/* ----- reset / globals ----- */
*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: light dark; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  background: #f5f5f7;
  color: #1c1c1e;
}
[v-cloak] { display: none; }
code, pre, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
a { color: #0a66c2; text-decoration: none; }
a:hover { text-decoration: underline; }

@media (prefers-color-scheme: dark) {
  body { background: #161618; color: #ececf1; }
  a { color: #6cb6ff; }
}

/* ----- layout ----- */
#app {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}
.page-header { margin-bottom: 24px; text-align: center; }
.language-toggle {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 18px;
}
.lang-btn {
  appearance: none;
  border: 1px solid #d4d4d8;
  background: transparent;
  color: #777;
  padding: 4px 12px;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
}
.lang-btn:first-child { border-radius: 8px 0 0 8px; }
.lang-btn:last-child {
  border-left: none;
  border-radius: 0 8px 8px 0;
}
.lang-btn:hover {
  background: #f0f0f2;
  color: #1c1c1e;
}
.lang-btn.active {
  background: #e8e8ec;
  color: #1c1c1e;
}
.lang-btn:focus-visible {
  outline: 2px solid #0a66c2;
  outline-offset: 1px;
}
.page-header h1 {
  font-size: 1.75rem;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.page-logo {
  display: block;
  width: 100%;
  height: auto;
  max-width: 520px;
  margin: 0 auto 16px;
  border-radius: 12px;
}
.tagline {
  margin: 0;
  color: #555;
  font-size: 0.95rem;
}
.tagline a { font-weight: 500; }
@media (prefers-color-scheme: dark) {
  .tagline { color: #aaa; }
  .lang-btn { background: transparent; border-color: #3a3a3e; color: #9a9aa1; }
  .lang-btn:hover { background: #2a2a2e; color: #ececf1; }
  .lang-btn.active { background: #34343a; color: #ececf1; }
}

/* ----- card ----- */
.card {
  background: #fff;
  border: 1px solid #e4e4e7;
  border-radius: 12px;
  padding: 20px 22px;
  margin-bottom: 12px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}
@media (prefers-color-scheme: dark) {
  .card {
    background: #1f1f23;
    border-color: #2c2c30;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  }
}

.hero {
  padding: 24px 22px;
  margin-bottom: 18px;
}

/* ----- collapsible cards (details elements) ----- */
.collapsible { padding: 0; }
.collapsible > summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 22px;
  font-size: 0.95rem;
  font-weight: 500;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  border-radius: 12px;
}
.collapsible > summary::-webkit-details-marker { display: none; }
.collapsible > summary::before {
  content: "›";
  display: inline-block;
  margin-right: 8px;
  font-size: 1.1rem;
  color: #888;
  transition: transform 0.15s ease;
}
.collapsible[open] > summary::before { transform: rotate(90deg); }
.collapsible[open] > summary { border-bottom: 1px solid #e4e4e7; border-radius: 12px 12px 0 0; }
.collapsible > summary:hover { background: #fafafb; }
.collapsible > *:not(summary) {
  padding: 18px 22px 20px;
}
.summary-count {
  background: #e5e5ea;
  color: #555;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 600;
}
@media (prefers-color-scheme: dark) {
  .collapsible[open] > summary { border-bottom-color: #2c2c30; }
  .collapsible > summary:hover { background: #18181b; }
  .summary-count { background: #2a2a2e; color: #d4d4d8; }
}

/* ----- form ----- */
.field { margin-bottom: 14px; }
.field:last-child { margin-bottom: 0; }
.field-large { margin-bottom: 16px; }
.field-large label { font-size: 0.9rem; }
.field-large select,
.field-large input { font-size: 1rem !important; padding: 11px 12px !important; }
.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: #333;
}
@media (prefers-color-scheme: dark) {
  .field label { color: #d4d4d8; }
}
.field input[type="text"],
.field input[type="number"],
.field select {
  width: 100%;
  padding: 8px 10px;
  font: inherit;
  font-size: 0.92rem;
  border: 1px solid #d4d4d8;
  border-radius: 8px;
  background: #fff;
  color: inherit;
}
.field input:focus,
.field select:focus {
  outline: 2px solid #0a66c2;
  outline-offset: 1px;
  border-color: transparent;
}
@media (prefers-color-scheme: dark) {
  .field input[type="text"],
  .field input[type="number"],
  .field select {
    background: #2a2a2e;
    border-color: #3a3a3e;
  }
}
.field .hint {
  margin: 4px 0 0;
  color: #666;
  font-size: 0.8rem;
}
@media (prefers-color-scheme: dark) {
  .field .hint { color: #9a9aa1; }
}
.field .inline-check {
  display: flex;
  gap: 8px;
  align-items: center;
  font-weight: 400;
  font-size: 0.9rem;
}
.field .inline-check code {
  background: #f0f0f2;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.85rem;
}
@media (prefers-color-scheme: dark) {
  .field .inline-check code { background: #2a2a2e; }
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px 18px;
}

/* ----- engine meta ----- */
.engine-meta { margin-top: 12px; }
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}
.badge {
  display: inline-block;
  font-size: 0.78rem;
  padding: 3px 9px;
  border-radius: 999px;
  background: #e5e5ea;
  color: #333;
  font-weight: 500;
}
.badge-ok    { background: #d4edda; color: #155724; }
.badge-warn  { background: #fff3cd; color: #856404; }
.badge-error { background: #f8d7da; color: #721c24; }
.badge-info  { background: #e0eaff; color: #1a3c7e; }
@media (prefers-color-scheme: dark) {
  .badge        { background: #2a2a2e; color: #d4d4d8; }
  .badge-ok     { background: #1f3a25; color: #87d195; }
  .badge-warn   { background: #3a3217; color: #e6c570; }
  .badge-error  { background: #3a1d20; color: #ea8a93; }
  .badge-info   { background: #1d2940; color: #8eb1f0; }
}

.callout {
  background: #fafafb;
  border: 1px solid #e4e4e7;
  border-radius: 8px;
  padding: 8px 12px;
  margin-bottom: 8px;
  font-size: 0.88rem;
}
.callout summary {
  cursor: pointer;
  font-weight: 600;
  color: #444;
}
.callout p, .callout ul { margin: 8px 0 0; }
.callout ul { padding-left: 20px; }
.callout a { word-break: break-word; }
.callout code {
  background: #f0f0f2;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.88em;
}
.engine-description { line-height: 1.6; }
.engine-status-line { font-size: 0.88rem; }
.engine-notes li { margin-bottom: 4px; line-height: 1.5; }
.license-missing {
  margin-top: 10px !important;
  padding: 8px 10px;
  background: #fff3cd;
  border: 1px solid #ffd966;
  border-radius: 6px;
  font-size: 0.82rem;
  color: #856404;
}
@media (prefers-color-scheme: dark) {
  .callout code { background: #2a2a2e; }
  .license-missing {
    background: #3a3217;
    border-color: #6b5817;
    color: #e6c570;
  }
}
@media (prefers-color-scheme: dark) {
  .callout { background: #18181b; border-color: #2c2c30; }
  .callout summary { color: #d4d4d8; }
}

/* ----- buttons ----- */
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}
.actions .btn-primary { flex: 1 1 auto; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 16px;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 500;
  border: 1px solid #d4d4d8;
  border-radius: 8px;
  background: #fff;
  color: inherit;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, transform 0.06s;
}
.btn:hover { background: #f0f0f2; }
.btn:active { transform: scale(0.98); }
.btn-large { padding: 13px 22px; font-size: 1rem; }
.btn-small { padding: 5px 10px; font-size: 0.82rem; }
.btn-primary {
  background: #0a66c2;
  border-color: #0a66c2;
  color: #fff;
}
.btn-primary:hover { background: #0958a8; }
.btn-primary.copied { background: #16a34a; border-color: #16a34a; }
.btn-colab {
  background: #f9ab00;
  border-color: #e69500;
  color: #202124;
  font-weight: 600;
}
.btn-colab:hover { background: #e69500; border-color: #cf8500; }
@media (prefers-color-scheme: dark) {
  .btn-colab { color: #202124; }
}
.btn-ghost { border-color: transparent; color: #666; }
.btn-ghost:hover { color: #1c1c1e; background: #f0f0f2; }
@media (prefers-color-scheme: dark) {
  .btn { background: #2a2a2e; border-color: #3a3a3e; }
  .btn:hover { background: #34343a; }
  .btn-ghost { color: #9a9aa1; }
  .btn-ghost:hover { color: #ececf1; background: #2a2a2e; }
}

/* ----- copy card ----- */
.copy-card { padding-top: 18px; }
.step-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  margin: 0 0 12px;
  font-weight: 600;
  letter-spacing: -0.005em;
}
.step-heading:not(:first-child) { margin-top: 22px; }
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  background: #0a66c2;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
}
.alt-heading {
  font-size: 1rem;
  margin: 0 0 4px;
  font-weight: 600;
  letter-spacing: -0.005em;
}
.alt-hint {
  margin: 0 0 12px;
  color: #666;
  font-size: 0.86rem;
}
@media (prefers-color-scheme: dark) {
  .alt-hint { color: #9a9aa1; }
}

.code-block {
  border: 1px solid #e4e4e7;
  border-radius: 8px;
  overflow: hidden;
  background: #fafafb;
}
.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 10px 8px 14px;
  background: #f0f0f2;
  border-bottom: 1px solid #e4e4e7;
}
.code-block-meta {
  font-size: 0.78rem;
  color: #666;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.cell-preview {
  margin: 0;
  padding: 12px 14px;
  max-height: 280px;
  overflow: auto;
  font-size: 0.78rem;
  line-height: 1.55;
  background: transparent;
}
.agent-prompt-preview { max-height: 360px; }
.btn-block { width: 100%; }
.cta-hint {
  margin: 8px 0 0;
  font-size: 0.8rem;
  color: #777;
  text-align: center;
}
.utility-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed #e4e4e7;
}
@media (prefers-color-scheme: dark) {
  .code-block { background: #18181b; border-color: #2c2c30; }
  .code-block-header { background: #1a1a1d; border-bottom-color: #2c2c30; }
  .code-block-meta { color: #9a9aa1; }
  .cta-hint { color: #888; }
  .utility-actions { border-top-color: #2c2c30; }
}

.loading {
  text-align: center;
  color: #888;
  padding: 40px 0;
}

.page-footer {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid #e4e4e7;
  font-size: 0.82rem;
  color: #777;
  text-align: center;
}
.page-footer .dot { color: #999; margin: 0 6px; }
@media (prefers-color-scheme: dark) {
  .page-footer { border-color: #2c2c30; color: #888; }
  .page-footer .dot { color: #666; }
}