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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
  min-height: 100vh;
  color: #fff;
}

/* ── Navigation ── */
nav {
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 0 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

nav .nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  height: 60px;
  gap: 2rem;
}

nav .logo {
  text-decoration: none;
  color: #fff;
  font-weight: 800;
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

nav .logo .logo-icon {
  font-size: 1.6rem;
}

nav .nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  flex-wrap: wrap;
}

nav .nav-links a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  padding: 0.4rem 0.9rem;
  border-radius: 8px;
  font-size: 0.9rem;
  transition: background 0.2s, color 0.2s;
}

nav .nav-links a:hover,
nav .nav-links a.active {
  background: rgba(255,255,255,0.12);
  color: #fff;
}

/* ── Hero ── */
.hero {
  text-align: center;
  padding: 4rem 2rem 3rem;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 900;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #00f2fe, #4facfe, #a855f7, #f472b6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .tagline {
  font-size: 1.4rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: 0.5rem;
}

.hero .sub-tagline {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 2rem;
}

.hero .badge {
  display: inline-block;
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  padding: 0.5rem 1.5rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 20px rgba(16,185,129,0.4);
}

/* ── Domain Cards Grid ── */
.domains-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem 4rem;
}

.domains-section h2 {
  text-align: center;
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.domains-section .section-sub {
  text-align: center;
  color: rgba(255,255,255,0.5);
  margin-bottom: 2rem;
  font-size: 1rem;
}

.track-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem 2.25rem;
}

.track-section h2 {
  text-align: center;
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.track-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
}

.track-grid-domains {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 900px) {
  .track-grid-domains {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .track-grid-domains {
    grid-template-columns: 1fr;
  }
}

.track-card {
  text-decoration: none;
  color: #fff;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.14);
  padding: 1.4rem;
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.track-card:hover {
  transform: translateY(-4px);
}

.track-icon {
  font-size: 2.35rem;
  display: inline-block;
  margin-bottom: 0.55rem;
}

.track-card h3 {
  margin-bottom: 0.4rem;
  font-size: 1.35rem;
}

.track-subtext {
  color: rgba(255,255,255,0.78);
  line-height: 1.45;
  margin-bottom: 0.2rem;
}

.track-card p {
  color: rgba(255,255,255,0.75);
  line-height: 1.45;
}

.track-cta {
  display: block;
  width: max-content;
  margin: 1rem auto 0;
  text-align: center;
  border-radius: 999px;
  padding: 0.68rem 1.7rem;
  font-weight: 800;
  font-size: 0.98rem;
  letter-spacing: 0.4px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.22);
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.track-card:hover .track-cta {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.28);
  filter: brightness(1.03);
}

.track-drills {
  background: linear-gradient(140deg, rgba(20,184,166,0.18), rgba(59,130,246,0.12));
}

.track-drills:hover {
  box-shadow: 0 12px 40px rgba(20,184,166,0.2);
  border-color: rgba(20,184,166,0.5);
}

.track-drills .track-cta {
  background: #14b8a6;
}

.track-cat {
  background: linear-gradient(140deg, rgba(245,158,11,0.2), rgba(239,68,68,0.14));
}

.track-cat:hover {
  box-shadow: 0 12px 40px rgba(245,158,11,0.24);
  border-color: rgba(245,158,11,0.55);
}

.track-cat .track-cta {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: #1f1300;
}

.track-games {
  background: linear-gradient(140deg, rgba(168,85,247,0.2), rgba(14,165,233,0.14));
}

.track-games:hover {
  box-shadow: 0 12px 40px rgba(168,85,247,0.24);
  border-color: rgba(168,85,247,0.55);
}

.track-games .track-cta {
  background: #a855f7;
}

.domain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.domain-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px;
  padding: 2rem;
  text-decoration: none;
  color: #fff;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
  position: relative;
  overflow: hidden;
}

.domain-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

.domain-card .card-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  display: block;
}

.domain-card .card-number {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 0.5rem;
  opacity: 0.6;
}

.domain-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.domain-card p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.5;
}

.domain-card .play-badge {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.3rem 1rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
}

/* Domain accent colors */
.domain-card.d1 { border-color: rgba(239,68,68,0.3); }
.domain-card.d1:hover { border-color: rgba(239,68,68,0.7); box-shadow: 0 12px 40px rgba(239,68,68,0.15); }
.domain-card.d1 .play-badge { background: #ef4444; }

.domain-card.d2 { border-color: rgba(249,115,22,0.3); }
.domain-card.d2:hover { border-color: rgba(249,115,22,0.7); box-shadow: 0 12px 40px rgba(249,115,22,0.15); }
.domain-card.d2 .play-badge { background: #f97316; }

.domain-card.d3 { border-color: rgba(234,179,8,0.3); }
.domain-card.d3:hover { border-color: rgba(234,179,8,0.7); box-shadow: 0 12px 40px rgba(234,179,8,0.15); }
.domain-card.d3 .play-badge { background: #eab308; }

.domain-card.d4 { border-color: rgba(34,197,94,0.3); }
.domain-card.d4:hover { border-color: rgba(34,197,94,0.7); box-shadow: 0 12px 40px rgba(34,197,94,0.15); }
.domain-card.d4 .play-badge { background: #22c55e; }

.domain-card.d5 { border-color: rgba(59,130,246,0.3); }
.domain-card.d5:hover { border-color: rgba(59,130,246,0.7); box-shadow: 0 12px 40px rgba(59,130,246,0.15); }
.domain-card.d5 .play-badge { background: #3b82f6; }

.domain-card.d6 { border-color: rgba(139,92,246,0.3); }
.domain-card.d6:hover { border-color: rgba(139,92,246,0.7); box-shadow: 0 12px 40px rgba(139,92,246,0.15); }
.domain-card.d6 .play-badge { background: #8b5cf6; }

.domain-card.d7 { border-color: rgba(236,72,153,0.3); }
.domain-card.d7:hover { border-color: rgba(236,72,153,0.7); box-shadow: 0 12px 40px rgba(236,72,153,0.15); }
.domain-card.d7 .play-badge { background: #ec4899; }

.domain-card.d8 { border-color: rgba(20,184,166,0.3); }
.domain-card.d8:hover { border-color: rgba(20,184,166,0.7); box-shadow: 0 12px 40px rgba(20,184,166,0.15); }
.domain-card.d8 .play-badge { background: #14b8a6; }

/* ── Game Page Layout ── */
.game-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

.game-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.game-header h1 {
  font-size: 2.2rem;
  margin-bottom: 0.25rem;
}

.game-header .game-subtitle {
  color: rgba(255,255,255,0.6);
  font-size: 1.05rem;
}

.game-controls {
  text-align: center;
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.reset-btn {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff;
  border: none;
  padding: 0.7rem 2rem;
  font-size: 1rem;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 15px rgba(102,126,234,0.4);
}

.reset-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102,126,234,0.6);
}

.back-btn {
  background: rgba(255,255,255,0.1);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.2);
  padding: 0.7rem 2rem;
  font-size: 1rem;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.2s;
}

.back-btn:hover {
  background: rgba(255,255,255,0.2);
}

.score-display {
  text-align: center;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.score-display span {
  color: #4ade80;
}

.completion-message {
  text-align: center;
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  background: linear-gradient(135deg, rgba(34,197,94,0.2), rgba(16,185,129,0.2));
  border: 2px solid #22c55e;
  border-radius: 12px;
  font-size: 1.3rem;
  font-weight: 700;
  color: #4ade80;
  display: none;
}

.game-area {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.terms-column, .scenarios-column {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.column-header {
  font-size: 1.2rem;
  font-weight: 700;
  text-align: center;
  padding: 0.75rem;
  background: rgba(255,255,255,0.08);
  border-radius: 10px;
  margin-bottom: 0.25rem;
  letter-spacing: 0.5px;
}

.term-box {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff;
  padding: 1rem 1.25rem;
  border-radius: 10px;
  cursor: grab;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  font-weight: 700;
  text-align: center;
  font-size: 1.05rem;
  user-select: none;
}

.term-box:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.term-box.dragging {
  opacity: 0.5;
  cursor: grabbing;
}

.scenario-box {
  background: rgba(255,255,255,0.04);
  border: 2px dashed rgba(255,255,255,0.2);
  padding: 1.25rem;
  border-radius: 12px;
  min-height: 90px;
  transition: all 0.3s;
}

.scenario-box.drag-over {
  background: rgba(102,126,234,0.15);
  border-color: #667eea;
  transform: scale(1.01);
}

.scenario-text {
  color: rgba(255,255,255,0.6);
  font-size: 0.95rem;
  line-height: 1.6;
  font-style: italic;
}

.scenario-box.correct {
  background: rgba(34,197,94,0.12);
  border-color: #22c55e;
  border-style: solid;
}

.scenario-box.correct .term-box {
  background: linear-gradient(135deg, #22c55e, #16a34a);
  cursor: default;
}

.term-box.incorrect {
  animation: shake 0.5s;
  background: linear-gradient(135deg, #ef4444, #dc2626);
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-10px); }
  75% { transform: translateX(10px); }
}

/* ── Footer ── */
footer {
  text-align: center;
  padding: 2rem;
  color: rgba(255,255,255,0.35);
  font-size: 0.85rem;
}

footer a {
  color: rgba(255,255,255,0.5);
  text-decoration: none;
}

footer a:hover {
  color: #fff;
}

.footer-disclaimer {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  opacity: 0.5;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .hero h1 { font-size: 2.2rem; }
  .game-area { grid-template-columns: 1fr; }
  .game-header h1 { font-size: 1.6rem; }
  nav .nav-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 0.5rem 0;
    gap: 0.5rem;
  }
  nav .nav-links { flex-wrap: wrap; }
}