:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface-2: #f8f9fc;
  --text: #1b2430;
  --muted: #687386;
  --border: #dfe4ec;
  --primary: #2458d8;
  --primary-hover: #1848c2;
  --focus: #8ab4ff;
  --shadow: 0 14px 40px rgba(27, 36, 48, .08);
  --radius: 18px;
  --good: #18794e;
}
* { box-sizing: border-box; }
html { color-scheme: light; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.45;
}
button, input, select { font: inherit; }
button { cursor: pointer; }
a { color: var(--primary); }
.shell { width: min(1480px, calc(100% - 32px)); margin-inline: auto; }
.site-header { padding: 30px 0 18px; }
.header-inner { display: flex; justify-content: space-between; gap: 24px; align-items: flex-end; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 8px; font-size: clamp(32px, 4vw, 54px); line-height: 1.05; letter-spacing: -.035em; }
h2 { margin-bottom: 0; font-size: 22px; letter-spacing: -.015em; }
h3 { margin-bottom: 6px; font-size: 17px; }
.eyebrow { margin-bottom: 6px; color: var(--primary); font-size: 12px; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
.lead { max-width: 780px; margin-bottom: 0; color: var(--muted); font-size: 17px; }
.header-badge { flex: 0 0 auto; padding: 10px 14px; border: 1px solid var(--border); border-radius: 999px; background: var(--surface); color: var(--muted); font-size: 13px; }
.app-shell { padding-bottom: 56px; }

.task-panel, .presets-panel, .controls-card, .preview-card, .info-strip, .seo-copy, .calibration-card {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.task-panel, .presets-panel, .seo-copy, .calibration-card { padding: 22px; border-radius: var(--radius); }
.presets-panel { margin-top: 18px; }
.section-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; margin-bottom: 16px; }
.section-head.compact { margin-bottom: 18px; }
.link-button { border: 0; background: transparent; color: var(--primary); font-weight: 700; padding: 7px 0; }
.section-note { margin: 6px 0 0; color: var(--muted); font-size: 13px; }

.task-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; }
.task-card {
  min-height: 92px; text-align: left; padding: 14px; border: 1px solid var(--border);
  border-radius: 14px; background: var(--surface-2); color: var(--text); transition: .16s ease;
}
.task-card:hover { border-color: #b7c4dd; transform: translateY(-1px); }
.task-card.is-active { border-color: var(--primary); background: #eef3ff; box-shadow: inset 0 0 0 1px var(--primary); }
.task-card strong, .task-card span { display: block; }
.task-card strong { font-size: 14px; margin-bottom: 5px; }
.task-card span { color: var(--muted); font-size: 12px; }

.preset-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.preset-card { min-height: 78px; text-align: left; padding: 13px 14px; border: 1px solid var(--border); border-radius: 14px; background: var(--surface-2); color: var(--text); transition: .16s ease; }
.preset-card:hover { border-color: #b7c4dd; transform: translateY(-1px); }
.preset-card.is-active { border-color: var(--primary); background: #eef3ff; box-shadow: inset 0 0 0 1px var(--primary); }
.preset-card strong, .preset-card span { display: block; }
.preset-card strong { font-size: 14px; margin-bottom: 4px; }
.preset-card span { color: var(--muted); font-size: 12px; }

.workbench { display: grid; grid-template-columns: minmax(300px, 390px) minmax(0, 1fr); gap: 18px; margin-top: 18px; align-items: start; }
.controls-card, .preview-card { border-radius: var(--radius); }
.controls-card { padding: 22px; position: sticky; top: 14px; }
.preview-card { min-height: 720px; overflow: hidden; }
.control-group { padding: 14px 0; border-top: 1px solid var(--border); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
label { display: grid; gap: 6px; color: #3b4655; font-size: 12px; font-weight: 700; }
input[type="number"], select { min-width: 0; width: 100%; height: 42px; border: 1px solid #cfd6e2; border-radius: 10px; background: #fff; padding: 0 10px; color: var(--text); }
input:focus, select:focus, button:focus-visible, summary:focus-visible { outline: 3px solid #8ab4ff; outline: 3px solid color-mix(in srgb, var(--focus) 55%, transparent); outline-offset: 2px; }
.color-input { width: 100%; height: 42px; padding: 4px; border: 1px solid #cfd6e2; border-radius: 10px; background: #fff; }
.field-box { margin: 0; padding: 14px 0; border: 0; border-top: 1px solid var(--border); }
.field-box legend { padding: 0; margin-bottom: 9px; font-size: 12px; font-weight: 800; color: #3b4655; }
.switch-row { display: flex; gap: 9px; align-items: center; font-size: 13px; }
.switch-row input { width: 18px; height: 18px; accent-color: var(--primary); }
.field-options { grid-template-columns: 1fr 1fr 1fr; gap: 8px; padding-top: 12px; }
.field-options:not([hidden]) { display: grid; }
.advanced-box { border-top: 1px solid var(--border); padding: 14px 0; }
.advanced-box summary { color: var(--primary); font-size: 13px; font-weight: 800; cursor: pointer; }
.advanced-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; padding-top: 12px; }
.actions { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; margin-top: 16px; }
.primary-btn, .secondary-btn { min-height: 44px; border-radius: 11px; padding: 10px 12px; font-weight: 800; }
.primary-btn { grid-column: 1 / -1; border: 1px solid var(--primary); background: var(--primary); color: #fff; }
.primary-btn:hover { background: var(--primary-hover); }
.secondary-btn { border: 1px solid #cbd4e2; background: #fff; color: var(--text); }
.secondary-btn:hover { background: var(--surface-2); }
.share-btn { grid-column: 1 / -1; }
.print-note { margin: 13px 0 0; color: var(--muted); font-size: 11px; }
.status-text { min-height: 18px; margin: 8px 0 0; color: var(--good); font-size: 12px; font-weight: 700; }

.preview-toolbar { display: flex; justify-content: space-between; gap: 18px; align-items: flex-end; padding: 20px 22px 16px; border-bottom: 1px solid var(--border); }
.preview-meta { display: grid; gap: 2px; text-align: right; }
.preview-meta strong { font-size: 13px; }
.preview-meta span { color: var(--muted); font-size: 12px; }
.paper-stage { min-height: 650px; display: grid; place-items: center; padding: 28px; background: #e8ebf1; overflow: auto; }
.paper-preview { width: min(100%, 640px); line-height: 0; box-shadow: 0 16px 40px rgba(35, 44, 60, .20); background: #fff; }
.paper-preview svg { display: block; width: 100%; height: auto; background: #fff; }
.result-note { padding: 14px 22px 18px; border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; }
.result-note strong { color: var(--text); }

.info-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 18px; border-radius: var(--radius); overflow: hidden; }
.info-strip article { display: grid; gap: 4px; padding: 18px 20px; background: var(--surface); }
.info-strip strong { font-size: 13px; }
.info-strip span { color: var(--muted); font-size: 12px; }

.calibration-card { margin-top: 18px; }
.calibration-grid { display: grid; grid-template-columns: 1fr auto; gap: 18px; align-items: center; }
.calibration-card p { margin: 8px 0 0; color: var(--muted); font-size: 13px; }
.seo-copy { margin-top: 18px; }
.seo-copy p { color: var(--muted); max-width: 960px; }
.seo-copy ul { margin: 0; padding-left: 20px; color: var(--muted); }
.noscript { margin: 18px; padding: 14px; background: #fff3cd; border: 1px solid #f1d58a; border-radius: 10px; }

@media (max-width: 1150px) {
  .task-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 1050px) {
  .preset-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .workbench { grid-template-columns: 1fr; }
  .controls-card { position: static; }
  .preview-card { min-height: 0; }
}
@media (max-width: 720px) {
  .shell { width: min(100% - 20px, 1480px); }
  .site-header { padding-top: 22px; }
  .header-inner { align-items: flex-start; flex-direction: column; }
  .task-grid, .preset-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .two-col, .advanced-grid { grid-template-columns: 1fr; }
  .field-options:not([hidden]) { grid-template-columns: 1fr; }
  .paper-stage { padding: 16px; min-height: 520px; }
  .preview-toolbar { align-items: flex-start; flex-direction: column; }
  .preview-meta { text-align: left; }
  .info-strip { grid-template-columns: 1fr 1fr; }
  .calibration-grid { grid-template-columns: 1fr; }
}
@media (max-width: 430px) {
  .task-grid, .preset-grid, .info-strip { grid-template-columns: 1fr; }
}


/* SEO / AEO content hubs */
.seo-copy { padding: clamp(22px, 3vw, 36px); }
.seo-copy > .answer-card:first-child { margin-top: 0; }
.answer-card {
  margin: 0 0 28px; padding: 18px 20px; border: 1px solid #cbd8f7;
  border-radius: 14px; background: #f3f7ff; color: #2e3a4d; font-size: 15px;
}
.answer-card strong { color: #153d9f; }
.content-section { padding: 26px 0; border-top: 1px solid var(--border); }
.content-section:first-of-type { border-top: 0; padding-top: 4px; }
.content-section h2 { margin-bottom: 12px; font-size: clamp(22px, 2.6vw, 30px); }
.content-section p { max-width: 1000px; margin-bottom: 14px; color: #4f5b6c; font-size: 15px; }
.content-section p:last-child { margin-bottom: 0; }
.content-note { padding: 13px 15px; border-left: 3px solid var(--primary); background: var(--surface-2); border-radius: 0 10px 10px 0; }
.table-wrap { overflow-x: auto; margin: 16px 0 18px; border: 1px solid var(--border); border-radius: 12px; }
.content-table { width: 100%; border-collapse: collapse; min-width: 640px; background: #fff; }
.content-table th, .content-table td { padding: 12px 14px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; font-size: 13px; }
.content-table th { background: var(--surface-2); color: #374254; font-weight: 800; }
.content-table tr:last-child td { border-bottom: 0; }
.faq-list { display: grid; gap: 8px; max-width: 1000px; }
.faq-item { border: 1px solid var(--border); border-radius: 12px; background: #fff; padding: 0 14px; }
.faq-item summary { padding: 14px 2px; cursor: pointer; font-weight: 800; color: #344054; }
.faq-item p { padding: 0 2px 14px; margin: 0; }
.related-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.related-card { display: grid; gap: 5px; min-height: 86px; padding: 14px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface-2); color: inherit; text-decoration: none; }
.related-card:hover { border-color: #b7c4dd; transform: translateY(-1px); }
.related-card strong { color: var(--primary); font-size: 14px; }
.related-card span { color: var(--muted); font-size: 12px; }
@media (max-width: 760px) { .related-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 460px) { .related-grid { grid-template-columns: 1fr; } }


/* One-page semantic/AEO hub layer */
.hub-nav {
  margin-top: 18px; padding: 18px 20px; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow);
}
.hub-nav h2 { margin-bottom: 10px; font-size: 18px; }
.hub-links { display: flex; flex-wrap: wrap; gap: 8px; }
.hub-links a {
  display: inline-flex; align-items: center; min-height: 34px; padding: 7px 10px;
  border: 1px solid var(--border); border-radius: 999px; background: var(--surface-2);
  color: #3d4a5d; text-decoration: none; font-size: 12px; font-weight: 750;
}
.hub-links a:hover { border-color: #b7c4dd; color: var(--primary); background: #f2f6ff; }

.content-hubs { margin-top: 18px; display: grid; gap: 14px; }
.hub-section {
  scroll-margin-top: 16px; padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); box-shadow: var(--shadow);
}
.hub-section h2 { margin-bottom: 10px; font-size: clamp(24px, 2.8vw, 34px); }
.hub-section h3 { margin: 20px 0 8px; font-size: 18px; }
.hub-section p { max-width: 1040px; color: #4f5b6c; }
.quick-answer {
  max-width: 1040px; margin: 0 0 18px; padding: 14px 16px;
  border-left: 3px solid var(--primary); border-radius: 0 12px 12px 0;
  background: #f3f7ff; color: #344054;
}
.quick-answer strong { color: #153d9f; }
.hub-columns { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(260px, .85fr); gap: 24px; align-items: start; }
.fact-card {
  padding: 16px; border: 1px solid var(--border); border-radius: 14px; background: var(--surface-2);
}
.fact-card h3 { margin-top: 0; }
.fact-card ul { margin: 8px 0 0; padding-left: 20px; color: var(--muted); }
.fact-card li + li { margin-top: 6px; }
.hub-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.hub-action {
  min-height: 40px; padding: 9px 12px; border: 1px solid #cbd4e2; border-radius: 10px;
  background: #fff; color: var(--text); font-weight: 800;
}
.hub-action.primary { border-color: var(--primary); background: var(--primary); color: #fff; }
.hub-action:hover { transform: translateY(-1px); }
.option-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 9px; margin-top: 16px; }
.option-card { padding: 13px 14px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface-2); }
.option-card strong, .option-card span { display: block; }
.option-card strong { margin-bottom: 4px; color: #344054; font-size: 13px; }
.option-card span { color: var(--muted); font-size: 12px; }
.inline-note { margin-top: 14px; padding: 13px 15px; border-radius: 12px; background: #fbfbfd; border: 1px solid var(--border); color: var(--muted); font-size: 13px; }
.crosslinks { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.crosslinks a { color: var(--primary); font-size: 13px; font-weight: 750; text-decoration: none; }
.crosslinks a::after { content: " →"; }
.site-faq { margin-top: 18px; padding: clamp(22px, 3vw, 34px); border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.site-faq h2 { font-size: clamp(24px, 2.8vw, 34px); }
.site-footer { padding: 10px 0 48px; color: var(--muted); font-size: 12px; }
.site-footer p { margin: 0; }
@media (max-width: 900px) {
  .hub-columns { grid-template-columns: 1fr; }
  .option-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .option-grid { grid-template-columns: 1fr; }
  .hub-action { width: 100%; }
}

.frame-options { grid-template-columns: 1fr 1fr; gap: 8px; padding-top: 12px; }
.frame-options:not([hidden]) { display: grid; }
@media (max-width: 720px) { .frame-options:not([hidden]) { grid-template-columns: 1fr; } }