/* Reset and Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {

    /* ===== COLOR SYSTEM ===== */

    --color-bg: #14161a;
    --color-surface: #1c1f24;
    --color-surface-elevated: #242830;

    --color-text: #f1f3f5;
    --color-text-secondary: #c7c9cc;
    --color-text-muted: #8b8f97;

    --color-border: #2c313a;

    --color-accent: #3b82f6;
    --color-accent-hover: #60a5fa;

    /* ===== TYPOGRAPHY ===== */

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* ===== SPACING ===== */

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;

    /* ===== RADIUS ===== */

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* ===== SHADOWS ===== */

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
    --shadow-md: 0 6px 16px rgba(0,0,0,0.35);
    --shadow-lg: 0 12px 24px rgba(0,0,0,0.4);

    /* ===== LAYOUT ===== */

    --max-width: 1200px;
    --header-height: 88px;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    position: sticky;
    top: 0;
    background-color: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    height: var(--header-height);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 60px;
    width: auto;
    object-fit: contain;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav a {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

.lang-toggle {
    background: none;
    border: 1px solid var(--color-border);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    transition: all 0.2s;
}

.lang-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: 0.3s;
}

/* Hero Section */
.hero {
    position: relative;
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(180deg, #1c1f24 0%, #14161a 100%);
    border-bottom: 1px solid var(--color-border);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0.03;
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-bg-logo {
    max-width: 80%;
    max-height: 80%;
    object-fit: contain;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-tagline {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--color-text);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Categories */
.categories {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--color-border);
}

.section-title {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.categories-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.category-btn {
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    background-color: var(--color-surface);
    color: var(--color-text-secondary);
    font-family: var(--font-primary);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
}

.category-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.category-btn.active {
    background-color: var(--color-accent);
    color: var(--color-bg);
    border-color: var(--color-accent);
}

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

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.sort-controls select {
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background-color: var(--color-surface);
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: 0.875rem;
    cursor: pointer;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.article-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all 0.2s;
    cursor: pointer;
}

.article-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--color-accent);
}

.article-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.article-category-tag {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    font-family: var(--font-mono);
}

.article-date {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

.article-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
    color: var(--color-text);
}

.article-excerpt {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.article-meta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.article-tag {
    font-size: 0.75rem;
    padding: 4px 8px;
    background-color: var(--color-surface-elevated);
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
}

.loading-state {
    text-align: center;
    padding: var(--spacing-xxl);
    color: var(--color-text-muted);
    font-style: italic;
}

.load-more {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* Buttons */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    padding: 12px 24px;
    font-family: var(--font-primary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-bg);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    color: var(--color-bg);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* How It Works */
.how-it-works {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.process-step {
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background-color: var(--color-bg);
}

.step-number {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent);
    opacity: 0.5;
    margin-bottom: var(--spacing-sm);
}

.process-step h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.process-step p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin: 0;
}

/* Clients Preview */
.clients-preview {
    padding: var(--spacing-xxl) 0;
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.client-card {
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background-color: var(--color-surface);
    transition: all 0.2s;
}

.client-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.client-card h3 {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.client-card p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin: 0;
}

.clients-cta {
    text-align: center;
}

/* Footer */
.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
    margin-top: var(--spacing-xxl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xxl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-logo {
    height: 28px;
    width: auto;
    object-fit: contain;
    opacity: 0.9;
}

.footer-brand p {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    margin: 0;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.footer-col h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.footer-col a, .footer-col span {
    display: block;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-xs);
    transition: color 0.2s;
}

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

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin: 0;
}

.footer-meta {
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

/* Page Header */
.page-header {
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.lead {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    max-width: 600px;
}

/* Content Sections */
.content-section {
    padding: var(--spacing-xxl) 0;
}

.two-column {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xxl);
}

.column-main h2 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.column-main h2:first-child {
    margin-top: 0;
}

.column-main h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.feature-list, .numbered-list {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
}

.feature-list li, .numbered-list li {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.feature-list strong {
    color: var(--color-text);
    display: block;
    margin-bottom: 4px;
}

.column-side {
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-lg));
    height: fit-content;
}

.info-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.info-card h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

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

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.stat-value {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--color-accent);
    font-size: 0.875rem;
}

.tech-list {
    list-style: none;
    padding: 0;
}

.tech-list li {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--color-border);
}

.tech-list li:last-child {
    border-bottom: none;
}

/* Pipeline Section */
.pipeline-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

.pipeline-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.pipeline-step {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    min-width: 150px;
}

.step-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.pipeline-step h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.pipeline-step p {
    font-size: 0.875rem;
    margin: 0;
    color: var(--color-text-secondary);
}

.pipeline-arrow {
    font-size: 1.5rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

/* Clients Detail */
.clients-detail {
    padding: var(--spacing-xxl) 0;
}

.client-profile {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.client-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.client-header h2 {
    font-family: var(--font-mono);
    font-size: 1.75rem;
    margin: 0;
    color: var(--color-text);
}

.client-badge {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 6px 12px;
    background-color: var(--color-bg);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.client-content p {
    font-size: 1.0625rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-secondary);
}

.client-services h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.client-services ul {
    list-style: none;
    padding: 0;
}

.client-services li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.client-services li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-family: var(--font-mono);
}

/* CTA Section */
.cta-section {
    padding: var(--spacing-xl) 0 var(--spacing-xxl);
}

.cta-box {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xxl);
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-box h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.cta-box p {
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-secondary);
}

/* Article Page */
.article-full {
    padding: var(--spacing-xl) 0;
}

.article-header {
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    text-align: center;
}

.article-meta-top {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.article-category {
    color: var(--color-accent);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.article-date {
    color: var(--color-text-muted);
}

.article-title {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.article-tags {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.article-content {
    max-width: 760px;
    margin: 0 auto;
    font-size: 1.18rem;
    line-height: 1.9;
}

.article-content h2 {
    font-size: 1.5rem;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.article-content h3 {
    font-size: 1.25rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.article-content p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

.article-content ul, .article-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.article-content li {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-secondary);
}

.article-footer {
    max-width: 720px;
    margin: var(--spacing-xl) auto 0;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.article-source, .article-client {
    margin-bottom: var(--spacing-sm);
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

.article-source a {
    color: var(--color-accent);
    word-break: break-all;
}

.article-signature {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.signature-line {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}

.signature-label {
    color: var(--color-text-muted);
}

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

.article-navigation {
    max-width: 720px;
    margin: var(--spacing-xl) auto 0;
    padding-top: var(--spacing-xl);
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --spacing-xxl: 3rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .two-column {
        grid-template-columns: 1fr;
    }
    
    .column-side {
        position: static;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .pipeline-visual {
        flex-direction: column;
    }
    
    .pipeline-arrow {
        transform: rotate(90deg);
    }
    
    .client-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}