/* ==================== Blog Shared Styles ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-50: #E8EDF3;
    --primary-100: #D1DBE7;
    --primary-200: #A3B7CF;
    --primary-300: #7593B7;
    --primary-400: #476F9F;
    --primary-500: #1E3A5F;
    --primary-600: #2C4F7C;
    --primary-700: #152B47;
    --primary-800: #0F1F33;
    --primary-900: #0A1420;

    --teal-50: #E5F7F6;
    --teal-100: #CCF0ED;
    --teal-200: #99E1DB;
    --teal-300: #66D2C9;
    --teal-400: #3FB8AF;
    --teal-500: #33C3B7;
    --teal-600: #2E9A92;
    --teal-700: #23766F;
    --teal-800: #18524D;
    --teal-900: #0D2E2A;

    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: #ffffff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== Blog Header ==================== */
.blog-header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 2px solid transparent;
    border-image: linear-gradient(90deg, var(--primary-500), var(--teal-500)) 1;
    z-index: 100;
    padding: 0.75rem 0;
}

.blog-header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.blog-header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.blog-header-left a {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.blog-logo {
    height: 44px;
    width: 44px;
    object-fit: contain;
}

.blog-header-divider {
    width: 1px;
    height: 24px;
    background: var(--gray-300);
}

.blog-header-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-500);
    text-decoration: none;
}

.blog-header-label:hover {
    color: var(--teal-600);
}

.blog-header-nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.blog-header-nav a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-600);
    text-decoration: none;
    transition: color 0.2s ease;
}

.blog-header-nav a:hover {
    color: var(--teal-600);
}

.blog-header-cta {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: linear-gradient(135deg, var(--teal-400), var(--teal-600));
    color: #fff !important;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.85rem;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.blog-header-cta:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* ==================== Blog Index ==================== */
.blog-hero {
    background: linear-gradient(125deg, var(--primary-500) 0%, var(--primary-700) 45%, var(--teal-600) 100%);
    color: #fff;
    padding: 4rem 1.5rem 3.5rem;
    text-align: center;
}

.blog-hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    letter-spacing: -0.025em;
}

.blog-hero p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.85);
    max-width: 540px;
    margin: 0 auto;
}

.blog-index {
    max-width: 960px;
    margin: 0 auto;
    padding: 3rem 1.5rem 4rem;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.blog-card {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: 1rem;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.blog-card-icon {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
}

.blog-card-icon--ifta { background: linear-gradient(135deg, #e0f2fe, #dbeafe); }
.blog-card-icon--tms { background: linear-gradient(135deg, #d1fae5, #ccfbf1); }
.blog-card-icon--settlement { background: linear-gradient(135deg, #fef3c7, #fde68a); }
.blog-card-icon--startup { background: linear-gradient(135deg, #ede9fe, #ddd6fe); }
.blog-card-icon--cpm { background: linear-gradient(135deg, #fce7f3, #fbcfe8); }
.blog-card-icon--invoice { background: linear-gradient(135deg, #ecfdf5, #d1fae5); }
.blog-card-icon--compare { background: linear-gradient(135deg, #fff7ed, #fed7aa); }

.blog-card-body {
    padding: 1.5rem;
}

.blog-card-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--teal-50);
    color: var(--teal-700);
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.blog-card-body h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
    line-height: 1.35;
}

.blog-card-body h2 a {
    color: inherit;
    text-decoration: none;
}

.blog-card-body h2 a:hover {
    color: var(--teal-600);
}

.blog-card-body p {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.blog-card-meta {
    font-size: 0.8rem;
    color: var(--gray-400);
}

/* ==================== Article Layout ==================== */
.article-hero {
    background: linear-gradient(125deg, var(--primary-500) 0%, var(--primary-700) 45%, var(--teal-600) 100%);
    color: #fff;
    padding: 4rem 1.5rem 3rem;
    text-align: center;
}

.article-hero-inner {
    max-width: 720px;
    margin: 0 auto;
}

.article-category {
    display: inline-block;
    padding: 0.35rem 1rem;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 2rem;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.article-hero h1 {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}

.article-meta {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.article-meta-dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
}

/* ==================== Article Content ==================== */
.article-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
}

.article-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin: 2.5rem 0 1rem;
    letter-spacing: -0.01em;
}

.article-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 2rem 0 0.75rem;
}

.article-content p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 1.25rem;
}

.article-content ul,
.article-content ol {
    margin: 1rem 0 1.5rem 1.5rem;
}

.article-content li {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

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

.article-content a {
    color: var(--teal-600);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.article-content a:hover {
    color: var(--teal-700);
}

.article-content blockquote {
    border-left: 4px solid var(--teal-400);
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    background: var(--teal-50);
    border-radius: 0 0.5rem 0.5rem 0;
}

.article-content blockquote p {
    margin-bottom: 0;
    color: var(--gray-700);
    font-style: italic;
}

/* Callout / tip boxes */
.callout {
    margin: 1.5rem 0;
    padding: 1.25rem 1.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--gray-200);
}

.callout--tip {
    background: var(--teal-50);
    border-color: var(--teal-200);
}

.callout--warning {
    background: #fef3c7;
    border-color: #fde68a;
}

.callout--info {
    background: #eff6ff;
    border-color: #bfdbfe;
}

.callout-title {
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}

.callout p {
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* Formula / code blocks */
.formula-block {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 0.75rem;
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--primary-700);
    overflow-x: auto;
}

/* Comparison table in articles */
.article-table-wrap {
    overflow-x: auto;
    margin: 1.5rem 0;
    border-radius: 0.75rem;
    border: 1px solid var(--gray-200);
}

.article-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.article-table th {
    background: var(--primary-500);
    color: #fff;
    padding: 0.75rem 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
}

.article-table th:first-child {
    border-radius: 0.75rem 0 0 0;
}

.article-table th:last-child {
    border-radius: 0 0.75rem 0 0;
}

.article-table td {
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--gray-100);
    color: var(--gray-700);
}

.article-table tbody tr:hover {
    background: var(--gray-50);
}

.article-table .highlight-col {
    background: #f0fdfa;
    font-weight: 600;
    color: var(--teal-700);
}

/* ==================== Mid-article CTA ==================== */
.mid-cta {
    margin: 2.5rem 0;
    padding: 2rem;
    background: linear-gradient(135deg, var(--primary-50), var(--teal-50));
    border: 1px solid var(--teal-200);
    border-radius: 1rem;
    text-align: center;
}

.mid-cta h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-700);
    margin-bottom: 0.5rem;
}

.mid-cta p {
    font-size: 0.95rem;
    color: var(--gray-600);
    margin-bottom: 1.25rem;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.mid-cta .btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: linear-gradient(135deg, var(--teal-400), var(--teal-600));
    color: #fff;
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.mid-cta .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ==================== Footer CTA ==================== */
.blog-footer-cta {
    background: linear-gradient(115deg, var(--primary-700) 0%, var(--primary-500) 35%, var(--teal-600) 100%);
    color: #fff;
    text-align: center;
    padding: 4rem 1.5rem;
}

.blog-footer-cta h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.blog-footer-cta p {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.85);
    max-width: 520px;
    margin: 0 auto 2rem;
}

.blog-footer-cta .btn-primary {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: #fff;
    color: var(--primary-500);
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 700;
    font-size: 1.05rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-right: 0.75rem;
}

.blog-footer-cta .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.blog-footer-cta .btn-secondary {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 1.05rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    transition: background 0.2s ease;
}

.blog-footer-cta .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ==================== Blog Footer ==================== */
.blog-footer {
    background: var(--gray-900);
    color: var(--gray-400);
    text-align: center;
    padding: 2rem 1.5rem;
    font-size: 0.9rem;
}

.blog-footer a {
    color: var(--teal-400);
    text-decoration: none;
}

.blog-footer a:hover {
    color: var(--teal-300);
}

/* ==================== Breadcrumbs ==================== */
.breadcrumbs {
    max-width: 720px;
    margin: 0 auto;
    padding: 1rem 1.5rem 0;
    font-size: 0.85rem;
    color: var(--gray-400);
}

.breadcrumbs a {
    color: var(--gray-500);
    text-decoration: none;
}

.breadcrumbs a:hover {
    color: var(--teal-600);
}

.breadcrumbs span {
    margin: 0 0.35rem;
}

/* ==================== Table of Contents ==================== */
.toc {
    margin: 0 0 2rem;
    padding: 1.25rem 1.5rem;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 0.75rem;
}

.toc-title {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--gray-900);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.75rem;
}

.toc ol {
    margin: 0;
    padding-left: 1.25rem;
}

.toc li {
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 0.35rem;
    color: var(--gray-600);
}

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

.toc a:hover {
    color: var(--teal-600);
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
    .blog-hero h1 {
        font-size: 1.75rem;
    }

    .article-hero h1 {
        font-size: 1.75rem;
    }

    .article-content h2 {
        font-size: 1.3rem;
    }

    .article-content p,
    .article-content li {
        font-size: 1rem;
    }

    .blog-grid {
        grid-template-columns: 1fr;
    }

    .blog-header-nav {
        display: none;
    }

    .blog-footer-cta h2 {
        font-size: 1.5rem;
    }

    .blog-footer-cta .btn-primary,
    .blog-footer-cta .btn-secondary {
        display: block;
        margin: 0 auto 0.75rem;
        max-width: 300px;
    }

    .article-meta {
        flex-direction: column;
        gap: 0.25rem;
    }

    .article-meta-dot {
        display: none;
    }
}

@media (max-width: 480px) {
    .blog-hero {
        padding: 3rem 1rem 2.5rem;
    }

    .article-hero {
        padding: 3rem 1rem 2.5rem;
    }

    .article-container {
        padding: 2rem 1rem 3rem;
    }

    .blog-header-inner {
        padding: 0 1rem;
    }
}