width: 1160px; }
.ui-page-heading { padding: 44px 0 30px; }
.ui-page-heading h1 { font-family: var(--font-disp); font-size: 40px; line-height: 1.15; letter-spacing: -0.03em; color: var(--text-bright); margin: 0 0 14px; }
.foundation-entry { display: flex; align-items: center; justify-content: space-between; gap: 30px; border: 1px solid var(--hair-strong); background: var(--panel); border-radius: 10px; padding: 24px 28px; }
.foundation-entry .ui-tag { margin-bottom: 14px; }
.foundation-entry .ix-btn { flex-shrink: 0; }
.curriculum-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin: 38px 0 18px; }
.curriculum-toolbar h2 { font-size: 20px; font-weight: 500; color: var(--text-bright); }
.curriculum-toolbar > div { display: flex; align-items: center; gap: 14px; }
.curriculum-toolbar input { width: 290px; max-width: 100%; padding: 10px 14px; border: 1px solid var(--hair-strong); border-radius: 6px; background: var(--panel); font-size: 13px; color: var(--text); }
#lesson-search-status { font-size: 11px; color: var(--text-dim); }
.curriculum-track { border-top: 1px solid var(--hair); scroll-margin-top: 85px; }
.curriculum-track:last-child { border-bottom: 1px solid var(--hair); }
.curriculum-track > summary { display: flex; align-items: center; gap: 22px; cursor: pointer; padding: 24px 10px; list-style: none; }
.curriculum-track > summary::-webkit-details-marker, .lesson-outline summary::-webkit-details-marker { display: none; }
.track-number { font-family: var(--font-num); font-size: 14px; color: var(--text-mute); }
.track-summary { flex: 1; min-width: 0; }
.track-summary strong { display: block; font-weight: 500; font-size: 18px; color: var(--text-bright); margin-bottom: 6px; }
.track-summary > span { display: block; color: var(--text-dim); font-size: 12px; line-height: 1.6; max-width: 70ch; }
.track-meta { color: var(--text-dim); font-size: 12px; text-align: right; flex-shrink: 0; }
.track-meta > span { display: block; color: var(--text-mute); font-size: 11px; margin-top: 5px; }
.track-toggle { font-size: 24px; color: var(--text-mute); width: 24px; text-align: center; transition: transform 180ms ease-out; }
.curriculum-track[open] > summary .track-toggle { transform: rotate(45deg); color: var(--cyan); }
.curriculum-track[open] > summary .track-number { color: var(--cyan); }
.curriculum-track > summary:hover { background: var(--panel); }
.track-content { background: var(--bg-alt); border: 1px solid var(--hair); border-radius: 8px; margin: 0 0 24px 46px; overflow: hidden; }
.track-content .lesson-group { border: 0; }
.track-content .lesson-group-header { padding: 16px 20px; background: var(--panel); }
.track-content .lesson-group-title { color: var(--text-dim); font-family: var(--font-sans); font-size: 13px; letter-spacing: 0; text-transform: none; }
.track-content .lesson-group-desc { font-size: 12px; }
.lesson-row { gap: 18px; padding: 16px 20px; }
.lesson-row-copy { flex: 1; min-width: 0; }
.lesson-title { font-family: var(--font-sans); font-size: 14px; font-weight: 500; }
.lesson-summary { color: var(--text-dim); font-size: 12px; line-height: 1.6; margin-top: 5px; }
.lesson-time { font-size: 11px; color: var(--text-mute); }
.lesson-idx { color: var(--text-mute); }
.lesson-row:hover { background: var(--panel); }
.lesson-wrap { max-width: 1200px; grid-template-columns: minmax(0, 760px) 260px; gap: 48px; }
.lesson-article { min-width: 0; }
.lesson-location { display: flex; justify-content: space-between; gap: 16px; font-size: 12px; color: var(--text-dim); margin-bottom: 12px; }
.lesson-location a { color: var(--cyan); }
#reading-progress { display: block; width: 100%; height: 3px; margin-bottom: 24px; appearance: none; border: 0; background: var(--hair); }
#reading-progress::-webkit-progress-bar { background: var(--hair); }
#reading-progress::-webkit-progress-value { background: var(--cyan); }
#reading-progress::-moz-progress-bar { background: var(--cyan); }
.lesson-outline { background: var(--panel); border: 1px solid var(--hair); border-radius: 6px; margin: 0 0 28px; }
.lesson-outline summary { padding: 14px 18px; cursor: pointer; font-size: 13px; color: var(--text); }
.lesson-outline summary::after { content: '+'; float: right; color: var(--cyan); }
.lesson-outline[open] summary::after { content: '−'; }
#lesson-outline-links { display: grid; gap: 0; padding: 0 18px 12px; }
#lesson-outline-links a { font-size: 13px; color: var(--text-dim); padding: 7px 0; }
#lesson-outline-links a:hover { color: var(--cyan); }
.lesson-body { font-size: 16px; line-height: 1.8; max-width: 70ch; }
.lesson-body h2 { font-size: 24px; margin-top: 36px; scroll-margin-top: 90px; }
.lesson-body h3 { font-size: 19px; scroll-margin-top: 90px; }
.lesson-sidebar { position: sticky; top: 92px; max-height: calc(100vh - 116px); overflow-y: auto; }
.sidebar-block { border-radius: 6px; overflow: hidden; }
.sidebar-link { font-family: var(--font-sans); line-height: 1.6; }
.sidebar-link.active { background: var(--action-wash); color: var(--cyan); border-left: 0; }
.lesson-nav-link { padding: 20px; }
.lesson-nav-link:has(.lesson-nav-label) { min-width: 0; }
.lesson-nav-title { overflow-wrap: anywhere; }
.track-finish { flex: 1; background: var(--action-wash); }
@media (max-width: 900px) {
  .home-workspace { gap: 24px; }
  .home-purpose { display: none; }
  .start-panel { padding: 22px; }
  .home-next-path { grid-template-columns: 1fr; gap: 12px; }
  .lesson-wrap { grid-template-columns: minmax(0, 1fr); }
  .lesson-sidebar { display: none; }
}
@media (max-width: 640px) {
  .workspace-home { padding: 0 20px 24px; }
  .home-intro { padding: 32px 0 26px; }
  .home-intro h1 { font-size: 34px; }
  .ui-lead { font-size: 14px; }
  .home-workspace { grid-template-columns: 1fr; gap: 32px; }
  .start-panel h2, .research-panel h2 { font-size: 25px; }
  .home-next-path nav { grid-template-columns: 1fr; gap: 0; }
  .quiet-link { margin-left: 0; display: block; }
  .home-next-path { margin-top: 28px; padding: 26px 0; }
  .ix-h1, .ui-page-heading h1 { font-size: 32px; }
  .foundation-entry { align-items: flex-start; flex-direction: column; padding: 22px; gap: 18px; }
  .curriculum-toolbar { align-items: stretch; flex-direction: column; gap: 14px; }
  .curriculum-toolbar > div { flex-wrap: wrap; }
  .curriculum-toolbar input { width: 100%; }
  .curriculum-track > summary { gap: 12px; padding: 22px 0; flex-wrap: wrap; }
  .track-summary strong { font-size: 16px; }
  .track-summary > span { font-size: 12px; }
  .track-meta { display: none; }
  .track-content { margin-left: 0; }
  .lesson-row { padding: 15px 12px; gap: 10px; flex-wrap: nowrap; }
  .lesson-summary { display: none; }
  .lesson-time { font-size: 10px; }
  .lesson-idx { font-size: 11px; width: 20px; flex-shrink: 0; }
  .lesson-title { font-size: 13px; }
  .lesson-arrow { display: none; }
  .lesson-body { font-size: 15px; }
  .lesson-nav-link { padding: 14px; }
  .context-guide-note { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}
.lesson-outline summary { list-style: none; }
.compound-reading-links { padding: 0 18px 16px; display: grid; gap: 10px; }
.compound-reading-links a { color: var(--text-dim); font-size: 13px; }
.compound-reading-links a:hover { color: var(--cyan); }
.compound-reading-links small { color: var(--text-mute); margin-left: 8px; }
.builder-heading { max-width: 1280px; margin: auto; padding-left: 24px; padding-right: 24px; }
.builder-heading .context-guide { padding-bottom: 0; }
.tools-workspace { max-width: 1160px; margin: auto; padding: 0 24px 40px; }
.tool-directory { border-top: 1px solid var(--hair); }
.tool-directory-row { display: flex; align-items: center; gap: 28px; padding: 30px 12px; border-bottom: 1px solid var(--hair); text-decoration: none; transition: background 180ms ease-out; }
.tool-directory-row:hover { background: var(--panel); }
.tool-kind { width: 100px; flex-shrink: 0; font-family: var(--font-mono); font-size: 11px; color: var(--text-mute); }
.tool-copy { flex: 1; }
.tool-copy h2 { font-size: 21px; font-family: var(--font-disp); color: var(--text-bright); margin-bottom: 8px; }
.tool-copy p { font-size: 13px; color: var(--text-dim); line-height: 1.7; max-width: 65ch; }
.tool-status { font-size: 11px; color: var(--text-mute); }
.tool-open { font-size: 24px; color: var(--cyan); }
@media (max-width: 640px) {
  .tool-directory-row { flex-wrap: wrap; gap: 12px; padding: 22px 0; }
  .tool-kind { width: 100%; }
  .tool-copy { flex-basis: 80%; }
  .tool-status { order: 1; }
}
.disclaimer-notice { max-width: 1232px; margin: 18px auto 0; padding: 16px 22px; display: flex; align-items: center; justify-content: space-between; gap: 22px; border: 1px solid var(--hair); border-radius: 6px; background: var(--panel); }
.disclaimer-notice strong { font-size: 13px; font-weight: 500; }
.disclaimer-notice p { font-size: 12px; color: var(--text-dim); max-width: 70ch; margin-top: 4px; }
.disclaimer-notice button { flex-shrink: 0; }
@media (max-width: 640px) { .disclaimer-notice { margin: 16px; flex-direction: column; align-items: flex-start; gap: 12px; } }