/* ============================================================
   Mail Sender — Modern, Clean & Mobile-Friendly Admin Theme
   ============================================================ */

:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --surface-hover: #f8fafc;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  
  --text-main: #0f172a;
  --text-mid: #475569;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-soft: #eef2ff;
  --primary-border: #c7d2fe;

  --success: #10b981;
  --success-hover: #059669;
  --success-soft: #ecfdf5;
  --success-border: #a7f3d0;

  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-soft: #fef2f2;
  --danger-border: #fecaca;

  --warning: #f59e0b;
  --warning-hover: #d97706;
  --warning-soft: #fffbeb;
  --warning-border: #fde68a;

  --info: #0ea5e9;
  --info-soft: #f0f9ff;
  --info-border: #bae6fd;

  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
}

html {
  color-scheme: light;
  font-size: 15px;
}

body {
  background-color: var(--bg);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 650;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

/* ---------------- Navbar ---------------- */
.app-navbar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
  padding: 0.75rem 0;
  z-index: 1020;
}

.navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main) !important;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}

.brand-mark svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.nav-link {
  color: var(--text-mid) !important;
  font-weight: 500;
  font-size: 0.92rem;
  padding: 0.5rem 0.85rem !important;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease-in-out;
}

.nav-link:hover {
  color: var(--text-main) !important;
  background: var(--surface-2);
}

.nav-link.active {
  color: var(--primary) !important;
  background: var(--primary-soft);
  font-weight: 600;
}

/* ---------------- Cards ---------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-xs);
  transition: box-shadow 0.15s ease;
}

.card-header {
  background: transparent;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-main);
  padding: 0.9rem 1.25rem;
}

.card-body {
  padding: 1.25rem;
}

/* ---------------- Stat Cards ---------------- */
.stat-card {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-xs);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

.stat-value {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.stat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}
.dot-success { background: var(--success); }
.dot-warning { background: var(--warning); }
.dot-primary { background: var(--primary); }
.dot-info    { background: var(--info); }
.dot-secondary { background: var(--text-light); }

/* ---------------- Tables ---------------- */
.table {
  --bs-table-bg: transparent;
  --bs-table-color: var(--text-main);
  margin-bottom: 0;
}

.table thead th {
  background: var(--surface-2);
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border) !important;
  padding: 0.75rem 1rem;
  white-space: nowrap;
}

.table td {
  border-bottom: 1px solid var(--border);
  padding: 0.8rem 1rem;
  vertical-align: middle;
}

.table tbody tr:last-child td {
  border-bottom: 0;
}

.table tbody tr:hover td {
  background: var(--surface-hover);
}

/* ---------------- Forms ---------------- */
.form-control, .form-select {
  background-color: var(--surface);
  border: 1px solid var(--border-strong);
  color: var(--text-main);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.85rem;
  font-size: 0.92rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus, .form-select:focus {
  background-color: var(--surface);
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
  color: var(--text-main);
}

.form-label {
  font-weight: 550;
  font-size: 0.86rem;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.form-text {
  color: var(--text-muted) !important;
  font-size: 0.8rem;
  margin-top: 0.35rem;
}

.form-check-input {
  border-color: var(--border-strong);
  width: 1.15em;
  height: 1.15em;
}

.form-check-input:checked {
  background-color: var(--primary);
  border-color: var(--primary);
}

/* ---------------- Buttons ---------------- */
.btn {
  border-radius: var(--radius-sm);
  font-weight: 550;
  font-size: 0.88rem;
  padding: 0.5rem 1rem;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}

.btn-sm {
  padding: 0.32rem 0.75rem;
  font-size: 0.82rem;
}

.btn-primary {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(79, 70, 229, 0.2);
}
.btn-primary:hover, .btn-primary:focus {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  color: #ffffff;
}

.btn-success {
  background-color: var(--success);
  border-color: var(--success);
  color: #ffffff;
}
.btn-success:hover {
  background-color: var(--success-hover);
  border-color: var(--success-hover);
  color: #ffffff;
}

.btn-outline-secondary {
  color: var(--text-mid);
  border-color: var(--border-strong);
  background: var(--surface);
}
.btn-outline-secondary:hover {
  background: var(--surface-2);
  color: var(--text-main);
  border-color: var(--text-muted);
}

.btn-outline-primary {
  color: var(--primary);
  border-color: var(--primary-border);
  background: var(--surface);
}
.btn-outline-primary:hover {
  background: var(--primary-soft);
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline-danger {
  color: var(--danger);
  border-color: var(--danger-border);
  background: var(--surface);
}
.btn-outline-danger:hover {
  background: var(--danger-soft);
  color: var(--danger);
  border-color: var(--danger);
}

.btn-outline-warning {
  color: var(--warning);
  border-color: var(--warning-border);
  background: var(--surface);
}
.btn-outline-warning:hover {
  background: var(--warning-soft);
  color: var(--warning-hover);
  border-color: var(--warning);
}

.btn-outline-success {
  color: var(--success);
  border-color: var(--success-border);
  background: var(--surface);
}
.btn-outline-success:hover {
  background: var(--success-soft);
  color: var(--success-hover);
  border-color: var(--success);
}

/* ---------------- Badges ---------------- */
.badge {
  font-weight: 600;
  font-size: 0.75rem;
  padding: 0.35em 0.7em;
  border-radius: 9999px;
  letter-spacing: 0.02em;
}

.badge-status {
  text-transform: capitalize;
}

.text-bg-success {
  background-color: var(--success-soft) !important;
  color: #065f46 !important;
  border: 1px solid var(--success-border);
}

.text-bg-danger {
  background-color: var(--danger-soft) !important;
  color: #991b1b !important;
  border: 1px solid var(--danger-border);
}

.text-bg-warning {
  background-color: var(--warning-soft) !important;
  color: #92400e !important;
  border: 1px solid var(--warning-border);
}

.text-bg-primary, .text-bg-dark {
  background-color: var(--primary-soft) !important;
  color: #3730a3 !important;
  border: 1px solid var(--primary-border);
}

.text-bg-secondary {
  background-color: var(--surface-2) !important;
  color: var(--text-mid) !important;
  border: 1px solid var(--border);
}

/* ---------------- Alerts ---------------- */
.alert {
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  padding: 0.85rem 1.15rem;
  border: 1px solid transparent;
  box-shadow: var(--shadow-xs);
}

.alert-success { background: var(--success-soft); border-color: var(--success-border); color: #065f46; }
.alert-warning { background: var(--warning-soft); border-color: var(--warning-border); color: #92400e; }
.alert-danger  { background: var(--danger-soft); border-color: var(--danger-border); color: #991b1b; }
.alert-info    { background: var(--info-soft); border-color: var(--info-border); color: #075985; }

/* ---------------- Modals ---------------- */
.modal-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.modal-header {
  border-bottom: 1px solid var(--border);
  padding: 1.1rem 1.5rem;
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  border-top: 1px solid var(--border);
  padding: 1rem 1.5rem;
}

/* ---------------- Helper Components ---------------- */
.tag-pill {
  cursor: pointer;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  color: var(--text-mid);
  font-family: monospace;
  font-size: 0.78rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
  user-select: none;
  display: inline-block;
  margin: 0.15rem;
}

.tag-pill:hover {
  background: var(--primary-soft);
  color: var(--primary);
  border-color: var(--primary-border);
}

code {
  color: var(--primary);
  background: var(--primary-soft);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.85em;
}

/* ---------------- Responsive & Mobile Optimizations ---------------- */
@media (max-width: 991.98px) {
  .app-navbar .navbar-collapse {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    margin-top: 0.75rem;
    box-shadow: var(--shadow-md);
  }
  .app-navbar .nav-link {
    padding: 0.6rem 0.8rem !important;
  }
}

@media (max-width: 767.98px) {
  html {
    font-size: 14px;
  }
  .card-body {
    padding: 1rem;
  }
  .stat-value {
    font-size: 1.4rem;
  }
  .table thead th, .table td {
    padding: 0.6rem 0.75rem;
  }
  .btn {
    padding: 0.45rem 0.8rem;
  }
}

/* Custom scrollbars */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; }
::-webkit-scrollbar-track { background: transparent; }