html {
    scroll-behavior: smooth;
}

body {
    background-color: #f7f9fc;
    color: #141c2f;
}

/* 顶部导航 */
.navbar {
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid rgba(20, 28, 47, 0.06);
    box-shadow: 0 1px 10px rgba(20, 28, 47, 0.04);
}

.nav-link {
    position: relative;
    color: #2a3654;
    font-weight: 500;
    font-size: 14px;
    transition: color 0.25s ease;
}

.nav-link:hover {
    color: #1634b8;
}

.nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 0;
    height: 2px;
    background: #2f61ff;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* 轮播 */
.carousel {
    position: relative;
    height: 560px;
    overflow: hidden;
    background: #0b1220;
}

.carousel-track {
    display: flex;
    height: 100%;
    transition: transform 0.7s cubic-bezier(0.65, 0, 0.35, 1);
}

.carousel-item {
    min-width: 100%;
    height: 100%;
    position: relative;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.carousel-mask {
    position: absolute;
    inset: 0;
    background: linear-gradient(105deg, rgba(11, 18, 32, 0.88) 0%, rgba(20, 42, 80, 0.6) 55%, rgba(20, 28, 47, 0.45) 100%);
}

.carousel-content {
    position: relative;
    z-index: 3;
    height: 100%;
    display: flex;
    align-items: center;
}

.carousel-title {
    font-size: 48px;
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: 1px;
    color: #ffffff;
    margin-bottom: 18px;
    text-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.carousel-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.86);
    margin-bottom: 30px;
    max-width: 640px;
}

.btn-primary {
    display: inline-block;
    padding: 14px 34px;
    background: #2f61ff;
    color: #ffffff;
    font-weight: 600;
    border-radius: 6px;
    transition: all 0.3s ease;
    border: 1px solid #2f61ff;
}

.btn-primary:hover {
    background: #1a43e0;
    border-color: #1a43e0;
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(47, 97, 255, 0.35);
}

.btn-ghost {
    display: inline-block;
    padding: 14px 34px;
    background: transparent;
    color: #ffffff;
    font-weight: 600;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.6);
    transition: all 0.3s ease;
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: #ffffff;
    transform: translateY(-2px);
}

.carousel-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 4;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.carousel-arrow:hover {
    background: rgba(47, 97, 255, 0.9);
    border-color: #2f61ff;
}

.carousel-arrow.left {
    left: 28px;
}

.carousel-arrow.right {
    right: 28px;
}

.carousel-dots {
    position: absolute;
    bottom: 34px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    gap: 10px;
    z-index: 4;
}

.carousel-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.45);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.carousel-dot.active {
    background: #2f61ff;
    width: 30px;
    border-radius: 10px;
}

/* 通用区块标题 */
.section {
    padding: 110px 0;
}

.section-label {
    display: inline-block;
    font-size: 13px;
    letter-spacing: 4px;
    color: #2f61ff;
    font-weight: 700;
    margin-bottom: 14px;
    text-transform: uppercase;
}

.section-title {
    font-size: 34px;
    font-weight: 800;
    color: #0b1220;
    margin-bottom: 18px;

    letter-spacing: 1px;
}

.section-desc {
    font-size: 16px;
    color: #5a6785;
    line-height: 1.8;
    max-width: 720px;
}

.divider {
    width: 48px;
    height: 4px;
    background: linear-gradient(90deg, #2f61ff, #6f8cff);
    border-radius: 2px;
    margin-bottom: 30px;
}

/* 关于我们 */
.about-card {
    background: #ffffff;
    border-radius: 14px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(20, 28, 47, 0.05);
    border: 1px solid rgba(20, 28, 47, 0.04);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.about-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(20, 42, 80, 0.09);
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 14px 0;
    border-bottom: 1px dashed rgba(20, 28, 47, 0.08);
}

.info-item:last-child {
    border-bottom: none;
}

.info-icon {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    background: #eef4ff;
    color: #1634b8;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

/* 主营业务 */
.business-card {
    background: #ffffff;
    border-radius: 14px;
    padding: 44px 34px;
    text-align: center;
    border: 1px solid rgba(20, 28, 47, 0.04);
    box-shadow: 0 10px 30px rgba(20, 28, 47, 0.04);
    transition: all 0.35s ease;
    height: 100%;
}

.business-card:hover {
    transform: translateY(-8px);
    border-color: #2f61ff;
    box-shadow: 0 24px 48px rgba(47, 97, 255, 0.14);
}

.business-icon {
    width: 76px;
    height: 76px;
    border-radius: 20px;
    background: linear-gradient(135deg, #eaf1ff, #c6daff);
    color: #142a92;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 30px;
}

/* 运力优势 */
.advantage-row {
    background: #ffffff;
    border-radius: 14px;
    padding: 34px;
    border: 1px solid rgba(20, 28, 47, 0.04);
    box-shadow: 0 10px 30px rgba(20, 28, 47, 0.04);
    transition: all 0.3s ease;
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.advantage-row:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(20, 42, 80, 0.09);
}

.advantage-num {
    width: 54px;
    height: 54px;
    border-radius: 14px;
    background: linear-gradient(135deg, #2f61ff, #6f8cff);
    color: #ffffff;
    font-size: 22px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* 企业理念 */
.culture-box {
    background: linear-gradient(135deg, #0b1220 0%, #142a92 100%);
    border-radius: 18px;
    padding: 60px;
    color: #ffffff;
    position: relative;
    overflow: hidden;
}

.culture-box::before {
    content: "";
    position: absolute;
    right: -80px;
    top: -80px;
    width: 320px;
    height: 320px;
    background: radial-gradient(circle, rgba(47, 97, 255, 0.35), transparent 70%);
    border-radius: 50%;
}

.culture-title {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.culture-text {
    font-size: 16px;
    line-height: 1.9;
    color: rgba(255, 255, 255, 0.82);
    position: relative;
    z-index: 1;
}

/* 联系我们 */
.contact-panel {
    background: #ffffff;
    border-radius: 18px;
    padding: 56px;
    box-shadow: 0 20px 50px rgba(20, 28, 47, 0.06);
    border: 1px solid rgba(20, 28, 47, 0.04);
}

.contact-item {
    display: flex;
    gap: 18px;
    padding: 20px 0;
    border-bottom: 1px solid rgba(20, 28, 47, 0.06);
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: #eef4ff;
    color: #1634b8;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

/* 页脚 */
.footer {
    background: #0b1220;
    color: rgba(255, 255, 255, 0.72);

    padding: 60px 0 24px;
}

.footer-title {
    color: #ffffff;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 14px;
}

/* 返回顶部 */
.back-top {
    position: fixed;
    right: 30px;
    bottom: 30px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: #2f61ff;
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 10px 24px rgba(47, 97, 255, 0.45);
    z-index: 50;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.back-top.show {
    opacity: 1;
    visibility: visible;
}

/* 移动端 */
@media (max-width: 768px) {
    .carousel {
        height: 440px;
    }

    .carousel-title {
        font-size: 30px;
    }

    .carousel-subtitle {
        font-size: 15px;
    }

    .section {
        padding: 72px 0;
    }

    .culture-box,
    .contact-panel {
        padding: 34px 24px;
    }
}