/* Backpropagation demo - using unified system */
@import url('/css/unified-demos.css');
@import url('https://fonts.googleapis.com/css2?family=Fira+Sans:wght@300;400;600;700&family=Inconsolata:wght@400;600&display=swap');

/* Backpropagation specific variables extending the unified system */
.backpropagation-demo {
    /* Core variables fallback */
    --primary-color: var(--INTERNAL-PRIMARY-color, #0d6efd);
    --primary-hover: var(--INTERNAL-SECONDARY-color, #0b5ed7);
    --text-color: var(--INTERNAL-MAIN-TEXT-color, #212529);
    --text-muted: var(--INTERNAL-MAIN-TEXT-color, #6c757d);
    /* Fallback to main text if muted not avail, or specific color */
    --panel-bg: var(--INTERNAL-BOX-BG-color, #ffffff);
    --border-color: var(--INTERNAL-BORDER-color, #dee2e6);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Backpropagation specific variables */
    --bp-positive-weight: #198754;
    --bp-negative-weight: #dc3545;
    --bp-neuron-activation: #ffc107;
    --bp-error-delta: #fd7e14;
    --bp-font-mono: 'Inconsolata', 'SF Mono', 'Menlo', 'Monaco', monospace;

    font-family: 'Fira Sans', var(--demo-font-family);
    /* Use theme background or fallback to light gradient if not defined */
    /* background: var(--INTERNAL-MAIN-BG-color, linear-gradient(135deg, #eef2f3, #f8f9fa)); */
    color: var(--text-color);
    /* margin: 0; */
    /* padding: 30px 20px; */
    font-size: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    /* min-height: 100vh; */
    width: 100%;
}

.backpropagation-demo h1,
.backpropagation-demo h2,
.backpropagation-demo h3 {
    font-weight: 600;
    text-align: center;
    color: var(--text-color);
}

.backpropagation-demo h1 {
    margin-bottom: 30px;
    font-size: 2.8rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.05);
}

.backpropagation-demo .container {
    display: flex;
    gap: 30px;
    width: 100%;
    max-width: 1800px;
    align-items: flex-start;
    flex-wrap: wrap;
    /* Added for responsiveness */
}

/* --- PANELES INTRODUCTORIOS MEJORADOS --- */
.backpropagation-demo .intro-panel {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 25px 35px;
    width: 100%;
    max-width: 1800px;
    margin-bottom: 30px;
    box-sizing: border-box;
}

.backpropagation-demo .intro-panel h2 {
    text-align: left;
    margin-top: 0;
    color: var(--primary-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 20px;
}

.backpropagation-demo .intro-panel p,
.backpropagation-demo .intro-panel li {
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-color);
}

.backpropagation-demo .intro-panel ul {
    padding-left: 25px;
    list-style-type: '✓ ';
}

.backpropagation-demo .intro-panel code {
    background-color: var(--INTERNAL-CODE-BG-color, #e9ecef);
    padding: 3px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--bp-negative-weight);
    font-weight: 600;
}

/* --- PANELES CON ESTILO DE TARJETA --- */
.backpropagation-demo .panel {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 25px;
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    border-top: 4px solid var(--primary-color);
    width: 100%;
    /* Ensure full width in column */
    box-sizing: border-box;
}

.backpropagation-demo .panel:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.backpropagation-demo .left-column {
    flex: 3;
    display: flex;
    flex-direction: column;
    gap: 30px;
    min-width: 300px;
}

.backpropagation-demo .right-column {
    flex: 2;
    display: flex;
    flex-direction: column;
    gap: 30px;
    /* position: sticky; */
    /* Can cause issues in some layouts */
    /* top: 30px; */
    min-width: 300px;
}

.backpropagation-demo .panel h2 {
    margin-top: 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 20px;
    font-size: 1.5rem;
    color: var(--text-color);
}

.backpropagation-demo .panel-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-top: -15px;
    margin-bottom: 20px;
    font-style: italic;
    opacity: 0.8;
}

/* --- VISUALIZACIÓN DE LA RED MEJORADA --- */
.backpropagation-demo #network-visualization {
    width: 100%;
    min-height: 500px;
    height: auto;
}

.backpropagation-demo .neuron {
    stroke: var(--border-color);
    stroke-width: 2.5px;
    fill: var(--primary-color);
    transition: fill 0.3s ease, fill-opacity 0.3s ease;
    filter: drop-shadow(3px 3px 2px rgba(0, 0, 0, 0.3));
}

.backpropagation-demo .neuron-label {
    font-size: 14px;
    fill: #ffffff;
    font-weight: bold;
    text-anchor: middle;
    pointer-events: none;
    user-select: none;
}

.backpropagation-demo .neuron-value {
    font-size: 14px;
    fill: var(--text-color);
    text-anchor: middle;
    pointer-events: none;
    user-select: none;
    font-weight: 600;
}

.backpropagation-demo .delta-value {
    font-size: 13px;
    fill: var(--bp-error-delta);
    font-weight: bold;
    text-anchor: middle;
    pointer-events: none;
    user-select: none;
}

.backpropagation-demo .connection {
    stroke: #6c757d;
    stroke-width: 2px;
    opacity: 0.6;
    transition: stroke 0.3s ease, stroke-width 0.2s ease, opacity 0.3s ease;
}

[data-theme='dark'] .backpropagation-demo .connection {
    stroke: #adb5bd;
    opacity: 0.8;
}

[data-theme='dark'] .backpropagation-demo .data-point {
    stroke: #ffffff;
    stroke-width: 1.5px;
}

[data-theme='dark'] .backpropagation-demo .axis-line {
    stroke: #adb5bd;
}

[data-theme='dark'] .backpropagation-demo .axis-label {
    fill: #ced4da;
}

.backpropagation-demo .connection:hover {
    stroke-width: 6px;
    opacity: 1;
}

.backpropagation-demo .weight-value {
    font-size: 12px;
    fill: var(--text-muted);
    text-anchor: middle;
    pointer-events: none;
    user-select: none;
}

.backpropagation-demo .layer-label {
    font-size: 18px;
    font-weight: bold;
    text-anchor: middle;
    fill: var(--text-muted);
}

/* --- GRÁFICO 2D --- */
.backpropagation-demo #data-plot-container {
    position: relative;
    width: 100%;
    padding-top: 100%;
    /* Aspect ratio 1:1 */
}

.backpropagation-demo #data-plot {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--panel-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    cursor: crosshair;
}

/* --- NUEVOS ESTILOS PARA EL PANEL DE INFO --- */
.backpropagation-demo #data-plot-info {
    margin-top: 20px;
    padding: 15px;
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    min-height: 85px;
    /* Evita que el layout salte */
    font-family: var(--font-mono);
    color: var(--text-muted);
    line-height: 1.7;
    font-size: 15px;
    transition: background-color 0.2s;
}

.backpropagation-demo #data-plot-info b {
    color: var(--text-color);
}

.backpropagation-demo #data-plot-info code {
    color: var(--primary-color);
    font-weight: 600;
}

.backpropagation-demo .data-point {
    stroke: var(--border-color);
    stroke-width: 1px;
    fill: var(--text-muted);
    transition: fill 0.4s ease, fill-opacity 0.4s ease;
}

.backpropagation-demo .prediction-point {
    stroke: var(--text-color);
    stroke-width: 2px;
}

.backpropagation-demo .axis-line {
    stroke: var(--border-color);
    stroke-width: 2px;
}

.backpropagation-demo .axis-label {
    font-size: 14px;
    fill: var(--text-muted);
}

/* --- Tooltip & Popup --- */
.backpropagation-demo .tooltip {
    position: absolute;
    background-color: var(--INTERNAL-BOX-BG-color, rgba(0, 0, 0, 0.85));
    color: var(--INTERNAL-MAIN-TEXT-color, #fff);
    padding: 12px 15px;
    border-radius: 8px;
    font-size: 14px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s, top 0.1s, left 0.1s;
    max-width: 350px;
    word-wrap: break-word;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    z-index: 9999;
    border: 1px solid var(--border-color);
}

.backpropagation-demo .tooltip code {
    background-color: var(--INTERNAL-CODE-BG-color, #444);
    padding: 2px 4px;
    border-radius: 3px;
    font-family: var(--font-mono);
    color: var(--text-color);
}

.backpropagation-demo #prediction-popup {
    border: 2px solid var(--primary-color);
}

.backpropagation-demo #prediction-popup h4 {
    margin: 0 0 10px 0;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
}

.backpropagation-demo #prediction-popup .popup-detail {
    margin-bottom: 5px;
}


/* --- CONTROLES Y ESTADO REDISEÑADOS --- */
.backpropagation-demo #controls-panel {
    text-align: center;
}

.backpropagation-demo .buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.backpropagation-demo button {
    background-color: var(--primary-color);
    color: #ffffff;
    /* Always white for contrast on primary color */
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.backpropagation-demo button:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.backpropagation-demo button#reset-btn {
    background-color: var(--text-muted);
    color: #ffffff;
}

.backpropagation-demo button#reset-btn:hover {
    background-color: #5a6268;
}

.backpropagation-demo button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.backpropagation-demo .turbo-mode {
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-muted);
}

.backpropagation-demo .status {
    display: flex;
    justify-content: space-around;
    font-size: 18px;
    text-align: center;
    flex-wrap: wrap;
    gap: 10px;
}

.backpropagation-demo .status-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.backpropagation-demo .status-item span:first-child {
    font-weight: 400;
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 4px;
}

.backpropagation-demo .status-item span:last-child {
    font-weight: 700;
    font-size: 24px;
    color: var(--text-color);
}

/* --- DATASET Y TABLA MEJORADOS --- */
.backpropagation-demo #dataset-panel {
    max-height: 300px;
    overflow-y: auto;
}

.backpropagation-demo #dataset-table {
    width: 100%;
    border-collapse: collapse;
}

.backpropagation-demo #dataset-table th,
.backpropagation-demo #dataset-table td {
    border: 1px solid var(--border-color);
    padding: 10px;
    text-align: center;
    font-size: 14px;
}

.backpropagation-demo #dataset-table th {
    background-color: var(--panel-bg);
    position: sticky;
    top: -1px;
    font-weight: 600;
    color: var(--text-color);
    border-bottom: 2px solid var(--border-color);
}

.backpropagation-demo #dataset-table tbody tr {
    transition: background-color 0.15s ease-in-out;
    color: var(--text-color);
}

.backpropagation-demo #dataset-table tbody tr:hover {
    background-color: var(--INTERNAL-BOX-BG-color, #f1f3f5);
    filter: brightness(0.95);
}

.backpropagation-demo #dataset-table tr.active-sample {
    background-color: color-mix(in srgb, var(--primary-color) 20%, var(--panel-bg));
    font-weight: bold;
}

/* --- PANEL DE EXPLICACIONES --- */
.backpropagation-demo #explanation-panel {
    min-height: 400px;
}

.backpropagation-demo .explanation-content {
    font-family: var(--font-mono);
    white-space: pre-wrap;
    background-color: var(--INTERNAL-CODE-BG-color, #f1f3f5);
    padding: 20px;
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.7;
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

.backpropagation-demo .formula {
    color: var(--primary-color);
    font-weight: 600;
}

.backpropagation-demo .value {
    color: var(--bp-negative-weight);
    font-weight: 600;
}

.backpropagation-demo .highlight {
    background-color: color-mix(in srgb, var(--bp-neuron-activation) 20%, var(--panel-bg));
    padding: 2px 4px;
    border-radius: 4px;
    border: 1px solid color-mix(in srgb, var(--bp-neuron-activation) 40%, var(--panel-bg));
}

.backpropagation-demo .math-detail {
    background-color: var(--panel-bg);
    padding: 10px 15px;
    margin-top: 10px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    font-size: 13px;
}

/* --- NUEVOS ESTILOS --- */
.backpropagation-demo .control-group {
    margin-bottom: 15px;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.backpropagation-demo .control-group label {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-color);
}

.backpropagation-demo .loss-graph-container {
    margin-top: 20px;
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

.backpropagation-demo .loss-graph-container h3 {
    font-size: 16px;
    margin-bottom: 10px;
    text-align: left;
    color: var(--text-color);
}

.backpropagation-demo .plot-legend {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 10px;
    margin-bottom: 10px;
}

.backpropagation-demo .legend-item {
    display: flex;
    align-items: center;
    font-size: 14px;
    color: var(--text-color);
}

.backpropagation-demo .color-box {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 5px;
    display: inline-block;
}