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

body {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: #666;
    background: #f7faff;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color .2s;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    color: #1f1f1f;
    margin-bottom: .5rem;
}

p {
    margin-bottom: 1rem;
}

.container {
    max-width: 95%;
    margin: 0 auto;
    padding: 0 20px;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -15px;
    position: relative;
}

[class*="col-"] {
    padding: 0 15px;
}

.col-12 {
    flex: 0 0 100%;
    max-width: 100%;
}

.col-6 {
    flex: 0 0 50%;
    max-width: 50%;
}

.col-4 {
    flex: 0 0 33.3333%;
    max-width: 33.3333%;
}

.col-3 {
    flex: 0 0 25%;
    max-width: 25%;
}

.col-2 {
    flex: 0 0 16.6667%;
    max-width: 16.6667%;
}

@media (min-width:768px) {
    .col-md-6 {
        flex: 0 0 50%;
        max-width: 50%;
    }

    .col-md-4 {
        flex: 0 0 33.3333%;
        max-width: 33.3333%;
    }

    .col-md-3 {
        flex: 0 0 25%;
        max-width: 25%;
    }
}

@media (min-width:992px) {
    .col-lg-6 {
        flex: 0 0 50%;
        max-width: 50%;
    }

    .col-lg-5 {
        flex: 0 0 41.6667%;
        max-width: 41.6667%;
    }

    .col-lg-7 {
        flex: 0 0 58.3333%;
        max-width: 58.3333%;
    }

    .col-lg-4 {
        flex: 0 0 33.3333%;
        max-width: 33.3333%;
    }

    .col-lg-3 {
        flex: 0 0 25%;
        max-width: 25%;
    }

    .col-lg-2 {
        flex: 0 0 16.6667%;
        max-width: 16.6667%;
    }

    .d-lg-block {
        display: block;
    }

    .d-lg-none {
        display: none;
    }
}

@media (max-width:991px) {
    .d-lg-block {
        display: none;
    }

    .d-lg-none {
        display: block;
        text-align: right;
    }
}

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

.bg-dark-blue {
    background: #0d2b4a;
}

.bg-black {
    background: #111;
}

/* === 公共按钮 === */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 15px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all .3s;
    text-align: center;
}

.btn-primary {
    background: #2086e5;
    color: #fff;
    border-color: #2086e5;
}

.btn-primary:hover {
    background: transparent;
    color: #2086e5;
}

.btn-outline-light {
    border-color: #fff;
    color: #fff;
}

.btn-outline-light:hover {
    background: #2086e5;
    border-color: #2086e5;
    color: #fff;
}

.btn-cta {
    background: #2086e5;
    color: #fff;
    border-color: #2086e5;
    font-weight: 700;
    padding: 12px 34px;
    box-shadow: 0 4px 14px rgba(32, 134, 229, .35);
}

.btn-cta:hover {
    background: transparent;
    border-color: #2086e5;
    color: #2086e5;
    transform: translateY(-2px);
}

.btn-cta i {
    margin-right: 8px;
}

/* === 公共头部 === */
.site-header {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 99;
    padding: 18px 0;
}

.site-header .logo img {
    max-height: 40px;
}

.site-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.site-nav ul li {
    margin: 0 16px;
}

.site-nav ul li a {
    color: #fff;
    font-weight: 500;
    font-size: 15px;
    padding: 8px 0;
    display: inline-block;
}

.site-nav ul li a:hover {
    color: #2086e5;
}

.header-actions {
    text-align: right;
}

.mobile-toggle {
    background: none;
    border: none;
    color: #fff;
    font-size: 28px;
    cursor: pointer;
    padding: 0 10px;
}

.mobile-menu-panel {
    background: #0d2b4a;
    padding: 20px;
    display: none;
}

.mobile-menu-panel.open {
    display: block;
}

.mobile-menu-panel ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-menu-panel ul li a {
    display: block;
    color: #fff;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, .06);
}

.mobile-menu-panel .btn-cta {
    margin-top: 16px;
    display: inline-block;
}

/* === 公共页脚 === */
.footer {
    color: rgba(255, 255, 255, .7);
    padding-top: 60px;
    padding-bottom: 30px;
}

.footer-widget {
    margin-bottom: 40px;
}

.footer-widget .logo img {
    max-height: 40px;
    margin-bottom: 16px;
}

.footer-widget p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-widget h5 {
    color: #fff;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 18px;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    padding: 4px 0;
}

.footer-links li a {
    color: rgba(255, 255, 255, .7);
    font-size: 14px;
    transition: .3s;
}

.footer-links li a:hover {
    color: #2086e5;
    padding-left: 6px;
}

.footer-contact {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 4px 0;
    font-size: 14px;
}

.footer-contact li i {
    color: #2086e5;
    font-size: 18px;
    width: 24px;
    text-align: center;
}

.footer-copy {
    border-top: 1px solid rgba(255, 255, 255, .06);
    padding-top: 28px;
    margin-top: 20px;
    text-align: center;
    font-size: 14px;
}

.footer-copy a {
    color: #2086e5;
}

/* === 公共回到顶部 === */
.scroll-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    z-index: 99;
    display: none;
}

.scroll-top a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: #2086e5;
    color: #fff;
    font-size: 20px;
    box-shadow: 0 4px 20px rgba(32, 134, 229, .35);
    transition: .3s;
}

.scroll-top a:hover {
    background: #0d2b4a;
    color: #fff;
    transform: translateY(-4px);
}

@media (max-width:991px) {

    .site-nav {
        display: none;
    }

    .header-actions {
        display: none;
    }
}

@media (max-width:767px) {

    .footer-widget {
        margin-bottom: 30px;
    }

    .footer-widget h5 {
        font-size: 18px;
    }

    .scroll-top {
        bottom: 20px;
        right: 20px;
    }

    .scroll-top a {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
}

@media (max-width:480px) {
    .container {
        padding: 0 12px;
    }
}

/* 公共响应式微调（头部/底部） */
@media (max-width:991px) {
    .site-nav {
        display: none;
    }

    .header-actions {
        display: none;
    }
}

@media (max-width:767px) {
    .footer-widget {
        margin-bottom: 30px;
    }

    .footer-widget h5 {
        font-size: 18px;
    }

    .scroll-top {
        bottom: 20px;
        right: 20px;
    }

    .scroll-top a {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
}