:root {
  font-family: "Segoe UI", Arial, sans-serif;
  color-scheme: light;
  --text: #17212b;
  --page: #f6f8fa;
  --surface: #fff;
  --heading: #17324d;
  --border: #d5dbe1;
  --accent: #356a93;
  --input-border: #718096;
  --focus: #8ab4d6;
  --muted: #4b5563;
  --danger: #9b1c1c;
  --tint: #eef5fa;
  --loader: #b7cddd;
  --strong-border: #aab4be;
  --warning-surface: #fff8e6;
  --warning: #8a5700;
  --success: #176b3a;
  --danger-border: #d9a2a2;
  --danger-surface: #fff7f7;
  --divider: #e5e9ed;
  --choice-border: #c4ccd4;
  --warning-border: #d7b66f;
  --toolbar: #eef1f4;
  --toolbar-text: #526171;
  --hover: #f0f4f8;
  --region-focus: #90a4b8;
  --selected: #e8f1f8;
  --accepted: #526f46;
  --link: #15558a;
  --phone-border: #263747;
  --bubble: #edf0f3;
  --credential: #f4f6f8;
  --primary: #17324d;
  --header: #17324d;
  --on-primary: #ffffff;
  --preview: #17212b;
  --danger-button: #9b1c1c;
  color: var(--text);
  background: var(--page);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --text: #e1e7ee;
  --page: #0c1620;
  --surface: #142231;
  --heading: #c4dff5;
  --border: #3f5266;
  --accent: #8fc7ee;
  --input-border: #7c91a7;
  --focus: #a2d7ff;
  --muted: #afbcca;
  --danger: #ffaaa5;
  --tint: #203449;
  --loader: #55718b;
  --strong-border: #71879c;
  --warning-surface: #332d1b;
  --warning: #f1c774;
  --success: #91d5ac;
  --danger-border: #a76b74;
  --danger-surface: #3b222a;
  --divider: #3f5266;
  --choice-border: #667d94;
  --warning-border: #b69340;
  --toolbar: #1d2f41;
  --toolbar-text: #b8c9da;
  --hover: #294257;
  --region-focus: #a2d7ff;
  --selected: #263e53;
  --accepted: #aed399;
  --link: #a2d7ff;
  --phone-border: #71879c;
  --bubble: #243447;
  --credential: #1d2c3c;
  --primary: #244d70;
  --header: #101d2a;
  --on-primary: #ffffff;
  --preview: #08131e;
  --danger-button: #9b1c1c;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    color-scheme: dark;
    --text: #e1e7ee;
    --page: #0c1620;
    --surface: #142231;
    --heading: #c4dff5;
    --border: #3f5266;
    --accent: #8fc7ee;
    --input-border: #7c91a7;
    --focus: #a2d7ff;
    --muted: #afbcca;
    --danger: #ffaaa5;
    --tint: #203449;
    --loader: #55718b;
    --strong-border: #71879c;
    --warning-surface: #332d1b;
    --warning: #f1c774;
    --success: #91d5ac;
    --danger-border: #a76b74;
    --danger-surface: #3b222a;
    --divider: #3f5266;
    --choice-border: #667d94;
    --warning-border: #b69340;
    --toolbar: #1d2f41;
    --toolbar-text: #b8c9da;
    --hover: #294257;
    --region-focus: #a2d7ff;
    --selected: #263e53;
    --accepted: #aed399;
    --link: #a2d7ff;
    --phone-border: #71879c;
    --bubble: #243447;
    --credential: #1d2c3c;
    --primary: #244d70;
    --header: #101d2a;
    --on-primary: #ffffff;
    --preview: #08131e;
    --danger-button: #9b1c1c;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; line-height: 1.5; }
a { color: var(--link); }
.shell { width: min(72rem, calc(100% - 2rem)); margin-inline: auto; }
.site-header { background: var(--header); color: var(--on-primary); padding: 1rem 0; }
.brand { font-weight: 700; }
main { padding-block: 3rem; }
.skip-link { position: absolute; left: -9999px; top: 0; }
.skip-link:focus { left: 1rem; top: 1rem; z-index: 10; padding: .75rem; background: var(--surface); color: var(--heading); }
.status-panel { max-width: 48rem; background: var(--surface); border: 1px solid var(--border); padding: clamp(1.5rem, 4vw, 3rem); }
.admin-panel { background: var(--surface); border: 1px solid var(--border); padding: clamp(1.5rem, 4vw, 3rem); }
.admin-panel--narrow { max-width: 48rem; }
.auth-panel { max-width: 36rem; background: var(--surface); border: 1px solid var(--border); padding: clamp(1.5rem, 4vw, 3rem); }
.eyebrow { color: var(--accent); font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }
h1 { margin-top: 0; color: var(--heading); font-size: clamp(2rem, 6vw, 3.25rem); line-height: 1.1; }
.status-list { margin-top: 2rem; }
.status-list div { display: grid; grid-template-columns: minmax(10rem, 1fr) 2fr; gap: 1rem; padding: .75rem 0; border-top: 1px solid var(--border); }
dt { font-weight: 700; }
dd { margin: 0; }
.form-field { display: grid; gap: .4rem; margin-block: 1rem; }
.form-field label { font-weight: 700; }
.form-field input, .form-field select { width: 100%; min-height: 2.75rem; border: 1px solid var(--input-border); border-radius: .2rem; padding: .55rem .65rem; font: inherit; color: var(--text); background: var(--surface); }
.form-field input:focus, .form-field select:focus { outline: .2rem solid var(--focus); outline-offset: .1rem; }
.field-hint { color: var(--muted); max-width: 60rem; }
.field-validation-error, .validation-summary { color: var(--danger); }
.validation-summary:empty { display: none; }
button { border: 0; border-radius: .2rem; background: var(--primary); color: var(--on-primary); cursor: pointer; font: inherit; font-weight: 700; padding: .7rem 1rem; }
button:focus { outline: .2rem solid var(--focus); outline-offset: .15rem; }
button:disabled { cursor: wait; opacity: .7; }
.button-secondary { background: var(--surface); border: 1px solid var(--heading); color: var(--heading); }
.button-danger { background: var(--danger-button); }
.button-link { display: inline-block; border-radius: .2rem; background: var(--primary); color: var(--on-primary); font-weight: 700; padding: .7rem 1rem; text-decoration: none; }
.button-link:focus { outline: .2rem solid var(--focus); outline-offset: .15rem; }
.secondary-action { margin-top: 1rem; }
.status-message { border-left: .25rem solid var(--accent); background: var(--tint); padding: .75rem 1rem; }
.disclosure { margin-block: 2rem; padding-block: 1.25rem; border-block: 1px solid var(--border); }
.disclosure h2 { margin-top: 0; color: var(--heading); }
.database-wait { align-items: flex-start; display: flex; gap: 1rem; margin-top: 1.5rem; padding: 1rem; background: var(--tint); border-left: .25rem solid var(--accent); }
.database-wait p { margin: 0 0 .75rem; }
.database-wait__message { color: var(--heading); font-weight: 700; }
.loading-indicator { flex: 0 0 auto; width: 1.5rem; height: 1.5rem; margin-top: .15rem; border: .2rem solid var(--loader); border-top-color: var(--heading); border-radius: 50%; animation: loading-indicator-spin .9s linear infinite; }
.heading-actions { align-items: flex-start; display: flex; justify-content: space-between; gap: 1.5rem; }
.heading-actions h1 { margin-bottom: .5rem; }
.empty-state { margin-block: 2rem; padding: 1rem; background: var(--page); border: 1px dashed var(--strong-border); }
.notice { margin-block: 2rem; padding: 1rem; background: var(--warning-surface); border-left: .25rem solid var(--warning); }
.data-table-wrapper { margin-block: 1.5rem 2rem; overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; min-width: 48rem; }
.data-table th, .data-table td { padding: .75rem; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
.data-table thead th { color: var(--heading); background: var(--tint); white-space: nowrap; }
.data-table tbody th { font-weight: 700; }
.campaign-summary { margin-bottom: 1rem; }
.roster-totals { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.5rem; }
.roster-totals span { padding: .35rem .65rem; background: var(--tint); border-radius: 1rem; }
.validation-state { display: inline-block; }
.validation-state--accepted { color: var(--success); }
.validation-state--warning { color: var(--warning); }
.validation-state--rejected { color: var(--danger); }
.validation-messages { margin: .35rem 0 0; padding-left: 1.2rem; }
.form-field--checkbox label { display: flex; align-items: flex-start; gap: .65rem; cursor: pointer; }
.form-field--checkbox input { flex: 0 0 auto; width: 1.25rem; min-height: 0; height: 1.25rem; margin: .2rem 0 0; padding: 0; accent-color: var(--heading); }
.assignment-resume { margin-block: 1.5rem; padding: 1rem; background: var(--tint); border-left: .25rem solid var(--accent); }
.assignment-resume p { margin: .35rem 0 0; }
.danger-zone { margin-top: 3rem; padding: 1.25rem; border: 1px solid var(--danger-border); background: var(--danger-surface); }
.danger-zone h2 { margin-top: 0; color: var(--danger); }
.scenario-shell { max-width: 64rem; }
.scenario-progress { display: grid; grid-template-columns: auto minmax(10rem, 22rem); align-items: center; gap: 1rem; margin-bottom: 2rem; color: var(--heading); font-weight: 700; }
.scenario-progress progress { width: 100%; height: .8rem; accent-color: var(--accent); }
.scenario-context { max-width: 52rem; font-size: 1.05rem; }
.message-artifact { margin-block: 2rem; padding: 1.25rem; border: 1px solid var(--strong-border); border-radius: .35rem; background: var(--surface); box-shadow: 0 .25rem .8rem rgb(23 50 77 / 8%); }
.message-artifact--stage { margin-top: -1rem; border-left: .3rem solid var(--accent); }
.message-artifact__field { display: grid; grid-template-columns: minmax(8rem, 1fr) 3fr; gap: 1rem; padding: .55rem 0; border-bottom: 1px solid var(--divider); overflow-wrap: anywhere; }
.message-artifact__field:last-child { border-bottom: 0; }
.message-artifact__field strong { color: var(--heading); text-transform: capitalize; }
.scenario-action { margin-block: 1.5rem 2.5rem; padding: 1rem; border-left: .25rem solid var(--accent); background: var(--tint); }
.scenario-action p { margin-top: 0; }
.scenario-question { margin-block: 2rem; padding: 1.25rem; border: 1px solid var(--border); background: var(--surface); }
.scenario-question legend { padding-inline: .35rem; color: var(--heading); font-size: 1.3rem; font-weight: 700; }
.scenario-question h2 { font-size: 1.05rem; }
.evidence-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.choice-card { display: flex; align-items: flex-start; gap: .75rem; margin-block: .7rem; padding: .8rem; border: 1px solid var(--choice-border); border-radius: .25rem; cursor: pointer; }
.choice-card:has(input:checked) { border-color: var(--accent); background: var(--tint); }
.choice-card input { flex: 0 0 auto; width: 1.15rem; height: 1.15rem; margin-top: .2rem; accent-color: var(--heading); }
.choice-card:has(input:focus) { outline: .2rem solid var(--focus); outline-offset: .1rem; }
.choice-card:has(input:disabled) { cursor: not-allowed; opacity: .6; }
.autosave-status { min-height: 1.5rem; margin-bottom: 0; color: var(--muted); }
.commit-panel { margin-block: 2rem; padding: 1.25rem; border: 1px solid var(--warning-border); background: var(--warning-surface); }
.commit-panel p { margin-top: 0; }
.scenario-review-list { display: grid; gap: 1.5rem; margin-block: 2rem; }
.scenario-review { padding: 1.5rem; border: 1px solid var(--border); background: var(--surface); }
.scenario-review h2 { margin-top: 0; color: var(--heading); }

@keyframes loading-indicator-spin {
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .loading-indicator { animation: none; border-top-color: var(--loader); background: var(--heading); }
}

@media (max-width: 40rem) {
  .status-list div { grid-template-columns: 1fr; gap: .25rem; }
  .heading-actions { display: block; }
  .heading-actions .button-link { margin-bottom: 1.5rem; }
  .scenario-progress, .message-artifact__field, .evidence-columns { grid-template-columns: 1fr; }
}

/* Artifact-first participant workspace. All evidence tiers share the same live affordance. */
.shell--scenario { width: min(94rem, calc(100% - 3rem)); }
.scenario-shell { max-width: none; }
.scenario-grid { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(22rem, 1fr); gap: clamp(1.5rem, 3vw, 3rem); align-items: start; }
.scenario-progress { grid-template-columns: 1fr minmax(10rem, 18rem); margin-bottom: 1rem; }
.scenario-progress h1 { font-size: 1.75rem; margin: 0; }
.artifact-column, .reasoning-panel { min-width: 0; }
.artifact-column > h2, .reasoning-panel > h2 { font-size: 1.3rem; margin-top: 0; }
.scenario-context { font-size: 1rem; margin-bottom: 1.5rem; }
.reasoning-panel { background: var(--surface); border: 1px solid var(--border); border-radius: .5rem; padding: 1.25rem; }
.reasoning-panel h3 { font-size: 1rem; }
.reasoning-panel .scenario-question { margin-block: 1.25rem; padding: .8rem; }
.reasoning-panel .scenario-question legend { font-size: 1.05rem; }
.reasoning-panel .choice-card { padding: .6rem; margin-block: .5rem; font-size: .95rem; }
.reasoning-panel .commit-panel { margin-bottom: 0; }
.mail-client { border: 1px solid var(--strong-border); border-radius: .6rem; background: var(--surface); overflow-wrap: anywhere; box-shadow: 0 .35rem 1.4rem rgb(23 50 77 / 8%); margin-block: 1.5rem; }
.client-toolbar { padding: .8rem 1.25rem; background: var(--toolbar); border-bottom: 1px solid var(--border); color: var(--toolbar-text); border-radius: .6rem .6rem 0 0; font-size: .85rem; }
.mail-header { padding: 1.3rem 1.5rem; border-bottom: 1px solid var(--divider); }
.mail-header h2 { font-size: 1.35rem; margin: 0 0 1rem; font-weight: 600; }
.mail-header div { font-size: .9rem; margin-block: .25rem; }
.mail-body { padding: 1.5rem; min-height: 15rem; font-family: Arial, sans-serif; line-height: 1.65; }
.mail-body p { white-space: pre-wrap; margin-top: 0; }
.artifact-region { display: inline; color: inherit; background: transparent; border: 1px solid transparent; border-radius: .2rem; padding: .12rem .08rem; font: inherit; text-align: left; cursor: pointer; }
button.artifact-region:hover, button.artifact-region:focus-visible { background: var(--hover); outline: 2px solid var(--region-focus); outline-offset: 1px; }
button.artifact-region[aria-pressed="true"], .artifact-region.is-selected { border: 1px solid var(--accent); background: var(--selected); }
.artifact-region small { font: 700 .7rem "Segoe UI", sans-serif; margin-left: .4rem; }
.artifact-region.is-accepted, .artifact-link.is-accepted { outline: 2px dashed var(--accepted); outline-offset: 2px; }
.artifact-link { display: inline; font: inherit; color: var(--link); text-decoration: underline; background: transparent; border: 0; padding: .15rem 0; text-align: left; cursor: pointer; }
.artifact-link-wrapper { position: relative; display: inline-block; }
.destination-preview { display: none; position: absolute; bottom: calc(100% + .4rem); left: 0; width: max-content; max-width: min(28rem, 75vw); padding: .5rem; background: var(--preview); color: var(--on-primary); border-radius: .3rem; font: .8rem "Segoe UI", sans-serif; z-index: 5; overflow-wrap: anywhere; }
.artifact-link-wrapper:hover .destination-preview, .artifact-link-wrapper:focus-within .destination-preview { display: block; }
.link-inspection { position: fixed; inset: auto; margin: 0; max-width: min(28rem, calc(100vw - 1.5rem)); border: 1px solid var(--strong-border); border-radius: .5rem; padding: 1rem; background: var(--surface); color: var(--text); box-shadow: 0 .7rem 2rem rgb(0 0 0 / 18%); }
.link-inspection button { display: block; width: 100%; margin-top: .5rem; text-align: left; }
.inspection-destination, .review-destination { overflow-wrap: anywhere; font-family: monospace; font-size: .85rem; }
.selected-evidence { display: flex; align-items: start; gap: .7rem; padding: .7rem 0; border-bottom: 1px solid var(--divider); }
.selected-evidence span { flex: 1; overflow-wrap: anywhere; font-size: .9rem; }
.selected-evidence button { font-size: .8rem; padding: .3rem .5rem; }
.message-phone { max-width: 24rem; margin-inline: auto; border: .4rem solid var(--phone-border); border-radius: 1.8rem; }
.message-phone .client-toolbar { border-radius: 1.35rem 1.35rem 0 0; text-align: center; }
.message-phone__header { padding: 1rem; text-align: center; border-bottom: 1px solid var(--divider); font-size: .9rem; }
.text-bubble { border-radius: 1rem; background: var(--bubble); padding: .9rem; }
.document-address { border-bottom: 1px solid var(--divider); padding: .8rem 1.25rem; font-family: monospace; font-size: .85rem; }
.document-title { padding: 1rem 1.5rem 0; font-size: 1.4rem; margin: 0; }
.credential-illustration { display: grid; gap: .7rem; max-width: 20rem; color: var(--muted); }
.credential-illustration span { display: block; border: 1px solid var(--strong-border); padding: .7rem; background: var(--credential); }
dialog { width: min(52rem, calc(100% - 2rem)); max-height: calc(100dvh - 2rem); overflow-y: auto; border: 1px solid var(--strong-border); border-radius: .65rem; padding: 1.5rem; color: var(--text); background: var(--surface); }
dialog::backdrop { background: rgb(13 30 46 / 55%); }
.dialog-heading { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.dialog-heading h2 { font-size: 1.2rem; margin: 0; }
dialog .mail-client { margin-bottom: 0; }
[data-commit-dialog] { max-width: 34rem; }
[data-commit-dialog] dl { margin-block: 1.5rem; }
[data-commit-dialog] dd { margin-bottom: .8rem; }
.completion-grid { display: grid; grid-template-columns: minmax(12rem, 1fr) minmax(0, 2fr); gap: 2rem; margin-block: 2rem; align-items: start; }
.review-navigation { display: grid; gap: .6rem; }
.review-navigation button { background: var(--surface); border: 1px solid var(--strong-border); color: var(--heading); text-align: left; padding: 1rem; }
.review-navigation button[aria-expanded="true"] { background: var(--selected); border-left: .3rem solid var(--accent); }
.response-comparison { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.response-comparison section { min-width: 0; }
.response-comparison ul { padding-left: 1.2rem; }
.response-comparison dd { margin-bottom: .7rem; }
@media (min-width: 75rem) {
  .reasoning-panel { max-height: calc(100dvh - 4rem); overflow-y: auto; }
}
@media (max-width: 64rem) {
  .scenario-grid, .completion-grid { grid-template-columns: 1fr; }
  .review-navigation { grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr)); }
}
@media (max-width: 40rem) {
  .shell--scenario { width: calc(100% - 1.5rem); }
  .scenario-progress, .response-comparison { grid-template-columns: 1fr; }
  .mail-header, .mail-body { padding: 1rem; }
  .scenario-review { padding: 1rem; }
  .dialog-heading { align-items: start; }
}

.site-header__content { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; }
.theme-control { display: flex; align-items: center; gap: .5rem; font-size: .9rem; }
.theme-control select { min-height: 2.5rem; border: 1px solid var(--input-border); border-radius: .25rem; padding: .4rem .6rem; font: inherit; color: var(--text); background: var(--surface); }
.theme-control select:focus-visible { outline: .2rem solid var(--focus); outline-offset: .15rem; }

.admin-navigation { display: flex; flex-wrap: wrap; gap: .65rem 1rem; padding-block: 1rem; align-items: center; }
.admin-navigation span { color: var(--muted); font-weight: 600; }
.people-filters { display: flex; flex-wrap: wrap; gap: 1rem; align-items: end; margin-block: 1.5rem; }
.people-filters .form-field { flex: 1 1 10rem; margin: 0; }
fieldset { border: 1px solid var(--border); padding: 1rem; min-width: 0; }
fieldset:disabled { opacity: .75; }