:root {
  color: #161618;
  background: #f7f7f8;
  font-family: Arial, Helvetica, sans-serif;
  font-synthesis: none;
  --ink: #161618;
  --muted: #505057;
  --paper: #f7f7f8;
  --line: #dcdce1;
  --soft: #eeeef1;
  --white: #fff;
  --page-width: 74rem;
  --pad: clamp(1.25rem, 4vw, 3.5rem);
}

*, *::before, *::after { box-sizing: border-box; }
body { min-height: 100vh; margin: 0; display: flex; flex-direction: column; }
button, input, select { font: inherit; }
a { color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: .62; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid currentColor; outline-offset: 4px; }
:where(h1, h2, h3, p) { margin-block: 0; }
:where(h1, h2, h3) { text-wrap: balance; }
p { line-height: 1.6; }
img, video { max-width: 100%; }
.wrap { width: min(100%, var(--page-width)); margin-inline: auto; padding-inline: var(--pad); }
.main-content { flex: 1; }
.main-content:focus { outline: none; }
.skip-link { position: fixed; z-index: 3; top: .5rem; left: .5rem; padding: .65rem; color: var(--ink); background: white; transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }

.site-header { background: var(--white); border-bottom: 1px solid var(--line); }
.site-header__inner { width: min(100%, var(--page-width)); padding: 1rem var(--pad); min-height: 4.5rem; margin-inline: auto; display: flex; align-items: center; justify-content: space-between; gap: .75rem; }
.wordmark { display: grid; width: fit-content; text-decoration: none; line-height: 1; }
.wordmark__name { font-size: clamp(.95rem, 3.5vw, 1.28rem); font-weight: 900; letter-spacing: -.07em; }
.wordmark__sub { font-size: .59rem; font-weight: 700; letter-spacing: .28em; margin-top: .28rem; }
.site-nav { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: clamp(.55rem, 2vw, 1.5rem); font-size: .875rem; font-weight: 700; }
.site-nav__item, .link-button { padding: .45rem 0; text-underline-offset: .25em; }
.site-nav__item { text-decoration: none; }
.site-nav__item:hover, .site-nav__item[aria-current="page"] { text-decoration: underline; }
.link-button { background: none; border: 0; color: inherit; text-decoration: underline; }
.site-footer { border-top: 1px solid var(--line); background: var(--white); color: var(--muted); font-size: .8rem; }
.site-footer__inner { min-height: 4.4rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.site-footer a { text-underline-offset: .2em; }

.eyebrow { font-size: .7rem; line-height: 1.4; font-weight: 750; letter-spacing: .15em; text-transform: uppercase; color: var(--muted); }
.display { font-size: clamp(2.25rem, 6.5vw, 4.75rem); font-weight: 850; letter-spacing: -.075em; line-height: .98; overflow-wrap: anywhere; }
.heading { font-size: clamp(1.4rem, 3vw, 2rem); letter-spacing: -.045em; line-height: 1.14; overflow-wrap: anywhere; }
.body-copy { color: var(--muted); max-width: 62ch; }
.button { min-height: 2.85rem; display: inline-flex; width: fit-content; max-width: 100%; align-items: center; justify-content: center; gap: .65rem; border: 1px solid var(--ink); border-radius: .25rem; padding: .7rem 1.05rem; color: white; background: var(--ink); font-size: .875rem; font-weight: 700; line-height: 1.2; text-decoration: none; text-align: center; }
.button:hover:not(:disabled) { background: #34343a; }
.button--secondary { color: var(--ink); background: white; border-color: #a3a3aa; }
.button--secondary:hover:not(:disabled) { background: var(--soft); }
.button--light { color: var(--ink); background: white; border-color: white; }
.button--light:hover:not(:disabled) { background: #e0e0e5; }
.button--ghost { color: white; background: transparent; border-color: #777780; }
.button--ghost:hover:not(:disabled) { background: #333338; }
.button--small { min-height: 2.5rem; padding: .5rem .75rem; }
.actions { display: flex; align-items: center; flex-wrap: wrap; gap: .6rem; }
.arrow { font-size: 1rem; line-height: 1; }
.stack { display: grid; gap: 1rem; }

.hero { color: white; background: #151517; overflow: hidden; }
.hero__inner { display: grid; min-height: clamp(25rem, 49vw, 35rem); grid-template-columns: minmax(0, 1.22fr) minmax(0, .78fr); position: relative; isolation: isolate; align-items: center; }
.hero__copy { padding-block: clamp(3rem, 9vw, 7rem); display: grid; gap: 1.15rem; }
.hero .eyebrow { color: #bfbfc9; }
.hero .display { font-size: clamp(3.5rem, 8.4vw, 7.2rem); }
.hero__copy p:not(.eyebrow) { font-size: clamp(1rem, 1.7vw, 1.22rem); color: #d3d3dc; max-width: 38ch; }
.hero .actions { margin-top: .55rem; }
.hero__art { position: relative; margin-inline: auto; width: min(100%, 26rem); aspect-ratio: 1; display: grid; place-items: center; isolation: isolate; pointer-events: none; }
.hero__art::before { content: ""; position: absolute; inset: -22%; z-index: -1; background: radial-gradient(ellipse, #45454e 0, #222228 48%, transparent 72%); }
.hero__art img { display: block; width: 100%; height: auto; }
.gateway-info { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1.5rem; padding-block: clamp(1.75rem, 5vw, 4rem); }
.gateway-info__item { display: grid; grid-template-columns: auto minmax(0, 1fr); align-content: start; gap: .7rem 1rem; border-top: 1px solid #a7a7ae; padding-block: 1.15rem; }
.gateway-info__item p:not(.eyebrow) { grid-column: 2; }
.gateway-info__item .eyebrow { margin-top: .25rem; }

.page { padding-block: clamp(2rem, 6vw, 4rem); display: grid; gap: clamp(1.25rem, 3vw, 2rem); }
.page-heading { display: grid; gap: .75rem; }
.breadcrumb { display: flex; align-items: center; flex-wrap: wrap; gap: .45rem; color: var(--muted); font-size: .825rem; overflow-wrap: anywhere; }
.breadcrumb a { text-underline-offset: .23em; }
.panel { border: 1px solid var(--line); border-radius: .45rem; background: white; padding: clamp(1.1rem, 3vw, 2rem); min-width: 0; }
.loading { padding-block: 3rem; color: var(--muted); }
.empty { max-width: 44rem; }
.message { border-left: 3px solid #73737e; padding: .65rem .85rem; background: var(--soft); font-size: .9rem; line-height: 1.5; overflow-wrap: anywhere; }
.message--error { border-color: #8c262c; background: #faf1f2; color: #721e24; }
.badge { display: inline-flex; align-items: center; width: fit-content; gap: .4rem; border: 1px solid #d4d4da; background: var(--soft); padding: .35rem .55rem; border-radius: .25rem; font-size: .72rem; line-height: 1.2; font-weight: 750; }
.badge::before { content: ""; width: .4rem; height: .4rem; border: 1px solid #63636d; border-radius: 50%; }
.badge--active::before { background: #55555e; }

.auth { display: grid; grid-template-columns: minmax(0, .83fr) minmax(0, 1fr); gap: clamp(1.4rem, 6vw, 6rem); align-items: start; padding-block: clamp(2.2rem, 8vw, 6rem); }
.auth.auth--staff .display { font-size: clamp(2rem, 5vw, 3.75rem); }
.auth__intro { padding-top: .5rem; display: grid; gap: .9rem; }
.auth__footer { font-size: .875rem; color: var(--muted); }
.auth__footer a { color: var(--ink); font-weight: 700; text-underline-offset: .24em; }
.form { display: grid; gap: 1rem; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .9rem; }
.field { min-width: 0; display: grid; align-content: start; gap: .4rem; font-weight: 700; font-size: .87rem; }
.field input, .field select { width: 100%; min-height: 2.8rem; border: 1px solid #aaaab3; border-radius: .25rem; padding: .65rem .7rem; color: var(--ink); background: white; font-size: 1rem; font-weight: 400; }
.field__hint { font-weight: 400; color: var(--muted); font-size: .78rem; line-height: 1.4; }

.course-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); gap: 1rem; }
.course-card { display: grid; align-content: start; gap: .85rem; }
.course-card .actions { margin-top: .25rem; }
.course-card__meta { display: flex; flex-wrap: wrap; gap: .35rem .8rem; font-size: .78rem; font-weight: 700; color: var(--muted); }
.course-card__cover { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: .25rem; background: var(--soft); }
.course-card__title { font-size: 1.35rem; letter-spacing: -.035em; overflow-wrap: anywhere; }
.lesson-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(14rem, 19rem); align-items: start; gap: 1.1rem; }
.lesson-layout > * { min-width: 0; }
.module-list, .lesson-list, .assignment-list { list-style: none; margin: 0; padding: 0; }
.module-list { display: grid; gap: 1rem; }
.module__title { margin-bottom: .55rem; font-size: .9rem; }
.lesson-list li + li { border-top: 1px solid var(--line); }
.lesson-list a { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: .45rem; padding: .7rem .5rem; font-size: .875rem; line-height: 1.4; text-decoration: none; overflow-wrap: anywhere; }
.lesson-list a:hover, .lesson-list a[aria-current="page"] { background: var(--soft); text-decoration: underline; text-underline-offset: .2em; }
.lesson__content { display: grid; gap: .9rem; overflow-wrap: anywhere; }
.lesson__content p { white-space: pre-line; }
.lesson__content img, .lesson__content video { display: block; width: 100%; max-height: 70vh; border-radius: .25rem; object-fit: contain; background: var(--soft); }
.lesson__content audio { width: 100%; }
.lesson__content a { text-underline-offset: .2em; }
.lesson__content ul, .lesson__content ol { margin-block: 0; padding-inline-start: 1.4rem; line-height: 1.6; }
.lesson__content figure { margin: 0; }
.lesson__content figcaption { padding-block: .4rem; color: var(--muted); font-size: .82rem; }
.lesson__controls { padding-top: 1rem; margin-top: .1rem; border-top: 1px solid var(--line); justify-content: space-between; }

.stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .7rem; }
.stat { padding: clamp(.8rem, 2vw, 1.5rem); display: grid; gap: .4rem; }
.stat strong { font-size: clamp(1.45rem, 3.6vw, 2.4rem); line-height: 1; letter-spacing: -.045em; }
.stat .eyebrow { overflow-wrap: anywhere; }
.admin-main { display: grid; grid-template-columns: minmax(0, 1fr) minmax(16.5rem, 21rem); align-items: start; gap: 1rem; }
.admin-directory { display: grid; gap: 1rem; }
.admin-filters { display: grid; grid-template-columns: minmax(0, 1fr) minmax(8rem, .6fr); gap: .7rem; }
.student-list { display: grid; gap: .65rem; }
.student { border: 1px solid var(--line); background: white; border-radius: .3rem; }
.student summary { cursor: pointer; padding: .8rem; font-weight: 700; overflow-wrap: anywhere; }
.student summary:hover { background: var(--paper); }
.student summary .badge { margin-left: .45rem; vertical-align: middle; }
.student__details { border-top: 1px solid var(--line); padding: .85rem; display: grid; gap: .75rem; }
.student__contact { color: var(--muted); font-size: .84rem; overflow-wrap: anywhere; }
.assignment-list li { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: .6rem; padding-block: .6rem; font-size: .9rem; overflow-wrap: anywhere; }
.assignment-list li + li { border-top: 1px solid var(--line); }
.assignment-list__state { display: block; color: var(--muted); font-size: .75rem; line-height: 1.5; }
.invite-code { display: block; margin-block: .4rem; font-size: 1.12rem; user-select: all; word-break: break-all; }
.admin-message:empty { display: none; }

@media (max-width: 50rem) {
  .admin-main, .lesson-layout { grid-template-columns: minmax(0, 1fr); }
  .auth { grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: 1rem; }
  .auth .display { font-size: clamp(2.15rem, 6vw, 3.25rem); }
}

@media (max-width: 37rem) {
  .hero__inner { grid-template-columns: 1fr; min-height: 24rem; }
  .hero__copy { padding-block: 3.2rem; }
  .hero__art { position: absolute; z-index: -1; right: -20%; bottom: -18%; width: min(82vw, 24rem); opacity: .35; }
  .gateway-info, .auth, .form-grid { grid-template-columns: minmax(0, 1fr); }
  .gateway-info { gap: .2rem; }
  .auth { gap: 1.4rem; }
}

@media (max-width: 23rem) {
  .admin-filters { grid-template-columns: minmax(0, 1fr); }
  .stats { grid-template-columns: minmax(0, 1fr); }
  .assignment-list li { grid-template-columns: minmax(0, 1fr); }
}

.glossary { display: grid; gap: .7rem; margin: 0; }
.glossary dt { font-weight: 700; }
.glossary dd { margin: .18rem 0 0; color: var(--muted); line-height: 1.5; }