:root {
  --ink: #171717;
  --muted: #626262;
  --line: #dedede;
  --wash: #f5f5f5;
  --mono: Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
body { margin: 0; background: #fff; color: var(--ink); font: 15px/1.6 Arial, Helvetica, sans-serif; }
body:has(dialog[open]) { overflow: hidden; }
a { color: inherit; text-underline-offset: 4px; }
button, input, select, textarea { font: inherit; }
button, .button {
  display: inline-flex; align-items: center; justify-content: center; gap: 12px;
  min-height: 46px; padding: 12px 20px; border: 1px solid var(--ink);
  border-radius: 0; color: #fff; background: var(--ink); font-size: 14px;
  line-height: 1.4; text-decoration: none; cursor: pointer;
}
button:hover, .button:hover { background: #363636; }
button:disabled { opacity: .45; cursor: not-allowed; }
.outline, .text-button { color: var(--ink); background: #fff; }
.outline:hover, .text-button:hover { background: var(--wash); }
.text-button { border: 0; text-decoration: underline; }
:is(button, a, input, select, textarea, summary, [tabindex]):focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; }
[hidden] { display: none !important; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-weight: 500; line-height: 1.2; letter-spacing: -.035em; }
h1 { margin-bottom: 26px; font-size: clamp(30px, 3vw, 44px); }
h2 { font-size: 25px; }
h3 { font-size: 20px; }
img { display: block; max-width: 100%; object-fit: contain; }
fieldset { min-width: 0; margin: 0; padding: 0; border: 0; }
legend { width: 100%; padding: 0; }
summary { cursor: pointer; }
small { display: block; color: var(--muted); font-weight: 400; }
input[type=checkbox], input[type=radio] { width: 20px; height: 20px; flex-shrink: 0; accent-color: var(--ink); }
.subtle, .micro { color: var(--muted); }
.mono, .eyebrow { font-family: var(--mono); font-size: 12px; }
.micro { font-size: 12px; }
.skip-link { position: absolute; top: -100px; left: 20px; z-index: 100; padding: 12px; background: #fff; }
.skip-link:focus { top: 12px; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 88px; padding: 24px 4vw; border-bottom: 1px solid var(--line); }
.wordmark { font-size: 24px; font-weight: 600; letter-spacing: -1.1px; text-decoration: none; }
.admin-return, .admin-entry { color: var(--muted); font-size: 13px; }
main { min-height: calc(100dvh - 88px); }
.consent-page, .questionnaire { width: min(760px, 100%); margin: 54px auto 0; padding: 0 24px 60px; }
.lead { font-size: 18px; line-height: 1.7; }
.study-facts { margin: 28px 0; }
.study-facts div { display: grid; grid-template-columns: 185px 1fr; gap: 20px; padding: 14px 0; border-top: 1px solid var(--line); }
.study-facts dt { color: var(--muted); font-size: 14px; }
.study-facts dd { margin: 0; }
.privacy { margin: 22px 0; font-size: 14px; }
.privacy p { margin: 18px 0 0; color: var(--muted); }
.check { display: flex; align-items: flex-start; gap: 12px; margin: 24px 0; cursor: pointer; }
.check input { margin: 3px 0 0; }
.consent-form > button { min-width: 180px; }
.admin-entry { display: inline-block; margin-top: 42px; }
.notice, .flash, .preview-note { padding: 16px 20px; border-left: 2px solid var(--ink); background: var(--wash); font-size: 14px; }
.notice { margin: 24px 0; }
.flash { margin: 20px 4vw; }
.preview-note { margin: 20px 4vw; }
.questionnaire > .preview-note { margin: 0 0 28px; }
.flash.error, .form-error { color: #9c1717; }
.form-error { margin: 24px 0; }
.field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 24px; font-size: 14px; }
.field input, .field textarea, .field select, .filter-form input, .filter-form select, .inline-form input, .inline-form select { width: 100%; min-height: 46px; padding: 11px 12px; border: 1px solid #aaa; border-radius: 0; background: #fff; color: var(--ink); }
textarea { min-height: 90px; resize: vertical; }
.age-field { max-width: 230px; margin-top: 32px; }
.choice-question, .scale-question { margin: 32px 0; padding: 0 0 30px; border-bottom: 1px solid var(--line); }
.choice-question legend, .scale-question legend { margin-bottom: 20px; line-height: 1.65; font-size: 16px; }
.choice-options { display: flex; gap: 32px; }
.choice-options label, .vertical-options label { display: flex; align-items: center; gap: 12px; cursor: pointer; }
.vertical-options { display: flex; flex-direction: column; gap: 15px; }
.scale-options { display: grid; grid-template-columns: repeat(7, 1fr); gap: 9px; }
.scale-options label { position: relative; cursor: pointer; }
.scale-options input { position: absolute; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: pointer; }
.scale-options span { display: flex; align-items: center; justify-content: center; min-height: 50px; border: 1px solid #aaa; font-family: var(--mono); }
.scale-options input:checked + span { border: 2px solid var(--ink); color: #fff; background: var(--ink); font-weight: bold; text-decoration: underline; text-underline-offset: 5px; }
.scale-options input:focus-visible + span { outline: 2px solid var(--ink); outline-offset: 3px; }
.scale-labels { display: flex; justify-content: space-between; gap: 12px; margin-top: 10px; color: var(--muted); font-size: 12px; }
.scale-labels > span { max-width: 35%; }
.scale-labels > span:last-child { text-align: right; }
.scenario { margin: 0 0 34px; padding: 24px; background: var(--wash); font-size: 16px; line-height: 1.85; }
.chosen-product { display: flex; align-items: center; gap: 24px; margin: 30px 0; padding: 20px; border: 1px solid var(--line); }
.chosen-product img { width: 140px; height: 115px; }
.chosen-product h2 { margin: 5px 0 12px; font-size: 22px; }
.chosen-product p { margin-bottom: 0; }
.participant-code { margin-top: 48px; color: var(--muted); font-size: 12px; }
.participant-code code { display: block; margin-top: 10px; overflow-wrap: anywhere; }
.debrief { margin-top: 40px; }
.debrief h2 { font-size: 24px; }
.catalog-intro { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; margin: 40px 4vw 25px; }
.catalog-intro h1 { margin: 0; }
.catalog-intro p { margin: 0; color: var(--muted); font-family: var(--mono); font-size: 13px; }
.catalog-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 76px; margin: 0 4vw 30px; padding: 14px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.catalog-toolbar > span { color: var(--muted); font-size: 14px; }
.catalog-intro ~ #catalog-loading { position: fixed; top: 88px; right: 4vw; left: 4vw; z-index: 8; max-width: 600px; margin: 16px auto; border: 1px solid var(--line); }
.product-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 44px 24px; padding: 0 4vw 50px; }
.product-card { display: flex; flex-direction: column; min-width: 0; }
.product-image { position: relative; display: block; width: 100%; padding: 0; border: 0; aspect-ratio: 1.1; background: #fff; color: var(--ink); }
.product-image:hover { background: var(--wash); }
.product-image img { width: 100%; height: 100%; padding-bottom: 30px; }
.image-badge { position: absolute; right: 0; bottom: 5px; left: 0; padding: 6px 8px; background: var(--wash); color: var(--ink); font-family: var(--mono); font-size: 11px; }
.card-brand { margin: 18px 0 7px; color: var(--muted); font-size: 12px; }
.product-card h2 { min-height: 44px; margin: 0 0 14px; font-size: 17px; line-height: 1.3; letter-spacing: -.02em; }
.title-button { display: -webkit-box; min-height: 0; padding: 0; overflow: hidden; border: 0; color: inherit; background: none; font: inherit; text-align: left; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.title-button:hover { color: var(--ink); background: none; text-decoration: underline; }
.card-price { margin: 0 0 10px; font-size: 23px; font-weight: 600; line-height: 1.3; letter-spacing: -.025em; }
.card-rating { display: flex; flex-wrap: wrap; gap: 4px 10px; margin-bottom: 15px; font-size: 12px; }
.card-rating span:last-child { color: var(--muted); }
.card-specs { margin: 0 0 22px; font-size: 12px; line-height: 1.6; }
.card-specs div { margin-bottom: 8px; }
.card-specs dt { color: var(--muted); }
.card-specs dd { margin: 0; }
.card-actions { display: grid; gap: 8px; margin-top: auto; }
.card-actions button { width: 100%; min-height: 44px; padding: 10px 6px; font-size: 12px; }
.decision-bar { position: sticky; bottom: 0; z-index: 5; display: flex; justify-content: center; padding: 16px 4vw; border-top: 1px solid var(--line); background: #fff; }
.decision-bar button { min-width: min(100%, 490px); }
.fullscreen-panel { inset: 0; width: 100%; max-width: none; height: 100dvh; max-height: none; margin: 0; padding: 0; border: 0; color: var(--ink); background: #fff; }
.fullscreen-panel[open] { display: flex; flex-direction: column; }
dialog::backdrop { background: #0007; }
.panel-header { display: flex; flex-shrink: 0; align-items: center; justify-content: space-between; gap: 20px; padding: 20px 4vw; border-bottom: 1px solid var(--line); }
.panel-header h2 { margin: 0; font-size: 24px; }
.panel-header button { flex-shrink: 0; }
.panel-scroll { flex: 1; min-height: 0; overflow: auto; padding: 30px 4vw; }
.panel-actions { display: flex; flex-shrink: 0; justify-content: flex-end; padding: 16px 4vw; border-top: 1px solid var(--line); background: #fff; }
.panel-actions button { min-width: 280px; }
.detail-layout { display: grid; grid-template-columns: 1.1fr 1fr; gap: 5vw; max-width: 1400px; margin: 0 auto; }
.detail-image img { width: 100%; height: auto; max-height: 550px; }
.detail-info h2 { margin: 10px 0 25px; font-size: 35px; }
.spec-list { margin-top: 30px; }
.spec-list div { display: grid; grid-template-columns: 145px 1fr; gap: 16px; padding: 13px 0; border-top: 1px solid var(--line); font-size: 14px; }
.spec-list dt { color: var(--muted); }
.spec-list dd { margin: 0; }
.confirm-dialog { width: min(520px, calc(100% - 32px)); max-height: calc(100dvh - 32px); padding: 32px; border: 0; color: var(--ink); }
.confirm-dialog h2 { font-size: 28px; }
.confirm-dialog > p { font-size: 14px; }
.confirmation-product img { width: 180px; height: 139px; margin: 0 auto 20px; }
.confirm-actions { display: grid; gap: 10px; margin-top: 28px; }
.comparison-scroll { flex: 1; min-height: 0; overflow: auto; }
table { width: 100%; border-collapse: separate; border-spacing: 0; text-align: left; font-size: 13px; }
th, td { padding: 18px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 500; }
thead th { background: var(--wash); font-size: 12px; }
.comparison-table { min-width: 1650px; }
.comparison-table thead th { position: sticky; top: 0; z-index: 2; }
.comparison-table th:first-child { position: sticky; left: 0; z-index: 1; width: 225px; min-width: 225px; border-right: 1px solid var(--line); background: #fff; }
.comparison-table thead th:first-child { z-index: 3; background: var(--wash); }
.comparison-table .choose-button { width: 100%; margin-top: 14px; padding: 10px 7px; font-size: 12px; }
.comparison-table .title-button { font-size: 14px; }
.network-status { position: fixed; bottom: 18px; left: 50%; z-index: 100; width: min(600px, calc(100% - 32px)); padding: 15px 20px; transform: translateX(-50%); color: #fff; background: var(--ink); font-size: 13px; }
.network-status button { min-height: 36px; margin: 10px 0 0 10px; padding: 7px 12px; border-color: #aaa; }
.error-page, .login-page { max-width: 580px; margin: 60px auto; padding: 0 24px; }
.admin-shell { margin: 45px 4vw; }
.admin-title, .section-heading { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.admin-title h1 { font-size: 36px; }
.admin-nav { display: flex; flex-wrap: wrap; gap: 28px; margin: 25px 0; border-bottom: 1px solid var(--line); }
.admin-nav a { padding: 0 0 14px; font-size: 14px; text-decoration: none; }
.admin-nav a[aria-current] { border-bottom: 2px solid var(--ink); }
.admin-status, .status-actions, .funnel, .export-links, .preview-links { display: flex; flex-wrap: wrap; gap: 15px; }
.admin-status { color: var(--muted); }
.admin-section { margin: 38px 0; padding: 0 0 35px; border-bottom: 1px solid var(--line); }
.admin-section > p { max-width: 980px; }
.status-actions { margin: 24px 0; }
.table-wrap { overflow: auto; }
.table-wrap table { min-width: 760px; }
.filter-form, .inline-form { display: flex; flex-wrap: wrap; align-items: end; gap: 14px; margin: 25px 0; }
.filter-form label, .inline-form label { display: flex; flex-direction: column; gap: 8px; font-size: 13px; }
.filter-form select, .filter-form input { font-size: 14px; }
.filter-form > a { padding-bottom: 12px; }
.funnel { margin: 24px 0; }
.export-links h3 { width: 100%; }
.export-links a, .preview-links a { font-size: 13px; }
.participant-list details { padding: 18px 0; border-top: 1px solid var(--line); }
.participant-list pre { max-height: 350px; overflow: auto; padding: 20px; background: var(--wash); font-size: 12px; }
.participant-list form { max-width: 650px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; max-width: 1000px; }
.admin-thumb { width: 95px; height: 76px; }
.product-edit-image { width: 300px; height: 232px; }
.csv-fields { display: block; padding: 18px; overflow-wrap: anywhere; background: var(--wash); font-size: 12px; }
@media (max-width: 1199px) {
  .product-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .site-header { min-height: 74px; padding: 20px 5vw; }
  .wordmark { font-size: 22px; }
  .admin-return { font-size: 12px; }
  .consent-page, .questionnaire { margin-top: 32px; padding: 0 5vw 40px; }
  .lead { font-size: 16px; }
  .study-facts div { grid-template-columns: 1fr; gap: 3px; padding: 12px 0; }
  .scale-options { gap: 5px; }
  .scale-options span { min-height: 44px; }
  .scale-labels { gap: 8px; font-size: 11px; }
  .scenario { padding: 18px; font-size: 15px; }
  .catalog-intro { margin: 28px 5vw 22px; flex-wrap: wrap; gap: 8px; }
  .catalog-intro h1 { font-size: 32px; }
  .catalog-intro p { font-size: 12px; }
  .catalog-toolbar { margin: 0 5vw 24px; flex-wrap: wrap; gap: 12px; }
  .catalog-toolbar button { font-size: 12px; }
  .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 34px 16px; padding: 0 5vw 35px; }
  .product-image { aspect-ratio: 1; }
  .image-badge { padding: 5px; font-size: 9px; }
  .card-brand { margin-top: 13px; font-size: 11px; }
  .product-card h2 { min-height: 40px; font-size: 15px; }
  .card-price { font-size: 20px; }
  .card-rating { font-size: 11px; }
  .card-specs { font-size: 11px; }
  .card-actions button { font-size: 11px; }
  .decision-bar { padding: 12px 5vw; }
  .decision-bar button { width: 100%; padding: 11px; font-size: 12px; }
  .panel-header { padding: 16px 5vw; }
  .panel-header h2 { font-size: 20px; }
  .panel-header button { min-height: 40px; padding: 8px 14px; font-size: 12px; }
  .panel-scroll { padding: 20px 5vw; }
  .panel-actions { padding: 12px 5vw; }
  .panel-actions button { width: 100%; min-width: 0; }
  .detail-layout { display: block; }
  .detail-image img { max-height: 260px; }
  .detail-info h2 { font-size: 28px; }
  .spec-list div { grid-template-columns: 100px 1fr; font-size: 13px; }
  .confirm-dialog { padding: 24px; }
  .chosen-product { gap: 15px; padding: 15px; }
  .chosen-product img { width: 95px; height: 74px; }
  .chosen-product h2 { font-size: 18px; }
  .comparison-table th:first-child { width: 180px; min-width: 180px; }
  .comparison-table .choose-button { font-size: 11px; }
  .admin-shell { margin: 30px 5vw; }
  .admin-title h1 { font-size: 28px; }
  .admin-nav { gap: 18px; }
  .admin-nav a { font-size: 12px; }
  .form-grid { grid-template-columns: 1fr; }
  .section-heading { align-items: flex-start; }
  .section-heading h2 { font-size: 22px; }
  .section-heading .button { padding: 10px 12px; font-size: 12px; }
}