:root {
  color-scheme: light;
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-soft: #f8f9fb;
  --ink: #18202b;
  --muted: #647083;
  --line: #778496;
  --accent: #3167d8;
  --focus: #1c4ba4;
  --accent-soft: #eaf0ff;
  --success: #147a50;
  --warning: #9a5b00;
  --danger: #a43131;
  --shadow: 0 18px 45px rgba(31, 42, 61, 0.08), 0 3px 10px rgba(31, 42, 61, 0.06);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); min-height: 100vh; }
button, input, textarea, select { font: inherit; }
a { color: var(--accent); }
.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; }
[hidden] { display: none !important; }

.topbar {
  min-height: 68px; padding: 12px 22px; display: flex; align-items: center; justify-content: space-between;
  gap: 18px; background: rgba(255,255,255,.94); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(12px);
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 12px; background: var(--ink); color: white; font-weight: 800; }
.brand span:last-child { display: grid; }
.brand small { color: var(--muted); }
.topbar-actions { display: flex; align-items: center; justify-content: flex-end; gap: 8px; flex-wrap: wrap; }
button { min-height: 44px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 10px; padding: 8px 12px; cursor: pointer; }
button:hover { border-color: #aeb9c7; }
button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible, a:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
button:disabled { opacity: .45; cursor: not-allowed; }
.primary-action { background: var(--accent); color: white; border-color: var(--accent); }
.danger-action { color: var(--danger); }
.text-action { background: transparent; }

.status-pill { display: inline-flex; padding: 5px 9px; border-radius: 999px; font-size: 12px; font-weight: 750; letter-spacing: .02em; }
.status-current { background: #e5f5ee; color: var(--success); }
.status-demo { background: #fff0d8; color: var(--warning); }
.workspace-summary { color: var(--muted); font-size: 13px; }

.workspace { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(340px, .85fr); gap: 18px; padding: 18px; max-width: 1600px; margin: 0 auto; }
.explanation-panel, .conversation-panel { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); min-height: calc(100vh - 105px); overflow: hidden; }
.panel-heading { display: flex; justify-content: space-between; gap: 18px; align-items: flex-start; padding: 22px 24px 16px; border-bottom: 1px solid var(--line); }
.panel-heading > div:first-child { max-width: 900px; }
.panel-heading h1 { margin: 6px 0 0; max-width: 820px; font-size: clamp(34px, 5vw, 62px); line-height: .98; letter-spacing: -.045em; text-wrap: balance; }
.panel-intro { max-width: 680px; margin: 16px 0 0; color: var(--muted); font-size: clamp(16px, 2vw, 20px); line-height: 1.45; }
.eyebrow { margin: 0; color: var(--accent); text-transform: uppercase; letter-spacing: .12em; font-size: 11px; font-weight: 800; }
.panel-state { text-align: right; color: var(--muted); font-size: 12px; }
.panel-state strong { display: block; color: var(--ink); margin-top: 3px; }

.section-nav { display: flex; gap: 8px; padding: 12px 18px; border-bottom: 1px solid var(--line); background: rgba(248,249,251,.96); position: sticky; top: 68px; z-index: 10; backdrop-filter: blur(12px); }
.section-nav-link { min-height: 40px; display: inline-flex; align-items: center; padding: 8px 12px; border: 1px solid transparent; border-radius: 10px; color: var(--muted); font-weight: 750; text-decoration: none; transition: color .15s ease-out, background-color .15s ease-out, border-color .15s ease-out; }
.section-nav-link:hover { color: var(--ink); background: var(--surface); border-color: #aeb9c7; }
.section-nav-link.is-active { color: #173a82; background: var(--accent-soft); border-color: #b9c9ed; }
.explanation-scroll { padding: 28px 22px 44px; }
.continuous-section { scroll-margin-top: 138px; }
.continuous-section + .continuous-section { margin-top: clamp(48px, 8vw, 96px); padding-top: clamp(32px, 5vw, 60px); border-top: 1px solid var(--line); }
.continuous-section-heading { max-width: 760px; margin: 0 0 24px; }
.continuous-section-heading h2 { margin: 6px 0 10px; font-size: clamp(28px, 4vw, 46px); line-height: 1.04; letter-spacing: -.035em; text-wrap: balance; }
.continuous-section-heading > p:last-child { margin: 0; color: var(--muted); line-height: 1.55; }
.continuous-subsection { margin-top: 32px; }

.hero-card { padding: 28px; border-radius: 18px; background: #1c2838; color: white; display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; box-shadow: 0 18px 45px rgba(17, 29, 45, 0.16), 0 4px 12px rgba(17, 29, 45, 0.12); }
.hero-card h2 { font-size: clamp(23px, 3vw, 35px); margin: 10px 0; line-height: 1.12; }
.hero-card p { color: #d9e1ed; max-width: 780px; }
.hero-metric { width: 145px; aspect-ratio: 1; border: 1px solid rgba(255,255,255,.22); border-radius: 50%; display: grid; place-content: center; text-align: center; }
.hero-metric strong { font-size: 42px; }
.hero-metric span { font-size: 11px; max-width: 100px; }

.flow { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 10px; margin: 18px 0; }
.flow-step { min-height: 105px; text-align: left; display: grid; align-content: space-between; padding: 14px; background: var(--surface-soft); }
.flow-step strong { display: block; margin: 5px 0; }
.flow-step small { color: var(--muted); }
.step-number { color: var(--accent); font-weight: 800; }

.callout, .loop-card, .section-intro, .agent-action-form, .principle-card { border: 1px solid var(--line); border-radius: 15px; padding: 18px; margin: 16px 0; background: var(--surface-soft); }
.loop-card { display: grid; grid-template-columns: minmax(260px, .8fr) 1fr; gap: 18px; align-items: center; }
.loop-visual { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.loop-visual span { background: var(--accent-soft); color: #234f9c; padding: 7px 10px; border-radius: 999px; font-size: 12px; }
.inline-action { margin-top: 8px; color: var(--accent); }

.role-grid, .workspace-contract-grid, .persistence-grid, .boundary-grid, .grounding-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 12px; }
.role-card, .contract-card, .persistence-grid article, .boundary-grid article, .grounding-grid article { border: 1px solid var(--line); border-radius: 14px; padding: 16px; background: white; }
.webmcp-status-list { display: grid; gap: 6px; margin-top: 12px; color: var(--muted); font-size: 13px; line-height: 1.45; }
.webmcp-status-list span { display: block; }
.role-index { width: 32px; height: 32px; display: grid; place-items: center; border-radius: 10px; background: var(--accent-soft); color: var(--accent); font-weight: 800; }

.layer-diagram { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 10px; align-items: center; margin: 18px 0; }
.layer-diagram article { border: 1px solid var(--line); border-radius: 14px; padding: 15px; min-height: 115px; }
.layer-diagram span { color: var(--accent); font-weight: 800; }
.layer-diagram strong, .layer-diagram small { display: block; margin-top: 7px; }
.layer-diagram small { color: var(--muted); }

.form-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 14px 0; }
.form-grid label { display: grid; gap: 6px; color: var(--muted); font-size: 13px; }
.form-grid input, .form-grid textarea, .form-grid select, .chat-form input { width: 100%; border: 1px solid var(--line); border-radius: 10px; background: white; color: var(--ink); padding: 10px 11px; }
.wide-field { grid-column: 1 / -1; }
.form-actions { display: flex; gap: 9px; align-items: center; flex-wrap: wrap; }
.action-feedback { color: var(--muted); font-size: 13px; }

.local-block-slot { display: grid; gap: 10px; margin: 10px 0; }
.workspace-view-toggle { display: flex; gap: 6px; margin: 8px 0; }
.workspace-view-toggle button[aria-pressed="true"] { background: var(--accent); color: #fff; }
.workflow-diagram { margin: 20px 0; padding: 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.workflow-diagram figcaption { display: flex; justify-content: space-between; gap: 12px; }
.workflow-diagram figcaption span { color: var(--muted); font-size: 13px; }
.workflow-diagram-nodes { display: flex; align-items: center; gap: 12px; margin: 16px 0; flex-wrap: wrap; }
.workflow-diagram-nodes span { padding: 9px 12px; border: 1px solid var(--line); border-radius: 9px; background: var(--accent-soft); font-weight: 700; }
.agent-cta { margin-top: 28px; padding: clamp(22px, 4vw, 34px); border: 1px solid #b9c9ed; border-radius: 18px; background: var(--accent-soft); box-shadow: 0 16px 36px rgba(49, 103, 216, .10), 0 3px 8px rgba(49, 103, 216, .08); }
.agent-cta h3 { max-width: 650px; margin: 8px 0 20px; font-size: clamp(24px, 3vw, 34px); line-height: 1.15; letter-spacing: -.025em; text-wrap: balance; }
.developer-details { margin-top: 32px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface-soft); overflow: clip; }
.developer-details > summary { min-height: 48px; display: flex; align-items: center; gap: 10px; padding: 12px 16px; cursor: pointer; color: var(--ink); font-weight: 800; list-style-position: inside; }
.developer-details > summary:hover { background: #eef2f7; }
.developer-details[open] > summary { border-bottom: 1px solid var(--line); }
.developer-details-body { padding: 18px; }
.developer-caveat { margin: 0 0 16px; padding: 12px 14px; border-left: 4px solid var(--warning); background: #fff8e7; color: var(--muted); }
.developer-details .workspace-contract-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.developer-details .contract-card ul { margin: 12px 0 0; padding-left: 20px; color: var(--muted); }
.developer-details .contract-card li + li { margin-top: 7px; }
.developer-details .browser-agent-note { margin: 16px 0; }
.developer-details .agent-action-form { margin: 18px 0 0; background: white; }
.local-explanation { border: 1px solid #b9c9ed; background: #f2f6ff; border-radius: 14px; padding: 15px; }
.local-warning { border-color: #e3c37f; background: #fff8e7; }
.local-explanation-header { display: flex; justify-content: space-between; gap: 15px; }
.local-explanation h3 { margin: 3px 0 0; }
.local-label { color: var(--accent); font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.local-remove { color: var(--danger); align-self: start; }
.local-body { white-space: pre-wrap; }
.local-meta { display: flex; gap: 8px; color: var(--muted); font-size: 11px; flex-wrap: wrap; }
.local-meta span, .local-meta strong { border: 1px solid var(--line); border-radius: 999px; padding: 3px 7px; }
.local-sources { color: var(--muted); font-size: 12px; }
.is-focused { outline: 4px solid var(--focus); outline-offset: 4px; }
.workspace-alert { margin: 14px 22px 0; border: 1px solid #e3c37f; background: #fff8e7; border-radius: 12px; padding: 10px 12px; }

.typed-callout-body { margin: 12px 0; white-space: pre-wrap; line-height: 1.55; }
.typed-callout-body[data-tone="warning"] { border-left: 3px solid #e3c37f; padding-left: 12px; }
.typed-callout-body[data-tone="insight"] { border-left: 3px solid var(--accent); padding-left: 12px; }
.typed-comparison-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 10px; margin: 12px 0; }
.typed-comparison-column { border: 1px solid var(--line); background: white; border-radius: 12px; padding: 12px; }
.typed-comparison-column h4 { margin: 0 0 8px; }
.typed-comparison-column ul { margin: 0; padding-left: 20px; }
.typed-workflow, .typed-timeline { list-style: none; margin: 12px 0; padding: 0; display: grid; gap: 9px; }
.typed-workflow-step, .typed-timeline-item { position: relative; border: 1px solid var(--line); background: white; border-radius: 12px; padding: 12px 14px; }
.typed-workflow-step:not(:last-child)::after { content: "↓"; display: block; position: absolute; left: 16px; bottom: -17px; z-index: 2; color: var(--accent); font-weight: 800; }
.typed-workflow-step p, .typed-timeline-item p { margin: 5px 0 0; color: var(--muted); }
.typed-timeline-item { display: grid; grid-template-columns: minmax(90px, .25fr) 1fr; gap: 12px; align-items: start; }
.typed-timeline-label { color: var(--accent); }
.typed-diagram { display: grid; gap: 10px; margin: 12px 0; }
.typed-diagram-nodes { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.typed-diagram-node { border: 1px solid #c8d5f1; background: white; border-radius: 12px; padding: 12px; text-align: center; }
.typed-diagram-node strong, .typed-diagram-node small { display: block; }
.typed-diagram-node small { color: var(--muted); margin-top: 5px; }
.typed-diagram-edges { list-style: none; margin: 0; padding: 10px 12px; border: 1px dashed #b9c9ed; border-radius: 10px; color: var(--muted); font-size: 12px; }
.typed-diagram-edges li + li { margin-top: 5px; }

.conversation-panel { display: grid; grid-template-rows: auto 1fr auto auto; }
.conversation-heading { padding: 18px 20px; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; gap: 12px; }
.conversation-heading h2 { margin: 3px 0 0; }
.chat-messages { min-height: 250px; max-height: calc(100vh - 450px); overflow: auto; padding: 18px; display: grid; gap: 12px; align-content: start; background: var(--surface-soft); }
.message { max-width: 90%; border-radius: 14px; padding: 12px 14px; }
.message strong { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; }
.message p { margin: 5px 0 0; white-space: pre-wrap; }
.message-user { justify-self: end; background: var(--accent); color: white; }
.message-agent { justify-self: start; background: white; border: 1px solid var(--line); }
.chat-form { display: grid; grid-template-columns: 1fr auto; gap: 9px; padding: 14px; border-top: 1px solid var(--line); }
.simulation-note { margin: 0; padding: 0 16px 14px; color: var(--muted); font-size: 12px; }
.conversation-panel .agent-action-form { margin: 0 14px 14px; max-height: 390px; overflow: auto; }

.source-drawer { position: fixed; inset: 68px 0 0 auto; width: min(420px, 92vw); background: white; border-left: 1px solid var(--line); box-shadow: var(--shadow); padding: 22px; z-index: 30; overflow: auto; }
.source-drawer-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.source-drawer-heading h2 { margin: 0; }
.source-drawer li { margin: 8px 0; }
dialog { width: min(760px, 92vw); border: 1px solid var(--line); border-radius: 16px; padding: 0; box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(24,32,43,.45); }
.dialog-heading { display: flex; justify-content: space-between; align-items: center; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.dialog-heading h2 { margin: 0; }
#history-output { margin: 0; padding: 18px; max-height: 65vh; overflow: auto; white-space: pre-wrap; }

@media (max-width: 1050px) {
  .workspace { grid-template-columns: 1fr; }
  .explanation-panel, .conversation-panel { min-height: auto; }
  .explanation-scroll, .chat-messages { max-height: none; }
}
@media (max-width: 720px) {
  .topbar { align-items: flex-start; }
  .workspace { padding: 8px; }
  .panel-heading, .explanation-scroll { padding: 16px; }
  .panel-heading { display: block; }
  .panel-state { display: none; }
  .panel-heading h1 { font-size: clamp(32px, 10vw, 46px); }
  .section-nav { top: 68px; padding: 10px 16px; overflow-x: auto; }
  .section-nav-link { white-space: nowrap; }
  .hero-card, .loop-card { grid-template-columns: 1fr; }
  .hero-metric { display: none; }
  .flow, .role-grid, .workspace-contract-grid, .persistence-grid, .boundary-grid, .grounding-grid { grid-template-columns: 1fr; }
  .developer-details .workspace-contract-grid { grid-template-columns: 1fr; }
  .layer-diagram { grid-template-columns: 1fr; }
  .layer-diagram > b { text-align: center; }
  .form-grid { grid-template-columns: 1fr; }
  .wide-field { grid-column: auto; }
  .developer-details-body { padding: 14px; }
  .typed-timeline-item { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: .01ms !important; }
}