:root {
  color-scheme: light;
  --canvas: #f5f0e5;
  --surface: #fffdf7;
  --surface-soft: #eee8d9;
  --ink: #26372f;
  --muted: #697269;
  --primary: #356859;
  --primary-dark: #244d41;
  --primary-soft: #e1ede4;
  --teal: #4c7868;
  --teal-soft: #e3eee6;
  --success: #397052;
  --warning: #9b5b27;
  --danger: #9f3f32;
  --line: #ddd4c3;
  --line-strong: #c7baa3;
  --ochre: #b96f36;
  --page: 1180px;
  --shadow: 0 18px 60px rgba(28, 39, 68, .09);
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { background: var(--canvas); scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--canvas); font: 16px/1.55 var(--sans); }
button, input, select { font: inherit; }
button { cursor: pointer; }
p { margin: 0; }
h1, h2, h3 { margin: 0; color: var(--ink); font-family: Georgia, "Times New Roman", serif; font-weight: 650; letter-spacing: -.035em; line-height: 1.05; }
h1 { font-size: clamp(3.1rem, 7vw, 6.8rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 3rem); }
h3 { font-size: 1.08rem; letter-spacing: -.015em; }
[hidden] { display: none !important; }
::selection { color: #fff; background: var(--primary); }

.masthead { width: min(calc(100% - 48px), var(--page)); height: 72px; display: flex; align-items: center; justify-content: space-between; margin: auto; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: .7rem; color: var(--ink); font-size: 1rem; font-weight: 750; text-decoration: none; }
.brand svg { width: 30px; height: 30px; fill: var(--surface); stroke: var(--primary); stroke-width: 1.8; transform: rotate(-5deg); }
.brand svg circle { fill: var(--primary-soft); }
.demo-badge, .badge, .status { display: inline-flex; align-items: center; width: fit-content; min-height: 27px; padding: .25rem .62rem; border-radius: 999px; font-size: .7rem; font-weight: 700; letter-spacing: .04em; }
.demo-badge { color: var(--primary-dark); background: var(--primary-soft); }

main { width: min(calc(100% - 48px), var(--page)); margin: auto; padding: 88px 0 120px; }
.eyebrow { margin-bottom: .8rem; color: var(--ochre); font-size: .72rem; font-weight: 750; letter-spacing: .11em; text-transform: uppercase; }

.hero { padding-bottom: 96px; }
.hero-copy { display: grid; grid-template-columns: 1.2fr .8fr; gap: 2rem 5rem; align-items: end; }
.hero-copy .eyebrow { grid-column: 1 / -1; margin-bottom: -1rem; }
.hero-copy h1 { max-width: 760px; }
.hero-copy > p:last-child { max-width: 430px; padding-bottom: .7rem; color: var(--muted); font-size: 1.14rem; }

.story { display: grid; gap: 16px; margin-top: 58px; }
.story-step { min-height: 230px; display: grid; grid-template-columns: minmax(340px, .95fr) 1.05fr; overflow: visible; background: var(--surface); border: 1px solid var(--line); border-radius: 22px; box-shadow: 0 10px 34px rgba(54,67,48,.07); }
.story-art { width: 100%; height: 230px; display: block; object-fit: cover; border-radius: 21px 0 0 21px; }
.story-step:nth-child(even) .story-art { order: 2; border-radius: 0 21px 21px 0; }
.story-content { display: grid; grid-template-columns: 44px 1fr auto; gap: 1rem; align-items: center; padding: 1.25rem 1.5rem; }
.story-content b { color: var(--ochre); font: 700 .68rem var(--mono); }
.story-content > strong { font-size: clamp(1.25rem, 2.3vw, 1.75rem); letter-spacing: -.025em; }
.help-popover { position: relative; }
.help-popover summary { width: 32px; height: 32px; display: grid; place-items: center; color: var(--muted); background: var(--surface); border: 1px solid var(--line-strong); border-radius: 50%; cursor: pointer; font-weight: 700; list-style: none; }
.help-popover summary::-webkit-details-marker { display: none; }
.help-popover summary:hover, .help-popover summary:focus-visible { color: var(--primary); border-color: var(--primary); outline: none; }
.help-popover p { position: absolute; z-index: 10; top: calc(100% + .55rem); right: 0; width: min(310px, calc(100vw - 48px)); margin: 0; padding: 1rem; color: var(--muted); background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); font-size: .82rem; }

.demo-workspace { padding: 78px 0 0; border-top: 1px solid var(--line); }
.workspace-head { display: grid; grid-template-columns: 1fr minmax(280px, .55fr); gap: 3rem; align-items: end; }
.workspace-head > p { color: var(--muted); }
.progress { display: grid; grid-template-columns: repeat(5, 1fr); margin-top: 42px; border-bottom: 1px solid var(--line); }
.progress span { display: flex; gap: .5rem; padding: 1rem .5rem; color: #98a2b3; border-bottom: 2px solid transparent; font-size: .76rem; }
.progress span b { color: inherit; font-weight: 650; }
.progress span.active { color: var(--primary); border-color: var(--primary); }

.panel { min-height: 270px; margin-top: 18px; padding: 0; overflow: hidden; background: var(--surface); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
.demo-scene { min-height: 430px; display: grid; grid-template-columns: minmax(260px, .36fr) 1fr; }
.demo-scene > figure { min-height: 100%; margin: 0; overflow: hidden; background: var(--surface-soft); }
.demo-scene > figure img { width: 100%; height: 100%; display: block; object-fit: cover; }
.demo-screen-body { min-width: 0; padding: clamp(1.5rem, 4vw, 3rem); }
.panel > p:not(.eyebrow), .fine, .empty, .card p { color: var(--muted); }
.loading { min-height: 160px; display: flex; align-items: center; justify-content: center; gap: .7rem; color: var(--muted); }
.loading span { width: 10px; height: 10px; border-radius: 50%; background: var(--primary); animation: pulse 1s ease-in-out infinite alternate; }
.screen-head, .section-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 2rem; margin-bottom: 1.5rem; }
.screen-head p { max-width: 520px; color: var(--muted); }
.screen-head h2 { margin-top: .25rem; }

.persona { display: grid; grid-template-columns: 48px 1fr; gap: .8rem; align-items: center; margin: 1.7rem 0; padding: 1rem; background: var(--surface-soft); border-radius: 12px; }
.persona-icon { width: 48px; height: 48px; display: grid; place-items: center; color: #fffdf7; background: var(--ochre); border-radius: 50% 50% 45% 45%; font: 800 1rem Georgia, serif; box-shadow: inset 0 -4px 0 rgba(74,48,26,.12); }
.persona small { display: block; color: var(--muted); }
.field { display: grid; gap: .45rem; max-width: 520px; color: var(--muted); font-size: .78rem; font-weight: 650; }
.field input, .chat-form input, .chat-form select { width: 100%; min-height: 46px; padding: .75rem .85rem; color: var(--ink); background: var(--surface); border: 1px solid var(--line-strong); border-radius: 9px; }
.field input:focus, .chat-form input:focus, .chat-form select:focus { border-color: var(--primary); outline: 3px solid rgba(91,74,232,.13); }

.authority-grid, .key-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 1.5rem; }
.card { min-width: 0; padding: 1.15rem; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 12px; text-align: left; }
button.card { transition: border-color .2s, box-shadow .2s, transform .2s; }
button.card:hover { border-color: #7c9a86; box-shadow: 0 8px 22px rgba(53,104,89,.1); transform: translateY(-2px); }
.authority-option.selected { background: var(--primary-soft); border-color: var(--primary); }
.card h3 { margin: .65rem 0 .3rem; }
.card p { font-size: .82rem; }
.status { min-height: 24px; padding: .2rem .5rem; color: var(--muted); background: var(--surface-soft); font-size: .62rem; }
.status.good, .badge { color: var(--success); background: #e9f7f0; }
.selection-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 1.2rem; color: var(--muted); }
.selection-row strong { color: var(--ink); }

button { min-height: 44px; padding: .7rem 1rem; color: var(--ink); background: var(--surface); border: 1px solid var(--line-strong); border-radius: 9px; font-size: .78rem; font-weight: 700; transition: border-color .2s, background .2s, transform .2s; }
button:hover:not(:disabled) { border-color: var(--primary); transform: translateY(-1px); }
button.primary { color: #fff; background: var(--primary); border-color: var(--primary); }
button.primary:hover:not(:disabled) { background: var(--primary-dark); }
button:disabled { cursor: not-allowed; opacity: .45; }
.actions { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: 1.4rem; }
.success-callout, .loss-callout { display: grid; grid-template-columns: 52px 1fr; gap: 1rem; align-items: center; margin: 1.5rem 0; padding: 1.2rem; border-radius: 12px; }
.success-callout { color: #096443; background: var(--teal-soft); }
.loss-callout { color: #7a2e0e; background: #fff4ed; }
.callout-icon { width: 52px; height: 52px; display: grid; place-items: center; background: rgba(255,255,255,.7); border-radius: 50%; font-weight: 800; }

.process-steps { display: grid; gap: .5rem; margin: 1.6rem 0 0; padding: 0; list-style: none; }
.process-steps li { display: grid; grid-template-columns: 28px 1fr; gap: .7rem; align-items: center; padding: .75rem .9rem; color: #98a2b3; background: var(--canvas); border: 1px solid var(--line); border-radius: 9px; }
.process-steps li > span { color: var(--primary); font-weight: 800; }
.process-steps li.active { color: var(--ink); background: var(--primary-soft); border-color: #9fb8a7; }
.process-steps li.done { color: var(--success); }

.technical-panel { margin-top: 24px; overflow: visible; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; }
.technical-panel > summary { min-height: 76px; display: flex; align-items: center; justify-content: space-between; padding: 1rem 1.25rem; cursor: pointer; list-style: none; }
.technical-panel > summary::-webkit-details-marker { display: none; }
.technical-panel > summary span, .technical-panel > summary b, .technical-panel > summary small { display: block; }
.technical-panel > summary small { margin-top: .2rem; color: var(--muted); }
.technical-panel > summary i { color: var(--primary); font-size: 1.3rem; font-style: normal; }
.technical-panel[open] > summary i { transform: rotate(45deg); }
.technical-body { display: grid; gap: 2.5rem; padding: 1.5rem; border-top: 1px solid var(--line); }
.architecture-note { padding: 1rem 1.1rem; color: var(--muted); background: var(--primary-soft); border-radius: 10px; font-size: .82rem; }
.architecture-note strong { display: block; margin-bottom: .25rem; color: var(--primary-dark); }
.raw-values { grid-column: 1 / -1; margin-top: .5rem; border-top: 1px solid var(--line); }
.raw-values > summary { padding: 1rem 0; color: var(--primary); cursor: pointer; font-weight: 700; }
.raw-content { display: grid; gap: 1rem; }
.warning { padding: 1rem; color: #7a2e0e; background: #fff4ed; border-radius: 10px; }
.secret-card { padding: 1rem; background: #111827; border-radius: 10px; }
.secret-card strong, .secret-card small, .secret-card code { display: block; }
.secret-card strong { color: #d0d5dd; font-size: .72rem; }
.secret-card code { max-height: 170px; overflow: auto; margin: .55rem 0; color: #a7f3d0; font: .72rem/1.5 var(--mono); overflow-wrap: anywhere; white-space: pre-wrap; }
.secret-card small { color: #98a2b3; font-size: .68rem; }
.share-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .7rem; }
.secrets-accordion { margin-top: 1.2rem; overflow: hidden; background: #26372f; border: 1px solid #3f5549; border-radius: 12px; }
.secrets-accordion > summary { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .9rem 1rem; color: #f7f1e5; cursor: pointer; list-style: none; }
.secrets-accordion > summary::-webkit-details-marker { display: none; }
.secrets-accordion > summary span, .secrets-accordion > summary strong, .secrets-accordion > summary small { display: block; }
.secrets-accordion > summary strong { font-size: .8rem; }
.secrets-accordion > summary small { margin-top: .18rem; color: #cbd6cf; font-size: .7rem; }
.secrets-accordion > summary i { width: 38px; height: 22px; position: relative; flex: 0 0 auto; background: #687a70; border-radius: 999px; }
.secrets-accordion > summary i::after { width: 16px; height: 16px; position: absolute; top: 3px; left: 3px; content: ""; background: #fffdf7; border-radius: 50%; transition: transform .2s; }
.secrets-accordion[open] > summary i { background: #d18a51; }
.secrets-accordion[open] > summary i::after { transform: translateX(16px); }
.secrets-accordion .hide-secrets, .secrets-accordion[open] .show-secrets { display: none; }
.secrets-accordion[open] .hide-secrets { display: block; }
.secrets-content { display: grid; gap: .8rem; padding: 1rem; border-top: 1px solid #52645a; }
.secrets-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .7rem; }
.end-nav { display: flex; justify-content: space-between; gap: .7rem; margin-top: 1.8rem; padding-top: 1.2rem; border-top: 1px solid var(--line); }
.messages { min-height: 110px; max-height: 260px; overflow: auto; padding: .8rem; background: var(--canvas); border-radius: 10px; }
.message { margin: .5rem 0; padding: .75rem; background: var(--surface); border-left: 3px solid var(--teal); border-radius: 6px; }
.message small { display: block; color: var(--muted); }
.chat-form { display: grid; grid-template-columns: 190px 1fr auto; gap: .6rem; margin-top: .8rem; }
.code { display: block; padding: .7rem; overflow-wrap: anywhere; color: var(--primary-dark); background: var(--primary-soft); border-radius: 8px; font: .8rem var(--mono); }
dl { display: grid; grid-template-columns: 150px 1fr; gap: .6rem 1rem; }
dt { color: var(--muted); }
dd { margin: 0; }

footer { width: min(calc(100% - 48px), var(--page)); display: flex; justify-content: space-between; gap: 2rem; margin: auto; padding: 34px 0; color: var(--muted); border-top: 1px solid var(--line); font-size: .72rem; }

@keyframes pulse { to { opacity: .25; transform: scale(.75); } }

@media (max-width: 820px) {
  .hero-copy, .workspace-head { grid-template-columns: 1fr; gap: 1.5rem; }
  .hero-copy .eyebrow { margin-bottom: -.4rem; }
  .authority-grid, .key-grid { grid-template-columns: repeat(2, 1fr); }
  .progress { overflow-x: auto; }
  .progress span { min-width: 120px; }
  .story-step { grid-template-columns: minmax(280px, .8fr) 1.2fr; }
  .demo-scene { grid-template-columns: 1fr; }
  .demo-scene > figure { min-height: 260px; max-height: 340px; }
}

@media (max-width: 620px) {
  .masthead, main, footer { width: calc(100% - 28px); }
  .masthead { height: 64px; }
  main { padding: 56px 0 80px; }
  h1 { font-size: clamp(2.9rem, 15vw, 4.7rem); }
  .hero { padding-bottom: 72px; }
  .hero-copy > p:last-child { font-size: 1rem; }
  .story { margin-top: 38px; }
  .story-step { min-height: 0; grid-template-columns: 1fr; }
  .story-art, .story-step:nth-child(even) .story-art { order: 0; height: 220px; border-radius: 21px 21px 0 0; }
  .story-content { grid-template-columns: 34px 1fr auto; padding: 1rem; }
  .demo-workspace { padding-top: 58px; }
  .progress span { min-width: 105px; }
  .panel { border-radius: 18px; }
  .demo-scene > figure { min-height: 210px; max-height: 240px; }
  .demo-screen-body { padding: 1.2rem; }
  .screen-head, .section-head, .selection-row { align-items: flex-start; flex-direction: column; }
  .authority-grid, .key-grid, .share-grid, .secrets-grid { grid-template-columns: 1fr; }
  .chat-form { grid-template-columns: 1fr; }
  dl { grid-template-columns: 1fr; }
  footer { flex-direction: column; gap: .35rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}