:root {
/* Modo Oscuro (Predeterminado) */
    --bg-primary: #1A1A2E; 
    --bg-secondary: #1F2840; 
    /* secundarios */
    --text-primary: #E0E0E0; 
    --text-secondary: #B0B0B0; 
    --accent-color: #8E44AD; 
    --warning-color: #E74C3C; 
    --success-color: #2ECC71; 
    --border-color: rgba(255, 255, 255, 0.1); 
    /* sombras */
    --shadow-color: rgba(0, 0, 0, 0.4); 
    /* items */
    --glass-bg-alpha: 0.15; 
    --glass-border-alpha: 0.2; 
    --table-header-bg: #2C3E50; 
    --table-row-even-bg: #1F2840; 
    --table-row-odd-bg: #1A1A2E; 
}

/*//// Variables para Modo Claro ////*/
body.light-mode {
    --bg-primary: #F7F8FC; 
    --bg-secondary: #FFFFFF;
    /* secundarios-light */
    --text-primary: #2C3E50; 
    --text-secondary: #7F8C8D;
    --accent-color: #9B59B6; 
    --warning-color: #E74C3C; 
    --success-color: #2ECC71; 
    --border-color: rgba(0, 0, 0, 0.1);
    /* sombras-light */
    --shadow-color: rgba(0, 0, 0, 0.1);
    /* items-light */
    --glass-bg-alpha: 0.7;
    --glass-border-alpha: 0.15;
    --table-header-bg: #ECF0F1;
    --table-row-even-bg: #F9F9F9;
    --table-row-odd-bg: #FFFFFF;
}
/* Estilos generales */
body {
    font-family: 'SF Pro Display', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
    background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary)); 
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    color: var(--text-primary);
    transition: background-color 0.8s ease, color 0.8s ease;
}

.content-card { 
    background-color: rgba(var(--bg-secondary), var(--glass-bg-alpha)); 
    backdrop-filter: blur(25px) saturate(180%);
    -webkit-backdrop-filter: blur(25px) saturate(180%); 
    border: 1px solid rgba(var(--text-primary), var(--glass-border-alpha));
    border-radius: 30px; 
    box-shadow:
        0 1px 2px var(--shadow-color),
        0 2px 4px var(--shadow-color),
        0 4px 8px var(--shadow-color),
        0 8px 16px var(--shadow-color),
        0 16px 32px var(--shadow-color),
        0 32px 64px var(--shadow-color);
    padding: 2rem;
    width: 90%; 
    height: auto;
    text-align: center;
    position: relative;
    z-index: 1;
    transition: all 0.5s cubic-bezier(0.22, 0.61, 0.36, 1);
    transform: translateY(0);
}

.content-card:hover { 
    transform: translateY(-8px);
    box-shadow:
        0 5px 15px var(--shadow-color),
        0 10px 30px var(--shadow-color),
        0 20px 60px var(--shadow-color),
        0 40px 120px var(--shadow-color);
}

h1 {
    font-size: 2.8rem; 
    color: var(--text-primary);
    margin-bottom: 25px;
    position: relative;
    letter-spacing: -0.02rem; 
}

.h1-secret{
    position: relative;
    display: none;
}
.h1-secret::after {
    content: ' '; /* Texto completo para el hover */
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.5em; /* Más pequeño y sutil */
    color: var(--accent-color);
    opacity: 0;
    transition: opacity 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    white-space: nowrap;
}
.h1-secret:hover::after {
    opacity: 1;
    display: inline-block
}

p {
    font-size: 1.2rem; /* Un poco más grande */
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6; /* Mejor legibilidad */
}

.button-group {
    display: flex;
    justify-content: center;
    gap: 25px; 
    margin-bottom: 50px; 
}

.action-button {
    background-color: var(--accent-color);
    color: var(--text-primary); 
    padding: 18px 40px; 
    border: none;
    border-radius: 9999px; 
    font-size: 1.2rem; 
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275); 
    box-shadow: 0 5px 15px var(--shadow-color); 
}

.action-button:hover {
    transform: translateY(-5px); 
    box-shadow: 0 8px 20px var(--shadow-color);
}

.action-button:active { 
    transform: scale(0.96) translateY(0);
    box-shadow: 0 2px 5px var(--shadow-color);
}

/*///// Toggle de modo oscuro/claro ///// */
.theme-toggle {
    position: absolute;
    top: 30px; 
    right: 30px;
    width: 80px; 
    height: 40px; 
    background-color: var(--bg-secondary);
    border-radius: 20px; 
    padding: 5px; 
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between; 
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: background-color 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    border: 1px solid var(--border-color);
    overflow: hidden; 
}

.theme-toggle .slider { 
    position: absolute;
    left: 5px; 
    width: 30px; /* Tamaño del pulgar */
    height: 30px;
    background-color: var(--accent-color); 
    border-radius: 50%; 
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94); 
    box-shadow: 0 2px 5px var(--shadow-color);
}
.theme-toggle.light .slider {
    transform: translateX(43px); /* Desplaza el pulgar a la derecha */
}
.theme-toggle .icon {
    font-size: 1.6rem;
    z-index: 2; 
    transition: color 0.3s ease;
    width: 30px; 
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary); 
}
/* Cambios Segun el Color de Tema */
.theme-toggle.dark .moon-icon { color: var(--text-primary); }
.theme-toggle.dark .sun-icon { color: var(--text-secondary); }
.theme-toggle.light .moon-icon { color: var(--text-secondary); }
.theme-toggle.light .sun-icon { color: var(--accent-color); } /

/* Estilos para la tabla (inicialmente oculta) */
#product-table-container {
    background-color: rgba(var(--bg-secondary), var(--glass-bg-alpha)); 
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-radius: 20px; 
    padding: 30px;
    box-shadow: 0 8px 20px var(--shadow-color);
    max-height: 450px; 
    overflow-y: auto;
    opacity: 0; 
    transform: scale(0.9) translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                background-color 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
    border: 1px solid rgba(var(--text-primary), var(--glass-border-alpha));
}

#product-table-container.visible {
    opacity: 1;
    transform: scale(1) translateY(0);
}
#search-items {
    width: calc(100% - 20px);
    padding: 12px 20px; 
    margin-bottom: 25px;
    border: 1px solid var(--border-color);
    border-radius: 9999px; 
    font-size: 1.1em;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: inset 0 1px 3px var(--shadow-color); 
}
#search-items:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(var(--accent-color), 0.3); 
}
#search-items::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 10px; 
}

th, td {
    padding: 18px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: color 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
    font-weight: 500; 
}

th {
    background-color: var(--table-header-bg);
    font-weight: 600; 
    color: var(--text-primary);
    position: sticky;
    top: 0;
    z-index: 2;
    border-radius: 8px 8px 0 0; 
}
th:first-child { border-top-left-radius: 8px; }
th:last-child { border-top-right-radius: 8px; }

td {
    background-color: var(--table-row-odd-bg); 
    border-radius: 8px; 
}

tr:nth-child(even) td {
    background-color: var(--table-row-even-bg);
}

tr:hover td { 
    background-color: var(--accent-color)!important; 
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(var(--shadow-color), 0.2);
    transition: all 0.2s ease-out;
}


/* Clase para stock crítico - Píldora pulsante */
.low-stock {
    background-color: var(--warning-color) !important; 
    color: var(--text-primary) !important; 
    font-weight: bold;
    position: relative;
}
@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.9; }
    100% { transform: scale(1); opacity: 1; }
}
.low-stock .alert-pill {
    display: inline-flex; 
    align-items: center;
    gap: 5px;
    padding: 4px 8px;
    background-color: rgba(var(--text-primary), 0.2); 
    border-radius: 12px;
    font-size: 0.9em;
    margin-left: 8px;
    animation: pulse 1.5s infinite ease-in-out;
}
.low-stock .stock-pill::before {
    content: '🚨'; 
    font-size: 0.8em;
    margin-right: 3px;
}

/* Modal de Eliminar */
.modal-card {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--shadow-color); 
    backdrop-filter: blur(18px); 
    -webkit-backdrop-filter: blur(18px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease-out, visibility 0.4s ease-out, background-color 0.4s ease;
    z-index: 1000;
}
.modal-card.visible {
    opacity: 1;
    visibility: visible;
}
.modal-content {
    background-color: var(--bg-secondary), var(--glass-bg-alpha);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 35px; 
    border-radius: 20px; 
    box-shadow: 0 15px 40px var(--shadow-color);
    width: 90%;
    max-width: 500px;
    text-align: center;
    transform: scale(0.8) translateY(-30px); 
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), 
        opacity 0.4s ease-out,
        background-color 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    border: 1px solid rgba(var(--text-primary), var(--glass-border-alpha));
}
.modal-card.visible .modal-content {
    transform: scale(1) translateY(0);
    opacity: 1;
}
.modal-content h2 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 30px;
    letter-spacing: -0.01rem;
}
.modal-content label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: var(--text-secondary);
    text-align: left;
    font-size: 0.95rem;
}
.modal-content input, .modal-content select {
    width: calc(100% - 24px); 
    padding: 12px;
    margin-bottom: 25px;
    border: 1px solid var(--border-color);
    border-radius: 12px; 
    font-size: 1.1rem;
    box-sizing: border-box;
    background-color: var(--bg-primary); 
    color: var(--text-primary);
    transition: all 0.3s ease;
    box-shadow: inset 0 1px 3px var(--shadow-color);
}
.modal-content input:focus, .modal-content select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(var(--accent-color), 0.3); 
}
.modal-content input::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.modal-content .error-message {
    color: var(--warning-color);
    font-size: 0.9rem;
    margin-top: -15px;
    margin-bottom: 15px;
    text-align: left;
    opacity: 0;
    max-height: 0; 
    overflow: hidden;
    transition: opacity 0.3s ease, max-height 0.3s ease;
}
.modal-content .error-message.visible {
    opacity: 1;
    max-height: 50px; 
}

.modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    margin-top: 30px;
}
.modal-button {
    padding: 12px 25px; 
    border: none;
    border-radius: 10px; 
    cursor: pointer;
    font-size: 1em;
    font-weight: 500;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 2px 5px var(--shadow-color);
}
.modal-button.confirm {
    background-color: var(--success-color);
    color: var(--text-primary);
}
.modal-button.confirm:hover { 
    transform: translateY(-3px); 
    box-shadow: 0 5px 10px var(--shadow-color); }
.modal-button.confirm:active { 
    transform: scale(0.96); 
    box-shadow: 0 1px 3px var(--shadow-color); }

.modal-button.cancel {
    background-color: var(--text-secondary);
    color: var(--bg-primary); 
}
.modal-button.cancel:hover { 
    transform: translateY(-3px);
    box-shadow: 0 5px 10px var(--shadow-color); }
.modal-button.cancel:active { 
    transform: scale(0.96); 
    box-shadow: 0 1px 3px var(--shadow-color); }