/* Reset & Common */
body {
    font-family: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", sans-serif;
    color: #333;
    -webkit-font-smoothing: antialiased;
    line-height: 1.6;
}

a {
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

a:hover, a:focus {
    text-decoration: none;
}

/* Navbar */
.navbar-default {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    border: none;
    padding: 15px 0;
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    backdrop-filter: blur(10px);
}

.navbar-default.navbar-scrolled {
    padding: 8px 0;
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 6px 20px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-size: 26px;
    font-weight: 800;
    color: #409EFF !important;
    padding-top: 10px;
    letter-spacing: -0.5px;
    transition: all 0.3s;
}

.navbar-scrolled .navbar-brand {
    font-size: 24px;
}

.navbar-nav > li > a {
    font-size: 16px;
    font-weight: 500;
    color: #303133 !important;
    padding-top: 20px;
    padding-bottom: 20px;
    position: relative;
    transition: color 0.3s;
}

/* Navbar Link Underline Animation */
.navbar-nav > li > a::after {
    content: '';
    position: absolute;
    bottom: 12px;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: #409EFF;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    transform: translateX(-50%);
}

.navbar-nav > li:hover > a::after,
.navbar-nav > li.active > a::after {
    width: 80%;
}

.navbar-nav > li.active > a,
.navbar-nav > li > a:hover {
    color: #409EFF !important;
    background-color: transparent !important;
}

/* Mobile Toggle Button */
.navbar-toggle {
    border: none;
    background-color: transparent !important;
    margin-top: 18px;
}

.navbar-toggle .icon-bar {
    background-color: #303133;
    width: 24px;
    height: 2px;
    border-radius: 1px;
    transition: all 0.3s;
}

.navbar-toggle:hover .icon-bar {
    background-color: #409EFF;
}

/* When opened */
.navbar-toggle[aria-expanded="true"] .icon-bar:nth-child(2) {
    transform: rotate(45deg) translate(5px, 5px);
}
.navbar-toggle[aria-expanded="true"] .icon-bar:nth-child(3) {
    opacity: 0;
}
.navbar-toggle[aria-expanded="true"] .icon-bar:nth-child(4) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.navbar-btn {
    margin-top: 12px;
    border-radius: 20px;
    padding: 8px 25px;
    font-weight: 500;
    box-shadow: 0 4px 6px rgba(64, 158, 255, 0.2);
    transition: all 0.3s;
    border: none;
    background: linear-gradient(135deg, #409EFF 0%, #3a8ee6 100%);
}

.navbar-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(64, 158, 255, 0.3);
    background: linear-gradient(135deg, #66b1ff 0%, #409EFF 100%);
}

/* Hero Carousel */
.carousel-inner .item {
    height: 650px;
    background-size: cover;
    background-position: center;
}

.carousel-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(rgba(0,0,0,0.2), rgba(0,0,0,0.5));
}

.carousel-caption {
    bottom: 25%;
    padding-bottom: 30px;
}

.carousel-caption h1 {
    font-size: 56px;
    font-weight: 800;
    text-shadow: 0 4px 8px rgba(0,0,0,0.3);
    margin-bottom: 25px;
    letter-spacing: 1px;
}

.carousel-caption p {
    font-size: 22px;
    margin-bottom: 40px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    font-weight: 300;
}

.btn-lg {
    padding: 12px 35px;
    font-size: 18px;
    border-radius: 30px;
}

/* Sections */
.section-container {
    padding: 100px 0;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 15px;
    color: #303133;
    position: relative;
    display: inline-block;
}

.section-subtitle {
    font-size: 18px;
    color: #909399;
    margin-bottom: 40px;
}

.section-divider {
    width: 60px;
    height: 5px;
    background-color: #409EFF;
    margin: 20px auto;
    border-radius: 3px;
}

.bg-gray {
    background-color: #f5f7fa;
}

/* Service Cards */
.service-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 6px 18px rgba(0,0,0,0.06);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    margin-bottom: 30px;
    height: 340px;
    border: 1px solid #ebeef5;
}

.hover-lift:hover {
    transform: translateY(-12px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.12);
}

.service-icon-wrapper {
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    position: relative;
}

.service-icon-wrapper::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 0;
    right: 0;
    height: 40px;
    background: #fff;
    transform: skewY(-4deg);
}

.service-icon {
    font-size: 56px;
    z-index: 1;
}

.service-content {
    padding: 25px;
    text-align: center;
}

.service-content h3 {
    margin-top: 10px;
    margin-bottom: 15px;
    font-size: 22px;
    font-weight: 600;
    color: #303133;
}

.service-content p {
    color: #606266;
    margin-bottom: 20px;
    height: 48px;
    overflow: hidden;
    font-size: 15px;
}

/* Data Section */
.data-section {
    background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
    color: #fff;
    position: relative;
    background-attachment: fixed;
}

.section-title.text-white {
    color: #fff;
}

.section-divider.bg-white {
    background-color: #fff;
    opacity: 0.8;
}

.data-item {
    margin-bottom: 40px;
    padding: 20px;
}

.data-item .number {
    font-size: 56px;
    font-weight: 800;
    font-family: 'DIN Alternate', 'Arial', sans-serif;
    margin-bottom: 10px;
    background: linear-gradient(to bottom, #fff 0%, #e0e0e0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 5px 15px rgba(0,0,0,0.15);
}

.data-item .label {
    font-size: 20px;
    opacity: 0.9;
    font-weight: 300;
}

/* Footer */
.footer {
    background-color: #26292e;
    color: #909399;
    padding: 80px 0 30px;
    font-size: 14px;
}

.footer h3 {
    font-size: 18px;
    color: #fff;
    margin-bottom: 30px;
    font-weight: 600;
    position: relative;
    padding-bottom: 15px;
    letter-spacing: 0.5px;
}

.footer h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: #409EFF;
}

.footer p {
    margin-bottom: 15px;
    line-height: 1.8;
}

.footer ul.list-unstyled li {
    margin-bottom: 12px;
}

.footer a {
    color: #909399;
    text-decoration: none;
    transition: all 0.3s;
    display: inline-block;
}

.footer a:hover {
    color: #409EFF;
    padding-left: 5px;
}

.footer-bottom {
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.05);
    font-size: 13px;
    color: #606266;
}

/* Back to Top */
#back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    z-index: 9999;
    width: 50px;
    height: 50px;
    text-align: center;
    line-height: 46px;
    background: #409EFF;
    color: #fff;
    cursor: pointer;
    border-radius: 50%;
    display: none;
    font-size: 20px;
    box-shadow: 0 4px 15px rgba(64, 158, 255, 0.4);
    transition: all 0.3s;
}

#back-to-top:hover {
    background: #66b1ff;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(64, 158, 255, 0.5);
}

/* Responsive Fixes */
@media (max-width: 768px) {
    .navbar-brand { font-size: 22px; }
    .carousel-inner .item { height: 400px; }
    .carousel-caption h1 { font-size: 32px; margin-bottom: 10px; }
    .carousel-caption p { font-size: 16px; margin-bottom: 20px; }
    .section-container { padding: 60px 0; }
    .section-title { font-size: 30px; }
    .data-item .number { font-size: 36px; }
    .footer { padding: 40px 0 20px; }
    .footer h3 { margin-top: 30px; }
}