.main-container {
    display:flex;
    gap:20px;
    margin-bottom:40px;
}

.sidebar-left {
    width:250px;
    flex-shrink:0;
}

.main-content {
    flex:1;
    background-color:white;
    border-radius:8px;
    box-shadow:0 3px 10px rgba(0, 0, 0, 0.08);
    overflow:hidden;
}

.sidebar-widget {
    background-color:white;
    border-radius:8px;
    padding:20px;
    margin-bottom:20px;
    box-shadow:0 2px 10px rgba(0, 0, 0, 0.05);
}

.sidebar-widget h3 {
    font-size:16px;
    color:#1a365d;
    margin-bottom:15px;
    padding-bottom:10px;
    border-bottom:1px solid #e2e8f0;
}

.category-list {
    list-style:none;
}

.category-list li {
    margin-bottom:10px;
}

.category-list a {
    color:#475569;
    text-decoration:none;
    padding:8px 0;
    display:block;
    transition:color 0.3s;
}

.category-list a:hover {
    color:#0ea5e9;
    padding-left:10px;
}

.content-header {
    background:linear-gradient(135deg, #1a365d 0%, #2d4a7c 100%);
    color:white;
    padding:30px;
}

.content-header h1 {
    font-size:28px;
    margin-bottom:10px;
}

.content-header p {
    opacity:0.9;
    margin-bottom:20px;
}

.content-body {
    padding:30px;
}

.project-intro {
    background:#f0f9ff;
    padding:40px;
    border-bottom:1px solid #e0f2fe;
}

.project-intro h2 {
    font-size:24px;
    color:#0369a1;
    margin-bottom:20px;
    text-align:center;
}

.project-intro p {
    font-size:16px;
    line-height:1.8;
    color:#475569;
    margin-bottom:15px;
    text-align:justify;
}

.project-highlights {
    display:grid;
    grid-template-columns:repeat(4, 1fr);
    gap:20px;
    margin-top:30px;
}

.highlight-card {
    background:white;
    padding:20px;
    border-radius:8px;
    text-align:center;
    box-shadow:0 2px 8px rgba(0, 0, 0, 0.05);
}

.highlight-icon {
    font-size:40px;
    margin-bottom:15px;
    color:#0ea5e9;
}

.highlight-title {
    font-size:18px;
    color:#1a365d;
    margin-bottom:10px;
    font-weight:600;
}

.highlight-desc {
    font-size:14px;
    color:#64748b;
    line-height:1.5;
}

.contact-content {
    padding:40px;
}

.contact-grid {
    display:grid;
    grid-template-columns:1fr;
    gap:40px;
    max-width:800px;
    margin:0 auto;
}

.contact-info-2 {
    background:#f8fafc;
    border-radius:8px;
    padding:30px;
}

.contact-info-2 h2 {
    font-size:24px;
    color:#1a365d;
    margin-bottom:20px;
    padding-bottom:10px;
    border-bottom:2px solid #0ea5e9;
}

.info-item {
    display:flex;
    margin-bottom:25px;
}

.info-icon {
    width:50px;
    height:50px;
    background:#0ea5e9;
    border-radius:50%;
    display:flex;
    align-items:center;
    justify-content:center;
    margin-right:15px;
    flex-shrink:0;
    color:white;
    font-size:20px;
}

.info-content h3 {
    font-size:18px;
    color:#1a365d;
    margin-bottom:5px;
}

.info-content p {
    color:#64748b;
}

.qrcode-container {
    margin-top:10px;
    text-align:center;
}

.qrcode-placeholder {
    width:120px;
    height:120px;
    background:#e2e8f0;
    display:flex;
    align-items:center;
    justify-content:center;
    color:#64748b;
    border:1px dashed #cbd5e1;
    border-radius:8px;
    margin:10px auto;
}

.qrcode-note {
    font-size:12px;
    color:#94a3b8;
    margin-top:5px;
}

.cooperation-types {
    margin-top:40px;
}

.cooperation-types h2 {
    font-size:24px;
    color:#1a365d;
    margin-bottom:20px;
    text-align:center;
}

.types-grid {
    display:grid;
    grid-template-columns:repeat(auto-fit, minmax(250px, 1fr));
    gap:20px;
}

.type-card {
    background:#f8fafc;
    border-radius:8px;
    padding:25px;
    border:1px solid #e2e8f0;
    transition:all 0.3s;
    text-align:center;
}

.type-card:hover {
    border-color:#0ea5e9;
    box-shadow:0 2px 8px rgba(0, 0, 0, 0.05);
}

.type-icon {
    font-size:40px;
    margin-bottom:15px;
    color:#0ea5e9;
}

.type-title {
    font-size:18px;
    color:#1a365d;
    margin-bottom:10px;
    font-weight:600;
}

.type-desc {
    color:#64748b;
    font-size:14px;
    line-height:1.5;
}

.contact-message {
    background:#f0f9ff;
    border-radius:8px;
    padding:30px;
    margin:30px 0;
    text-align:center;
}

.contact-message h3 {
    color:#0369a1;
    margin-bottom:15px;
    font-size:20px;
}

.contact-message p {
    color:#475569;
    font-size:16px;
    line-height:1.6;
    margin-bottom:20px;
}

.contact-btn {
    background:#0ea5e9;
    color:white;
    padding:12px 24px;
    border:none;
    border-radius:4px;
    text-decoration:none;
    font-size:16px;
    font-weight:500;
    display:inline-block;
    transition:background 0.3s;
}

.contact-btn:hover {
    background:#0284c7;
}

@media (max-width:768px) {

    .main-container {
        flex-direction:column;
    }

    .sidebar-left {
        width:100%;
    }

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

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

    .info-item {
        flex-direction:column;
        align-items:center;
        text-align:center;
    }

    .info-icon {
        margin-right:0;
        margin-bottom:10px;
    }

    .project-highlights {
        grid-template-columns:1fr;
    }
}