* {
  box-sizing: border-box;
}

:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --success: #16a34a;
  --success-dark: #15803d;
  --border: #dbe4f0;
  --shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
  --shadow-soft: 0 4px 10px rgba(15, 23, 42, 0.06);
  --radius: 18px;
}

body {
  margin: 0;
  font-family: Inter, Arial, Helvetica, sans-serif;
  background: linear-gradient(180deg, #eef4ff 0%, var(--bg) 100%);
  color: var(--text);
}

.app {
  width: min(1400px, 95vw);
  margin: 0 auto;
  padding: 24px 0 40px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
}

.subtitle {
  margin: 6px 0 0;
  color: var(--muted);
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 22px;
  align-items: start;
}

.panel {
  display: grid;
  gap: 16px;
  position: sticky;
  top: 16px;
}

.panel-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: 18px;
}

.panel-card h2 {
  margin-top: 0;
  font-size: 1.05rem;
}

.status-message,
.answer-box,
.panel-card p,
.panel-card label {
  color: var(--muted);
  line-height: 1.45;
}

.answer-box {
  min-height: 48px;
  background: #f8fbff;
  border: 1px dashed #bfd3f5;
  border-radius: 12px;
  padding: 12px;
  margin-top: 12px;
}

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

.stat {
  background: #f8fbff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  text-align: center;
}

.stat-label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 6px;
}

.btn,
select {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--border);
  padding: 12px 14px;
  font-size: 0.98rem;
}

.btn {
  cursor: pointer;
  border: none;
  color: white;
  font-weight: 700;
  transition: transform 0.18s ease, opacity 0.18s ease, box-shadow 0.18s ease;
  box-shadow: var(--shadow-soft);
}

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

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

.btn-primary {
  background: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-success {
  background: var(--success);
  margin-top: 12px;
}

.btn-success:hover {
  background: var(--success-dark);
}

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

.question-btn {
  width: 100%;
  border: 1px solid var(--border);
  background: #f8fbff;
  color: var(--text);
  border-radius: 12px;
  padding: 10px 12px;
  cursor: pointer;
  text-align: left;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.question-btn:hover {
  transform: translateY(-1px);
  background: #eef5ff;
  border-color: #b6caf1;
}

.board-section {
  min-width: 0;
}

.board {
  display: grid;
  grid-template-columns: repeat(6, minmax(130px, 1fr));
  gap: 16px;
}

.card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease, filter 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.card.selected {
  outline: 3px solid #93c5fd;
  outline-offset: 2px;
}

.card.discarded {
  opacity: 0.45;
  filter: grayscale(0.95);
}

.card.discarded .discard-overlay {
  opacity: 1;
}

.card-image-wrap {
  aspect-ratio: 1 / 1;
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  display: grid;
  place-items: center;
  overflow: hidden;
}

.card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.placeholder {
  width: 100%;
  height: 100%;
  padding: 14px;
  display: grid;
  place-items: center;
  text-align: center;
  color: #36507a;
  font-weight: 700;
}

.card-body {
  padding: 12px;
}

.card-name {
  margin: 0 0 10px;
  font-size: 1rem;
}

.card-actions {
  display: grid;
  gap: 8px;
}

.card-btn {
  border: 1px solid var(--border);
  background: #f8fbff;
  color: var(--text);
  border-radius: 10px;
  padding: 9px 10px;
  cursor: pointer;
  transition: background 0.18s ease, transform 0.18s ease;
}

.card-btn:hover {
  background: #eef5ff;
  transform: translateY(-1px);
}

.discard-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(220, 38, 38, 0.18);
  color: #991b1b;
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: 1px;
  opacity: 0;
  transition: opacity 0.18s ease;
  pointer-events: none;
}

code {
  background: #eef5ff;
  padding: 2px 6px;
  border-radius: 6px;
}

@media (max-width: 1150px) {
  .board {
    grid-template-columns: repeat(4, minmax(130px, 1fr));
  }
}

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

  .panel {
    position: static;
  }

  .board {
    grid-template-columns: repeat(3, minmax(120px, 1fr));
  }
}

@media (max-width: 560px) {
  .app {
    width: min(98vw, 100%);
    padding-top: 16px;
  }

  .topbar {
    flex-direction: column;
    align-items: stretch;
  }

  .board {
    grid-template-columns: repeat(2, minmax(120px, 1fr));
  }
}