:root {
  --bg-primary: #1a1a2e;
  --bg-card: #242442;
  --bg-card-hover: #2d2d52;
  --text-primary: #ffffff;
  --text-secondary: #a0a0c0;
  --text-muted: #6b6b8a;
  --accent: #4a9eff;
  --accent-hover: #6ab3ff;
  --accent-light: #1a3a5c;
  --border: #3a3a5c;
  --success: #4ade80;
  --warning: #fbbf24;
  --danger: #f87171;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow: 0 4px 12px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.4);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans TC", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px;
}

/* Header */
.page-header {
  text-align: center;
  padding: 16px 0 24px;
}
.page-header h1 {
  font-size: 1.25rem;
  font-weight: 600;
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover {
  box-shadow: var(--shadow-lg);
}

.card-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* User Info Card */
.user-info {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}
.user-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  flex-shrink: 0;
}
.user-details h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.user-meta {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.stat-item {
  text-align: center;
}
.stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  display: block;
}
.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Referral Code */
.referral-code {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-top: 12px;
}
.referral-code .code {
  font-family: "SF Mono", Monaco, monospace;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  flex: 1;
}
.btn-copy {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}
.btn-copy:hover { background: var(--accent-hover); }
.btn-copy:active { transform: scale(0.98); }

/* Share Link */
.share-link-box {
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-top: 12px;
  word-break: break-all;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}
.share-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  text-decoration: none;
  width: 100%;
}
.btn-primary {
  background: var(--accent);
  color: white;
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

/* Account Info */
.account-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.account-item:last-child { border-bottom: none; }
.account-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}
.account-value {
  font-size: 0.875rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 100px;
  background: rgba(74, 158, 255, 0.15);
  color: var(--accent);
}
.status-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
}

/* Quick Links Grid */
.quick-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.quick-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px 12px;
  background: var(--bg-card-hover);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.2s;
}
.quick-link:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
}
.quick-link-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}
.quick-link-label {
  font-size: 0.8125rem;
  font-weight: 500;
}

/* Disclaimer */
.disclaimer {
  background: rgba(251, 191, 36, 0.08);
  border-left: 3px solid var(--warning);
  padding: 12px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-card);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  z-index: 1000;
  opacity: 0;
  transition: all 0.3s ease;
  border: 1px solid var(--border);
}
.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in {
  animation: fadeIn 0.4s ease forwards;
}

/* Desktop adjustments */
@media (min-width: 768px) {
  .container {
    max-width: 600px;
    padding: 24px;
  }
  .stats-row {
    grid-template-columns: repeat(4, 1fr);
  }
  .quick-links {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }