:root {
    --primary-color: #2b6cb0; /* Azul institucional */
    --primary-hover: #1a4f8b;
    --secondary-color: #4a5568;
    --accent-color: #e2e8f0;
    --success-color: #38a169;
    --danger-color: #e53e3e;
    --warning-color: #dd6b20;
    --bg-color: #f7fafc;
    --card-bg: #ffffff;
    --text-main: #2d3748;
    --text-muted: #718096;
    --border-color: #cbd5e0;
    --overlay-color: rgba(255, 255, 255, 0.85);
    
    --border-radius: 8px;
    --transition-speed: 0.3s;
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

/* Header & Burger Menu */
.app-header {
    background: white;
    padding: 1rem 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-burger {
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--primary-color);
    padding: 5px;
    border-radius: 5px;
    transition: background 0.2s;
}

.btn-burger:hover {
    background: rgba(0,0,0,0.05);
}

/* Side Menu */
.side-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background: white;
    box-shadow: 2px 0 15px rgba(0,0,0,0.2);
    z-index: 2000;
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

.side-menu.hidden {
    transform: translateX(-100%);
    display: flex; /* Mantener flex pero movido */
}

.menu-header {
    padding: 1.5rem;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--primary-color);
    color: white;
}

.menu-links {
    list-style: none;
    padding: 1rem 0;
}

.menu-item {
    width: 100%;
    padding: 1rem 1.5rem;
    text-align: left;
    background: none;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    display: flex;
    align-items: center;
    gap: 10px;
}

.menu-item:hover {
    background: #f5f5f5;
    color: var(--primary-color);
}

.menu-item.active {
    background: rgba(43, 108, 176, 0.1);
    color: var(--primary-color);
    font-weight: 600;
    border-right: 4px solid var(--primary-color);
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    background-image: url('https://images.unsplash.com/photo-1507842217343-583bb7270b66?q=80&w=1920&auto=format&fit=crop');
    background-size: cover;
    background-attachment: fixed;
    background-position: center;
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--overlay-color);
    z-index: -1;
}

/* Layout Principal */
.app-header {
    background-color: var(--card-bg);
    box-shadow: var(--shadow-md);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-content h1 {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.8rem;
    letter-spacing: -0.5px;
}

.app-main {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 2rem auto;
    padding: 0 2rem;
}

/* Controles (Buscar y Agregar) */
.controls-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.search-bar {
    flex: 1;
    max-width: 500px;
}

#search-input {
    width: 100%;
    padding: 0.8rem 1.2rem;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 1rem;
    outline: none;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

#search-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(43, 108, 176, 0.2);
}

#admin-controls:not(.hidden) {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.btn-delete-bulk {
    background-color: #742a2a !important;
    color: white !important;
}

.btn-delete-bulk:hover {
    background-color: #9b2c2c !important;
}

/* Botones Generales */
.btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-speed);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: inherit;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--accent-color);
    color: var(--text-main);
}

.btn-secondary:hover {
    background-color: #cbd5e0;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: #2f855a;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #c53030;
}

.w-100 {
    width: 100%;
}

/* Menú Agregar */
.add-menu-dropdown {
    position: absolute;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    padding: 0.5rem 0;
    z-index: 100;
    margin-top: 5px;
}

.btn-menu-option {
    display: block;
    width: 100%;
    padding: 0.7rem 1.5rem;
    border: none;
    background: none;
    text-align: left;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.95rem;
    transition: background-color 0.2s;
}

.btn-menu-option:hover {
    background-color: var(--accent-color);
    color: var(--primary-color);
}

/* Categorías en Mosaico */
.category-container {
    margin-bottom: 3rem;
    animation: fadeIn 0.5s ease-in-out;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.category-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2.5rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-speed);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.2rem;
    position: relative;
    overflow: hidden;
}

.category-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.category-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.category-card:hover::after {
    transform: scaleX(1);
}

.category-icon {
    font-size: 3.5rem;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

.category-name {
    font-weight: 700;
    color: var(--text-main);
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

/* Volver a categorías */
.btn-back-categories {
    margin-bottom: 2rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    color: var(--primary-color);
    cursor: pointer;
    background-color: transparent;
    border: none;
    font-size: 1rem;
    padding: 0.5rem 0;
    transition: transform 0.2s;
}

.btn-back-categories:hover {
    transform: translateX(-5px);
    text-decoration: underline;
}

/* Checkboxes para borrado masivo */
.card-select-container {
    position: absolute;
    top: 12px;
    left: 12px;
    z-index: 5;
    background: white;
    border-radius: 4px;
    padding: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

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

/* Grilla de Tarjetas */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card {
    position: relative;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    border-top: 4px solid var(--primary-color);
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.card.material {
    border-top-color: var(--warning-color);
}

.card-header {
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.2rem;
}

.card-subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.card-body {
    flex: 1;
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.card-body p {
    margin-bottom: 0.3rem;
}

.stock-info {
    font-weight: 600;
    margin-top: 0.8rem;
    padding: 0.5rem;
    background-color: var(--accent-color);
    border-radius: 4px;
    text-align: center;
}

.stock-out {
    background-color: #fed7d7;
    color: #c53030;
}

.card-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    border-top: 1px solid var(--accent-color);
    padding-top: 1rem;
}

.card-actions .btn {
    flex: 1;
    font-size: 0.85rem;
    padding: 0.4rem 0.5rem;
}

.btn-icon {
    flex: none !important;
    width: 32px;
    padding: 0 !important;
}

/* Footer Institucional */
.app-footer {
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    margin-top: auto;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.institution-logo {
    width: 100px;
    height: auto;
    margin-bottom: 0.5rem;
    filter: drop-shadow(var(--shadow-md));
}

.app-footer h2 {
    color: var(--text-main);
    font-weight: 600;
    font-size: 1.1rem;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed);
}

.modal:not(.hidden) {
    opacity: 1;
    pointer-events: auto;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    width: 90%;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
    position: relative;
    transform: translateY(-20px);
    transition: transform var(--transition-speed);
    max-height: 90vh;
    overflow-y: auto;
}

.modal-content.modal-lg {
    max-width: 600px;
}

.modal:not(.hidden) .modal-content {
    transform: translateY(0);
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-muted);
    cursor: pointer;
}

.close-btn:hover {
    color: var(--danger-color);
}

.modal h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

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

.form-row, .form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 500;
    color: var(--secondary-color);
    font-size: 0.9rem;
}

input[type="text"],
input[type="password"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--accent-color);
}

.error-msg {
    color: var(--danger-color);
    font-size: 0.85rem;
    margin-bottom: 1rem;
    text-align: center;
}

/* Notificaciones Toast */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background-color: var(--text-main);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    font-size: 0.95rem;
    opacity: 0;
    transform: translateX(20px);
    transition: all 0.3s ease-in-out;
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
}

.toast.success { background-color: var(--success-color); }
.toast.error { background-color: var(--danger-color); }
.toast.info { background-color: var(--primary-color); }

/* Helpers */
.hidden {
    display: none !important;
}

.highlight-text {
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding: 0.5rem;
    background-color: var(--accent-color);
    border-radius: 4px;
}

/* News Section */
.news-container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.news-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid #edf2f7;
    position: relative;
    display: flex;
    flex-direction: column;
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

.news-img {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.news-no-img {
    height: 220px;
    background: linear-gradient(135deg, var(--primary-color), #63b3ed);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.news-body {
    padding: 1.5rem;
    flex-grow: 1;
}

.news-date {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    display: block;
}

.news-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-main);
}

.news-content {
    font-size: 0.95rem;
    line-height: 1.6;
    color: #4a5568;
    white-space: pre-wrap;
}

.btn-delete-news {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(229, 62, 62, 0.9);
    color: white;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    z-index: 10;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.img-preview img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
}

/* Fix for Category Cards rendering */
.category-card {
    background: white;
    padding: 2.5rem 1.5rem;
    border-radius: 15px;
    text-align: center;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.category-card:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.category-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    display: block;
}

.category-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
}