/* Professional Payment Processing Site - 2026 - SEO Optimized */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=Cal+Sans:wght@600&display=swap');

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

:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --accent: #10b981;
    --dark: #0f172a;
    --gray-900: #0f172a;
    --gray-800: #1e293b;
    --gray-700: #334155;
    --gray-600: #475569;
    --gray-500: #64748b;
    --gray-400: #94a3b8;
    --gray-300: #cbd5e1;
    --gray-200: #e2e8f0;
    --gray-100: #f1f5f9;
    --gray-50: #f8fafc;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--gray-700);
    background: #ffffff;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
header {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.95);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--dark);
    letter-spacing: -0.02em;
    text-decoration: none;
}

.header-nav {
    display: flex;
    gap: 32px;
}

.header-nav a {
    color: var(--gray-600);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s;
}

.header-nav a:hover {
    color: var(--primary);
}

/* Breadcrumbs */
.breadcrumbs {
    padding: 20px 0;
    background: var(--gray-50);
    font-size: 14px;
}

.breadcrumbs a {
    color: var(--gray-600);
    text-decoration: none;
}

.breadcrumbs a:hover {
    color: var(--primary);
}

.breadcrumbs span {
    color: var(--gray-400);
    margin: 0 8px;
}

/* Hero Section */
.hero-section {
    padding: 80px 0 100px;
    background: linear-gradient(180deg, var(--gray-50) 0%, white 100%);
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    color: var(--dark);
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 20px;
    line-height: 1.6;
    color: var(--gray-600);
    margin-bottom: 48px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.btn-hero {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.2s;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.btn-hero:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
}

/* Article Header */
.article-header {
    padding: 60px 0 40px;
    background: var(--gray-50);
    text-align: center;
}

.article-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    color: var(--dark);
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.article-meta {
    font-size: 15px;
    color: var(--gray-500);
    display: flex;
    gap: 16px;
    justify-content: center;
    align-items: center;
    margin-bottom: 32px;
}

/* Author Box */
.author-box {
    display: flex;
    gap: 20px;
    align-items: center;
    max-width: 800px;
    margin: 48px auto;
    padding: 32px;
    background: var(--gray-50);
    border-radius: 12px;
    border: 1px solid var(--gray-200);
}

.author-image {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.author-info h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
}

.author-info .author-title {
    font-size: 14px;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 8px;
}

.author-info p {
    font-size: 14px;
    line-height: 1.6;
    color: var(--gray-600);
    margin-bottom: 12px;
}

.author-social {
    display: flex;
    gap: 12px;
}

.author-social a {
    font-size: 13px;
    color: var(--gray-500);
    text-decoration: none;
}

.author-social a:hover {
    color: var(--primary);
}

/* Article Content */
.article-content {
    max-width: 800px;
    margin: 0 auto 60px;
    padding: 0 24px;
}

.article-content h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--dark);
    margin-top: 48px;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.article-content h3 {
    font-size: 24px;
    font-weight: 600;
    color: var(--gray-800);
    margin-top: 36px;
    margin-bottom: 16px;
}

.article-content p {
    font-size: 18px;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 24px;
}

.article-content ul, .article-content ol {
    margin-left: 28px;
    margin-bottom: 24px;
}

.article-content li {
    font-size: 18px;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 12px;
}

.article-content strong {
    color: var(--gray-900);
    font-weight: 600;
}

.article-content a {
    color: var(--primary);
    text-decoration: underline;
    font-weight: 500;
}

.article-content a:hover {
    color: var(--primary-dark);
}

/* Related Articles */
.related-articles {
    max-width: 1200px;
    margin: 80px auto;
    padding: 0 24px;
}

.related-articles h3 {
    font-size: 32px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 32px;
    text-align: center;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

/* Social Share */
.social-share {
    max-width: 800px;
    margin: 48px auto;
    padding: 32px;
    background: var(--gray-50);
    border-radius: 12px;
    text-align: center;
}

.social-share h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
}

.share-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.share-button {
    padding: 10px 20px;
    background: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s;
}

.share-button:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* Article Cards */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-bottom: 48px;
    padding: 60px 0;
}

.article-card-modern {
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    padding: 28px;
    transition: all 0.3s;
    cursor: pointer;
}

.article-card-modern:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
    border-color: var(--primary);
}

.article-category {
    display: inline-block;
    background: var(--gray-100);
    color: var(--gray-600);
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.article-card-modern h3 {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 12px;
}

.article-card-modern h3 a {
    color: var(--dark);
    text-decoration: none;
    transition: color 0.2s;
}

.article-card-modern h3 a:hover {
    color: var(--primary);
}

.article-card-modern p {
    font-size: 14px;
    line-height: 1.6;
    color: var(--gray-600);
    margin-bottom: 16px;
}

.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--gray-200);
    font-size: 13px;
    color: var(--gray-500);
}

/* Footer */
footer {
    background: var(--dark);
    color: var(--gray-400);
    padding: 60px 0 32px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 64px;
    margin-bottom: 48px;
}

.footer-col h4 {
    color: white;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-col p {
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    color: var(--gray-400);
    text-decoration: none;
    font-size: 14px;
    margin-bottom: 12px;
    transition: color 0.2s;
}

.footer-col a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--gray-800);
    font-size: 14px;
}

/* Responsive */
@media (max-width: 968px) {
    .hero-title { font-size: 40px; }
    .article-title { font-size: 36px; }
    .articles-grid { grid-template-columns: 1fr; }
    .related-grid { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr; gap: 32px; }
    .author-box { flex-direction: column; text-align: center; }
}