:root {
  --bg: #f3f4f6;
  --card-bg: #ffffff;
  --text: #1f2933;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --success-bg: #ecfdf5;
  --success-text: #047857;
  --error-bg: #fef2f2;
  --error-text: #b91c1c;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

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

.page {
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 32px 16px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  padding: 32px;
  width: 100%;
  max-width: 480px;
}

h1 {
  margin-top: 0;
  font-size: 1.5rem;
}

.lede {
  color: var(--muted);
  margin-top: -8px;
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: #fff;
  color: var(--text);
}

input:focus, select:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

fieldset.category {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px 16px;
  margin: 0 0 16px;
}

fieldset.category legend {
  font-weight: 600;
  padding: 0 6px;
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  cursor: pointer;
}

.checkbox-row input[type="checkbox"] {
  margin-top: 3px;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.checkbox-row span {
  display: flex;
  flex-direction: column;
}

.checkbox-row small {
  color: var(--muted);
  font-weight: 400;
}

.checkbox-row.inline {
  display: inline-flex;
  align-items: center;
  padding: 0;
}

.list-checkbox:disabled {
  opacity: 0.5;
}

textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  resize: vertical;
  min-height: 160px;
}

textarea.hidden-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.email-preview {
  width: 100%;
  height: 420px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  margin: 16px 0;
}

button, .link-btn {
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
}

button[type="submit"], form button:not(.link-btn):not(.secondary) {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 12px 20px;
  border-radius: 8px;
  font-weight: 600;
  width: 100%;
}

button[type="submit"]:hover, form button:not(.link-btn):not(.secondary):hover {
  background: var(--primary-dark);
}

button[type="submit"]:disabled {
  opacity: 0.6;
  cursor: default;
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.actions button {
  width: auto;
  flex: 1 1 auto;
}

.actions button.secondary {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--border);
}

.actions button.secondary:hover {
  background: #f9fafb;
}

.link-btn {
  display: inline-block;
  margin-top: 12px;
  background: none;
  border: none;
  color: var(--primary);
  text-decoration: underline;
  padding: 0;
}

.link-btn.danger {
  color: #b91c1c;
}

.message {
  margin-top: 12px;
  font-size: 0.95rem;
  min-height: 1.2em;
}

.message.success, p.success {
  background: var(--success-bg);
  color: var(--success-text);
  padding: 10px 14px;
  border-radius: 8px;
}

.message.error, p.error {
  background: var(--error-bg);
  color: var(--error-text);
  padding: 10px 14px;
  border-radius: 8px;
}

.muted, p.muted {
  color: var(--muted);
}

/* Admin layout */
.admin-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.admin-nav {
  background: #111827;
  color: #fff;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.admin-nav-brand {
  font-weight: 700;
}

.admin-nav-links a {
  color: #d1d5db;
  text-decoration: none;
  margin-left: 18px;
  font-size: 0.92rem;
}

.admin-nav-links a:first-child {
  margin-left: 0;
}

.admin-nav-links a:hover {
  color: #fff;
}

.admin-content {
  padding: 24px;
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin: 16px 0 32px;
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-num {
  font-size: 1.8rem;
  font-weight: 700;
}

.stat-label {
  color: var(--muted);
  font-size: 0.85rem;
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  min-width: 480px;
}

.admin-table th, .admin-table td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  white-space: nowrap;
}

.admin-table th {
  background: #f9fafb;
  font-weight: 600;
}

.admin-table tr:last-child td {
  border-bottom: none;
}

.actions-cell {
  display: flex;
  align-items: center;
  gap: 12px;
}

.inline-form {
  display: inline;
}

.admin-form {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 24px;
  max-width: 480px;
}

.admin-form button {
  width: auto;
  margin-right: 10px;
}

.admin-form.campaign-form,
.admin-form.campaign-confirm-form {
  max-width: 720px;
}

.admin-filter-form {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 16px;
}

.admin-filter-form select {
  width: auto;
}

.admin-filter-form button {
  width: auto;
}

@media (max-width: 600px) {
  .card {
    padding: 24px 18px;
  }

  .admin-content {
    padding: 16px;
  }

  .admin-nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .admin-nav-links a {
    margin-left: 0;
    margin-right: 16px;
  }
}