:root {
  color-scheme: dark;
  --bg: #080b12;
  --bg-elevated: #0d111a;
  --surface: #121824;
  --surface-2: #171e2c;
  --border: #283043;
  --border-soft: #1d2636;
  --text: #f1f5fb;
  --muted: #9ca8ba;
  --subtle: #6d788b;
  --purple: #a371f7;
  --purple-bright: #bf8cff;
  --blue: #58a6ff;
  --cyan: #56d4dd;
  --green: #3fb950;
  --yellow: #d29922;
  --code: #d2a8ff;
  --shadow: 0 25px 70px rgba(0, 0, 0, .35);
  --header-height: 68px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f7f8fb;
  --bg-elevated: #fff;
  --surface: #fff;
  --surface-2: #f1f3f8;
  --border: #d5dae5;
  --border-soft: #e7eaf0;
  --text: #161b26;
  --muted: #536071;
  --subtle: #727c8c;
  --purple: #6f42c1;
  --purple-bright: #8250df;
  --blue: #0969da;
  --cyan: #087e8b;
  --green: #1a7f37;
  --yellow: #9a6700;
  --code: #6639ba;
  --shadow: 0 25px 70px rgba(32, 42, 66, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 24px); }
body { margin: 0; background: var(--bg); color: var(--text); font-size: 16px; line-height: 1.65; }
a { color: var(--blue); text-underline-offset: 3px; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; border-radius: 4px; }
.skip-link { position: fixed; top: -100px; left: 16px; z-index: 100; padding: 10px 16px; color: #fff; background: #0969da; font-weight: 700; }
.skip-link:focus { top: 10px; }

.site-header {
  position: sticky; top: 0; z-index: 50; min-height: var(--header-height); display: flex; align-items: center;
  justify-content: space-between; gap: 14px; flex-wrap: wrap; padding: 10px clamp(20px, 4vw, 60px); border-bottom: 1px solid var(--border-soft);
  background: color-mix(in srgb, var(--bg-elevated) 88%, transparent); backdrop-filter: blur(18px);
}
.brand { display: flex; align-items: center; gap: 11px; color: var(--text); font-size: 15px; text-decoration: none; letter-spacing: -.01em; }
.brand strong { color: var(--muted); font-weight: 500; }
.brand-mark { width: 35px; height: 35px; }
.brand-mark .mark-plate { fill: color-mix(in srgb, var(--purple) 16%, transparent); stroke: var(--purple-bright); stroke-width: 1.4; }
.brand-mark .mark-spark { fill: var(--purple-bright); }
.brand-mark .mark-spark-small { fill: var(--cyan); }
.brand-route {
  display: inline-flex; align-items: center; gap: 7px; margin-right: auto; padding: 5px 11px 5px 9px;
  border: 1px solid color-mix(in srgb, var(--purple) 45%, transparent); border-radius: 999px;
  background: color-mix(in srgb, var(--purple) 14%, transparent); color: var(--text);
  font-size: 12.5px; font-weight: 600; letter-spacing: -.01em; white-space: nowrap;
}
.brand-route svg { width: 15px; height: 15px; fill: none; stroke: var(--purple-bright); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.brand-route[hidden] { display: none; }
.header-actions { display: flex; align-items: center; gap: 18px; }
.icon-button { width: 38px; height: 38px; display: grid; place-items: center; background: var(--surface); border: 1px solid var(--border); color: var(--text); border-radius: 8px; cursor: pointer; }
.icon-button:hover { background: var(--surface-2); }
.icon-button svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.sun-icon { display: none; }
[data-theme="light"] .sun-icon { display: block; }
[data-theme="light"] .moon-icon { display: none; }
.progress-pill { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 12px; font-weight: 600; }
.progress-track { width: 76px; height: 5px; border-radius: 4px; background: var(--border); overflow: hidden; }
.progress-track span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--purple), var(--cyan)); transition: width .35s ease; }

.hero {
  position: relative; min-height: 665px; overflow: hidden; display: grid; grid-template-columns: minmax(340px, 530px) minmax(480px, 680px);
  align-items: center; gap: clamp(40px, 6vw, 100px); padding: 80px max(5vw, calc((100vw - 1280px)/2)); border-bottom: 1px solid var(--border-soft);
  background-image: linear-gradient(rgba(255,255,255,.022) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.022) 1px, transparent 1px);
  background-size: 48px 48px;
}
[data-theme="light"] .hero { background-image: linear-gradient(rgba(20,30,50,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(20,30,50,.035) 1px, transparent 1px); }
.hero-glow { position: absolute; width: 500px; height: 500px; filter: blur(100px); opacity: .18; border-radius: 50%; pointer-events: none; }
.hero-glow-one { background: var(--purple); right: 10%; top: -260px; }
.hero-glow-two { background: var(--blue); left: -300px; bottom: -300px; }
.hero-content { position: relative; z-index: 2; }
.eyebrow, .section-kicker, .tour-label, .mini-kicker { color: var(--purple-bright); text-transform: uppercase; letter-spacing: .15em; font-size: 11px; font-weight: 800; }
.eyebrow { display: flex; align-items: center; gap: 8px; margin-bottom: 24px; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 5px color-mix(in srgb, var(--green) 15%, transparent); }
h1 { margin: 0; font-size: clamp(50px, 5vw, 76px); line-height: 1.04; letter-spacing: -.055em; }
h1 span { color: transparent; background: linear-gradient(100deg, var(--purple-bright), var(--blue), var(--cyan)); background-clip: text; -webkit-background-clip: text; }
.hero-lede { max-width: 520px; margin: 26px 0 30px; color: var(--muted); font-size: 19px; line-height: 1.6; }
.hero-actions { display: flex; align-items: center; gap: 24px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; padding: 11px 18px; border: 0; border-radius: 8px; font-size: 14px; font-weight: 700; text-decoration: none; }
.button-primary { color: #fff; background: linear-gradient(135deg, #8250df, #6639ba); box-shadow: 0 8px 26px rgba(111, 66, 193, .28); }
.button-primary:hover { filter: brightness(1.12); transform: translateY(-1px); }
.button svg { width: 16px; fill: none; stroke: currentColor; stroke-width: 2; }
.duration { display: flex; align-items: center; gap: 7px; color: var(--subtle); font-size: 13px; }
.duration svg { width: 17px; fill: none; stroke: currentColor; stroke-width: 1.5; }

.app-window { position: relative; z-index: 1; border: 1px solid #333d50; border-radius: 13px; background: #0d1117; box-shadow: 0 35px 100px #0009, 0 0 0 1px #ffffff0c inset; transform: perspective(1400px) rotateY(-3deg) rotateX(1deg); overflow: hidden; }
.window-bar { height: 39px; display: flex; align-items: center; gap: 6px; padding: 0 12px; color: #7d8590; background: #161b22; border-bottom: 1px solid #30363d; font-size: 10px; }
.window-bar span { width: 8px; height: 8px; border-radius: 50%; background: #30363d; }
.window-bar strong { margin: auto; transform: translateX(-20px); font-weight: 500; }
.window-body { height: 370px; display: grid; grid-template-columns: 43px 1fr 42%; }
.mini-sidebar { padding: 15px 0; display: flex; flex-direction: column; align-items: center; gap: 19px; background: #010409; border-right: 1px solid #21262d; }
.mini-logo { color: #a371f7; font-size: 17px; margin-bottom: 7px; }
.mini-sidebar span { width: 14px; height: 14px; border: 1px solid #484f58; border-radius: 4px; }
.mini-sidebar span.active { border-color: #a371f7; background: #a371f733; }
.session-preview { padding: 26px 21px; min-width: 0; }
.session-label { color: #7d8590; font: 600 8px ui-monospace, monospace; letter-spacing: .13em; }
.chat-bubble { margin: 18px 0 23px 28px; padding: 11px 13px; color: #c9d1d9; background: #1c2128; border: 1px solid #30363d; border-radius: 9px; font-size: 9px; line-height: 1.5; }
.agent-row { display: flex; align-items: flex-start; gap: 10px; color: #e6edf3; font-size: 9px; }
.agent-row p { color: #8b949e; line-height: 1.5; }
.agent-spark { color: #a371f7; font-size: 15px; }
.file-change { margin: 16px 0 17px 26px; padding: 9px; border: 1px solid #23863655; border-radius: 6px; color: #8b949e; font: 8px ui-monospace, monospace; }
.file-change span { color: #3fb950; margin-right: 6px; }.file-change em { float: right; color: #3fb950; font-style: normal; }
.typing { display: flex; gap: 4px; margin-left: 27px; }
.typing i { width: 4px; height: 4px; border-radius: 50%; background: #8b949e; animation: pulse 1.3s infinite; }.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}
.browser-preview { margin: 9px 9px 9px 0; padding: 0 24px; text-align: center; color: #e6edf3; background: radial-gradient(circle at 50% 20%, #25205e, #0a0c1a 62%); border: 1px solid #30363d; border-radius: 8px; }
.browser-bar { height: 30px; display: flex; align-items: center; gap: 8px; margin: 0 -24px 31px; padding: 0 10px; color: #7d8590; background: #161b22; border-bottom: 1px solid #30363d; font-size: 7px; }
.browser-bar span:first-child { width: 6px; height: 6px; border-radius: 50%; background: #3fb950; }
.planet { font-size: 35px; margin-bottom: 11px; }.browser-preview strong { display: block; color: #d2a8ff; font-size: 14px; letter-spacing: .15em; }.browser-preview small { color: #8b949e; font-size: 7px; }
.quiz-progress { height: 4px; margin: 14px 0 20px; background: #30363d; border-radius: 3px; }.quiz-progress span { display: block; width: 30%; height: 100%; background: #a371f7; border-radius: 3px; }
.answer { height: 25px; margin: 7px 0; border: 1px solid #444c56; background: #161b22aa; border-radius: 5px; }.answer.short { width: 75%; }

.lab-layout { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: 215px minmax(0, 820px); gap: 75px; padding: 0 24px; }
.lab-nav { position: sticky; top: calc(var(--header-height) + 36px); align-self: start; display: flex; flex-direction: column; padding-top: 70px; max-height: calc(100vh - var(--header-height) - 36px); }
.nav-heading { flex: none; margin-bottom: 14px; color: var(--subtle); font-size: 10px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.lab-nav nav { display: flex; flex-direction: column; min-height: 0; overflow-y: auto; overscroll-behavior: contain; scrollbar-width: thin; border-left: 1px solid var(--border); }
.lab-nav a { color: var(--muted); text-decoration: none; }
.nav-link { display: flex; align-items: center; gap: 11px; margin-left: -1px; padding: 8px 0 8px 16px; border-left: 2px solid transparent; font-size: 12.5px; font-weight: 600; }
.nav-link span { color: var(--subtle); font: 10px ui-monospace, monospace; }
.nav-link:hover, .nav-link.active { color: var(--text); border-color: var(--purple); }
.nav-link.active span { color: var(--purple-bright); }
.nav-sub { display: flex; flex-direction: column; gap: 3px; padding: 4px 0 8px 48px; font-size: 11px; }
.nav-sub a:hover { color: var(--text); }
.reset-button { margin: 24px 0 0 16px; padding: 0; color: var(--subtle); background: none; border: none; font-size: 11px; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.reset-button:hover { color: var(--text); }
/* Route picker · lives inside the overview, where the lab actually starts */
.route-picker { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 4px 0 30px; padding: 0; }
.route-card { position: relative; display: flex; flex-direction: column; gap: 9px; align-items: flex-start; min-height: 116px; padding: 17px 18px; text-align: left; color: var(--muted); background: var(--surface); border: 1px solid var(--border); border-radius: 12px; cursor: pointer; transition: border-color .16s ease, transform .16s ease, background .16s ease; }
.route-card:hover { color: var(--text); border-color: var(--purple); transform: translateY(-2px); }
.route-card:focus-visible { outline: 2px solid var(--purple-bright); outline-offset: 3px; }
.route-card .route-icon { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 9px; background: var(--surface-2); color: var(--purple-bright); }
.route-card .route-icon svg { width: 17px; height: 17px; }
.route-card b { color: var(--text); font-size: 14px; font-weight: 700; letter-spacing: -.01em; }
.route-card span { font-size: 11.5px; line-height: 1.55; }
.route-card[aria-pressed="true"] { color: var(--text); background: linear-gradient(150deg, color-mix(in srgb, var(--purple) 18%, var(--surface)), var(--surface)); border-color: var(--purple-bright); box-shadow: 0 0 0 1px color-mix(in srgb, var(--purple) 40%, transparent), 0 14px 34px -22px var(--purple); }
.route-card[aria-pressed="true"] .route-icon { background: linear-gradient(135deg, var(--purple), var(--blue)); color: #fff; }
.route-card[aria-pressed="true"]::after { content: "Your route"; position: absolute; top: 13px; right: 14px; color: var(--purple-bright); font-size: 9px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.route-note { margin: -20px 0 30px; color: var(--subtle); font-size: 11.5px; }
.route-badge { display: none; align-items: center; gap: 4px; color: var(--green); font-size: 9.5px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.route-badge svg.i { width: 11px; height: 11px; stroke-width: 2.6; }
.route-card.is-done .route-badge { position: absolute; right: 14px; bottom: 14px; display: inline-flex; }
.route-card.is-done[aria-pressed="false"] { border-color: color-mix(in srgb, var(--green) 45%, var(--border)); }
.route-card.is-done .route-icon { color: var(--green); }
.route-card.is-done[aria-pressed="true"] .route-icon { color: #fff; }

/* Cross-route tracker on the finish screen */
.route-tracker { margin-top: 34px; text-align: left; }
.route-tracker h3 { margin: 0 0 6px; font-size: 13px; letter-spacing: -.01em; }
.route-tracker-intro { margin: 0 0 14px; color: var(--muted); font-size: 12px; line-height: 1.6; }
.route-tracker-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.route-status { position: relative; display: flex; flex-direction: column; gap: 8px; align-items: flex-start; padding: 15px 16px; text-align: left; background: var(--surface); border: 1px solid var(--border); border-radius: 9px; cursor: pointer; transition: border-color .15s ease, transform .15s ease; }
.route-status:hover { border-color: var(--purple); transform: translateY(-2px); }
.route-status:focus-visible { outline: 2px solid var(--purple-bright); outline-offset: 3px; }
.route-status .route-icon { display: grid; place-items: center; width: 28px; height: 28px; color: var(--purple-bright); background: var(--surface-2); border-radius: 8px; }
.route-status .route-icon svg.i { width: 15px; height: 15px; }
.route-status b { color: var(--text); font-size: 12.5px; }
.route-status small { color: var(--subtle); font-size: 10.5px; }
.route-status.is-current { cursor: default; border-color: var(--purple); }
.route-status.is-current:hover { transform: none; }
.route-status.is-done { border-color: color-mix(in srgb, var(--green) 45%, var(--border)); }
.route-status.is-done .route-icon { color: var(--green); background: color-mix(in srgb, var(--green) 14%, transparent); }
.route-status.is-done .route-badge { position: absolute; top: 15px; right: 14px; display: inline-flex; }

.model-panel { margin: 20px 0 30px; padding: 17px 20px; background: var(--surface); border: 1px solid var(--border); border-radius: 9px; }
.model-panel strong { font-size: 12px; }
.model-panel ol { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 13px 0 0; padding: 0; list-style: none; counter-reset: model; }
.model-panel li { counter-increment: model; padding: 12px; background: var(--surface-2); border-radius: 6px; }
.model-panel li::before { content: counter(model, decimal-leading-zero); display: block; margin-bottom: 8px; color: var(--purple-bright); font: 700 10px ui-monospace, monospace; }
.model-panel li span, .model-panel li small { display: block; }
.model-panel li span { font-size: 12px; font-weight: 700; }
.model-panel li small { margin-top: 3px; color: var(--subtle); font-size: 10px; }
main { min-width: 0; }
.lab-section { padding: 90px 0; border-bottom: 1px solid var(--border-soft); }
.section-kicker { margin-bottom: 14px; }
h2 { margin: 0; font-size: clamp(36px, 5vw, 50px); line-height: 1.12; letter-spacing: -.045em; }
.section-intro { max-width: 710px; margin: 20px 0 38px; color: var(--muted); font-size: 18px; line-height: 1.7; }
.outcome-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 13px; margin: 38px 0; }
.outcome-grid article { padding: 22px 20px; background: var(--surface); border: 1px solid var(--border-soft); border-radius: 10px; }
.feature-icon { width: 32px; height: 32px; display: grid; place-items: center; margin-bottom: 20px; color: var(--purple-bright); background: color-mix(in srgb, var(--purple) 13%, transparent); border-radius: 7px; }
.outcome-grid h3 { margin: 0 0 7px; font-size: 15px; }.outcome-grid p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.6; }
.callout { display: flex; gap: 17px; padding: 22px; margin: 30px 0 45px; background: linear-gradient(110deg, color-mix(in srgb, var(--purple) 12%, var(--surface)), var(--surface)); border: 1px solid color-mix(in srgb, var(--purple) 35%, var(--border)); border-radius: 10px; }
.callout-icon { flex: 0 0 34px; width: 34px; height: 34px; display: grid; place-items: center; color: var(--purple-bright); border: 1px solid var(--purple); border-radius: 50%; }
.callout strong { display: block; margin-bottom: 5px; }.callout p { margin: 0; color: var(--muted); font-size: 13px; }
.split-heading { display: flex; justify-content: space-between; align-items: end; margin-bottom: 18px; }.split-heading h3 { margin: 3px 0 0; font-size: 25px; }.split-heading > span { color: var(--subtle); font-size: 11px; }
.check-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.check-card { display: flex; gap: 12px; align-items: flex-start; padding: 16px; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; cursor: pointer; }
.check-card:hover { border-color: var(--purple); }.check-card strong, .completion-row strong { display: block; font-size: 13px; }.check-card small, .completion-row small { display: block; margin-top: 2px; color: var(--subtle); font-size: 10px; line-height: 1.5; }
.progress-check { position: absolute; opacity: 0; pointer-events: none; }
.custom-check { flex: 0 0 18px; width: 18px; height: 18px; margin-top: 2px; border: 1px solid var(--subtle); border-radius: 5px; }
.progress-check:focus-visible + .custom-check { outline: 3px solid var(--blue); outline-offset: 3px; }
.progress-check:checked + .custom-check { position: relative; background: var(--purple); border-color: var(--purple); }
.progress-check:checked + .custom-check::after { content: ""; position: absolute; left: 5px; top: 2px; width: 5px; height: 9px; border: solid #fff; border-width: 0 2px 2px 0; transform: rotate(45deg); }
.note { padding: 13px 16px; color: var(--muted); background: var(--surface); border-left: 3px solid var(--blue); font-size: 12px; }

.install-banner { display: flex; align-items: center; gap: 15px; padding: 22px; margin: 38px 0 42px; background: var(--surface); border: 1px solid var(--border); border-radius: 11px; }
.install-logo { width: 46px; height: 46px; display: grid; place-items: center; color: #fff; background: linear-gradient(145deg, #a371f7, #388bfd); border-radius: 12px; font-size: 22px; }
.install-banner div:nth-child(2) { display: flex; flex: 1; flex-direction: column; }.install-banner strong { font-size: 16px; }.install-banner span { color: var(--muted); font-size: 11px; }
.task-heading { margin: 42px 0 20px; font-size: 24px; }
.step-list { list-style: none; margin: 0; padding: 0; border: 1px solid var(--border-soft); border-radius: 10px; overflow: hidden; }
.step-list li { display: flex; align-items: flex-start; gap: 16px; padding: 17px 20px; border-bottom: 1px solid var(--border-soft); color: var(--muted); font-size: 13px; }.step-list li:last-child { border: 0; }
.step-number { flex: 0 0 25px; height: 25px; display: grid; place-items: center; color: var(--purple-bright); background: color-mix(in srgb, var(--purple) 12%, transparent); border-radius: 50%; font: 600 10px ui-monospace, monospace; }
.completion-row { display: flex; gap: 13px; align-items: flex-start; padding: 16px 18px; margin-top: 12px; color: var(--text); background: color-mix(in srgb, var(--green) 6%, var(--surface)); border: 1px solid color-mix(in srgb, var(--green) 30%, var(--border)); border-radius: 8px; cursor: pointer; }
.workspace-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 9px; }
.workspace-list > div { display: flex; align-items: flex-start; gap: 13px; padding: 16px; background: var(--surface); border: 1px solid var(--border-soft); border-radius: 8px; }
.workspace-list > div > span { width: 26px; height: 26px; display: grid; place-items: center; color: var(--purple-bright); background: color-mix(in srgb, var(--purple) 12%, transparent); border-radius: 6px; }
.workspace-list p { margin: 0; color: var(--muted); font-size: 11px; }.workspace-list strong { display: block; color: var(--text); font-size: 13px; }
svg.i { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
svg.spark { width: 1em; height: 1em; fill: currentColor; display: block; }
.feature-icon svg.i { width: 17px; height: 17px; }
.workspace-list > div > span svg.i { width: 15px; height: 15px; }
.install-logo svg.i, .finish-badge svg.i { width: 24px; height: 24px; stroke-width: 1.6; }
.prompt-label svg.i { width: 13px; height: 13px; vertical-align: -2px; }
/* Resource links */
.resource-block { margin-top: 34px; text-align: left; }
.resource-block h3 { margin: 0 0 14px; font-size: 13px; letter-spacing: -.01em; }
.resource-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.resource-card { display: block; padding: 14px 16px; background: var(--surface); border: 1px solid var(--border); border-radius: 9px; text-decoration: none; transition: border-color .15s ease, transform .15s ease; }
.resource-card:hover { border-color: var(--purple); transform: translateY(-2px); }
.resource-card strong { display: block; color: var(--text); font-size: 12.5px; }
.resource-card small { display: block; margin-top: 4px; color: var(--subtle); font-size: 10.5px; line-height: 1.5; }

/* Drawn interface scenes */
.art-figure { margin: 22px 0; padding: 0; }
.art { display: block; width: 100%; height: auto; }
.art-figure figcaption { margin-top: 9px; color: var(--subtle); font-size: 11.5px; line-height: 1.55; }
.art .plate { fill: var(--bg-elevated); stroke: var(--border); }
.art .panel { fill: var(--surface); }
.art .rail, .art .head { fill: var(--surface-2); }
.art .win { fill: var(--surface-2); }
.art .card { fill: var(--bg-elevated); stroke: var(--border-soft); stroke-width: 1; }
.art .card.sel { fill: color-mix(in srgb, var(--purple) 16%, var(--bg-elevated)); stroke: var(--purple); }
.art .chip { fill: var(--bg-elevated); stroke: var(--border); }
.art .bubble { fill: color-mix(in srgb, var(--blue) 15%, var(--surface)); stroke: color-mix(in srgb, var(--blue) 40%, transparent); }
.art .menu { fill: var(--bg-elevated); stroke: var(--purple); filter: drop-shadow(0 12px 24px rgba(0,0,0,.28)); }
.art .input { fill: var(--surface-2); stroke: var(--border); }
.art .tab { fill: transparent; stroke: var(--border-soft); }
.art .tab.sel { fill: var(--bg-elevated); stroke: var(--purple); }
.art .cta { fill: var(--purple); stroke: none; }
.art .cta.ghost { fill: transparent; stroke: var(--purple); stroke-dasharray: 4 3; }
.art .track { fill: var(--surface-2); }
.art .fill { fill: var(--purple); }
.art .fill.alt { fill: var(--blue); }
.art .fill.warn { fill: var(--yellow); }
.art .sw { fill: var(--purple); }
.art .sw.alt { fill: var(--blue); }
.art .sw.warn { fill: var(--yellow); }
.art .diff.add { fill: color-mix(in srgb, var(--green) 16%, transparent); }
.art .diff.del { fill: color-mix(in srgb, #f85149 16%, transparent); }
.art .dot { fill: var(--border); }
.art .dot.red { fill: #f85149; }
.art .dot.amber { fill: var(--yellow); }
.art .dot.green { fill: var(--green); }
.art .caret { fill: var(--purple-bright); }
.art .mark { fill: var(--surface-2); stroke: var(--border); }
.art .markGlyph { fill: var(--text); }
.art .send { fill: var(--purple); }
.art .sendGlyph { stroke: #fff; stroke-width: 1.6; fill: none; stroke-linecap: round; }
.art .stroke { fill: none; stroke: var(--muted); stroke-width: 1.2; }
.art .col { fill: var(--surface-2); stroke: var(--border-soft); }
.art .col.drop { fill: color-mix(in srgb, var(--purple) 10%, var(--surface-2)); stroke: var(--purple); stroke-dasharray: 5 4; }
.art .card.ghost { fill: transparent; stroke-dasharray: 4 3; }
.art .card.lift { filter: drop-shadow(0 10px 18px rgba(0,0,0,.3)); }
.art .drag { fill: none; stroke: var(--purple-bright); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.art .rule { stroke: var(--border); stroke-width: 1; }
.art .ok-stroke { fill: none; stroke: var(--green); stroke-width: 1.4; }
.art .alt-stroke { fill: none; stroke: var(--purple-bright); stroke-width: 1.4; }
.art .ok-fill { fill: var(--green); }
.art .tick { fill: none; stroke: var(--bg-elevated); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.art .play { fill: none; stroke: var(--muted); stroke-width: 1.3; stroke-linejoin: round; }
.art .chip.alt { fill: color-mix(in srgb, var(--blue) 16%, var(--bg-elevated)); stroke: color-mix(in srgb, var(--blue) 40%, transparent); }
.art .blue { fill: var(--blue); }
.art .lead { stroke: var(--purple); stroke-width: 1; stroke-dasharray: 3 3; }
.art .link { fill: var(--blue); }
.art .fill.ok { fill: var(--green); }
.art .chip.sel { fill: color-mix(in srgb, var(--purple) 16%, var(--bg-elevated)); stroke: var(--purple); }
.art .sparkle { fill: var(--purple-bright); }
.art text { font-family: Inter, ui-sans-serif, system-ui, sans-serif; }
.art .mono text, .art text.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.art .t-xs { font-size: 10px; }
.art .t-sm { font-size: 12px; }
.art .txt { fill: var(--text); }
.art .mut { fill: var(--muted); }
.art .accent { fill: var(--purple-bright); }
.art .ok { fill: var(--green); }
.art .bad { fill: #f85149; }
.art .inv { fill: #fff; }


.command-block { margin: 14px 0; padding: 14px 16px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); overflow-x: auto; }
.command-block code { display: block; padding: 0; border: 0; background: none; white-space: pre; font-size: 12.5px; line-height: 1.85; color: var(--text); }

.prompt-card { position: relative; margin: 24px 0; padding: 43px 100px 17px 18px; background: #0d1117; border: 1px solid #30363d; border-radius: 8px; color: #e6edf3; }
.prompt-card.large { padding-right: 120px; }
.prompt-label { position: absolute; left: 18px; top: 12px; color: #8b949e; font: 600 9px ui-monospace, monospace; text-transform: uppercase; letter-spacing: .1em; }
.prompt-label span { color: #a371f7; }.prompt-card code { color: #d9e1eb; font: 11px/1.6 ui-monospace, SFMono-Regular, Consolas, monospace; white-space: normal; }
.copy-button { position: absolute; right: 12px; top: 12px; padding: 5px 8px; color: #8b949e; background: #21262d; border: 1px solid #30363d; border-radius: 5px; font-size: 9px; cursor: pointer; }
.copy-button:hover { color: #fff; border-color: #8b949e; }

.tour-start { padding-bottom: 58px; }
.route { display: flex; align-items: center; margin-top: 38px; color: var(--subtle); font: 600 9px ui-monospace, monospace; text-transform: uppercase; letter-spacing: .09em; }
.route span { padding: 6px 9px; background: var(--surface); border: 1px solid var(--border); border-radius: 5px; }.route span.done { color: var(--purple-bright); border-color: var(--purple); }
.route i { flex: 1; height: 1px; background: var(--border); }
.tour-section { position: relative; display: grid; grid-template-columns: 48px 1fr; gap: 22px; padding: 0 0 75px; }
.tour-section::before { content: ""; position: absolute; top: 34px; bottom: 0; left: 18px; width: 1px; background: linear-gradient(var(--purple), var(--border)); }
.tour-section.last::before { display: none; }
.tour-marker { position: relative; z-index: 1; padding-top: 2px; }.tour-marker span { width: 37px; height: 37px; display: grid; place-items: center; color: var(--purple-bright); background: var(--bg); border: 1px solid var(--purple); border-radius: 50%; font: 700 9px ui-monospace, monospace; }
.tour-content { min-width: 0; padding-bottom: 15px; }.tour-label { margin-bottom: 5px; }.tour-content h3 { margin: 0 0 12px; font-size: 27px; letter-spacing: -.02em; }.tour-content h4 { margin: 34px 0 8px; font-size: 18px; }
.tour-content > p { color: var(--muted); font-size: 13px; }.compact-steps { margin: 20px 0; padding-left: 22px; color: var(--muted); font-size: 13px; }.compact-steps li { padding: 3px 0 3px 5px; }.compact-steps li::marker { color: var(--purple-bright); font: 600 10px ui-monospace, monospace; }
code { padding: 2px 5px; color: var(--code); background: color-mix(in srgb, var(--purple) 10%, var(--surface)); border-radius: 4px; font: .88em ui-monospace, SFMono-Regular, Consolas, monospace; }
.prompt-card code { padding: 0; background: none; }
.section-complete { display: inline-flex; align-items: center; gap: 9px; padding: 8px 12px; margin-top: 12px; color: var(--muted); background: var(--surface); border: 1px solid var(--border); border-radius: 7px; font-size: 11px; cursor: pointer; }
.section-complete:has(input:checked) { color: var(--green); border-color: color-mix(in srgb, var(--green) 50%, var(--border)); }
details { margin: 22px 0; padding: 0 15px; background: var(--surface); border: 1px solid var(--border-soft); border-radius: 7px; color: var(--muted); font-size: 12px; }
summary { display: flex; justify-content: space-between; padding: 12px 0; color: var(--text); cursor: pointer; font-weight: 600; }summary span { color: var(--purple-bright); font-size: 16px; }details[open] summary span { transform: rotate(45deg); }
.warning { display: flex; gap: 15px; padding: 15px; margin: 20px 0; background: color-mix(in srgb, var(--yellow) 8%, var(--surface)); border: 1px solid color-mix(in srgb, var(--yellow) 30%, var(--border)); border-radius: 8px; font-size: 11px; }.warning strong { flex: 0 0 125px; color: color-mix(in srgb, var(--yellow) 85%, var(--text)); }.warning span { color: var(--muted); }

.finish-section { text-align: center; border: 0; }
.finish-badge { width: 54px; height: 54px; display: grid; place-items: center; margin: 20px auto 24px; color: #fff; background: linear-gradient(145deg, var(--purple), var(--blue)); border-radius: 16px; box-shadow: 0 0 50px color-mix(in srgb, var(--purple) 32%, transparent); font-size: 25px; }
.finish-section .section-intro { margin-left: auto; margin-right: auto; }.recap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 40px 0 55px; text-align: left; }
.recap-grid > div { position: relative; padding: 20px; background: var(--surface); border: 1px solid var(--border-soft); border-radius: 8px; }.recap-grid span { position: absolute; right: 13px; top: 12px; color: var(--border); font: 700 20px ui-monospace, monospace; }.recap-grid strong, .recap-grid small { display: block; }.recap-grid strong { font-size: 13px; }.recap-grid small { color: var(--subtle); font-size: 10px; }
.final-check { max-width: 430px; margin: 32px auto 0; text-align: left; }

footer { display: flex; align-items: center; justify-content: space-between; gap: 30px; max-width: 1180px; margin: 0 auto; padding: 35px 24px; border-top: 1px solid var(--border-soft); color: var(--subtle); font-size: 10px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: var(--text); }.footer-brand > span { color: var(--purple-bright); font-size: 20px; }.footer-brand strong, .footer-brand small { display: block; }.footer-brand small { color: var(--subtle); }
footer a { color: var(--muted); }
footer > p { margin: 0; }
.footer-links { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); flex: 1 1 390px; gap: 8px; max-width: 440px; min-width: 0; }
.footer-links a { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 1px 8px; padding: 8px 10px; border: 1px solid var(--border-soft); border-radius: 8px; background: var(--surface); color: var(--text); text-decoration: none; transition: border-color .15s ease, background .15s ease, transform .15s ease; }
.footer-links a:hover { transform: translateY(-1px); border-color: var(--purple-bright); background: var(--surface-2); }
.footer-links strong { font-size: 10px; line-height: 1.3; }
.footer-links small { color: var(--subtle); font-size: 9px; line-height: 1.3; }
.footer-links a > span { grid-column: 2; grid-row: 1 / span 2; color: var(--subtle); font-size: 11px; }

@keyframes pulse { 0%, 60%, 100% { opacity: .3; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-2px); } }
@media (max-width: 1000px) {
  .hero { grid-template-columns: 1fr; padding-top: 70px; }.hero-content { max-width: 650px; }.app-window { width: min(680px, 100%); transform: none; }
  .lab-layout { grid-template-columns: 180px minmax(0, 1fr); gap: 40px; }
}
@media (max-width: 760px) {
  .site-header { justify-content: space-between; padding: 10px 20px 12px; }
  .product-switcher { order: 3; width: 100%; }
  .product-switcher button { flex: 1; min-height: 40px; padding: 8px 6px; font-size: 11.5px; }
  .progress-pill { display: none; }
  .hero { min-height: auto; padding: 65px 20px; }.app-window { display: none; }
  .lab-layout { display: block; padding: 0 20px; }.lab-nav { display: none; }
  .lab-section { padding: 70px 0; }.outcome-grid, .check-grid, .recap-grid { grid-template-columns: 1fr; }
  .resource-grid, .route-picker, .route-tracker-grid { grid-template-columns: 1fr; }
  .route-card { min-height: 0; }
  .split-heading { align-items: flex-start; flex-direction: column; gap: 8px; }
  .model-panel ol { grid-template-columns: 1fr; }
  .route { overflow-x: auto; }.route i { min-width: 16px; }
  .tour-section { grid-template-columns: 38px 1fr; gap: 12px; }.tour-section::before { left: 15px; }.tour-marker span { width: 31px; height: 31px; }
  .install-banner { align-items: flex-start; flex-wrap: wrap; }.install-banner .button { width: 100%; }
  footer { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 460px) {
  h1 { font-size: 43px; }.hero-lede { font-size: 17px; }.hero-actions { align-items: flex-start; flex-direction: column; gap: 15px; }
  .site-header { padding: 10px 15px 12px; }.brand strong { display: none; }.brand-mark { width: 30px; height: 30px; }
  .product-switcher button { padding: 8px 4px; font-size: 11px; }
  .prompt-card, .prompt-card.large { padding: 48px 14px 16px; }.prompt-card code { display: block; padding-top: 8px; }
  .warning { flex-direction: column; gap: 5px; }.warning strong { flex-basis: auto; }
  .footer-links { width: 100%; grid-template-columns: 1fr; max-width: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}