:root {
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    --bg-card: #1a2035;
    --bg-card-hover: #1f2a42;
    --color-accent: #00b4d8;
    --color-accent-dark: #0096b7;
    --color-accent-glow: rgba(0, 180, 216, 0.15);
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-text-heading: #f1f5f9;
    --color-border: #1e293b;
    --color-success: #10b981;
    --color-danger: #ef4444;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --transition: 0.25s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

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

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

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

.text-muted { color: var(--color-text-muted); }
.articles-empty { text-align: center; grid-column: 1 / -1; }

/* ====== NAVBAR ====== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 15, 26, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--transition);
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-heading);
}

.navbar-brand span {
    color: var(--color-accent);
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.navbar-menu a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: color var(--transition);
}

.navbar-menu a:hover {
    color: var(--color-text-heading);
}

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ====== HERO ====== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 64px;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--color-accent-glow);
    border: 1px solid rgba(0, 180, 216, 0.3);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--color-accent);
    margin-bottom: 24px;
    letter-spacing: 0.03em;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.15;
    color: var(--color-text-heading);
    margin-bottom: 20px;
}

.hero h1 em {
    font-style: normal;
    color: var(--color-accent);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    margin-bottom: 36px;
    max-width: 560px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* ====== BUTTONS ====== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--color-accent-dark);
    color: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 180, 216, 0.3);
}

.btn-full {
    width: 100%;
    justify-content: center;
    height: 45px;
}

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

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

/* ====== SECTIONS ====== */

.section {
    padding: 100px 0;
}

.section--alt {
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: 16px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ====== PROBLEMS ====== */

.problems-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.problem-card {
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
}

.problem-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(0, 180, 216, 0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.problem-icon {
    width: 48px;
    height: 48px;
    background: var(--color-accent-glow);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--color-accent);
}

.service-card h3 svg {
    vertical-align: -3px;
    color: var(--color-accent);
}

.problem-card h3 {
    font-size: 1.15rem;
    color: var(--color-text-heading);
    margin-bottom: 12px;
}

.problem-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ====== SERVICES ====== */

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: all var(--transition);
}

.service-card:hover {
    border-color: rgba(0, 180, 216, 0.2);
}

.service-card h3 {
    font-size: 1.2rem;
    color: var(--color-text-heading);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.service-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

.service-card ul {
    list-style: none;
    margin-top: 16px;
}

.service-card ul li {
    padding: 6px 0;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.service-card ul li::before {
    content: '—';
    color: var(--color-accent);
    flex-shrink: 0;
}

/* ====== RESULTS ====== */

.results-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.result-card {
    text-align: center;
    padding: 32px 16px;
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.result-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: 8px;
}

.result-label {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* ====== ARTICLES ====== */

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.article-card {
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
    cursor: pointer;
    text-decoration: none;
    display: block;
}

.article-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(0, 180, 216, 0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.article-card-image {
    aspect-ratio: 1200 / 630;
    overflow: hidden;
}

.article-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

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

.article-card-body {
    padding: 20px 24px 24px;
}

.article-date {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 12px;
    font-family: var(--font-mono);
}

.article-card h3 {
    font-size: 1.05rem;
    color: var(--color-text-heading);
    margin-bottom: 10px;
    line-height: 1.4;
}

.article-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.articles-more {
    text-align: center;
    margin-top: 40px;
}

/* ====== CONTACT ====== */

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.contact-info h3 {
    font-size: 1.4rem;
    color: var(--color-text-heading);
    margin-bottom: 16px;
}

.contact-info p {
    color: var(--color-text-muted);
    margin-bottom: 24px;
    line-height: 1.7;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: border-color var(--transition);
}

.contact-method:hover {
    border-color: var(--color-accent);
}

.contact-method-icon {
    width: 40px;
    height: 40px;
    background: var(--color-accent-glow);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 6px;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    font-family: var(--font-main);
    font-size: 0.95rem;
    transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-message {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 0.9rem;
    display: none;
}

.form-message.success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--color-success);
    display: block;
}

.form-message.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--color-danger);
    display: block;
}

/* ====== FOOTER ====== */

.footer {
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
    background: var(--bg-secondary);
}

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

.footer-copy {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

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

/* ====== ARTICLE PAGE ====== */

.article-page {
    padding-top: 100px;
    padding-bottom: 60px;
    min-height: 80vh;
}

.breadcrumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 0.9rem; color: var(--color-text-muted); margin-bottom: 32px; }
.breadcrumbs a { color: var(--color-text-muted); }
.breadcrumbs a:hover { color: var(--color-accent); }
.breadcrumbs-sep { opacity: 0.5; }
.breadcrumbs > span:last-child { color: var(--color-text); }
.related-articles { margin-top: 60px; padding-top: 40px; border-top: 1px solid var(--color-border); }
.related-articles h2 { font-size: 1.4rem; color: var(--color-text-heading); margin-bottom: 24px; }
.related-articles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 768px) { .related-articles-grid { grid-template-columns: 1fr; } }

.article-page h1 {
    font-size: 2.2rem;
    color: var(--color-text-heading);
    margin-bottom: 16px;
    line-height: 1.3;
}

.article-meta {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    font-family: var(--font-mono);
    margin-bottom: 40px;
}

.article-content {
    max-width: none;
    font-size: 1.05rem;
    line-height: 1.8;
}

.article-content h2 {
    font-size: 1.5rem;
    color: var(--color-text-heading);
    margin-top: 40px;
    margin-bottom: 16px;
}

.article-content h3 {
    font-size: 1.2rem;
    color: var(--color-text-heading);
    margin-top: 32px;
    margin-bottom: 12px;
}

.article-content p {
    margin-bottom: 16px;
}

.article-content code {
    font-family: var(--font-mono);
    background: var(--bg-card);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.9em;
}

.article-content pre {
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px;
    overflow-x: auto;
    margin-bottom: 20px;
}

.article-content pre code {
    background: none;
    padding: 0;
}

.article-content ul, .article-content ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.article-content li {
    margin-bottom: 8px;
}

.article-content img {
    max-width: 100%;
    border-radius: var(--radius);
    margin: 20px 0;
}

/* ====== ARTICLES LIST PAGE ====== */

.articles-page {
    padding-top: 100px;
    padding-bottom: 60px;
    min-height: 80vh;
}

.articles-page h1 {
    font-size: 2rem;
    color: var(--color-text-heading);
    margin-bottom: 8px;
}

.articles-page .section-subtitle {
    color: var(--color-text-muted);
    margin-bottom: 40px;
}

.search-box {
    position: relative;
    max-width: 400px;
    margin-bottom: 40px;
}

.search-box input {
    width: 100%;
    padding: 12px 16px 12px 44px;
    background: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    font-size: 0.95rem;
}

.search-box input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.search-box svg {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
}

/* ====== RESPONSIVE ====== */

@media (max-width: 1024px) {
    .problems-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .navbar-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 20px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--color-border);
    }

    .navbar-menu.active {
        display: flex;
    }

    .navbar-toggle {
        display: block;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

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

    .results-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .section {
        padding: 60px 0;
    }

    .section-header h2 {
        font-size: 1.7rem;
    }

    .footer .container {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .article-page h1 {
        font-size: 1.6rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem;
    }

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

    .btn {
        justify-content: center;
    }

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