* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
}
:root {
    --primary: #2563eb;
    --primary-light: #38bdf8;
    --dark: #0f172a;
    --gray: #475569;
    --light-gray: #f1f5f9;
    --text-light: #94a3b8;
}
body {
    background-color: #f8fafc;
    color: var(--dark);
    line-height: 1.7;
}
header {
    background: var(--dark);
    color: white;
    padding: 0 40px;
    position: sticky;
    top: 0;
    z-index: 99;
}
.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-light);
    text-decoration: none;
}
.nav-links a {
    color: #cbd5e1;
    text-decoration: none;
    margin-left: 28px;
    transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-light);
}
.search-top {
    display: flex;
    align-items: center;
}
.search-top input {
    padding: 7px 12px;
    border-radius: 6px 0 0 6px;
    border: none;
    outline: none;
    width: 220px;
}
.search-top button {
    padding: 7px 14px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0 6px 6px 0;
    cursor: pointer;
}
.wrap {
    max-width: 1400px;
    margin: 30px auto;
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 30px;
    padding: 0 20px;
}
.sidebar {
    background: white;
    border-radius: 10px;
    padding: 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    height: fit-content;
    position: sticky;
    top: 90px;
}
.sidebar h3 {
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e2e8f0;
}
.sidebar ul {
    list-style: none;
}
.sidebar li a {
    display: block;
    padding: 8px 0;
    color: var(--gray);
    text-decoration: none;
    transition: 0.2s;
}
.sidebar li a:hover {
    color: var(--primary);
    padding-left: 6px;
}
.banner {
    background: linear-gradient(135deg, #1e40af, #0369a1);
    color: white;
    border-radius: 12px;
    padding: 50px 40px;
    margin-bottom: 30px;
}
.banner h1 {
    font-size: 38px;
    margin-bottom: 14px;
}
.banner p {
    font-size: 18px;
    opacity: 0.9;
    max-width: 750px;
}
.section-title {
    font-size: 26px;
    margin: 40px 0 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--light-gray);
}
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.ai-card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    padding: 24px;
    transition: transform 0.2s;
}
.ai-card:hover {
    transform: translateY(-5px);
}
.ai-card h4 {
    font-size: 20px;
    color: var(--primary);
    margin-bottom: 12px;
}
.ai-card p {
    color: var(--gray);
    font-size: 15px;
}
.read-more {
    display: inline-block;
    margin-top: 14px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}
.wiki-block {
    background: white;
    border-radius: 10px;
    padding: 32px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.wiki-block h2 {
    margin-bottom: 18px;
    font-size: 28px;
}
.wiki-block h3 {
    margin: 24px 0 12px;
}
.wiki-block p {
    margin-bottom: 16px;
    color: #334155;
}
footer {
    margin-top: 60px;
    background: var(--dark);
    color: var(--text-light);
    text-align: center;
    padding: 35px 20px;
}
@media (max-width: 900px) {
    .wrap {
        grid-template-columns: 1fr;
    }
    .sidebar {
        position: static;
    }
    .nav-container {
        flex-wrap: wrap;
        height: auto;
        padding: 15px 20px;
        gap:15px;
    }
    .nav-links {
        display: flex;
        flex-wrap: wrap;
    }
    .banner h1 {
        font-size: 28px;
    }
}