:root {
  color-scheme: light;
  --bg: #eaf2fb;
  --bg-deep: #d7e6f7;
  --surface: rgba(255, 255, 255, 0.94);
  --surface-strong: #f8fbff;
  --text: #102238;
  --muted: #5a6d85;
  --line: rgba(16, 34, 56, 0.12);
  --accent: #1d4ed8;
  --accent-2: #38bdf8;
  --accent-3: #2563eb;
  --danger: #b91c1c;
  --success: #1d4ed8;
  --shadow: 0 20px 50px rgba(16, 34, 56, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --font-body: "Avenir Next", "Segoe UI", "Trebuchet MS", sans-serif;
  --font-display: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(29, 78, 216, 0.14), transparent 34%),
    radial-gradient(circle at top right, rgba(56, 189, 248, 0.14), transparent 28%),
    linear-gradient(180deg, var(--bg), var(--bg-deep));
  color: var(--text);
  font-family: var(--font-body);
}

body {
  min-height: 100vh;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.backdrop {
  position: fixed;
  inset: auto;
  pointer-events: none;
  border-radius: 999px;
  filter: blur(6px);
  opacity: 0.8;
  z-index: 0;
}

.backdrop-a {
  width: 22rem;
  height: 22rem;
  top: -6rem;
  left: -4rem;
  background: rgba(29, 78, 216, 0.12);
}

.backdrop-b {
  width: 18rem;
  height: 18rem;
  right: -4rem;
  bottom: 7rem;
  background: rgba(56, 189, 248, 0.12);
}

.shell {
  position: relative;
  z-index: 1;
  width: min(1450px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.25rem 0 2rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 38rem);
  gap: 1rem;
  align-items: start;
  margin-bottom: 1rem;
}

.eyebrow {
  margin: 0 0 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.75rem;
  color: var(--muted);
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.08;
  font-family: var(--font-display);
}

h1 {
  font-size: clamp(2.2rem, 5vw, 4.2rem);
}

.title-line {
  display: block;
}

.title-code {
  display: inline-block;
  margin-left: 0.35rem;
  font-size: 0.58em;
  letter-spacing: 0;
  opacity: 0.78;
  white-space: nowrap;
}

.title-subtitle {
  display: block;
  margin-top: 0.55rem;
}

.lede {
  max-width: 62ch;
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 1.04rem;
  line-height: 1.6;
}

.hero-card,
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero-card {
  padding: 1.1rem 1.2rem;
  display: grid;
  gap: 0.2rem;
}

.hero-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.hero-card--summary {
  padding-bottom: 1rem;
}

.hero-card__label {
  color: var(--muted);
  font-size: 0.83rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero-card__value {
  margin-top: 0.35rem;
  font-size: 1.15rem;
  font-weight: 700;
}

.hero-card__meta {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.45;
}

.hero-card__divider {
  margin: 0.55rem 0 0.35rem;
  height: 1px;
  background: rgba(16, 34, 56, 0.1);
}

.hero-card__clock {
  margin-top: 0.18rem;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.panel__chips {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.layout {
  display: grid;
  grid-template-columns: 19rem minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.sidebar {
  display: grid;
  gap: 1rem;
}

.workspace {
  display: grid;
  gap: 1rem;
}

.panel {
  padding: 1rem;
}

.panel__header,
.question-card__top,
.footer,
.actions,
.meta-row,
.question-badges,
.results-grid,
.filter-actions {
  display: flex;
  gap: 0.75rem;
}

.panel__header,
.question-card__top,
.footer {
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.panel__header h2 {
  font-size: 1.1rem;
}

.panel-note {
  margin: 0.75rem 0 0;
  color: var(--muted);
  line-height: 1.5;
  font-size: 0.92rem;
}

.topic-filters {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.9rem;
}

.topic-option {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.8rem 0.9rem;
  border-radius: var(--radius-md);
  background: rgba(19, 32, 51, 0.04);
  border: 1px solid rgba(19, 32, 51, 0.08);
  cursor: pointer;
}

.topic-option input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
}

.topic-option strong {
  display: block;
  font-size: 0.95rem;
}

.topic-option span {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
  margin-top: 0.1rem;
}

.number-field {
  display: grid;
  gap: 0.35rem;
  margin-top: 0.9rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.number-field input {
  width: 100%;
  border-radius: 14px;
  border: 1px solid rgba(19, 32, 51, 0.12);
  background: white;
  padding: 0.8rem 0.9rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}

.stats--compact {
  margin-top: 0.85rem;
}

.stat {
  padding: 0.85rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(16, 34, 56, 0.07);
}

.stat span {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
}

.stat strong {
  display: block;
  margin-top: 0.3rem;
  font-size: 1.18rem;
}

.progress-bar {
  margin-top: 1rem;
  height: 0.75rem;
  border-radius: 999px;
  background: rgba(16, 34, 56, 0.08);
  overflow: hidden;
}

.progress-bar__fill {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 180ms ease;
}

.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2rem;
  padding: 0.28rem 0.68rem;
  border-radius: 999px;
  background: rgba(29, 78, 216, 0.12);
  color: #1d4ed8;
  font-size: 0.82rem;
  font-weight: 700;
}

.chip--soft {
  background: rgba(16, 34, 56, 0.06);
  color: var(--muted);
}

.ghost,
.button {
  border: 0;
  border-radius: 999px;
  transition:
    transform 120ms ease,
    box-shadow 120ms ease,
    background 120ms ease;
}

.ghost {
  padding: 0.55rem 0.9rem;
  background: transparent;
  color: var(--muted);
}

.button {
  padding: 0.8rem 1rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  box-shadow: 0 12px 26px rgba(29, 78, 216, 0.22);
}

.button--secondary {
  background: rgba(255, 255, 255, 0.92);
  color: var(--accent);
  border: 1px solid rgba(29, 78, 216, 0.22);
  box-shadow: none;
}

.button--ghost {
  background: rgba(29, 78, 216, 0.08);
  color: var(--accent);
  box-shadow: none;
}

.ghost:hover,
.button:hover {
  transform: translateY(-1px);
}

.question-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.5rem;
  margin-top: 1rem;
}

.nav-item {
  min-height: 2.4rem;
  border-radius: 12px;
  border: 1px solid rgba(16, 34, 56, 0.1);
  background: rgba(255, 255, 255, 0.9);
  color: var(--text);
  font-weight: 700;
}

.nav-item[data-state="answered"] {
  border-color: rgba(29, 78, 216, 0.32);
  background: rgba(29, 78, 216, 0.09);
}

.nav-item[data-state="skipped"] {
  border-color: rgba(56, 189, 248, 0.36);
  background: rgba(56, 189, 248, 0.14);
}

.nav-item[data-active="true"] {
  outline: 2px solid rgba(29, 78, 216, 0.45);
  outline-offset: 2px;
}

.skip-list {
  display: grid;
  gap: 0.5rem;
  margin-top: 1rem;
}

.skip-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(29, 78, 216, 0.18);
  background: rgba(239, 246, 255, 0.9);
}

.skip-item button {
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  border: 1px solid rgba(29, 78, 216, 0.18);
  background: white;
  color: var(--accent);
}

.question-card {
  min-height: 32rem;
}

.question-kicker {
  margin: 0 0 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  font-size: 0.76rem;
}

.question-card h2 {
  font-size: clamp(1.5rem, 2vw, 2.2rem);
}

.meta-row {
  flex-wrap: wrap;
  margin: 0.85rem 0 0.25rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.meta-row .meta-pill {
  padding: 0.28rem 0.6rem;
  border-radius: 999px;
  background: rgba(19, 32, 51, 0.06);
}

.question-media {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.9rem;
  margin-bottom: 1rem;
}

.question-media--compact {
  grid-template-columns: minmax(0, 1fr);
  margin-bottom: 0.75rem;
}

.question-media__item {
  margin: 0;
  padding: 0.75rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(16, 34, 56, 0.08);
}

.question-media__img {
  display: block;
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  border-radius: 16px;
  background: white;
}

.question-media__caption {
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.prose {
  margin-top: 1rem;
  padding: 1rem 1rem 1.1rem;
  border-radius: var(--radius-lg);
  background: var(--surface-strong);
  border: 1px solid rgba(16, 34, 56, 0.08);
  font-size: 1.07rem;
  line-height: 1.7;
}

.choices {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}

.ordering-list {
  display: grid;
  gap: 0.75rem;
}

.ordering-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.9rem;
  align-items: center;
  padding: 0.95rem 1rem;
  border-radius: var(--radius-lg);
  background: white;
  border: 1px solid rgba(19, 32, 51, 0.1);
  box-shadow: 0 8px 22px rgba(19, 32, 51, 0.05);
  cursor: grab;
}

.ordering-item:active {
  cursor: grabbing;
}

.ordering-item.is-dragging {
  opacity: 0.55;
  border-style: dashed;
}

.ordering-item.is-drop-target {
  border-color: rgba(29, 78, 216, 0.55);
  box-shadow: 0 0 0 2px rgba(29, 78, 216, 0.14);
}

.ordering-item__rank {
  width: 2.2rem;
  height: 2.2rem;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: rgba(29, 78, 216, 0.12);
  color: #1d4ed8;
  font-weight: 800;
}

.ordering-item__body {
  min-width: 0;
}

.ordering-item__label {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.1rem;
}

.ordering-item__text {
  line-height: 1.5;
}

.ordering-item__handle {
  color: var(--muted);
  font-size: 1.15rem;
  user-select: none;
}

.choice {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.9rem;
  align-items: start;
  padding: 1rem;
  border-radius: var(--radius-lg);
  background: white;
  border: 1px solid rgba(16, 34, 56, 0.1);
  transition:
    border-color 120ms ease,
    transform 120ms ease,
    box-shadow 120ms ease;
}

.choice:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(19, 32, 51, 0.08);
}

.choice--field {
  grid-template-columns: minmax(0, 1fr) minmax(12rem, 16rem);
  align-items: center;
}

.choice input {
  margin-top: 0.2rem;
}

.choice[data-selected="true"] {
  border-color: rgba(29, 78, 216, 0.45);
  background: rgba(29, 78, 216, 0.06);
}

.choice__label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  margin-right: 0.6rem;
  border-radius: 999px;
  background: rgba(29, 78, 216, 0.08);
  font-weight: 800;
}

.choice__text {
  display: block;
  line-height: 1.55;
}

.choice--field select,
.choice--field input[type="text"] {
  width: 100%;
  min-width: 0;
  padding: 0.82rem 0.9rem;
  border-radius: 14px;
  border: 1px solid rgba(16, 34, 56, 0.12);
  background: white;
  color: var(--text);
}

.answer-hint {
  min-height: 1.5rem;
  margin-top: 0.85rem;
  color: #426487;
  font-size: 0.92rem;
}

.actions {
  flex-wrap: wrap;
  margin-top: 1.2rem;
}

.unsupported {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(185, 28, 28, 0.18);
  background: rgba(254, 242, 242, 0.85);
  color: #7f1d1d;
}

.results-grid {
  flex-wrap: wrap;
  margin-top: 0.85rem;
}

.result-card {
  min-width: 11rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(16, 34, 56, 0.08);
}

.result-card span {
  display: block;
  color: var(--muted);
  font-size: 0.84rem;
}

.result-card strong {
  display: block;
  margin-top: 0.3rem;
  font-size: 1.25rem;
}

.result-note {
  margin-top: 1rem;
  color: var(--muted);
}

.review-list {
  display: grid;
  gap: 0.85rem;
  margin-top: 1rem;
}

.review-item {
  padding: 1rem;
  border-radius: var(--radius-lg);
  background: white;
  border: 1px solid rgba(16, 34, 56, 0.1);
}

.review-item .question-media {
  margin-top: 0.25rem;
  margin-bottom: 0.65rem;
}

.review-item .question-media__img {
  max-height: 240px;
}

.review-item__top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 0.6rem;
}

.review-item__meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.review-item__status {
  font-weight: 800;
}

.review-item__status.is-correct {
  color: var(--success);
}

.review-item__status.is-wrong {
  color: var(--danger);
}

.footer {
  margin: 1rem 0 0.25rem;
  padding: 0.9rem 0.3rem;
  color: var(--muted);
}

.loading {
  display: grid;
  place-items: center;
  min-height: 50vh;
  color: var(--muted);
}

@media (max-width: 1120px) {
  .hero,
  .layout {
    grid-template-columns: 1fr;
  }

  .hero-cards {
    grid-template-columns: 1fr;
  }

  .question-nav {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .shell {
    width: min(100% - 1rem, 1450px);
    padding-top: 0.7rem;
  }

  .hero-card,
  .panel,
  .question-card {
    border-radius: 20px;
  }

  .hero-cards {
    grid-template-columns: 1fr;
  }

  .question-nav {
    grid-template-columns: repeat(auto-fit, minmax(2.8rem, 1fr));
  }

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

  .question-card {
    min-height: 0;
  }

  .question-card__top {
    align-items: flex-start;
  }

  .question-badges {
    width: 100%;
    justify-content: flex-start;
  }

  .choice--field {
    grid-template-columns: 1fr;
  }

  .filter-actions {
    flex-direction: column;
  }

  .actions,
  .footer {
    flex-direction: column;
    align-items: stretch;
  }

  .button,
  .ghost {
    width: 100%;
  }

  .result-card,
  .stat {
    min-width: 0;
  }

  .hero-card__clock {
    font-size: 1.4rem;
  }

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

  .question-media__img {
    max-height: 280px;
  }

  .review-item__top {
    align-items: flex-start;
  }

  .choice,
  .ordering-item,
  .skip-item,
  .review-item {
    padding-left: 0.85rem;
    padding-right: 0.85rem;
  }
}