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

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #10b981;
  --danger: #ef4444;
  --border: #334155;
  --shadow: rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --shadow: rgba(0, 0, 0, 0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

.header {
  background: var(--bg-secondary);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: 0 4px 6px var(--shadow);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  font-weight: 700;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.theme-toggle {
  background: var(--bg-tertiary);
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 20px;
  transition: all 0.3s;
}

.theme-toggle:hover {
  transform: scale(1.05);
}

.email-controls {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.email-display {
  flex: 1;
  min-width: 300px;
  background: var(--bg-tertiary);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 16px;
  font-weight: 600;
  color: var(--accent);
}

.btn {
  background: var(--bg-tertiary);
  border: 2px solid var(--border);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  font-size: 14px;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-success {
  background: var(--success);
  border-color: var(--success);
  color: white;
}

.btn-danger {
  background: var(--danger);
  border-color: var(--danger);
  color: white;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

#statusMsg {
  margin-top: 12px;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  display: none;
}

#statusMsg.success {
  background: rgba(16, 185, 129, 0.2);
  color: var(--success);
  display: block;
}

#statusMsg.error {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger);
  display: block;
}

.main-grid {
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: 20px;
  margin-top: 20px;
}

.panel {
  background: var(--bg-secondary);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 6px var(--shadow);
}

.panel-header {
  padding: 20px 24px;
  border-bottom: 2px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-title {
  font-size: 18px;
  font-weight: 700;
}

.panel-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.inbox-list {
  max-height: 600px;
  overflow-y: auto;
  padding: 12px;
}

.inbox-empty {
  padding: 60px 20px;
  text-align: center;
  color: var(--text-secondary);
}

.email-item {
  background: var(--bg-tertiary);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 12px;
  cursor: pointer;
  transition: all 0.3s;
}

.email-item:hover {
  transform: translateX(4px);
  border-color: var(--accent);
}

.email-item.active {
  border-color: var(--accent);
  background: var(--accent);
  color: white;
}

.email-subject {
  font-weight: 600;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.email-meta {
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.email-item.active .email-meta {
  color: rgba(255,255,255,0.8);
}

.message-header {
  padding: 20px 24px;
  border-bottom: 2px solid var(--border);
}

.message-field {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}

.message-label {
  min-width: 80px;
  font-weight: 600;
  color: var(--text-secondary);
}

.message-value {
  flex: 1;
  word-break: break-word;
}

.message-viewer {
  padding: 24px;
  min-height: 500px;
}

.message-frame {
  width: 100%;
  min-height: 500px;
  border: none;
  background: white;
  border-radius: 12px;
}

.message-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 500px;
  color: var(--text-secondary);
  font-size: 16px;
}

.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-secondary);
  border-radius: 16px;
  padding: 32px;
  max-width: 500px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.modal-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
}

.modal-field {
  margin-bottom: 20px;
}

.modal-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.modal-input, .modal-select {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border: 2px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
}

.modal-select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.modal-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 24px;
}

@media (max-width: 1024px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
  
  .inbox-list {
    max-height: 400px;
  }
}

@media (max-width: 640px) {
  .email-controls {
    flex-direction: column;
  }
  
  .email-display {
    min-width: 100%;
  }
  
  .btn {
    width: 100%;
  }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading {
  opacity: 0.6;
  pointer-events: none;
}

.loading::after {
  content: '';
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-left: 8px;
}