:root {
  --primary: #2E5D7A;
  --secondary: #4A90B8;
  --accent: #7CE38B;
  --warning: #FFB84D;
  --danger: #FF6B6B;
  --snow: #F0F8FF;
  --ice: #B0E0E6;
  --crystal: #87CEEB;
  --bg: #E8F4F8;
  --text: #1A3A4A;
  --text-light: #6B8E9E;
  --border: #C5E1EA;
  --card-bg: #FFFFFF;
  --shadow: rgba(46, 93, 122, 0.1);
  --gold: #FFD700;
  --silver: #C0C0C0;
  --bronze: #CD7F32;
  --platinum: #E5E4E2;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(180deg, var(--bg) 0%, var(--snow) 100%);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  padding-bottom: 60px;
}

header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  padding: 1.5rem;
  box-shadow: 0 4px 12px var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
  overflow: hidden;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

h1 {
  font-size: 1.8rem;
  font-weight: 700;
}

.tabs {
  background: white;
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
  box-shadow: 0 2px 8px var(--shadow);
  position: sticky;
  top: 80px;
  z-index: 99;
  flex-wrap: wrap;
}

.tab {
  background: transparent;
  border: 2px solid var(--border);
  padding: 0.75rem 1.5rem;
  border-radius: 25px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--text);
}

.tab:hover {
  background: var(--snow);
  border-color: var(--secondary);
}

.tab.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.tab-info {
  background: var(--accent);
  color: #1a5929;
  border-color: var(--accent);
}

.tab-info:hover {
  background: #90EE90;
  border-color: #90EE90;
}

main {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.card {
  background: var(--card-bg);
  border-radius: 15px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 15px var(--shadow);
  transition: transform 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--shadow);
}

/* Collection Banner */
.collection-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--crystal) 100%);
  color: white;
  padding: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  overflow: hidden;
  position: relative;
}

.banner-content {
  flex: 1;
  z-index: 1;
}

.banner-mascot {
  flex-shrink: 0;
  z-index: 0;
}

.mascot-character {
  font-size: 12rem;
  line-height: 1;
  opacity: 0.7;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
  animation: mascot-bounce 3s ease-in-out infinite;
}

@keyframes mascot-bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.level-display {
  display: flex;
  gap: 2rem;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.level-badge {
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  padding: 1.5rem 2rem;
  border-radius: 15px;
  text-align: center;
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.level-number {
  display: block;
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
}

.level-label {
  display: block;
  font-size: 0.9rem;
  opacity: 0.9;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.progress-info {
  flex: 1;
  min-width: 250px;
}

.progress-bar-container {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 25px;
  height: 30px;
  overflow: hidden;
  margin-bottom: 0.5rem;
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.progress-bar {
  background: linear-gradient(90deg, var(--accent) 0%, #90EE90 100%);
  height: 100%;
  transition: width 0.5s ease;
  border-radius: 25px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.progress-text {
  font-size: 0.95rem;
  opacity: 0.95;
  text-align: center;
  margin-bottom: 0;
}

.collection-stats {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.stat {
  text-align: center;
  background: rgba(255, 255, 255, 0.15);
  padding: 1rem 1.5rem;
  border-radius: 10px;
  min-width: 120px;
}

.stat-value {
  display: block;
  font-size: 2rem;
  font-weight: 900;
}

.stat-label {
  display: block;
  font-size: 0.85rem;
  opacity: 0.9;
}

/* Prize Progress */
.prize-progress {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
}

.prize-goal {
  background: rgba(255, 255, 255, 0.15);
  padding: 1rem;
  border-radius: 10px;
}

.prize-goal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.prize-goal-label {
  font-weight: 700;
}

.prize-goal-value {
  opacity: 0.9;
}

.prize-bar {
  background: linear-gradient(90deg, #ffd700 0%, #ffed4e 100%);
}

/* Program Reminder */
.program-reminder {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  text-align: center;
  padding: 1rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.program-reminder p {
  margin: 0;
  font-size: 1rem;
}

/* Friends Grid */
.collection-intro {
  text-align: center;
  font-size: 1.1rem;
  margin-bottom: 2rem;
  color: var(--text-light);
}

.tier-section {
  margin-bottom: 2.5rem;
}

.tier-title {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  display: inline-block;
}

.tier-title.snow-tier {
  background: linear-gradient(135deg, #E0F7FF 0%, #B8E6FF 100%);
  color: var(--primary);
}

.tier-title.ice-tier {
  background: linear-gradient(135deg, #C5E9FF 0%, #87CEEB 100%);
  color: var(--primary);
}

.tier-title.crystal-tier {
  background: linear-gradient(135deg, #B8E0FF 0%, #7FB8D4 100%);
  color: white;
}

.tier-title.legendary-tier {
  background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
  color: white;
}

.friends-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1.5rem;
}

.friend-card {
  background: var(--snow);
  border-radius: 15px;
  padding: 1.5rem;
  text-align: center;
  border: 3px solid var(--border);
  transition: all 0.3s ease;
  cursor: pointer;
}

.friend-card.unlocked {
  border-color: var(--accent);
  animation: unlockPulse 0.6s ease;
}

.friend-card.locked {
  opacity: 0.5;
  filter: grayscale(100%);
}

.friend-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 20px var(--shadow);
}

@keyframes unlockPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.friend-icon {
  font-size: 5rem;
  display: block;
  margin-bottom: 0.5rem;
}

.friend-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.friend-unlock {
  font-size: 0.85rem;
  color: var(--text-light);
}

.friend-unlocked-badge {
  display: block;
  color: var(--text-light);
  font-size: 0.8rem;
  font-weight: 400;
  margin-top: 0.5rem;
  font-style: italic;
}

/* Achievements */
#achievementsList {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1.5rem;
}

.achievement-card {
  background: var(--snow);
  border-radius: 15px;
  padding: 1.5rem;
  text-align: center;
  border: 3px solid var(--border);
  transition: all 0.3s ease;
  cursor: pointer;
}

.achievement-card.unlocked {
  border-color: var(--gold);
  background: linear-gradient(135deg, #FFF9E6 0%, #FFEED9 100%);
  animation: unlockPulse 0.6s ease;
}

.achievement-card.locked {
  opacity: 0.5;
  filter: grayscale(100%);
}

.achievement-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 20px var(--shadow);
}

.achievement-icon {
  font-size: 4rem;
  display: block;
  margin-bottom: 0.5rem;
}

.achievement-name {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.achievement-desc {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.achievement-tier {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
}

.achievement-tier.bronze { background: var(--bronze); color: white; }
.achievement-tier.silver { background: var(--silver); color: var(--text); }
.achievement-tier.gold { background: var(--gold); color: var(--text); }
.achievement-tier.platinum { background: var(--platinum); color: var(--text); }

/* Forms */
form {
  display: grid;
  gap: 1rem;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

input, textarea, select {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.3s ease;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--secondary);
}

button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

button:hover {
  background: var(--secondary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

button:active {
  transform: translateY(0);
}

button.danger {
  background: var(--danger);
}

button.danger:hover {
  background: #ff5252;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

/* Toolbar */
.toolbar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.toolbar button {
  flex: 1;
  min-width: 120px;
  font-size: 0.9rem;
  padding: 0.6rem 1rem;
}

/* Stats */
.stats {
  display: flex;
  gap: 2rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  padding: 1rem;
  background: var(--snow);
  border-radius: 10px;
}

.stats div {
  font-size: 1rem;
}

.stats strong {
  color: var(--primary);
  font-size: 1.5rem;
}

/* Table */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

thead {
  background: var(--primary);
  color: white;
}

th, td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

tbody tr:hover {
  background: var(--snow);
}

tbody button {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

/* Modal */
body.modal-open {
  overflow: hidden;
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.3s ease;
  overflow-y: auto;
}

.modal[hidden] {
  display: none;
}

.modal-content {
  background: white;
  border-radius: 20px;
  padding: 2rem;
  max-width: 700px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  text-align: center;
  animation: slideUp 0.4s ease;
  position: relative;
}

@media (min-width: 768px) {
  .modal-content {
    padding: 3rem;
    max-width: 900px;
  }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(50px); }
  to { opacity: 1; transform: translateY(0); }
}

.celebration {
  background: linear-gradient(135deg, #FFF9E6 0%, #E6F7FF 100%);
  border: 4px solid var(--gold);
}

.achievement-unlock {
  background: linear-gradient(135deg, #FFE6E6 0%, #FFE6F0 100%);
  border: 4px solid var(--gold);
}

.confetti {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
}

.confetti::before, .confetti::after {
  content: '🎉';
  position: absolute;
  font-size: 2rem;
  animation: fall 3s linear infinite;
}

.confetti::before {
  left: 20%;
  animation-delay: 0.5s;
}

.confetti::after {
  left: 70%;
  animation-delay: 1.5s;
}

@keyframes fall {
  0% { top: -50px; opacity: 1; transform: rotate(0deg); }
  100% { top: 100%; opacity: 0; transform: rotate(360deg); }
}

.unlocked-friend, .unlocked-achievement {
  margin: 2rem 0;
}

.friend-icon-large, .achievement-icon-large {
  font-size: 7rem;
  animation: bounce 0.6s ease infinite alternate;
}

@keyframes bounce {
  from { transform: translateY(0); }
  to { transform: translateY(-10px); }
}

.unlocked-friend h3, .unlocked-achievement h3 {
  font-size: 2rem;
  margin: 1rem 0 0.5rem;
  color: var(--primary);
}

.unlocked-friend p, .unlocked-achievement p {
  font-size: 1.1rem;
  color: var(--text-light);
  font-style: italic;
}

/* Hints */
.hint {
  font-size: 0.85rem;
  color: var(--text-light);
  text-align: center;
  margin-top: 1rem;
}

.muted {
  color: var(--text-light);
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-light);
}

/* Responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 1.4rem;
  }

  .tabs {
    top: 70px;
  }

  .tab {
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
  }

  .card {
    padding: 1.5rem;
  }

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

  .collection-stats {
    gap: 1rem;
  }

  .stat {
    min-width: 100px;
  }

  .friends-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
  }

  .friend-icon {
    font-size: 3.5rem;
  }

  .toolbar {
    flex-direction: column;
  }

  .toolbar button {
    width: 100%;
  }

  table {
    font-size: 0.85rem;
  }

  th, td {
    padding: 0.5rem;
  }

  .modal-content {
    padding: 2rem;
  }

  .friend-icon-large, .achievement-icon-large {
    font-size: 5rem;
  }

  .collection-banner {
    flex-direction: column;
    text-align: center;
  }

  .banner-mascot {
    order: -1; /* Move mascot above content on mobile */
  }

  .mascot-character {
    font-size: 6rem; /* Smaller on mobile */
  }

  #achievementsList {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
  }

  .achievement-icon {
    font-size: 3rem;
  }
}

/* Child Selector */
.header-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.child-selector {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.1);
  padding: 0.5rem 1rem;
  border-radius: 25px;
  backdrop-filter: blur(10px);
}

.child-selector label {
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
}

.child-selector select {
  background: white;
  color: var(--text);
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  min-width: 150px;
}

.btn-small {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: white;
}

.btn-small:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.5);
}

/* Registration Modal */
.add-child-form {
  display: flex;
  gap: 0.5rem;
  margin: 1.5rem 0;
}

.add-child-form input {
  flex: 1;
}

.add-child-form button {
  flex-shrink: 0;
}

#childrenList {
  margin: 1rem 0;
  max-height: 300px;
  overflow-y: auto;
}

.child-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--snow);
  border-radius: 8px;
  margin-bottom: 0.5rem;
}

.child-item span {
  font-weight: 600;
  color: var(--text);
}

.btn-remove {
  background: var(--danger);
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

.btn-remove:hover {
  background: #ff5252;
}

.modal-actions {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
}

.modal-actions button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.modal-actions button:disabled:hover {
  transform: none;
  background: var(--primary);
}

.modal-footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 2px solid var(--border);
  text-align: center;
}

.btn-danger-small {
  background: var(--danger);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  opacity: 0.7;
  transition: opacity 0.3s ease;
}

.btn-danger-small:hover {
  opacity: 1;
  background: #ff5252;
}

/* Sync Info Box */
.sync-info-box {
  background: linear-gradient(135deg, #e3f2fd 0%, #e1f5fe 100%);
  border-left: 4px solid var(--secondary);
  padding: 1rem 1.25rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
}

.sync-info-box strong {
  display: block;
  color: var(--primary);
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.sync-info-box p {
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0;
}

/* Sync Status Badges */
.sync-badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: 12px;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
}

.sync-badge.synced {
  background: #e8f5e9;
  color: #2e7d32;
}

.sync-badge.unsynced {
  background: #fff3e0;
  color: #f57c00;
}

/* Sync Button with Count */
#syncBtn.has-unsynced {
  background: var(--warning);
  animation: pulse 2s ease-in-out infinite;
  position: relative;
}

#syncBtn.has-unsynced:hover {
  background: #ff9800;
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(255, 184, 77, 0.7);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(255, 184, 77, 0);
  }
}

/* Loading state */
.loading {
  text-align: center;
  padding: 2rem;
  color: var(--text-light);
}

.loading::after {
  content: '...';
  animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
  0%, 20% { content: '.'; }
  40% { content: '..'; }
  60%, 100% { content: '...'; }
}

/* Floating Frosty Friends Decorations */
.floating-friends {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 0;
}

.header-content {
  position: relative;
  z-index: 1;
}

.float-friend {
  position: absolute;
  font-size: 2rem;
  opacity: 0.3;
  animation: float 6s ease-in-out infinite;
}

.float-1 {
  left: 10%;
  top: 20%;
  animation-delay: 0s;
}

.float-2 {
  right: 15%;
  top: 40%;
  animation-delay: 1s;
}

.float-3 {
  left: 80%;
  top: 60%;
  animation-delay: 2s;
}

.float-4 {
  right: 5%;
  top: 10%;
  animation-delay: 1.5s;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  25% {
    transform: translateY(-15px) rotate(5deg);
  }
  50% {
    transform: translateY(-10px) rotate(-5deg);
  }
  75% {
    transform: translateY(-20px) rotate(3deg);
  }
}

/* Add winter sparkle to cards */
.card {
  position: relative;
}

.card h2 {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

/* Page corner decorations */
.page-decorations {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 50;
}

.corner-friend {
  position: absolute;
  font-size: 3rem;
  opacity: 0.15;
  animation: gentle-spin 20s linear infinite;
}

.top-left {
  top: 100px;
  left: 10px;
}

.top-right {
  top: 100px;
  right: 10px;
  animation-direction: reverse;
}

@keyframes gentle-spin {
  0% {
    transform: rotate(0deg) scale(1);
  }
  50% {
    transform: rotate(180deg) scale(1.1);
  }
  100% {
    transform: rotate(360deg) scale(1);
  }
}