/* premium-theme.css */
:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --bg-color: #f8fafc;
    --text-main: #334155;
    --text-muted: #64748b;
    --accent: #eab308;
    --card-bg: #ffffff;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    line-height: 1.8;
    font-size: 18px;
    -webkit-font-smoothing: antialiased;
}

.nav {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav a {
    color: #ffffff;
    font-weight: 800;
    font-size: 1.6rem;
    text-decoration: none;
    letter-spacing: -0.5px;
}

main {
    max-width: 850px;
    margin: 50px auto;
    background: var(--card-bg);
    padding: 60px;
    border-radius: 24px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.06);
    border: 1px solid #e2e8f0;
}

h1 {
    color: #0f172a;
    font-weight: 900;
    font-size: 3rem;
    line-height: 1.2;
    margin-top: 0;
    letter-spacing: -1px;
    border-bottom: 4px solid var(--accent);
    padding-bottom: 20px;
    margin-bottom: 30px;
}

h2 {
    color: var(--primary-color);
    margin-top: 60px;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

h3 {
    color: #1e293b;
    margin-top: 40px;
    font-size: 1.5rem;
    font-weight: 700;
}

p {
    margin-bottom: 24px;
    color: #475569;
}

ul {
    background: #fefce8;
    padding: 30px 30px 30px 50px;
    border-radius: 16px;
    border-left: 6px solid var(--accent);
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
}

li {
    margin-bottom: 12px;
    font-weight: 500;
}

.hero-img {
    width: 100%;
    height: 350px;
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    border-radius: 16px;
    margin-bottom: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    font-weight: 900;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.2);
}

/* Affiliate Buttons */
.amazon-btn-wrapper {
    text-align: center;
    margin: 45px 0;
}

.amazon-btn {
    display: inline-block;
    background: linear-gradient(to bottom, #fcd34d, #f59e0b);
    color: #111;
    font-weight: 900;
    font-size: 1.3rem;
    padding: 20px 50px;
    border-radius: 12px;
    text-decoration: none;
    box-shadow: 0 10px 25px rgba(245, 158, 11, 0.4), inset 0 2px 0 rgba(255,255,255,0.4);
    border: 1px solid #d97706;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.amazon-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(245, 158, 11, 0.5), inset 0 2px 0 rgba(255,255,255,0.4);
}

.amazon-subtext {
    font-size: 0.9rem;
    color: #64748b;
    margin-top: 12px;
    font-weight: 600;
}

/* Interlinking Widget */
.related-articles {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 2px dashed #cbd5e1;
}

.related-articles h3 {
    margin-top: 0;
    color: #0f172a;
    font-size: 1.8rem;
}

.related-list {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
    background: transparent;
    border: none;
    box-shadow: none;
}

.related-list a {
    display: block;
    background: #f1f5f9;
    padding: 20px 25px;
    border-radius: 16px;
    color: var(--primary-color);
    font-weight: 800;
    text-decoration: none;
    transition: all 0.2s;
    border: 1px solid #e2e8f0;
}

.related-list a:hover {
    background: #e0e7ff;
    transform: translateX(8px);
    border-color: #c7d2fe;
}

/* Map Fuel Specific Overrides */
.grid { display: grid; grid-template-columns: 1fr; gap: 24px; margin: 30px 0; }
@media(min-width: 900px) { .grid-2 { grid-template-columns: 1fr 1fr; } .grid-3 { grid-template-columns: 1fr 1fr 1fr; } }
.card { background: var(--card-bg); border-radius: 20px; padding: 25px; box-shadow: 0 10px 25px rgba(0,0,0,0.05); border: 1px solid #f1f5f9; }
.cta { background: linear-gradient(135deg, var(--bg-color), #f1f5f9); text-align: center; }
.cta .btn { display: inline-block; background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)); color: white; padding: 15px 30px; border-radius: 999px; text-decoration: none; font-weight: 800; font-size: 1.2rem; box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3); transition: all 0.3s; margin-top: 15px; }
.cta .btn:hover { transform: scale(1.05); box-shadow: 0 8px 25px rgba(37, 99, 235, 0.4); }
.price-cols { display: grid; grid-template-columns: 1fr; gap: 20px; margin-top: 20px; }
@media(min-width: 800px) { .price-cols { grid-template-columns: 1fr 1fr; } }
.price-col { background: #f8fafc; border-radius: 16px; padding: 20px; border: 1px solid #e2e8f0; }
.precio { font-weight: 900; color: var(--primary-color); font-size: 1.2rem; }
.price-list { list-style: decimal inside; padding: 0; background: transparent; border: none; box-shadow: none; }
.price-list li { padding: 10px 0; border-bottom: 1px dashed #cbd5e1; }
.price-list li:last-child { border-bottom: none; }
.price-meta { font-size: 0.85rem; color: #94a3b8; }

@media(max-width: 768px) {
    main { padding: 30px; margin: 20px; border-radius: 16px; }
    h1 { font-size: 2.2rem; }
    .amazon-btn { width: 100%; box-sizing: border-box; padding: 20px; }
}