:root {
    --primary: #0f172a;
    --secondary: #334155;
    --accent: #f97316;
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-radius: 12px;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.08);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

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

.header {
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 16px 0;
}

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

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--accent);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.nav {
    display: flex;
    gap: 8px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--accent);
    background: rgba(249,115,22,0.08);
}

.hero {
    background: var(--primary);
    padding: 100px 0;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(249,115,22,0.15) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(99,102,241,0.1) 0%, transparent 40%);
}

.hero h1 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
    position: relative;
}

.hero p {
    font-size: 20px;
    opacity: 0.8;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

.section { padding: 80px 0; }

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.tool-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 28px;
    text-decoration: none;
    color: var(--text-primary);
    border: 1px solid rgba(0,0,0,0.06);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent);
    transform: scaleX(0);
    transition: var(--transition);
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.12);
    border-color: var(--accent);
}

.tool-card:hover::before { transform: scaleX(1); }

.tool-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    color: white;
}

.tool-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

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

.tool-link {
    color: var(--accent);
    font-weight: 600;
    font-size: 14px;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.article-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid rgba(0,0,0,0.06);
    transition: var(--transition);
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.1);
}

.article-image {
    display: block;
    overflow: hidden;
}

.article-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: var(--transition);
}

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

.article-info { padding: 20px; }

.article-category {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(249,115,22,0.1);
    color: var(--accent);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 10px;
}

.article-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

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

.article-meta {
    display: flex;
    gap: 16px;
    margin-top: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}

.page-header {
    background: var(--primary);
    padding: 60px 0;
    text-align: center;
    color: white;
}

.page-header h1 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 8px;
}

.page-header p {
    opacity: 0.7;
}

.card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 32px;
    border: 1px solid rgba(0,0,0,0.06);
}

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

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

.form-input, .form-textarea, .form-select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg-primary);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(249,115,22,0.1);
}

.form-textarea { resize: vertical; min-height: 100px; }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: inherit;
}

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

.btn-primary:hover {
    background: #ea580c;
    transform: translateY(-2px);
}

.footer {
    background: var(--primary);
    color: white;
    padding: 40px 0 20px;
    margin-top: 60px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    text-align: center;
    opacity: 0.6;
    font-size: 14px;
}

.article-content { max-width: 800px; margin: 0 auto; padding: 60px 24px; }
.article-content h2 { font-size: 28px; margin: 40px 0 16px; color: var(--primary); }
.article-content p { font-size: 17px; line-height: 1.8; color: var(--text-secondary); margin-bottom: 20px; }
.article-content .lead { font-size: 20px; color: var(--text-primary); }
.article-tags { display: flex; gap: 8px; margin-top: 40px; flex-wrap: wrap; }
.tag { padding: 6px 14px; background: var(--bg-primary); border-radius: 20px; font-size: 13px; color: var(--text-secondary); }

.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-card { background: var(--bg-secondary); padding: 32px; border-radius: var(--border-radius); border: 1px solid rgba(0,0,0,0.06); }
.stat-number { font-size: 48px; font-weight: 800; color: var(--accent); }
.stat-label { color: var(--text-secondary); margin-top: 8px; }

@media (max-width: 768px) {
    .hero h1 { font-size: 36px; }
    .nav { display: none; }
    .tools-grid, .articles-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

.mobile-menu-btn { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
@media (max-width: 768px) {
    .mobile-menu-btn { display: block; }
    .nav.active { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: white; padding: 16px; box-shadow: 0 4px 20px rgba(0,0,0,0.1); }
}