:root {
  color-scheme: light;
  --pine: #173f37;
  --pine-dark: #102b25;
  --paper: #fbfaf6;
  --surface: #ffffff;
  --mist: #edf2f1;
  --line: #cbd7d2;
  --ink: #172824;
  --muted: #5f716b;
  --accent: #d5ef67;
  --danger: #8d3025;
  --danger-surface: #fff0ed;
  --success: #255b42;
  --success-surface: #e8f5ea;
  --shadow: 0 18px 45px rgb(23 63 55 / 11%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: var(--paper); }
button, input, select { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: .62; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
[hidden] { display: none !important; }

.site-header { background: var(--pine); color: var(--paper); }
.site-header__inner, .page-shell { width: min(100% - 32px, 1120px); margin-inline: auto; }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 20px; }
.brand { color: inherit; text-decoration: none; font-size: .78rem; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.header-actions { display: flex; align-items: center; justify-content: flex-end; gap: 12px; }
.header-actions form { margin: 0; }
.header-label { color: rgb(255 255 255 / 72%); font-size: .9rem; }
.page-shell { padding-block: clamp(36px, 8vw, 88px); }
.eyebrow { margin: 0 0 10px; color: var(--muted); font-size: .75rem; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
h1, h2, h3 { font-family: Georgia, "Times New Roman", serif; color: var(--pine-dark); }
h1 { max-width: 700px; margin: 0; font-size: clamp(2.4rem, 7vw, 4.8rem); line-height: .98; letter-spacing: -.045em; }
h2 { margin: 0; font-size: clamp(1.65rem, 4vw, 2.35rem); line-height: 1.05; }
h3 { margin: 0; font-size: 1.35rem; }
.lead { max-width: 620px; margin: 20px 0 0; color: var(--muted); font-size: 1.05rem; line-height: 1.6; }

.panel { background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); }
.student-layout { display: grid; grid-template-columns: minmax(0, .9fr) minmax(320px, .7fr); gap: clamp(28px, 7vw, 84px); align-items: center; }
.form-card { padding: clamp(24px, 5vw, 44px); border-radius: 22px; }
.form-stack { display: grid; gap: 20px; }
.field { display: grid; gap: 8px; color: var(--pine-dark); font-size: .9rem; font-weight: 700; }
.field__hint { color: var(--muted); font-size: .8rem; font-weight: 500; }
input, select { width: 100%; min-height: 48px; border: 1px solid var(--line); border-radius: 10px; padding: 11px 13px; color: var(--ink); background: var(--surface); }
input:hover, select:hover { border-color: #91a69f; }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; border: 1px solid transparent; border-radius: 10px; padding: 11px 16px; font-weight: 800; text-decoration: none; }
.button--primary { color: var(--pine-dark); background: var(--accent); }
.button--primary:hover { background: #c8e958; }
.button--quiet { color: var(--paper); border-color: rgb(255 255 255 / 35%); background: transparent; }
.button--outline { color: var(--pine); border-color: var(--pine); background: transparent; }
.status { min-height: 24px; margin: 0; border-radius: 10px; font-size: .9rem; line-height: 1.45; }
.status:not(:empty) { padding: 12px 14px; }
.status[data-state="error"] { color: var(--danger); background: var(--danger-surface); }
.status[data-state="success"] { color: var(--success); background: var(--success-surface); }
.status[data-state="working"] { color: var(--pine); background: var(--mist); }

.access-summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--mist); }
.access-summary strong { display: block; margin-top: 2px; }
.form-section { display: grid; gap: 18px; padding-top: 22px; border-top: 1px solid var(--line); }
.file-picker { position: relative; display: grid; gap: 8px; min-height: 122px; place-items: center; border: 1.5px dashed #86a198; border-radius: 12px; padding: 18px; text-align: center; background: var(--mist); }
.file-picker input { position: absolute; inset: 0; min-height: 100%; opacity: 0; cursor: pointer; }
.file-picker__title { font-weight: 800; }
.file-picker__detail { color: var(--muted); font-size: .85rem; }
.file-picker:focus-within { outline: 3px solid var(--accent); outline-offset: 3px; }

.admin-hero, .admin-topline { display: flex; align-items: end; justify-content: space-between; gap: 24px; }
.summary-list { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0; }
.summary-card { min-width: 150px; padding: 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--mist); }
.summary-card strong { display: block; font: 2rem/1 Georgia, "Times New Roman", serif; color: var(--pine); }
.group-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); gap: 18px; }
.group-card { display: grid; gap: 20px; padding: 24px; border-radius: 16px; }
.group-card__heading { display: flex; align-items: start; justify-content: space-between; gap: 12px; }
.chip { display: inline-flex; border-radius: 999px; padding: 5px 9px; font-size: .74rem; font-weight: 800; white-space: nowrap; }
.chip--open { color: var(--success); background: var(--success-surface); }
.chip--closed { color: var(--danger); background: var(--danger-surface); }
.switch { display: flex; align-items: center; gap: 10px; font-weight: 750; }
.switch input { width: 20px; min-height: 20px; accent-color: var(--pine); }
.admin-layout { display: grid; grid-template-columns: minmax(190px, 230px) minmax(0, 1fr); gap: clamp(20px, 4vw, 42px); align-items: start; margin-top: 32px; }
.admin-nav { position: sticky; top: 20px; display: grid; gap: 5px; padding: 12px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); box-shadow: var(--shadow); }
.admin-nav__link { display: block; border-radius: 9px; padding: 11px 12px; color: var(--pine-dark); font-weight: 700; text-decoration: none; }
.admin-nav__link:hover { background: var(--mist); }
.admin-nav__link.is-active { color: var(--pine-dark); background: var(--accent); }
.admin-nav__heading { padding: 12px 12px 4px; color: var(--muted); font-size: .73rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.admin-content { min-width: 0; }
.admin-content > h2 { margin-bottom: 12px; }
.admin-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 26px; }
.admin-link { display: grid; align-content: start; gap: 9px; min-width: 0; padding: 22px; border-radius: 14px; color: var(--ink); text-decoration: none; }
.admin-link strong { color: var(--pine-dark); font: 1.5rem/1.1 Georgia, "Times New Roman", serif; }
.admin-link:hover { border-color: #91a69f; transform: translateY(-1px); }
.catalog-create { gap: 16px; margin-bottom: 22px; padding: 22px; border-radius: 16px; }
.catalog-create h2 { font-size: 1.55rem; }
.topic-toolbar, .topic-bulk { display: grid; gap: 16px; margin-bottom: 20px; padding: 20px; border-radius: 14px; }
.topic-unassigned-filter {
  display: flex;
  width: 100%;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border: 2px solid var(--pine);
  border-radius: 12px;
  padding: 12px 16px;
  color: var(--pine-dark);
  background: var(--accent);
  font-weight: 850;
  text-align: left;
}
.topic-unassigned-filter:hover { background: #c8e958; }
.topic-unassigned-filter[aria-pressed="true"] { color: var(--paper); background: var(--pine); }
.topic-unassigned-filter__count {
  display: inline-grid;
  min-width: 36px;
  min-height: 36px;
  place-items: center;
  border-radius: 999px;
  padding-inline: 9px;
  color: var(--pine-dark);
  background: var(--surface);
  font-size: 1rem;
  font-weight: 850;
}
.topic-unassigned-filter[aria-pressed="true"] .topic-unassigned-filter__count { color: var(--pine-dark); }
.topic-toolbar__filters { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.topic-toolbar .field__hint { margin: 0; }
.topic-bulk .status { min-width: 0; }
.catalog-row__heading { display: flex; align-items: start; gap: 12px; min-width: 0; }
.catalog-row__heading > div { min-width: 0; }
.catalog-row__heading .field__hint { margin: 6px 0 0; }
.topic-selection { display: grid; flex: 0 0 auto; place-items: center; padding-top: 3px; }
.topic-selection input { width: 20px; min-height: 20px; margin: 0; padding: 0; accent-color: var(--pine); }
.catalog-list { display: grid; gap: 14px; }
.catalog-row { display: grid; gap: 15px; min-width: 0; padding: 20px; border-radius: 14px; }
.catalog-row[hidden] { display: none; }
.catalog-row__heading h3 { overflow-wrap: anywhere; }
.catalog-rename { gap: 14px; }
.catalog-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.button--danger { color: var(--danger); border-color: var(--danger); background: transparent; }
.button--danger:hover { background: var(--danger-surface); }
.empty-state { margin: 0; padding: 18px; border: 1px dashed #91a69f; border-radius: 12px; color: var(--muted); }
.catalog-row input, .catalog-row, .catalog-create { overflow-wrap: anywhere; }

@media (max-width: 760px) {
  .admin-layout { grid-template-columns: minmax(0, 1fr); }
  .topic-toolbar, .topic-bulk { padding: 16px; }
  .topic-toolbar__filters { grid-template-columns: minmax(0, 1fr); }
  .admin-nav { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .admin-nav__heading { grid-column: 1 / -1; }
  .admin-links { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 420px) {
  .admin-nav { grid-template-columns: minmax(0, 1fr); }
  .catalog-actions { display: grid; grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 760px) {
  .site-header__inner { align-items: stretch; flex-direction: column; }
  .header-actions, .admin-hero, .admin-topline, .access-summary { align-items: start; flex-direction: column; }
  .header-actions { width: 100%; }
  .header-actions .button { width: 100%; }
  .student-layout { grid-template-columns: 1fr; }
  .student-layout__intro { order: -1; }
  .page-shell { width: min(100% - 24px, 1120px); }
  .form-card, .group-card { padding: 22px; }
  .button { width: 100%; }
}

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