* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

/* ===== Flex 通用类 ===== */

/* Flex 容器 */
.flex { display: flex; }
.inline-flex { display: inline-flex; }

/* Flex 方向 */
.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }
.flex-row-reverse { flex-direction: row-reverse; }
.flex-col-reverse { flex-direction: column-reverse; }

/* Flex 换行 */
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }
.flex-wrap-reverse { flex-wrap: wrap-reverse; }

/* 主轴对齐 (justify-content) */
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-evenly { justify-content: space-evenly; }

/* 交叉轴对齐 (align-items) */
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.items-center { align-items: center; }
.items-baseline { align-items: baseline; }
.items-stretch { align-items: stretch; }

/* 多行对齐 (align-content) */
.content-start { align-content: flex-start; }
.content-end { align-content: flex-end; }
.content-center { align-content: center; }
.content-between { align-content: space-between; }
.content-around { align-content: space-around; }
.content-stretch { align-content: stretch; }

/* Flex 项属性 */
.flex-1 { flex: 1 1 0%; }
.flex-auto { flex: 1 1 auto; }
.flex-none { flex: none; }
.flex-initial { flex: 0 1 auto; }

.flex-grow-0 { flex-grow: 0; }
.flex-grow { flex-grow: 1; }

.flex-shrink-0 { flex-shrink: 0; }
.flex-shrink { flex-shrink: 1; }

/* 单个 flex 项对齐 (align-self) */
.self-auto { align-self: auto; }
.self-start { align-self: flex-start; }
.self-end { align-self: flex-end; }
.self-center { align-self: center; }
.self-stretch { align-self: stretch; }
.self-baseline { align-self: baseline; }

/* Flex 间距 (gap) */
.gap-0 { gap: 0; }
.gap-1 { gap: 4px; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.gap-5 { gap: 20px; }
.gap-6 { gap: 24px; }
.gap-8 { gap: 32px; }
.gap-10 { gap: 40px; }
.gap-12 { gap: 48px; }

/* 行间距 (row-gap) */
.gap-y-1 { row-gap: 4px; }
.gap-y-2 { row-gap: 8px; }
.gap-y-3 { row-gap: 12px; }
.gap-y-4 { row-gap: 16px; }
.gap-y-5 { row-gap: 20px; }
.gap-y-6 { row-gap: 24px; }

/* 列间距 (column-gap) */
.gap-x-1 { column-gap: 4px; }
.gap-x-2 { column-gap: 8px; }
.gap-x-3 { column-gap: 12px; }
.gap-x-4 { column-gap: 16px; }
.gap-x-5 { column-gap: 20px; }
.gap-x-6 { column-gap: 24px; }


.w-0 {width: 0;}
.w-full {width: 100%;}
.h-0 {height: 0;}
.h-full {height: 100%;}

/* Padding */
.p-0 {padding: 0;}
.p-1 {padding: 4px;}
.p-2 {padding: 8px;}
.p-3 {padding: 12px;}
.p-4 {padding: 16px;}
.p-5 {padding: 20px;}
.p-6 {padding: 24px;}
.p-8 {padding: 32px;}
.p-10 {padding: 40px;}
.p-12 {padding: 48px;}

.px-0 {padding-left: 0; padding-right: 0;}
.px-1 {padding-left: 4px; padding-right: 4px;}
.px-2 {padding-left: 8px; padding-right: 8px;}
.px-3 {padding-left: 12px; padding-right: 12px;}
.px-4 {padding-left: 16px; padding-right: 16px;}
.px-5 {padding-left: 20px; padding-right: 20px;}
.px-6 {padding-left: 24px; padding-right: 24px;}
.px-8 {padding-left: 32px; padding-right: 32px;}
.px-10 {padding-left: 40px; padding-right: 40px;}
.px-12 {padding-left: 48px; padding-right: 48px;}

.py-0 {padding-top: 0; padding-bottom: 0;}
.py-1 {padding-top: 4px; padding-bottom: 4px;}
.py-2 {padding-top: 8px; padding-bottom: 8px;}
.py-3 {padding-top: 12px; padding-bottom: 12px;}
.py-4 {padding-top: 16px; padding-bottom: 16px;}
.py-5 {padding-top: 20px; padding-bottom: 20px;}
.py-6 {padding-top: 24px; padding-bottom: 24px;}
.py-8 {padding-top: 32px; padding-bottom: 32px;}
.py-10 {padding-top: 40px; padding-bottom: 40px;}
.py-12 {padding-top: 48px; padding-bottom: 48px;}

.pt-0 {padding-top: 0;}
.pt-1 {padding-top: 4px;}
.pt-2 {padding-top: 8px;}
.pt-3 {padding-top: 12px;}
.pt-4 {padding-top: 16px;}
.pt-5 {padding-top: 20px;}
.pt-6 {padding-top: 24px;}
.pt-8 {padding-top: 32px;}
.pt-10 {padding-top: 40px;}
.pt-12 {padding-top: 48px;}

.pb-0 {padding-bottom: 0;}
.pb-1 {padding-bottom: 4px;}
.pb-2 {padding-bottom: 8px;}
.pb-3 {padding-bottom: 12px;}
.pb-4 {padding-bottom: 16px;}
.pb-5 {padding-bottom: 20px;}
.pb-6 {padding-bottom: 24px;}
.pb-8 {padding-bottom: 32px;}
.pb-10 {padding-bottom: 40px;}
.pb-12 {padding-bottom: 48px;}

.pl-0 {padding-left: 0;}
.pl-1 {padding-left: 4px;}
.pl-2 {padding-left: 8px;}
.pl-3 {padding-left: 12px;}
.pl-4 {padding-left: 16px;}
.pl-5 {padding-left: 20px;}
.pl-6 {padding-left: 24px;}
.pl-8 {padding-left: 32px;}
.pl-10 {padding-left: 40px;}
.pl-12 {padding-left: 48px;}

.pr-0 {padding-right: 0;}
.pr-1 {padding-right: 4px;}
.pr-2 {padding-right: 8px;}
.pr-3 {padding-right: 12px;}
.pr-4 {padding-right: 16px;}
.pr-5 {padding-right: 20px;}
.pr-6 {padding-right: 24px;}
.pr-8 {padding-right: 32px;}
.pr-10 {padding-right: 40px;}
.pr-12 {padding-right: 48px;}

/* Margin */
.m-0 {margin: 0;}
.m-1 {margin: 4px;}
.m-2 {margin: 8px;}
.m-3 {margin: 12px;}
.m-4 {margin: 16px;}
.m-5 {margin: 20px;}
.m-6 {margin: 24px;}
.m-8 {margin: 32px;}
.m-10 {margin: 40px;}
.m-12 {margin: 48px;}
.m-auto {margin: auto;}

.mx-0 {margin-left: 0; margin-right: 0;}
.mx-1 {margin-left: 4px; margin-right: 4px;}
.mx-2 {margin-left: 8px; margin-right: 8px;}
.mx-3 {margin-left: 12px; margin-right: 12px;}
.mx-4 {margin-left: 16px; margin-right: 16px;}
.mx-5 {margin-left: 20px; margin-right: 20px;}
.mx-6 {margin-left: 24px; margin-right: 24px;}
.mx-8 {margin-left: 32px; margin-right: 32px;}
.mx-10 {margin-left: 40px; margin-right: 40px;}
.mx-12 {margin-left: 48px; margin-right: 48px;}
.mx-auto {margin-left: auto; margin-right: auto;}

.my-0 {margin-top: 0; margin-bottom: 0;}
.my-1 {margin-top: 4px; margin-bottom: 4px;}
.my-2 {margin-top: 8px; margin-bottom: 8px;}
.my-3 {margin-top: 12px; margin-bottom: 12px;}
.my-4 {margin-top: 16px; margin-bottom: 16px;}
.my-5 {margin-top: 20px; margin-bottom: 20px;}
.my-6 {margin-top: 24px; margin-bottom: 24px;}
.my-8 {margin-top: 32px; margin-bottom: 32px;}
.my-10 {margin-top: 40px; margin-bottom: 40px;}
.my-12 {margin-top: 48px; margin-bottom: 48px;}

.mt-0 {margin-top: 0;}
.mt-1 {margin-top: 4px;}
.mt-2 {margin-top: 8px;}
.mt-3 {margin-top: 12px;}
.mt-4 {margin-top: 16px;}
.mt-5 {margin-top: 20px;}
.mt-6 {margin-top: 24px;}
.mt-8 {margin-top: 32px;}
.mt-10 {margin-top: 40px;}
.mt-12 {margin-top: 48px;}

.mb-0 {margin-bottom: 0;}
.mb-1 {margin-bottom: 4px;}
.mb-2 {margin-bottom: 8px;}
.mb-3 {margin-bottom: 12px;}
.mb-4 {margin-bottom: 16px;}
.mb-5 {margin-bottom: 20px;}
.mb-6 {margin-bottom: 24px;}
.mb-8 {margin-bottom: 32px;}
.mb-10 {margin-bottom: 40px;}
.mb-12 {margin-bottom: 48px;}

.ml-0 {margin-left: 0;}
.ml-1 {margin-left: 4px;}
.ml-2 {margin-left: 8px;}
.ml-3 {margin-left: 12px;}
.ml-4 {margin-left: 16px;}
.ml-5 {margin-left: 20px;}
.ml-6 {margin-left: 24px;}
.ml-8 {margin-left: 32px;}
.ml-10 {margin-left: 40px;}
.ml-12 {margin-left: 48px;}
.ml-auto {margin-left: auto;}

.mr-0 {margin-right: 0;}
.mr-1 {margin-right: 4px;}
.mr-2 {margin-right: 8px;}
.mr-3 {margin-right: 12px;}
.mr-4 {margin-right: 16px;}
.mr-5 {margin-right: 20px;}
.mr-6 {margin-right: 24px;}
.mr-8 {margin-right: 32px;}
.mr-10 {margin-right: 40px;}
.mr-12 {margin-right: 48px;}
.mr-auto {margin-right: auto;}

.relative {
    position: relative;
}
.absolute {
    position: absolute;
}

.download {
    width: 20px;
    height: 20px;
    background: url('static/imgs/5.png') no-repeat center center;
    background-size: cover;
    display: inline-block;
    margin-right: 8px;
    vertical-align: middle;
}

.b1 { 
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('static/imgs/b1.png') no-repeat center center;
    background-size: cover;
}

.b2 { 
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('static/imgs/b2.png') no-repeat center center;
    background-size: cover;
    z-index: -1;
}
.b5 { 
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('static/imgs/b5.png') no-repeat center center;
    background-size: cover;
    z-index: -1;
}
.container {
    width: 1410px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
header {
    background: white;
    box-shadow: none;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: box-shadow 0.3s ease;
}

header.scrolled {
    box-shadow: 0 2px 12px rgba(0,0,0,0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    /* padding: 15px 0; */
    padding-top: 15px;
    padding-bottom: 15px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: bold;
    color: #333;
}

.l {
    width: 200px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.l-big {
    width: 568px;
    height: 101px;
    background: url('static/imgs/logo/2.png') no-repeat center center;
    background-size: 100% 100%;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #ff9500, #ff6b00);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 50px;
}

nav a {
    text-decoration: none;
    color: #666;
    /* font-size: 14px; */
    transition: color 0.3s;
}

nav a:hover {
    color: #4A90E2;
}

/* Dropdown Styles */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

.dropdown-toggle::after {
    /* content: '\f107';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 12px; */
    content: '';
    display: inline-block;
    width: 12px;
    height: 16px;
    transition: transform 0.3s;
    background: url(static/imgs/6.png) no-repeat center center;
    background-size: cover;
}

.dropdown:hover .dropdown-toggle::after {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    min-width: 200px;
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 200;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    color: #666;
    text-decoration: none;
    transition: background 0.3s, color 0.3s;
}

.dropdown-menu a:hover {
    background: #f5f5f5;
    color: #4A90E2;
}

/* Hero Section */
.hero {
    padding: 37px 0;
    position: relative;
}

.features-grid {
    display: flex;
    gap: 15px;
}

.feature-card {
    /* background: white; */
    border-radius: 30px;
    overflow: hidden;
    /* box-shadow: 0 4px 12px rgba(0,0,0,0.08); */
    transition: flex 0.4s ease;
    cursor: pointer;
    flex: 1;
    min-width: 310px;
    height: 560px;
    border: 1px solid #F3F4F6;
}

.feature-card.collapsed {
    flex: 0 0 200px;
}

.feature-card.expanded {
    flex: 1;
}

.feature-card-inner {
    width: 100%;
    /* min-width: 900px; */
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
}

.feature-card.expanded .feature-card-inner {
    min-width: 100%;
}

.feature-card.collapsed .feature-content {
    opacity: 0.4;
}

.feature-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    z-index: 0;
    min-width: 700px;
}

/* .feature-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, rgba(255,255,255,0.1), rgba(255,255,255,0.9));
} */

.feature-content {
    padding: 20px;
    transition: all 0.4s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    z-index: 1;
    min-width: 700px;
    flex-wrap: nowrap;
}

.feature-content-left {
    flex: 1;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.feature-content-left .timgs {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    
}
.feature-content-left .timgs img {
    width: 100%;
}

.feature-content-right {
    flex-shrink: 0;
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 15px;
    font-size: 16px;
    font-weight: 500;
}

.feature-icon i {
    color: #4A90E2;
}

.feature-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #333;
}

.feature-desc {
    font-size: 14px;
    color: #666;
    margin-bottom: 20px;
    line-height: 1.5;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: #5C91FD;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    transition: background 0.3s;
}

.btn:hover {
    background: #3a7bc8;
}

/* Services Section */
.section {
    padding: 60px 0;
    text-align: center;
    position: relative;
}

.section-title {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 40px;
    color: #333;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(435px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.service-card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transition: transform 0.3s;
    text-align: left;
}

.service-card:hover {
    transform: translateY(-5px);
}

.service-icon {
    width: 60px;
    height: 60px;
    /* background: #ff9500; */
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    /* margin: 0 auto 20px; */
    /* margin: 20px 0; */
    margin-bottom: 10px;
    color: white;
    font-size: 28px;
}

.service-icon  img {
    width: 100%;
}

.service-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
}

.service-desc {
    font-size: 14px;
    color: #666;
    margin-bottom: 20px;
    line-height: 1.5;
    min-height: 40px;
}

/* Testimonials Section */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(435px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.testimonial-card {
    position: relative;
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    text-align: left;
}

.testimonial-text {
    font-size: 14px;
    color: #666;
    margin-bottom: 20px;
    line-height: 1.6;
}

.testimonial-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 50px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: #666;
}

.user-name {
    font-size: 14px;
    font-weight: 500;
    color: #333;
}

.rating {
    color: #ffc107;
}

/* Footer */
footer {
    background: white;
    padding: 60px 0 30px;
    border-top: 1px solid #eee;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    /* align-items: center; */
    gap: 10px;
    font-size: 20px;
    font-weight: bold;
    color: #333;
}

.footer-links h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #333;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    text-decoration: none;
    color: #666;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #4A90E2;
}

.footer-contact h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: #333;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    font-size: 14px;
    color: #666;
}

.contact-item i {
    color: #4A90E2;
    width: 20px;
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #eee;
    font-size: 12px;
    color: #999;
}

/* Responsive Design */
/* @media (max-width: 1410px) {
    body {
        overflow-x: auto;
    }
} */
/* 
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
    }

    nav ul {
        gap: 15px;
    }

    .section-title {
        font-size: 24px;
    }
} */