:root {
    --abts-primary: #0f5c5c;
    --abts-primary-dark: #0a4545;
    --abts-accent: #14b8a6;
    --abts-accent-light: #5eead4;
    --abts-sidebar: #0f5c5c;
    --abts-surface: #f4f7f6;
    --abts-card-bg: #ffffff;
    --abts-text: #1e293b;
    --abts-text-muted: #64748b;
    --abts-border: #e2e8f0;
    --abts-radius: 10px;
    --abts-shadow: 0 1px 3px rgba(15, 92, 92, 0.08), 0 4px 12px rgba(15, 92, 92, 0.06);
}

body {
    background-color: var(--abts-surface);
    color: var(--abts-text);
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.main-content {
    background: var(--abts-surface);
    padding: 1rem 1.5rem 1.5rem;
}

.page-container {
    max-width: 1400px;
}

.module-card {
    background: var(--abts-card-bg);
    border: 1px solid var(--abts-border);
    border-radius: var(--abts-radius);
    box-shadow: var(--abts-shadow);
}

.module-card .card-header,
.module-card-header {
    background: transparent;
    border-bottom: 1px solid var(--abts-border);
    font-weight: 600;
    color: var(--abts-primary);
    padding: 1rem 1.25rem;
}

.stat-card {
    background: var(--abts-card-bg);
    border: 1px solid var(--abts-border);
    border-radius: var(--abts-radius);
    box-shadow: var(--abts-shadow);
    padding: 1.25rem;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(15, 92, 92, 0.12);
}

.stat-card h6 {
    color: var(--abts-text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.35rem;
}

.stat-card h4 {
    color: var(--abts-primary);
    font-weight: 700;
    margin: 0;
}

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

.btn-abts-primary:hover,
.btn-abts-primary:focus {
    background-color: var(--abts-primary-dark);
    border-color: var(--abts-primary-dark);
    color: #fff;
}

.btn-abts-accent {
    background-color: var(--abts-accent);
    border-color: var(--abts-accent);
    color: #fff;
}

.btn-abts-accent:hover {
    background-color: #0d9488;
    border-color: #0d9488;
    color: #fff;
}

.table-modern {
    background: var(--abts-card-bg);
    border-radius: var(--abts-radius);
    overflow: hidden;
    box-shadow: var(--abts-shadow);
}

.table-modern thead {
    background: linear-gradient(135deg, var(--abts-primary) 0%, var(--abts-primary-dark) 100%);
    color: #fff;
}

.table-modern thead th {
    border: none;
    font-weight: 600;
    font-size: 0.85rem;
    padding: 0.85rem 1rem;
}

.table-modern tbody td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
    border-color: var(--abts-border);
}

.table-modern tbody tr:hover {
    background-color: rgba(20, 184, 166, 0.06);
}

.page-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--abts-accent);
}

.page-header-bar h4 {
    color: var(--abts-primary);
    font-weight: 700;
    margin: 0;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--abts-accent);
    box-shadow: 0 0 0 0.2rem rgba(20, 184, 166, 0.2);
}

.badge-abts {
    background-color: var(--abts-accent);
    color: #fff;
}

.login-shell {
    min-height: 100vh;
    display: flex;
    align-items: stretch;
}

.login-brand-panel {
    flex: 1;
    background: linear-gradient(145deg, var(--abts-primary) 0%, var(--abts-primary-dark) 55%, #063333 100%);
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 3rem;
    position: relative;
    overflow: hidden;
}

.login-brand-panel::before {
    content: "";
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0.12;
}

.login-brand-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 420px;
}

.login-brand-logo {
    max-height: 88px;
    max-width: 240px;
    object-fit: contain;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.2));
}

.login-form-panel {
    flex: 1;
    max-width: 520px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2.5rem;
    background: #fff;
}

.login-form-card {
    width: 100%;
    max-width: 380px;
}

.login-form-card h2 {
    color: var(--abts-primary);
    font-weight: 700;
}

.login-form-card .text-muted {
    color: var(--abts-text-muted) !important;
}

@media (max-width: 768px) {
    .login-shell {
        flex-direction: column;
    }

    .login-brand-panel {
        min-height: 220px;
        padding: 2rem 1.5rem;
    }

    .login-form-panel {
        max-width: 100%;
    }
}