/* ==========================================================================
   pib.com.es — Estilo Institucional, Limpio y Profesional
   Inspiración: Organismos Oficiales, Periodismo Económico (FT / OECD / INE)
   ========================================================================== */

:root {
    /* Paleta Institucional Azul-Financiero */
    --primary-color: #0f4c81;      /* Azul institucional / Serio */
    --primary-hover: #0a3357;
    --accent-blue: #ebf3fa;       /* Fondo secundario suave */
    --positive-color: #2e7d32;     /* Verde de variación positiva */
    --negative-color: #c62828;     /* Rojo de variación negativa */
    
    --text-main: #1e293b;          /* Slate muy oscuro para lectura de alta calidad */
    --text-muted: #64748b;         /* Gris secundario para notas/metadatos */
    --border-color: #e2e8f0;       /* Bordes ultra-suaves */
    --bg-page: #f8fafc;            /* Fondo de página grisáceo moderno */
    --bg-card: #ffffff;
}

* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-page);
    color: var(--text-main);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.65;
    margin: 0;
    padding: 24px 12px;
    -webkit-font-smoothing: antialiased;
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: color 0.15s ease-in-out;
}

a:hover {
    color: var(--primary-hover);
}

/* Layout General */
#border {
    max-width: 860px;
    margin: 0 auto;
}

#container {
    background: var(--bg-card);
    padding: 40px 48px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

/* ==========================================================================
   Header & Navegación Principal (SSI)
   ========================================================================== */

#header {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 20px;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 18px;
}

/* Logotipo */
.brand-logo {
    text-decoration: none;
    font-size: 2.1rem;
    font-weight: 900;
    letter-spacing: -0.8px;
    line-height: 1;
    display: inline-flex;
    align-items: baseline;
}

.brand-logo .logo-main { color: var(--primary-color); }
.brand-logo .logo-sub { color: #0284c7; font-weight: 500; font-size: 1.4rem; }
.brand-logo:hover .logo-main { color: var(--primary-hover); }

/* Badge de Verificación */
.badge-verification {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background-color: var(--accent-blue);
    color: var(--primary-color);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 20px;
    border: 1px solid rgba(15, 76, 129, 0.15);
}

/* Menú de Navegación */
.main-nav {
    margin-bottom: 0;
}

.main-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.main-nav a {
    display: inline-block;
    padding: 8px 18px;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-main);
    text-decoration: none;
    border-radius: 6px;
    background-color: #f1f5f9;
    border: 1px solid var(--border-color);
    transition: all 0.15s ease-in-out;
}

.main-nav a:hover {
    background-color: var(--accent-blue);
    color: var(--primary-color);
    border-color: rgba(15, 76, 129, 0.3);
}

/* Activación Dinámica por data-page */
body[data-page="home"] .main-nav a[data-nav="home"],
body[data-page="ccaa"] .main-nav a[data-nav="ccaa"],
body[data-page="mundial"] .main-nav a[data-nav="mundial"],
body[data-page="percapita"] .main-nav a[data-nav="percapita"] {
    background-color: var(--primary-color);
    color: #ffffff;
    border-color: var(--primary-color);
    box-shadow: 0 2px 4px rgba(15, 76, 129, 0.2);
}

/* ==========================================================================
   Cabecera de Página (H1 + Bajada)
   ========================================================================== */

.page-header {
    margin-top: 24px;
    margin-bottom: 28px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
    font-size: 2.1rem;
    color: var(--primary-color) !important;
    margin: 0 0 8px 0;
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1.25;
}

.page-header .subtitle {
    margin: 0;
    font-size: 1.05rem;
    color: #556980;
    font-weight: 400;
    line-height: 1.5;
}

/* ==========================================================================
   KPI Summary Cards
   ========================================================================== */

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 36px;
}

.kpi-card {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    padding: 16px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
}

.kpi-label {
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 4px;
}

.kpi-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-main);
}

.kpi-value.positive { color: var(--positive-color); }
.kpi-value.negative { color: var(--negative-color); }

.kpi-subtext {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ==========================================================================
   Encabezados de Contenido y Cuerpos de Texto
   ========================================================================== */

h2 {
    color: var(--primary-color);
    font-size: 1.35rem;
    font-weight: 700;
    margin: 36px 0 16px 0;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

p {
    margin: 0 0 18px 0;
    color: #334155;
}

/* Cajas Destacadas (Callouts) */
.callout-box {
    background-color: var(--accent-blue);
    border-left: 4px solid var(--primary-color);
    padding: 16px 20px;
    margin: 24px 0;
    border-radius: 0 8px 8px 0;
    font-size: 0.95rem;
    color: #1e3a8a;
}

/* Fórmulas */
.formula-box {
    background-color: #1e293b;
    color: #f8fafc;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    margin: 24px 0;
}

.formula-title {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #94a3b8;
    margin-bottom: 8px;
}

.formula-box code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 1.3rem;
    font-weight: 700;
    color: #38bdf8;
    display: block;
    margin-bottom: 10px;
}

.formula-legend {
    font-size: 0.82rem;
    color: #cbd5e1;
}

/* Imágenes / Gráficas */
.chart-container {
    margin: 30px 0;
    text-align: center;
}

.chart-container img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

figcaption {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 8px;
    font-style: italic;
}

/* Tablas Estilizadas */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    margin: 24px 0;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
    background-color: #fff;
}

.data-table caption {
    caption-side: top;
    text-align: left;
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--text-muted);
    padding: 8px 12px;
}

.data-table th {
    background-color: #f1f5f9;
    color: var(--text-main);
    font-weight: 700;
    text-align: left;
    padding: 12px 16px;
    border-bottom: 2px solid var(--border-color);
}

.data-table td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-color);
}

.data-table tbody tr:hover {
    background-color: #f8fafc;
}

.data-table tr.highlight-row {
    background-color: var(--accent-blue);
}

.text-right { text-align: right; }
.positive { color: var(--positive-color); font-weight: 600; }
.negative { color: var(--negative-color); font-weight: 600; }

/* Caja de Cita Periodística */
.citation-box {
    background: #f8fafc;
    border: 1px dashed #cbd5e1;
    padding: 18px 20px;
    border-radius: 8px;
    margin: 32px 0;
}

.citation-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.citation-box p {
    font-size: 0.85rem;
    margin-bottom: 8px;
}

.citation-box code {
    display: block;
    background: #ffffff;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.82rem;
    color: #334155;
    user-select: all;
}

/* Enlaces de navegación */
.nav-links {
    list-style: none;
    padding: 0;
    margin: 20px 0;
}

.nav-links li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.98rem;
}

.nav-links li span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Footer Institucional */
#footer {
    margin-top: 48px;
    padding-top: 24px;
    border-top: 2px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
}

#footer p {
    margin: 6px 0;
}

#footer .sources a {
    color: var(--text-muted);
}

#footer .sources a:hover {
    color: var(--primary-color);
}

/* ==========================================================================
   Adaptación Móvil (Responsive)
   ========================================================================== */

@media (max-width: 640px) {
    body {
        padding: 8px;
    }

    #container {
        padding: 20px 16px;
        border-radius: 6px;
    }

    .header-top {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .brand-logo {
        font-size: 1.8rem;
    }

    .main-nav ul {
        gap: 6px;
    }

    .main-nav a {
        padding: 6px 12px;
        font-size: 0.85rem;
    }

    .page-header h1 {
        font-size: 1.65rem;
    }

    .page-header .subtitle {
        font-size: 0.95rem;
    }

    .kpi-grid {
        grid-template-columns: 1fr;
    }
}