:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #22271f;
  background: #f7f8f2;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  --ink: #22271f;
  --muted: #66715f;
  --border: #e1e6db;
  --accent: #4c831f;
  --accent-dark: #315e18;
  --surface: rgba(255,255,255,.82);
  --soft-green: #f0f5e9;
}
* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: radial-gradient(ellipse at 84% 5%, #edf4d9 0, transparent 32rem), #f7f8f2; }
a { color: #3f781c; }
button, textarea { font: inherit; }
h1, h2, h3, h4, p { margin-top: 0; }
html[lang="en"] [data-locale="zh"], html[lang="zh"] [data-locale="en"] { display: none !important; }

.topbar { display: flex; align-items: center; justify-content: space-between; width: min(1160px, calc(100% - 48px)); min-height: 68px; margin: 0 auto; border-bottom: 1px solid #e4e8dc; }
.wordmark { color: #263320; font-size: 14px; font-weight: 750; text-decoration: none; }
.topbar-actions { display: flex; align-items: center; gap: 18px; }
.topbar-label { color: #77816f; font-size: 13px; }
.language-toggle, .button, .state-button { border: 1px solid #d7e0cf; border-radius: 7px; background: #fff; color: #36512a; font-weight: 650; cursor: pointer; }
.language-toggle { padding: 8px 12px; font-size: 13px; }
.language-toggle:hover, .state-button:hover, .button-secondary:hover { border-color: #8aa872; }
button:focus-visible, a:focus-visible, summary:focus-visible, textarea:focus-visible { outline: 3px solid #74a34c; outline-offset: 3px; }
main { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }
.section-nav { display: flex; flex-wrap: wrap; gap: 8px; padding: 18px 0 0; }
.section-nav a { padding: 7px 10px; border: 1px solid #e0e7d9; border-radius: 6px; background: rgba(255,255,255,.62); color: #536348; font-size: 12px; text-decoration: none; }
.section-nav a:hover { border-color: #a8bd91; color: var(--accent-dark); }

.intro { display: grid; grid-template-columns: minmax(280px, .83fr) minmax(0, 1.17fr); align-items: start; gap: clamp(28px, 5vw, 64px); padding: 50px 0 76px; }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: 11px; font-weight: 750; letter-spacing: .13em; }
h1 { margin-bottom: 18px; font-size: clamp(38px, 5vw, 60px); letter-spacing: -.06em; line-height: 1.03; }
.lead { max-width: 500px; margin-bottom: 22px; color: #596451; font-size: 16px; line-height: 1.7; }
.platforms { display: flex; flex-wrap: wrap; gap: 8px; }
.platforms span { padding: 7px 10px; border: 1px solid #dce5d3; border-radius: 6px; background: rgba(255,255,255,.65); color: #536348; font-size: 11px; font-weight: 650; }

.preview-card { padding: 22px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); }
.preview-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.preview-heading .eyebrow { margin-bottom: 6px; }
.preview-heading h2 { margin: 0; font-size: 22px; letter-spacing: -.035em; }
.demo-badge { flex: none; padding: 6px 8px; border: 1px solid #e0e6d7; border-radius: 5px; background: #f3f6ec; color: #526842; font-size: 11px; font-weight: 700; }
.preview-layout { display: grid; grid-template-columns: minmax(200px, .72fr) minmax(0, 1.28fr); gap: 16px; }
.pet-preview { display: flex; flex-direction: column; }
.pet-stage { position: relative; display: grid; min-height: 254px; place-items: center; overflow: hidden; border: 1px solid #e2e7dd; border-radius: 8px; background-color: #fff; background-image: linear-gradient(45deg, #edf0e9 25%, transparent 25%), linear-gradient(-45deg, #edf0e9 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #edf0e9 75%), linear-gradient(-45deg, transparent 75%, #edf0e9 75%); background-position: 0 0, 0 8px, 8px -8px, -8px 0; background-size: 16px 16px; }
.pet-sprite { width: 192px; height: 208px; background-image: url("./pets/uu-usagi/spritesheet.webp"); background-repeat: no-repeat; background-size: 800% 900%; }
.state-indicator { position: absolute; top: 12px; left: 12px; padding: 6px 8px; border: 1px solid #e0e6d7; border-radius: 5px; background: rgba(255,255,255,.92); color: #4d6540; font-size: 11px; font-weight: 700; }
.speech-bubble { position: absolute; right: 22px; bottom: 34px; display: grid; width: 32px; height: 32px; place-items: center; border: 1px solid #dfe6d8; border-radius: 50%; background: #fff; color: #537b35; font-weight: 800; }
.preview-status { min-height: 2.8em; margin: 9px 0 0; color: var(--muted); font-size: 12px; line-height: 1.45; }
.conversation { display: flex; min-width: 0; flex-direction: column; padding: 15px; border: 1px solid #e5e9e0; border-radius: 8px; background: #fff; }
.conversation-heading h3 { margin-bottom: 10px; font-size: 15px; }
.demo-disclaimer { margin-bottom: 12px; padding: 9px 10px; border-left: 2px solid #91ad75; background: #f4f7ef; color: #5e6b56; font-size: 11px; line-height: 1.5; }
.chat-log { display: flex; flex: 1; flex-direction: column; align-items: flex-start; gap: 9px; }
.chat-message { max-width: 95%; margin: 0; padding: 9px 11px; border-radius: 8px; font-size: 12px; line-height: 1.55; }
.user-message { align-self: flex-end; background: #eaf4e2; color: #314629; }
.assistant-message { background: #f2f3ef; color: #515b4c; }
.demo-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.button { padding: 9px 12px; font-size: 12px; }
.button-primary { border-color: #4e822c; background: #4e822c; color: #fff; }
.button-primary:hover { border-color: #3f6b22; background: #3f6b22; }
.button-secondary { border-color: #d7e0cf; background: #fff; color: #36512a; }
.state-control-wrap { margin-top: 17px; }
.state-control-label { margin-bottom: 8px; color: #5e6958; font-size: 11px; font-weight: 700; }
.state-controls { display: flex; flex-wrap: wrap; gap: 7px; }
.state-button { padding: 7px 9px; font-size: 11px; }
.state-button[aria-pressed="true"] { border-color: #587f38; background: #eaf3e2; color: #2f5519; }
.motion-note { margin: 12px 0 0; color: #75806f; font-size: 11px; line-height: 1.5; }

.content-section { padding: 0 0 72px; scroll-margin-top: 18px; }
.section-heading { max-width: 700px; margin-bottom: 25px; }
.section-heading .eyebrow { margin-bottom: 8px; }
.section-heading h2 { margin-bottom: 8px; font-size: clamp(26px, 3.5vw, 36px); letter-spacing: -.045em; line-height: 1.15; }
.section-heading > p:last-child { margin-bottom: 0; color: #687361; font-size: 14px; line-height: 1.65; }
.use-case-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.use-case, .selection-card { min-width: 0; padding: 20px; border: 1px solid var(--border); border-radius: 9px; background: var(--surface); }
.use-case-heading { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 14px; }
.step-number { display: grid; width: 30px; height: 30px; flex: none; place-items: center; border-radius: 50%; background: #eaf3e2; color: #4a762a; font-size: 11px; font-weight: 750; }
.use-case-heading .eyebrow { margin: 1px 0 5px; font-size: 10px; }
.use-case h3, .selection-card h3, .prompt-card h3, .notice h3, .uninstall-card h3 { margin-bottom: 8px; font-size: 17px; letter-spacing: -.02em; }
.use-case > p, .selection-card > p, .prompt-card p, .notice p, .uninstall-card > p { color: #606b5a; font-size: 13px; line-height: 1.65; }
.use-case > p { margin-bottom: 13px; }
.use-case h4, .uninstall-card h4 { margin: 13px 0 7px; color: #55624e; font-size: 11px; font-weight: 700; }
pre { overflow-x: auto; margin: 0 0 10px; padding: 11px 12px; border: 1px solid #e3e8df; border-radius: 6px; background: #f4f6f0; color: #273322; font: 11px/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; white-space: pre-wrap; overflow-wrap: anywhere; }
.card-note { margin: 12px 0 0 !important; color: #71806b !important; font-size: 11px !important; }
.download-link { display: inline-flex; align-items: center; gap: 7px; margin: 2px 0 12px; padding: 9px 11px; border: 1px solid #cdddc1; border-radius: 6px; background: #f7faf3; font-size: 12px; font-weight: 700; text-decoration: none; }
.download-link:hover { background: #edf5e6; }
.compact-steps { display: grid; gap: 8px; margin: 12px 0 0; padding-left: 20px; color: #46513f; font-size: 12px; line-height: 1.6; }
.compact-steps li { padding-left: 2px; }

.prompt-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 10px 24px; margin-top: 18px; padding: 22px; border: 1px solid #dfe7d6; border-radius: 9px; background: #f5f8f0; }
.prompt-card .eyebrow { margin-bottom: 7px; }
.prompt-card h3 { margin-bottom: 7px; font-size: 19px; }
.prompt-card p { max-width: 700px; margin-bottom: 0; }
.copy-button { min-width: 160px; }
.copy-status { grid-column: 1 / -1; min-height: 1em; margin: 0; color: #49643b !important; font-size: 12px !important; }
.prompt-fallback { grid-column: 1 / -1; padding-top: 3px; }
.prompt-fallback summary { width: fit-content; color: #416c26; font-size: 12px; font-weight: 700; cursor: pointer; }
.prompt-fallback label { display: block; margin: 12px 0 6px; color: #596451; font-size: 11px; font-weight: 700; }
.prompt-fallback textarea { display: block; width: 100%; resize: vertical; padding: 12px; border: 1px solid #dce4d5; border-radius: 6px; background: #fff; color: #35402f; font: 11px/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.choose-section { padding-top: 4px; border-top: 1px solid #e4e8dc; }
.selection-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.selection-card h3 { min-height: 2.4em; }
.selection-card > p { margin-bottom: 8px; }
.source-link { margin: 18px 0 0; color: #697463; font-size: 12px; }
.source-link a, .page-footer a { color: #487b25; text-underline-offset: 3px; }
.materials-section { padding-top: 4px; border-top: 1px solid #e4e8dc; }
.materials-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 14px; }
.notice, .uninstall-card { min-width: 0; padding: 20px; border: 1px solid #e0e6d7; border-radius: 9px; background: var(--surface); }
.notice { display: grid; grid-template-columns: 30px 1fr; gap: 12px; border-left: 3px solid #8eaa62; }
.notice-mark { display: grid; width: 26px; height: 26px; place-items: center; border: 1px solid #cbd8b8; border-radius: 50%; color: #587d30; font-family: Georgia, serif; font-weight: 700; }
.notice h3 { margin-bottom: 8px; }
.notice p { margin-bottom: 8px; }
.notice p:last-child { margin-bottom: 0; }
.uninstall-card > p { margin-bottom: 10px; }
.page-footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding: 24px 0 36px; border-top: 1px solid #e4e8dc; color: #7b8575; font-size: 11px; }
[hidden] { display: none !important; }

@media (max-width: 900px) {
  .intro { grid-template-columns: 1fr; gap: 26px; padding-top: 42px; }
  .intro-copy { max-width: 720px; }
  .preview-layout { grid-template-columns: minmax(190px, .72fr) minmax(0, 1.28fr); }
  .selection-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .topbar, main { width: calc(100% - 32px); }
  .topbar-actions { gap: 10px; }
  .topbar-label { display: none; }
  .section-nav { gap: 6px; }
  .section-nav a { font-size: 11px; }
  .intro { padding: 34px 0 54px; }
  h1 { font-size: clamp(36px, 10vw, 52px); }
  .preview-card { padding: 15px; }
  .preview-layout { grid-template-columns: 1fr; }
  .pet-stage { min-height: 236px; }
  .use-case-grid, .selection-grid, .materials-grid { grid-template-columns: 1fr; }
  .prompt-card { grid-template-columns: 1fr; gap: 14px; padding: 18px; }
  .copy-button { width: 100%; }
  .content-section { padding-bottom: 54px; }
  .selection-card h3 { min-height: 0; }
  .page-footer { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}