/*============================基础样式============================*/   

html {
    font-size: 16px;
}
body {
    margin: 0;
    font-family: "Noto Serif SC", SimSun, "宋体", serif;
    padding-top: 60px;
    background-color: #112041;
    transition: padding-top 0.3s ease;
    font-size: 1rem;
}

/*============================加载动画============================*/
.loader-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #112041;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 40px;
    z-index: 9999;
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.loader {
    position: relative;
    width: 80px;
    height: 80px;
}

.loader-circle {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 4px solid transparent;
    animation: spin 3s linear infinite;
}

.loader-circle:nth-child(1) {
    border-top-color: #CA462F;
    animation-duration: 2s;
}

.loader-circle:nth-child(2) {
    border-top-color: #6287ac;
    animation-duration: 3s;
    animation-direction: reverse;
}

.loader-circle:nth-child(3) {
    border-top-color: #b0bbdc;
    animation-duration: 4s;
}

.loading-text {
    color: #b0bbdc;
    font-size: 1.2rem;
    font-weight: 300;
    letter-spacing: 2px;
    text-align: center;
    transition: all 0.5s ease;
}

.loader-dot {
    position: absolute;
    width: 12px;
    height: 12px;
    background-color: #CA462F;
    border-radius: 50%;
    top: -6px;
    left: 50%;
    transform: translateX(-50%);
}

/* 动画关键帧 */
@keyframes spin {
    0% { transform: rotate(0deg) scale(1); }
    50% { transform: rotate(180deg) scale(1.1); }
    100% { transform: rotate(360deg) scale(1); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}

.loader-container.hidden {
    opacity: 0;
    pointer-events: none;
}
/*============================导航============================*/
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(to bottom, #1E3B7A, #112041);
    z-index: 9998;
    transition: transform 0.3s ease;
    transform: translateY(0);
    display: flex;
    align-items: center;
}
.top-nav-content {
    width: 90%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-nav .logo a {
    color: #b0bbdc;
    font-size: 1.5rem;
    font-weight: bold;
}
.top-nav ul {
    list-style: none;
    display: flex;
    gap: 40px;
    margin: 0;
    padding: 0;
}
.top-nav a {
    color: #b0bbdc;
    text-decoration: none;
    font-size: 1.3rem;
    transition: color 0.3s ease;
}
.top-nav a:hover {
    color: #CA462F;
}

@media (max-width: 700px) {
    .top-nav ul {
        gap: 15px;
    }
}

/*============================备案============================*/
#epilogue {
    padding: 80px 15% 30px;
    display: flex;
}
.end{
    padding: 0 0 100px;
}

#back-to-top:hover {
    background-color: #ae4426;
}
.footer {
    padding: 150px 0 0;
    margin: 0 auto;
}
.beian {
    font-size: 1rem;
    text-align: center;
    margin: 0 auto;
    line-height: 1.6;
    text-decoration: none;
    color: #3b658e;
    transition: color 0.3s ease;
}
.beian:hover {
    color: #CA462F;
}




@media (max-width: 700px) {
    html {
        font-size: 12px; 
    }
}