:root {
  color-scheme: light;
  --bg-cream: #f7f2ea;
  --bg-sand: #f1e6d8;
  --ink: #18202a;
  --ink-muted: #516070;
  --surface: #fffefb;
  --surface-strong: #fff8f0;
  --line: #d8cab9;
  --accent: #df5f3d;
  --accent-strong: #bb3f1f;
  --accent-alt: #2d8f84;
  --correct: #1f8f58;
  --wrong: #b53939;
  --code-bg: #131a24;
  --code-line: #324155;
  --shadow: 0 14px 45px rgba(24, 32, 42, 0.12);
}

body[data-theme="dark"] {
  color-scheme: dark;
  --bg-cream: #0f131a;
  --bg-sand: #1a202b;
  --ink: #edf3ff;
  --ink-muted: #b0bdcf;
  --surface: #171d28;
  --surface-strong: #1d2431;
  --line: #334053;
  --accent: #f08a4a;
  --accent-strong: #cb5b26;
  --accent-alt: #4cb9ab;
  --correct: #49d08d;
  --wrong: #f07676;
  --code-bg: #0d121b;
  --code-line: #2f3c52;
  --shadow: 0 14px 45px rgba(0, 0, 0, 0.42);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 10%, #f7dcb7 0%, rgba(247, 220, 183, 0) 32%),
    radial-gradient(circle at 85% 15%, #cde8e2 0%, rgba(205, 232, 226, 0) 30%),
    linear-gradient(160deg, var(--bg-cream), var(--bg-sand));
  position: relative;
  overflow-x: hidden;
  transition: background 180ms ease, color 180ms ease;
}

body[data-theme="dark"] {
  background:
    radial-gradient(circle at 15% 10%, #2e2a3f 0%, rgba(46, 42, 63, 0) 36%),
    radial-gradient(circle at 85% 15%, #1c3f4a 0%, rgba(28, 63, 74, 0) 34%),
    linear-gradient(160deg, var(--bg-cream), var(--bg-sand));
}

.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(42px);
  opacity: 0.35;
  pointer-events: none;
  z-index: 0;
}

.orb-1 {
  width: 420px;
  height: 420px;
  background: #efa879;
  left: -130px;
  top: -100px;
}

.orb-2 {
  width: 360px;
  height: 360px;
  background: #67b9a8;
  right: -120px;
  top: 200px;
}

body[data-theme="dark"] .orb-1 {
  background: #613a59;
}

body[data-theme="dark"] .orb-2 {
  background: #1f6d6d;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(24, 32, 42, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(24, 32, 42, 0.04) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(circle at center, black 28%, transparent 100%);
}

body[data-theme="dark"] .bg-grid {
  background-image:
    linear-gradient(rgba(215, 223, 236, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(215, 223, 236, 0.06) 1px, transparent 1px);
}

.app-shell {
  max-width: 980px;
  margin: 0 auto;
  padding: 40px 20px 60px;
  position: relative;
  z-index: 1;
}

body.quiz-focus-mode .app-shell {
  max-width: 900px;
  padding-top: 20px;
}

body.summary-focus-mode .app-shell {
  max-width: 900px;
  padding-top: 20px;
}

body.quiz-focus-mode .app-header,
body.quiz-focus-mode .control-panel,
body.quiz-focus-mode .summary {
  display: none !important;
}

body.quiz-focus-mode .quiz-section {
  margin-top: 0;
}

body.summary-focus-mode .app-header,
body.summary-focus-mode .control-panel,
body.summary-focus-mode .quiz-section {
  display: none !important;
}

body.summary-focus-mode .summary {
  margin-top: 0;
}

.app-header {
  margin-bottom: 22px;
  animation: rise-in 600ms ease both;
}

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

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.74rem;
  color: var(--accent-alt);
  margin: 0;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  margin-top: 6px;
}

.subtitle {
  margin: 10px 0 0;
  color: var(--ink-muted);
  max-width: 68ch;
}

.theme-toggle {
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.46));
  color: var(--ink);
  border-radius: 999px;
  padding: 8px 14px;
  font: 600 0.85rem/1 "Space Grotesk", "Segoe UI", sans-serif;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 150ms ease, border-color 150ms ease, background-color 150ms ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}

body[data-theme="dark"] .theme-toggle {
  background: linear-gradient(145deg, rgba(23, 29, 40, 0.9), rgba(30, 38, 52, 0.86));
}

.card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--surface), var(--surface-strong));
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.control-panel {
  animation: rise-in 720ms ease both;
}

.control-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  align-items: start;
}

.week-field {
  grid-column: 1;
  min-width: 0;
}

.setup-side {
  display: grid;
  grid-template-columns: minmax(180px, 1.25fr) minmax(140px, 1fr) repeat(2, minmax(150px, 1fr)) minmax(170px, 1fr);
  gap: 12px;
  align-items: end;
  min-width: 0;
}

.setup-side > * {
  min-width: 0;
}

.setup-side > .field {
  height: 100%;
}

.setup-side > .btn {
  min-height: 54px;
}

.week-selector {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 9px;
  background: #fffcf8;
  display: grid;
  gap: 8px;
}

body[data-theme="dark"] .week-selector {
  background: #101722;
}

.week-checklist {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: 6px;
}

.week-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 9px;
  font-size: 0.82rem;
  color: var(--ink);
  background: #fff;
}

.week-chip input {
  accent-color: var(--accent);
  width: 14px;
  height: 14px;
  margin: 0;
}

.all-chip {
  background: #f8eee2;
  font-weight: 700;
}

body[data-theme="dark"] .week-chip {
  background: #162130;
}

body[data-theme="dark"] .all-chip {
  background: #1f2f46;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.field span {
  font-size: 0.9rem;
  color: var(--ink-muted);
}

select,
input[type="number"] {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  font: inherit;
  color: var(--ink);
  background: #fffcf8;
}

select option:disabled {
  color: #8a97a7;
}

body[data-theme="dark"] select,
body[data-theme="dark"] input[type="number"] {
  background: #101722;
}

.section-switch {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 4px;
  background: #fffcf8;
  min-height: 54px;
}

body[data-theme="dark"] .section-switch {
  background: #101722;
}

.section-chip {
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--ink-muted);
  font: 600 0.86rem/1 "Space Grotesk", "Segoe UI", sans-serif;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color 150ms ease, color 150ms ease, transform 150ms ease;
}

.section-chip:hover {
  transform: translateY(-1px);
}

.section-chip.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
}

.toggle-field {
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  border: 1px dashed var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  min-height: 54px;
}

.toggle-field span {
  line-height: 1.18;
}

.toggle-field input {
  accent-color: var(--accent);
  width: 18px;
  height: 18px;
}

.btn {
  border: 0;
  border-radius: 13px;
  padding: 11px 16px;
  font: 600 0.95rem/1 "Space Grotesk", "Segoe UI", sans-serif;
  cursor: pointer;
  transition: transform 150ms ease, box-shadow 150ms ease, background-color 150ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  box-shadow: 0 9px 18px rgba(191, 63, 31, 0.28);
}

.btn.secondary {
  background: #e8f2ef;
  color: #0f4f48;
}

body[data-theme="dark"] .btn.secondary {
  background: #1f3140;
  color: #d8f5ef;
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  transform: none;
}

.dataset-meta {
  margin: 12px 0 0;
  color: var(--ink-muted);
  font-size: 0.92rem;
}

.hidden {
  display: none !important;
}

.quiz-section {
  margin-top: 18px;
  display: grid;
  gap: 14px;
}

.quiz-top {
  animation: rise-in 260ms ease both;
}

.progress-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
  font-size: 0.95rem;
  color: var(--ink-muted);
}

.progress-main {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hint-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: linear-gradient(140deg, #fff8f1, #f0e2cf);
  color: var(--ink);
  font: 700 0.9rem/1 "Space Grotesk", "Segoe UI", sans-serif;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.hint-btn:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(223, 95, 61, 0.24);
}

.hint-btn:focus-visible,
.modal-close:focus-visible {
  outline: 2px solid var(--accent-alt);
  outline-offset: 2px;
}

body[data-theme="dark"] .hint-btn {
  background: linear-gradient(140deg, #202a39, #182331);
}

.progress-track {
  background: #f1ded0;
  border-radius: 999px;
  overflow: hidden;
  height: 10px;
}

body[data-theme="dark"] .progress-track {
  background: #2a3444;
}

.progress-bar {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #f39d3f, var(--accent-alt));
  transition: width 280ms ease;
}

.question-card {
  display: grid;
  gap: 14px;
  animation: rise-in 300ms ease both;
}

.block-container {
  display: grid;
  gap: 10px;
}

.block-container p {
  margin: 0;
  line-height: 1.55;
}

#questionBody p {
  white-space: pre-line;
}

pre {
  margin: 0;
  border-radius: 14px;
  border: 1px solid var(--code-line);
  background: var(--code-bg);
  color: #e7f0ff;
  padding: 12px;
  overflow: auto;
  font: 500 0.88rem/1.45 "IBM Plex Mono", "Cascadia Mono", monospace;
}

.image-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.image-strip img {
  width: 100%;
  display: block;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
}

body[data-theme="dark"] .image-strip img {
  background: #0f141d;
}

.option-title {
  font-size: 1.04rem;
}

.options-list {
  display: grid;
  gap: 10px;
}

.option-empty {
  margin: 0;
  color: var(--ink-muted);
  border: 1px dashed var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.45);
}

body[data-theme="dark"] .option-empty {
  background: rgba(16, 23, 34, 0.75);
}

.option-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 11px;
  background: #fffdf8;
  cursor: pointer;
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.option-card .block-container p {
  white-space: pre-line;
}

body[data-theme="dark"] .option-card {
  background: #151b26;
}

.option-card:hover {
  transform: translateY(-1px);
  border-color: #c2b19d;
}

body[data-theme="dark"] .option-card:hover {
  border-color: #6f819b;
}

.option-card.selected {
  border-color: var(--accent);
  background: linear-gradient(145deg, #fff4ec, #ffe8d8);
  box-shadow: 0 0 0 2px rgba(223, 95, 61, 0.25), 0 10px 22px rgba(182, 87, 36, 0.18);
  transform: translateY(-1px) scale(1.01);
  animation: option-select-pop 220ms ease;
}

body[data-theme="dark"] .option-card.selected {
  background: linear-gradient(145deg, #2b201b, #33261f);
  box-shadow: 0 0 0 2px rgba(240, 138, 74, 0.42), 0 12px 24px rgba(0, 0, 0, 0.35);
}

.option-card.selected .option-key {
  background: var(--accent);
  color: #fff;
}

.option-card:focus-visible {
  outline: 2px solid var(--accent-alt);
  outline-offset: 2px;
}

.option-card.correct {
  border-color: var(--correct);
  background: #edf8f1;
}

.option-card.wrong {
  border-color: var(--wrong);
  background: #fff1f1;
}

.option-key {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  text-transform: uppercase;
  background: #efe2d2;
}

body[data-theme="dark"] .option-key {
  background: #2f3a4b;
}

.option-card.correct .option-key {
  background: #c5ebd5;
}

body[data-theme="dark"] .option-card.correct .option-key {
  background: #29553e;
}

.option-card.wrong .option-key {
  background: #f4c9c9;
}

body[data-theme="dark"] .option-card.wrong .option-key {
  background: #5b2e2e;
}

.action-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.action-row .btn {
  flex: 1 1 200px;
}

.feedback {
  padding: 10px 12px;
  border-radius: 12px;
  font-weight: 600;
}

.feedback.correct {
  color: #0f6a3e;
  background: #daf0e4;
  border: 1px solid #addfc5;
}

body[data-theme="dark"] .feedback.correct {
  color: #bbf2d2;
  background: #163627;
  border: 1px solid #2f6e50;
}

.feedback.wrong {
  color: #842626;
  background: #f8dede;
  border: 1px solid #ebb8b8;
}

body[data-theme="dark"] .feedback.wrong {
  color: #ffd7d7;
  background: #3b1f22;
  border: 1px solid #815058;
}

.solution {
  border-top: 1px solid var(--line);
  padding-top: 12px;
  display: grid;
  gap: 10px;
}

.solution h3 {
  font-size: 1rem;
}

.summary {
  margin-top: 18px;
  display: grid;
  gap: 10px;
  animation: rise-in 260ms ease both;
}

.summary-text {
  margin: 0;
  color: var(--ink-muted);
}

.review-list {
  display: grid;
  gap: 8px;
}

.review-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
  background: #fffefc;
  display: grid;
  gap: 6px;
}

body[data-theme="dark"] .review-item {
  background: #141a24;
}

.review-item.status-correct {
  border-color: #9fd2b5;
  background: #f2fbf5;
}

.review-item.status-wrong {
  border-color: #e2aaaa;
  background: #fff7f7;
}

.review-item.status-unanswered {
  border-color: #d9c694;
  background: #fffdf5;
}

.review-item.status-ungraded {
  border-color: var(--line);
  background: #fffefc;
}

body[data-theme="dark"] .review-item.status-correct {
  border-color: #2f6f50;
  background: #16261e;
}

body[data-theme="dark"] .review-item.status-wrong {
  border-color: #7b4646;
  background: #281b1d;
}

body[data-theme="dark"] .review-item.status-unanswered {
  border-color: #6f623d;
  background: #2a2517;
}

body[data-theme="dark"] .review-item.status-ungraded {
  border-color: var(--line);
  background: #141a24;
}

.review-status {
  margin-top: 0;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
}

.review-status.correct {
  color: #1e7f4f;
}

.review-status.wrong {
  color: #9e2f2f;
}

.review-status.unanswered {
  color: #8a6b1f;
}

.review-status.ungraded {
  color: var(--ink-muted);
}

body[data-theme="dark"] .review-status.correct {
  color: #6fdbab;
}

body[data-theme="dark"] .review-status.wrong {
  color: #ffa3a3;
}

body[data-theme="dark"] .review-status.unanswered {
  color: #f0ce75;
}

.review-solution {
  border-top: 1px dashed var(--line);
  padding-top: 8px;
}

.review-item p {
  margin: 0;
}

.review-item .small {
  color: var(--ink-muted);
  margin-top: 4px;
  font-size: 0.88rem;
}

body.modal-open {
  overflow: hidden;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 12;
  background: rgba(15, 20, 29, 0.58);
  display: grid;
  place-items: center;
  padding: 18px;
}

.modal-card {
  width: min(760px, 100%);
  max-height: min(86vh, 760px);
  overflow: auto;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--surface), var(--surface-strong));
  box-shadow: var(--shadow);
  padding: 16px;
  display: grid;
  gap: 10px;
}

.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.modal-close {
  border: 1px solid var(--line);
  background: #fffaf4;
  color: var(--ink);
  border-radius: 10px;
  padding: 7px 11px;
  font: 600 0.85rem/1 "Space Grotesk", "Segoe UI", sans-serif;
  cursor: pointer;
}

.modal-meta {
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.modal-content {
  border-top: 1px dashed var(--line);
  padding-top: 10px;
}

body[data-theme="dark"] .modal-overlay {
  background: rgba(2, 5, 10, 0.72);
}

body[data-theme="dark"] .modal-close {
  background: #162130;
}

@keyframes option-select-pop {
  0% {
    transform: translateY(0) scale(1);
  }
  100% {
    transform: translateY(-1px) scale(1.01);
  }
}

@keyframes rise-in {
  from {
    transform: translateY(10px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@media (max-width: 860px) {
  .control-grid {
    grid-template-columns: 1fr;
  }

  .setup-side {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 24px 14px 42px;
  }

  body.quiz-focus-mode .app-shell {
    padding-top: 12px;
  }

  body.summary-focus-mode .app-shell {
    padding-top: 12px;
  }

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

  .setup-side {
    grid-template-columns: 1fr;
  }

  .progress-row {
    flex-direction: column;
    gap: 4px;
  }

  .progress-main {
    align-self: flex-start;
  }

  .option-card {
    grid-template-columns: 1fr;
  }

  .option-key {
    width: fit-content;
    border-radius: 9px;
    padding: 2px 10px;
    height: auto;
  }

  .theme-toggle {
    width: 100%;
    justify-content: center;
  }

  .modal-card {
    max-height: 92vh;
    padding: 12px;
  }
}