/* ========== 导航栏 ========== */
header {
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 100;
        }
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    /* box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1); */
    z-index: 1000;
    transition: all 0.3s ease;
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}
.logo {
    font-size: 24px;
    font-weight: 700;
    color: #1a56db;
    letter-spacing: -0.5px;
}
.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}
.nav-menu a {
    text-decoration: none;
    color: #4b5563;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    padding: 5px 0;
}
.nav-menu a:hover { color: #1a56db; }
.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #1a56db;
    transition: width 0.3s ease;
}
.nav-menu a:hover::after { width: 100%; }
.phone-btn {
    visibility:hidden;
    background: linear-gradient(135deg, #1a56db, #0e3aa5);
    color: white;
    padding: 10px 24px;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(26, 86, 219, 0.3);
}
.phone-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(26, 86, 219, 0.4);
}
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #1e3c72;
}
@media (max-width: 768px) {
    .nav-menu { display: none; }
    .mobile-menu-btn { display: block; }
}

/* ========== 页脚 ========== */
.footer {
    background: linear-gradient(135deg, #1e3c72, #0e3aa5);
    color: white;
    padding: 60px 0 30px;
    text-align: center;
}
.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 35px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}
.footer-links a {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
}
.footer-links a:hover {
    color: white;
    text-decoration: underline;
}
.footer-contact {
    margin-bottom: 25px;
    font-size: 18px;
}
.footer-contact p { margin: 8px 0; opacity: 0.9; }
.copyright {
    opacity: 0.7;
    font-size: 15px;
    margin-top: 25px;
}

/* 表格样式独立，不干扰原页面 */
.comparison-table-wrapper {
    overflow-x: auto;
    margin-top: 20px;
}
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    line-height: 1.4;
    background: #fff;
}
.comparison-table th,
.comparison-table td {
    border: 1px solid #e5e7eb;
    padding: 10px 8px;
    text-align: left;
    vertical-align: top;
}
.comparison-table th {
    background: #d3e2fa;
    color: #1e40af;
    font-weight: 600;
}
.comparison-table .highlight {
    background-color: #f1f5f9;
    font-weight: 600;
}
@media (max-width: 768px) {
    .comparison-table {
        font-size: 12px;
    }
    .comparison-table th,
    .comparison-table td {
        padding: 6px 4px;
    }
}
@media (min-width: 1200px) {
    .products-grid {
        grid-template-columns: repeat(4, 1fr);   /* 大屏强制 4 列 */
    }
}