:root {
  --color-brand-900: #003223;
  --color-brand-700: #0d8338;
  --color-brand-500: #72b038;
  --color-brand-100: #dfecbd;
  --color-brand-50: #f0f4d2;
  --color-surface: #fafcf9;
  --color-white: #fff;
  --color-text: #003223;
  --color-muted: #31554a;
  --color-border: #b8cbbf;
  --color-danger: #8d2525;
  --color-danger-soft: #fff0ef;
  --space-1: .25rem;
  --space-2: .5rem;
  --space-3: .75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --radius-sm: .25rem;
  --radius-md: .55rem;
  --focus: 0 0 0 3px var(--color-white), 0 0 0 6px var(--color-brand-700);
  --content-max: 75rem;
  color-scheme: light;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { background: var(--color-surface); color: var(--color-text); line-height: 1.5; }
body { margin: 0; min-width: 20rem; }
img { display: block; max-width: 100%; height: auto; }
a { color: var(--color-brand-700); text-underline-offset: .2em; }
a:hover { text-decoration-thickness: .16em; }
button, input, textarea { font: inherit; }
button, a, input, textarea { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 0; box-shadow: var(--focus); border-radius: var(--radius-sm); }
h1, h2, h3, p { margin-block-start: 0; }
h1 { max-width: 19ch; font-size: clamp(2rem, 5vw, 3.5rem); line-height: 1.08; letter-spacing: -.035em; }
h2 { font-size: clamp(1.35rem, 3vw, 2rem); line-height: 1.2; letter-spacing: -.02em; }

.skip-link { position: fixed; z-index: 100; left: 1rem; top: -5rem; padding: .75rem 1rem; background: var(--color-white); color: var(--color-brand-900); font-weight: 700; }
.skip-link:focus { top: 1rem; }
.site-header { background: var(--color-white); border-bottom: 1px solid var(--color-border); }
.site-header__inner { width: min(calc(100% - 2rem), var(--content-max)); min-height: 5rem; margin-inline: auto; display: flex; align-items: center; gap: var(--space-8); }
.brand { display: flex; align-items: center; gap: var(--space-3); color: var(--color-brand-900); font-weight: 800; text-decoration: none; }
.brand img { width: 3.5rem; height: 3.5rem; object-fit: contain; }
.main-nav { display: flex; gap: var(--space-6); margin-inline-end: auto; }
.main-nav a { padding-block: 1.75rem; color: var(--color-brand-900); font-weight: 650; text-decoration: none; border-bottom: 3px solid transparent; }
.main-nav a[aria-current="page"], .main-nav a:hover { border-color: var(--color-brand-500); }
.account { display: flex; align-items: center; gap: var(--space-3); }
.account__name { font-size: .9rem; font-weight: 650; }
.role-badge { padding: .2rem .55rem; border: 1px solid var(--color-brand-700); border-radius: 100vw; color: var(--color-brand-700); font-size: .78rem; font-weight: 750; }
.nav-toggle { display: none; }
.readonly-banner { padding: .65rem 1rem; background: var(--color-brand-50); border-bottom: 1px solid var(--color-brand-100); text-align: center; }
.page-shell { width: min(calc(100% - 2rem), var(--content-max)); min-height: calc(100vh - 13rem); margin-inline: auto; padding-block: clamp(2rem, 6vw, 5rem); }
.site-footer { margin-top: var(--space-12); padding: var(--space-8) max(1rem, calc((100% - var(--content-max)) / 2)); background: var(--color-brand-900); color: var(--color-white); }
.site-footer p { margin-bottom: var(--space-2); }
.site-footer .text-muted { color: var(--color-brand-100); font-size: .9rem; }
.powered-by { color: var(--color-brand-100); font-size: .78rem; }

.button { min-height: 2.75rem; display: inline-flex; justify-content: center; align-items: center; gap: var(--space-2); padding: .65rem 1rem; border: 2px solid transparent; border-radius: var(--radius-sm); cursor: pointer; font-weight: 750; text-decoration: none; }
.button--primary { background: var(--color-brand-700); color: var(--color-white); }
.button--primary:hover { background: var(--color-brand-900); }
.button--quiet { min-height: 2.25rem; padding: .35rem .7rem; background: transparent; color: var(--color-brand-900); border-color: var(--color-border); }
.button--quiet:hover { border-color: var(--color-brand-700); }
.button--full { width: 100%; }
.eyebrow { margin-bottom: var(--space-3); color: var(--color-brand-700); font-size: .77rem; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
.text-muted { color: var(--color-muted); }

.auth-layout { min-height: calc(100vh - 10rem); display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(20rem, .9fr); align-items: center; gap: clamp(2rem, 8vw, 7rem); }
.auth-brand { max-width: 40rem; }
.auth-brand img { width: clamp(10rem, 25vw, 16rem); margin-bottom: var(--space-8); }
.auth-brand > p:last-child { max-width: 42ch; color: var(--color-muted); font-size: 1.1rem; }
.auth-panel { padding: clamp(1.5rem, 5vw, 3rem); background: var(--color-white); border: 1px solid var(--color-border); border-top: .4rem solid var(--color-brand-700); border-radius: var(--radius-md); }
.public-hero { min-height: calc(100vh - 14rem); display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(18rem, .8fr); align-items: center; gap: clamp(2rem, 9vw, 8rem); }
.public-hero__copy > p:not(.eyebrow) { max-width: 48ch; color: var(--color-muted); font-size: clamp(1.05rem, 2vw, 1.3rem); }
.public-hero__brand { min-height: 25rem; display: grid; place-items: center; align-content: center; gap: var(--space-4); padding: clamp(2rem, 7vw, 5rem); background: var(--color-brand-50); border: 1px solid var(--color-brand-100); text-align: center; }
.public-hero__brand img { width: min(15rem, 70%); max-height: 12rem; object-fit: contain; }
.public-hero__brand strong { color: var(--color-brand-900); font-size: 1.25rem; }
.public-hero__brand span { color: var(--color-muted); font-size: .9rem; }
.form-stack { display: grid; gap: var(--space-6); margin-top: var(--space-8); }
.field { display: grid; gap: var(--space-2); }
.field label { font-weight: 750; }
.field input, .field select { width: 100%; min-height: 3rem; padding: .65rem .8rem; color: var(--color-text); background: var(--color-white); border: 1px solid var(--color-muted); border-radius: var(--radius-sm); }
.field input:hover { border-color: var(--color-brand-700); }
.field__help { margin: 0; color: var(--color-muted); font-size: .85rem; }
.security-note { margin: var(--space-6) 0 0; padding-top: var(--space-4); border-top: 1px solid var(--color-border); color: var(--color-muted); font-size: .85rem; }
.alert { display: grid; gap: var(--space-1); margin-block: var(--space-4); padding: var(--space-4); border-left: .3rem solid; }
.alert--error { background: var(--color-danger-soft); border-color: var(--color-danger); color: #5d1818; }
.alert--success { background: var(--color-brand-50); border-color: var(--color-brand-700); color: var(--color-brand-900); }
.alert--warning { background: #fff8db; border-color: #9b7400; color: #503b00; }

.hero { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: var(--space-8); padding-bottom: clamp(2rem, 5vw, 4rem); border-bottom: 1px solid var(--color-border); }
.hero h1 { margin-bottom: var(--space-4); }
.hero__lead { max-width: 62ch; margin-bottom: 0; color: var(--color-muted); font-size: clamp(1rem, 2vw, 1.2rem); }
.phase-marker { min-width: 12rem; padding: var(--space-4); background: var(--color-brand-50); border-left: .3rem solid var(--color-brand-500); }
.phase-marker span, .phase-marker strong { display: block; }
.phase-marker span { color: var(--color-muted); font-size: .8rem; }
.section-heading { display: grid; grid-template-columns: 1fr minmax(16rem, 30rem); align-items: end; gap: var(--space-8); margin-block: clamp(2.5rem, 7vw, 5rem) var(--space-8); }
.section-heading h2, .section-heading p { margin-bottom: 0; }
.section-heading > p { color: var(--color-muted); }
.feature-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--color-border); }
.feature-list li { display: grid; grid-template-columns: 4rem 1fr; align-items: center; gap: var(--space-6); padding-block: var(--space-6); border-bottom: 1px solid var(--color-border); }
.feature-list__index { color: var(--color-brand-700); font-size: 1.25rem; font-weight: 800; }
.feature-list li div { display: flex; justify-content: space-between; gap: var(--space-4); }
.feature-list li span:last-child { color: var(--color-muted); }
.notice { display: grid; grid-template-columns: auto 1fr; gap: var(--space-6); margin-top: clamp(2.5rem, 7vw, 5rem); padding: var(--space-8); background: var(--color-brand-900); color: var(--color-white); }
.notice__mark { width: 2rem; height: 2rem; display: grid; place-items: center; border: 2px solid var(--color-brand-500); border-radius: 50%; font-weight: 850; }
.notice h2 { margin-bottom: var(--space-2); }
.notice p { max-width: 70ch; margin: 0; color: var(--color-brand-100); }

.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: var(--space-2); padding: 0; list-style: none; }
.breadcrumbs li + li::before { content: "/"; margin-inline-end: var(--space-2); color: var(--color-muted); }
.page-heading { display: grid; grid-template-columns: 1fr minmax(18rem, 32rem); align-items: end; gap: var(--space-8); margin-block: var(--space-8); }
.page-heading h1, .page-heading p { margin-bottom: 0; }
.page-heading > p { color: var(--color-muted); }
.page-heading--action { grid-template-columns: 1fr auto; }
.editor-form { display: grid; gap: var(--space-6); max-width: 48rem; padding: clamp(1.25rem, 4vw, 2rem); background: var(--color-white); border: 1px solid var(--color-border); }
.editor-form h2 { margin-bottom: 0; }
.branding-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(18rem, 25rem); align-items: start; gap: var(--space-8); }
.brand-color-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.brand-color-grid input[type="color"] { padding: .25rem; cursor: pointer; }
.brand-preview { position: sticky; top: var(--space-4); display: grid; gap: var(--space-3); padding: var(--space-8); background: var(--color-brand-50); border: 1px solid var(--color-brand-100); }
.brand-preview img { width: 9rem; max-height: 7rem; object-fit: contain; }
.brand-preview h2, .brand-preview p { margin: 0; }
.immersive-admin-grid { display: grid; grid-template-columns: minmax(18rem, .75fr) minmax(0, 1.25fr); align-items: start; gap: var(--space-8); }
.immersive-frame-wrap { aspect-ratio: 16 / 9; margin-top: var(--space-8); background: #06120e; border: 1px solid var(--color-border); }
.immersive-frame-wrap iframe { width: 100%; height: 100%; border: 0; }
.immersive-alternative { margin-top: var(--space-8); padding: var(--space-6); background: var(--color-white); border: 1px solid var(--color-border); }
.immersive-alternative summary { cursor: pointer; color: var(--color-brand-700); font-weight: 800; }
.field textarea { width: 100%; padding: .65rem .8rem; color: var(--color-text); background: var(--color-white); border: 1px solid var(--color-muted); border-radius: var(--radius-sm); resize: vertical; }
.form-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.empty-state { max-width: 42rem; padding: clamp(2rem, 7vw, 5rem); background: var(--color-white); border: 1px solid var(--color-border); border-top: .4rem solid var(--color-brand-500); }
.course-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(18rem, 25rem); align-items: start; gap: var(--space-8); }
.publication-panel { padding: var(--space-6); background: var(--color-brand-50); border: 1px solid var(--color-brand-100); }
.publication-panel > p:not(.eyebrow) { color: var(--color-muted); }
.version-list { display: grid; gap: var(--space-3); margin: var(--space-6) 0 0; padding: var(--space-6) 0 0 1.5rem; border-top: 1px solid var(--color-border); }
.version-list li { padding-inline-start: var(--space-2); }
.version-list strong, .version-list span, .version-list code { display: block; }
.version-list span, .version-list code { color: var(--color-muted); font-size: .82rem; }
.table-wrap { overflow-x: auto; border: 1px solid var(--color-border); background: var(--color-white); }
table { width: 100%; border-collapse: collapse; }
caption { padding: var(--space-4); text-align: left; color: var(--color-muted); }
th, td { padding: var(--space-4); border-top: 1px solid var(--color-border); text-align: left; }
thead th { background: var(--color-brand-50); color: var(--color-brand-900); }
.status { white-space: nowrap; color: var(--color-brand-700); font-weight: 700; }
.error-page { max-width: 45rem; padding-block: 10vh; }
.error-page p:not(.eyebrow) { max-width: 55ch; color: var(--color-muted); font-size: 1.1rem; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.learning-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr)); gap: var(--space-6); }
.learning-card { display: grid; align-content: start; gap: var(--space-4); padding: var(--space-6); background: var(--color-white); border: 1px solid var(--color-border); border-top: .35rem solid var(--color-brand-500); }
.learning-card h2, .learning-card p { margin: 0; }
.learning-card form { align-self: end; }
.progress-block { display: grid; gap: var(--space-2); }
.progress-block div { display: flex; justify-content: space-between; gap: var(--space-4); }
.progress-block progress { width: 100%; height: .8rem; accent-color: var(--color-brand-700); }
.progress-block--compact { min-width: min(18rem, 100%); }
.player__header { display: grid; grid-template-columns: 1fr minmax(14rem, 22rem); align-items: end; gap: var(--space-8); padding-bottom: var(--space-8); border-bottom: 1px solid var(--color-border); }
.player__header h1 { margin-bottom: 0; }
.player__layout { display: grid; grid-template-columns: minmax(14rem, 19rem) minmax(0, 1fr); gap: clamp(1.5rem, 5vw, 4rem); margin-top: var(--space-8); }
.player-index { position: sticky; top: var(--space-4); align-self: start; }
.player-index h2 { font-size: 1.2rem; }
.player-index ol { display: grid; gap: var(--space-2); margin: 0 0 var(--space-6); padding: 0; list-style: none; }
.player-index a { display: flex; gap: var(--space-3); padding: .7rem; color: var(--color-brand-900); text-decoration: none; border-left: .25rem solid transparent; }
.player-index a[aria-current="page"] { background: var(--color-brand-50); border-color: var(--color-brand-700); font-weight: 750; }
.player-index li.is-complete > a::after { content: "✓"; margin-left: auto; color: var(--color-brand-700); font-weight: 850; }
.player-content { min-width: 0; padding: clamp(1.25rem, 5vw, 3rem); background: var(--color-white); border: 1px solid var(--color-border); }
.lesson-body { max-width: 70ch; min-height: 12rem; margin-block: var(--space-6); white-space: pre-wrap; }
.video-frame { position: relative; aspect-ratio: 16 / 9; margin-block: var(--space-6); background: #000; }
.video-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.save-state { margin-top: var(--space-4); color: var(--color-muted); font-size: .85rem; text-align: right; }
.rule-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.check-field { display: flex; align-items: center; gap: var(--space-3); font-weight: 700; }
.check-field input { width: 1.2rem; height: 1.2rem; }
.assessment-section { margin-top: var(--space-12); }
.attempt-admin-list { display: grid; gap: var(--space-4); }
.attempt-admin-card { display: grid; grid-template-columns: 1fr minmax(18rem, 28rem); gap: var(--space-6); padding: var(--space-6); background: var(--color-white); border: 1px solid var(--color-border); }
.attempt-admin-card h3 { margin-bottom: var(--space-2); }
.adjustment-form { display: grid; gap: var(--space-3); padding-left: var(--space-6); border-left: 1px solid var(--color-border); }
.assessment-rules { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-2); margin: 0; }
.assessment-rules div { padding: var(--space-3); background: var(--color-brand-50); }
.assessment-rules dt { color: var(--color-muted); font-size: .8rem; }
.assessment-rules dd { margin: 0; font-weight: 800; }
.attempt-notice { margin-bottom: var(--space-6); padding: var(--space-4); background: #fff8db; border-left: .3rem solid #9b7400; }
.assessment-form { display: grid; gap: var(--space-6); }
.question-card { display: grid; gap: var(--space-3); margin: 0; padding: clamp(1rem, 4vw, 2rem); background: var(--color-white); border: 1px solid var(--color-border); }
.question-card legend { max-width: 70ch; padding-inline: var(--space-2); font-size: 1.1rem; font-weight: 800; }
.question-card legend span { display: inline-grid; width: 2rem; height: 2rem; margin-right: var(--space-3); place-items: center; background: var(--color-brand-50); color: var(--color-brand-700); border-radius: 50%; }
.question-card label { display: flex; gap: var(--space-3); padding: var(--space-3); border: 1px solid transparent; cursor: pointer; }
.question-card label:hover { background: var(--color-brand-50); border-color: var(--color-brand-100); }
.question-card input { width: 1.2rem; height: 1.2rem; flex: 0 0 auto; }
.attempt-submit { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: var(--space-4); padding: var(--space-6); background: var(--color-brand-900); color: var(--color-white); }
.attempt-submit p { margin: 0; color: var(--color-brand-100); }
.result-card { max-width: 42rem; padding: clamp(2rem, 7vw, 5rem); background: var(--color-white); border: 1px solid var(--color-border); border-top: .5rem solid var(--color-danger); }
.result-card--passed { border-top-color: var(--color-brand-700); }
.result-score strong { display: block; font-size: clamp(2.5rem, 8vw, 5rem); line-height: 1; }
.adjustment-history { margin-top: var(--space-8); }
.adjustment-history li { display: grid; gap: var(--space-1); padding: var(--space-4); border-bottom: 1px solid var(--color-border); }
.upload-form { max-width: none; }
.resource-grid { display: grid; gap: var(--space-4); }
.resource-card { display: grid; grid-template-columns: 1fr minmax(18rem, 30rem); gap: var(--space-6); padding: var(--space-6); background: var(--color-white); border: 1px solid var(--color-border); }
.resource-card h3 { margin-bottom: var(--space-2); }
.resource-card form { display: grid; gap: var(--space-3); padding-left: var(--space-6); border-left: 1px solid var(--color-border); }
.safe-html-content { max-width: 70ch; padding: clamp(1.25rem, 5vw, 3rem); background: var(--color-white); border: 1px solid var(--color-border); }
.safe-html-content pre { max-width: 100%; overflow-x: auto; padding: var(--space-4); background: var(--color-brand-50); }

@media (max-width: 105rem) {
  .site-header__inner { flex-wrap: wrap; gap: var(--space-3); padding-block: var(--space-2); }
  .nav-toggle { display: inline-flex; margin-left: auto; padding: .5rem .75rem; background: var(--color-white); border: 1px solid var(--color-border); border-radius: var(--radius-sm); }
  .main-nav { display: none; order: 4; width: 100%; flex-wrap: wrap; gap: 0 var(--space-4); }
  .main-nav[data-open] { display: flex; }
  .main-nav a { padding-block: var(--space-3); }
}

@media (max-width: 62rem) {
  .site-header__inner { flex-wrap: wrap; gap: var(--space-3); padding-block: var(--space-2); }
  .nav-toggle { display: inline-flex; margin-left: auto; padding: .5rem .75rem; background: var(--color-white); border: 1px solid var(--color-border); border-radius: var(--radius-sm); }
  .main-nav { display: none; order: 4; width: 100%; }
  .main-nav[data-open] { display: flex; }
  .main-nav a { padding-block: var(--space-3); }
  .account__name { display: none; }
  .auth-layout { grid-template-columns: 1fr; padding-block: var(--space-8); }
  .auth-brand { display: grid; grid-template-columns: auto 1fr; column-gap: var(--space-6); align-items: center; }
  .auth-brand img { grid-row: 1 / 4; width: 8rem; margin: 0; }
  .section-heading, .page-heading, .course-layout, .player__header, .player__layout, .public-hero, .branding-layout, .immersive-admin-grid { grid-template-columns: 1fr; gap: var(--space-3); }
  .brand-preview { position: static; }
  .player-index { position: static; }
  .attempt-admin-card { grid-template-columns: 1fr; }
  .resource-card { grid-template-columns: 1fr; }
  .resource-card form { padding: var(--space-4) 0 0; border-left: 0; border-top: 1px solid var(--color-border); }
  .adjustment-form { padding: var(--space-4) 0 0; border-left: 0; border-top: 1px solid var(--color-border); }
}

@media (max-width: 45rem) {
  .page-shell { width: min(calc(100% - 2rem), var(--content-max)); }
  .brand span, .role-badge { display: none; }
  .brand img { width: 3rem; height: 3rem; }
  .account { margin-left: auto; }
  .nav-toggle { order: 3; margin-left: 0; }
  .main-nav { flex-direction: column; gap: 0; }
  .auth-brand { display: block; }
  .auth-brand img { width: 7rem; margin-bottom: var(--space-4); }
  .hero { grid-template-columns: 1fr; align-items: start; }
  .phase-marker { min-width: 0; }
  .feature-list li { grid-template-columns: 2.5rem 1fr; gap: var(--space-3); }
  .feature-list li div { display: grid; gap: var(--space-1); }
  .notice { padding: var(--space-6); }
  .rule-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}

@media print {
  .site-header, .site-footer, .nav-toggle, .button { display: none !important; }
  .page-shell { width: 100%; padding: 0; }
}