/* ===== 内页横幅 ===== */
.page-banner { background: linear-gradient(135deg, #0b1a33 0%, #1a3a7a 50%, #2563eb 100%); color: #fff; padding: 60px 0 50px; position: relative; overflow: hidden; }
.page-banner::after { content: ''; position: absolute; right: -100px; top: -100px; width: 400px; height: 400px; background: rgba(255,255,255,0.04); border-radius: 50%; }
.page-banner .container { position: relative; z-index: 2; }
.page-banner h1 { font-size: 40px; font-weight: 700; margin-bottom: 10px; }
.page-banner p { font-size: 18px; opacity: 0.85; max-width: 800px; }
.page-banner .breadcrumb { margin-top: 16px; font-size: 14px; opacity: 0.7; }
.page-banner .breadcrumb a { color: #fff; opacity: 0.7; }
.page-banner .breadcrumb a:hover { opacity: 1; }
.page-banner .breadcrumb span { margin: 0 6px; }
/* ===== 案例列表 ===== */
.case {padding: 80px 0;background: #fff;}
.case-list { padding: 50px 0 80px; background: #f8fafc; }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.case-card { background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 2px 12px rgba(0,0,0,0.06); transition: transform 0.3s, box-shadow 0.3s; display: flex; flex-direction: column; }
.case-card:hover { transform: translateY(-8px); box-shadow: 0 12px 40px rgba(0,0,0,0.10); }
.case-card img { width: 100%; height: 220px; object-fit: cover; }
.case-card .case-body { padding: 20px 24px 24px; flex: 1; display: flex; flex-direction: column; }
.case-card .case-tag { display: inline-block; background: #e8edf9; color: #2563eb; font-size: 12px; font-weight: 600; padding: 2px 12px; border-radius: 20px; align-self: flex-start; margin-bottom: 10px; }
.case-card h5 { font-size: 20px; color: #222; margin-bottom: 6px; font-weight: 700; }
.case-card .case-sub { font-size: 14px; color: #888; margin-bottom: 10px; }
.case-card .case-desc { font-size: 15px; color: #555; line-height: 1.7; flex: 1; }
.case-card .case-link { margin-top: 16px; font-size: 14px; font-weight: 500; color: #2563eb; display: inline-flex; align-items: center; gap: 4px; transition: gap 0.3s; }
.case-card .case-link:hover { gap: 10px; }
.case-card .case-link::after { content: '\2192'; transition: transform 0.3s; }
.case-card .case-link:hover::after { transform: translateX(4px); }
/* ===== 响应式 ===== */
@media screen and (max-width: 992px) {
    .case-grid { grid-template-columns: repeat(2, 1fr); }
    .page-banner h1 { font-size: 32px; }
}
@media screen and (max-width: 768px) {
    .nav-list { position: fixed; top: 0; left: -100%; width: 80%; max-width: 320px; height: 100%; background: #fff; flex-direction: column; padding: 80px 30px 30px; box-shadow: 4px 0 20px rgba(0,0,0,0.15); transition: left 0.35s ease; gap: 0; overflow-y: auto; z-index: 1001; }
    .nav-list.active { left: 0; }
    .nav-list li a { display: block; padding: 14px 0; border-bottom: 1px solid #f0f0f0; font-size: 17px; }
    .nav-list li a::after { display: none; }
    .menu-btn { display: flex; }
    .menu-overlay.active { display: block; }
    .top-bar .container { justify-content: center; text-align: center; }
    .hotline { width: 100%; margin-bottom: 4px; }
    .page-banner { padding: 40px 0 30px; }
    .page-banner h1 { font-size: 26px; }
    .case-grid { grid-template-columns: 1fr; gap: 24px; }
    .case-card img { height: 200px; }
    .case-filter .filter-list li a { padding: 6px 18px; font-size: 13px; }
    .contact-banner h3 { font-size: 26px; }
    .tel-num { font-size: 28px; }
    .contact-btns a { padding: 12px 30px; font-size: 15px; width: 80%; }
    .footer-wrap { gap: 30px; }
    .footer-col { min-width: 100%; }
    .header .container { height: 60px; }
    .logo { font-size: 20px; }
}
@media screen and (max-width: 480px) {
    .page-banner h1 { font-size: 22px; }
    .page-banner p { font-size: 14px; }
    .contact-banner h3 { font-size: 22px; }
    .tel-num { font-size: 24px; }
    .case-card .case-body { padding: 16px 18px 18px; }
    .case-card h5 { font-size: 17px; }
}