:root {
  --bg: #07111f;
  --bg-soft: #0d1b30;
  --panel: rgba(9, 20, 37, 0.92);
  --panel-strong: rgba(11, 24, 45, 0.98);
  --border: rgba(124, 146, 184, 0.25);
  --text: #edf2ff;
  --muted: #9eb0d6;
  --accent: #ffb55a;
  --accent-strong: #ff8d3b;
  --correct: #63d79e;
  --wrong: #ff7474;
  --chip: rgba(17, 33, 60, 0.9);
  --shadow: 0 28px 70px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(255, 141, 59, 0.18), transparent 32%),
    radial-gradient(circle at bottom left, rgba(87, 163, 255, 0.18), transparent 28%),
    linear-gradient(180deg, #07111f 0%, #040a14 100%);
}

.shell {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 36px 0 calc(56px + env(safe-area-inset-bottom, 0px));
}

.hero {
  padding: 28px 28px 18px;
}

.eyebrow,
.case-kicker,
.section-label,
.stat-label {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1,
.panel-title,
.case-stem {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.hero-copy,
.muted,
.source-links,
.feedback-copy {
  color: var(--muted);
  line-height: 1.55;
}

.panel,
.case-card,
.feedback-panel,
.stat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.panel,
.case-card,
.feedback-panel {
  padding: 22px;
  margin-top: 18px;
}

.panel-top,
.case-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}

.panel-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.chip-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.answer-mode-block {
  margin-top: 16px;
}

.answer-mode-label {
  display: block;
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.mode-toggle {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.mode-btn {
  padding: 10px 16px;
}

.answer-mode-note {
  margin: 10px 0 0;
  max-width: 760px;
}

.chip,
.answer-btn,
.primary-btn,
.ghost-btn {
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  -webkit-tap-highlight-color: transparent;
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

.chip,
.answer-btn,
.ghost-btn {
  background: var(--chip);
  color: var(--text);
}

.chip:hover,
.answer-btn:hover,
.primary-btn:hover,
.ghost-btn:hover {
  transform: translateY(-1px);
}

.chip {
  padding: 10px 16px;
}

.chip.active {
  background: linear-gradient(135deg, rgba(255, 141, 59, 0.22), rgba(255, 181, 90, 0.18));
  border-color: rgba(255, 181, 90, 0.55);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.stat-card {
  padding: 18px 20px;
}

.stat-card strong {
  font-size: 1.7rem;
}

.case-stem {
  margin-top: 4px;
  font-size: clamp(1.2rem, 2.2vw, 1.8rem);
  line-height: 1.3;
}

.case-tag {
  display: inline-flex;
  align-items: center;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 181, 90, 0.1);
  color: var(--accent);
  border: 1px solid rgba(255, 181, 90, 0.22);
  white-space: nowrap;
}

.case-findings-block {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(124, 146, 184, 0.18);
}

.finding-list {
  margin: 14px 0 0;
  padding-left: 18px;
  line-height: 1.6;
}

.answer-groups {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.answer-group {
  background: var(--panel-strong);
  border: 1px solid rgba(124, 146, 184, 0.18);
  border-radius: 20px;
  padding: 16px;
}

.answer-title {
  margin: 0 0 12px;
  font-size: 1rem;
}

.answer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.manual-answer-wrap {
  display: grid;
  gap: 10px;
}

.manual-answer-input {
  width: min(240px, 100%);
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(11, 24, 45, 0.98);
  color: var(--text);
  font: inherit;
}

.manual-answer-input:focus {
  outline: 2px solid rgba(255, 181, 90, 0.3);
  border-color: rgba(255, 181, 90, 0.72);
}

.manual-answer-input.correct {
  border-color: rgba(99, 215, 158, 0.8);
  background: rgba(99, 215, 158, 0.12);
}

.manual-answer-input.wrong {
  border-color: rgba(255, 116, 116, 0.8);
  background: rgba(255, 116, 116, 0.12);
}

.manual-answer-input:disabled {
  opacity: 1;
  cursor: not-allowed;
}

.manual-answer-hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.answer-btn {
  min-width: 72px;
  padding: 10px 14px;
}

.answer-btn.selected {
  border-color: rgba(255, 181, 90, 0.7);
  background: rgba(255, 181, 90, 0.16);
}

.answer-btn.correct {
  border-color: rgba(99, 215, 158, 0.8);
  background: rgba(99, 215, 158, 0.18);
}

.answer-btn.wrong {
  border-color: rgba(255, 116, 116, 0.8);
  background: rgba(255, 116, 116, 0.16);
}

.primary-btn,
.ghost-btn {
  padding: 12px 18px;
}

.primary-btn {
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  color: #1a1207;
  border: none;
  font-weight: 700;
}

.feedback-panel {
  display: none;
}

.feedback-panel.visible {
  display: block;
}

.feedback-panel.correct-state {
  border-color: rgba(99, 215, 158, 0.4);
}

.feedback-panel.wrong-state {
  border-color: rgba(255, 116, 116, 0.4);
}

.feedback-title {
  margin: 0 0 10px;
  font-size: 1.2rem;
}

.feedback-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0;
}

.feedback-explanations {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.feedback-explanation {
  background: rgba(13, 27, 48, 0.72);
  border: 1px solid rgba(124, 146, 184, 0.2);
  border-radius: 18px;
  padding: 14px 16px;
}

.feedback-explanation-title {
  margin: 0 0 6px;
  font-size: 0.98rem;
  color: var(--text);
}

.feedback-explanation-copy {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.summary-pill {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(16, 30, 52, 0.9);
}

.summary-pill.good {
  border-color: rgba(99, 215, 158, 0.5);
  color: var(--correct);
}

.summary-pill.bad {
  border-color: rgba(255, 116, 116, 0.5);
  color: #ffb0b0;
}

.source-panel summary {
  cursor: pointer;
  color: var(--accent);
  font-weight: 700;
}

.source-links {
  margin-top: 16px;
}

.source-links ul {
  margin: 8px 0 0;
  padding-left: 18px;
}

.source-links a {
  color: #9fd4ff;
}

.site-footer {
  margin: 26px auto 0;
  max-width: 860px;
  padding: 0 20px;
  text-align: center;
  color: rgba(158, 176, 214, 0.82);
  font-size: 0.82rem;
  line-height: 1.55;
}

.site-footer p {
  margin: 0;
}

.site-footer p + p {
  margin-top: 6px;
}

.mobile-actions {
  display: none;
}

@media (max-width: 820px) {
  .shell {
    width: min(100vw - 20px, 1000px);
    padding-top: 20px;
    padding-bottom: calc(104px + env(safe-area-inset-bottom, 0px));
  }

  .panel-top,
  .case-header {
    flex-direction: column;
  }

  .panel,
  .case-card,
  .feedback-panel,
  .stat-card {
    border-radius: 20px;
  }

  .hero {
    padding: 14px 8px 12px;
  }

  .panel-actions {
    width: 100%;
  }

  .panel-actions .ghost-btn,
  .panel-top > .primary-btn {
    flex: 1 1 0;
  }

  .chip-row {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 6px;
    margin-inline: -2px;
    scrollbar-width: thin;
  }

  .chip-row .chip {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .mode-toggle {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .mobile-actions {
    position: fixed;
    left: 10px;
    right: 10px;
    bottom: calc(10px + env(safe-area-inset-bottom, 0px));
    z-index: 20;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    gap: 10px;
    padding: 10px;
    border: 1px solid rgba(124, 146, 184, 0.3);
    border-radius: 22px;
    background: rgba(7, 17, 31, 0.92);
    backdrop-filter: blur(20px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
  }

  .mobile-action-btn {
    width: 100%;
  }

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

@media (max-width: 560px) {
  .hero h1 {
    font-size: clamp(1.8rem, 9vw, 2.5rem);
  }

  .panel,
  .case-card,
  .feedback-panel {
    padding: 18px;
  }

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

  .mode-toggle,
  .answer-grid,
  .mobile-actions {
    grid-template-columns: 1fr;
  }

  .answer-btn {
    width: 100%;
  }

  .manual-answer-input {
    width: 100%;
  }
}