:root {
  --ink: #193b35;
  --ink-soft: #31564e;
  --muted: #6f8179;
  --paper: #f4f3eb;
  --cream: #fcfbf6;
  --sage: #dce8dd;
  --sage-deep: #9bb9a4;
  --sand: #eee4d2;
  --coral: #d8806b;
  --line: rgba(25, 59, 53, .17);
  --line-strong: rgba(25, 59, 53, .32);
  --shadow: 0 28px 70px rgba(38, 72, 63, .12);
  --display: Georgia, 'Times New Roman', serif;
  --body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--body);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { min-width: 320px; margin: 0; background: var(--paper); }
a { color: inherit; }
button, input, select, textarea { font: inherit; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible { outline: 3px solid rgba(216, 128, 107, .72); outline-offset: 3px; }
[hidden] { display: none !important; }

.section-shell { width: min(1160px, calc(100% - 3rem)); margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; padding: 1.15rem max(1.5rem, calc((100vw - 1160px) / 2)); background: rgba(244, 243, 235, .9); border-bottom: 1px solid var(--line); backdrop-filter: blur(18px); }
.wordmark { display: inline-flex; align-items: center; gap: .7rem; color: var(--ink); font: 600 1rem/1 var(--body); letter-spacing: .02em; text-decoration: none; }
.mark { position: relative; display: inline-block; width: 1.2rem; height: 1.2rem; border: 2px solid var(--coral); border-radius: 50% 50% 48% 48%; }
.mark::after { position: absolute; top: .12rem; right: -.35rem; width: .36rem; height: .36rem; border-radius: 50%; background: var(--sage-deep); content: ''; }
.header-actions { display: flex; align-items: center; gap: 1.2rem; }
.header-link, .text-link { color: var(--ink-soft); font: 600 .78rem/1.35 var(--body); text-decoration: none; }
.header-link:hover, .text-link:hover { color: var(--coral); }
.menu-button { display: inline-flex; align-items: center; gap: .65rem; padding: .55rem 0; border: 0; color: var(--ink); background: transparent; cursor: pointer; font: 600 .78rem/1 var(--body); }
.menu-icon { display: inline-grid; width: 1.5rem; height: 1.5rem; place-items: center; border: 1px solid var(--line-strong); border-radius: 50%; font-size: .78rem; line-height: 1; }
.menu { position: absolute; top: calc(100% + .75rem); right: max(1.5rem, calc((100vw - 1160px) / 2)); display: grid; min-width: 15rem; gap: .15rem; padding: .7rem; border: 1px solid var(--line); border-radius: 1rem; background: var(--cream); box-shadow: var(--shadow); }
.menu-group { display: grid; gap: .15rem; padding-bottom: .5rem; border-bottom: 1px solid var(--line); }
.menu-group-label { padding: .45rem .8rem .2rem; color: var(--muted); font: 700 .65rem/1.3 var(--body); letter-spacing: .12em; text-transform: uppercase; }
.menu a { padding: .75rem .8rem; border-radius: .65rem; color: var(--ink-soft); font: 600 .78rem/1.3 var(--body); text-decoration: none; }
.menu a:hover, .menu a:focus-visible { color: var(--ink); background: var(--sage); }

.eyebrow { margin: 0 0 1.1rem; color: var(--muted); font: 700 .67rem/1.3 var(--body); letter-spacing: .16em; text-transform: uppercase; }
h1, h2, h3, h4, p, blockquote { margin-top: 0; }
h1, h2, h3, h4 { font-family: var(--display); font-weight: 400; letter-spacing: -.045em; }
h1 { max-width: 10ch; margin-bottom: 1.5rem; font-size: clamp(3.4rem, 8vw, 7.4rem); line-height: .9; }
h2 { margin-bottom: 1.1rem; font-size: clamp(2.2rem, 5vw, 4.3rem); line-height: .98; }
h3 { margin-bottom: .8rem; font-size: clamp(1.6rem, 3vw, 2.35rem); line-height: 1.02; }
h4 { margin-bottom: .65rem; font-size: 1.55rem; }
p { color: var(--ink-soft); font-size: 1rem; line-height: 1.7; }

.hero { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(300px, .92fr); align-items: center; gap: clamp(3rem, 8vw, 8rem); min-height: min(790px, 82vh); padding-block: 7rem 6rem; }
.hero h1 em { color: var(--coral); font-style: normal; }
.hero-lede { max-width: 35rem; margin-bottom: 0; font-size: clamp(1.15rem, 2vw, 1.45rem); line-height: 1.55; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1.2rem; margin-top: 2rem; }
.microcopy { margin-bottom: 0; color: var(--muted); font: .75rem/1.55 var(--body); }
.hero-preview { align-self: end; padding: clamp(1.5rem, 4vw, 2.5rem); border: 1px solid var(--line); border-radius: 1.5rem; background: var(--sage); box-shadow: var(--shadow); transform: rotate(1.2deg); }
.preview-topline { display: flex; align-items: center; justify-content: space-between; padding-bottom: 1.25rem; border-bottom: 1px solid var(--line); color: var(--ink); font: 700 .7rem var(--body); letter-spacing: .08em; text-transform: uppercase; }
.preview-dot { width: .65rem; height: .65rem; border-radius: 50%; background: var(--coral); }
.preview-greeting { margin: 1.5rem 0 2rem; color: var(--ink); font: 400 clamp(1.3rem, 2.8vw, 1.9rem)/1.15 var(--display); letter-spacing: -.03em; }
.preview-list { display: grid; gap: .75rem; }
.preview-list div { display: grid; grid-template-columns: 2rem 1fr auto; gap: .65rem; align-items: center; padding: .85rem 0; border-top: 1px solid var(--line); color: var(--ink-soft); font: 600 .78rem var(--body); }
.preview-number { color: var(--coral); font: .72rem var(--body); }
.preview-note { margin: 2rem 0 0; padding-top: 1.25rem; border-top: 1px solid var(--line); color: var(--muted); font: .78rem/1.5 var(--body); }
.principle-band { padding-block: 5rem; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
blockquote { max-width: 49rem; margin-bottom: 0; color: var(--ink); font: 400 clamp(2rem, 4.5vw, 4rem)/1.04 var(--display); letter-spacing: -.04em; }
.architecture-section, .demo-section, .boundary-section { padding-block: 7rem; }
.section-heading { max-width: 44rem; }
.section-heading > p:last-child { max-width: 38rem; }
.architecture-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .8rem; margin-top: 3rem; }
.architecture-card { min-height: 12.5rem; padding: 1.25rem; border: 1px solid var(--line); border-radius: 1rem; }
.architecture-card:nth-child(even) { background: var(--sand); }
.architecture-card:nth-child(odd) { background: var(--sage); }
.architecture-card > span { color: var(--coral); font: 700 .7rem var(--body); }
.architecture-card h3 { margin: 2.8rem 0 .45rem; font-size: 1.6rem; }
.architecture-card p { margin-bottom: 0; font-size: .85rem; line-height: 1.45; }
.demo-section { border-top: 1px solid var(--line); }
.demo-heading { display: flex; align-items: end; justify-content: space-between; gap: 2rem; max-width: none; }
.demo-heading h2 { margin-bottom: 0; }
.demo-boundary { max-width: 25rem; margin-bottom: .25rem; font-size: .9rem; }
.app-shell { margin-top: 2.8rem; overflow: hidden; border: 1px solid var(--line-strong); border-radius: 1.5rem; background: var(--cream); box-shadow: var(--shadow); }
.app-shell.is-engaged { box-shadow: 0 30px 80px rgba(38, 72, 63, .18); }
.app-bar { display: flex; align-items: start; justify-content: space-between; gap: 1rem; padding: 1.8rem clamp(1.25rem, 4vw, 3rem) 1.4rem; background: var(--sage); }
.app-kicker { margin: 0 0 .25rem; color: var(--muted); font: 700 .65rem var(--body); letter-spacing: .14em; text-transform: uppercase; }
.app-bar h3 { margin: 0; font-size: 2.2rem; }
.app-state { padding: .4rem .65rem; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font: 700 .65rem var(--body); }
.app-tabs { display: flex; gap: .25rem; padding: .75rem clamp(1.25rem, 4vw, 3rem); border-bottom: 1px solid var(--line); background: var(--cream); overflow-x: auto; }
.app-tab { flex: 0 0 auto; padding: .65rem .8rem; border: 0; border-radius: 999px; color: var(--muted); background: transparent; cursor: pointer; font: 700 .72rem var(--body); }
.app-tab:hover, .app-tab.is-active { color: var(--ink); background: var(--sand); }
.app-view { padding: clamp(1.3rem, 5vw, 3.25rem); }
.app-progress { display: flex; gap: .4rem; margin-bottom: 2.2rem; }
.app-progress span { width: 2.2rem; height: .2rem; border-radius: 99px; background: var(--line); }
.app-progress span.is-current { background: var(--coral); }
.flow-screen { max-width: 49rem; }
.flow-screen h3 { max-width: 15ch; font-size: clamp(2.2rem, 5vw, 4rem); }
.flow-intro { max-width: 36rem; }
.focus-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; margin: 2.2rem 0 1rem; }
.focus-choice { display: grid; gap: .35rem; min-height: 6rem; padding: 1rem; border: 1px solid var(--line); border-radius: .9rem; color: var(--ink); background: var(--paper); cursor: pointer; text-align: left; transition: border-color .18s ease, transform .18s ease, background .18s ease; }
.focus-choice:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.focus-choice[aria-pressed='true'] { border-color: var(--coral); background: var(--sand); box-shadow: inset 0 0 0 2px rgba(216, 128, 107, .16); }
.focus-choice span { font: 700 .9rem var(--body); }
.focus-choice small { color: var(--muted); font: .74rem/1.4 var(--body); }
.selection-status { min-height: 1.4rem; margin: 0; color: var(--muted); font: .76rem var(--body); }
.flow-actions, .today-actions, .form-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; margin-top: 1.8rem; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: .8rem; padding: .9rem 1.25rem; border: 0; border-radius: 999px; cursor: pointer; font: 700 .78rem var(--body); text-decoration: none; transition: transform .18s ease, background .18s ease; }
.button:hover:not(:disabled) { transform: translateY(-2px); }
.button:disabled { cursor: not-allowed; opacity: .42; }
.button-primary { color: var(--cream); background: var(--ink); }
.text-button { padding: .5rem 0; border: 0; color: var(--muted); background: transparent; cursor: pointer; font: 700 .76rem var(--body); }
.text-button:hover { color: var(--ink); }
.prompt-card, .today-card { margin-top: 2rem; padding: clamp(1.25rem, 4vw, 2.4rem); border: 1px solid var(--line); border-radius: 1rem; background: var(--sage); }
.prompt-card { display: grid; grid-template-columns: 2.5rem 1fr; gap: 1rem; align-items: start; }
.prompt-mark { display: grid; width: 2rem; height: 2rem; place-items: center; border: 1px solid var(--coral); border-radius: 50%; color: var(--coral); font: 1.2rem var(--display); }
.prompt-card p, .today-card p { margin-bottom: 1rem; color: var(--ink); font: 400 clamp(1.4rem, 3vw, 2.2rem)/1.12 var(--display); }
.today-card .text-link { display: inline-block; }
.quiet-action { display: grid; flex: 1 1 14rem; gap: .35rem; min-width: 14rem; padding: 1rem; border: 1px solid var(--line); border-radius: .9rem; color: var(--ink); background: var(--paper); cursor: pointer; text-align: left; }
.quiet-action:hover { border-color: var(--line-strong); background: var(--sand); }
.quiet-action strong { font: 700 .83rem var(--body); }
.quiet-action span { color: var(--muted); font: .75rem/1.4 var(--body); }
.release-panel, .note-panel { margin-top: 1.5rem; padding: 1.25rem; border: 1px solid var(--line); border-radius: .9rem; background: var(--sand); }
.release-panel h4 { margin-bottom: 0; }
.field { display: grid; gap: .45rem; margin-top: 1rem; }
.field > span { color: var(--muted); font: 700 .72rem var(--body); }
.field textarea, .field input, .field select { width: 100%; padding: .8rem .85rem; border: 1px solid var(--line); border-radius: .55rem; color: var(--ink); background: rgba(252, 251, 246, .85); font: .95rem/1.5 var(--body); }
.field textarea { resize: vertical; }
.nothing-required { display: flex; gap: .55rem; align-items: center; margin: 2rem 0 0; color: var(--muted); font: .75rem var(--body); }
.nothing-required span { color: var(--coral); }
.completion-screen { padding-block: 3rem 4rem; }
.staged-view { min-height: 22rem; }
.staged-view h3 { max-width: 15ch; }
.staged-card { display: grid; gap: .35rem; max-width: 34rem; margin-top: 2rem; padding: 1.2rem; border-left: 3px solid var(--coral); background: var(--sand); }
.staged-card strong { font: 700 .72rem var(--body); text-transform: uppercase; letter-spacing: .08em; }
.staged-card span { color: var(--ink-soft); font: .9rem/1.5 var(--body); }
.boundary-section { padding-top: 0; }
.boundary-card { padding: clamp(1.5rem, 5vw, 3.5rem); border-radius: 1.5rem; background: var(--ink); box-shadow: var(--shadow); }
.boundary-card .eyebrow, .boundary-card h2, .boundary-card p { color: var(--cream); }
.boundary-card h2 { max-width: 17ch; }
.boundary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 2.5rem; }
.boundary-grid p { margin-bottom: 0; padding-top: 1rem; border-top: 1px solid rgba(252, 251, 246, .28); color: rgba(252, 251, 246, .78); font-size: .9rem; }
.boundary-grid strong { color: var(--cream); }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: 1.5rem 2.5rem; border-top: 1px solid var(--line); color: var(--muted); font: .7rem/1.5 var(--body); }
.footer-nav { display: flex; gap: 1rem; }
.footer-nav a { color: var(--ink); font-weight: 700; text-decoration: none; }
.footer-nav a:hover, .footer-nav a:focus-visible { color: var(--coral); text-decoration: underline; text-underline-offset: .2em; }

.about-page, .wabble-page, .correspondence-page { padding-block: 6rem 8rem; }
.about-page > h1, .wabble-page > h1, .correspondence-page > h1 { max-width: 15ch; }
.about-intro { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(2rem, 7vw, 8rem); padding-block: 2rem 6rem; }
.about-intro .lead { color: var(--ink); font: 400 clamp(1.55rem, 3vw, 2.4rem)/1.15 var(--display); letter-spacing: -.03em; }
.story-card, .wabble-card, .qa-card { padding: clamp(1.4rem, 4vw, 3.25rem); border: 1px solid var(--line); border-radius: 1.35rem; background: var(--cream); box-shadow: var(--shadow); }
.story-card { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(1.5rem, 5vw, 5rem); margin-bottom: 2rem; }
.story-card h2, .wabble-card h2 { margin-bottom: 0; }
.story-card-copy p:last-child, .wabble-card-copy p:last-child { margin-bottom: 0; }
.wabble-card { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(1.5rem, 5vw, 5rem); }
.wabble-card-note { padding-top: 1rem; border-top: 1px solid var(--line); color: var(--muted); font: .85rem/1.55 var(--body); }
.about-boundary { display: grid; grid-template-columns: repeat(3, 1fr); gap: .8rem; margin-top: 2rem; }
.about-boundary article { padding: 1.25rem; border: 1px solid var(--line); border-radius: 1rem; background: var(--sage); }
.about-boundary article:nth-child(2) { background: var(--sand); }
.about-boundary h3 { margin-bottom: .55rem; font-size: 1.45rem; }
.about-boundary p { margin-bottom: 0; font-size: .85rem; }
.about-choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.about-choice-card { display: flex; min-height: 18rem; flex-direction: column; padding: clamp(1.4rem, 4vw, 3rem); border: 1px solid var(--line); border-radius: 1.35rem; color: var(--ink); text-decoration: none; box-shadow: var(--shadow); transition: transform .2s ease, box-shadow .2s ease; }
.about-choice-card:hover, .about-choice-card:focus-visible { transform: translateY(-.2rem); box-shadow: 0 1.2rem 2.5rem rgba(28, 63, 58, .12); }
.about-choice-card h2 { max-width: 10ch; margin-bottom: .8rem; }
.about-choice-card p:not(.eyebrow) { max-width: 34ch; color: var(--ink-soft); }
.about-choice-card .text-link { margin-top: auto; }
.workspace-actions { position: relative; display: flex; align-items: center; gap: .8rem; }
.workspace-role { max-width: 12rem; overflow: hidden; color: var(--muted); font: 700 .65rem/1.2 var(--body); letter-spacing: .08em; text-overflow: ellipsis; text-transform: uppercase; white-space: nowrap; }
.gear-menu { right: 0; top: calc(100% + 1rem); }
.workspace-page { padding-block: 6rem 8rem; }
.workspace-page h1 { max-width: 15ch; }
.workspace-gate { max-width: 46rem; }
.workspace-gate .form-actions { align-items: center; }
.workspace-content { max-width: 64rem; }
.workspace-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 2.5rem; }
.owner-preview-page { padding-block: 5rem 8rem; }
.owner-preview-page > h1 { max-width: 15ch; }
.owner-preview-lede { max-width: 48rem; color: var(--ink-soft); font: 400 clamp(1.25rem, 2.5vw, 1.8rem)/1.35 var(--display); }
.conversation-steps, .owner-question-grid, .suggestion-lanes { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .8rem; margin-top: 2.5rem; }
.conversation-steps article, .suggestion-lanes article { padding: 1.25rem; border: 1px solid var(--line); border-radius: 1rem; background: var(--cream); }
.conversation-steps span { color: var(--coral); font: 700 .7rem/1 var(--body); letter-spacing: .12em; }
.conversation-steps h2 { margin: .7rem 0 .5rem; font-size: 1.3rem; }
.conversation-steps p, .suggestion-lanes p { margin-bottom: 0; font-size: .85rem; }
.owner-question-section, .suggestion-board { margin-top: 6rem; }
.owner-question-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.owner-question-card { padding: 1.35rem; border: 1px solid var(--line); border-radius: 1rem; }
.owner-question-card h3 { margin-bottom: .9rem; font-size: 1.25rem; }
.owner-question-card ul { margin: 0; padding-left: 1.1rem; color: var(--ink-soft); font-size: .86rem; }
.owner-question-card li + li { margin-top: .55rem; }
.suggestion-lanes { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.suggestion-lanes h3 { margin: .8rem 0 .5rem; font-size: 1.1rem; }
.suggestion-draft { grid-column: span 1; }
.suggestion-form .field { margin-top: 1.1rem; }
.suggestion-form .button { margin-top: 1rem; }
.suggestion-form .microcopy { min-height: 1.2rem; margin: .8rem 0 0; }
.suggestion-response { margin-top: 1rem; padding: 1rem; border: 1px solid var(--line); border-radius: .75rem; background: var(--sage); }
.suggestion-response p { font-size: .78rem; }
.suggestion-response .suggestion-echo-label { margin-bottom: .55rem; color: var(--muted); font: 700 .65rem/1.3 var(--body); letter-spacing: .1em; text-transform: uppercase; }
.suggestion-response blockquote { margin: 0 0 .85rem; padding-left: .8rem; border-left: 3px solid var(--coral); color: var(--ink); font: 400 1.05rem/1.4 var(--display); overflow-wrap: anywhere; }
.status-pill { display: inline-block; padding: .35rem .55rem; border-radius: 999px; background: var(--sage); color: var(--ink-soft); font: 700 .62rem/1 var(--body); letter-spacing: .08em; text-transform: uppercase; }
.status-pill-final { background: var(--coral); color: var(--cream); }
.owner-preview-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; margin-top: 3rem; }

.correspondence-page > .hero-copy { max-width: 38rem; font-size: 1.25rem; }
.notice { margin: 1.5rem 0; padding: .95rem 1.1rem; border: 1px solid var(--line); border-radius: .75rem; background: rgba(252, 251, 246, .76); color: var(--muted); font: .78rem/1.5 var(--body); }
.notice-error { border-color: rgba(173, 82, 65, .45); color: #8a4c40; background: rgba(255, 240, 235, .74); }
.mode-bar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin: 1.5rem 0; padding: 1rem 1.1rem; border: 1px solid var(--line); border-radius: .75rem; background: var(--sage); font: .78rem/1.4 var(--body); }
.mode-bar strong, .mode-bar span { display: block; }
.mode-bar strong { color: var(--ink); }
.mode-bar > div > span { color: var(--muted); }
.switch-label { display: inline-flex; align-items: center; gap: .55rem; cursor: pointer; color: var(--muted); }
.switch-label input { position: absolute; opacity: 0; pointer-events: none; }
.switch-track { width: 2.5rem; height: 1.35rem; padding: .15rem; border-radius: 999px; background: var(--muted); transition: background .2s ease; }
.switch-track::after { display: block; width: 1.05rem; height: 1.05rem; border-radius: 50%; background: var(--cream); content: ''; transition: transform .2s ease; }
.switch-label input:checked + .switch-track { background: var(--coral); }
.switch-label input:checked + .switch-track::after { transform: translateX(1.15rem); }
.qa-card { margin-top: 1.5rem; }
.qa-card h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
.category-menu { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1.5rem 0; }
.category-button { padding: .55rem .8rem; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); background: transparent; cursor: pointer; font: .72rem var(--body); }
.category-button[aria-pressed='true'] { border-color: var(--coral); color: var(--ink); background: rgba(216, 128, 107, .1); }
.question-list { display: grid; gap: 1rem; }
.question-card { padding: 1.1rem; border: 1px solid var(--line); border-radius: .9rem; background: rgba(220, 232, 221, .25); }
.question-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; }
.question-heading h3 { margin: 0; font-size: 1.25rem; line-height: 1.15; }
.question-revision { flex: 0 0 auto; color: var(--muted); font: .7rem var(--body); }
.question-edit { margin-top: 1rem; padding-top: .9rem; border-top: 1px solid var(--line); }
.question-edit summary { cursor: pointer; color: var(--muted); font: .75rem var(--body); }
.artifact-card { background: var(--sage); }
.artifact-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .65rem 1rem; }
.artifact-links a { color: var(--ink); font: .82rem var(--body); }
.screenshot-preview { max-width: 100%; margin-top: .75rem; border: 1px solid var(--line); border-radius: .75rem; }

@media (max-width: 850px) {
  .hero, .about-intro { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 5rem; }
  .hero-preview { max-width: 34rem; justify-self: end; }
  .architecture-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .architecture-card:last-child { grid-column: span 3; min-height: auto; }
}
@media (max-width: 650px) {
  .section-shell { width: min(100% - 2rem, 1160px); }
  .site-header { padding-inline: 1rem; }
  .header-link { display: none; }
  .menu { right: 1rem; left: 1rem; min-width: 0; }
  h1 { font-size: clamp(3.1rem, 16vw, 5.2rem); }
  .hero { padding-block: 4.5rem 4rem; }
  .hero-preview { transform: none; }
  .architecture-section, .demo-section, .about-page, .wabble-page, .correspondence-page { padding-block: 5rem; }
  .architecture-grid, .boundary-grid, .about-boundary, .story-card, .about-choice-grid, .workspace-grid, .conversation-steps, .owner-question-grid, .suggestion-lanes { grid-template-columns: 1fr; }
  .architecture-card:last-child { grid-column: auto; }
  .demo-heading { display: grid; gap: .5rem; }
  .focus-grid { grid-template-columns: 1fr; }
  .app-view { padding: 1.15rem; }
  .app-tabs { padding-inline: 1rem; }
  .app-bar { padding-inline: 1.15rem; }
  .boundary-card { padding: 1.35rem; }
  .site-footer { flex-direction: column; }
  .mode-bar { align-items: flex-start; flex-direction: column; }
  .artifact-links { grid-template-columns: 1fr; }
}