* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    /* Paleta moderna y elegante: navy, coral y dorado */
    --bg-1: #0b2545;
    --bg-2: #132f5b;
    --primary: #0b2545;
    --primary-2: #132f5b;
    --accent: #ff6b6b;
    --gold: #f2c94c;
    --muted: #2b2b2b;
    --card: #ffffff;
    --card-border: #ececec;

    background: linear-gradient(135deg, var(--bg-1) 0%, var(--bg-2) 100%);
    min-height: 100vh;
    color: var(--muted);
    margin: 0;
    padding: 0;
}

/* ===== HEADER ===== */
.header-row {
    background: linear-gradient(135deg, #0b2545 0%, #132f5b 100%);
    padding: 25px 20px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 20px;
    flex-wrap: wrap;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.12);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-row h1 {
    font-size: 2.2em;
    color: var(--gold);
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.45);
    display: inline-block;
    padding: 8px 18px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 10px;
    margin: 0 auto;
    flex: none;
    text-align: center;
}

.btn-regreso {
    background: rgba(255, 255, 255, 0.12);
    color: var(--gold);
    padding: 11px 18px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1em;
    font-weight: bold;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.btn-regreso:hover {
    background: rgba(255, 255, 255, 0.18);
    transform: translateX(-3px);
}

.btn-regreso svg { display: block; color: currentColor; }
.btn-regreso .btn-text { display: inline-block; }

/* ===== CONTENIDO PRINCIPAL ===== */
.cajita {
    max-width: 900px;
    margin: 50px auto;
    padding: 50px;
    background: rgba(5, 3, 27, 0.95);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(245, 245, 245, 0.15);
    border-left: 5px solid var(--gold);
    color: var(--muted);
    font-size: 1.1em;
    line-height: 1.8;
}

.cajita h1 {
    margin-bottom: 30px;
    font-size: 2.2em;
    color: var(--primary);
    font-weight: 700;
}

/* Asegurar que el título del header sea dorado (más específico que .cajita h1) */
.header-row > h1 {
    color: var(--gold);
    font-weight: 800;
    text-shadow: 0 2px 6px rgba(0,0,0,0.45);
}

.cajita p {
    color: #dbdbdb;
    margin-bottom: 20px;
    text-align: justify;
}

.cajita hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
    margin: 20px 0;
}

@media screen and (max-width: 900px) {
    .header-row h1 { font-size: 1.8em; }
    .cajita { margin: 30px 15px; padding: 30px; }
    .cajita h1 { font-size: 1.8em; }
}

@media screen and (max-width: 768px) {
    .header-row {
        padding-top: 60px;
    }
}

@media screen and (max-width: 600px) {
    .header-row { flex-direction: column; }
    .header-row h1 { flex: 1; }
    .btn-regreso { width: 100%; justify-content: center; }
    .cajita { margin: 20px 10px; padding: 20px; font-size: 1em; }
    .cajita h1 { font-size: 1.5em; }
}

/* Centrar solo el título en pantallas anchas (PC/Laptop) y mantener el botón a la izquierda */
@media screen and (min-width: 900px) {
    .header-row {
        justify-content: center;
    }
    .btn-regreso {
        position: absolute;
        left: 22px;
        top: 50%;
        transform: translateY(-50%);
    }
    .header-row h1 {
        margin: 0 auto;
    }
}