/* ============================================================
   teoria.css — Estilos compartidos para páginas de teoría
   Módulo: Sistemas Eléctricos en Centrales
   ============================================================ */

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
    background-color: #f4f7f6;
}

.container {
    background-color: #fff;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    /* El color del borde superior se define en cada página con la clase .tema-* */
    border-top: 6px solid #2c3e50;
}

/* --- Colores de acento por tema --- */
.container.tema-azul  { border-top-color: #2c3e50; }
.container.tema-naranja { border-top-color: #e67e22; }
.container.tema-morado  { border-top-color: #8e44ad; }
.container.tema-verde   { border-top-color: #27ae60; }

h1 {
    color: #2c3e50;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
    text-align: center;
}

/* h2 color se sobreescribe en cada HTML con variable CSS --accent */
h2 {
    color: var(--accent, #2980b9);
    margin-top: 30px;
}

.highlight {
    background-color: var(--highlight-bg, #e8f4fd);
    border-left: 5px solid var(--accent, #2980b9);
    padding: 15px;
    margin: 20px 0;
    font-style: italic;
}

.formula {
    text-align: center;
    font-size: 1.2em;
    background: #2c3e50;
    color: #ecf0f1;
    padding: 15px;
    border-radius: 5px;
    margin: 20px 0;
    font-family: "Courier New", Courier, monospace;
}

.warning {
    background-color: #fdf2f2;
    border-left: 5px solid #e74c3c;
    padding: 15px;
    margin: 20px 0;
}

details {
    background: #f9f9f9;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 10px;
    cursor: pointer;
}

details[open] {
    border-color: var(--accent, #2980b9);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

summary {
    font-weight: bold;
    color: #2c3e50;
}

.exercise-box {
    background-color: var(--exercise-bg, #f0f4f8);
    padding: 20px;
    border-radius: 8px;
    margin-top: 30px;
    border: 1px dashed var(--accent, #2980b9);
}

.footer {
    margin-top: 40px;
    font-size: 0.9em;
    color: #7f8c8d;
    text-align: center;
}

.btn-back {
    display: inline-block;
    margin-bottom: 20px;
    text-decoration: none;
    color: var(--accent, #2980b9);
    font-weight: bold;
}

.btn-back:hover {
    text-decoration: underline;
}