/* ==========================================================================
   TMA4268 deck quiz — Quartz-aligned styling
   Tokens, fonts, and dark mode mirror the wiki so a deck feels like part of
   the same site even though it's a static page outside Quartz's pipeline.
   ========================================================================== */

:root {
  /* Quartz default light-mode palette */
  --light: #faf8f8;
  --lightgray: #e5e5e5;
  --gray: #b8b8b8;
  --darkgray: #4e4e4e;
  --dark: #2b2b2b;
  --secondary: #284b63;
  --tertiary: #84a59d;
  --highlight: rgba(143, 159, 169, 0.15);
  --textHighlight: #fff23688;

  /* Card background, slightly elevated above the page background */
  --card: #ffffff;
  --card-border: #e5e5e5;
  --card-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);

  /* Quartz fonts */
  --headerFont: "Schibsted Grotesk", system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --bodyFont: "Source Sans Pro", system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --codeFont: "IBM Plex Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;

  /* Semantic colors (correct / wrong) — Quartz doesn't define these; tuned to harmonise */
  --correct-bg: #ecfdf5;
  --correct-border: #10b981;
  --correct-fg: #047857;
  --wrong-bg: #fef2f2;
  --wrong-border: #ef4444;
  --wrong-fg: #b91c1c;
}

:root[saved-theme="dark"] {
  --light: #161618;
  --lightgray: #393639;
  --gray: #646464;
  --darkgray: #d4d4d4;
  --dark: #ebebec;
  --secondary: #7b97aa;
  --tertiary: #84a59d;
  --highlight: rgba(143, 159, 169, 0.15);
  --textHighlight: #b3aa0288;

  --card: #1c1c1f;
  --card-border: #393639;
  --card-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);

  --correct-bg: rgba(16, 185, 129, 0.12);
  --correct-border: #10b981;
  --correct-fg: #34d399;
  --wrong-bg: rgba(239, 68, 68, 0.12);
  --wrong-border: #ef4444;
  --wrong-fg: #f87171;
}

/* --- Page chrome --- */

html {
  background: var(--light);
}

body {
  margin: 0;
  background: var(--light);
  color: var(--dark);
  font-family: var(--bodyFont);
  font-size: 18px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.exam-shell {
  max-width: 880px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 6rem;
}

.exam-head {
  border-bottom: 1px solid var(--lightgray);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.exam-head h1 {
  margin: 0 0 0.4rem;
  font-family: var(--headerFont);
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--dark);
}

.exam-head .meta {
  color: var(--darkgray);
  font-size: 0.95rem;
  margin: 0.3rem 0;
  font-family: var(--bodyFont);
}

.exam-head .back-link {
  display: inline-block;
  margin-bottom: 0.85rem;
  color: var(--secondary);
  text-decoration: none;
  font-size: 0.92rem;
}

.exam-head .back-link:hover {
  text-decoration: underline;
}

.exam-part {
  margin: 2.5rem 0 1.5rem;
}

.exam-part h2 {
  font-family: var(--headerFont);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
  border-bottom: 2px solid var(--secondary);
  padding-bottom: 0.4rem;
  display: inline-block;
  color: var(--dark);
}

.exam-part .part-desc {
  color: var(--darkgray);
  margin: 0.4rem 0 1.2rem;
  font-style: italic;
}

/* --- Question card --- */

.exam-q {
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 1.5rem 1.75rem;
  margin: 1.75rem 0;
  background: var(--card);
  box-shadow: var(--card-shadow);
}

.exam-q__head {
  display: flex;
  gap: 0.85rem;
  align-items: baseline;
  margin-bottom: 0.85rem;
  font-size: 0.95rem;
  color: var(--darkgray);
  font-family: var(--bodyFont);
  flex-wrap: wrap;
}

.exam-q__num {
  font-weight: 600;
  color: var(--dark);
}

.exam-q__points {
  color: var(--gray);
}

/* Source-provenance flag (ISLP §X Qn / Exam YYYY Pn / CEn Pm / Ex<i>.<j>).
   Inert: parser ignores it. Pushed to the right of the header via margin-left:auto
   on the flex container. Says where the question came from — NOT what concept it
   tests, so it doesn't leak the answer space. See deck.md §3.5. */
.exam-q__src {
  margin-left: auto;
  font-family: var(--bodyFont);
  font-size: 0.78rem;
  color: var(--darkgray);
  background: var(--highlight);
  border: 1px solid var(--lightgray);
  border-radius: 4px;
  padding: 0.1rem 0.45rem;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.q-text {
  margin: 0 0 1.1rem;
  line-height: 1.6;
  color: var(--dark);
}

.q-text code,
.fasit-body code,
code {
  background: var(--highlight);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.92em;
  font-family: var(--codeFont);
  color: var(--dark);
}

.q-table {
  border-collapse: collapse;
  margin: 0.9rem 0 1.1rem;
  font-family: var(--codeFont);
  font-size: 0.9rem;
}

.q-table th,
.q-table td {
  border: 1px solid var(--lightgray);
  padding: 5px 13px;
  text-align: left;
}

.q-table th {
  background: var(--highlight);
  font-weight: 600;
  color: var(--dark);
}

.q-code {
  font-family: var(--codeFont);
  background: var(--highlight);
  border: 1px solid var(--lightgray);
  border-radius: 5px;
  padding: 0.7rem 1rem;
  margin: 0.7rem 0 1.1rem;
  white-space: pre;
  overflow-x: auto;
  font-size: 0.88rem;
  color: var(--dark);
}

/* --- Option list --- */

.exam-q__opts {
  list-style: none;
  padding: 0;
  margin: 0 0 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.exam-q__opts > li {
  border: 1px solid var(--lightgray);
  border-radius: 6px;
  padding: 0.7rem 0.9rem 0.7rem 2.7rem;
  position: relative;
  transition: background-color 120ms, border-color 120ms;
  color: var(--dark);
}

.opt-label {
  position: absolute;
  left: 0.9rem;
  top: 0.7rem;
  font-weight: 700;
  color: var(--secondary);
  min-width: 1.25rem;
  font-family: var(--headerFont);
}

.exam-q__opts.is-quiz > li.is-clickable {
  cursor: pointer;
}

.exam-q__opts.is-quiz > li.is-clickable:hover {
  background: var(--highlight);
  border-color: var(--secondary);
}

.exam-q__opts.is-quiz > li.is-clickable:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

.exam-q__opts.is-answered > li {
  cursor: default;
}

.exam-q__opts > li.is-correct {
  background: var(--correct-bg);
  border-color: var(--correct-border);
}

.exam-q__opts > li.is-correct .opt-label {
  color: var(--correct-fg);
}

.exam-q__opts > li.is-correct::after {
  content: "✓";
  position: absolute;
  right: 0.9rem;
  top: 0.7rem;
  color: var(--correct-fg);
  font-weight: 700;
}

.exam-q__opts > li.is-wrong {
  background: var(--wrong-bg);
  border-color: var(--wrong-border);
}

.exam-q__opts > li.is-wrong .opt-label {
  color: var(--wrong-fg);
}

.exam-q__opts > li.is-wrong::after {
  content: "✗";
  position: absolute;
  right: 0.9rem;
  top: 0.7rem;
  color: var(--wrong-fg);
  font-weight: 700;
}

/* --- True/false sub-fields --- */

.exam-q__tf {
  list-style: none;
  padding: 0;
  margin: 0 0 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.exam-q__tf-field {
  border: 1px solid var(--lightgray);
  border-radius: 6px;
  padding: 0.6rem 0.9rem;
  display: flex;
  gap: 0.9rem;
  align-items: center;
  flex-wrap: wrap;
  background: var(--card);
}

.exam-q__tf-field .tf-stmt {
  flex: 1;
  min-width: 0;
  color: var(--dark);
}

.exam-q__tf-field label {
  font-size: 0.92rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--darkgray);
}

.exam-q__tf-field input[type="radio"] {
  accent-color: var(--secondary);
}

.exam-q__tf-field.is-correct {
  background: var(--correct-bg);
  border-color: var(--correct-border);
}

.exam-q__tf-field.is-wrong {
  background: var(--wrong-bg);
  border-color: var(--wrong-border);
}

.exam-q__tf-status {
  margin-left: auto;
  font-weight: 600;
}

.exam-q__tf-field.is-correct .exam-q__tf-status {
  color: var(--correct-fg);
}

.exam-q__tf-field.is-wrong .exam-q__tf-status {
  color: var(--wrong-fg);
}

/* --- Cloze (fill-in-the-blank paragraph) --- */

.exam-q__cloze {
  margin: 0 0 1.1rem;
}

.exam-q__cloze p {
  margin: 0 0 0.9rem;
  line-height: 1.75;
  color: var(--dark);
}

.cloze-blank {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  display: inline-block;
  vertical-align: baseline;
  font: inherit;
  font-size: 0.9em;
  line-height: 1.1;
  height: 1.5em;
  color: var(--secondary);
  background-color: var(--highlight);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path d='M1 1l4 4 4-4' fill='none' stroke='%23284b63' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat: no-repeat;
  background-position: right 7px center;
  border: 1px solid var(--secondary);
  border-radius: 4px;
  padding: 0 20px 0 7px;
  margin: 0 1px;
  cursor: pointer;
  max-width: 100%;
  transition: background-color 120ms, border-color 120ms;
}

.cloze-blank:hover {
  background-color: var(--card);
}

.cloze-blank:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

:root[saved-theme="dark"] .cloze-blank {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path d='M1 1l4 4 4-4' fill='none' stroke='%237b97aa' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/></svg>");
}

.cloze-blank.is-filled {
  color: var(--dark);
}

.cloze-blank:disabled {
  opacity: 1;
  cursor: default;
}

.cloze-blank.is-correct {
  background-color: var(--correct-bg);
  border-color: var(--correct-border);
  color: var(--correct-fg);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='10' viewBox='0 0 12 10'><path d='M1 5l3.5 3.5L11 1.5' fill='none' stroke='%23047857' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-position: right 7px center;
}

:root[saved-theme="dark"] .cloze-blank.is-correct {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='10' viewBox='0 0 12 10'><path d='M1 5l3.5 3.5L11 1.5' fill='none' stroke='%2334d399' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/></svg>");
}

.cloze-blank.is-wrong {
  background-color: var(--wrong-bg);
  border-color: var(--wrong-border);
  color: var(--wrong-fg);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10'><path d='M1 1l8 8M9 1l-8 8' fill='none' stroke='%23b91c1c' stroke-width='1.7' stroke-linecap='round'/></svg>");
  background-position: right 7px center;
}

:root[saved-theme="dark"] .cloze-blank.is-wrong {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 10 10'><path d='M1 1l8 8M9 1l-8 8' fill='none' stroke='%23f87171' stroke-width='1.7' stroke-linecap='round'/></svg>");
}

.cloze-correction {
  display: inline-block;
  vertical-align: baseline;
  height: 1.5em;
  line-height: 1.5em;
  margin: 0 1px 0 4px;
  padding: 0 8px;
  border-radius: 4px;
  background: var(--correct-bg);
  color: var(--correct-fg);
  border: 1px solid var(--correct-border);
  font-size: 0.9em;
  font-weight: 600;
  white-space: normal;
  text-decoration: none;
}

.cloze-correction::before {
  content: "→ ";
  opacity: 0.7;
  font-weight: 400;
}

.cloze-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-top: 0.6rem;
  flex-wrap: wrap;
}

.cloze-check {
  font-family: var(--bodyFont);
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  background: var(--secondary);
  border: 1px solid var(--secondary);
  border-radius: 6px;
  padding: 0.55rem 1.1rem;
  cursor: pointer;
  transition: filter 120ms, transform 120ms;
}

.cloze-check:hover:not(:disabled) {
  filter: brightness(1.08);
}

.cloze-check:active:not(:disabled) {
  transform: translateY(1px);
}

.cloze-check:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

.cloze-check:disabled {
  opacity: 0.55;
  cursor: default;
}

.cloze-progress {
  font-size: 0.88rem;
  color: var(--darkgray);
  font-family: var(--bodyFont);
}

.cloze-progress.is-complete {
  color: var(--correct-fg);
  font-weight: 600;
}

/* --- Explanation block --- */

.fasit-details {
  border-top: 1px dashed var(--lightgray);
  padding-top: 0.9rem;
  margin-top: 0.7rem;
}

.fasit-details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--secondary);
  font-family: var(--headerFont);
}

.fasit-correct {
  display: inline-block;
  font-weight: 700;
  color: var(--correct-fg);
  margin-bottom: 0.6rem;
  font-family: var(--headerFont);
}

.fasit-body {
  color: var(--dark);
}

.fasit-body p {
  margin: 0.55rem 0;
  line-height: 1.6;
}

.fasit-body ol,
.fasit-body ul {
  margin: 0.55rem 0;
  padding-left: 1.5rem;
}

.fasit-body li {
  margin: 0.3rem 0;
}

.fasit-body strong {
  color: var(--dark);
}

.fasit-body .ref {
  font-size: 0.92rem;
  color: var(--darkgray);
  margin-top: 0.85rem;
}

.fasit-body a {
  color: var(--secondary);
  text-decoration: none;
}

.fasit-body a:hover {
  text-decoration: underline;
}

/* --- Score tracker: FAB + collapsible panel --- */

.exam-tracker {
  position: fixed;
  bottom: 1.25rem;
  left: 1.25rem;
  z-index: 9998;
  width: 56px;
  height: 56px;
  font-family: var(--bodyFont);
  font-size: 0.9rem;
  color: var(--dark);
  user-select: none;
  pointer-events: none;
}

.exam-tracker__fab,
.exam-tracker__panel {
  pointer-events: auto;
}

.exam-tracker__fab {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 2px solid var(--card);
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.16);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
  line-height: 1.05;
  padding: 0;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  color: #fff;
  font-family: var(--bodyFont);
  background: var(--secondary);
}

.exam-tracker__fab:hover {
  transform: scale(1.06);
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.2);
}

.exam-tracker__fab:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 3px;
}

.exam-tracker__fab-pct {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.exam-tracker__fab-frac {
  font-size: 0.6rem;
  font-weight: 600;
  opacity: 0.92;
  margin-top: 2px;
}

.exam-tracker__panel {
  position: absolute;
  left: 0;
  bottom: calc(56px + 0.75rem);
  width: 248px;
  padding: 0.75rem 0.9rem 0.85rem;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.10);
  color: var(--dark);
}

.exam-tracker.is-collapsed .exam-tracker__panel {
  display: none;
}

.exam-tracker__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--lightgray);
}

.exam-tracker__title {
  font-size: 0.85rem;
  color: var(--darkgray);
  font-weight: 600;
  font-family: var(--bodyFont);
}

.exam-tracker__close {
  width: 28px;
  height: 28px;
  padding: 0;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--darkgray);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
}

.exam-tracker__close:hover {
  background: var(--highlight);
  color: var(--dark);
}

.exam-tracker__close:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 2px;
}

.exam-tracker__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.6rem;
  margin: 0.3rem 0;
}

.exam-tracker__label {
  color: var(--darkgray);
  font-size: 0.88rem;
  font-weight: 500;
  font-family: var(--bodyFont);
}

.exam-tracker__score {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--dark);
}

.exam-tracker__earned {
  color: var(--correct-fg);
}

.exam-tracker__sep {
  color: var(--gray);
  margin: 0 0.15rem;
}

.exam-tracker__pct {
  font-weight: 700;
  color: var(--secondary);
}

.exam-tracker__bar {
  margin: 0.55rem 0 0.3rem;
  height: 5px;
  background: var(--lightgray);
  border-radius: 999px;
  overflow: hidden;
}

.exam-tracker__bar-fill {
  height: 100%;
  width: 0%;
  background: var(--correct-border);
  transition: width 220ms ease;
}

.exam-tracker__sub {
  font-size: 0.85rem;
  color: var(--darkgray);
  font-family: var(--bodyFont);
}

.exam-tracker.is-complete .exam-tracker__panel {
  border-color: var(--correct-border);
  box-shadow: 0 4px 18px rgba(16, 185, 129, 0.18);
}

.exam-tracker.is-complete .exam-tracker__fab {
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.35);
}

@media (max-width: 720px) {
  .exam-shell {
    padding: 1.5rem 1rem 6rem;
  }

  .exam-head h1 {
    font-size: 1.85rem;
  }

  .exam-tracker {
    bottom: 0.75rem;
    left: 0.75rem;
  }

  .exam-tracker__panel {
    width: calc(100vw - 1.5rem);
    max-width: 260px;
    bottom: calc(56px + 0.5rem);
  }

  .exam-tracker__score {
    font-size: 0.95rem;
  }
}