:root {
    --dm-bg: #f5f7fb;
    --dm-surface: #ffffff;
    --dm-border: #d0d7de;
    --dm-text: #1f2937;
    --dm-muted: #6b7280;
    --dm-accent: #3582c0;
    --dm-accent-contrast: #ffffff;
    --dm-card-shadow: 0 8px 18px rgba(15, 23, 42, 0.06);
    --dm-card-shadow-hover: 0 14px 32px rgba(15, 23, 42, 0.12);

    --bs-border-radius: 0;
    --bs-border-radius-sm: 0;
    --bs-border-radius-lg: 0;
    --bs-border-radius-xl: 0;
    --bs-border-radius-xxl: 0;
    --bs-border-radius-pill: 0;
}

html[data-theme="dark"] {
    --dm-bg: #111827;
    --dm-surface: #1f2937;
    --dm-border: #273449;
    --dm-text: #f3f4f6;
    --dm-muted: #9ca3af;
    --dm-accent: #4f9cdb;
    --dm-accent-contrast: #0f172a;
    --dm-card-shadow: 0 12px 22px rgba(2, 6, 23, 0.35);
    --dm-card-shadow-hover: 0 18px 32px rgba(2, 6, 23, 0.45);
}

body {
    background-color: var(--dm-bg);
    color: var(--dm-text);
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.card {
    border-radius: 0;
    border: 1px solid var(--dm-border);
    background-color: var(--dm-surface);
    box-shadow: var(--dm-card-shadow);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

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

.card-body {
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.info-card {
    margin-bottom: 20px;
}

.card-title2 {
    background-color: var(--dm-accent);
    color: var(--dm-accent-contrast);
    text-align: center;
    padding: 14px;
    border-radius: 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.text-center {
    color: var(--dm-accent);
}

.italic-note {
    font-style: italic;
    color: var(--dm-muted);
    margin-top: 10px;
}

.btn-primary.gray {
    background-color: #6c757d;
    border-color: #6c757d;
    color: #fff;
}

.btn-custom,
.btn-custom:hover,
.btn-custom:focus {
    background-color: var(--dm-accent);
    color: var(--dm-accent-contrast);
    border: 1px solid var(--dm-accent);
    border-radius: 0;
    padding: 10px 20px;
    font-size: 14px;
    text-decoration: none;
    text-align: center;
    transition: filter 0.2s ease, transform 0.2s ease;
}

.btn-custom:hover {
    filter: brightness(0.92);
    transform: translateY(-1px);
}

.btn,
.form-control,
.form-select,
.input-group-text,
.modal-content,
.dropdown-menu,
.list-group-item,
.badge,
.alert,
.table,
.nav-pills .nav-link,
.nav-tabs .nav-link,
.progress,
.accordion-button {
    border-radius: 0 !important;
    background-color: var(--dm-surface);
    color: var(--dm-text);
    border-color: var(--dm-border);
}

.dropdown-menu,
.modal-content,
.alert,
.table,
.list-group-item {
    background-color: var(--dm-surface);
    color: var(--dm-text);
}

/* Responsive columns */
.responsive-columns > .col {
    flex: 0 0 100%;
    max-width: 100%;
}

@media (min-width: 768px) {
    .responsive-columns > .col {
        flex: 0 0 50%;
        max-width: 50%;
    }
}

@media (min-width: 1200px) {
    .responsive-columns > .col {
        flex: 0 0 33.3333%;
        max-width: 33.3333%;
    }
}