/* ===== REDESIGNED STYLES ===== */
:root {
    --primary: #1a2b4c;
    --primary-light: #2a4070;
    --accent: #00b894;
    --accent-dark: #009975;
    --apple-blue: #0071e3;
    --google-green: #34a853;
    --google-red: #ea4335;
    --google-yellow: #fbbc04;
    --google-blue: #4285f4;
    --light-bg: #f8fafc;
    --border-light: #e9ecef;
    --text-dark: #1e293b;
    --text-muted: #64748b;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.05);
    --shadow-md: 0 10px 30px rgba(0,0,0,0.08);
    --shadow-lg: 0 20px 40px rgba(0,0,0,0.12);
}

/* ===== BASE STYLES ===== */
* {
    box-sizing: border-box;
}

body {
    font-size: 1rem;
    letter-spacing: .01em;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
}

h1, h2, h3, h4, h5 {
    font-weight: 600;
    line-height: 1.3;
}

/* ===== UTILITY CLASSES ===== */
.section-tag {
    color: var(--accent);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--primary);
}

.petroleum-line {
    display: block;
    width: 80px;
    height: 2px;
    border-top: 2px var(--accent) solid;
}

.faq-line {
    display: block;
    width: 25%;
    height: 2px;
    border-top: 3px var(--accent) solid;
    margin-left: 36%;
}

.contact-line {
    display: block;
    width: 25%;
    height: 2px;
    border-top: 3px var(--accent) solid;
    margin-left: 8%;
}

.accent {
    color: var(--accent);
}

/* ===== NAVIGATION ===== */
.navbar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%) !important;
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
}

.navbar-brand img {
    max-height: 45px;
    width: auto;
}

.nav-link {
    font-weight: 500;
    padding: 0.5rem 1.25rem !important;
    transition: all 0.2s ease;
    border-radius: 8px;
}

.nav-link:hover {
    background: rgba(255,255,255,0.1);
}

/* ===== JUMBOTRON ===== */
#jumbotron {
    padding: 5rem 1.5rem 4rem;
    background: linear-gradient(180deg, #fff 0%, var(--light-bg) 100%);
}

#jumbotron h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin: 1.5rem 0;
}

#jumbotron .accent {
    border-bottom: 3px solid rgba(0,184,148,0.3);
}

#jumbotron p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 2rem;
}

.badge-pill {
    background: white;
    border: 1px solid var(--border-light);
    color: var(--text-dark);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    margin: 0 0.25rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
}

.badge-pill:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ===== BUTTONS ===== */
.btn-primary-custom {
    background: var(--primary);
    color: white;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    border: none;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.btn-primary-custom:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.btn-outline-custom {
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 0.75rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-outline-custom:hover {
    background: var(--primary);
    color: white;
}

.btn-submit {
    background: var(--primary);
    color: white;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    width: 100%;
    border: none;
    transition: all 0.3s;
}

.btn-submit:hover {
    background: var(--primary-light);
}

.btn-whatsapp {
    background: #25D366;
    color: white;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.3s;
}

.btn-whatsapp:hover {
    background: #1da851;
    color: white;
    transform: translateY(-2px);
}

/* ===== ABOUT SECTION ===== */
#aboutus {
    background: white;
    padding: 5rem 0;
}

#aboutus h5 {
    font-size: 24px;
    font-weight: 800;
}

.about-highlight {
    font-size: 1.35rem;
    font-weight: 500;
    color: var(--primary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

/* ===== SERVICES SECTION ===== */
#petroleum-page {
    background: var(--light-bg);
    padding: 5rem 0;
}

#petroleum-page h3,
#petroleum-page p {
    color: #23344f;
}

.service-card {
    background: white;
    border-radius: 20px;
    padding: 2.5rem 2rem;
    height: 100%;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-light);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.service-icon {
    width: 60px;
    height: 60px;
    background: rgba(0,184,148,0.1);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.service-icon i {
    font-size: 28px;
    color: var(--accent);
}

.service-card h5 {
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.service-card p {
    color: var(--text-muted);
    margin-bottom: 0;
}

/* ===== TESTIMONIALS SECTION ===== */
#testimonials {
    background: white;
    padding: 5rem 0;
}

.testimonial-card {
    background: var(--light-bg);
    border-radius: 20px;
    padding: 2.5rem;
    height: 100%;
    border: 1px solid var(--border-light);
    transition: all 0.3s;
}

.testimonial-card:hover {
    background: white;
    box-shadow: var(--shadow-lg);
}

.quote-icon {
    color: var(--accent);
    opacity: 0.3;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.testimonial-text {
    font-size: 1.1rem;
    font-style: italic;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.testimonial-author {
    display: flex;
    align-items: center;
}

.author-avatar {
    width: 50px;
    height: 50px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    margin-right: 1rem;
}

.author-info h6 {
    margin: 0;
    font-weight: 600;
}

.author-info small {
    color: var(--text-muted);
}

.rating {
    color: #ffc107;
    margin-bottom: 0.5rem;
}

/* ===== FAQ SECTION ===== */
#faq {
    background: var(--light-bg);
    padding: 5rem 0;
}

#faq h5 {
    font-size: 2.25rem;
    line-height: 1.1667;
    letter-spacing: .02em;
    font-weight: 300;
    padding-bottom: 15px;
}

.accordion-item {
    border: none;
    margin-bottom: 1rem;
    border-radius: 12px !important;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.accordion-button {
    font-weight: 600;
    padding: 1.25rem 1.5rem;
    background: white;
}

.accordion-button:not(.collapsed) {
    background: var(--primary);
    color: white;
}

.accordion-button:focus {
    box-shadow: none;
    border-color: transparent;
}

.accordion-body {
    background: white;
    padding: 1.5rem;
}

/* ===== RESOURCES SECTION ===== */
#resources {
    background: white;
    padding: 5rem 0;
}

.resource-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    height: 100%;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all 0.3s ease;
}

.resource-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.resource-img {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.resource-content {
    padding: 1.75rem;
}

.resource-category {
    display: inline-block;
    background: rgba(0,184,148,0.1);
    color: var(--accent-dark);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    margin-bottom: 0.75rem;
}

.resource-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.75rem;
}

.resource-card h4 a {
    color: var(--text-dark);
    text-decoration: none;
    transition: color 0.2s;
}

.resource-card h4 a:hover {
    color: var(--accent);
}

.resource-card p {
    font-size: 0.95rem;
    margin-bottom: 1.25rem;
}

.resource-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--border-light);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.read-more {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.read-more:hover {
    color: var(--accent-dark);
}

.read-more i {
    font-size: 0.75rem;
    transition: transform 0.2s;
}

.read-more:hover i {
    transform: translateX(3px);
}

/* ===== CONTACT SECTION ===== */
#contactus {
    padding: 5rem 0;
}

.contact-card {
    background: white;
    border-radius: 24px;
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
}

.form-control, .form-select {
    padding: 0.875rem 1.25rem;
    border-radius: 12px;
    border: 1.5px solid var(--border-light);
    background: var(--light-bg);
    transition: all 0.2s;
}

.form-control:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(0,184,148,0.1);
    background: white;
}

#whatsapp {
    display: flex;
    justify-content: center;
    align-items: center;
}

#whatsapp a {
    color: #fff;
    text-decoration: none;
}

/* ===== COUNTRIES LINKS ===== */
#countries-links {
    background: var(--primary);
    padding: 4rem 0;
    color: white;
}

.country-btn {
    background: rgba(255,255,255,0.1);
    color: white;
    border: 1px solid rgba(255,255,255,0.2);
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
}

.country-btn:hover {
    background: white;
    color: var(--primary);
}

/* ===== FOOTER ===== */
#footer {
    background: #0f1a2e;
    color: #94a3b8;
    padding: 4rem 0 2rem;
}

#footer h6 {
    color: white;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

#footer a {
    color: #94a3b8;
    text-decoration: none;
    transition: color 0.2s;
}

#footer a:hover {
    color: var(--accent);
}

#footer ul {
    padding-left: 0;
}

#footer ul li {
    text-decoration: none;
    list-style-type: none;
    padding-left: 0;
}

#footer ul li a {
    text-decoration: none;
    text-transform: none;
    color: #fff;
}

.footer-sub {
    font-size: large;
    font-weight: 700;
}

.footer-logo {
    filter: brightness(0) invert(1);
    max-width: 200px;
    margin-bottom: 1.5rem;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.05);
    border-radius: 50%;
    margin-right: 0.75rem;
    transition: all 0.2s;
}

.social-links a:hover {
    background: var(--accent);
    color: white;
}

#copyright span {
    font-size: 12px;
    letter-spacing: 0;
}

/* ===== BLOG/ARTICLE STYLES ===== */
.page-header,
.article-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    padding: 4rem 0 3rem;
}

.breadcrumb {
    margin-bottom: 1.5rem;
}

.breadcrumb a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
}

.breadcrumb a:hover { color: white; }
.breadcrumb .active { color: white; }

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    color: rgba(255,255,255,0.8);
    font-size: 0.95rem;
    margin: 1.5rem 0;
}

.article-meta i { margin-right: 0.5rem; }

.article-category {
    background: var(--accent);
    color: white;
    padding: 0.25rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: inline-block;
    margin-bottom: 1rem;
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 0;
}

.article-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin: 2.5rem 0 1.5rem;
    color: var(--primary);
}

.article-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
    color: var(--primary);
}

.article-content p {
    margin-bottom: 1.25rem;
    color: var(--text-dark);
}

.article-content ul, .article-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

/* Table of Contents */
.toc-card {
    background: var(--light-bg);
    border-radius: 16px;
    padding: 1.5rem 2rem;
    margin: 2rem 0;
    border-left: 4px solid var(--accent);
}

.toc-card h5 {
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--primary);
}

.toc-card ul {
    margin-bottom: 0;
    padding-left: 0;
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.5rem 1rem;
}

.toc-card li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.toc-card li:before {
    content: "→";
    color: var(--accent);
    position: absolute;
    left: 0;
    font-weight: 600;
}

.toc-card a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
}

.toc-card a:hover { color: var(--accent); }

/* Info & Warning Boxes */
.info-box {
    background: rgba(0,184,148,0.08);
    border-radius: 16px;
    padding: 1.5rem 2rem;
    margin: 2rem 0;
    border: 1px solid rgba(0,184,148,0.2);
}

.info-box i {
    color: var(--accent);
    font-size: 1.5rem;
    margin-right: 1rem;
}

.warning-box {
    background: rgba(245,158,11,0.08);
    border-radius: 16px;
    padding: 1.5rem 2rem;
    margin: 2rem 0;
    border: 1px solid rgba(245,158,11,0.3);
}

.warning-box i {
    color: #f59e0b;
    font-size: 1.5rem;
    margin-right: 1rem;
}

/* Step Cards */
.step-card {
    background: white;
    border-radius: 16px;
    padding: 1.75rem;
    margin: 1.5rem 0;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.step-number {
    background: var(--primary);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

/* Checklists */
.checklist {
    list-style: none;
    padding-left: 0;
}

.checklist li {
    padding-left: 2rem;
    position: relative;
    margin-bottom: 0.75rem;
}

.checklist li:before {
    content: "✓";
    color: var(--accent);
    font-weight: 700;
    position: absolute;
    left: 0;
}

.xlist {
    list-style: none;
    padding-left: 0;
}

.xlist li {
    padding-left: 2rem;
    position: relative;
    margin-bottom: 0.75rem;
}

.xlist li:before {
    content: "✗";
    color: #dc3545;
    font-weight: 700;
    position: absolute;
    left: 0;
}

/* CTA Card */
.cta-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 24px;
    padding: 3rem;
    text-align: center;
    color: white;
    margin: 3rem 0;
}

.cta-card h3 {
    color: white;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

/* Author Card */
.author-card {
    background: var(--light-bg);
    border-radius: 20px;
    padding: 2rem;
    margin: 3rem 0 2rem;
    display: flex;
    gap: 1.5rem;
    align-items: center;
    border: 1px solid var(--border-light);
}

.author-avatar-lg {
    width: 100px;
    height: 100px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    font-weight: 600;
    flex-shrink: 0;
}

.author-info h5 {
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.author-info .badge {
    background: var(--accent);
    color: white;
    font-weight: 500;
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
}

/* Related Posts */
.related-post-card {
    background: white;
    border-radius: 16px;
    padding: 1.5rem;
    height: 100%;
    border: 1px solid var(--border-light);
    transition: all 0.3s;
}

.related-post-card:hover {
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.related-post-card h6 {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.related-post-card a {
    color: var(--text-dark);
    text-decoration: none;
}

.related-post-card a:hover { color: var(--accent); }

/* Platform Cards */
.platform-card {
    background: white;
    border-radius: 24px;
    padding: 2rem;
    height: 100%;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    transition: all 0.3s;
}

.platform-card.apple { border-top: 5px solid var(--apple-blue); }
.platform-card.google { border-top: 5px solid var(--google-green); }

.platform-icon {
    width: 70px;
    height: 70px;
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.platform-icon.apple { background: var(--apple-blue); }

.platform-icon.google { 
    background: linear-gradient(135deg, var(--google-blue) 0%, var(--google-green) 50%, var(--google-yellow) 75%, var(--google-red) 100%); 
}

.platform-icon i { font-size: 36px; color: white; }

/* Comparison Tables */
.comparison-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 2rem 0;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.comparison-table th {
    background: var(--primary);
    color: white;
    padding: 1.2rem 1.5rem;
    font-weight: 600;
    text-align: left;
}

.comparison-table td {
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
    background: white;
}

.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table .highlight-row { background: rgba(0,184,148,0.05); }
.comparison-table .apple-header { background: var(--apple-blue); }
.comparison-table .google-header { background: var(--google-green); }

/* VS Badge */
.vs-badge {
    display: inline-block;
    background: var(--accent);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.25rem;
    margin: 1rem 0;
}

/* Icon Cards */
.icon-card {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    height: 100%;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all 0.3s;
}

.icon-card:hover { 
    transform: translateY(-5px); 
    box-shadow: var(--shadow-lg); 
}

.icon-circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.icon-circle.registration { background: #4a90e2; }
.icon-circle.duns { background: var(--accent); }
.icon-circle i { font-size: 36px; color: white; }

/* Timeline Visual */
.timeline-visual {
    display: flex;
    flex-wrap: wrap;
    margin: 2rem 0;
}

.timeline-step {
    flex: 1;
    min-width: 150px;
    text-align: center;
    padding: 1rem;
    position: relative;
}

.timeline-step:not(:last-child):after {
    content: "→";
    position: absolute;
    right: -10px;
    top: 30px;
    font-size: 1.5rem;
    color: var(--accent);
}

.timeline-icon {
    width: 60px;
    height: 60px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-weight: 700;
    font-size: 1.25rem;
}

/* Stats Highlight */
.stat-highlight {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    border-radius: 20px;
    padding: 2.5rem;
    margin: 2rem 0;
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Benefit Cards */
.benefit-card {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    margin: 1.5rem 0;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    transition: all 0.3s;
}

.benefit-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.benefit-icon {
    width: 60px;
    height: 60px;
    background: rgba(0,184,148,0.1);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.benefit-icon i {
    font-size: 28px;
    color: var(--accent);
}

.benefit-content h4 {
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary);
}

.benefit-content p {
    margin-bottom: 0;
    color: var(--text-muted);
}

.benefit-tag {
    display: inline-block;
    background: var(--light-bg);
    padding: 0.25rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Category Section */
.category-section {
    margin: 3rem 0;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.category-header i {
    font-size: 2rem;
    color: var(--accent);
    background: rgba(0,184,148,0.1);
    padding: 0.75rem;
    border-radius: 16px;
}

.category-header h3 {
    margin: 0;
    font-size: 1.75rem;
}

/* Comparison Box */
.comparison-box {
    background: var(--light-bg);
    border-radius: 20px;
    padding: 2rem;
    margin: 2rem 0;
}

.comparison-row {
    display: flex;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-light);
}

.comparison-row:last-child { border-bottom: none; }

.comparison-label { width: 40%; font-weight: 600; }
.comparison-with { width: 25%; color: #dc3545; }
.comparison-without { width: 35%; color: var(--accent); }

/* Blog Cards */
.blog-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all 0.3s;
    height: 100%;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.blog-img {
    height: 200px;
    background-color: var(--primary-light);
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.blog-content {
    padding: 1.75rem;
}

.blog-category {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.blog-title {
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.blog-title a {
    color: var(--text-dark);
    text-decoration: none;
}

.blog-title a:hover { color: var(--accent); }

.blog-meta {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Sidebar */
.sidebar-card {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid var(--border-light);
    margin-bottom: 2rem;
}

/* ===== RESPONSIVE STYLES ===== */
@media (max-width: 768px) {
    .section-title { font-size: 2rem; }
    .contact-card { padding: 1.5rem; }
    #jumbotron { padding: 3rem 1rem; }
    .service-card { padding: 1.5rem; }
    
    .article-content h2 { font-size: 1.75rem; }
    .author-card { flex-direction: column; text-align: center; }
    .cta-card { padding: 2rem 1.5rem; }
    .cta-card h3 { font-size: 1.5rem; }
    
    .benefit-card { flex-direction: column; }
    .toc-card ul { grid-template-columns: 1fr; }
    .comparison-row { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
    .comparison-label, .comparison-with, .comparison-without { width: 100%; }
    .stat-number { font-size: 2.5rem; }
    .resource-img { height: 140px; }
    .resource-content { padding: 1.5rem; }
    .resource-card h4 { font-size: 1.1rem; }
    .timeline-step:not(:last-child):after { display: none; }
    .comparison-table { display: block; overflow-x: auto; }
}

/* ===== CUSTOM SPACING UTILITIES ===== */
@media (min-width: 992px) {
    #jumbotron h1 { font-size: 70px; font-weight: 800; }
    #jumbotron p { font-size: 24px; font-weight: 400; }
    #aboutus p { font-size: 20px; }
    
    #petroleum-page h3 {
        font-size: 2.25rem;
        line-height: 1.1667;
        letter-spacing: .02em;
        font-weight: 300;
        padding-bottom: 15px;
    }

    .psy-4 { padding-top: 1.5rem !important; padding-bottom: 1.5rem !important; } 
    .psx-4 { padding-right: 3rem !important; padding-left: 3rem !important; }
    .psy-5 { padding-top: 3rem !important; padding-bottom: 3rem !important; }
    .psx-5 { padding-right: 3rem !important; padding-left: 3rem !important; }
    .pcs-5 { padding-left: 3rem !important; }
    .pct-5 { padding-top: 3rem !important; }
    .pcb-5 { padding-bottom: 3rem !important; }
    .pce-5 { padding-left: 60% !important; }
    .pn-5 { padding: 3rem !important; }
    .pn1-5 { margin-bottom: 3rem !important; padding-left: 3rem !important; padding-right: 3rem !important; }
}

@media (max-width: 720px) { 
    #jumbotron h1 { font-size: 40px; font-weight: 800; }
    #jumbotron p { font-size: 16px; font-weight: 400; }
    #aboutus p { font-size: 16px; }
    #petroleum-card { margin-bottom: 10px; }
    
    #petroleum-page h3 {
        font-size: 2rem;
        line-height: 1.1667;
        letter-spacing: .02em;
        font-weight: 300;
        padding-bottom: 15px;
    }

    .pn-5 { padding: 0rem !important; }
    .pcy-2 { padding-top: .5rem !important; padding-bottom: .5rem !important; }
    .pcx-2 { padding-left: .5rem !important; padding-right: .5rem !important; }
    .pst-3 { padding-top: 1rem !important; }
    .pn1-5 { margin-bottom: 0rem !important; padding-left: 0rem !important; padding-right: 0rem !important; }
}