/* ==========================================================================
   DISEÑO PREMIUM CALCULADORA COSTE COCHE (ESTILO FINTECH)
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: #f8fafc;
    color: #334155;
    line-height: 1.6;
    padding: 3rem 1rem;
}

.container {
    max-width: 1050px;
    margin: 0 auto;
}

/* ENLACE VOLVER AL PORTAL */
.back-link {
    display: inline-block;
    font-size: 0.85rem;
    color: #f43f5e; /* Tono rojo/rosa corporativo para esta sección de costes */
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 1rem;
    transition: color 0.2s;
}

.back-link:hover {
    color: #be123c;
}

/* CABECERA */
header {
    margin-bottom: 3rem;
    border-left: 4px solid #f43f5e;
    padding-left: 1.5rem;
}

header h1 {
    font-size: 2.25rem;
    font-weight: 800;
    color: #0f172a;
    letter-spacing: -0.04em;
    margin-bottom: 0.5rem;
}

header p {
    color: #64748b;
    font-size: 1.05rem;
    max-width: 800px;
}

/* LAYOUT DE DOS COLUMNAS ASIMÉTRICAS */
.calculator-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    margin-bottom: 4rem;
}

@media (min-width: 768px) {
    .calculator-layout {
        grid-template-columns: 1.1fr 0.9fr;
    }
}

/* PANEL IZQUIERDO: INPUTS */
.input-panel {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.01);
}

.input-panel h2, .results-panel h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 1.75rem;
    letter-spacing: -0.02em;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: #475569;
    margin-bottom: 0.5rem;
}

.input-panel input[type="number"] {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-weight: 500;
    color: #0f172a;
    background-color: #f8fafc;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    outline: none;
    transition: all 0.2s;
}

.input-panel input[type="number"]:focus {
    border-color: #f43f5e;
    background-color: #ffffff;
    box-shadow: 0 0 0 3px rgba(244, 63, 94, 0.1);
}

/* SLIDER DE AÑOS INTEGRADO */
.range-container {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    background-color: #f8fafc;
    padding: 0.5rem 1rem;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
}

.range-container input[type="range"] {
    flex: 1;
    accent-color: #f43f5e;
    cursor: pointer;
}

.range-badge {
    font-size: 0.85rem;
    font-weight: 700;
    color: #f43f5e;
    background-color: #fff1f2;
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    white-space: nowrap;
}

/* PANEL DERECHO: RESULTADOS PRESTIGIO */
.results-panel {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 10px 15px -3px rgba(15, 23, 42, 0.02);
    display: flex;
    flex-direction: column;
}

.main-metric {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    color: #ffffff;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    margin-bottom: 1.5rem;
}

.metric-label {
    display: block;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #94a3b8;
    margin-bottom: 0.5rem;
}

.metric-value {
    font-size: 2.75rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    color: #fff;
}

/* REJILLA DE SUBMETRICAS */
.metrics-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

@media (min-width: 480px) {
    .metrics-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.metric-card {
    padding: 1.25rem;
    border-radius: 10px;
    border: 1px solid #e2e8f0;
}

.metric-card.alert { background-color: #fff5f5; border-color: #fee2e2; }
.metric-card.info { background-color: #f8fafc; border-color: #e2e8f0; }

.metric-card h3 {
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    color: #64748b;
    margin-bottom: 0.25rem;
}

.metric-card p {
    font-size: 1.35rem;
    font-weight: 700;
    color: #0f172a;
}

.metric-card small {
    display: block;
    font-size: 0.78rem;
    color: #64748b;
    margin-top: 0.25rem;
}

/* CAJA DE IMPACTO: COSTE DE OPORTUNIDAD */
.opportunity-box {
    background-color: #fff7ed;
    border: 1px solid #ffedd5;
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: auto; /* Empuja el bloque al fondo en pantallas grandes */
}

.opportunity-box h3 {
    font-size: 0.95rem;
    color: #c2410c;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.opportunity-box p {
    font-size: 0.88rem;
    color: #7c2d12;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.opportunity-value {
    font-size: 2.25rem;
    font-weight: 800;
    color: #ea580c;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 0.35rem;
}

.opportunity-box small {
    font-size: 0.78rem;
    color: #9a3412;
    display: block;
}

/* SECCIÓN SEO TEXTO LARGO */
.seo-content {
    margin-top: 5rem;
    padding-top: 3rem;
    border-top: 1px solid #e2e8f0;
}

.seo-content h2 {
    font-size: 1.5rem;
    color: #0f172a;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
    font-weight: 800;
}

.seo-content h3 {
    font-size: 1.15rem;
    color: #0f172a;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    font-weight: 700;
}

.seo-content p {
    color: #475569;
    font-size: 0.98rem;
    margin-bottom: 1.25rem;
    text-align: justify;
}

.seo-content ul {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
    color: #475569;
    font-size: 0.98rem;
}

.seo-content li {
    margin-bottom: 0.75rem;
}

.seo-content strong {
    color: #0f172a;
}

/* PIE DE PÁGINA */
footer {
    margin-top: 5rem;
    text-align: center;
    font-size: 0.8rem;
    color: #94a3b8;
    border-top: 1px solid #e2e8f0;
    padding-top: 2rem;
}

/* Efecto hover suave para el botón de Buy Me a Coffee */
.support-section a:hover img, .privacy-box a:hover img {
  transform: scale(1.05);
  filter: brightness(1.05);
}