:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --navbar-bg: #ffffff;
    --navbar-text: #212529;
    --card-shadow: rgba(0, 0, 0, 0.1);
    --input-bg: #ffffff;
    --input-border: #ced4da;
    --table-bg: #ffffff;
    --table-striped: #f8f9fa;
    --table-hover: #e9ecef;
    --badge-bg-sent: #17a2b8;
    --badge-bg-viewed: #ffc107;
    --badge-bg-signed: #28a745;
    --badge-bg-expired: #6c757d;
    --badge-bg-bounced: #dc3545;
    --alert-info-bg: #d1ecf1;
    --alert-info-border: #bee5eb;
    --alert-info-text: #0c5460;
    --modal-bg: #ffffff;
    --modal-backdrop: rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] {
    --bg-primary: #1a1d23;
    --bg-secondary: #2c3038;
    --bg-card: #242831;
    --text-primary: #e9ecef;
    --text-secondary: #adb5bd;
    --text-muted: #6c757d;
    --border-color: #3a3f4b;
    --navbar-bg: #1a1d23;
    --navbar-text: #e9ecef;
    --card-shadow: rgba(0, 0, 0, 0.3);
    --input-bg: #2c3038;
    --input-border: #3a3f4b;
    --table-bg: #242831;
    --table-striped: #2c3038;
    --table-hover: #3a3f4b;
    --badge-bg-sent: #17a2b8;
    --badge-bg-viewed: #ffc107;
    --badge-bg-signed: #28a745;
    --badge-bg-expired: #6c757d;
    --badge-bg-bounced: #dc3545;
    --alert-info-bg: #1b4954;
    --alert-info-border: #1e5a67;
    --alert-info-text: #b8daff;
    --modal-bg: #242831;
    --modal-backdrop: rgba(0, 0, 0, 0.7);
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.navbar {
    background-color: var(--navbar-bg) !important;
    color: var(--navbar-text) !important;
    border-bottom: 1px solid var(--border-color);
}

.navbar-brand,
.nav-link {
    color: var(--navbar-text) !important;
}

.card {
    background-color: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-color);
    box-shadow: 0 4px 6px var(--card-shadow);
}

.form-control,
.form-select {
    background-color: var(--input-bg);
    color: var(--text-primary);
    border-color: var(--input-border);
}

.form-control:focus,
.form-select:focus {
    background-color: var(--input-bg);
    color: var(--text-primary);
    border-color: var(--input-border);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.table {
    background-color: var(--table-bg);
    color: var(--text-primary);
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: var(--table-striped);
}

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

.modal-content {
    background-color: var(--modal-bg);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.modal-header,
.modal-footer {
    border-color: var(--border-color);
}

.dropdown-menu {
    background-color: var(--bg-card);
    border-color: var(--border-color);
}

.dropdown-item {
    color: var(--text-primary);
}

.dropdown-item:hover {
    background-color: var(--table-hover);
}

.text-muted {
    color: var(--text-secondary) !important;
}

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

.btn-outline-secondary {
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-outline-secondary:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.list-group-item {
    background-color: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-color);
}

#theme-toggle {
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

#theme-toggle:hover {
    background-color: var(--bg-secondary);
}

#theme-toggle i {
    font-size: 1.25rem;
}

@media (prefers-reduced-motion: reduce) {
    body,
    .card,
    .form-control,
    .form-select,
    #theme-toggle {
        transition: none !important;
    }
}