:root {
  --bg: #f0f7ff;
  --card: #ffffff;
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --secondary: #10b981;
  --secondary-dark: #059669;
  --danger: #ef4444;
  --warning: #f59e0b;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(59,130,246,0.10);
  --radius: 18px;
  --radius-sm: 10px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Nunito', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ========== SCREENS ========== */
.screen {
  display: none;
  min-height: 100vh;
  animation: fadeIn 0.4s ease;
}
.screen.active { display: flex; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ========== LANDING ========== */
#screen-landing {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  background: linear-gradient(145deg, #e0f2fe 0%, #f0fdf4 100%);
  position: relative;
  overflow: hidden;
}
#screen-landing::before {
  content: '';
  position: absolute;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(59,130,246,0.12) 0%, transparent 70%);
  top: -100px; right: -100px;
  border-radius: 50%;
}
#screen-landing::after {
  content: '';
  position: absolute;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(16,185,129,0.10) 0%, transparent 70%);
  bottom: -80px; left: -80px;
  border-radius: 50%;
}

.landing-badge {
  background: rgba(59,130,246,0.12);
  color: var(--primary);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 6px 16px;
  border-radius: 99px;
  margin-bottom: 24px;
}

.landing-title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 900;
  text-align: center;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}
.landing-title span { color: var(--primary); }

.landing-sub {
  font-size: 1.15rem;
  color: var(--text-muted);
  text-align: center;
  max-width: 480px;
  line-height: 1.7;
  margin-bottom: 40px;
  position: relative;
  z-index: 1;
}

.features-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 48px;
  position: relative;
  z-index: 1;
}
.feature-pill {
  background: white;
  border: 1.5px solid var(--border);
  border-radius: 99px;
  padding: 10px 20px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 36px;
  border-radius: 99px;
  font-family: 'Nunito', sans-serif;
  font-size: 1.05rem;
  font-weight: 800;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  position: relative;
  z-index: 1;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 20px rgba(59,130,246,0.35);
}
.btn-primary:hover { background: var(--primary-dark); box-shadow: 0 6px 28px rgba(59,130,246,0.45); transform: translateY(-2px); }

.btn-success {
  background: var(--secondary);
  color: white;
  box-shadow: 0 4px 20px rgba(16,185,129,0.30);
}
.btn-success:hover { background: var(--secondary-dark); transform: translateY(-2px); }

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: white; }

.btn-sm { padding: 10px 22px; font-size: 0.9rem; }
.btn-lg { padding: 20px 48px; font-size: 1.2rem; }

/* ========== SETUP SCREENS ========== */
.setup-wrap {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  min-height: 100vh;
}

.setup-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 48px 40px;
  max-width: 480px;
  width: 100%;
  text-align: center;
  border: 1.5px solid var(--border);
}

.step-indicator {
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}

.setup-title {
  font-size: 1.7rem;
  font-weight: 900;
  color: var(--text);
  margin-bottom: 8px;
}

.setup-sub {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.form-input {
  width: 100%;
  padding: 16px 20px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: 'Nunito', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  background: var(--bg);
  outline: none;
  transition: border-color 0.2s;
  text-align: center;
  margin-bottom: 20px;
}
.form-input:focus { border-color: var(--primary); }

.option-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}
.option-grid.cols-3 { grid-template-columns: 1fr 1fr 1fr; }

.option-btn {
  padding: 16px 12px;
  border: 2.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: white;
  font-family: 'Nunito', sans-serif;
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}
.option-btn:hover { border-color: var(--primary); color: var(--primary); background: rgba(59,130,246,0.04); }
.option-btn.selected { border-color: var(--primary); background: var(--primary); color: white; }

/* ========== GAME SCREEN ========== */
#screen-game {
  flex-direction: column;
  background: var(--bg);
}

.game-header {
  background: white;
  border-bottom: 1.5px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.game-logo {
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.progress-wrap {
  flex: 1;
  max-width: 300px;
}
.progress-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 4px;
}
.progress-bar {
  background: var(--border);
  border-radius: 99px;
  height: 8px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 99px;
  transition: width 0.5s ease;
}

.score-badge {
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: 99px;
  padding: 6px 16px;
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--secondary);
}

.game-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 20px;
}

.verb-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 32px;
  max-width: 520px;
  width: 100%;
  border: 1.5px solid var(--border);
  animation: slideUp 0.35s ease;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.verb-chip {
  display: inline-block;
  background: rgba(59,130,246,0.08);
  color: var(--primary);
  border-radius: 99px;
  padding: 4px 14px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.base-verb {
  font-family: 'Space Mono', monospace;
  font-size: clamp(2rem, 8vw, 3.5rem);
  font-weight: 700;
  color: var(--text);
  text-align: center;
  margin-bottom: 8px;
}

.base-verb-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 700;
  text-align: center;
  margin-bottom: 32px;
}

.fields-wrap {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.field-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.answer-input {
  width: 100%;
  padding: 14px 18px;
  border: 2.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: 'Space Mono', monospace;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  background: var(--bg);
  outline: none;
  transition: border-color 0.2s;
}
.answer-input:focus { border-color: var(--primary); background: white; }
.answer-input.correct { border-color: var(--secondary); background: rgba(16,185,129,0.05); }
.answer-input.wrong { border-color: var(--danger); background: rgba(239,68,68,0.05); }
.answer-input:disabled { cursor: not-allowed; }

.feedback-row {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  margin-top: 4px;
  min-height: 18px;
}
.feedback-row.ok { color: var(--secondary); }
.feedback-row.err { color: var(--danger); }

.feedback-msg {
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-weight: 800;
  font-size: 1rem;
  padding: 10px;
  margin-bottom: 12px;
  transition: all 0.3s;
}
.feedback-msg.correct { background: rgba(16,185,129,0.10); color: var(--secondary-dark); }
.feedback-msg.wrong { background: rgba(239,68,68,0.08); color: var(--danger); }

/* ========== RESULTS ========== */
#screen-results {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  background: linear-gradient(145deg, #e0f2fe 0%, #f0fdf4 100%);
}

.results-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 48px 40px;
  max-width: 480px;
  width: 100%;
  text-align: center;
  border: 1.5px solid var(--border);
  animation: popIn 0.5s cubic-bezier(0.34,1.56,0.64,1);
}
@keyframes popIn {
  from { opacity: 0; transform: scale(0.85); }
  to { opacity: 1; transform: scale(1); }
}

.result-emoji { font-size: 4rem; margin-bottom: 12px; }
.result-title { font-size: 1.8rem; font-weight: 900; color: var(--text); margin-bottom: 6px; }
.result-sub { font-size: 0.95rem; color: var(--text-muted); margin-bottom: 32px; }

.score-circle {
  width: 120px; height: 120px;
  border-radius: 50%;
  border: 8px solid var(--secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 32px;
  background: rgba(16,185,129,0.06);
}
.score-circle .pct { font-size: 2rem; font-weight: 900; color: var(--secondary); line-height: 1; }
.score-circle .pct-label { font-size: 0.75rem; font-weight: 700; color: var(--text-muted); }

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 32px;
}
.stat-box {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 16px;
  border: 1.5px solid var(--border);
}
.stat-box .val { font-size: 1.6rem; font-weight: 900; color: var(--text); }
.stat-box .lbl { font-size: 0.75rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }

.results-actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

/* ========== FLOATING ADMIN LINK ========== */
.admin-link {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #1e293b;
  color: #60a5fa;
  border: 1px solid #334155;
  border-radius: 99px;
  padding: 8px 16px;
  font-size: 0.75rem;
  font-weight: 800;
  cursor: pointer;
  z-index: 100;
  letter-spacing: 0.5px;
  transition: all 0.2s;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}
.admin-link:hover { background: #2563eb; color: white; }

/* ========== RESPONSIVE ========== */
@media (max-width: 600px) {
  .setup-card, .results-card { padding: 32px 20px; }
  .verb-card { padding: 28px 20px; }
}