* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    background: #f0f2f5;
    color: #333;
    line-height: 1.6;
}

/* ===== LOGIN ===== */
.login-body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1a237e, #283593);
    padding: 16px;
}

.login-box {
    background: #fff;
    padding: 32px 24px;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    color: #1a237e;
    text-align: center;
    font-size: 22px;
    margin-bottom: 4px;
}

.login-box h2 {
    text-align: center;
    font-size: 16px;
    color: #666;
    margin-bottom: 24px;
    font-weight: 400;
}

/* ===== NAVBAR ===== */
.navbar {
    background: linear-gradient(135deg, #1a237e, #283593);
    padding: 0 16px;
    color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    min-height: 52px;
}

.nav-brand {
    color: #fff;
    text-decoration: none;
    font-size: 20px;
    font-weight: 700;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 26px;
    cursor: pointer;
    padding: 4px 8px;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 4px;
}

.nav-menu li a {
    color: #c5cae9;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 13px;
    transition: all 0.2s;
    white-space: nowrap;
}

.nav-menu li a:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
}

.btn-logout {
    background: rgba(244,67,54,0.2);
    color: #ef9a9a !important;
}

.btn-logout:hover {
    background: rgba(244,67,54,0.4) !important;
    color: #fff !important;
}

/* ===== LAYOUT ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    gap: 12px;
    flex-wrap: wrap;
}

.page-header h1 {
    font-size: 20px;
    color: #1a237e;
}

.dashboard-header h1 {
    font-size: 24px;
    color: #1a237e;
}

.dashboard-header p {
    color: #666;
    margin-bottom: 16px;
}

/* ===== CARDS ===== */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.card {
    background: #fff;
    border-radius: 8px;
    padding: 16px;
    display: flex;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-2px);
}

.card-icon {
    font-size: 32px;
    margin-right: 14px;
}

.card-body h3 {
    font-size: 12px;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-number {
    font-size: 22px;
    font-weight: 700;
    margin-top: 2px;
}

.card-primary .card-number { color: #1a237e; }
.card-success .card-number { color: #2e7d32; }
.card-warning .card-number { color: #f57f17; }
.card-danger .card-number { color: #c62828; }
.card-info .card-number { color: #0277bd; }

/* ===== TABLE ===== */
.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 16px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.table {
    width: 100%;
    background: #fff;
    border-collapse: collapse;
    min-width: 600px;
}

.table th {
    background: #1a237e;
    color: #fff;
    padding: 10px 12px;
    text-align: left;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.table td {
    padding: 8px 12px;
    border-bottom: 1px solid #eee;
    font-size: 13px;
}

.table tr:hover {
    background: #f5f5f5;
}

.table tr:last-child td {
    border-bottom: none;
}

/* ===== BADGES ===== */
.badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    white-space: nowrap;
}

.badge-activo, .badge-normal { background: #e8f5e9; color: #2e7d32; }
.badge-pagado, .badge-total { background: #e3f2fd; color: #0277bd; }
.badge-vencido, .badge-atraso { background: #fff3e0; color: #e65100; }
.badge-cancelado { background: #ffebee; color: #c62828; }
.badge-aumento { background: #e8f5e9; color: #2e7d32; }
.badge-disminucion { background: #ffebee; color: #c62828; }
.badge-asignacion { background: #e3f2fd; color: #0277bd; }
.badge-info { background: #e3f2fd; color: #0277bd; }
.badge-success { background: #e8f5e9; color: #2e7d32; }
.badge-danger { background: #ffebee; color: #c62828; }

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 8px 14px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    text-decoration: none;
    color: #333;
    background: #e0e0e0;
    transition: all 0.2s;
    text-align: center;
}

.btn:hover {
    opacity: 0.85;
}

.btn-primary { background: #1a237e; color: #fff; }
.btn-success { background: #2e7d32; color: #fff; }
.btn-warning { background: #f57f17; color: #fff; }
.btn-danger { background: #c62828; color: #fff; }

.btn-sm {
    padding: 4px 8px;
    font-size: 11px;
}

.btn-full {
    width: 100%;
    padding: 12px;
    font-size: 15px;
}

.btn-active {
    background: #1a237e;
    color: #fff;
}

.actions {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

/* ===== SECTIONS ===== */
.section {
    margin-top: 20px;
}

.section h2 {
    font-size: 18px;
    color: #1a237e;
    margin-bottom: 10px;
}

/* ===== FORMS ===== */
.form {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    max-width: 600px;
    width: 100%;
}

.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 5px;
    font-size: 13px;
    color: #444;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #1a237e;
    box-shadow: 0 0 0 3px rgba(26,35,126,0.1);
}

.form-group textarea {
    min-height: 80px;
    resize: vertical;
}

.total-display {
    font-size: 22px;
    font-weight: 700;
    color: #1a237e;
    padding: 10px;
    background: #f0f2f5;
    border-radius: 4px;
    text-align: center;
}

/* ===== ALERTS ===== */
.alert {
    padding: 10px 14px;
    border-radius: 4px;
    margin-bottom: 14px;
    font-size: 13px;
}

.alert-error {
    background: #ffebee;
    color: #c62828;
    border: 1px solid #ef9a9a;
}

.alert-success {
    background: #e8f5e9;
    color: #2e7d32;
    border: 1px solid #a5d6a7;
}

.alert-info {
    background: #e3f2fd;
    color: #0277bd;
    border: 1px solid #90caf9;
}

/* ===== DETAIL GRID ===== */
.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
    background: #fff;
    padding: 16px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.detail-grid div {
    padding: 6px 0;
    font-size: 13px;
}

.detail-grid strong {
    color: #555;
}

/* ===== SEARCH & FILTER ===== */
.search-form {
    display: flex;
    gap: 8px;
    margin-bottom: 14px;
    flex-wrap: wrap;
    align-items: flex-end;
}

.search-form input[type="text"] {
    flex: 1;
    min-width: 180px;
    padding: 9px 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 13px;
}

.search-form label {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: #555;
    white-space: nowrap;
}

.search-form input[type="date"] {
    padding: 7px 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 12px;
}

.filter-bar {
    display: flex;
    gap: 6px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

/* ===== TEXT ===== */
.text-center {
    text-align: center;
    padding: 16px !important;
    color: #999;
}

/* ===== FOOTER ===== */
.footer {
    text-align: center;
    padding: 16px;
    color: #999;
    font-size: 12px;
}

/* ===== SIMULACION WRAPPER ===== */
.form-simulacion-wrapper {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    flex-wrap: wrap;
}

.form-simulacion-wrapper .form {
    flex: 1;
    min-width: 280px;
}

.simulacion-panel {
    flex: 1.5;
    min-width: 300px;
    background: #fff;
    padding: 16px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.simulacion-panel h2 {
    font-size: 16px;
    color: #1a237e;
    margin-bottom: 14px;
}

.simulacion-panel .cards {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 8px;
    margin-bottom: 10px;
}

.simulacion-panel .card {
    padding: 12px;
}

.simulacion-panel .card-body h3 {
    font-size: 10px;
}

.simulacion-panel .card-number {
    font-size: 16px;
}

.whatsapp-area {
    margin-top: 12px;
    text-align: center;
}

.btn-whatsapp {
    background: #25D366;
    color: #fff;
    font-size: 15px;
    padding: 12px 24px;
    width: 100%;
}

.btn-whatsapp:hover {
    background: #1da851;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 52px;
        left: 0;
        right: 0;
        background: #1a237e;
        padding: 8px 16px;
        gap: 2px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    }

    .nav-menu.open {
        display: flex;
    }

    .nav-menu li a {
        display: block;
        padding: 10px 12px;
        font-size: 14px;
    }

    .navbar {
        position: relative;
    }

    .container {
        padding: 12px;
    }

    .page-header h1 {
        font-size: 18px;
    }

    .dashboard-header h1 {
        font-size: 20px;
    }

    .cards {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
        gap: 10px;
    }

    .card-number {
        font-size: 18px;
    }

    .card-icon {
        font-size: 28px;
    }

    .table-wrapper {
        margin-left: -12px;
        margin-right: -12px;
        border-radius: 0;
    }

    .table th,
    .table td {
        padding: 8px 10px;
        font-size: 12px;
    }

    .form {
        padding: 16px;
    }

    .detail-grid {
        grid-template-columns: 1fr;
        padding: 12px;
    }

    .search-form {
        flex-direction: column;
        align-items: stretch;
    }

    .search-form input[type="text"] {
        min-width: auto;
    }

    .search-form label {
        white-space: normal;
    }

    .form-simulacion-wrapper {
        flex-direction: column;
    }

    .form-simulacion-wrapper .form,
    .simulacion-panel {
        min-width: auto;
        width: 100%;
    }

    .simulacion-panel .cards {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
}

@media (max-width: 480px) {
    .login-box {
        padding: 24px 16px;
    }

    .login-box h1 {
        font-size: 18px;
    }

    .cards {
        grid-template-columns: 1fr 1fr;
    }

    .card {
        padding: 12px;
    }

    .card-number {
        font-size: 16px;
    }

    .page-header {
        flex-direction: column;
        align-items: stretch;
    }

    .page-header .btn {
        width: 100%;
    }

    .filter-bar .btn {
        font-size: 11px;
        padding: 6px 10px;
    }
}