:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #12122a;
  --text-primary: #ffffff;
  --text-secondary: #a0a0c0;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: rgba(0, 0, 0, 0.3);
  --accent-1: #ff6b6b;
  --accent-2: #ffd93d;
  --accent-3: #6bcb77;
  --accent-4: #4d96ff;
  --accent-5: #9b59b6;
  --gradient-main: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-warm: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-cool: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-success: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
}

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

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  background-image:
    radial-gradient(
      ellipse at 10% 20%,
      rgba(102, 126, 234, 0.15) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 90% 80%,
      rgba(118, 75, 162, 0.15) 0%,
      transparent 50%
    ),
    radial-gradient(ellipse at 50% 50%, rgba(0, 0, 0, 0.3) 0%, transparent 100%);
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  box-shadow: 0 8px 32px var(--glass-shadow);
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 32px;
  height: 64px;
  border-bottom: 1px solid var(--glass-border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: var(--transition-smooth);
}
.nav-brand:hover {
  transform: scale(1.02);
}

.brand-icon {
  font-size: 1.8rem;
}
.brand-text {
  font-size: 1.3rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 32px;
}
.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition-smooth);
  position: relative;
}
.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  transition: var(--transition-smooth);
}
.nav-links a:hover {
  color: var(--text-primary);
}
.nav-links a:hover::after {
  width: 100%;
}

.nav-user {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  transition: var(--transition-smooth);
}

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

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #eef2ff;
  --text-primary: #111827;
  --text-secondary: #475569;
  --glass-bg: rgba(255, 255, 255, 0.82);
  --glass-border: rgba(148, 163, 184, 0.18);
  --glass-shadow: rgba(15, 23, 42, 0.08);
  --gradient-main: linear-gradient(135deg, #5b21b6 0%, #3b82f6 100%);
  --gradient-warm: linear-gradient(135deg, #f97316 0%, #f59e0b 100%);
  --gradient-cool: linear-gradient(135deg, #0ea5e9 0%, #22d3ee 100%);
  --gradient-success: linear-gradient(135deg, #14b8a6 0%, #2dd4bf 100%);
}

.xp-display,
.level-display {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  font-size: 0.85rem;
  font-weight: 600;
}
.xp-icon {
  color: var(--accent-2);
}
.xp-label {
  color: var(--text-secondary);
  font-weight: 400;
}
.level-badge {
  background: var(--gradient-main);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.8rem;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

#mainContent {
  padding-top: 80px;
  padding-bottom: 80px;
  min-height: 100vh;
}

.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  padding: 12px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--glass-border);
  z-index: 1000;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== HERO ===== */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 24px 60px;
  min-height: calc(100vh - 160px);
}

.hero-badge {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  font-size: 0.85rem;
  color: var(--accent-2);
  margin-bottom: 24px;
  animation: fadeInDown 0.6s ease;
}

.hero h1 {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 16px;
  animation: fadeInUp 0.6s ease 0.1s both;
}
.hero h1 .gradient-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 40px;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.btn-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  animation: fadeInUp 0.6s ease 0.3s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border: none;
  border-radius: 50px;
  font-family: "Inter", sans-serif;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  text-decoration: none;
  color: var(--text-primary);
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(102, 126, 234, 0.3);
}
.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--gradient-main);
  color: white;
}
.btn-secondary {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-4);
}
.btn-success {
  background: var(--gradient-success);
  color: #0a0a1a;
}
.btn-danger {
  background: linear-gradient(135deg, #f5576c, #ff6b6b);
}
.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}
.btn-icon {
  padding: 12px;
  border-radius: 12px;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ===== FEATURES ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(274px, 1fr));
  gap: 20px;
  padding: 40px 0;
}

.feature-card {
  padding: 32px;
  border-radius: var(--border-radius-md);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  text-align: center;
  transition: var(--transition-smooth);
  cursor: default;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(102, 126, 234, 0.3);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: block;
}
.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== MODES ===== */
.page-header {
  text-align: center;
  padding: 40px 24px 20px;
}
.page-header h1 {
  font-size: 2.5rem;
  margin-bottom: 8px;
}
.page-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.modes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  padding: 40px 0;
}

.mode-card {
  padding: 36px;
  border-radius: var(--border-radius-lg);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  text-align: center;
  transition: var(--transition-smooth);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.mode-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  opacity: 0;
  transition: var(--transition-smooth);
}
.mode-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
}
.mode-card:hover::before {
  opacity: 1;
}

.mode-card:nth-child(1)::before {
  background: var(--gradient-main);
}
.mode-card:nth-child(2)::before {
  background: var(--gradient-warm);
}
.mode-card:nth-child(3)::before {
  background: var(--gradient-cool);
}
.mode-card:nth-child(4)::before {
  background: linear-gradient(135deg, #fa709a, #fee140);
}
.mode-card:nth-child(5)::before {
  background: linear-gradient(135deg, #a18cd1, #fbc2eb);
}

.mode-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  display: block;
}
.mode-card h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}
.mode-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 20px;
}
.mode-difficulty {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}
.difficulty-easy {
  background: rgba(107, 203, 119, 0.2);
  color: var(--accent-3);
}
.difficulty-medium {
  background: rgba(255, 217, 61, 0.2);
  color: var(--accent-2);
}
.difficulty-hard {
  background: rgba(255, 107, 107, 0.2);
  color: var(--accent-1);
}

/* ===== GAMEPLAY ===== */
.game-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px;
}

.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-radius: var(--border-radius-md);
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.game-stats {
  display: flex;
  gap: 20px;
  align-items: center;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 12px;
  background: var(--glass-bg);
  font-size: 0.85rem;
  font-weight: 500;
}
.stat-item .stat-value {
  font-weight: 700;
  font-size: 1.1rem;
}
.stat-timer .stat-value {
  color: var(--accent-2);
}
.stat-score .stat-value {
  color: var(--accent-4);
}
.stat-combo .stat-value {
  color: var(--accent-3);
}
.stat-accuracy .stat-value {
  color: var(--accent-1);
}
.stat-question .stat-value {
  color: var(--accent-5);
}

.timer-warning {
  animation: pulse 0.5s ease infinite;
  color: var(--accent-1) !important;
}

.game-area {
  padding: 32px;
  border-radius: var(--border-radius-lg);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  min-height: 400px;
}

.game-prompt {
  text-align: center;
  margin-bottom: 32px;
}
.game-prompt h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}
.game-prompt p {
  color: var(--text-secondary);
}

.color-display {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.color-swatch {
  width: 120px;
  height: 120px;
  border-radius: var(--border-radius-md);
  border: 3px solid var(--glass-border);
  transition: var(--transition-smooth);
  position: relative;
  cursor: pointer;
}
.color-swatch:hover {
  transform: scale(1.05);
  border-color: rgba(255, 255, 255, 0.3);
}
.color-swatch .color-label {
  position: absolute;
  bottom: -28px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.8rem;
  font-family: "JetBrains Mono", monospace;
  color: var(--text-secondary);
  white-space: nowrap;
}

.color-options {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.color-option {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--border-radius-sm);
  border: 3px solid transparent;
  cursor: pointer;
  transition: var(--transition-smooth);
  position: relative;
}
.color-option:hover {
  transform: scale(1.1);
  border-color: rgba(255, 255, 255, 0.4);
}
.color-option.selected {
  border-color: var(--accent-2);
  box-shadow: 0 0 20px rgba(255, 217, 61, 0.4);
}
.color-option.correct {
  border-color: var(--accent-3);
  box-shadow: 0 0 20px rgba(107, 203, 119, 0.4);
  animation: popCorrect 0.4s ease;
}
.color-option.wrong {
  border-color: var(--accent-1);
  box-shadow: 0 0 20px rgba(255, 107, 107, 0.4);
  animation: shake 0.4s ease;
}

/* ===== COLOR WHEEL ===== */
.color-wheel-container {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}
.color-wheel-container canvas {
  border-radius: 50%;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.3);
  cursor: crosshair;
}

.color-info {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.color-info-item {
  padding: 12px 20px;
  border-radius: var(--border-radius-sm);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  text-align: center;
  min-width: 140px;
}
.color-info-item .label {
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.color-info-item .value {
  font-size: 1rem;
  font-weight: 600;
  font-family: "JetBrains Mono", monospace;
  margin-top: 4px;
}

/* ===== GRADIENT BUILDER ===== */
.gradient-preview {
  width: 100%;
  height: 80px;
  border-radius: var(--border-radius-md);
  margin-bottom: 24px;
  border: 2px solid var(--glass-border);
}

.gradient-stops {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.gradient-stop {
  width: 60px;
  height: 60px;
  border-radius: var(--border-radius-sm);
  border: 3px solid var(--glass-border);
  cursor: pointer;
  transition: var(--transition-smooth);
  position: relative;
}
.gradient-stop.active {
  border-color: var(--accent-2);
  transform: scale(1.1);
}
.gradient-stop .stop-remove {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-1);
  border: none;
  color: white;
  font-size: 0.7rem;
  cursor: pointer;
  display: none;
}
.gradient-stop:hover .stop-remove {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== DRAG & DROP ===== */
.palette-container {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  padding: 20px;
  background: var(--glass-bg);
  border-radius: var(--border-radius-md);
  border: 2px dashed var(--glass-border);
  min-height: 100px;
  transition: var(--transition-smooth);
}
.palette-container.drag-over {
  border-color: var(--accent-4);
  background: rgba(77, 150, 255, 0.05);
}

.palette-item {
  width: 70px;
  height: 70px;
  border-radius: var(--border-radius-sm);
  cursor: grab;
  transition: var(--transition-smooth);
  position: relative;
}
.palette-item:active {
  cursor: grabbing;
}
.palette-item.dragging {
  opacity: 0.5;
  transform: scale(0.9);
}

/* ===== RESULT ===== */
.result-container {
  max-width: 600px;
  margin: 40px auto;
  text-align: center;
}

.result-score {
  font-size: 5rem;
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 16px 0;
}

.result-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 32px 0;
}

.result-stat {
  padding: 20px;
  border-radius: var(--border-radius-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}
.result-stat .label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.result-stat .value {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 4px;
}

.result-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== LEADERBOARD ===== */
.leaderboard-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 24px;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
}
.leaderboard-table th {
  padding: 12px 16px;
  text-align: left;
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
  border-bottom: 1px solid var(--glass-border);
}
.leaderboard-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--glass-border);
  font-size: 0.95rem;
}
.leaderboard-table tr:hover td {
  background: rgba(255, 255, 255, 0.03);
}
.leaderboard-table .rank {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent-2);
}
.leaderboard-table .rank-1 {
  color: #ffd700;
}
.leaderboard-table .rank-2 {
  color: #c0c0c0;
}
.leaderboard-table .rank-3 {
  color: #cd7f32;
}

/* ===== MODAL / OVERLAY ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  animation: fadeIn 0.2s ease;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: var(--border-radius-lg);
  padding: 32px;
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  animation: scaleIn 0.3s ease;
}
.modal-content h2 {
  margin-bottom: 16px;
}
.modal-content .close-btn {
  float: right;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ===== INPUTS ===== */
input[type="text"],
input[type="color"],
select {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--border-radius-sm);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-family: "Inter", sans-serif;
  font-size: 0.95rem;
  transition: var(--transition-smooth);
}
input[type="text"]:focus,
select:focus {
  outline: none;
  border-color: var(--accent-4);
  box-shadow: 0 0 0 3px rgba(77, 150, 255, 0.2);
}
input[type="color"] {
  height: 50px;
  padding: 4px;
  cursor: pointer;
}

/* ===== SAVED PALETTES ===== */
.palettes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.saved-palette {
  padding: 16px;
  border-radius: var(--border-radius-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}
.saved-palette .palette-name {
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 0.9rem;
}
.saved-palette .palette-colors {
  display: flex;
  gap: 4px;
  margin-bottom: 8px;
}
.saved-palette .palette-colors span {
  flex: 1;
  height: 30px;
  border-radius: 4px;
}
.saved-palette .palette-actions {
  display: flex;
  gap: 8px;
}
.saved-palette .palette-actions button {
  flex: 1;
  padding: 4px;
  font-size: 0.75rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

/* ===== DAILY CHALLENGE ===== */
.daily-card {
  padding: 32px;
  border-radius: var(--border-radius-lg);
  background: linear-gradient(
    135deg,
    rgba(102, 126, 234, 0.15),
    rgba(118, 75, 162, 0.15)
  );
  border: 2px solid rgba(102, 126, 234, 0.3);
  text-align: center;
  margin: 32px 0;
  position: relative;
  overflow: hidden;
}
.daily-card::before {
  content: "★ DAILY CHALLENGE ★";
  position: absolute;
  top: 8px;
  right: -30px;
  background: var(--gradient-main);
  padding: 4px 40px;
  font-size: 0.7rem;
  font-weight: 700;
  transform: rotate(45deg);
  letter-spacing: 2px;
}
.daily-card .daily-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}
.daily-card .daily-colors {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 16px 0;
}
.daily-card .daily-colors span {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  border: 2px solid var(--glass-border);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}
@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}
@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-8px);
  }
  75% {
    transform: translateX(8px);
  }
}
@keyframes popCorrect {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}
@keyframes glow {
  0%,
  100% {
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
  }
  50% {
    box-shadow: 0 0 40px rgba(102, 126, 234, 0.6);
  }
}

.float-anim {
  animation: float 3s ease-in-out infinite;
}

/* ===== LOADING ===== */
.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--glass-border);
  border-top-color: var(--accent-4);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 40px auto;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===== HEX INPUT ===== */
.hex-input-group {
  display: flex;
  gap: 8px;
  align-items: center;
}
.hex-input-group input[type="text"] {
  flex: 1;
  font-family: "JetBrains Mono", monospace;
  text-transform: uppercase;
}

/* ===== TOAST ===== */
.toast {
  position: fixed;
  top: 80px;
  right: 24px;
  padding: 12px 24px;
  border-radius: var(--border-radius-sm);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  font-weight: 500;
  z-index: 3000;
  animation: slideIn 0.3s ease;
}
.toast-success {
  border-color: var(--accent-3);
}
.toast-error {
  border-color: var(--accent-1);
}
.toast-info {
  border-color: var(--accent-4);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .navbar {
    padding: 12px 16px;
  }
  .nav-links {
    display: none;
  }
  .nav-toggle {
    display: block;
  }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--glass-border);
    padding: 16px;
    gap: 12px;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .game-header {
    flex-direction: column;
    align-items: stretch;
  }
  .game-stats {
    justify-content: center;
  }
  .game-area {
    padding: 20px;
  }
  .color-swatch {
    width: 80px;
    height: 80px;
  }
  .result-score {
    font-size: 3rem;
  }
  .modes-grid {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .color-options {
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }
  .btn {
    padding: 10px 20px;
    font-size: 0.9rem;
  }
  .result-stats {
    grid-template-columns: 1fr;
  }
}