:root {
  --ink: #f4f2eb;
  --ink-2: #111111;
  --panel: #151515;
  --paper: #f3f0e7;
  --paper-2: #dedbd2;
  --muted: #aaa9a2;
  --text-secondary: #c9c8c1;
  --text-tertiary: #aaa9a2;
  --accent: #dfff3f;
  --accent-2: #dfff3f;
  --blue: #dfff3f;
  --green: #dfff3f;
  --red: #ff705c;
  --line: rgba(244,242,235,.20);
  --line-strong: rgba(244,242,235,.34);
  --paper-line: rgba(10,10,10,.22);
  --sidebar: 184px;
  --radius: 0px;
  color: var(--ink);
  background: #0a0a0a;
  font-family: Arial, Helvetica, sans-serif;
}

html, body { background: #0a0a0a; color: var(--ink); }
body { overflow-x: hidden; }
a { color: inherit; }

*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

/* FRAME */
.sidebar {
  width: var(--sidebar);
  padding: 26px 20px 22px;
  border-right: 1px solid var(--line);
  background: #0a0a0a;
}
.brand { align-items: flex-start; gap: 10px; }
.brand-mark {
  width: 46px;
  height: 46px;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  font: 700 11px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
}
.brand strong { color: var(--ink); font-size: 20px; letter-spacing: -.06em; }
.brand small { color: var(--text-tertiary); font: 600 9px/1.35 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .14em; }
.main-nav { margin-top: 76px; gap: 0; border-top: 1px solid var(--line); }
.main-nav a {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 8px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 650;
}
.main-nav a span { color: var(--text-tertiary); font: 600 10px ui-monospace, SFMono-Regular, Menlo, monospace; }
.main-nav a:hover, .main-nav a.active { color: var(--ink); }
.main-nav a.active { box-shadow: inset 3px 0 0 var(--accent); padding-left: 10px; }
.main-nav a.active span { color: var(--accent); }
.sidebar-progress { margin-top: auto; padding: 14px 0 0; border: 0; border-top: 1px solid var(--line); border-radius: 0; background: transparent; }
.sidebar-progress .label-row { color: var(--text-tertiary); font: 10px ui-monospace, SFMono-Regular, Menlo, monospace; }
.progress-track { height: 2px; margin-top: 10px; border-radius: 0; background: #2a2a28; }
.progress-fill { border-radius: 0; background: var(--accent); }
.sidebar-note { margin: 20px 0 0; color: var(--text-tertiary); font: 10px/1.55 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .05em; text-transform: uppercase; }

main { margin-left: var(--sidebar); background: #0a0a0a; }
.page { max-width: 1460px; padding: 46px 54px 120px; animation: editorial-enter .32s cubic-bezier(.2,.7,.2,1); }
@keyframes editorial-enter { from { opacity: 0; transform: translateY(10px); } }

/* TYPE */
.eyebrow {
  margin-bottom: 14px;
  color: var(--accent);
  font: 700 11px/1.35 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: .13em;
  text-transform: uppercase;
}
h1, h2, h3 { color: var(--ink); font-family: Arial, Helvetica, sans-serif; }
h1 { font-weight: 800; letter-spacing: -.08em; line-height: .88; }
h2 { font-weight: 760; letter-spacing: -.055em; line-height: .98; }
h3 { font-weight: 720; letter-spacing: -.03em; }
.lead { max-width: 780px; color: var(--text-secondary); font-size: clamp(18px, 1.7vw, 23px); line-height: 1.5; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.muted { color: var(--text-tertiary); }
.accent { color: var(--accent); }
.section { margin-top: 108px; }
.section-heading { align-items: end; padding-top: 16px; border-top: 1px solid var(--line); }
.section-heading p { max-width: 520px; color: var(--text-secondary); line-height: 1.55; }

/* HERO */
.hero { position: relative; min-height: 72vh; padding: 18px 0 36px; display: flex; flex-direction: column; justify-content: space-between; }
.hero::after {
  display: block;
  content: "PM / 0.1";
  position: absolute;
  top: 18px;
  right: 0;
  color: #4b4b47;
  writing-mode: vertical-rl;
  font: 700 10px ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: .2em;
}
.hero h1 { max-width: 1100px; margin: 0 0 24px; font-size: clamp(68px, 10.6vw, 158px); }
.hero .lead { margin-top: auto; }
.hero-actions { gap: 0; margin-top: 30px; }

.button {
  min-height: 46px;
  padding: 0 17px;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  box-shadow: none;
  font: 700 11px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.button:hover { border-color: var(--ink); background: var(--ink); color: #0a0a0a; }
.button.primary { border-color: var(--accent); background: var(--accent); color: #0a0a0a; }
.button.primary:hover { border-color: var(--ink); background: var(--ink); color: #0a0a0a; }
.button.subtle { min-height: 38px; padding: 0 12px; color: var(--ink); }
.button.subtle:hover { border-color: var(--accent); background: transparent; color: var(--accent); }
.button:disabled { opacity: .48; cursor: not-allowed; }

/* READOUTS */
.stat-grid { grid-template-columns: repeat(4, 1fr); gap: 0; margin-top: 66px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stat { min-height: 120px; padding: 18px 18px 16px 0; border-right: 1px solid var(--line); background: transparent; }
.stat + .stat { padding-left: 18px; }
.stat:last-child { border-right: 0; }
.stat strong { color: var(--ink); font-size: clamp(30px, 4vw, 54px); letter-spacing: -.07em; }
.stat span { color: var(--text-tertiary); font: 10px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; text-transform: uppercase; }
.system-map { grid-template-columns: repeat(7, 1fr); gap: 0; border-top: 1px solid var(--line); }
.system-node { min-height: 148px; padding: 14px 12px 16px; border: 0; border-right: 1px solid var(--line); border-radius: 0; background: transparent; box-shadow: none; }
.system-node:last-child { border-right: 0; }
.system-node::before { content: ""; display: block; width: 100%; height: 2px; margin-bottom: 12px; background: var(--node); }
.system-node span { color: var(--text-tertiary); font: 600 10px ui-monospace, SFMono-Regular, Menlo, monospace; }
.system-node strong { margin-top: 42px; color: var(--ink); font-size: 13px; line-height: 1.3; }

/* NEXT ACTION */
.next-card { grid-template-columns: 1.45fr .55fr; border: 0; border-radius: 0; background: var(--accent); color: #0a0a0a; box-shadow: none; }
.next-card > div { padding: clamp(28px, 5vw, 64px); }
.next-card h2 { color: #0a0a0a; font-size: clamp(42px, 6vw, 82px); }
.next-card p { color: #20201d; }
.next-card .eyebrow { color: #0a0a0a !important; }
.next-card .next-meta { border-left: 1px solid rgba(10,10,10,.35); }
.next-card .button { align-self: stretch; border-color: #0a0a0a; color: #0a0a0a; }
.next-card .button:hover { background: #0a0a0a; color: var(--accent); }

/* MODULES AS CHAPTERS */
.module-grid { display: grid; grid-template-columns: 1fr; gap: 0; border-top: 1px solid var(--line); }
.module-card { min-height: 220px; padding: 28px 0 34px 170px; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; background: transparent; box-shadow: none; }
.module-card::after { right: auto; left: 0; bottom: 12px; color: #292925; font-size: 118px; font-weight: 850; letter-spacing: -.1em; }
.module-card .module-kicker { color: var(--accent); font: 700 10px ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .08em; }
.module-card h3 { max-width: 720px; margin: 18px 0 10px; color: var(--ink); font-size: clamp(34px, 4vw, 60px); }
.module-card p { max-width: 720px; color: var(--text-secondary); font-size: 16px; line-height: 1.55; }
.module-footer { inset: auto 0 26px 170px; }
.module-footer a { color: var(--ink); font: 700 11px ui-monospace, SFMono-Regular, Menlo, monospace; text-transform: uppercase; }
.module-footer a:hover { color: var(--accent); }

/* COURSE */
.course-intro { grid-template-columns: minmax(0, 1.45fr) minmax(220px, .55fr); gap: 56px; align-items: end; }
.course-intro h1 { font-size: clamp(62px, 8.6vw, 132px); }
.course-metrics { padding: 0 0 0 18px; border: 0; border-left: 1px solid var(--line); border-radius: 0; background: transparent; box-shadow: none; }
.course-metrics strong { color: var(--accent); font-size: 36px; }
.course-metrics p { color: var(--text-tertiary); font: 10px ui-monospace, SFMono-Regular, Menlo, monospace; text-transform: uppercase; }
.path-note { display: grid; grid-template-columns: 180px repeat(4, 1fr); gap: 0; margin-top: 56px; padding: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); border-radius: 0; background: transparent; color: var(--ink); font-size: 12px; }
.path-note strong, .path-note span { padding: 15px 12px; border-right: 1px solid var(--line); }
.path-note span:last-child { border-right: 0; }
.path-note strong { color: var(--accent); font: 700 10px ui-monospace, SFMono-Regular, Menlo, monospace; text-transform: uppercase; }
.path-note span { color: var(--text-secondary); }
.module-list { gap: 0; margin-top: 34px; border-top: 1px solid var(--line); }
.module-row { min-height: 138px; padding: 20px 0; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; background: transparent; box-shadow: none; grid-template-columns: 86px minmax(240px,.9fr) 1.2fr 130px; }
.module-row.current { box-shadow: inset 4px 0 0 var(--accent); padding-left: 16px; }
.module-row.completed { opacity: .72; }
.module-index { color: var(--text-tertiary); font: 650 11px ui-monospace, SFMono-Regular, Menlo, monospace; }
.module-status { color: var(--text-tertiary); font: 700 10px ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .08em; text-transform: uppercase; }
.module-row.current .module-status { color: var(--accent); }
.module-row h2 { color: var(--ink); font-size: clamp(25px, 2.4vw, 38px); }
.module-row p { color: var(--text-secondary); font-size: 15px; line-height: 1.5; }
.module-row a { color: var(--ink); font: 700 10px ui-monospace, SFMono-Regular, Menlo, monospace; text-transform: uppercase; }
.module-row a:hover { color: var(--accent); }

/* LESSON */
.lesson-layout { grid-template-columns: minmax(0, 860px) 220px; gap: 64px; }
.lesson-layout > article { padding: 0; border: 0; border-radius: 0; background: transparent; box-shadow: none; }
.lesson-header { margin-bottom: 54px; padding: 10px 0 38px; border-bottom: 1px solid var(--line); }
.lesson-header h1 { font-size: clamp(56px, 7vw, 104px); }
.lesson-header .meta { color: var(--text-tertiary); font: 10px ui-monospace, SFMono-Regular, Menlo, monospace; text-transform: uppercase; }
.lesson-block { margin: 60px 0; }
.lesson-block h2 { margin-bottom: 20px; font-size: clamp(32px, 3vw, 48px); }
.lesson-block p, .lesson-block li { color: var(--text-secondary); font-size: 18px; line-height: 1.68; }
.insight { margin: 50px 0; padding: 24px 0 24px 24px; border-left: 3px solid var(--accent); background: transparent; color: var(--ink); font-size: clamp(24px, 2.5vw, 36px); font-weight: 700; line-height: 1.25; }
.model-card { margin: 36px 0; padding: 24px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); border-radius: 0; background: transparent; color: var(--accent); font: 13px/1.9 ui-monospace, SFMono-Regular, Menlo, monospace; }
.practice { margin-top: 70px; padding: 34px; border: 0; border-radius: 0; background: var(--paper); color: #111; }
.practice h2, .practice h3 { color: #111; }
.practice .eyebrow { color: #111; }
.practice-help, .field-help { color: #4f4f4a; font-size: 14px; }
.criterion { padding: 13px 0; border: 0; border-bottom: 1px solid rgba(10,10,10,.18); border-radius: 0; background: transparent; }
.criterion input { accent-color: #111; }
.completion-status { color: #4f4f4a; font: 700 11px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; text-transform: uppercase; }
.completion-status.ready { color: #111; }
.notes { border: 1px solid rgba(10,10,10,.28); border-radius: 0; background: #fff; color: #111; font-size: 16px; }
.notes:focus { outline: 2px solid #111; border-color: #111; }
.practice .button { border-color: #111; color: #111; }
.practice .button.primary { border-color: #111; background: #111; color: var(--paper); }
.lesson-aside { top: 28px; }
.lesson-aside .toc { padding: 0; border: 0; border-top: 1px solid var(--line); border-radius: 0; background: transparent; }
.toc small { display: block; padding: 13px 0; border-bottom: 1px solid var(--line); color: var(--text-tertiary); font: 700 9px ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .08em; }
.toc a { padding: 11px 0; border-bottom: 1px solid var(--line); color: var(--text-secondary); font-size: 12px; }
.toc a:hover { color: var(--accent); }
.lesson-nav { gap: 0; margin-top: 24px; }

/* M01 LEARNING LAB */
.learning-lab {
  margin-top: 10px;
  border-top: 1px solid var(--line);
  color: var(--ink);
}
.learning-lab > section,
.learning-lab > header {
  padding: 42px 0;
  border-bottom: 1px solid var(--line);
}
.lab-intro h2,
.lab-drill h2,
.lab-worked h2,
.lab-technique h2,
.lab-workbook h2,
.lab-transfer h2 { font-size: clamp(30px, 3.4vw, 52px); }
.lab-intro > p:last-child,
.lab-purpose,
.lab-situation,
.lab-worked li,
.lab-technique li,
.lab-workbook > p,
.lab-transfer p {
  color: var(--text-secondary);
  font-size: 17px;
  line-height: 1.65;
}
.lab-step {
  margin-bottom: 14px;
  color: var(--accent);
  font: 700 10px ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: .10em;
  text-transform: uppercase;
}
.lab-drill fieldset { margin-top: 24px; padding: 0; border: 0; }
.lab-drill legend { margin-bottom: 14px; color: var(--ink); font-size: 18px; font-weight: 700; line-height: 1.45; }
.lab-options { display: grid; border-top: 1px solid var(--line); }
.lab-option {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 12px;
  align-items: start;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.45;
  cursor: pointer;
}
.lab-option:hover { color: var(--ink); }
.lab-option:has(input:checked) { color: var(--ink); box-shadow: inset 3px 0 0 var(--accent); padding-left: 12px; }
.lab-option input { margin-top: 3px; accent-color: var(--accent); }
.lab-feedback {
  margin-top: 18px;
  padding: 18px 20px;
  border-left: 3px solid var(--text-tertiary);
  background: #141414;
  color: var(--text-secondary);
}
.lab-feedback strong { display: block; margin-bottom: 7px; color: var(--ink); font-size: 15px; }
.lab-feedback p { margin: 0; color: var(--text-secondary); font-size: 16px; line-height: 1.55; }
.lab-feedback.strong { border-left-color: var(--accent); }
.lab-feedback.needs-work { border-left-color: var(--red); }
.lab-worked ol,
.lab-technique ol { padding-left: 22px; }
.lab-worked li,
.lab-technique li { margin: 9px 0; }
.lab-model {
  margin-top: 26px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--accent);
  font: 700 13px/1.7 ui-monospace, SFMono-Regular, Menlo, monospace;
}
.lab-workbook {
  margin-inline: -28px;
  padding: 42px 28px !important;
  background: var(--paper);
  color: #111;
}
.lab-workbook h2 { color: #111; }
.lab-workbook .lab-step { color: #111; }
.lab-workbook > p { color: #42423e; }
.lab-fields { display: grid; gap: 0; margin-top: 28px; border-top: 1px solid rgba(10,10,10,.22); }
.lab-field { display: grid; gap: 7px; padding: 18px 0; border-bottom: 1px solid rgba(10,10,10,.22); }
.lab-field strong { color: #111; font-size: 16px; }
.lab-field span { color: #4c4c47; font-size: 14px; line-height: 1.45; }
.lab-field textarea {
  width: 100%;
  min-height: 88px;
  margin-top: 5px;
  padding: 12px;
  border: 1px solid rgba(10,10,10,.30);
  border-radius: 0;
  background: #fff;
  color: #111;
  font: 16px/1.5 Arial, Helvetica, sans-serif;
  resize: vertical;
}
.lab-field textarea:focus-visible { outline-color: #111; }
.lab-transfer { background: transparent; }
.lab-finish { padding-top: 34px !important; }
.lab-finish .completion-status { color: var(--text-secondary); }
.lab-finish .completion-status.ready { color: var(--accent); }
.lab-finish .field-help { display: block; margin: 5px 0 10px; color: var(--text-tertiary); }
.lab-finish .notes { background: #111; color: var(--ink); border-color: var(--line-strong); }
.lab-finish .notes:focus-visible { outline-color: var(--accent); }

/* DIAGNOSTIC / TOOLS */
.question-card, .tool-card, .principle { border: 0; border-bottom: 1px solid var(--line); border-radius: 0; background: transparent; color: var(--ink); box-shadow: none; }
.question-card { padding: 22px 0; }
.question-card legend, .tool-card h3, .principle strong { color: var(--ink); }
.option { border: 1px solid var(--line-strong); border-radius: 0; color: var(--text-secondary); background: transparent; }
.option:has(input:checked) { border-color: var(--accent); background: rgba(223,255,63,.08); color: var(--ink); }
.option input { accent-color: var(--accent); }
.diagnostic-result { border: 1px solid var(--line); border-radius: 0; background: #111; color: var(--ink); box-shadow: none; }
.result-empty, .tool-card p, .principle p { color: var(--text-secondary); }
.tool-grid { gap: 0; border-top: 1px solid var(--line); }
.tool-card { min-height: 260px; padding: 26px 22px 26px 0; }

/* VALIDATION */
.validation-shell { max-width: 980px; }
.validation-hero { border-bottom-color: var(--line); }
.validation-note { border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 0; background: transparent; color: var(--text-secondary); }
.validation-step { border: 0; border-top: 1px solid var(--line); border-radius: 0; background: transparent; color: var(--ink); box-shadow: none; padding: 30px 0; }
.validation-step > header p { color: var(--text-secondary); }
.validation-scenario { border-radius: 0; background: #151515; color: var(--text-secondary); }
.validation-option { border-color: var(--line-strong); border-radius: 0; color: var(--text-secondary); background: transparent; }
.validation-option:has(input:checked) { border-color: var(--accent); background: rgba(223,255,63,.08); color: var(--ink); }
.validation-option input { accent-color: var(--accent); }
.validation-feedback { color: var(--text-secondary); }
.validation-reasoning, .validation-evidence textarea { border: 1px solid var(--line-strong); border-radius: 0; background: #111; color: var(--ink); }
.validation-state { border-color: var(--line); border-radius: 0; color: var(--text-secondary); }

/* MOBILE */
@media (max-width: 1050px) {
  .system-map { grid-template-columns: repeat(4, 1fr); }
  .lesson-layout { grid-template-columns: minmax(0, 760px); }
  .lesson-aside { position: static; order: -1; }
  .lesson-aside .toc { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 900px) {
  :root { --sidebar: 0px; }
  .sidebar { display: none; }
  main { margin-left: 0; }
  .mobile-header { display: flex; height: 62px; padding: 0 16px; border-bottom: 1px solid var(--line); background: #0a0a0a; }
  .mobile-header .brand-mark { width: 34px; height: 34px; }
  .menu-button { border: 1px solid var(--line-strong); border-radius: 0; color: var(--ink); background: transparent; }
  .mobile-nav { background: #0a0a0a; border-bottom: 1px solid var(--line); }
  .mobile-nav a { border-bottom: 1px solid var(--line); color: var(--ink); }
  .page { padding: 34px 18px 80px; }
  .hero { min-height: auto; }
  .hero h1 { font-size: clamp(58px, 17vw, 92px); }
  .stat-grid { grid-template-columns: repeat(2,1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .system-map { grid-template-columns: repeat(2,1fr); }
  .system-node { border-bottom: 1px solid var(--line); }
  .next-card { grid-template-columns: 1fr; }
  .next-card .next-meta { border-left: 0; border-top: 1px solid rgba(10,10,10,.35); }
  .module-card { padding-left: 88px; }
  .module-card::after { font-size: 70px; }
  .module-footer { left: 88px; }
  .course-intro { grid-template-columns: 1fr; }
  .path-note { grid-template-columns: 1fr; }
  .path-note strong, .path-note span { border-right: 0; border-bottom: 1px solid var(--line); }
  .module-row { grid-template-columns: 48px 1fr; gap: 8px 14px; }
  .module-row p, .module-row a { grid-column: 2; text-align: left; }
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-aside { position: static; }
  .learning-lab > section, .learning-lab > header { padding: 34px 0; }
  .lab-workbook { margin-inline: -18px; padding: 34px 18px !important; }
}

@media (max-width: 620px) {
  .lesson-header h1 { font-size: clamp(48px, 15vw, 78px); }
  .lab-intro > p:last-child, .lab-purpose, .lab-situation, .lab-worked li, .lab-technique li, .lab-workbook > p, .lab-transfer p { font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .page { animation: none; }
  * { scroll-behavior: auto !important; transition: none !important; }
}