:root {
  --paper: #f4f2ec; --paper-raised: #fbfaf6; --ink: #17201c; --body-text: #303733; --muted: #68706b;
  --line: #d7d9d2; --accent: #d5f45d; --accent-deep: #8caa16; --forest: #193f35;
  --code: #13231e; --code-ink: #dce9df; --danger: #b85243; --shadow: 0 20px 60px rgba(26, 38, 33, .10);
  --sidebar: 304px; --topbar: 66px; --radius: 14px; --control: 40px; --icon: 18px;
}
[data-theme="dark"] { --paper: #121815; --paper-raised: #18211d; --ink: #edf2ec; --body-text: #d4ddd7; --muted: #9ca9a2; --line: #2c3933; --accent: #c9ed54; --accent-deep: #b6d948; --forest: #b9ddd1; --code: #0b110f; --code-ink: #d9e8dd; --shadow: 0 20px 60px rgba(0, 0, 0, .3); }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 15px/1.7 "Manrope", sans-serif; -webkit-font-smoothing: antialiased; }
button, input, textarea { font: inherit; }
button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible { outline: 2px solid var(--accent-deep); outline-offset: 3px; }
a { color: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; z-index: 100; left: 16px; top: -60px; background: var(--accent); color: #17201c; padding: 10px 16px; border-radius: 8px; transition: top .2s; }
.skip-link:focus { top: 12px; }
.app-shell { min-height: 100vh; }
.course-sidebar { position: fixed; inset: 0 auto 0 0; z-index: 20; width: var(--sidebar); background: var(--paper-raised); border-right: 1px solid var(--line); display: flex; flex-direction: column; overflow-y: auto; }
.brand-block { height: var(--topbar); padding: 0 20px; display: flex; align-items: center; border-bottom: 1px solid var(--line); }
.brand { display: flex; gap: 11px; align-items: center; text-decoration: none; line-height: 1.1; }
.brand strong { display: block; font-size: 13px; letter-spacing: -.02em; }.brand small { display: block; margin-top: 5px; color: var(--muted); font: 10px "DM Mono", monospace; text-transform: uppercase; letter-spacing: .08em; }
.brand-mark { width: 32px; height: 32px; display: grid; place-items: center; background: var(--ink); color: var(--paper); border-radius: 9px; font: 700 13px "DM Mono", monospace; }.brand-mark span { color: var(--accent); }
.ui-icon { display: block; width: var(--icon); height: var(--icon); flex: 0 0 auto; }
.icon-button { width: var(--control); height: var(--control); padding: 0; display: inline-grid; place-items: center; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); background: transparent; cursor: pointer; transition: background .2s, border-color .2s, transform .2s; }.icon-button:hover { border-color: color-mix(in srgb, var(--ink) 30%, var(--line)); background: var(--paper-raised); transform: translateY(-1px); }.icon-button[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.sidebar-close, .menu-button { display: none; }
.progress-card { margin: 20px; padding: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper); }
.progress-copy { display: flex; justify-content: space-between; align-items: baseline; font: 11px "DM Mono", monospace; text-transform: uppercase; letter-spacing: .06em; }.progress-copy strong { font-size: 18px; color: var(--ink); }
.progress-track { height: 5px; margin: 12px 0 10px; overflow: hidden; border-radius: 9px; background: var(--line); }.progress-track span { display: block; width: 0; height: 100%; background: var(--accent-deep); transition: width .35s; }
.progress-card p { margin: 0; color: var(--muted); font-size: 11px; }
#curriculum-nav { flex: 1; padding: 0 10px 20px; }
.nav-module > p { margin: 18px 10px 8px; color: var(--muted); font-size: 11px; line-height: 1.35; }.nav-module > p span { display: block; color: var(--ink); font: 500 10px "DM Mono", monospace; text-transform: uppercase; letter-spacing: .08em; }
.nav-module a { display: flex; gap: 11px; align-items: center; min-height: 58px; padding: 9px 10px; border-radius: 10px; text-decoration: none; color: var(--muted); }.nav-module a:hover, .nav-module a.active { background: var(--paper); color: var(--ink); }.nav-module a.active { box-shadow: inset 3px 0 var(--accent-deep); }
.lesson-index { flex: 0 0 28px; width: 28px; height: 28px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; font: 10px "DM Mono", monospace; }.lesson-index .state-icon { width: 14px; height: 14px; }.nav-module a.active .lesson-index { background: var(--accent); color: #17201c; border-color: var(--accent); }
.nav-module a strong, .nav-module a small { display: block; }.nav-module a strong { font-size: 12px; line-height: 1.25; }.nav-module a small { margin-top: 4px; font: 9px "DM Mono", monospace; }
.sidebar-foot { padding: 14px 20px 20px; border-top: 1px solid var(--line); color: var(--muted); font: 9px "DM Mono", monospace; display: flex; justify-content: space-between; align-items: center; }.quiet-button { padding: 0; border: 0; background: none; color: inherit; cursor: pointer; font: inherit; }
.workspace { margin-left: var(--sidebar); min-width: 0; }
.topbar { position: sticky; top: 0; z-index: 10; height: var(--topbar); padding: 0 28px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(14px); }
.topbar-start, .topbar-actions { display: flex; align-items: center; gap: 8px; }.breadcrumb { display: flex; align-items: center; gap: 10px; font-size: 12px; }.breadcrumb span { color: var(--muted); }.breadcrumb span::after { content: "/"; margin-left: 10px; color: var(--line); }
#lesson-content { min-height: calc(100vh - var(--topbar)); }
.lesson { width: min(100% - 48px, 900px); margin: 0 auto; padding: 76px 0 100px; }
.lesson-hero { padding-bottom: 54px; border-bottom: 1px solid var(--line); }.lesson-kicker { display: flex; gap: 14px; color: var(--muted); font: 11px "DM Mono", monospace; text-transform: uppercase; letter-spacing: .1em; }.lesson-kicker span:first-child { color: var(--ink); }.lesson-hero h1 { max-width: 750px; margin: 24px 0 5px; font-size: clamp(44px, 7vw, 76px); line-height: .98; letter-spacing: -.065em; }.lesson-hero > p { margin: 0; color: var(--forest); font-size: 20px; font-weight: 600; }.lesson-summary { max-width: 720px; margin-top: 30px; color: var(--body-text); font-size: 17px; line-height: 1.65; }
.eyebrow { margin: 0 0 14px; color: var(--accent-deep); font: 500 10px "DM Mono", monospace; text-transform: uppercase; letter-spacing: .13em; }
.outcomes { margin: 34px 0 76px; padding: 26px 28px; background: var(--paper-raised); border: 1px solid var(--line); border-radius: var(--radius); }.outcomes ul { display: grid; grid-template-columns: 1fr 1fr; gap: 13px 30px; margin: 0; padding: 0; list-style: none; }.outcomes li { position: relative; padding-left: 23px; font-size: 13px; }.outcomes li::before { content: ""; position: absolute; left: 3px; top: .62em; width: 7px; height: 7px; border-top: 1.5px solid var(--accent-deep); border-right: 1.5px solid var(--accent-deep); transform: rotate(45deg); }
.lesson-roadmap { display: grid; grid-template-columns: 190px 1fr; gap: 28px; margin: -35px 0 80px; padding: 22px 24px; border: 1px solid var(--line); border-radius: var(--radius); background: color-mix(in srgb, var(--accent) 8%, var(--paper-raised)); }.lesson-roadmap > div strong { display: block; font-size: 13px; line-height: 1.35; }.lesson-roadmap ol { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 18px; margin: 0; padding: 0; list-style: none; }.lesson-roadmap button { display: flex; gap: 9px; align-items: baseline; width: 100%; padding: 5px 0; border: 0; background: none; color: var(--muted); text-align: left; font-size: 11px; line-height: 1.35; cursor: pointer; }.lesson-roadmap button:hover { color: var(--ink); }.lesson-roadmap button span { color: var(--accent-deep); font: 9px "DM Mono", monospace; }
.content-section { margin: 0 0 80px; scroll-margin-top: 90px; }.content-section h2, .challenge-section h2, .quiz-section h2, .lab h2, .mastery-panel h2 { max-width: 720px; margin: 0 0 25px; font-size: clamp(28px, 4vw, 40px); line-height: 1.12; letter-spacing: -.045em; }.content-section > p:not(.eyebrow), .content-section > div:not(.signal-grid):not(.principle-list):not(.callout):not(.decision-table) { max-width: 760px; }.content-section p { color: var(--body-text); }.content-section strong { color: var(--ink); }
.teaching-block { max-width: 760px; margin: 28px 0; padding: 24px 26px; border: 1px solid var(--line); border-radius: 13px; background: var(--paper-raised); }.teaching-block h3 { margin: 5px 0 10px; font-size: 17px; line-height: 1.35; }.teaching-block p:last-child { margin-bottom: 0; }.teaching-label { color: var(--accent-deep); font: 600 9px "DM Mono", monospace; text-transform: uppercase; letter-spacing: .1em; }.concept-block { border-left: 4px solid var(--accent-deep); }.worked-example { background: color-mix(in srgb, var(--accent) 9%, var(--paper-raised)); }.example-context { padding-bottom: 15px; border-bottom: 1px solid var(--line); font-size: 13px; }
.concept-comparison { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; max-width: 820px; margin: 30px 0; }.concept-comparison article { min-width: 0; padding: 23px; border: 1px solid var(--line); border-radius: 13px; background: var(--paper-raised); }.concept-comparison article:first-child { border-top: 3px solid var(--muted); }.concept-comparison article:last-child { border-top: 3px solid var(--accent-deep); }.concept-comparison article > span { color: var(--accent-deep); font: 600 9px "DM Mono", monospace; text-transform: uppercase; letter-spacing: .08em; }.concept-comparison h3 { margin: 7px 0 12px; font-size: 16px; }.concept-comparison p, .concept-comparison li { font-size: 13px; line-height: 1.65; }.concept-comparison ul { margin: 10px 0 0; padding-left: 18px; }
.reasoning-steps { max-width: 760px; margin: 30px 0; padding: 25px; border: 1px solid var(--line); border-radius: 13px; }.reasoning-steps h3 { margin: 0 0 18px; font-size: 15px; }.reasoning-steps ol { counter-reset: reasoning; margin: 0; padding: 0; list-style: none; }.reasoning-steps li { counter-increment: reasoning; position: relative; min-height: 34px; padding: 0 0 18px 48px; color: var(--body-text); }.reasoning-steps li:last-child { padding-bottom: 0; }.reasoning-steps li::before { content: counter(reasoning); position: absolute; left: 0; top: -3px; width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%; background: var(--ink); color: var(--paper); font: 10px "DM Mono", monospace; }.reasoning-steps li::after { content: ""; position: absolute; left: 15px; top: 29px; bottom: 0; border-left: 1px solid var(--line); }.reasoning-steps li:last-child::after { display: none; }
.teaching-flow { display: flex; align-items: stretch; gap: 8px; max-width: 840px; margin: 30px 0; }.teaching-flow div { flex: 1; min-width: 0; padding: 17px 14px; border: 1px solid var(--line); border-radius: 11px; background: var(--paper-raised); }.teaching-flow span { display: block; margin-bottom: 6px; color: var(--accent-deep); font: 9px "DM Mono", monospace; }.teaching-flow strong { display: block; font-size: 12px; line-height: 1.4; }.teaching-flow i { align-self: center; color: var(--accent-deep); font-style: normal; }
.understanding-check { max-width: 760px; margin: 28px 0; border: 1px solid var(--line); border-radius: 12px; background: var(--paper-raised); }.understanding-check summary { padding: 18px 21px; cursor: pointer; font-weight: 700; line-height: 1.45; }.understanding-check summary span { display: block; margin-bottom: 5px; color: var(--accent-deep); font: 600 9px "DM Mono", monospace; text-transform: uppercase; letter-spacing: .08em; }.understanding-check > div { padding: 0 21px 20px; border-top: 1px solid var(--line); }.understanding-check > div p:last-child { margin-bottom: 0; }
.teaching-table { max-width: 840px; margin: 30px 0; overflow: hidden; border: 1px solid var(--line); border-radius: 13px; }.teaching-table [role="row"] { display: grid; grid-template-columns: repeat(var(--columns, 3), minmax(0, 1fr)); }.teaching-table [role="row"] > * { padding: 14px 16px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: 12px; line-height: 1.5; }.teaching-table [role="row"] > *:last-child { border-right: 0; }.teaching-table [role="row"]:last-child > * { border-bottom: 0; }.teaching-table [role="row"]:first-child { background: var(--ink); color: var(--paper); }.teaching-table [role="row"]:first-child b { color: inherit; font-size: 10px; text-transform: uppercase; letter-spacing: .04em; }
code, pre { font-family: "DM Mono", monospace; } :not(pre) > code { padding: 2px 5px; border: 1px solid var(--line); border-radius: 5px; background: var(--paper-raised); color: var(--ink); font-size: .9em; }
.code-viewer { margin: 28px 0; overflow: hidden; border: 1px solid #294038; border-radius: var(--radius); background: var(--code); box-shadow: var(--shadow); }
.code-toolbar { height: 46px; padding: 0 12px 0 18px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid rgba(220,233,223,.11); background: color-mix(in srgb, var(--code) 88%, white); color: #aabbb2; }
.code-language, .copy-code { display: inline-flex; align-items: center; gap: 8px; font: 500 10px "DM Mono", monospace; letter-spacing: .08em; text-transform: uppercase; }.code-icon { width: 15px; height: 15px; color: #b8d94c; }
.copy-code { min-height: 30px; padding: 0 9px; border: 1px solid rgba(220,233,223,.14); border-radius: 7px; background: transparent; color: #c6d2cb; cursor: pointer; transition: background .2s, border-color .2s; }.copy-code:hover { border-color: rgba(220,233,223,.3); background: rgba(255,255,255,.06); }.copy-icon { width: 14px; height: 14px; }
pre { margin: 0; padding: 24px 28px 27px; overflow-x: auto; background: transparent; color: var(--code-ink); font-size: 12px; line-height: 1.85; tab-size: 2; }
pre code { display: block; min-width: max-content; }
.token.comment { color: #718a7d; font-style: italic; }.token.string { color: #d7bd73; }.token.annotation, .token.property { color: #8ec8b2; }.token.keyword { color: #d88fc6; }.token.literal, .token.number { color: #e38c72; }.token.type { color: #9bcf68; }.token.function { color: #79b8dd; }.token.parameter { color: #e3aa70; }.token.operator, .token.punctuation { color: #9eada5; }
.signal-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 30px; }.signal-grid article { padding: 20px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper-raised); }.signal-grid span { display: block; color: var(--accent-deep); font: 9px "DM Mono", monospace; text-transform: uppercase; }.signal-grid strong { display: block; margin: 7px 0; }.signal-grid p { margin: 0; font-size: 12px; line-height: 1.5; }
.architecture-flow, .saga-flow, .system-map { display: flex; align-items: stretch; gap: 10px; margin: 30px 0; }.architecture-flow > div, .saga-flow > div, .system-map > div { flex: 1; padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper-raised); }.architecture-flow > div.core { border-color: var(--accent-deep); background: color-mix(in srgb, var(--accent) 18%, var(--paper-raised)); }.architecture-flow > i, .saga-flow > i, .system-map > i { align-self: center; color: var(--accent-deep); font: normal 16px "DM Mono"; }.flow-arrow .ui-icon { width: 16px; height: 16px; }.architecture-flow span, .saga-flow span, .system-map span { display: block; margin-bottom: 5px; color: var(--accent-deep); font: 9px "DM Mono"; text-transform: uppercase; }.architecture-flow b, .saga-flow b, .system-map b { display: block; font-size: 12px; line-height: 1.35; }.saga-flow small, .system-map small { display: block; margin-top: 6px; color: var(--muted); font: 9px "DM Mono"; }
.test-pyramid { display: flex; flex-direction: column; align-items: center; gap: 6px; margin: 30px 0; }.test-pyramid > div { width: var(--w); padding: 11px 16px; display: flex; justify-content: space-between; background: color-mix(in srgb, var(--accent) 32%, var(--paper-raised)); border: 1px solid var(--line); border-radius: 7px; }.test-pyramid span { font-weight: 700; }.test-pyramid b { color: var(--muted); font: 9px "DM Mono"; }
.system-map { gap: 5px; }.system-map > div { padding: 14px; }.system-map > i { font-size: 12px; }
.principle-list { border-top: 1px solid var(--line); }.principle-list article { display: grid; grid-template-columns: 48px 1fr; gap: 20px; padding: 22px 0; border-bottom: 1px solid var(--line); }.principle-list article > b { width: 38px; height: 38px; display: grid; place-items: center; background: var(--accent); color: #17201c; border-radius: 10px; font: 500 17px "DM Mono"; }.principle-list h3 { margin: 0 0 5px; font-size: 16px; }.principle-list p { margin: 0; }
.callout { margin: 24px 0; padding: 22px 24px; border-left: 3px solid var(--accent-deep); background: var(--paper-raised); }.callout p { margin: 6px 0 0; }
.decision-table { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }.decision-table [role="row"] { display: grid; grid-template-columns: 1fr 1.2fr; }.decision-table [role="row"] > * { padding: 15px 18px; border-bottom: 1px solid var(--line); }.decision-table [role="row"]:last-child > * { border-bottom: 0; }.decision-table [role="row"] > *:first-child { border-right: 1px solid var(--line); }.decision-table [role="row"]:first-child { background: var(--ink); color: var(--paper); font-size: 11px; }
.challenge-section, .quiz-section { margin: 100px 0 80px; padding-top: 70px; border-top: 1px solid var(--line); }.section-heading-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; }.section-heading-row h2 { margin-bottom: 0; }.section-counter { flex: 0 0 auto; margin-top: 5px; padding: 7px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); background: var(--paper-raised); font: 9px "DM Mono", monospace; text-transform: uppercase; letter-spacing: .06em; }.section-intro { max-width: 680px; margin: 18px 0 30px; color: var(--body-text); }.challenge-card, .quiz-card { margin: 24px 0; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-raised); }.challenge-card { padding: 28px; }.challenge-card legend, .quiz-card legend { display: flex; gap: 12px; align-items: flex-start; padding: 0 4px; font-weight: 700; line-height: 1.4; }.challenge-card legend { display: block; width: 100%; }.challenge-card legend > span { display: block; margin-bottom: 8px; color: var(--accent-deep); font: 500 10px "DM Mono", monospace; text-transform: uppercase; letter-spacing: .08em; }.quiz-card legend > span { flex: 0 0 26px; height: 26px; display: grid; place-items: center; border-radius: 50%; background: var(--ink); color: var(--paper); font: 10px "DM Mono"; }.challenge-card .code-viewer { margin: 22px 0; box-shadow: none; }.challenge-options, .quiz-options { display: grid; gap: 8px; margin-top: 20px; }.challenge-options button, .quiz-options button { display: flex; gap: 12px; align-items: center; width: 100%; padding: 13px 15px; text-align: left; border: 1px solid var(--line); border-radius: 9px; background: var(--paper); color: var(--ink); cursor: pointer; }.challenge-options button:hover:not(:disabled), .quiz-options button:hover:not(:disabled) { border-color: var(--accent-deep); }.challenge-options button.correct, .quiz-options button.correct { border-color: var(--accent-deep); background: color-mix(in srgb, var(--accent) 22%, var(--paper)); }.challenge-options button.wrong, .quiz-options button.wrong { border-color: var(--danger); }.challenge-feedback, .quiz-feedback { margin-top: 16px; padding: 15px 17px; background: var(--paper); border-radius: 9px; }.challenge-feedback p, .quiz-feedback p { margin: 4px 0 0; color: var(--body-text); font-size: 13px; }
.option-index { min-width: 16px; color: var(--muted); font: 10px "DM Mono", monospace; }
.lab { margin: 90px 0; padding: 38px; background: var(--forest); color: var(--paper); border-radius: 20px; box-shadow: var(--shadow); }.lab .eyebrow { color: var(--accent); }.lab-heading > p:last-child { max-width: 700px; color: color-mix(in srgb, var(--paper) 72%, transparent); }.lab-assets { display: grid; grid-template-columns: 1.2fr 1fr; gap: 9px; margin: 28px 0 14px; padding: 18px; border: 1px solid color-mix(in srgb, var(--paper) 16%, transparent); border-radius: 12px; background: color-mix(in srgb, var(--paper) 6%, transparent); }.lab-assets > div { grid-row: span 3; align-self: center; }.lab-assets > div span, .lab-command span { display: block; color: var(--accent); font: 9px "DM Mono", monospace; text-transform: uppercase; letter-spacing: .08em; }.lab-assets > div strong { display: block; margin-top: 5px; font-size: 13px; }.lab-assets a { display: flex; align-items: center; gap: 8px; min-height: 38px; padding: 0 11px; border: 1px solid color-mix(in srgb, var(--paper) 18%, transparent); border-radius: 8px; color: var(--paper); text-decoration: none; font-size: 11px; }.lab-assets a:hover { border-color: var(--accent); background: color-mix(in srgb, var(--paper) 8%, transparent); }.lab-command { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 14px; padding: 13px 16px; border-radius: 10px; background: color-mix(in srgb, var(--code) 72%, transparent); }.lab-command code { color: var(--code-ink); font-size: 11px; }.lab-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin: 30px 0; padding-top: 26px; border-top: 1px solid color-mix(in srgb, var(--paper) 20%, transparent); }.lab h3 { margin-top: 0; font-size: 13px; }.lab li { margin-bottom: 9px; color: color-mix(in srgb, var(--paper) 82%, transparent); font-size: 13px; }.lab-check-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }.lab-check-heading span { color: var(--accent); font: 10px "DM Mono", monospace; }.lab-checks { display: grid; gap: 9px; }.lab-check { display: grid; grid-template-columns: 18px 1fr; gap: 9px; align-items: start; color: color-mix(in srgb, var(--paper) 82%, transparent); font-size: 12px; line-height: 1.45; cursor: pointer; }.lab-check input { width: 16px; height: 16px; margin: 2px 0 0; accent-color: var(--accent); }.lab details { padding: 15px 18px; background: color-mix(in srgb, var(--paper) 8%, transparent); border-radius: 10px; }.lab details + details { margin-top: 9px; }.lab summary { cursor: pointer; font-weight: 700; }.lab details p { margin-bottom: 0; color: color-mix(in srgb, var(--paper) 75%, transparent); }
.lab-command code { padding: 0; border: 0; background: none; color: var(--code-ink); font-size: 11px; }
.mastery-panel { display: grid; grid-template-columns: 1.25fr 1fr; gap: 36px; align-items: end; margin: 90px 0; padding: 30px; border: 1px solid var(--line); border-radius: 18px; background: color-mix(in srgb, var(--accent) 10%, var(--paper-raised)); }.mastery-panel h2 { margin-bottom: 10px; }.mastery-panel > div:first-child > p:last-child { margin: 0; color: var(--muted); font-size: 12px; }.mastery-metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(88px, 1fr)); gap: 8px; }.mastery-metrics article { min-width: 0; padding: 15px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); text-align: center; }.mastery-metrics span { display: block; color: var(--forest); font: 500 20px "DM Mono", monospace; }.mastery-metrics small { display: block; margin-top: 5px; color: var(--muted); font-size: 9px; line-height: 1.3; }
.takeaways { margin: 80px 0; }.takeaways ol { counter-reset: takeaway; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }.takeaways li { counter-increment: takeaway; display: grid; grid-template-columns: 45px 1fr; padding: 18px 0; border-bottom: 1px solid var(--line); font-weight: 600; }.takeaways li::before { content: "0" counter(takeaway); color: var(--accent-deep); font: 11px "DM Mono"; }
.references { margin: 80px 0; }.references h2 { margin: 0 0 24px; font-size: 26px; letter-spacing: -.035em; }.references > div { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }.references a { min-width: 0; padding: 18px; border: 1px solid var(--line); border-radius: 11px; background: var(--paper-raised); text-decoration: none; }.references a:hover { border-color: var(--accent-deep); }.references span { color: var(--accent-deep); font: 9px "DM Mono", monospace; text-transform: uppercase; }.references strong { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 6px; font-size: 13px; line-height: 1.35; }.references p { margin: 9px 0 0; color: var(--muted); font-size: 11px; line-height: 1.5; }
.notes-block { padding: 25px; border: 1px solid var(--line); border-radius: var(--radius); }.notes-block label { display: block; font-weight: 700; }.notes-block p { margin: 2px 0 14px; color: var(--muted); font-size: 11px; }.notes-block textarea { width: 100%; min-height: 130px; padding: 14px; resize: vertical; border: 1px solid var(--line); border-radius: 9px; background: var(--paper); color: var(--ink); }.notes-block textarea:focus { outline: 2px solid var(--accent-deep); outline-offset: 2px; }
.lesson-footer { display: flex; gap: 24px; align-items: center; justify-content: space-between; margin-top: 30px; }.lesson-footer p { max-width: 350px; color: var(--muted); font-size: 11px; text-align: right; }.complete-button, .primary-button { display: inline-flex; gap: 9px; align-items: center; justify-content: center; min-height: 48px; padding: 0 20px; border: 0; border-radius: 10px; background: var(--ink); color: var(--paper); font-weight: 700; text-decoration: none; cursor: pointer; }.button-icon { width: 17px; height: 17px; }.complete-button.is-complete { background: var(--accent); color: #17201c; }
.lesson-navigation { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 70px; padding-top: 25px; border-top: 1px solid var(--line); }.lesson-navigation a { padding: 17px 18px; border: 1px solid var(--line); border-radius: 11px; text-decoration: none; background: var(--paper-raised); }.lesson-navigation a.next { text-align: right; }.lesson-navigation span { display: flex; gap: 6px; align-items: center; margin-bottom: 4px; color: var(--accent-deep); font: 9px "DM Mono"; text-transform: uppercase; }.lesson-navigation a.next span { justify-content: flex-end; }.lesson-navigation strong { font-size: 12px; }.label-icon, .inline-icon { width: 13px; height: 13px; }.inline-icon { display: inline; vertical-align: -2px; }
.home-hero { min-height: calc(100vh - var(--topbar)); padding: clamp(55px, 7vw, 100px) clamp(30px, 8vw, 110px); display: flex; flex-direction: column; justify-content: center; background: radial-gradient(circle at 85% 18%, color-mix(in srgb, var(--accent) 28%, transparent), transparent 25%); }.home-hero h1 { max-width: 950px; margin: 15px 0 25px; font-size: clamp(55px, 7vw, 96px); line-height: .9; letter-spacing: -.075em; }.home-hero h1 em { color: var(--forest); font-style: normal; }.home-hero .lead { max-width: 700px; color: var(--muted); font-size: 18px; }.hero-actions { display: flex; align-items: center; gap: 20px; margin-top: 28px; }.hero-actions > span { color: var(--muted); font: 10px "DM Mono"; text-transform: uppercase; }
.home-overview { padding: 90px clamp(30px, 8vw, 110px) 120px; border-top: 1px solid var(--line); background: var(--paper-raised); }.overview-intro { max-width: 730px; }.overview-intro h2 { margin: 0 0 20px; font-size: clamp(35px, 5vw, 56px); line-height: 1.02; letter-spacing: -.055em; }.overview-intro > p:last-child { color: var(--muted); }.journey-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 45px; }.journey-grid > article { padding: 28px; border: 1px solid var(--line); border-radius: 16px; background: var(--paper); }.journey-grid > article > span { color: var(--accent-deep); font: 10px "DM Mono"; text-transform: uppercase; }.journey-grid h3 { margin: 6px 0 22px; font-size: 20px; }.journey-grid ol { margin: 0; padding: 0; list-style: none; }.journey-grid li { border-top: 1px solid var(--line); }.journey-grid li a { display: grid; grid-template-columns: 32px 1fr auto; gap: 10px; align-items: center; padding: 12px 0; text-decoration: none; font-size: 12px; }.journey-index { color: var(--accent-deep); font: 9px "DM Mono"; }.journey-grid li small { color: var(--muted); font: 9px "DM Mono"; }.course-method { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 55px; }.course-method article { padding: 25px; border-top: 2px solid var(--ink); }.course-method span { color: var(--accent-deep); font: 28px "DM Mono"; }.course-method h3 { margin: 10px 0 5px; font-size: 14px; }.course-method p { margin: 0; color: var(--muted); font-size: 12px; }
.modal-backdrop { position: fixed; inset: 0; z-index: 50; padding: 10vh 20px; background: rgba(10, 16, 13, .62); backdrop-filter: blur(5px); }.modal-backdrop[hidden], .sidebar-scrim[hidden] { display: none; }.search-dialog { width: min(680px, 100%); max-height: 75vh; margin: auto; overflow: hidden auto; background: var(--paper-raised); border-radius: 16px; box-shadow: var(--shadow); }.search-input-wrap { position: sticky; top: 0; display: flex; align-items: center; gap: 12px; padding: 18px; border-bottom: 1px solid var(--line); background: var(--paper-raised); }.search-leading-icon { color: var(--muted); }.search-input-wrap input { flex: 1; border: 0; outline: 0; background: none; color: var(--ink); font-size: 16px; }.search-input-wrap kbd { min-width: 33px; padding: 3px 7px; border: 1px solid var(--line); border-radius: 5px; color: var(--muted); font: 9px "DM Mono"; text-align: center; }.search-results { padding: 10px; }.search-results > p { padding: 20px; color: var(--muted); text-align: center; }.search-results a { display: block; padding: 15px; border-radius: 10px; text-decoration: none; }.search-results a:hover { background: var(--paper); }.search-results span { color: var(--accent-deep); font: 9px "DM Mono"; text-transform: uppercase; }.search-results strong { display: block; }.search-results p { margin: 5px 0 0; color: var(--muted); font-size: 11px; }
.toast { position: fixed; z-index: 80; right: 22px; bottom: 22px; padding: 12px 16px; transform: translateY(20px); opacity: 0; border-radius: 9px; background: var(--ink); color: var(--paper); transition: .2s; pointer-events: none; }.toast.show { opacity: 1; transform: translateY(0); }
.focus-mode .course-sidebar { transform: translateX(-100%); }.focus-mode .workspace { margin-left: 0; }.focus-mode .menu-button { display: inline-grid; }
@media (max-width: 1024px) {
  .course-sidebar { transform: translateX(-100%); transition: transform .25s; box-shadow: var(--shadow); }.course-sidebar.open { transform: translateX(0); }.workspace { margin-left: 0; }.menu-button, .sidebar-close { display: inline-grid; }.sidebar-close { margin-left: auto; }.sidebar-scrim { position: fixed; inset: 0; z-index: 15; background: rgba(10,16,13,.45); }.lesson { width: min(100% - 56px, 820px); }.topbar { padding: 0 22px; }
}
@media (max-width: 700px) {
  .lesson { width: min(100% - 32px, 820px); padding-top: 45px; }.lesson-hero h1 { font-size: 46px; }.lesson-kicker { flex-wrap: wrap; row-gap: 5px; }.outcomes ul, .signal-grid, .lab-grid, .journey-grid, .course-method, .mastery-panel, .lab-assets, .references > div, .lesson-roadmap, .concept-comparison { grid-template-columns: 1fr; }.lesson-roadmap { gap: 16px; margin-top: -35px; }.lesson-roadmap ol { grid-template-columns: 1fr; }.lab-assets > div { grid-row: auto; margin-bottom: 6px; }.lab-command { align-items: flex-start; flex-direction: column; }.mastery-metrics { grid-template-columns: 1fr 1fr 1fr; }.decision-table [role="row"] { grid-template-columns: 1fr; }.decision-table [role="row"] > *:first-child { border-right: 0; }.decision-table [role="row"] > * { border-right: 0; border-bottom: 1px solid var(--line); }.teaching-table { overflow-x: auto; }.teaching-table [role="row"] { min-width: calc(var(--columns) * 150px); }.architecture-flow, .saga-flow, .system-map, .teaching-flow { flex-direction: column; }.architecture-flow > i, .saga-flow > i, .system-map > i, .teaching-flow > i { transform: rotate(90deg); }.test-pyramid > div { width: 100%; }.lab { padding: 25px; }.lesson-footer, .hero-actions, .section-heading-row { align-items: stretch; flex-direction: column; }.section-counter { align-self: flex-start; margin-top: -12px; }.challenge-card { padding: 20px; }.lesson-footer p { text-align: left; }.lesson-navigation { grid-template-columns: 1fr; }.lesson-navigation a.next { text-align: left; }.lesson-navigation a.next span { justify-content: flex-start; }.code-toolbar { padding-inline: 14px 10px; } pre { padding: 21px 20px 24px; }.breadcrumb strong { max-width: 180px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }.home-hero { padding-inline: 24px; }.home-hero h1 { font-size: 54px; }.home-overview { padding-inline: 24px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; } }