/* =====================================================
   VARIABLES Y CONFIGURACIÓN GLOBAL
   ===================================================== */
:root {
    --primary-color: #1e3a8a;
    --secondary-color: #dc2626;
    --accent-color: #0891b2;
    --success-color: #16a34a;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    scroll-behavior: smooth;
}

/* =====================================================
   NAVBAR / MENÚ PRINCIPAL
   ===================================================== */
.navbar {
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1030;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff !important;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand i {
    font-size: 2rem;
}

.navbar-nav .nav-link {
    color: #fff !important;
    font-weight: 500;
    transition: all 0.3s ease;
    margin: 0 0.5rem;
}

.navbar-nav .nav-link:hover {
    color: #e0e7ff !important;
    border-bottom: 2px solid var(--accent-color);
}

.navbar-toggler {
    border-color: rgba(255, 255, 255, 0.3);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.55%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* =====================================================
   SECCIÓN EXPLICATIVA
   ===================================================== */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: #fff;
    padding: 4rem 2rem;
    margin: 2rem 0;
    border-radius: 10px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.hero-section h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-section p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 0.5rem;
    opacity: 0.95;
}

.hero-section ul {
    list-style: none;
}

.hero-section ul li {
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

.hero-section ul li i {
    color: #fbbf24;
    margin-right: 0.5rem;
}

/* =====================================================
   SECCIÓN DE FORMULARIO
   ===================================================== */
.form-section {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    margin: 2rem 0;
}

.form-section h2 {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 2rem;
    border-bottom: 3px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

.form-section h2 i {
    margin-right: 0.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    display: block;
}

.form-label .text-danger {
    color: var(--secondary-color);
    margin-left: 0.25rem;
}

.form-control,
.form-select {
    border: 2px solid #e5e7eb;
    border-radius: 6px;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.1);
    outline: none;
}

.form-control.is-invalid,
.form-select.is-invalid {
    border-color: var(--secondary-color);
}

.form-control.is-invalid:focus,
.form-select.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.invalid-feedback {
    display: block;
    color: var(--secondary-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    font-weight: 500;
}

.btn-submit {
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
    border: none;
    color: #fff;
    padding: 0.75rem 2rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
    color: #fff;
}

.btn-submit:active {
    transform: translateY(0);
}

.btn-outline-secondary {
    border: 2px solid #d1d5db;
    color: #4b5563;
    background: #fff;
    padding: 0.75rem 2rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.btn-outline-secondary:hover {
    background: #f3f4f6;
    border-color: #9ca3af;
}

/* =====================================================
   SECCIÓN DE USUARIOS
   ===================================================== */
.users-section {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    margin: 2rem 0;
    margin-bottom: 4rem;
}

.users-section h2 {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 2rem;
    border-bottom: 3px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

.users-section h2 i {
    margin-right: 0.5rem;
}

.user-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #fff 100%);
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.user-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    border-color: var(--accent-color);
}

.user-card h5 {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
    font-size: 1.25rem;
}

.user-card h5 i {
    color: var(--accent-color);
    margin-right: 0.5rem;
}

.user-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.user-info p {
    font-size: 0.95rem;
    margin: 0.25rem 0;
    line-height: 1.6;
}

.user-info strong {
    color: var(--primary-color);
    font-weight: 600;
}

.btn-delete {
    background: var(--secondary-color);
    color: #fff;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.3s ease;
    width: 100%;
}

.btn-delete:hover {
    background: #b91c1c;
    transform: scale(1.02);
}

.btn-delete:active {
    transform: scale(0.98);
}

.btn-delete i {
    margin-right: 0.5rem;
}

.empty-state {
    text-align: center;
    padding: 2rem;
    color: #9ca3af;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
    color: #d1d5db;
}

.empty-state p {
    font-size: 1.1rem;
    margin: 0;
}

/* =====================================================
   MODAL PERSONALIZADO
   ===================================================== */
.modal-header {
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: #fff;
    border: none;
}

.modal-header .modal-title {
    font-weight: 700;
}

.modal-header .modal-title i {
    margin-right: 0.5rem;
}

.modal-header .btn-close {
    filter: brightness(0) invert(1);
    opacity: 0.7;
}

.modal-header .btn-close:hover {
    opacity: 1;
}

.modal-body {
    padding: 2rem;
    font-size: 1rem;
}

.modal-body p {
    margin-bottom: 1rem;
    line-height: 1.6;
}

.modal-body strong {
    color: var(--primary-color);
    font-weight: 700;
}

.alert-info {
    background: #dbeafe;
    border: 1px solid #93c5fd;
    color: #1e40af;
    border-radius: 6px;
    padding: 0.75rem 1rem;
}

.alert-info i {
    margin-right: 0.5rem;
}

.modal-footer {
    padding: 1rem;
    gap: 0.5rem;
    border-top: 1px solid #e5e7eb;
}

.modal-footer .btn {
    padding: 0.5rem 1.5rem;
    font-weight: 600;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.modal-footer .btn-secondary {
    background: #e5e7eb;
    color: #374151;
    border: none;
}

.modal-footer .btn-secondary:hover {
    background: #d1d5db;
}

/* =====================================================
   ALERTAS PERSONALIZADAS
   ===================================================== */
#alertContainer {
    margin-bottom: 2rem;
}

.alert-custom {
    border-radius: 6px;
    border: none;
    padding: 1rem;
    margin-bottom: 1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.alert-success {
    background: #dcfce7;
    color: #166534;
    border-left: 4px solid #22c55e;
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid #ef4444;
}

.alert-custom i {
    font-size: 1.2rem;
    flex-shrink: 0;
}

.alert-custom .btn-close {
    opacity: 0.7;
    color: inherit;
}

.alert-custom .btn-close:hover {
    opacity: 1;
}

/* =====================================================
   CONTENEDOR PRINCIPAL
   ===================================================== */
.container-fluid {
    max-width: 1400px;
    margin: 0 auto;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Secciones con margen para la navbar sticky */
section {
    scroll-margin-top: 100px;
}

/* =====================================================
   UTILIDADES
   ===================================================== */
.d-flex {
    display: flex;
}

.gap-2 {
    gap: 1rem;
}

.row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
    gap: 1.5rem;
}

.col-md-6 {
    grid-column: span 1;
}

.col-lg-6 {
    grid-column: span 1;
}

.col-lg-8 {
    grid-column: span 1;
}

.col-lg-4 {
    grid-column: span 1;
}

.align-items-center {
    display: flex;
    align-items: center;
}

.text-center {
    text-align: center;
}

.me-2 {
    margin-right: 0.5rem;
}

.ms-auto {
    margin-left: auto;
}

.mt-5 {
    margin-top: 3rem;
}

.mt-3 {
    margin-top: 1rem;
}

.mb-1 {
    margin-bottom: 0.25rem;
}

.mb-2 {
    margin-bottom: 0.5rem;
}

.text-danger {
    color: var(--secondary-color);
}

/* =====================================================
   DISEÑO RESPONSIVO
   ===================================================== */
@media (max-width: 1200px) {
    .container {
        padding: 0 1.5rem;
    }
}

@media (max-width: 992px) {
    .hero-section h1 {
        font-size: 2.2rem;
    }

    .form-section,
    .users-section {
        padding: 1.5rem;
    }

    .user-info {
        grid-template-columns: 1fr;
    }

    .row {
        gap: 1rem;
    }
}

@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2rem;
    }

    .hero-section p {
        font-size: 1rem;
    }

    .hero-section ul li {
        font-size: 0.95rem;
    }

    .form-section,
    .users-section {
        padding: 1rem;
    }

    .form-section h2,
    .users-section h2 {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .user-card {
        padding: 1rem;
        margin-bottom: 1rem;
    }

    .user-info {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .user-info p {
        font-size: 0.9rem;
    }

    .btn-submit,
    .btn-outline-secondary {
        padding: 0.625rem 1.5rem;
        font-size: 0.95rem;
        width: 100%;
    }

    .d-flex {
        flex-direction: column;
    }

    .gap-2 {
        gap: 0.5rem;
    }

    .navbar-brand {
        font-size: 1.25rem;
    }

    .navbar-brand i {
        font-size: 1.5rem;
    }

    .col-md-6,
    .col-lg-6,
    .col-lg-8,
    .col-lg-4 {
        grid-column: span 1;
    }
}

@media (max-width: 576px) {
    body {
        font-size: 0.95rem;
    }

    .hero-section {
        padding: 2rem 0;
        margin: 1rem 0;
    }

    .hero-section h1 {
        font-size: 1.75rem;
        margin-bottom: 0.75rem;
    }

    .form-section,
    .users-section {
        padding: 0.75rem;
        margin: 1rem 0;
    }

    .form-group {
        margin-bottom: 1rem;
    }

    .user-card h5 {
        font-size: 1.1rem;
    }

    .empty-state {
        padding: 1rem;
    }

    .empty-state i {
        font-size: 2.5rem;
    }

    .container {
        padding: 0 0.75rem;
    }

    #alertContainer {
        margin-bottom: 1rem;
    }

    .alert-custom {
        font-size: 0.9rem;
        padding: 0.75rem;
    }
}

/* =====================================================
   ANIMACIONES Y TRANSICIONES
   ===================================================== */
@media (prefers-reduced-motion: no-preference) {
    * {
        scroll-behavior: smooth;
    }

    .user-card {
        animation: fadeIn 0.3s ease;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =====================================================
   ACCESIBILIDAD
   ===================================================== */
:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* =====================================================
   PRINT STYLES
   ===================================================== */
@media print {
    body {
        background: #fff;
    }

    .navbar {
        display: none;
    }

    .form-section {
        display: none;
    }

    .user-card {
        box-shadow: none;
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}