/* 深邃蓝色科技风格主样式 */
body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', 'Microsoft YaHei', Arial, sans-serif;
    background: linear-gradient(135deg, #0a2342 0%, #274690 100%);
    color: #fff;
    min-height: 100vh;
}
.header {
    background: rgba(10, 35, 66, 0.95);
    box-shadow: 0 4px 24px 0 rgba(39,70,144,0.2);
    padding: 32px 0 16px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.header h1 {
    font-size: 2.8rem;
    margin: 0;
    letter-spacing: 2px;
    font-weight: 700;
    background: linear-gradient(90deg, #d4d6d8, #99a9c8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: fadeInDown 1s;
}
.header h2 {
    font-size: 1.3rem;
    font-weight: 400;
    margin: 12px 0 0 0;
    color: #b0c4de;
    letter-spacing: 1px;
    animation: fadeInDown 1.2s;
}
.nav {
    margin: 32px 0 0 0;
    display: flex;
    justify-content: center;
    gap: 40px;
    animation: fadeIn 1.5s;
}
.nav a {
    color: #fff;
    text-decoration: none;
    font-size: 1.1rem;
    padding: 8px 20px;
    border-radius: 20px;
    transition: background 0.3s, color 0.3s, box-shadow 0.3s;
}
.nav a:hover {
    background: #3a8dde;
    color: #fff;
    box-shadow: 0 2px 12px 0 #3a8dde55;
}
.hero {
    text-align: center;
    margin: 60px 0 40px 0;
    animation: fadeInUp 1.2s;
}
.hero-title {
    font-size: 2.2rem;
    font-weight: 600;
    margin-bottom: 18px;
    letter-spacing: 1px;
    color: #fff;
}
.hero-desc {
    font-size: 1.1rem;
    color: #b0c4de;
    margin-bottom: 30px;
}
.cta-btn {
    background: linear-gradient(90deg, #3a8dde, #1e3c72);
    color: #fff;
    border: none;
    border-radius: 24px;
    padding: 14px 38px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 16px 0 #3a8dde33;
    transition: background 0.3s, transform 0.2s;
    animation: fadeInUp 1.5s;
}
.cta-btn:hover {
    background: #1e3c72;
    transform: translateY(-3px) scale(1.04);
}
.section {
    max-width: 1100px;
    margin: 60px auto;
    background: rgba(10, 35, 66, 0.85);
    border-radius: 18px;
    box-shadow: 0 4px 32px 0 #1e3c7240;
    padding: 40px 36px;
    animation: fadeIn 2s;
}
.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 18px;
    color: #3a8dde;
}
.section-content {
    font-size: 1.05rem;
    color: #e0e6ed;
    line-height: 1.8;
}
.footer {
    text-align: center;
    color: #b0c4de;
    padding: 32px 0 18px 0;
    font-size: 1rem;
    background: rgba(10, 35, 66, 0.95);
    margin-top: 60px;
    letter-spacing: 1px;
    border-top: 1px solid #27469055;
    animation: fadeIn 2.2s;
}
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-40px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}