:root {
  --bg-1: #f7efe4;
  --bg-2: #f4dac4;
  --surface: #fffdf8;
  --surface-strong: #ffffff;
  --ink: #1d1f2a;
  --ink-soft: #4a4f63;
  --accent: #0d5f7a;
  --accent-2: #c23b22;
  --accent-soft: #dff0f5;
  --ok: #196c4c;
  --bad: #a52f2f;
  --warn: #a07100;
  --border: #d8d5cf;
  --shadow: 0 20px 40px rgba(25, 24, 35, 0.08);
  --radius-lg: 18px;
  --radius-md: 12px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Manrope", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 20%, rgba(13, 95, 122, 0.12), transparent 40%),
    radial-gradient(circle at 85% 10%, rgba(194, 59, 34, 0.1), transparent 35%),
    linear-gradient(140deg, var(--bg-1) 0%, var(--bg-2) 100%);
}

.shell {
  width: min(1120px, calc(100% - 28px));
  margin: 24px auto 40px;
}

.hero {
  margin-bottom: 16px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
}

h1,
h2,
h3 {
  font-family: "Sora", sans-serif;
  letter-spacing: -0.02em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.8rem, 3.8vw, 2.9rem);
  line-height: 1.07;
  max-width: 18ch;
}

.lede {
  margin: 14px 0 0;
  max-width: 58ch;
  color: var(--ink-soft);
}

.hero-actions {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.panel {
  background: linear-gradient(180deg, var(--surface-strong) 0%, var(--surface) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 18px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.stat-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px;
}

.stat-card p {
  margin: 0;
  font-size: 0.83rem;
  color: var(--ink-soft);
}

.stat-card strong {
  margin-top: 6px;
  display: block;
  font-size: 1.45rem;
}

.status-message {
  margin: 12px 0 0;
  color: var(--ink-soft);
}

.source-picker {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #fff;
  overflow: hidden;
}

.source-picker-toggle {
  width: 100%;
  border: 0;
  background: #fff;
  color: var(--ink);
  min-height: 54px;
  padding: 10px 12px;
  cursor: pointer;
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 10px;
  align-items: center;
}

.source-picker-title {
  text-align: left;
  font-weight: 700;
  font-family: "Sora", sans-serif;
}

.source-picker-meta {
  font-size: 0.84rem;
  color: var(--ink-soft);
}

.source-picker-chevron {
  width: 10px;
  height: 10px;
  border-right: 2px solid #7a7a88;
  border-bottom: 2px solid #7a7a88;
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.source-picker-toggle[aria-expanded="true"] .source-picker-chevron {
  transform: rotate(225deg);
}

.source-picker-content {
  border-top: 1px solid var(--border);
  padding: 12px;
}

.source-picker-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.source-selection-summary {
  margin: 8px 0 10px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

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

.source-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  padding: 9px 10px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.source-item input {
  margin-top: 2px;
}

.source-item strong {
  font-size: 0.95rem;
  display: block;
}

.source-item span {
  font-size: 0.84rem;
  color: var(--ink-soft);
}

.top-strip {
  margin-top: 18px;
  margin-bottom: 12px;
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 10px;
  align-items: center;
}

.timer-wrap,
.progress-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #fff;
  padding: 10px 12px;
}

.timer-wrap p,
.progress-wrap p {
  margin: 0;
  font-size: 0.84rem;
  color: var(--ink-soft);
}

.timer-wrap strong,
.progress-wrap strong {
  margin-top: 3px;
  display: block;
  font-size: 1.35rem;
}

.quiz-layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 12px;
}

.navigator h2 {
  margin: 2px 0 4px;
  font-size: 1.05rem;
}

.navigator p {
  margin: 0 0 10px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.question-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 7px;
}

.question-jump {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-weight: 700;
  min-height: 35px;
  cursor: pointer;
}

.question-jump.current {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.question-jump.correct,
.question-jump.answered {
  background: #e9f8f0;
  border-color: #b8e2cb;
}

.question-jump.wrong {
  background: #ffe8e8;
  border-color: #e8bbbb;
}

.question-stage {
  min-height: 420px;
  display: flex;
  flex-direction: column;
}

.question-meta {
  margin: 2px 0 6px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.question-source {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.86rem;
  font-weight: 700;
}

.question-prompt {
  margin: 0;
  line-height: 1.35;
  font-size: clamp(1.1rem, 2vw, 1.4rem);
}

.option-list {
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

.option-btn {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  width: 100%;
  text-align: left;
  padding: 12px 14px;
  color: var(--ink);
  font-size: 0.98rem;
  line-height: 1.3;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.option-btn:hover {
  transform: translateY(-1px);
  border-color: #98b6bf;
}

.option-btn.selected {
  border-color: var(--accent);
  background: #edf8fc;
}

.option-btn.correct {
  border-color: #329d71;
  background: #e8f8f0;
}

.option-btn.wrong {
  border-color: #c15151;
  background: #fff0f0;
}

.option-btn.locked {
  cursor: not-allowed;
  opacity: 0.75;
}

.question-lock-note {
  margin: 10px 0 0;
  font-size: 0.9rem;
  color: var(--bad);
  font-weight: 700;
}

.stage-actions {
  margin-top: auto;
  padding-top: 14px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.mobile-feed {
  display: none;
}

.mobile-question {
  padding: 12px 4px 18px;
  border-bottom: 1px solid #e8e8ed;
}

.mobile-question:last-child {
  border-bottom: 0;
}

.mobile-question-number {
  margin: 0;
  font-size: 2rem;
  font-family: "Sora", sans-serif;
  font-weight: 500;
}

.mobile-question-text {
  margin: 12px 0;
  font-size: 1.95rem;
  line-height: 1.22;
  letter-spacing: -0.015em;
}

.mobile-question-source {
  margin: 0 0 12px;
  color: var(--ink-soft);
  font-size: 1rem;
}

.mobile-options {
  display: grid;
  gap: 8px;
}

.mobile-option-btn {
  border: 0;
  border-radius: 0;
  background: transparent;
  text-align: left;
  font-size: 1.9rem;
  line-height: 1.3;
  padding: 2px 0;
  color: var(--ink);
  cursor: pointer;
  font-weight: 400;
}

.mobile-option-btn.selected,
.mobile-option-btn.correct {
  color: var(--ok);
  font-weight: 600;
}

.mobile-option-btn.wrong {
  color: var(--bad);
  font-weight: 600;
}

.mobile-option-btn.locked {
  opacity: 0.7;
  cursor: not-allowed;
}

.mobile-lock-note {
  margin: 8px 0 0;
  color: var(--bad);
  font-size: 1rem;
  font-weight: 600;
}

.result-metrics {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 12px;
}

.result-metrics article {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  padding: 10px 12px;
}

.result-metrics p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.84rem;
}

.result-metrics strong {
  margin-top: 4px;
  display: block;
  font-size: 1.15rem;
}

.review-list {
  margin-top: 14px;
  display: grid;
  gap: 10px;
}

.review-item {
  border: 1px solid #efc5c5;
  border-radius: 12px;
  padding: 10px;
  background: #fff6f6;
}

.review-item p {
  margin: 0;
  line-height: 1.35;
}

.review-item .good {
  color: var(--ok);
}

.review-item .bad {
  color: var(--bad);
}

.review-item .extract {
  margin-top: 4px;
  color: var(--warn);
}

.review-item .explanation {
  margin-top: 4px;
  color: var(--accent);
  font-style: italic;
}

.review-item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
}

/* Difficulty badges */
.difficulty-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border-radius: 6px;
  white-space: nowrap;
}

.difficulty-easy {
  background: #e9f8f0;
  color: var(--ok);
  border: 1px solid #b8e2cb;
}

.difficulty-medium {
  background: #fff8e1;
  color: var(--warn);
  border: 1px solid #e8d5a0;
}

.difficulty-hard {
  background: #fff0f0;
  color: var(--bad);
  border: 1px solid #e8bbbb;
}

.question-stage-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

/* Modal correct answer and explanation */
.modal-correct {
  margin: 0 0 8px;
  color: var(--ok);
  font-weight: 700;
  font-size: 0.95rem;
}

.modal-explanation {
  margin: 0 0 10px;
  color: var(--accent);
  font-style: italic;
  font-size: 0.92rem;
  line-height: 1.4;
}

.helper {
  margin-top: 18px;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.helper code {
  background: #ffffff;
  padding: 1px 5px;
  border-radius: 6px;
}

.btn {
  border: 0;
  border-radius: 12px;
  min-height: 44px;
  padding: 0 16px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-ghost {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--border);
}

.btn-danger {
  background: var(--accent-2);
  color: #fff;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(11, 15, 29, 0.55);
  display: grid;
  place-items: center;
  padding: 18px;
  z-index: 1200;
}

.modal-card {
  width: min(560px, 100%);
  border-radius: 14px;
  border: 1px solid #e6d4d4;
  background: #fff;
  padding: 16px;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.25);
}

.modal-card h2 {
  margin: 0 0 8px;
  font-size: 1.15rem;
}

.modal-source {
  margin: 0 0 8px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.modal-extract {
  margin: 0;
  line-height: 1.45;
  border-left: 3px solid var(--accent);
  padding-left: 10px;
}

.modal-actions {
  margin-top: 14px;
  display: flex;
  justify-content: flex-end;
}

.hidden {
  display: none;
}

.reveal {
  animation: riseIn 0.55s ease both;
}

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

@media (max-width: 980px) {
  .quiz-layout {
    grid-template-columns: 1fr;
  }

  .question-grid {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  body {
    background: #f6f6f8;
  }

  .shell {
    width: min(100%, calc(100% - 16px));
    margin-top: 10px;
  }

  .hero,
  .helper {
    padding-left: 4px;
    padding-right: 4px;
  }

  .hero h1 {
    font-size: 1.8rem;
    max-width: none;
  }

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

  .top-strip {
    grid-template-columns: 1fr;
  }

  .source-picker-actions .btn {
    min-height: 38px;
    padding: 0 12px;
  }

  .hero-actions .btn {
    width: 100%;
  }

  #desktop-quiz-layout {
    display: none;
  }

  .mobile-feed {
    display: block;
    margin-top: 12px;
    padding: 14px 14px 8px;
    border-radius: 18px;
  }

  .result-metrics {
    grid-template-columns: 1fr;
  }

  .modal-card {
    width: 100%;
    border-radius: 12px;
    padding: 14px;
  }
}