:root {
    --primary-color: #005dab;
    --primary-hover: #004080;
    --accent-color: #FF6B35;
    --secondary-color: #64748b;
    --success-color: #059669;
    --danger-color: #dc2626;
    --warning-color: #d97706;
    --light-bg: #f8fafc;
    --border-color: #e2e8f0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--light-bg);
    color: #334155;
    line-height: 1.75;
}

/* Header Styles */
.navbar {
    background-color: var(--primary-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1.25rem 0 !important;
}

.navbar .container {
    display: flex !important;
    align-items: center !important;
    flex-wrap: nowrap !important;
}

.navbar-brand {
    padding: 0 !important;
    margin: 0 3rem 0 0 !important;
    display: flex !important;
    align-items: center !important;
    line-height: 1 !important;
}

.navbar-brand span {
    line-height: 1 !important;
    display: inline-block;
    vertical-align: middle;
}

.navbar-collapse {
    display: flex !important;
    align-items: center !important;
    flex-grow: 1 !important;
}

.navbar-nav {
    display: flex !important;
    flex-direction: row !important;
    align-items: center !important;
    margin: 0 !important;
    padding: 0 !important;
}

.navbar-nav.ms-auto {
    margin-left: auto !important;
}

.navbar-nav .nav-item {
    display: flex !important;
    align-items: center !important;
    margin: 0 !important;
    padding: 0 !important;
}

.navbar-nav .nav-link {
    color: rgba(255,255,255,0.9) !important;
    font-weight: 500 !important;
    margin: 0 0.5rem !important;
    padding: 0.5rem 1rem !important;
    transition: color 0.2s !important;
    display: flex !important;
    align-items: center !important;
    line-height: 1 !important;
    border: none !important;
    background: none !important;
}

.navbar-nav .nav-link:hover {
    color: white !important;
}

.navbar-nav .nav-link.active {
    color: white !important;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 4px !important;
}

.dropdown-toggle::after {
    margin-left: 0.5rem !important;
}

.dropdown-menu {
    margin-top: 0.5rem !important;
}

.dropdown-toggle::after {
    margin-left: 0.5rem;
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 140px);
    padding: 2rem 0;
}

.page-header {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border-left: 4px solid var(--primary-color);
}

.page-title {
    margin: 0;
    color: #1e293b;
    font-weight: 600;
}

/* Breadcrumbs */
.breadcrumb {
    background-color: transparent;
    padding: 0.5rem 0 1rem 0;
    margin-bottom: 0;
    font-size: 1.4rem;
    line-height: 1.6;
}

.breadcrumb-item {
    color: #64748b;
    font-size: 1.4rem;
}

.breadcrumb-item.active {
    color: #1e293b;
    font-weight: 500;
}

.breadcrumb-item a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 1.4rem;
}

.breadcrumb-item a:hover {
    text-decoration: underline;
}

/* Cards */
.card {
    border: none;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 1.5rem;
}

.card-header {
    background: white;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    color: #1e293b;
}

/* Buttons */
.btn {
    border-radius: 6px;
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: all 0.2s;
}

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

.btn-primary:hover {
    background-color: #1d4ed8;
    border-color: #1d4ed8;
    transform: translateY(-1px);
}

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

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

/* Cancel/Secondary button - ensure proper rectangular appearance */
.btn-outline-secondary {
    background-color: #fff;
    border: 1px solid #6c757d;
    color: #6c757d;
    padding: 0.5rem 1.25rem;
    height: auto;
    line-height: 1.5;
}

.btn-outline-secondary:hover {
    background-color: #6c757d;
    border-color: #6c757d;
    color: #fff;
}

.btn-lg {
    padding: 0.65rem 1.5rem;
    font-size: 1.1rem;
    height: auto;
    line-height: 1.5;
}

/* Tables */
.table {
    background: white;
    border-radius: 8px;
    overflow: hidden;
}

.table thead th {
    background-color: #f8fafc;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    color: #475569;
    padding: 1rem;
}

.table tbody td {
    padding: 1rem;
    border-bottom: 1px solid #f1f5f9;
}

/* Flash Messages */
.alert {
    border-radius: 6px;
    border: none;
    margin-bottom: 1.5rem;
}

.alert-success {
    background-color: #dcfce7;
    color: #166534;
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background-color: #fef2f2;
    color: #991b1b;
    border-left: 4px solid var(--danger-color);
}

/* Forms */
.form-control {
    border-radius: 6px;
    border: 1px solid var(--border-color);
    padding: 0.75rem;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.1);
}

.form-label {
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.5rem;
}

/* Status badges */
.badge { font-size: 0.75rem; padding: 0.4rem 0.8rem; border-radius: 20px; }

.badge.draft { background-color: #fef3c7; color: #92400e; }
.badge.sent { background-color: #d1fae5; color: #065f46; }
.badge.queued { background-color: #dbeafe; color: #1e40af; }
.badge.sending { background-color: #fef3c7; color: #92400e; }
.badge.completed { background-color: #d1fae5; color: #065f46; }

/* Footer */
.footer {
    background: #1e293b;
    color: #94a3b8;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: auto;
}

.footer a {
    color: #cbd5e1;
    text-decoration: none;
}

.footer a:hover {
    color: white;
}

/* Navigation active emphasis and campaign view readability tweaks. */
.navbar-nav .nav-link.active {
    font-weight: 700 !important;
}

.campaign-view .card-header .card-title {
    font-size: 1.25rem !important;
    font-weight: 700 !important;
}

.campaign-view .detail-label {
    font-size: 0.9rem !important;
    font-weight: 700 !important;
    letter-spacing: 0.02em !important;
    color: #334155 !important;
}

/* Align anchor and button elements consistently. */
.btn,
a.btn,
button.btn,
input.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: auto;
    line-height: 1.5;
    margin: 0;
    text-decoration: none;
}

.btn.btn-lg,
a.btn.btn-lg,
button.btn.btn-lg {
    min-height: 44px;
}

.btn.btn-sm,
a.btn.btn-sm,
button.btn.btn-sm {
    min-height: 32px;
}

.btn-row {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 0.75rem;
}

.btn-row > form {
    margin: 0;
}

.form-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-actions .form-hint {
    color: #6b7280;
    font-size: 0.9rem;
}

/* Improve readability for light blue outline buttons. */
.btn-outline-info {
    color: #0b5ed7;
    border-color: #0b5ed7;
    font-weight: 600;
}

.btn-outline-info:hover,
.btn-outline-info:focus-visible {
    background-color: #0b5ed7;
    border-color: #0b5ed7;
    color: #ffffff;
}


/* Responsive adjustments */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem 0;
    }

    .page-header {
        padding: 1rem;
        margin-bottom: 1rem;
    }
}