:root {
  --bg: #f3f5f9;
  --surface: #ffffff;
  --surface-muted: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #475569;
  --primary: #0067b8;
  --primary-hover: #00559b;
  --success-bg: #ecfdf5;
  --success-text: #065f46;
  --success-border: #a7f3d0;
  --warn-bg: #fffbeb;
  --warn-text: #92400e;
  --warn-border: #fde68a;
  --error-bg: #fef2f2;
  --error-text: #991b1b;
  --error-border: #fecaca;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.center-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  width: 100%;
}

.invite-card {
  max-width: 460px;
}

.brand-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.ms-logo {
  width: 36px;
  height: 36px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px;
  flex-shrink: 0;
}

.ms-logo span:nth-child(1) { background: #f25022; border-radius: 2px; }
.ms-logo span:nth-child(2) { background: #7fba00; border-radius: 2px; }
.ms-logo span:nth-child(3) { background: #00a4ef; border-radius: 2px; }
.ms-logo span:nth-child(4) { background: #ffb900; border-radius: 2px; }

h1 {
  font-size: 1.35rem;
  margin: 0;
  font-weight: 700;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin: 4px 0 18px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-muted);
  color: var(--text-muted);
}

.pill.ok {
  background: var(--success-bg);
  color: var(--success-text);
  border-color: var(--success-border);
}

.pill.warn {
  background: var(--warn-bg);
  color: var(--warn-text);
  border-color: var(--warn-border);
}

.pill.err {
  background: var(--error-bg);
  color: var(--error-text);
  border-color: var(--error-border);
}

.form-group {
  margin-bottom: 14px;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="url"],
select,
textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  background: #fff;
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 103, 184, 0.15);
}

button {
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn-secondary {
  background: #e2e8f0;
  color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
  background: #cbd5e1;
}

.btn-danger {
  background: #fee2e2;
  color: #991b1b;
}

.btn-danger:hover:not(:disabled) {
  background: #fecaca;
}

.btn-sm {
  padding: 6px 10px;
  font-size: 0.82rem;
}

.btn-full {
  width: 100%;
  padding: 12px 16px;
}

.alert {
  padding: 12px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  margin-top: 14px;
  border: 1px solid transparent;
}

.alert.success {
  background: var(--success-bg);
  color: var(--success-text);
  border-color: var(--success-border);
}

.alert.error {
  background: var(--error-bg);
  color: var(--error-text);
  border-color: var(--error-border);
}

.alert.info {
  background: var(--warn-bg);
  color: var(--warn-text);
  border-color: var(--warn-border);
}

.footer-links {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

.footer-links a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* Admin Layout */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 600;
}

.stat-value {
  font-size: 1.7rem;
  font-weight: 700;
  margin-top: 4px;
}

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

th {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-muted);
  background: var(--surface-muted);
}

.actions-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.hidden {
  display: none !important;
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.83rem;
}

/* Loading Spinner & Progress */
.progress-box {
  margin-top: 16px;
  padding: 16px;
  border-radius: 10px;
  background: var(--surface-muted);
  border: 1px solid var(--border);
  text-align: center;
}

.spinner-ring {
  width: 44px;
  height: 44px;
  margin: 0 auto 10px;
  border: 4px solid #dbeafe;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.85s linear infinite;
}

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

.progress-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.86rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

.progress-track {
  width: 100%;
  height: 8px;
  background: #e2e8f0;
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--primary);
  border-radius: 999px;
  transition: width 0.35s ease;
}