:root {
    --sre-bg: #f8fafc;       /* slate-50 background claro */
    --sre-card: #ffffff;     /* blanco puro para cards */
    --sre-accent: #3b82f6;   /* blue-500 se mantiene porque queda bien */
    --sre-danger: #ef4444;   /* red-500 */
    --sre-success: #10b981;  /* emerald-500 */
    --sre-text: #1e293b;     /* texto principal oscuro */
    --sre-text-muted: #64748b; /* texto secundario */
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--sre-bg) !important;
    color: var(--sre-text) !important;
}

/* Colores personalizados Retro SDO */
.sre-bg { background-color: var(--sre-bg) !important; }
.sre-card { background-color: var(--sre-card) !important; }
.text-accent { color: var(--sre-accent) !important; }

/* Botones Neon / Accent */
.btn-accent {
    background-color: var(--sre-accent);
    color: #fff;
    border: none;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.3);
    transition: all 0.3s ease;
}
.btn-accent:hover {
    background-color: #2563eb;
    color: #fff;
    box-shadow: 0 6px 15px rgba(59, 130, 246, 0.4);
}

.btn-outline-accent {
    background-color: transparent;
    color: var(--sre-accent);
    border: 1px solid var(--sre-accent);
    transition: all 0.3s ease;
}
.btn-outline-accent:hover {
    background-color: var(--sre-accent);
    color: #fff;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.3);
}

/* Navbar */
.sre-navbar {
    background-color: rgba(255, 255, 255, 0.9) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

/* Glassmorphism Cards (adaptado a light mode) */
.bg-glass-primary {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(59, 130, 246, 0.02) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2) !important;
    backdrop-filter: blur(10px);
}
.bg-glass-success {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(16, 185, 129, 0.02) 100%);
    border: 1px solid rgba(16, 185, 129, 0.2) !important;
    backdrop-filter: blur(10px);
}
.bg-glass-danger {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(239, 68, 68, 0.02) 100%);
    border: 1px solid rgba(239, 68, 68, 0.2) !important;
    backdrop-filter: blur(10px);
}

.shadow-neon {
    box-shadow: 0 5px 15px rgba(59, 130, 246, 0.15) !important;
}

.shadow-text {
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Pestañas (Mobile scrollable) */
.nav-scroll-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Firefox */
}
.nav-scroll-wrapper::-webkit-scrollbar {
    display: none; /* Chrome/Safari/Edge */
}
.whitespace-nowrap {
    white-space: nowrap;
}

.nav-pills .nav-link {
    color: var(--sre-text-muted);
    font-weight: 500;
}
.nav-pills .nav-link.active {
    background-color: var(--sre-accent);
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.3);
}

/* Menú Contextual */
.menu-contextual {
    display: none;
    position: absolute;
    border-radius: 10px;
    overflow: hidden;
    z-index: 1050;
    min-width: 150px;
    background-color: var(--sre-card) !important;
    border: 1px solid rgba(0,0,0,0.1);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}
.menu-contextual ul {
    list-style: none;
}
.menu-contextual ul li {
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.2s ease;
    color: var(--sre-text);
}
.menu-contextual ul li:hover {
    background-color: rgba(0,0,0,0.05);
}

/* Transiciones y Acordeones */
.accordion-button {
    color: var(--sre-text);
}
.accordion-button:not(.collapsed) {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--sre-accent);
    box-shadow: none;
}
.accordion-button:focus {
    box-shadow: none;
}

.cursor-pointer {
    cursor: pointer;
}

.card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.08) !important;
}

/* Inputs Checkbox Switch Retro */
.form-switch .form-check-input {
    background-color: #cbd5e1;
    border-color: #94a3b8;
}
.form-switch .form-check-input:checked {
    background-color: var(--sre-success);
    border-color: var(--sre-success);
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.3);
}

/* Botones de Selección de Usuarios (Checkbox en Formularios) */
.btn-user-select {
    background-color: #f8fafc; /* bg-light equivalente */
    color: var(--sre-text);
    border: 1px solid #cbd5e1; /* gris suave para encajar con el borde de inputs */
    transition: all 0.2s ease;
}
.btn-user-select:hover {
    background-color: #e2e8f0;
    color: var(--sre-text);
}
.btn-check:checked + .btn-user-select {
    background-color: var(--sre-success);
    color: #ffffff;
    border-color: var(--sre-success);
    box-shadow: 0 4px 10px rgba(16, 185, 129, 0.3);
}

/* SweetAlert Theme Customization */
.swal2-popup {
    background-color: var(--sre-card) !important;
    color: var(--sre-text) !important;
    border-radius: 15px !important;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1) !important;
}
.swal2-title, .swal2-html-container {
    color: var(--sre-text) !important;
}

/* Custom Avatars */
.avatar-grid-img {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid var(--sre-danger); /* Por defecto rojo (pendiente) */
    box-shadow: 0 4px 10px rgba(239, 68, 68, 0.3);
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.avatar-grid-img.pagado {
    border-color: var(--sre-success); /* Verde (pagado) */
    box-shadow: 0 4px 10px rgba(16, 185, 129, 0.3);
}

.user-grid-item {
    transition: all 0.3s ease;
    border: 1px solid rgba(0,0,0,0.05);
    background-color: var(--sre-card);
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}

.user-grid-item:hover .avatar-grid-img {
    transform: scale(1.1);
}

.user-grid-item:hover .avatar-grid-img:not(.pagado) {
    box-shadow: 0 6px 15px rgba(239, 68, 68, 0.5);
}

.user-grid-item:hover .avatar-grid-img.pagado {
    box-shadow: 0 6px 15px rgba(16, 185, 129, 0.5);
}

.user-grid-item:active {
    transform: scale(0.95);
}

.offcanvas-bottom {
    background-color: var(--sre-bg) !important;
    border-top: 1px solid rgba(0,0,0,0.05);
    box-shadow: 0 -5px 25px rgba(0,0,0,0.1);
}