:root {
  color-scheme: dark;
  --bg: #09121f;
  --bg-2: rgba(18, 34, 53, .88);
  --card: rgba(23, 39, 60, .68);
  --card-2: rgba(38, 59, 82, .60);
  --line: rgba(173, 215, 243, .17);
  --text: #eef7fd;
  --muted: #a6bed2;
  --accent: #78def0;
  --accent-ink: #092533;
  --amber: #e3b341;
  --red: #f2777a;
  --radius: 14px;
  --max: 1240px;
  --shadow: 0 18px 48px rgba(1, 8, 19, .22);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #eaf3f9;
  --bg-2: rgba(237, 246, 251, .82);
  --card: rgba(255, 255, 255, .72);
  --card-2: rgba(230, 242, 249, .80);
  --line: rgba(38, 82, 112, .17);
  --text: #142f43;
  --muted: #4e697b;
  --accent: #087e9f;
  --accent-ink: #ffffff;
  --amber: #8b6300;
  --red: #a62d3f;
  --shadow: 0 18px 45px rgba(48, 87, 118, .11);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background:
    radial-gradient(900px 520px at 85% -5%, rgba(77, 162, 205, .21), transparent 70%),
    radial-gradient(760px 520px at -12% 21%, rgba(36, 139, 166, .13), transparent 72%),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 64px;
}

body:not(.calendar-page) .wrap { max-width: 900px; }

a { color: var(--accent); }

/* ---------- layout ---------- */

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

header.site {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 74%, transparent);
  backdrop-filter: blur(24px) saturate(170%);
  -webkit-backdrop-filter: blur(24px) saturate(170%);
  border-bottom: 1px solid var(--line);
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 58px;
}

.brand {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -.01em;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  display: grid;
  place-items: center;
  width: 138px;
  height: 38px;
  padding: 4px 6px;
  border-radius: 7px;
  background: #fff;
  flex: none;
}
.brand-logo img { display: block; width: 100%; height: 100%; object-fit: contain; }

nav.site { display: flex; gap: 4px; }

nav.site a {
  color: var(--muted);
  text-decoration: none;
  font-size: .88rem;
  font-weight: 600;
  padding: 8px 11px;
  border-radius: 9px;
  white-space: nowrap;
}

nav.site a:hover { color: var(--text); background: var(--card); }
nav.site a[aria-current="page"] { color: var(--accent); background: var(--card); }

.theme-toggle {
  appearance: none;
  flex: none;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  margin-left: 6px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--text);
  background: var(--card);
  font: inherit;
  font-size: 1.12rem;
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--accent); }

@media (max-width: 430px) {
  header.site .wrap { padding: 0 12px; }
  .brand { font-size: .82rem; white-space: nowrap; gap: 5px; }
  nav.site a { padding: 7px 6px; font-size: .78rem; }
  .theme-toggle { width: 33px; height: 33px; margin-left: 0; }
  .page-head h1 { font-size: 1.42rem; }
}

@media (max-width: 620px) {
  header.site .wrap { flex-wrap: wrap; padding-top: 7px; padding-bottom: 7px; gap: 5px 8px; }
  .brand { font-size: .9rem; gap: 7px; }
  .brand-logo { width: 112px; height: 32px; }
  nav.site { order: 3; width: 100%; justify-content: center; }
  .theme-toggle { order: 2; margin-left: auto; }
}

.page-head {
  padding: 28px 30px 24px;
  margin: 24px 0 18px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(115deg, color-mix(in srgb, var(--card) 88%, transparent), color-mix(in srgb, var(--card) 48%, transparent));
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
}
.page-head h1 { font-size: clamp(1.65rem, 2.7vw, 2.25rem); margin: 0 0 6px; letter-spacing: -.035em; }
.page-head p { margin: 0; color: var(--muted); font-size: .94rem; }

.meta-strip {
  display: flex; flex-wrap: wrap; gap: 6px 8px;
  margin: 14px 0 4px;
}

.pill {
  font-size: .78rem;
  color: var(--muted);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 11px;
  white-space: nowrap;
}

/* ---------- cards ---------- */

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 12px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
}

.card h2 { margin: 0 0 10px; font-size: 1.05rem; letter-spacing: -.01em; }
.card h3 { margin: 0 0 6px; font-size: .95rem; }

.month-label {
  margin: 26px 0 10px;
  font-size: .78rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
}

.day {
  display: flex;
  gap: 14px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 9px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
}

.day.is-past { opacity: .58; }
.day.is-today { border-color: var(--accent); }

.date-chip {
  flex: none;
  width: 58px;
  text-align: center;
  border-radius: 10px;
  background: var(--card-2);
  border: 1px solid var(--line);
  padding: 8px 4px;
  align-self: flex-start;
}
.date-chip .dow { font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.date-chip .dom { font-size: 1.35rem; font-weight: 700; line-height: 1.1; }
.date-chip .mon { font-size: .68rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }

.day-body { flex: 1; min-width: 0; }

.session + .session { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); }
.session .topic { font-weight: 650; font-size: 1.02rem; margin: 0 0 2px; overflow-wrap: anywhere; }
.session .teacher { color: var(--muted); font-size: .86rem; margin: 0; }

.empty-slot { color: var(--muted); font-size: .9rem; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.tally { margin-top: 10px; }
.tally-row { display: flex; align-items: center; gap: 10px; }
.tally-bar {
  flex: 1; height: 7px; border-radius: 99px; background: var(--card-2);
  overflow: hidden; min-width: 60px;
}
.tally-bar span {
  display: block; height: 100%; border-radius: 99px;
  background: linear-gradient(90deg, var(--accent), #7ae0ff);
  transition: width .35s ease;
}
.tally-count { font-size: .82rem; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }

.status-tag {
  display: inline-block; font-size: .7rem; font-weight: 700;
  letter-spacing: .08em; text-transform: uppercase;
  padding: 3px 8px; border-radius: 999px; margin-left: 6px; vertical-align: middle;
}
.tag-cancelled { background: rgba(242,119,122,.15); color: var(--red); }
.tag-done { background: rgba(77,212,192,.13); color: var(--accent); }
.tag-pending { background: rgba(227,179,65,.15); color: var(--amber); }
.tag-approved { background: rgba(77,212,192,.13); color: var(--accent); }
.tag-declined { background: rgba(139,151,165,.15); color: var(--muted); }

/* ---------- buttons & forms ---------- */

.btn {
  appearance: none;
  font: inherit;
  font-weight: 650;
  font-size: .9rem;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 15px;
  cursor: pointer;
  background: var(--accent);
  color: var(--accent-ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 42px;
  box-shadow: 0 6px 22px color-mix(in srgb, var(--accent) 19%, transparent);
  transition: filter .15s ease, background .15s ease, transform .15s ease;
}
.btn:hover { filter: brightness(1.08); transform: translateY(-1px); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.btn.ghost { background: var(--card-2); color: var(--text); border-color: var(--line); box-shadow: none; }
.btn.ghost:hover { background: var(--card); border-color: var(--accent); }
.btn.danger { background: transparent; color: var(--red); border-color: rgba(242,119,122,.4); }
.btn.small { padding: 7px 12px; font-size: .82rem; min-height: 36px; }
.btn.attending { background: rgba(77,212,192,.14); color: var(--accent); border-color: rgba(77,212,192,.45); }
.btn.block { width: 100%; }

.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

label { display: block; font-size: .86rem; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.hint { font-weight: 400; color: var(--muted); font-size: .82rem; }

input, select, textarea {
  width: 100%;
  font: inherit;
  font-size: 1rem;
  color: var(--text);
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 12px;
  min-height: 44px;
}
input:focus, select:focus, textarea:focus { outline: 2px solid rgba(77,212,192,.5); outline-offset: 1px; }
textarea { min-height: 90px; resize: vertical; }
.field { margin-bottom: 14px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 14px; }
@media (max-width: 560px) { .grid-2 { grid-template-columns: 1fr; } }

/* ---------- rating scale ---------- */

.scale-row { display: flex; gap: 8px; }

.scale-btn {
  flex: 1;
  font: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  min-height: 52px;
  border-radius: 11px;
  background: var(--bg-2);
  color: var(--muted);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: background .12s ease, color .12s ease, border-color .12s ease;
}
.scale-btn:hover { border-color: var(--accent); color: var(--text); }
.scale-btn.selected {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}

.scale-ends {
  display: flex; justify-content: space-between;
  font-size: .74rem; color: var(--muted); margin-top: 5px;
}
.scale-caption { margin: 4px 0 0; font-size: .84rem; color: var(--accent); min-height: 1.2em; }
.scale-caption.empty { color: var(--muted); }

.confidence-shift {
  display: flex; align-items: center; justify-content: center;
  gap: 22px; text-align: center; margin-top: 12px;
}
.big-number { font-size: 2.3rem; font-weight: 700; line-height: 1.1; }
.big-number.accent { color: var(--accent); }
.confidence-shift .arrow { font-size: 1.5rem; color: var(--muted); padding-top: 14px; }

.session .topic-link { color: var(--text); text-decoration: none; }
.session .topic-link:hover { color: var(--accent); }

/* ---------- cohort availability (from the PDF rota) ---------- */

.availability-heading,
.day.has-availability {
  display: grid;
  grid-template-columns: 58px minmax(245px, 1fr) minmax(390px, .95fr);
  gap: 14px;
}
.availability-heading {
  align-items: end;
  padding: 0 14px 7px;
  color: var(--muted);
  font-size: .72rem;
}
.availability-heading-title { grid-column: 3; text-align: center; font-weight: 700; text-transform: uppercase; letter-spacing: .11em; }
.availability-heading-cells { grid-column: 3; }
.availability-heading-cells,
.availability-cells {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 4px;
}
.availability-heading-cell { text-align: center; line-height: 1.2; color: var(--muted); }
.availability-heading-cell span,
.availability-heading-cell strong { display: block; font-size: .68rem; }
.availability-heading-cell strong { font-weight: 650; }
.availability-heading-cell::before { content: ''; display: block; height: 3px; border-radius: 99px; margin-bottom: 7px; background: var(--cohort); }
.day.has-availability { margin-bottom: 3px; }
.availability-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 70px;
  min-width: 0;
  padding: 5px 3px;
  border-radius: 8px;
  text-align: center;
  font-size: .72rem;
  line-height: 1.15;
  overflow-wrap: anywhere;
}
.availability-cell.status-available {
  background: color-mix(in srgb, var(--cohort) 44%, transparent);
  border: 1px solid color-mix(in srgb, var(--cohort) 58%, transparent);
  color: var(--text);
}
.availability-cell.status-assessment {
  background: rgba(158, 169, 181, .32);
  border: 1px solid rgba(177, 190, 203, .30);
  color: var(--text);
}
.availability-cell.status-break {
  background: rgba(196, 82, 92, .5);
  border: 1px solid rgba(240, 129, 133, .48);
  color: #fff;
}
.availability-cell.status-unlisted { border: 0; background: transparent; }
.availability-cell.status-break::after { content: 'Break'; font-size: .68rem; font-weight: 700; }
.availability-cell.status-break .availability-label { display: none; }
.availability-label { font-size: .68rem; font-weight: 750; }
.cohort-short { display: none; }
.cohort-gold { --cohort: #e7bf55; }
.cohort-yellow { --cohort: #e4d836; }
.cohort-sage { --cohort: #a5bd98; }
.cohort-blue { --cohort: #82acd0; }
.cohort-pink { --cohort: #d2a1b8; }
.availability-editor-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.availability-edit {
  display: grid;
  gap: 7px;
  padding: 12px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cohort);
  border-radius: 12px;
  background: var(--card-2);
}
.availability-edit strong { font-size: .82rem; }
.availability-edit select, .availability-edit input { min-width: 0; font-size: .86rem; }

:root[data-theme="light"] .availability-cell.status-available {
  background: color-mix(in srgb, var(--cohort) 65%, white);
  color: #153146;
}
:root[data-theme="light"] .availability-cell.status-assessment { background: #dce4e8; color: #203747; }
:root[data-theme="light"] .availability-cell.status-break { background: #bb5a64; }

@media (max-width: 850px) {
  .availability-heading { display: none; }
  .day.has-availability { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 9px; }
  .day.has-availability .day-body { flex: 1; }
  .availability-cells { flex: 1 0 100%; grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .availability-cell { min-height: 46px; padding: 6px; flex-direction: column; gap: 2px; }
  .cohort-short { display: block; font-size: .63rem; font-weight: 750; }
  .availability-cell.status-unlisted { display: none; }
  .availability-cell.status-break::after { font-size: .62rem; }
}

@media (max-width: 620px) {
  .availability-editor-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 500px) {
  .page-head { padding: 22px 18px; margin: 16px 0; border-radius: 20px; }
  .day { padding: 12px; }
  .availability-cells { gap: 3px; }
}

/* ---------- notices ---------- */

.notice {
  border-radius: 10px;
  padding: 11px 13px;
  font-size: .89rem;
  margin-bottom: 12px;
  border: 1px solid;
}
.notice.ok { background: rgba(77,212,192,.1); border-color: rgba(77,212,192,.35); color: #a6efe3; }
.notice.err { background: rgba(242,119,122,.1); border-color: rgba(242,119,122,.35); color: #ffb4b6; }
.notice.info { background: rgba(139,151,165,.09); border-color: var(--line); color: var(--muted); }
:root[data-theme="light"] .notice.ok { color: #116b55; }
:root[data-theme="light"] .notice.err { color: #a62d3f; }
.notice:empty { display: none; }

.muted { color: var(--muted); }
.small { font-size: .85rem; }
.center { text-align: center; }

/* ---------- toast ---------- */

#toast {
  position: fixed; left: 50%; bottom: 20px; transform: translate(-50%, 20px);
  background: var(--card-2); color: var(--text);
  border: 1px solid var(--line); border-radius: 11px;
  padding: 11px 16px; font-size: .89rem; font-weight: 600;
  box-shadow: 0 12px 34px rgba(0,0,0,.5);
  opacity: 0; pointer-events: none; transition: all .22s ease; z-index: 60;
  max-width: calc(100vw - 32px); text-align: center;
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- modal ---------- */

.modal-backdrop {
  position: fixed; inset: 0; background: rgba(3, 6, 10, .75);
  display: none; align-items: center; justify-content: center;
  padding: 16px; z-index: 50;
}
.modal-backdrop.show { display: flex; }
.modal {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 16px; padding: 20px; width: 100%; max-width: 420px;
  max-height: 90vh; overflow-y: auto;
}
.modal h2 { margin-top: 0; }

/* ---------- tabs ---------- */

.tabs { display: flex; gap: 6px; overflow-x: auto; margin: 18px 0 16px; padding-bottom: 4px; }
.tabs button {
  font: inherit; font-size: .87rem; font-weight: 650;
  background: var(--card); color: var(--muted);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 14px; cursor: pointer; white-space: nowrap; min-height: 38px;
}
.tabs button.active { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------- misc ---------- */

.row-between { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

.slot-row { display: flex; gap: 8px; margin-bottom: 8px; flex-wrap: wrap; }
.slot-row select { flex: 1 1 165px; width: auto; min-width: 0; max-width: 100%; }
.slot-row input { flex: 2 1 165px; min-width: 0; }

.attendee-list {
  margin: 10px 0 0; padding: 10px 12px; background: var(--bg-2);
  border: 1px solid var(--line); border-radius: 10px;
  font-size: .85rem; color: var(--muted); max-height: 190px; overflow-y: auto;
}
.attendee-list ol { margin: 0; padding-left: 20px; }

footer.site {
  margin-top: 40px; padding: 22px 0; border-top: 1px solid var(--line);
  color: var(--muted); font-size: .82rem; text-align: center;
}
footer.site a { color: var(--muted); }