:root {
  --ink: #17233c;
  --ink-soft: #536078;
  --paper: #f6f8fc;
  --card: #ffffff;
  --line: #dbe2ee;
  --gold: #f2c15f;
  --gold-deep: #9a6712;
  --course-2: #3f51a3;
  --course-2-soft: #eef0ff;
  --course-3: #8d3549;
  --course-3-soft: #fff0f3;
  --shadow: 0 15px 42px rgba(23, 35, 60, 0.08);
  --page-gutter: clamp(1rem, 2.5vw, 3rem);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 1rem;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(23, 35, 60, 0.025) 1px, transparent 1px),
    var(--paper);
  background-size: 100% 28px;
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.55;
}

button,
input {
  font: inherit;
}

button,
a,
summary {
  -webkit-tap-highlight-color: transparent;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.7rem 1rem;
  color: white;
  background: var(--ink);
  border-radius: 0.5rem;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.masthead {
  color: white;
  background: var(--ink);
  border-bottom: 2px solid var(--gold);
}

.masthead__inner,
.finder__inner,
.content-shell,
footer p {
  width: 100%;
  margin-inline: 0;
  padding-inline: var(--page-gutter);
}

.masthead__inner {
  padding-block: 0.55rem;
}

.masthead__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.masthead__title {
  display: flex;
  align-items: center;
  min-width: 0;
}

.home-link {
  flex: 0 0 auto;
  margin-right: 0.7rem;
  padding-right: 0.7rem;
  color: #dfe5f0;
  border-right: 1px solid rgba(255, 255, 255, 0.25);
  font-size: 0.78rem;
  font-weight: 700;
  text-decoration: none;
}

.home-link:hover,
.home-link:focus-visible {
  color: var(--gold);
}

h1,
h2,
.question-title {
  font-family: Georgia, "Times New Roman", serif;
}

h1 {
  margin: 0;
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.summary {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  white-space: nowrap;
}

.summary strong {
  color: var(--gold);
  font-size: 0.9rem;
  line-height: inherit;
}

.summary span {
  color: #dfe5f0;
  font-size: 0.72rem;
}

.finder {
  position: relative;
  background: rgba(246, 248, 252, 0.96);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 8px 24px rgba(23, 35, 60, 0.06);
  backdrop-filter: blur(16px);
}

.finder__inner {
  padding-block: 0.85rem 0.75rem;
}

.search {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  min-height: 3.25rem;
  padding: 0 1rem;
  background: var(--card);
  border: 1px solid #cbd5e5;
  border-radius: 0.85rem;
  box-shadow: 0 6px 18px rgba(23, 35, 60, 0.05);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.search:focus-within {
  border-color: var(--course-2);
  box-shadow: 0 0 0 4px rgba(63, 81, 163, 0.12);
}

.search svg {
  width: 1.2rem;
  flex: 0 0 auto;
  fill: none;
  stroke: var(--ink-soft);
  stroke-linecap: round;
  stroke-width: 1.8;
}

.search input {
  width: 100%;
  min-width: 0;
  padding: 0.8rem 0;
  color: var(--ink);
  background: transparent;
  border: 0;
  outline: 0;
  font-size: 1rem;
}

.search input::placeholder {
  color: #778299;
}

kbd {
  padding: 0.12rem 0.45rem;
  color: var(--ink-soft);
  background: #eef1f6;
  border: 1px solid #d3dae6;
  border-radius: 0.35rem;
  font-size: 0.78rem;
}

.quick-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 2.45rem;
  margin-top: 0.55rem;
}

.course-jumps {
  display: flex;
  gap: 0.45rem;
}

.course-jumps button,
.reset-button,
.tag-cloud button,
.empty-state button {
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.course-jumps button {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.7rem;
  color: var(--ink);
  background: white;
  font-size: 0.82rem;
  font-weight: 700;
}

.course-jumps button span {
  color: var(--ink-soft);
  font-weight: 500;
}

.course-jumps button[aria-pressed="true"] {
  color: white;
}

.course-jumps button[data-course-toggle="2"][aria-pressed="true"] {
  background: var(--course-2);
  border-color: var(--course-2);
}

.course-jumps button[data-course-toggle="3"][aria-pressed="true"] {
  background: var(--course-3);
  border-color: var(--course-3);
}

.course-jumps button[aria-pressed="true"] span {
  color: rgba(255, 255, 255, 0.78);
}

.course-jumps button[aria-pressed="false"] {
  color: #68748a;
  background: #eef1f6;
  border-color: #d6dce7;
}

.course-jumps button:hover,
.course-jumps button:focus-visible,
.tag-cloud button:hover,
.tag-cloud button:focus-visible {
  border-color: #8a96aa;
  transform: translateY(-1px);
}

.reset-button {
  padding: 0.38rem 0.75rem;
  color: #7a2438;
  background: var(--course-3-soft);
  border-color: #e9b6c2;
  font-size: 0.8rem;
  font-weight: 700;
}

.result-count {
  margin: 0 0 0 auto;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.tag-block {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.25rem 0 0.1rem;
}

.tag-cloud {
  display: block;
  flex: 1;
  min-width: 0;
  column-count: 2;
  column-gap: 0.8rem;
}

.filter-group {
  display: inline-block;
  width: 100%;
  min-width: 0;
  margin: 0 0 0.8rem;
  padding: 0.65rem 0.75rem 0.75rem;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
  border-left: 3px solid #aeb9cc;
  border-radius: 0.8rem;
  break-inside: avoid;
}

.filter-group h3 {
  margin: 0 0 0.3rem;
  color: var(--ink-soft);
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-transform: uppercase;
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.32rem;
}

.tag-cloud button {
  padding: 0.3rem 0.62rem;
  color: #3e4b64;
  background: transparent;
  font-size: 0.85rem;
  line-height: 1.25;
}

.tag-cloud button[aria-pressed="true"] {
  color: white;
  background: var(--ink);
  border-color: var(--ink);
}

.content-shell {
  padding-top: 2.6rem;
  padding-bottom: calc(100vh + 4rem);
  padding-bottom: calc(100svh + 4rem);
}

.course-section + .course-section {
  margin-top: 4.5rem;
}

.course-heading {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.1rem;
}

.course-kicker {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  color: white;
  background: var(--course-color);
  border-radius: 0.7rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.5rem;
}

.course-heading h2 {
  margin: 0;
  font-size: clamp(1.65rem, 4vw, 2.3rem);
  font-weight: 500;
  letter-spacing: -0.025em;
}

.course-heading p {
  margin: 0.15rem 0 0;
  color: var(--ink-soft);
  font-size: 0.86rem;
}

.course-visible-count {
  color: var(--course-color);
  font-size: 0.8rem;
  font-weight: 800;
}

.question-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr));
  align-items: start;
  gap: 0.75rem;
}

.question-card {
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  box-shadow: 0 3px 12px rgba(23, 35, 60, 0.035);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.question-card:hover {
  border-color: color-mix(in srgb, var(--course-color), white 52%);
  box-shadow: 0 9px 24px rgba(23, 35, 60, 0.08);
  transform: translateY(-1px);
}

.question-card[open] {
  grid-column: span 2;
  border-color: color-mix(in srgb, var(--course-color), white 45%);
  box-shadow: var(--shadow);
}

.question-card summary {
  display: grid;
  grid-template-columns: 2.15rem 1fr 1.2rem;
  gap: 0.75rem;
  align-items: start;
  min-height: 6.2rem;
  padding: 0.9rem;
  cursor: pointer;
  list-style: none;
}

.question-card summary::-webkit-details-marker {
  display: none;
}

.question-card summary:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--course-color), white 55%);
  outline-offset: -3px;
}

.question-number {
  display: grid;
  place-items: center;
  width: 2.15rem;
  height: 2.15rem;
  color: var(--course-color);
  background: var(--course-soft);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 800;
}

.question-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.35;
}

.question-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 0.65rem;
}

.question-tags span {
  color: var(--ink-soft);
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
}

.chevron {
  width: 1rem;
  height: 1rem;
  margin-top: 0.3rem;
  border-right: 2px solid var(--course-color);
  border-bottom: 2px solid var(--course-color);
  transform: rotate(45deg);
  transition: transform 160ms ease;
}

.question-card[open] .chevron {
  transform: translateY(0.35rem) rotate(225deg);
}

.answer {
  margin: 0 0.95rem 0.95rem 3.8rem;
  padding: 1rem 1.1rem 1.1rem;
  background: var(--course-soft);
  border-left: 3px solid var(--course-color);
  border-radius: 0.35rem 0.65rem 0.65rem 0.35rem;
}

.answer p {
  margin: 0;
  color: #29364d;
}

.answer p + p {
  margin-top: 0.75rem;
}

.answer .takeaway {
  margin: 0 0 0.95rem;
  padding: 0.8rem 0.9rem;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid color-mix(in srgb, var(--course-color), white 68%);
  border-left: 4px solid var(--course-color);
  border-radius: 0.5rem;
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.45;
}

.takeaway strong {
  color: var(--course-color);
  font-weight: 800;
}

.answer .takeaway + p {
  margin-top: 0;
}

.match-note {
  display: inline-block;
  margin-top: 0.6rem;
  color: var(--gold-deep);
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
}

mark {
  color: inherit;
  background: #ffe3a4;
  border-radius: 0.15em;
}

.empty-state {
  padding: 4rem 1rem;
  text-align: center;
  background: white;
  border: 1px dashed #a9b3c5;
  border-radius: 1rem;
}

.empty-state p {
  margin: 0 0 1rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.3rem;
}

.empty-state button {
  padding: 0.6rem 1rem;
  color: white;
  background: var(--ink);
}

footer {
  color: #cdd5e3;
  background: var(--ink);
}

footer p {
  padding-block: 1.4rem;
  font-size: 0.84rem;
}

[hidden] {
  display: none !important;
}

@media (max-width: 880px) {
  .question-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .question-card[open] {
    grid-column: 1 / -1;
  }
}

@media (max-width: 620px) {
  .home-link {
    max-width: 5.4rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .tag-cloud {
    column-count: 1;
  }

  .summary span {
    display: none;
  }

  .finder__inner {
    padding-top: 0.65rem;
  }

  kbd {
    display: none;
  }

  .quick-row {
    flex-wrap: wrap;
  }

  .result-count {
    order: 3;
    width: 100%;
    margin-left: 0;
  }

  .tag-block {
    margin-top: 0.15rem;
  }

  .content-shell {
    padding-top: 1.7rem;
  }

  .course-heading {
    grid-template-columns: auto 1fr;
  }

  .course-visible-count {
    grid-column: 2;
  }

  .question-grid {
    grid-template-columns: 1fr;
  }

  .question-card[open] {
    grid-column: auto;
  }

  .question-card summary {
    min-height: auto;
  }

  .answer {
    margin-left: 0.95rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}