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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, sans-serif;
  background: #f5f7fa;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 560px;
  margin: 0 auto;
  padding: 20px;
}

header {
  text-align: center;
  padding: 48px 0 28px;
}

header h1 {
  font-size: 1.75rem;
  color: #1a1a2e;
}

header p {
  color: #666;
  font-size: 15px;
}

.input-row {
  display: flex;
  gap: 10px;
}

#email {
  flex: 1;
  min-width: 0;
  padding: 14px 16px;
  border: 2px solid #dde2ea;
  border-radius: 10px;
  font-size: 16px;
  background: white;
  transition: border-color 0.15s;
}

#email:focus {
  outline: none;
  border-color: #4a6cf7;
}

#verify-btn {
  padding: 14px 26px;
  border: none;
  border-radius: 10px;
  background: #4a6cf7;
  color: white;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
}

#verify-btn:hover {
  background: #3a5ce5;
}

#verify-btn:disabled {
  background: #a0b0f0;
  cursor: default;
}

.hint {
  margin-top: 10px;
  color: #8a93a3;
  font-size: 13px;
  text-align: center;
}

.error {
  margin-top: 20px;
  padding: 12px 16px;
  background: #f8d7da;
  color: #721c24;
  border-radius: 10px;
  font-size: 14px;
}

.card {
  margin-top: 20px;
  padding: 20px;
  background: white;
  border-radius: 12px;
  border-left: 5px solid #c8cdd6;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07);
}

.card.valid { border-left-color: #28a745; }
.card.invalid { border-left-color: #dc3545; }
.card.risky { border-left-color: #ffc107; }

.card.pending {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #666;
  font-size: 15px;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 3px solid #dde2ea;
  border-top-color: #4a6cf7;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
}

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

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.email {
  font-weight: 600;
  font-size: 16px;
  word-break: break-all;
}

.badge {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.badge.valid { background: #d4edda; color: #155724; }
.badge.invalid { background: #f8d7da; color: #721c24; }
.badge.risky { background: #fff3cd; color: #856404; }
.badge.unknown { background: #e2e3e5; color: #383d41; }

.reason {
  margin-top: 10px;
  color: #555;
  font-size: 14px;
}

.details {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid #eef1f5;
  font-size: 13px;
}

.details div {
  display: flex;
  gap: 10px;
  padding: 2px 0;
}

.details dt {
  color: #8a93a3;
  min-width: 110px;
}

.details dd {
  color: #444;
  word-break: break-all;
}

.hidden {
  display: none;
}