:root {
    --primary-dark: #0a1128;
    --primary-blue: #1565c0;
    --accent-blue: #0d47a1;
    --highlight-blue: #0c7dcf;
    --green-accent: #4caf50;
    --light-gray: #f5f9ff;
    --border-radius: 8px;
    --box-shadow: 0 10px 30px rgba(0, 40, 100, 0.2);
    --nav-height: 85px;
    --gradient-start: #007cf0;
    --gradient-end: #00dfd8;

    
    --primary: #0a84ff;
    --primary-dark: #0066cc;
    --secondary: #00d0ff;
    --accent: #00ffb9;
    --dark-bg: #0a0f1e;
    --card-bg: rgba(20, 30, 48, 0.8);
    --text-main: #e6f1ff;
    --text-light: #8fa3c0;
    --glass-border: rgba(100, 150, 255, 0.1);
}

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

body {
    color: #333;
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;

    background: linear-gradient(135deg, var(--dark-bg) 0%, #131a35 100%);
    color: var(--text-main);
    line-height: 1.8;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 10% 20%, rgba(10, 132, 255, 0.05) 0%, transparent 30%),
        radial-gradient(circle at 90% 70%, rgba(0, 208, 255, 0.05) 0%, transparent 30%);
    z-index: -1;
}

/* 顶部导航栏（浮动） */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(8px);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.12);
    z-index: 1000;
    display: flex;
    justify-content: center;
    transition: all 0.4s ease;
}

.nav-container {
    width: 100%;
    max-width: 1400px;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
}

.logo-wrapper {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-circle {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-blue), var(--primary-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-circle i {
    color: white;
    font-size: 28px;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-main {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-blue);
    letter-spacing: 0.5px;
}

.logo-sub {
    font-size: 14px;
    color: #5f6368;
    margin-top: 2px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
    align-items: center;
}

.nav-link {
    color: #333;
    text-decoration: none;
    font-size: 17px;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: all 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width 0.3s ease;
}

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

.nav-link:hover {
    color: var(--primary-blue);
}

.nav-btn {    
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 5px 20px;
    font-weight: 700;
    color: white;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    border-radius: 50px;
    text-decoration: none;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.nav-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
}

/* 横幅区域 */
.banner {
    margin-top: var(--nav-height);
    width: 100%;
    height: 85vh;
    min-height: 650px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #0a1128;
}

.banner-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('../images/bannerbg.jpg') no-repeat center center;
    background-size: cover;
    opacity: 0.6;
    /* filter: blur(1px); */
}

.banner-content {
    position: relative;
    z-index: 5;
    max-width: 1400px;
    width: 100%;
    padding: 0 40px;
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.problem-title {
    font-size: 54px;
    font-weight: 700;
    line-height: 1.3;
}

.problem-subtitle {
    font-size: 28px;
    font-weight: 600;
    max-width: 900px;
    line-height: 1.6;
}

.value-container {
    backdrop-filter: blur(8px);
    padding: 15px 50px;
    border-radius: 8rem;
    width: 1000px;
    margin: 60px 0 40px;
    overflow: hidden;
}

.value-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-dark), var(--accent-blue));
    z-index: -1;
    opacity: .1;
}

.value-proposition {
    font-size: 18px;
    font-weight: 500;
    margin: 18px 0;
    color: #131313;
    line-height: 1.7;
    position: relative;
    z-index: 2;
    color: #fff;
}

.highlight {
    display: inline-block;
    padding: 0 15px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    color: white;
    border-radius: 16px;
    font-weight: 600;
    margin: 0 5px;
    /* box-shadow: 0 4px 12px rgba(21, 101, 192, 0.3); */
}

.features-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin: 20px 0 0;
    max-width: 1200px;
}

.feature-tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 20px;
    font-size: 1rem;
    /* color: #fff; */
    background-color: #fff;
    border-radius: 50px;
    text-decoration: none;
    border: none;
    position: relative;
    overflow: hidden;
    z-index: 1;
    transition: all 0.4s ease;
    box-shadow: 0 8px 25px rgba(0, 180, 216, 0.4);
    color: var(--accent-blue);
}

.feature-tag:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 25px rgba(21, 101, 192, 0.4);
}

.cta-section {
    margin-top: 30px;
}

.cta-btn {
    
    display: inline-block;
    background: linear-gradient(135deg, var(--accent), var(--secondary));
    color: #11172a;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    text-decoration: none;
    padding: 18px 50px;
    border-radius: 50px;
    font-size: 1.1rem;
    box-shadow: 0 0 25px rgba(0, 255, 202, 0.5);
    transition: all 0.4s ease;
    position: relative;
    z-index: 2;
    text-transform: uppercase;
    letter-spacing: 2px;
    border: none;
    overflow: hidden;
}

.cta-btn::after {
    /* content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, #c0392b, #e74c3c);
    opacity: 0;
    transition: opacity 0.4s ease; */
    
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent 0%,
            rgba(255, 255, 255, 0.3) 50%,
            transparent 100%);
    transform: translateX(-100%);
}
.cta-btn:hover {
    /* transform: translateY(-6px);
    box-shadow: 0 15px 35px rgba(199, 60, 43, 0.6); */
    
    transform: translateY(-5px);
    box-shadow: 0 0 40px rgba(0, 255, 202, 0.8);
}

.cta-btn:hover::after {
    /* opacity: 1; */
    transform: translateX(100%);
    transition: transform 0.6s ease;
}


.cta-btn i {
    margin-right: 15px;
    font-size: 24px;
    transition: transform 0.3s ease;
}

.cta-btn:hover i {
    transform: translateX(8px);
}
.cta-btn span{
    display: block;
    position: relative;
    z-index: 2;
}

/* 服务优势区域 */
.services-section {
    background: #f0f4fa;
}

.section-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 25px;
    color: var(--accent-blue);
}

.section-subtitle {
    font-size: 20px;
    color: #5f6368;
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
    line-height: 1.6;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.service-card {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: all 0.4s ease;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0, 60, 150, 0.25);
}


.service-features {
    list-style: none;
}

.service-features li {
    padding: 14px 0;
    position: relative;
    padding-left: 35px;
    border-bottom: 1px solid rgba(221, 221, 221, 0.5);
}

.service-features li::before {
    content: '\f00c';
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-size: 18px;
}

.service-features li:last-child {
    border-bottom: none;
}

/* 页脚区域 */
.footer {
    background: linear-gradient(135deg, var(--primary-dark), var(--accent-blue));
    color: rgba(255, 255, 255, 0.85);
}


.copyright {
    text-align: center;
    padding: 20px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.7);
    font-size: 15px;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .problem-title {
        font-size: 46px;
    }

    .problem-subtitle {
        font-size: 24px;
    }

    .section-title {
        font-size: 38px;
    }
}

@media (max-width: 992px) {
    .banner {
        height: auto;
        padding: 80px 0;
        min-height: auto;
    }

    .problem-title {
        font-size: 40px;
    }

    .problem-subtitle {
        font-size: 22px;
    }

    .nav-menu {
        gap: 25px;
    }
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 20px;
        padding-top: 20px;
        padding-bottom: 20px;
        height: auto;
    }

    .logo-wrapper {
        padding-top: 10px;
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }

    .problem-title {
        font-size: 34px;
    }

    .problem-subtitle {
        font-size: 20px;
    }

    .value-proposition {
        font-size: 19px;
    }

    .value-container {
        padding: 25px 30px;
    }

    .section-title {
        font-size: 32px;
    }

    .section-subtitle {
        font-size: 18px;
    }

    .feature-tag {
        padding: 12px 25px;
        font-size: 15px;
    }

    .cta-btn {
        padding: 16px 50px;
        font-size: 20px;
    }
}

@media (max-width: 576px) {
    .problem-title {
        font-size: 30px;
    }

    .value-proposition {
        font-size: 17px;
    }

    .feature-tag {
        padding: 10px 20px;
        font-size: 14px;
    }

    .cta-btn {
        padding: 14px 40px;
        font-size: 18px;
    }

    .section-title {
        font-size: 28px;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }
}