/* Direction A: precision. Monochrome, technical cadence, quiet surfaces. */
body[data-concept="precision"] {
  --canvas: #ffffff;
  --surface: #ffffff;
  --surface-alt: #fafafa;
  --ink: #171717;
  --muted: #4d4d4d;
  --subtle: #888888;
  --line: #ebebeb;
  --accent: #171717;
  --accent-hover: #4d4d4d;
  --accent-ink: #ffffff;
  --accent-soft: #f5f5f5;
  --success: #0070f3;
  --danger: #c50000;
  --warning: #ab570a;
  --radius: 8px;
  --radius-sm: 6px;
  --shadow: 0 1px 1px #00000005, 0 2px 2px #0000000a;
  --font: Geist, Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 14px;
  letter-spacing: -.01em;
}

body[data-concept="precision"][data-theme="dark"] {
  --canvas: #212121;
  --surface: #262626;
  --surface-alt: #2b2b2b;
  --sidebar: #171717;
  --ink: #ededed;
  --muted: #b4b4b4;
  --subtle: #a1a1a1;
  --line: #3a3a3a;
  --control-line: #4a4a4a;
  --accent: #f1f1f1;
  --accent-hover: #ffffff;
  --accent-ink: #171717;
  --accent-soft: #333333;
  --success: #50e3c2;
  --danger: #ff4d4d;
  --warning: #f5a623;
  --shadow: 0 1px 1px #00000014, 0 2px 2px #00000014;
}

/* Dark-only surface hierarchy; the light palette and shared geometry stay intact. */
body[data-concept="precision"][data-theme="dark"] .sidebar {
  background: var(--sidebar);
}
body[data-concept="precision"][data-theme="dark"] :is(.model-picker select, .prompt-box, .parameter-field select, .parameter-field input, .system-input, .api-prompt) {
  border-color: var(--control-line);
}
body[data-concept="precision"][data-theme="dark"] :is(.hero-code, .code-panel) {
  background: var(--surface);
  border-color: var(--line);
}
body[data-concept="precision"][data-theme="dark"] :is(.hero-code, .code-panel) :is(.code-title, .code-key) {
  color: var(--muted);
  border-color: var(--line);
}

body[data-concept="precision"] .site-nav {
  min-height: 72px;
  background: var(--canvas);
  border-bottom: 1px solid var(--line);
  box-shadow: none;
}
body[data-concept="precision"] .wordmark,
body[data-concept="precision"] .sidebar-brand {
  font-weight: 600;
  letter-spacing: -.06em;
}
body[data-concept="precision"] .site-links {
  font-size: 14px;
  letter-spacing: -.02em;
}
body[data-concept="precision"] .site-actions button,
body[data-concept="precision"] .site-actions .button {
  border-radius: 6px;
}
body[data-concept="precision"] .home-page {
  max-width: 1280px;
  margin-inline: auto;
}
body[data-concept="precision"] .hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  align-items: center;
  gap: 64px;
  padding-block: 72px 64px;
  text-align: left;
}
body[data-concept="precision"] .hero-copy { max-width: 520px; }
body[data-concept="precision"] .eyebrow {
  color: var(--muted);
  font: 400 12px/16px var(--mono);
  letter-spacing: .02em;
}
body[data-concept="precision"] .hero h1 {
  max-width: 11em;
  margin-block: 24px;
  font-size: 48px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -2.4px;
  text-wrap: balance;
}
body[data-concept="precision"] .hero-description {
  max-width: 450px;
  color: var(--muted);
  font-size: 18px;
  line-height: 28px;
  letter-spacing: 0;
}
body[data-concept="precision"] .hero-actions { margin-top: 32px; gap: 12px; }
body[data-concept="precision"] .hero-actions a,
body[data-concept="precision"] .hero-actions button { border-radius: 100px; }
body[data-concept="precision"] .hero-visual {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow);
}
body[data-concept="precision"] .showcase-art {
  border-radius: 0;
  overflow: hidden;
}
body[data-concept="precision"] .hero-visual .showcase-art { aspect-ratio: 16 / 9; }
body[data-concept="precision"] .visual-caption {
  padding: 12px 16px;
  background: var(--surface);
  color: var(--muted);
  font: 400 12px/16px var(--mono);
}
body[data-concept="precision"] .hero-code {
  margin: 0;
  border: 0;
  border-radius: 0;
  background: #171717;
  color: #ffffff;
}
body[data-concept="precision"] .code-title {
  padding: 12px 20px;
  border-bottom: 1px solid #4d4d4d;
  color: #a1a1a1;
  font: 400 12px/16px var(--mono);
}
body[data-concept="precision"] .code-lines { padding: 16px 20px; font: 400 12px/20px var(--mono); }
/* These code surfaces stay dark in both themes; syntax must not inherit light-page ink. */
body[data-concept="precision"] :is(.hero-code, .code-panel) .code-lines { color: #ededed; }
body[data-concept="precision"] :is(.hero-code, .code-panel) .code-key,
body[data-concept="precision"] :is(.hero-code, .code-panel) .code-title { color: #a1a1a1; }
body[data-concept="precision"] :is(.hero-code, .code-panel) .code-string { color: #d3e5ff; }
body[data-concept="precision"] :is(.hero-code, .code-panel) :is(.text-link, .icon-button) { color: #ededed; }
body[data-concept="precision"] :is(.hero-code, .code-panel) :is(.text-link, .icon-button):hover { color: #ffffff; }
body[data-concept="precision"] .model-strip {
  background: transparent;
  border: 0;
  border-block: 1px solid var(--line);
  border-radius: 0;
  padding-block: 24px;
  box-shadow: none;
}
body[data-concept="precision"] .section-heading {
  margin-top: 48px;
  margin-bottom: 24px;
}
body[data-concept="precision"] .section-heading h2 { font-size: 24px; font-weight: 600; letter-spacing: -.96px; }
body[data-concept="precision"] .product-grid { gap: 0; }
body[data-concept="precision"] .product-card {
  padding: 24px 32px 24px 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}
body[data-concept="precision"] .product-card + .product-card { padding-left: 32px; border-left: 1px solid var(--line); }
body[data-concept="precision"] .product-number { font: 400 12px/16px var(--mono); color: var(--subtle); }
body[data-concept="precision"] .product-card h3 { font-weight: 600; letter-spacing: -.6px; }
body[data-concept="precision"] .home-footer { margin-top: 48px; border-top: 1px solid var(--line); }

body[data-concept="precision"] .app-shell { background: var(--canvas); }
body[data-concept="precision"] .sidebar {
  background: var(--surface-alt);
  border-right: 1px solid var(--line);
}
body[data-concept="precision"] .workspace-switch {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow);
}
body[data-concept="precision"] .nav-section { margin-top: 28px; }
body[data-concept="precision"] .nav-label {
  font: 400 11px/16px var(--mono);
  letter-spacing: .025em;
  color: var(--subtle);
}
body[data-concept="precision"] .nav-item {
  position: relative;
  min-height: 40px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 400;
}
body[data-concept="precision"] .nav-item.active {
  background: var(--accent-soft);
  color: var(--ink);
  font-weight: 500;
}
body[data-concept="precision"] .nav-item.active::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: -12px;
  width: 2px;
  border-radius: 2px;
  background: var(--ink);
}
body[data-concept="precision"] .balance-mini { border-radius: 6px; background: var(--surface); box-shadow: none; }
body[data-concept="precision"] .balance-mini strong { font-family: var(--mono); font-weight: 500; }
body[data-concept="precision"] .account-mini { border-top: 1px solid var(--line); }
body[data-concept="precision"] .app-topbar { background: var(--canvas); border-bottom: 1px solid var(--line); }
body[data-concept="precision"] .page-heading { margin-bottom: 32px; }
body[data-concept="precision"] .page-title { font-size: 24px; line-height: 32px; font-weight: 600; letter-spacing: -.96px; }
body[data-concept="precision"] .page-subtitle { color: var(--muted); font-size: 14px; line-height: 20px; }
body[data-concept="precision"] .studio-layout { gap: 32px; grid-template-columns: minmax(320px, .95fr) minmax(0, 1.25fr); }
body[data-concept="precision"] .composer {
  padding: 0 32px 0 0;
  border: 0;
  border-right: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}
body[data-concept="precision"] .panel-title { font-weight: 600; font-size: 14px; line-height: 20px; letter-spacing: -.28px; }
body[data-concept="precision"] .field-label { font-size: 12px; font-weight: 500; }
body[data-concept="precision"] .model-picker select,
body[data-concept="precision"] .prompt-input,
body[data-concept="precision"] .parameter-field,
body[data-concept="precision"] .api-prompt {
  background: var(--surface);
  border-color: var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow);
}
body[data-concept="precision"] .model-picker { min-height: 48px; }
/* Paint only the select; the wrapper preserves spacing without a second surface. */
body[data-concept="precision"] .model-picker select { display: block; }
body[data-concept="precision"] .model-note { color: var(--subtle); font-size: 11px; line-height: 16px; }
body[data-concept="precision"] .prompt-input { font-size: 14px; line-height: 22px; }
body[data-concept="precision"] .prompt-tools { font-size: 12px; }
body[data-concept="precision"] .parameter-grid { gap: 12px; }
body[data-concept="precision"] .advanced-details { border-color: var(--line); }
body[data-concept="precision"] .estimate-line { font-size: 12px; }
body[data-concept="precision"] .generate-button { border-radius: 6px; min-height: 44px; font-weight: 500; box-shadow: none; }
body[data-concept="precision"] .output-panel {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}
body[data-concept="precision"] .output-heading { margin-bottom: 16px; }
body[data-concept="precision"] .output-preview { border-radius: 8px; border: 1px solid var(--line); background: var(--surface-alt); }
body[data-concept="precision"] .output-preview .showcase-art { border-radius: 7px; }
body[data-concept="precision"] .output-empty { background: var(--surface-alt); }
body[data-concept="precision"] .output-meta { font: 400 12px/16px var(--mono); }
body[data-concept="precision"] .result-actions { padding-top: 16px; }
body[data-concept="precision"] .recent-section { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line); }
body[data-concept="precision"] .recent-grid { gap: 16px; }
body[data-concept="precision"] .recent-card { border-radius: 6px; box-shadow: none; }
body[data-concept="precision"] .playground-layout { gap: 32px; }
body[data-concept="precision"] .request-panel {
  border: 0;
  border-radius: 0;
  padding: 0 32px 0 0;
  border-right: 1px solid var(--line);
  box-shadow: none;
  background: transparent;
}
body[data-concept="precision"] .response-panel {
  border: 0;
  border-radius: 0;
  padding: 0;
  box-shadow: none;
  background: transparent;
}
body[data-concept="precision"] .request-tabs { border-bottom: 1px solid var(--line); border-radius: 0; background: transparent; }
body[data-concept="precision"] .api-prompt { font-family: var(--font); }
body[data-concept="precision"] .code-panel { border-radius: 8px; background: #171717; color: #ededed; border: 1px solid #292929; }
body[data-concept="precision"] .response-empty { background: var(--surface-alt); border-radius: 8px; border: 1px solid var(--line); }
body[data-concept="precision"] .request-meta { font: 400 12px/20px var(--mono); }
body[data-concept="precision"] .api-settings { border-color: var(--line); background: var(--surface-alt); border-radius: 6px; }
body[data-concept="precision"] :is(button, a) { transition: background-color 160ms ease-out, color 160ms ease-out, border-color 160ms ease-out; }
body[data-concept="precision"] :is(.nav-item, .site-links a):hover { color: var(--ink); background: var(--accent-soft); }
body[data-concept="precision"] :lang(zh) h1,
body[data-concept="precision"] :lang(zh-CN) h1,
body[data-concept="precision"] :lang(zh-TW) h1 { letter-spacing: -1.2px; }

@media (max-width: 1100px) {
  body[data-concept="precision"] .hero { gap: 40px; }
  body[data-concept="precision"] .studio-layout { grid-template-columns: minmax(280px, 1fr) minmax(0, 1.1fr); gap: 24px; }
  body[data-concept="precision"] .composer,
  body[data-concept="precision"] .request-panel { padding-right: 24px; }
}
@media (max-width: 900px) {
  body[data-concept="precision"] .hero { grid-template-columns: 1fr; gap: 40px; padding-block: 48px; }
  body[data-concept="precision"] .hero-copy { max-width: 620px; }
  body[data-concept="precision"] .hero-visual { max-width: 640px; width: 100%; }
  body[data-concept="precision"] .studio-layout,
  body[data-concept="precision"] .playground-layout { grid-template-columns: 1fr; }
  body[data-concept="precision"] .composer,
  body[data-concept="precision"] .request-panel { padding: 0 0 24px; border-right: 0; border-bottom: 1px solid var(--line); }
}
@media (max-width: 600px) {
  body[data-concept="precision"] .site-nav { min-height: 64px; }
  body[data-concept="precision"] .hero { padding-block: 40px; gap: 32px; }
  body[data-concept="precision"] .hero h1 { font-size: 40px; line-height: 42px; letter-spacing: -2px; }
  body[data-concept="precision"] .hero-description { font-size: 16px; line-height: 24px; }
  body[data-concept="precision"] .hero-actions { margin-top: 24px; }
  body[data-concept="precision"] .hero-visual { border-radius: 8px; }
  body[data-concept="precision"] .code-lines { padding: 16px; font-size: 11px; line-height: 18px; }
  body[data-concept="precision"] .product-card { padding: 24px 0; }
  body[data-concept="precision"] .product-card + .product-card { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  body[data-concept="precision"] .page-heading { margin-bottom: 24px; }
  body[data-concept="precision"] .nav-item { min-height: 44px; }
  body[data-concept="precision"] .model-strip { padding-block: 20px; }
}
@media (prefers-reduced-motion: reduce) {
  body[data-concept="precision"] :is(button, a) { transition: none; }
}