:root {
  --bg: #07111f;
  --bg-2: #0d1c34;
  --panel: rgba(11, 22, 46, 0.88);
  --panel-2: rgba(16, 29, 60, 0.95);
  --line: rgba(120, 160, 255, 0.18);
  --text: #f8fbff;
  --muted: #9fb0d1;
  --gold: #ffd54a;
  --blue: #4f46e5;
  --blue-2: #2563eb;
  --green: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --purple: #7c3aed;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
  --radius: 20px;
}

* {
  box-sizing: border-box;
}

.site-header,
.app-shell,
.site-footer {
  width: min(1280px, calc(100% - 32px));
  margin-inline: auto;
}

@media (max-width: 640px) {
  .site-logo {
    height: 52px;
  }
}

.brand-mark {
  width: 56px;
  height: 56px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  box-shadow: var(--shadow);
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

.brand p {
  margin: 4px 0 0;
  color: var(--muted);
}

.main-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tab-btn,
.secondary-btn,
.primary-btn,
#play {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 800;
  color: white;
  transition:
    transform 0.18s ease,
    filter 0.18s ease,
    background 0.18s ease;
}

.tab-btn,
.secondary-btn {
  background: rgba(255, 255, 255, 0.06);
}

.tab-btn.active,
.primary-btn,
#play {
  background: linear-gradient(135deg, var(--blue), var(--purple));
  border: none;
  box-shadow: var(--shadow);
}

.tab-btn:hover,
.secondary-btn:hover,
.primary-btn:hover,
#play:hover {
  transform: translateY(-2px);
  filter: brightness(1.06);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.panel-header h2 {
  margin: 0 0 6px;
}

.panel-header p {
  margin: 0;
  color: var(--muted);
}

.game-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 18px;
}

.board-panel,
.interaction-panel,
.placeholder-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 10px;
  table-layout: fixed;
}

th {
  background: linear-gradient(
    180deg,
    rgba(37, 99, 235, 0.95),
    rgba(30, 64, 175, 0.95)
  );
  border-radius: 14px;
  padding: 14px 10px;
  text-transform: uppercase;
  color: white;
  letter-spacing: 0.06em;
  font-size: 0.82rem;
}

td {
  vertical-align: top;
}

.clue {
  display: block;
  margin-bottom: 10px;
  padding: 18px 10px;
  text-align: center;
  border-radius: 16px;
  background: linear-gradient(
    180deg,
    rgba(24, 66, 207, 0.96),
    rgba(18, 48, 150, 0.96)
  );
  color: var(--gold);
  font-weight: 900;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 14px 26px rgba(0, 0, 0, 0.22);
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    filter 0.18s ease;
}

.clue:hover {
  transform: translateY(-4px) scale(1.01);
  filter: brightness(1.08);
  box-shadow: 0 18px 30px rgba(37, 99, 235, 0.35);
}

.clue.viewed {
  background: linear-gradient(
    180deg,
    rgba(69, 79, 110, 0.88),
    rgba(47, 54, 80, 0.9)
  );
  color: rgba(255, 255, 255, 0.45);
  text-decoration: line-through;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.active-clue {
  min-height: 180px;
  background: linear-gradient(
    180deg,
    rgba(10, 22, 58, 0.98),
    rgba(7, 15, 38, 0.98)
  );
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 22px;
  display: grid;
  place-items: center;
  text-align: center;
  font-size: 1.15rem;
  line-height: 1.6;
}

.empty-state {
  color: var(--muted);
}

.empty-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 10px;
}

.active-clue .label {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.answer-box,
.learn-panel {
  margin-top: 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
}

.answer-box label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-weight: 700;
}

.answer-box input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  color: white;
  outline: none;
}

.answer-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 12px;
}

.learn-panel h3 {
  margin: 0 0 10px;
}

.learn-panel p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

#spinner {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(3, 7, 18, 0.55);
  z-index: 999;
}

#spinner i {
  font-size: 3rem;
  color: white;
}

.disabled {
  display: none !important;
}

.fade-in {
  animation: fadeInUp 0.32s ease;
}

.correct-flash {
  animation: correctFlash 0.45s ease;
}

.wrong-shake {
  animation: wrongShake 0.45s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes correctFlash {
  0% {
    box-shadow: 0 0 0 rgba(34, 197, 94, 0);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(34, 197, 94, 0.18);
  }
  100% {
    box-shadow: 0 0 0 rgba(34, 197, 94, 0);
  }
}

@keyframes wrongShake {
  0%,
  100% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-6px);
  }
  40% {
    transform: translateX(6px);
  }
  60% {
    transform: translateX(-5px);
  }
  80% {
    transform: translateX(5px);
  }
}

@media (max-width: 1050px) {
  .game-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 780px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .panel-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 560px) {
  body {
    padding: 14px;
  }

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

  table {
    border-spacing: 6px;
  }

  th {
    font-size: 0.68rem;
    padding: 10px 6px;
  }

  .clue {
    font-size: 0.95rem;
    padding: 14px 8px;
  }

  .answer-actions {
    grid-template-columns: 1fr;
  }
}

.answer-actions {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  margin-top: 12px;
}

.feedback.correct {
  color: var(--green);
}

.feedback.wrong {
  color: var(--danger);
}

.feedback.info {
  color: var(--warning);
}

/* Better hint readability */
.feedback.hint {
  font-family: "Courier New", Courier, monospace;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: #fcd34d;
  background: rgba(252, 211, 77, 0.08);
  border: 1px solid rgba(252, 211, 77, 0.18);
  border-radius: 12px;
  padding: 10px 12px;
}

@media (max-width: 560px) {
  .answer-actions {
    grid-template-columns: 1fr;
  }
}

.practice-layout,
.learn-grid {
  display: grid;
  gap: 18px;
}

.practice-layout {
  grid-template-columns: 2fr 1fr;
}

.practice-card,
.practice-stats-card,
.learn-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.practice-toolbar {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.practice-toolbar select,
#practice-answer {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  color: white;
  outline: none;
}

.practice-question {
  min-height: 110px;
  margin-bottom: 14px;
  padding: 16px;
  border-radius: 16px;
  background: linear-gradient(
    180deg,
    rgba(10, 22, 58, 0.98),
    rgba(7, 15, 38, 0.98)
  );
  border: 1px solid var(--line);
  line-height: 1.6;
}

#practice-answer {
  width: 100%;
  margin-bottom: 12px;
}

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

.learn-card h3,
.practice-stats-card h3 {
  margin-top: 0;
}

.learn-card ul,
.resource-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.learn-card p,
.practice-stats-card p {
  color: var(--muted);
  line-height: 1.6;
}

.learn-card a {
  color: var(--gold);
  text-decoration: none;
}

.learn-card a:hover {
  text-decoration: underline;
}

@media (max-width: 900px) {
  .practice-layout,
  .learn-grid {
    grid-template-columns: 1fr;
  }
}