/**
 * Fijate Tools - Calculadora de Tensión de Cordajes
 * Estilos responsivos, gráficos y diseño prémium Midnight Slate
 */

:root {
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Tema oscuro Midnight Slate */
    --bg-base: #0b0f17;
    --bg-surface: #111827;
    --bg-surface-elevated: #1f2937;
    --bg-surface-hover: #374151;
    --border-subtle: #1f2937;
    --border-strong: #374151;

    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;

    --brand-primary: #10b981;
    --brand-primary-hover: #059669;
    --brand-accent: #3b82f6;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 24px;
    --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
    --bg-base: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-elevated: #f1f5f9;
    --bg-surface-hover: #e2e8f0;
    --border-subtle: #e2e8f0;
    --border-strong: #cbd5e1;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
}

/* Base obligatoria */
body {
    margin: 0;
    padding: 0;
    font-family: var(--font-main);
    background-color: var(--bg-base);
    color: var(--text-primary);
    overflow-x: clip;
    width: 100%;
    max-width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Layout canónico */
.main-wrapper.tool-layout {
    max-width: 1200px;
    margin: 1.5rem auto 3rem;
    padding: 0 1rem;
    box-sizing: border-box;
    flex: 1 0 auto;
    width: 100%;
}

.tool-with-sidebar {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    width: 100%;
}

.tool-main-content {
    flex: 1 1 0%;
    min-width: 0;
    width: 100%;
}

/* Grid interactivo de dos columnas: Parámetros vs Resultados y Curva */
.tension-workspace-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem;
    margin-bottom: 2rem;
}

.params-panel, .results-panel {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 1.75rem;
    box-shadow: var(--shadow-card);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.panel-title {
    margin: 0;
    font-family: var(--font-heading);
    font-size: 1.35rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.unit-selector-group {
    display: inline-flex;
    background-color: var(--bg-surface-elevated);
    padding: 3px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
}

.btn-unit-toggle {
    background: none;
    border: none;
    padding: 0.4rem 0.85rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-unit-toggle.active {
    background-color: var(--brand-primary);
    color: #0b0f17;
}

/* Formulario de parámetros */
.form-row {
    margin-bottom: 1.25rem;
}

.form-label-box {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.4rem;
}

.form-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.val-badge {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--brand-primary);
    background-color: rgba(16, 185, 129, 0.1);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
}

.form-select, .form-range-input {
    width: 100%;
    box-sizing: border-box;
}

.form-select {
    padding: 0.75rem 1rem;
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 0.95rem;
    min-height: 42px;
}

.form-select:focus {
    outline: none;
    border-color: var(--brand-primary);
}

.form-range-input {
    accent-color: var(--brand-primary);
    cursor: pointer;
    margin-top: 0.25rem;
}

/* Tarjetas de resultados */
.main-kpi-tension-box {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(59, 130, 246, 0.08));
    border: 1px solid var(--brand-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    margin-bottom: 1.5rem;
    position: relative;
}

.kpi-label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--brand-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.4rem;
}

.kpi-number-huge {
    font-family: var(--font-mono);
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
    margin: 0.25rem 0;
}

.unit-tag {
    font-size: 1.5rem;
    color: var(--brand-primary);
    font-weight: 700;
}

.kpi-subtext {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.4rem;
}

/* Desglose de 4 nudos: Mains vs Crosses */
.tension-subkpi-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.subkpi-card {
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1rem;
    text-align: center;
}

.subkpi-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.subkpi-val {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

/* Tarjeta de salud articular / codo de tenista */
.health-card {
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1.5rem;
    font-size: 0.85rem;
    line-height: 1.5;
    border: 1px solid transparent;
}

.health-card-optimal {
    background-color: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.3);
    color: #34d399;
}

.health-card-warning {
    background-color: rgba(245, 158, 11, 0.12);
    border-color: rgba(245, 158, 11, 0.4);
    color: #fbbf24;
}

/* Visualizador interactivo de la curva en Canvas */
.loss-chart-box {
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.loss-chart-title {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 0.75rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.canvas-container {
    position: relative;
    width: 100%;
    height: 260px;
}

#tensionLossCanvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
}

/* Conversor rápido inferior */
.quick-converter-box {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-card);
}

.converter-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 1.25rem;
    margin-top: 1rem;
}

.conv-field {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.conv-field label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.conv-field input {
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    text-align: center;
}

.conv-divider {
    color: var(--brand-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Botón de exportación */
.btn-action-primary {
    background-color: var(--brand-primary);
    color: #0b0f17;
    font-weight: 700;
    border: none;
    border-radius: var(--radius-md);
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    min-height: 44px;
    transition: background-color 0.15s ease;
}

.btn-action-primary:hover {
    background-color: var(--brand-primary-hover);
}

/* Guía SEO */
.seo-guide-section {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin-top: 2rem;
    box-shadow: var(--shadow-card);
}

.seo-guide-section h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-top: 0;
    margin-bottom: 1rem;
}

.seo-guide-section h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    color: var(--brand-primary);
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.seo-guide-section p, .seo-guide-section li {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* Responsive móvil */
@media (max-width: 900px) {
    .tension-workspace-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

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

    .conv-divider {
        transform: rotate(90deg);
        margin: 0.25rem 0;
    }

    .kpi-number-huge {
        font-size: 2.8rem;
    }
}