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

body {
    font-family: Arial, "Microsoft YaHei", sans-serif;
    background: #f5f7fb;
    color: #1f2937;
    font-size: 14px;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    width: 1200px;
    margin: 0 auto;
}

/* header */
.site-header {
    background: #fff;
    border-bottom: 1px solid #edf0f5;
}

.header-inner {
    height: 68px;
    display: flex;
    align-items: center;
}

.logo {
    width: 210px;
}

.logo a {
    color: #ff5b22;
    font-size: 28px;
    font-weight: 800;
    font-style: italic;
}

.nav {
    flex: 1;
    display: flex;
    gap: 34px;
}

.nav a {
    height: 68px;
    line-height: 68px;
    color: #1f2937;
    font-weight: 600;
    position: relative;
}

.nav a:hover,
.nav a.active {
    color: #ff5b22;
}

.nav a.active::after {
    content: "";
    height: 2px;
    background: #ff5b22;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
}

.search-box form {
    width: 300px;
    height: 38px;
    display: flex;
    background: #f7f8fb;
    border: 1px solid #e8ecf2;
    border-radius: 20px;
    overflow: hidden;
}

.search-box input {
    flex: 1;
    border: 0;
    outline: 0;
    background: transparent;
    padding: 0 16px;
    color: #666;
}

.search-box button {
    width: 64px;
    border: 0;
    background: #ff5b22;
    color: #fff;
    cursor: pointer;
}

/* banner */
.about-banner {
    height: 230px;
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    position: relative;
    color: #fff;
    background-color: #0c2348;
}

.banner-mask {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(5, 18, 42, .88), rgba(5, 18, 42, .35));
}

.banner-content {
    height: 230px;
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.banner-content h1 {
    font-size: 38px;
    margin-bottom: 14px;
}

.banner-content p {
    color: #d8e4f6;
    font-size: 17px;
}

/* main */
.main {
    padding: 22px 0 46px;
}

.breadcrumb {
    color: #8b95a5;
    margin-bottom: 18px;
    font-size: 13px;
}

.breadcrumb a:hover {
    color: #ff5b22;
}

.about-section {
    background: #fff;
    border: 1px solid #edf0f5;
    border-radius: 8px;
    padding: 34px;
    margin-bottom: 22px;
}

/* title */
.section-title {
    margin-bottom: 24px;
}

.section-title span {
    color: #ff5b22;
    font-weight: 700;
    letter-spacing: 2px;
    font-size: 13px;
}

.section-title h2 {
    font-size: 30px;
    margin-top: 8px;
    color: #1f2937;
}

.section-title p {
    color: #6b7280;
    margin-top: 10px;
}

.section-title.center {
    text-align: center;
}

/* intro */
.intro-section {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 34px;
}

.intro-content {
    color: #374151;
    line-height: 2;
    font-size: 16px;
}

.intro-content p {
    margin-bottom: 16px;
}

.intro-content img {
    max-width: 100%;
    height: auto;
    margin: 18px 0;
    border-radius: 6px;
}

.intro-card {
    background: #f7f8fb;
    border: 1px solid #edf0f5;
    border-radius: 8px;
    padding: 24px;
}

.intro-card h3 {
    font-size: 22px;
    margin-bottom: 18px;
}

.intro-card ul {
    list-style: none;
}

.intro-card li {
    padding: 16px 0;
    border-bottom: 1px solid #e8ecf2;
}

.intro-card li:last-child {
    border-bottom: 0;
}

.intro-card strong {
    display: block;
    color: #1f2937;
    font-size: 16px;
    margin-bottom: 8px;
}

.intro-card p {
    color: #6b7280;
    line-height: 1.7;
}

/* stats */
.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
    margin-bottom: 22px;
}

.stat-item {
    background: #fff;
    border: 1px solid #edf0f5;
    border-radius: 8px;
    text-align: center;
    padding: 28px 10px;
}

.stat-item strong {
    display: block;
    color: #ff5b22;
    font-size: 36px;
    margin-bottom: 8px;
}

.stat-item span {
    color: #6b7280;
}

/* advantage */
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.advantage-card {
    background: #f7f8fb;
    border: 1px solid #edf0f5;
    border-radius: 8px;
    padding: 26px 22px;
    transition: .25s;
}

.advantage-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 28px rgba(15, 23, 42, .08);
}

.advantage-card i {
    display: block;
    font-style: normal;
    font-size: 34px;
    margin-bottom: 14px;
}

.advantage-card h3 {
    font-size: 19px;
    margin-bottom: 10px;
}

.advantage-card p {
    color: #6b7280;
    line-height: 1.8;
}

/* process */
.process-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}

.process-item {
    background: #f7f8fb;
    border: 1px solid #edf0f5;
    border-radius: 8px;
    padding: 26px 20px;
    position: relative;
}

.process-item em {
    display: block;
    color: #ff5b22;
    font-style: normal;
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 12px;
}

.process-item h3 {
    font-size: 19px;
    margin-bottom: 10px;
}

.process-item p {
    color: #6b7280;
    line-height: 1.8;
}

/* contact */
.contact-section {
    background: linear-gradient(120deg, #0b254d, #134b8f);
    border-radius: 8px;
    padding: 34px 42px;
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.contact-left h2 {
    font-size: 30px;
    margin-bottom: 12px;
}

.contact-left p {
    color: #d8e4f6;
    line-height: 1.8;
    max-width: 720px;
}

.contact-btn {
    display: block;
    width: 150px;
    height: 44px;
    line-height: 44px;
    text-align: center;
    background: #ff5b22;
    color: #fff;
    border-radius: 4px;
    font-weight: 700;
}

/* footer */
.footer {
    background: #fff;
    border-top: 1px solid #edf0f5;
    padding: 24px 0;
    text-align: center;
    color: #7b8494;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 34px;
    margin-bottom: 14px;
}

.footer-links a:hover {
    color: #ff5b22;
}

/* mobile */
@media (max-width: 1200px) {
    .container {
        width: 94%;
    }
}

@media (max-width: 900px) {
    .header-inner {
        height: auto;
        flex-wrap: wrap;
        padding: 14px 0;
    }

    .logo {
        width: 100%;
        margin-bottom: 10px;
    }

    .nav {
        width: 100%;
        overflow-x: auto;
        gap: 20px;
        margin-bottom: 12px;
    }

    .nav a {
        height: 40px;
        line-height: 40px;
        white-space: nowrap;
    }

    .search-box,
    .search-box form {
        width: 100%;
    }

    .about-banner,
    .banner-content {
        height: 190px;
    }

    .banner-content h1 {
        font-size: 30px;
    }

    .intro-section {
        grid-template-columns: 1fr;
    }

    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .advantage-grid,
    .process-list {
        grid-template-columns: 1fr;
    }

    .about-section {
        padding: 24px;
    }

    .contact-section {
        display: block;
        padding: 28px;
    }

    .contact-btn {
        margin-top: 20px;
    }
}