:root {
    /* TEMA OSCURO (Por defecto) - Estética Industrial/Tech */
    --bg: #0a0b10;
    --card: #161821;
    --accent: #00d2ff; /* Neón Cyan */
    --text: #e0e0e0;
    --danger: #ff4b2b;
    --success: #00ff88;
    --warning: #ffcc00;
    --input-bg: #1f222d;
    --border-color: #2a2d3a;
    --glow: rgba(0, 210, 255, 0.3);
}

[data-theme="light"] {
    /* TEMA CLARO - Limpio y profesional */
    --bg: #f0f2f5;
    --card: #ffffff;
    --accent: #0056b3;
    --text: #1a1d27;
    --danger: #dc3545;
    --success: #198754;
    --warning: #ffc107;
    --input-bg: #f8f9fa;
    --border-color: #dee2e6;
    --glow: rgba(0, 86, 179, 0.3);
}

/* Transiciones globales para el cambio de tema */
body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* --- HEADER RESPONSIVO --- */
header {
    width: 100%;
    padding: 20px;
    background: var(--card);
    border-bottom: 2px solid var(--accent);
    text-align: center;
    box-sizing: border-box;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    transition: background-color 0.4s ease, border-color 0.4s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

header h1 {
    margin: 0;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Botones de Cabecera */
.btn-logout {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--danger);
    font-size: 13px;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-logout:hover {
    background: var(--danger);
    color: white;
    box-shadow: 0 0 10px rgba(255, 75, 43, 0.4);
}

.btn-theme {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border-color);
    font-size: 16px;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-theme:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* --- CONTENEDOR PRINCIPAL --- */
.container {
    width: 95%;
    max-width: 1200px;
    margin: 30px auto;
    padding: 0;
    box-sizing: border-box;
    animation: fadeIn 0.5s ease;
}

/* --- BOTONES Y ACCIONES --- */
.header-acciones {
    display: flex;
    gap: 12px;
    margin-bottom: 25px;
    flex-wrap: wrap;
    justify-content: center;
}

button {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 12px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    white-space: nowrap;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

[data-theme="light"] button { color: #fff; }
button:not(.btn-logout):not(.btn-theme):not(.btn-limpiar-busqueda) { color: #000; }

button:hover { 
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--glow);
}

button:active {
    transform: translateY(0);
}

/* Botones específicos */
.btn-eliminar-todo { background: var(--danger); color: white !important; }
.btn-excel-exp { background: var(--success); color: black !important; }
.btn-excel-imp { background: var(--warning); color: black !important; }

/* --- BARRA DE BÚSQUEDA --- */
.buscador-wrapper {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.buscador-box {
    position: relative;
    flex: 1;
    min-width: 260px;
    display: flex;
    align-items: center;
}

.buscador-box input {
    width: 100%;
    padding: 13px 44px 13px 44px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text);
    font-size: 15px;
    box-sizing: border-box;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.buscador-box input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--glow);
}

.buscador-icon {
    position: absolute;
    left: 15px;
    color: var(--accent);
    font-size: 15px;
    pointer-events: none;
    opacity: 0.8;
}

.btn-limpiar-busqueda {
    position: absolute;
    right: 10px;
    background: transparent !important;
    border: none !important;
    padding: 4px 6px !important;
    color: var(--text) !important;
    opacity: 0.5;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    box-shadow: none !important;
    transform: none !important;
    transition: opacity 0.2s ease !important;
}

.btn-limpiar-busqueda:hover {
    opacity: 1 !important;
    transform: none !important;
    box-shadow: none !important;
    background: var(--border-color) !important;
}

.contador-resultados {
    font-size: 13px;
    color: var(--accent);
    opacity: 0.75;
    white-space: nowrap;
    font-weight: 500;
    letter-spacing: 0.3px;
}

/* Mensaje sin resultados */
.sin-resultados {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 60px 20px;
    color: var(--text);
    opacity: 0.4;
    font-size: 15px;
    animation: fadeIn 0.3s ease;
}

.sin-resultados i {
    font-size: 48px;
    color: var(--accent);
    opacity: 0.5;
}

.sin-resultados p {
    margin: 0;
}

/* --- TABLA RESPONSIVA --- */
.table-container {
    width: 100%;
    overflow-x: auto;
    background: var(--card);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: background-color 0.4s ease;
}

.product-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 800px;
}

.product-table th, .product-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 14.5px;
    transition: border-color 0.4s ease;
}

.product-table th { 
    background: var(--input-bg); 
    color: var(--accent);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 13px;
}

.product-table tr:hover td {
    background: rgba(0, 210, 255, 0.03);
}

.img-mini {
    width: 50px;
    height: 50px;
    object-fit: cover;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}

.img-mini:hover {
    transform: scale(1.1);
}

/* --- MODAL RESPONSIVO --- */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(5px);
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 15px;
    box-sizing: border-box;
    opacity: 0;
    animation: fadeInModal 0.3s forwards;
}

.modal-content {
    background: var(--card);
    padding: 30px;
    border-radius: 12px;
    width: 100%;
    max-width: 650px;
    position: relative;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    max-height: 90vh;
    overflow-y: auto;
    transition: background-color 0.4s ease;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 24px;
    color: var(--text);
    cursor: pointer;
    transition: color 0.3s ease;
}

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

/* Formulario en Grid */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 20px;
}

.form-full { grid-column: 1 / -1; }

input, textarea, select {
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text);
    padding: 14px;
    border-radius: 8px;
    font-family: inherit;
    width: 100%;
    box-sizing: border-box;
    font-size: 15px;
    transition: all 0.3s ease;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--glow);
}

.preview-box {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.img-preview {
    width: 100%;
    max-height: 200px;
    object-fit: contain;
    border-radius: 8px;
    border: 1px dashed var(--border-color);
    background: var(--input-bg);
    padding: 5px;
}

/* --- LOGIN BOX --- */
.login-box {
    background: var(--card);
    padding: 40px 30px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    text-align: center;
    width: 100%;
    max-width: 400px;
    box-sizing: border-box;
}

/* --- ANIMACIONES --- */
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInModal { from { opacity: 0; } to { opacity: 1; } }

/* --- MEDIA QUERIES (MÓVIL) --- */
@media (max-width: 768px) {
    .form-grid { grid-template-columns: 1fr; }
    
    header { padding: 15px; }
    header h1 { font-size: 1.3rem; }
    
    .btn-logout, .btn-theme {
        position: static;
        margin: 5px;
    }

    .header-acciones {
        flex-direction: column;
        width: 100%;
    }

    .header-acciones button {
        width: 100%;
        justify-content: center;
        padding: 14px;
        font-size: 15px;
    }

    .buscador-wrapper {
        flex-direction: column;
        align-items: flex-start;
    }

    .buscador-box {
        width: 100%;
    }

    .modal-content { padding: 20px; }
}

@media (min-width: 769px) {
    .btn-logout {
        position: absolute;
        right: 20px;
        top: 25px;
    }
    
    .btn-theme {
        position: absolute;
        right: 140px;
        top: 25px;
    }

    header {
        flex-direction: row;
        justify-content: center;
        padding: 25px;
    }
}