/* 全局基础样式 */
:root {
    --sys-ft-color: #aaa;
    --sys-map-color: #666;
    --sys-bg-color: #000;
    --sys-hover-color: #eee;
    --sys-shader-color: rgba(255, 255, 255, 0.1);
    --sys-shader-hover-color: rgba(13, 110, 255, 0.1);
}
html,body{font-size: 14px;}
*{
    user-select: none;
}
body, a, a:hover {
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--sys-ft-color);
    background-color: var(--sys-bg-color);;
    text-decoration: none;
}

.main {
    padding-top: 80px;
    overflow: hidden;
}
.d-flex{
    margin-bottom: 0;
}
.navbar {
    box-shadow: 0 2px 10px var(--sys-shader-color);;;
}

.navbar-brand {
    font-weight: 700;
    color: var(--sys-hover-color) !important;
}

.nav-link {
    white-space: nowrap;
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0.2rem !important;
    margin: 0 0.2rem;
    border-radius: 0.375rem;
    transition: all 0.3s ease;
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(52, 152, 219, 0.1);
    color: var(--sys-hover-color) !important;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    background-color: var(--sys-hover-color);
    transition: all 0.3s ease;
}

.nav-link:hover::after {
    width: 70%;
    left: 15%;
}

.navbar-toggler {
    border: none;
    padding: 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
}

.dropdown-menu {
    border: none;
    box-shadow: 0 5px 15px var(--sys-shader-color);
}

.hero-section {
    padding: 7rem 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    text-align: center;
    margin-top: 56px;
}

.content-section {
    padding: 5rem 0;
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--sys-hover-color);
    margin-bottom: 1rem;
}
.max-width260{
    max-width: 260px;
}
.btn, .form-control, .form-control:focus {
    color: var(--sys-ft-color);
    border-color: var(--sys-shader-color);
}
p{
    margin-bottom: 0.25rem;
    line-height: 1.75;
}
.form-control:focus{
    box-shadow: 0 0 0 0.25rem var(--sys-shader-hover-color);
}
footer{
    margin-top: 20px;
    text-align: center;
    padding: 30px 0;
    border-top:1px solid var(--sys-shader-color);
}
.form-control:hover {
    color: var(--sys-hover-color);
    border-color: var(--sys-shader-color);
}

.parent {
    border: 1px solid var(--sys-shader-color);
    border-radius: 8px;
    margin: 10px 5px;
    overflow: hidden;
}
.title{
    font-size: 1.25rem;
}
.m-title{
    font-size: 1.35rem;
    font-weight: bold;
    color: var(--sys-hover-color);
    line-height: 3rem;
}
.m-title:before{
    content: "";
    width: 16px;
    background-color: var(--sys-shader-color);
    display: inline-block;
    height: 20px;
    margin-right: 12px;
    position: relative;
    top: 4px;

}
/* 核心代码：使用padding-top实现宽高比例 */
.aspect-box {
    width: 100%;
    padding-top: 70%; /* 这是关键：3/4 = 75% */
    background: var(--sys-bg-color);
    position: relative;
    border-radius: 6px;
    transition: background-color 0.3s;
}
.box-title{
    white-space: nowrap;
    overflow: hidden;
    text-align: center;
    line-height: 2;
    margin: 12px 12px;
}
/* 内部内容容器 */
.box {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    padding: 0;
    text-align: center;
    overflow: hidden;
}
.box img{
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}
.map{
    color: var(--sys-map-color);
}
.btn:hover{
    color: var(--sys-hover-color);
    background-color: var(--sys-bg-color);
    border-color: var(--sys-hover-color);
}
.navbar {
    background-color: var(--sys-bg-color);
}
@media (max-width: 991.98px) {
    .navbar-collapse {
        padding: 1rem;
        background-color: var(--sys-bg-color);
        border-radius: 0.5rem;
        box-shadow: 0 5px 15px var(--sys-shader-color);
        margin-top: 0.5rem;
    }

    .nav-link {
        margin: 0.2rem 0;
        padding: 0.8rem 1rem !important;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .book-info img {
        max-width: 150px;
    }

    .latest-chapters li span {
        display: none;
    }
}
@media (max-width: 576px) {
    .col-sm-6 {
        flex: 0 0 auto;
        width: 50%;
        padding-left: 3px;
        padding-right: 3px;
    }
    .parent{
        margin: 2px;
    }
}
/* 跑马灯容器 */
.marquee-container {
    width: 100%;
    overflow: hidden;
    position: relative;
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 10px 0;
    margin: 10px 0;
}

.marquee {
    display: flex;
    width: max-content;
    animation: marquee-scroll 30s linear infinite;
    padding: 5px 0;
}

.marquee:hover {
    animation-play-state: paused;
}

.marquee-item {
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    padding: 5px;
    margin: 0 5px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.marquee-item:hover {
    transform: translateY(-1px);
    font-weight: bold;
}

/* 跑马灯动画 */
@keyframes marquee-scroll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}