/* FS1 Computer Science Courses. Layout: a university course catalogue with a sticky course index
   on the left and the selected course's material register on the right. Ported from the reference
   prototype; colours are tokens, light on :root and dark for a dark device or data-theme='dark'. */
:root {
  --paper: #f1f3f6;
  --surface: #ffffff;
  --ink: #151c27;
  --muted: #586273;
  --line: #d8dde5;
  --accent: #0e6b57;
  --accent-ink: #ffffff;
  --accent-soft: #e2f0eb;
  --warn: #a33a2a;
  --c0: #b4532a;
  --c1: #2d69a0;
  --c2: #86680f;
  --c3: #963a6b;
  --c4: #0e6b57;
  --c5: #5b5fb0;
  --f-display: 'Schibsted Grotesk', system-ui, sans-serif;
  --f-body: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --f-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  color-scheme: light;
}
/* Dark: follows the device unless the visitor picked Light or Dark (data-theme, set by theme.js). */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --paper: #0f141b;
    --surface: #161d27;
    --ink: #e5e9ef;
    --muted: #98a2b1;
    --line: #29323f;
    --accent: #4dc2a2;
    --accent-ink: #06231c;
    --accent-soft: #16302a;
    --warn: #f0846f;
    --c0: #e58a62;
    --c1: #79aee0;
    --c2: #d6b455;
    --c3: #dc85b4;
    --c4: #4dc2a2;
    --c5: #a3a7f0;
    color-scheme: dark;
  }
}
:root[data-theme='dark'] {
  --paper: #0f141b;
  --surface: #161d27;
  --ink: #e5e9ef;
  --muted: #98a2b1;
  --line: #29323f;
  --accent: #4dc2a2;
  --accent-ink: #06231c;
  --accent-soft: #16302a;
  --warn: #f0846f;
  --c0: #e58a62;
  --c1: #79aee0;
  --c2: #d6b455;
  --c3: #dc85b4;
  --c4: #4dc2a2;
  --c5: #a3a7f0;
  color-scheme: dark;
}

/* course colour: each element sets --cc from its course's color_index */
.cc0 {
  --cc: var(--c0);
}
.cc1 {
  --cc: var(--c1);
}
.cc2 {
  --cc: var(--c2);
}
.cc3 {
  --cc: var(--c3);
}
.cc4 {
  --cc: var(--c4);
}
.cc5 {
  --cc: var(--c5);
}
.cc-ink {
  --cc: var(--ink);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 15px;
  line-height: 1.55;
  overflow-wrap: anywhere;
}
a {
  color: var(--accent);
}
[hidden] {
  display: none !important;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}
main:focus {
  outline: none;
}
.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.mono {
  font-family: var(--f-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}
.label {
  font-family: var(--f-mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
}
.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;
}
.skip {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 30;
  background: var(--surface);
  color: var(--ink);
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
}
.skip:focus {
  top: 12px;
}

/* header */
header.top {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
header.top .wrap {
  padding-block: 28px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 20px 40px;
  align-items: flex-end;
  justify-content: space-between;
}
.who {
  min-width: 0;
  flex: 1 1 420px;
}
.who .h1 {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(28px, 4.4vw, 44px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 6px 0 8px;
  text-wrap: balance;
}
.who .h1 a {
  color: inherit;
  text-decoration: none;
}
.who .role {
  color: var(--muted);
  margin: 0;
}
.side {
  display: grid;
  gap: 14px;
  justify-items: end;
  min-width: 0;
}
/* light / dark toggle */
.theme-toggle .icon {
  font-size: 13px;
  line-height: 1;
}
.contact {
  justify-self: stretch;
  display: grid;
  gap: 6px;
  justify-items: start;
  min-width: 0;
}
.contact .row {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}
.contact .mono {
  user-select: all;
}

/* buttons */
.btn {
  font: 500 13px var(--f-body);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  border-radius: 6px;
  padding: 6px 11px;
  cursor: pointer;
  display: inline-flex;
  gap: 6px;
  align-items: center;
  text-decoration: none;
  line-height: 1.3;
}
.btn:hover {
  border-color: var(--muted);
}
.btn:disabled {
  opacity: 0.6;
  cursor: progress;
}
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}
.btn.ghost {
  border-color: transparent;
  background: transparent;
  color: var(--muted);
  padding: 4px 7px;
}
.btn.ghost:hover {
  color: var(--ink);
  border-color: var(--line);
}
.btn.danger,
.btn[data-armed] {
  color: var(--warn);
}
.btn[data-armed] {
  border-color: var(--warn);
}
.btn.danger-fill {
  background: var(--warn);
  border-color: var(--warn);
  color: var(--paper);
}
.btn.small {
  font-size: 12px;
  padding: 3px 8px;
}
form.inline {
  display: inline;
  margin: 0;
}

/* edit bar (admin) */
.editbar {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 5;
  background: var(--ink);
  color: var(--paper);
}
.editbar .wrap {
  padding-block: 9px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}
.editbar .btn {
  background: transparent;
  color: var(--paper);
  border-color: color-mix(in srgb, var(--paper) 35%, transparent);
}
.editbar .btn:hover {
  border-color: var(--paper);
}
.editbar .status {
  font-size: 13px;
}
.editbar-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.flash-error::before {
  content: '⚠ ';
}

/* layout */
.layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 40px;
  padding-block: 32px 64px;
}
nav.index {
  position: sticky;
  top: calc(env(safe-area-inset-top, 0px) + 20px);
  align-self: start;
  display: grid;
  gap: 4px;
}
nav.index .label {
  margin: 0 0 6px 10px;
}
nav.index a:not(.btn) {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 7px 10px;
  border-radius: 6px;
  color: var(--ink);
  text-decoration: none;
}
nav.index a:not(.btn):hover {
  background: var(--surface);
}
nav.index a[aria-current='page'] {
  background: var(--surface);
  box-shadow: inset 0 0 0 1px var(--line);
  font-weight: 600;
}
nav.index .dot {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--cc);
  transform: translateY(1px);
}
nav.index small {
  display: block;
  color: var(--muted);
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 400;
}
nav.index .sep {
  height: 1px;
  background: var(--line);
  margin: 10px;
}
nav.index .add-course {
  justify-self: start;
  margin-top: 8px;
}
main {
  min-width: 0;
}

/* overview */
.intro {
  max-width: 64ch;
  font-size: 16.5px;
  margin: 0 0 28px;
  white-space: pre-line;
}
.search {
  display: flex;
  gap: 8px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 8px 8px 12px;
  margin-bottom: 28px;
}
.search:focus-within {
  border-color: var(--accent);
}
.search input {
  border: 0;
  outline: 0;
  background: transparent;
  font: inherit;
  color: var(--ink);
  flex: 1;
  min-width: 0;
}
.search input::placeholder {
  color: var(--muted);
}
#results:not(:empty) {
  margin-bottom: 32px;
}
.results-count {
  margin: 0 0 8px;
}
h2.sec {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 20px;
  margin: 0 0 12px;
  display: flex;
  gap: 10px;
  align-items: baseline;
  flex-wrap: wrap;
}
section + section {
  margin-top: 40px;
}
.ann {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.ann li {
  list-style: none;
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr) auto;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.ann .when {
  color: var(--muted);
}
.ann .text {
  white-space: pre-line;
}
.ann .tag {
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--cc);
  margin-right: 8px;
  text-decoration: none;
  font-weight: 500;
}
.ann .tag:hover {
  text-decoration: underline;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(250px, 100%), 1fr));
  gap: 14px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px 18px 16px;
  text-decoration: none;
  color: var(--ink);
  display: grid;
  gap: 8px;
  align-content: start;
  border-top: 4px solid var(--cc);
}
.card:hover {
  border-color: var(--muted);
  border-top-color: var(--cc);
}
.card h3 {
  font-family: var(--f-display);
  font-size: 19px;
  font-weight: 700;
  margin: 0;
  line-height: 1.2;
}
.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card .foot {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  color: var(--muted);
}
.empty {
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 16px;
  margin: 0;
}
.page-h {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 1.1;
  margin: 0 0 18px;
}
.errpage p {
  max-width: 60ch;
}

/* course page */
.chead {
  border-bottom: 1px solid var(--line);
  padding-bottom: 22px;
  margin-bottom: 26px;
}
.chead .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  color: var(--muted);
}
.chead .meta .code {
  color: var(--cc);
  font-weight: 500;
}
.chead h1 {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 8px 0 12px;
  text-wrap: balance;
}
.chead .desc {
  max-width: 66ch;
  margin: 0 0 14px;
  font-size: 16px;
  white-space: pre-line;
}
.topics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
}
.topics li {
  list-style: none;
  font-size: 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 10px;
  background: var(--surface);
}
.tools {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 14px;
  align-items: center;
}
.cat {
  margin-top: 30px;
  scroll-margin-top: 64px;
}
.cat h2 {
  font-family: var(--f-display);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 6px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}
.cat h2 .fr {
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--muted);
  font-weight: 400;
  letter-spacing: 0.06em;
}
.mats {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.mats li {
  list-style: none;
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 64px;
}
.mats .d {
  color: var(--muted);
}
.mats .body {
  min-width: 0;
}
.mats .t {
  font-weight: 500;
}
.mats .n {
  color: var(--muted);
  font-size: 13.5px;
  margin-top: 2px;
  white-space: pre-line;
}
.mats .src {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--muted);
  margin-left: 6px;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0 4px;
  white-space: nowrap;
}
/* hidden from students (only the signed-in instructor sees these rows) */
.mats li.is-hidden .d,
.mats li.is-hidden .body {
  opacity: 0.55;
}
.mats .hidden-tag {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--warn);
  margin-left: 6px;
  border: 1px dashed var(--warn);
  border-radius: 4px;
  padding: 0 4px;
  white-space: nowrap;
}
.mats .act {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
}
.result-course {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--cc);
  text-decoration: none;
  font-weight: 500;
}
.result-course:hover {
  text-decoration: underline;
}

/* forms: standalone page (no JS) and dialog (JS) share .formcard */
.formpage {
  padding-block: 32px 64px;
}
.formcard {
  background: var(--surface);
  color: var(--ink);
  border-radius: 12px;
  border: 1px solid var(--line);
  width: min(560px, 100%);
  margin: 0 auto;
  padding: 22px;
}
.form-h {
  font-family: var(--f-display);
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 14px;
}
.formcard form {
  display: grid;
  gap: 12px;
}
.formcard label {
  display: grid;
  gap: 4px;
  font-size: 13px;
  font-weight: 500;
}
.formcard input,
.formcard select,
.formcard textarea {
  font: inherit;
  font-weight: 400;
  font-size: 14px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
  width: 100%;
  min-width: 0;
}
.formcard label.check {
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 8px;
}
.formcard label.check > span {
  display: grid;
  gap: 2px;
}
.formcard input[type='checkbox'] {
  width: 16px;
  height: 16px;
  margin: 2px 0 0;
  padding: 0;
  accent-color: var(--accent);
}
.formcard input[type='file'] {
  padding: 6px;
}
.formcard textarea {
  min-height: 84px;
  resize: vertical;
}
.formcard .hint {
  font-weight: 400;
  color: var(--muted);
  font-size: 12.5px;
}
.formcard .two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.formcard .actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 4px;
  flex-wrap: wrap;
}
.formcard .err {
  color: var(--warn);
  font-size: 13px;
  margin: 0;
}
.formcard .err::before {
  content: '⚠ ';
}
.confirm-msg {
  white-space: pre-line;
  margin: 0 0 16px;
}
dialog.modal {
  border: 0;
  padding: 0;
  background: transparent;
  width: min(560px, calc(100% - 32px));
  max-height: calc(100% - 32px);
  overflow: auto;
  color: var(--ink);
}
dialog.modal .formcard {
  width: 100%;
}
dialog.modal::backdrop {
  background: color-mix(in srgb, var(--ink) 45%, transparent);
}

footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
}
footer .wrap {
  padding-block: 18px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
footer a {
  color: var(--muted);
}

@media (max-width: 820px) {
  .side {
    justify-items: start;
  }
  .layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    padding-block: 18px 48px;
  }
  nav.index {
    position: static;
    display: flex;
    overflow-x: auto;
    gap: 6px;
    padding-bottom: 6px;
  }
  nav.index .label,
  nav.index .sep {
    display: none;
  }
  nav.index a:not(.btn) {
    flex: 0 0 auto;
    grid-template-columns: 9px auto;
    background: var(--surface);
    box-shadow: inset 0 0 0 1px var(--line);
  }
  nav.index small {
    display: none;
  }
  nav.index a[aria-current='page'] {
    box-shadow: inset 0 0 0 2px var(--cc);
  }
  nav.index .add-course {
    flex: 0 0 auto;
    margin-top: 0;
  }
  .ann li {
    grid-template-columns: minmax(0, 1fr) auto;
  }
  .ann li .when {
    grid-column: 1 / -1;
  }
  .mats li {
    grid-template-columns: minmax(0, 1fr) auto;
  }
  .mats .d {
    grid-column: 1 / -1;
    font-size: 12px;
  }
  .mats .d:empty {
    display: none;
  }
  .formcard .two {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 420px) {
  .mats li {
    grid-template-columns: minmax(0, 1fr);
  }
  .mats .act {
    justify-content: flex-start;
  }
  .search .btn {
    display: none;
  }
}
@media (prefers-reduced-motion: no-preference) {
  .card,
  .btn,
  nav.index a {
    transition:
      border-color 0.15s,
      background 0.15s;
  }
}