:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary: #10b981;
    --accent: #f59e0b;
    --danger: #ef4444;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #1e293b;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.16);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
}

a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }

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

/* Header */
.header {
    background: white;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 16px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 22px;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.logo-icon i { width: 24px; height: 24px; }

.nav {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 600;
    padding: 8px 0;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--text-primary);
}

/* Hero */
.hero {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    padding: 100px 0;
    color: white;
    text-align: center;
}

.hero h1 {
    font-size: clamp(36px, 6vw, 56px);
    margin-bottom: 20px;
}

.hero p {
    font-size: 20px;
    opacity: 0.85;
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-badge {
    display: inline-block;
    background: rgba(37, 99, 235, 0.2);
    color: #60a5fa;
    padding: 8px 20px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background: var(--primary);
    color: white;
}

.btn-success {
    background: var(--secondary);
    color: white;
}

/* Sections */
.section { padding: 80px 0; }
.section h2 { font-size: 36px; margin-bottom: 16px; text-align: center; }

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.tool-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border);
    display: block;
    color: var(--text-primary);
    position: relative;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.tool-icon {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    transition: var(--transition);
}

.tool-icon i { width: 32px; height: 32px; color: white; }

.tool-card:hover .tool-icon {
    transform: scale(1.1) rotate(5deg);
}

.tool-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.tool-card p {
    color: var(--text-secondary);
    font-size: 14px;
}

.tool-tag {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--secondary);
    color: white;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.article-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border);
}

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

.article-image {
    display: block;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.article-card:hover .article-image img {
    transform: scale(1.05);
}

.article-info { padding: 24px; }

.article-category {
    display: inline-block;
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.article-info h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.article-info h3 a { color: var(--text-primary); }
.article-info h3 a:hover { color: var(--primary); }

.article-info p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
}

.article-meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--text-light);
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.article-meta i { width: 14px; height: 14px; }

/* Footer */
.footer {
    background: var(--bg-tertiary);
    color: white;
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-links h4 {
    font-size: 16px;
    margin-bottom: 20px;
}

.footer-links a {
    display: block;
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    margin-bottom: 12px;
}

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

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 14px;
    opacity: 0.7;
}

/* Page Headers */
.page-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    padding: 80px 0;
    text-align: center;
    color: white;
}

.page-header h1 { font-size: 48px; margin-bottom: 16px; }
.page-header p { font-size: 18px; opacity: 0.9; }

/* Card */
.card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
}

/* Form Elements */
.form-group { margin-bottom: 20px; }
.form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-input, .form-textarea, .form-select {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition);
    background: white;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

/* Related Articles */
.related-articles {
    background: var(--bg-secondary);
    padding: 80px 0;
}

/* Article Content */
.article-content { padding: 60px 0; }
.article-content .container { max-width: 800px; }
.article-content .lead {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.8;
}

.article-content h2 {
    font-size: 32px;
    margin: 48px 0 24px;
}

.article-content h3 {
    font-size: 24px;
    margin: 32px 0 16px;
    font-weight: 600;
}

.article-content p { margin-bottom: 20px; line-height: 1.8; }
.article-content blockquote {
    border-left: 4px solid var(--primary);
    padding-left: 24px;
    margin: 32px 0;
    font-style: italic;
    color: var(--text-secondary);
    font-size: 18px;
}

.article-content img {
    width: 100%;
    border-radius: var(--radius-lg);
    margin: 32px 0;
}

.article-tags {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.tag {
    background: var(--bg-secondary);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
}

/* About Page */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.about-image img { width: 100%; display: block; }

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 32px;
}

.skill-item {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: var(--radius-md);
    text-align: center;
}

.skill-item i {
    width: 32px;
    height: 32px;
    color: var(--primary);
    margin-bottom: 12px;
}

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: rgba(37, 99, 235, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon i { color: var(--primary); width: 24px; height: 24px; }

/* Job Card */
.job-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

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

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    text-align: center;
}

.stat-item {
    padding: 32px;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--accent);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .mobile-menu-btn { display: block; }
    
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        border-top: 1px solid var(--border);
    }
    
    .nav.mobile-open { display: flex; }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
        text-align: center;
    }
    
    .hero h1 { font-size: 36px; }
    
    .section { padding: 60px 0; }
    
    .tools-grid, .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
}