/* ========== 通用基础 ========== */
*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}
html,body{
    height:100%;
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
    color:#fff;
    background:#111;
}

/* ========== 首屏 ========== */
.bg-page{
    width:100%;
    height:100vh;
    background:url('../images/background.jpg') center/cover no-repeat;
    position:relative;
}
.overlay{
    position:absolute;
    top:0;left:0;
    width:100%;height:100px;
    background:rgba(0,0,0,.5);
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:0 30px;
}
.logo{
    width:80px;height:80px;
    object-fit:cover;
    border-radius:6px;
}
.top-nav a{
    margin-left:20px;
    color:#fff;
    font-size:18px;
    text-decoration:none;
}
.top-nav a:hover{
    text-decoration:underline;
}

/* ========== 底部：基岩小块平铺 ========== */
.footer{
    width:100%;
    background:url('../images/bedrock.jpg') repeat;
    padding:40px 0;
}
.footer-inner{
    max-width:1200px;
    margin:0 auto;
    display:flex;
    justify-content:space-between;
    align-items:flex-start;
    padding:0 20px;
}
.footer .col{
    flex:1;
}
.footer h3{
    font-size:18px;
    margin-bottom:10px;
    color:#fff;
}
.footer a{
    color:#fff;
    text-decoration:none;
}
.footer a:hover{
    text-decoration:underline;
}

/* ========== 响应式 ========== */
@media(max-width:600px){
    .footer-inner{
        flex-direction:column;
        align-items:center;
        text-align:center;
    }
    .footer .col{
        margin-bottom:20px;
    }
}

/* ========== 优势介绍页 ========== */
.features-page {
    width: 100%;
    min-height: auto;
    background: #111;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
}

.features-title {
    font-size: 2.2rem;
    margin-bottom: 40px;
    color: #fff;
    text-align: center;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.features-grid {
    max-width: 1200px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    text-align: center;
}

.feature-item {
    padding: 30px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-5px);
}

.feature-icon {
    width: 90px;
    height: 90px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
    position: relative;
}

.shield-icon {
    position: relative;
}

.shield-check {
    position: absolute !important;
    font-size: 1.2rem !important;
    color: #4CAF50 !important;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-item h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: #fff;
}

.feature-item p {
    color: #aaa;
    line-height: 1.6;
    font-size: 0.95rem;
}

/* ========== 赞助商页 ========== */
.sponsor-page {
    width: 100%;
    min-height: auto;
    background: #111;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
}

.sponsor-title {
    font-size: 2rem;
    margin-bottom: 30px;
    color: #fff;
    text-align: center;
}

.sponsor-link {
    display: inline-block;
    transition: transform 0.3s ease;
}

.sponsor-link:hover {
    transform: scale(1.05);
}

.sponsor-image {
    max-width: 500px;
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* ========== 导航锚点滚动 ========== */
html {
    scroll-behavior: smooth;
}

/* ========== 响应式调整 ========== */
@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .feature-item {
        padding: 25px 15px;
    }
    
    .sponsor-image {
        max-width: 90%;
    }
    
    .overlay {
        flex-wrap: wrap;
        height: auto;
        padding: 15px;
    }
    
    .top-nav a {
        margin-left: 10px;
        font-size: 16px;
    }
    
    .features-title {
        font-size: 1.8rem;
        margin-bottom: 30px;
    }
}