html, body {
  height: 100%;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #f5f7fa 0%, #eef2f6 100%);
  color: #1f2937;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.page-shell {
  min-height: 100%;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 48px 16px;
}

.mail-card {
  width: 100%;
  max-width: 860px;
  background: #ffffff;
  border: 1px solid #dde3ea;
  border-radius: 12px;
  padding: 28px 24px;
  box-shadow: 0 10px 26px rgba(16, 24, 40, 0.08);
}

.domain-card {
  max-width: 1040px;
}

.top-action-bar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 8px;
}

.mail-title {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 700;
}

.mail-subtitle {
  margin: 8px 0 24px;
  color: #4b5563;
}

.form-control:focus,
.form-check-input:focus,
.btn:focus {
  box-shadow: 0 0 0 0.18rem rgba(13, 110, 253, 0.2);
}

.analysis-meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.95rem;
  color: #4b5563;
}

.domain-table thead th {
  background: #f3f4f6;
  border-bottom-color: #d9dde3;
  font-weight: 700;
}

.domain-table tbody tr td {
  vertical-align: middle;
}

.status-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
}

.status-pass {
  background: #e9f9ef;
  color: #1f8f42;
}

.status-warn {
  background: #fff6e8;
  color: #cc8200;
}

.status-fail {
  background: #ffecec;
  color: #cf2e2e;
}

.status-info {
  background: #eaf2ff;
  color: #1967d2;
}

@media (max-width: 767px) {
  .mail-card {
    padding: 22px 14px;
  }
}