/* ============================================================
   SIGUEME.NET - Página de libro
   Requiere las variables --section-color, --section-color-dark
   y --section-color-soft definidas en el <head> de la página.
   ============================================================ */

/* HERO */
.sg-libro-hero {
    background: linear-gradient(135deg, var(--section-color) 0%, var(--section-color-dark) 100%);
    color: #fff;
    padding: 48px 0;
    position: relative;
    overflow: hidden;
}
.sg-libro-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.sg-libro-hero-inner { position: relative; z-index: 2; }
.sg-libro-hero .kicker {
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: rgba(255,255,255,0.85);
    margin-bottom: 14px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}
.sg-libro-hero .kicker .line {
    width: 40px;
    height: 2px;
    background: var(--brand-accent);
}
.sg-libro-hero h1 {
    font-size: 42px;
    font-weight: 900;
    letter-spacing: -1.5px;
    line-height: 1.1;
    margin-bottom: 16px;
    color: #fff;
    text-shadow: 0 2px 20px rgba(0,0,0,0.2);
}
.sg-libro-hero .meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    font-size: 15px;
    color: rgba(255,255,255,0.9);
}
.sg-libro-hero .meta .autor {
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}
.sg-libro-hero .meta .autor::before { content: '✍️'; }

@media (max-width: 700px) {
    .sg-libro-hero { padding: 36px 0; }
    .sg-libro-hero h1 { font-size: 26px; letter-spacing: -0.5px; }
}

/* LAYOUT */
.sg-libro-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 40px;
    align-items: start;
    padding: 32px 0 60px;
}
.sg-libro-main { min-width: 0; }

@media (max-width: 900px) {
    .sg-libro-layout { grid-template-columns: 1fr; gap: 32px; }
}

/* INTRO */
.sg-libro-intro {
    background: linear-gradient(135deg, var(--section-color-soft) 0%, #fff 100%);
    border-left: 5px solid var(--section-color);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: 22px 26px;
    margin-bottom: 28px;
    box-shadow: var(--shadow-sm);
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-primary);
    font-weight: 500;
}
.sg-libro-intro p { margin: 0 0 10px; }
.sg-libro-intro p:last-child { margin-bottom: 0; }

/* CONTENIDO */
.sg-libro-content {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-sm);
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 32px;
}
.sg-libro-content p { margin-bottom: 20px; }
.sg-libro-content h2,
.sg-libro-content h3 {
    margin-top: 32px;
    margin-bottom: 16px;
    color: var(--brand-primary);
    font-weight: 900;
    letter-spacing: -0.5px;
}
.sg-libro-content h2 { font-size: 24px; }
.sg-libro-content h3 { font-size: 20px; }
.sg-libro-content a {
    color: var(--section-color);
    text-decoration: underline;
    text-underline-offset: 3px;
}
.sg-libro-content img { max-width: 100%; height: auto; }
.sg-libro-content blockquote {
    background: var(--section-color-soft);
    border-left: 5px solid var(--section-color);
    padding: 18px 24px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin: 24px 0;
    font-style: italic;
    color: var(--brand-primary);
}

@media (max-width: 700px) {
    .sg-libro-content { padding: 24px 20px; font-size: 16px; }
}

/* NAVEGACIÓN ANTERIOR / SIGUIENTE */
.sg-libro-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 32px 0;
}
.sg-libro-nav a {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 18px 22px;
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--border);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-base);
    display: flex;
    gap: 14px;
    align-items: center;
}
.sg-libro-nav a.is-next {
    flex-direction: row-reverse;
    text-align: right;
}
.sg-libro-nav a:hover {
    border-left-color: var(--section-color);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}
.sg-libro-nav img {
    width: 50px;
    height: 75px;
    object-fit: cover;
    border-radius: 4px;
    flex-shrink: 0;
    box-shadow: 0 3px 8px rgba(0,0,0,0.15);
}
.sg-libro-nav .info { flex: 1; min-width: 0; }
.sg-libro-nav .label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    font-weight: 700;
    margin-bottom: 6px;
}
.sg-libro-nav .title {
    font-size: 15px;
    font-weight: 800;
    color: var(--brand-primary);
    line-height: 1.3;
}
.sg-libro-nav a:hover .title { color: var(--section-color); }

@media (max-width: 560px) {
    .sg-libro-nav { grid-template-columns: 1fr; }
}

/* RELACIONADOS */
.sg-libro-rel {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 32px 28px;
    box-shadow: var(--shadow-sm);
    margin-top: 32px;
}
.sg-libro-rel-titulo {
    font-size: 20px;
    font-weight: 900;
    color: var(--brand-primary);
    letter-spacing: -0.3px;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--section-color);
    display: flex;
    align-items: center;
    gap: 10px;
}
.sg-libro-rel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
}
.sg-libro-rel-item {
    text-decoration: none;
    color: inherit;
    transition: transform var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.sg-libro-rel-item:hover { transform: translateY(-3px); }
.sg-libro-rel-item img {
    aspect-ratio: 2 / 3;
    width: 100%;
    height: auto;
    object-fit: cover;
    border-radius: 6px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}
.sg-libro-rel-item h3 {
    font-size: 14px;
    font-weight: 800;
    color: var(--brand-primary);
    margin: 0;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.sg-libro-rel-item:hover h3 { color: var(--section-color); }
.sg-libro-rel-item .autor {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 600;
}

/* 404 */
.sg-libro-404 {
    text-align: center;
    padding: 80px 0 100px;
}
.sg-libro-404 h1 {
    font-size: 32px;
    font-weight: 900;
    color: var(--brand-primary);
    margin-bottom: 12px;
}
.sg-libro-404 p {
    font-size: 17px;
    color: var(--text-muted);
    margin-bottom: 28px;
}
.sg-libro-404 a.btn-volver {
    display: inline-block;
    background: var(--section-color);
    color: #fff;
    font-weight: 800;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    text-decoration: none;
}