:root {
    --color-primary: #1a1a1a;
    --color-secondary: #4a4a4a;
    --color-accent: #0891b2;
    --color-accent-light: #06b6d4;
    --color-bg: #ffffff;
    --color-bg-alt: #f7f6f4;
    --color-border: #e8e4de;
    --color-text: #1e293b;
    --color-text-light: #64748b;

    /* Category colors */
    --color-implementation: #0891b2;    /* Teal */
    --color-measurement: #7c3aed;       /* Purple */
    --color-strategy: #0f766e;          /* Dark teal/green */
    --color-cases: #b45309;             /* Amber/brown */

    --font-display: 'Cormorant Garamond', serif;
    --font-body: 'Work Sans', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Navigation */
.nav {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    animation: slideDown 0.6s ease-out;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--color-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    position: relative;
    transition: var(--transition);
    letter-spacing: 0.01em;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: width 0.3s ease;
}

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

.nav-links a:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #ede9fe 0%, #cffafe 50%, #fef9c3 100%);
    border-bottom: 1px solid #d4c9f5;
}

.hero-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) 2rem;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-content {
    max-width: 900px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.6rem, 5.5vw, 5rem);
    font-weight: 400;
    line-height: 1.05;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 300;
    font-style: italic;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.01em;
}

.hero-description {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-lg);
    font-weight: 300;
    max-width: 680px;
}

.hero-meta {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.hero-image {
    width: 120px;
    height: 120px;
    border-radius: 8px;
    object-fit: cover;
    flex-shrink: 0;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
}

.hero-name {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: 0.15rem;
}

.hero-role {
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-bottom: 0.1rem;
}

.hero-connect {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-top: 0.5rem;
    line-height: 1.5;
}

.hero-connect a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    white-space: nowrap;
}

.hero-connect a:hover {
    text-decoration: underline;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Section Titles */
.section-title {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 400;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

/* Featured Articles */
.featured-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg);
}

.featured-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    grid-template-rows: auto auto;
    gap: 2rem;
    margin-bottom: var(--spacing-lg);
    align-items: start;
}

.featured-grid .article-card:first-child {
    grid-row: 1 / 3;
}

.featured-grid .article-card:first-child .article-image {
    height: 360px;
}

.article-card {
    background: white;
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-accent);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
    animation: fadeInUp 0.6s ease-out both;
}

/* Category border colors */
.article-card[data-category="implementation"] {
    border-left-color: var(--color-implementation);
}

.article-card[data-category="measurement-strategy"] {
    border-left-color: var(--color-measurement);
}

.article-card[data-category="strategy-culture"] {
    border-left-color: var(--color-strategy);
}

.article-card[data-category="case-studies"] {
    border-left-color: var(--color-cases);
}

.article-card:nth-child(1) { animation-delay: 0.1s; }
.article-card:nth-child(2) { animation-delay: 0.2s; }
.article-card:nth-child(3) { animation-delay: 0.3s; }

.article-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.article-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform 0.4s ease;
    display: block;
}

.article-card:hover .article-image {
    transform: scale(1.03);
}

.article-content {
    padding: 1.75rem;
}

.article-category {
    display: inline-block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

/* Category label colors */
.article-card[data-category="implementation"] .article-category {
    color: var(--color-implementation);
}

.article-card[data-category="measurement-strategy"] .article-category {
    color: var(--color-measurement);
}

.article-card[data-category="strategy-culture"] .article-category {
    color: var(--color-strategy);
}

.article-card[data-category="case-studies"] .article-category {
    color: var(--color-cases);
}

.article-title {
    font-family: var(--font-display);
    font-size: 1.65rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    line-height: 1.25;
}

.article-preview {
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 1.25rem;
    font-size: 0.95rem;
}

/* Lead Article Card (Magazine Style) */
.article-card-lead {
    display: block;
}

.article-card-lead .article-content {
    display: block;
}

.article-title-lead {
    font-size: 2.2rem;
    line-height: 1.15;
    margin-bottom: 1rem;
    flex-shrink: 0;
}

.article-excerpt-wrap {
    position: relative;
    overflow: hidden;
    max-height: 14rem;
    margin-bottom: 0.75rem;
}

.article-excerpt-wrap::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4rem;
    background: linear-gradient(to bottom, transparent, white);
    pointer-events: none;
}

.article-excerpt p {
    color: var(--color-text-light);
    line-height: 1.8;
    font-size: 0.95rem;
    margin: 0 0 0.85rem;
}

.article-excerpt p:last-child {
    margin-bottom: 0;
}

.article-read-more {
    display: inline-block;
    color: var(--color-accent);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    margin-bottom: 0.75rem;
    transition: letter-spacing 0.2s ease;
}

.article-card:hover .article-read-more {
    letter-spacing: 0.06em;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--color-text-light);
    border-top: 1px solid var(--color-border);
    padding-top: 1rem;
    margin-top: 0.25rem;
}

.article-date::before {
    content: '•';
    margin-right: 0.5rem;
}

/* Articles Section */
.articles-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-bg-alt);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: 1.5rem;
}

.section-header .section-title {
    margin-bottom: 0;
}

.filter-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-tag {
    padding: 0.4rem 1rem;
    background: white;
    border: 1px solid var(--color-border);
    color: var(--color-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-body);
    font-weight: 400;
    border-radius: 2px;
}

.filter-tag:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.filter-tag.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
}

/* Footer */
.footer {
    background: var(--color-primary);
    color: var(--color-bg);
    padding: var(--spacing-md) 0;
    margin-top: var(--spacing-xl);
}

.footer-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.footer-brand {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: rgba(255,255,255,0.9);
    font-weight: 400;
    letter-spacing: -0.01em;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.footer-links a {
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: rgba(255,255,255,0.95);
}

.footer p {
    color: rgba(255,255,255,0.5);
    font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 900px) {
    .featured-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }

    .featured-grid .article-card:first-child {
        grid-row: auto;
    }

    .featured-grid .article-card:first-child .article-image {
        height: 220px;
    }
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.75rem;
    }

    .hero-title {
        font-size: clamp(2rem, 7vw, 2.6rem);
    }

    .hero-description {
        font-size: 1.1rem;
    }

    .hero-meta {
        flex-direction: column;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

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

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }
}

/* Article Page Styles */
.article-header {
    background: linear-gradient(135deg, #ede9fe 0%, #cffafe 50%, #fef9c3 100%);
    border-bottom: 1px solid #d4c9f5;
}

.article-header-inner {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg) 2rem var(--spacing-md);
}

.article-breadcrumb {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.article-breadcrumb a {
    color: var(--color-accent);
    text-decoration: none;
}

.article-breadcrumb a:hover {
    text-decoration: underline;
}

.article-page-title {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 4vw, 3.5rem);
    font-weight: 400;
    line-height: 1.1;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.03em;
}

.article-page-meta {
    display: flex;
    gap: 1.25rem;
    color: var(--color-text-light);
    font-size: 0.85rem;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
    flex-wrap: wrap;
}

.article-hero-image {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    display: block;
}

.article-hero-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    display: block;
}

.article-body {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg) 2rem var(--spacing-xl);
    font-size: 1.1rem;
    line-height: 1.85;
    color: var(--color-text);
}

.article-body h1 {
    display: none;
}

.article-body h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 500;
    margin: 3rem 0 1.25rem;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.article-body h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    margin: 2rem 0 0.75rem;
    color: var(--color-primary);
}

.article-body p {
    margin-bottom: 1.5rem;
}

.article-body ul,
.article-body ol {
    margin: 1.5rem 0;
    padding-left: 1.75rem;
}

.article-body li {
    margin-bottom: 0.6rem;
}

.article-body strong {
    color: var(--color-primary);
    font-weight: 600;
}

.article-body code {
    background: var(--color-bg-alt);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-size: 0.9em;
    font-family: 'Monaco', 'Courier New', monospace;
}

.article-body pre {
    background: var(--color-primary);
    color: var(--color-bg);
    padding: 1.5rem;
    border-radius: 4px;
    overflow-x: auto;
    margin: 2rem 0;
}

.article-body pre code {
    background: none;
    padding: 0;
    color: var(--color-bg);
}

.article-body blockquote {
    border-left: 3px solid var(--color-accent);
    padding: 1rem 1.5rem;
    margin: 2.5rem 0;
    background: var(--color-bg-alt);
    font-size: 1.15rem;
    font-style: italic;
    color: var(--color-secondary);
    line-height: 1.7;
}

.article-body hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 3rem 0;
}

.article-body img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 2rem auto;
}

.article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    font-size: 0.92rem;
}

.article-body th {
    background: var(--color-primary);
    color: var(--color-bg);
    text-align: left;
    padding: 0.75rem 1rem;
    font-family: var(--font-body);
    font-weight: 600;
    letter-spacing: 0.02em;
}

.article-body td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--color-border);
    vertical-align: top;
    line-height: 1.6;
}

.article-body tr:nth-child(even) td {
    background: var(--color-bg-alt);
}

/* Category Navigation (side-scrolling) */
.category-nav {
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.category-nav::-webkit-scrollbar {
    display: none;
}

.category-nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: inline-flex;
    gap: 2rem;
}

.category-nav-item {
    padding: 1.25rem 0;
    color: var(--color-text-light);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
    position: relative;
}

.category-nav-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width 0.3s ease;
}

.category-nav-item:hover,
.category-nav-item.active {
    color: var(--color-primary);
}

.category-nav-item.active::after {
    width: 100%;
}