:root {
  --color-bg: #f4f5f9;
  --color-surface: #ffffff;
  --color-border: #e4e6ef;
  --color-text: #1a1d29;
  --color-text-muted: #6b7080;
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-danger: #e11d48;
  --color-danger-hover: #be123c;
  --color-success: #16a34a;
  --color-warning: #d97706;
  --color-pending: #d97706;
  --color-sending: #2563eb;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 4px 16px rgba(16, 24, 40, 0.08);
  --radius: 12px;
  --radius-sm: 8px;
}

* {
  box-sizing: border-box;
}

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

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.page-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition: all 0.15s ease;
}

.nav-link:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 24px;
  margin-bottom: 20px;
}

.card h2 {
  margin: 0 0 16px;
  font-size: 1.05rem;
  font-weight: 600;
}

.field-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 16px;
}

.field-group label {
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.field-group input[type="text"],
.field-group input[type="number"],
.field-group textarea {
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.15s ease;
  font-family: inherit;
}

.field-group input[type="text"]:focus,
.field-group input[type="number"]:focus,
.field-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-surface);
}

.field-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.file-drop {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  background: var(--color-bg);
}

.file-drop input[type="file"] {
  margin-top: 10px;
  font-size: 0.85rem;
}

button,
.btn {
  padding: 10px 18px;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  transition:
    background 0.15s ease,
    transform 0.05s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

button:hover,
.btn:hover {
  background: var(--color-primary-hover);
}

button:active,
.btn:active {
  transform: scale(0.98);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

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

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

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

.btn-secondary:hover {
  background: var(--color-bg);
}

#uploaded-files {
  margin-top: 4px;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  background: var(--color-bg);
}

.file-name {
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.file-name::before {
  content: "📄";
}

.delete-button {
  padding: 6px 12px;
  font-size: 0.8rem;
  background: var(--color-danger);
}

.delete-button:hover {
  background: var(--color-danger-hover);
}

.empty-state {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 16px;
}

#status-message {
  margin-top: 14px;
  font-weight: 600;
  font-size: 0.9rem;
  min-height: 1.2em;
}

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

/* Queue page */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.stat-tile {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}

.stat-tile .stat-value {
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.2;
}

.stat-tile .stat-label {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

th,
td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--color-bg);
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background: var(--color-bg);
}

.msg {
  max-width: 320px;
  word-break: break-word;
  color: var(--color-text-muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
}

.badge-sent {
  color: var(--color-success);
  background: rgba(22, 163, 74, 0.12);
}

.badge-failed {
  color: var(--color-danger);
  background: rgba(225, 29, 72, 0.12);
}

.badge-pending {
  color: var(--color-pending);
  background: rgba(217, 119, 6, 0.12);
}

.badge-sending {
  color: var(--color-sending);
  background: rgba(37, 99, 235, 0.12);
}

.error-note {
  display: block;
  margin-top: 4px;
  color: var(--color-danger);
  font-size: 0.78rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14151f;
    --color-surface: #1c1e2b;
    --color-border: #2c2e3d;
    --color-text: #eef0f7;
    --color-text-muted: #9296a8;
  }
}