/* 毕业展2026 - 主样式文件 */
@import url("https://font.sec.miui.com/font/css?family=MiSans:100,200,400,700:Chinese_Simplify,Latin&display=swap");
/* 注意：由于已经通过@import引入了MiSans字体，以下@font-face规则可能是多余的 */
@font-face {
    font-family: "MiSans";
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}
/* --- RESET & VARIABLES --- */
:root {
    --bg-color: #121212;
    --text-main: #f0f0f0;
    --text-sub: #888888;
    --accent: #ffffff;
    --gap: 24px;
    --easing: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
ul, li { list-style: none; }
a { text-decoration: none; color: inherit; }

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: "MiSans", 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif; /* MiSans作为首选字体 */
    font-weight: 300;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    background-image: radial-gradient(circle at 50% 0%, #2a2a2a 0%, transparent 70%);
    min-height: 100vh;
}

/* --- HEADER --- */
header {
    position: fixed;
    top: 0; left: 0; width: 100%;
    padding: 25px 60px; /* 调整高度以适应双行导航 */
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    z-index: 100;
    background: linear-gradient(to bottom, rgba(18,18,18,0.98) 0%, rgba(18,18,18,0.9) 70%, rgba(18,18,18,0) 100%);
    pointer-events: none; 
}

.brand-block, .main-nav, .info-block { pointer-events: auto; }

/* 左侧 Logo */
.brand-block { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.brand-block a{display:inline-block;width:120px}
.brand-block a img{max-width:100%;height:auto;}
.logo-text { font-size: 32px; font-weight: 700; letter-spacing: 1px; line-height: 1; font-family: "MiSans", 'Helvetica Neue', sans-serif; }
.logo-sub { font-size: 12px; color: var(--text-sub); letter-spacing: 0.5px; }

/* --- NAVIGATION (双标题重构版) --- */
.main-nav {
    flex: 3; /* 增加宽度权重，给中间导航更多空间 */
    display: flex;
    justify-content: center;
    padding-top: 5px; 
}

.nav-list {
    display: flex;
    gap: 60px; /* 增加间距 */
}

.nav-item {
    position: relative;
    padding-bottom: 30px; /* 热区 */
    cursor: pointer;
    text-align: center;
    group-hover: text-decoration;
}

/* 导航按钮容器 */
.nav-btn-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    transition: opacity 0.3s;
}

/* 主标题样式 (焕新/集物...) */
.nav-main-title {
    font-size: 16px;
    font-weight: 500;
    color: #eee;
    letter-spacing: 1px;
    transition: color 0.3s var(--easing);
}

/* 副标题样式 (院系名称) */
.nav-sub-title {
    font-size: 12px;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0px;
    font-weight: 400;
    transition: color 0.3s var(--easing);
}

/* Hover 效果：主标题变亮，下划线 */
.nav-item:hover .nav-main-title { color: #fff; text-shadow: 0 0 10px rgba(255,255,255,0.3); }
.nav-item:hover .nav-sub-title { color: #999; }

.nav-item::after {
    content: '';
    position: absolute;
    bottom: 20px; /* 位于文字下方 */
    left: 50%;
    width: 0;
    height: 1px;
    background-color: var(--accent);
    transition: width 0.3s var(--easing), left 0.3s var(--easing);
}
.nav-item:hover::after { width: 40px; left: calc(50% - 20px); }

/* --- SUB MENU (字体放大版) --- */
.sub-menu {
    position: absolute;
    top: 55px;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    width: 180px; /* 稍微加宽 */
    background-color: rgba(20, 20, 20, 0.95);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.08);
    padding: 12px 0;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s var(--easing);
    box-shadow: 0 15px 40px rgba(0,0,0,0.6);
    border-radius: 2px;
}

.nav-item:hover .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.sub-menu li { display: block; }

.sub-menu a {
    display: block;
    padding: 12px 24px; /* 增加点击区域 */
    font-size: 14px; /* 字体放大 */
    font-weight: 400;
    color: #aaa;
    letter-spacing: 1px;
    transition: all 0.2s;
    text-align: center; /* 居中对齐更有仪式感 */
}

.sub-menu a:hover {
    color: #fff;
    background-color: rgba(255,255,255,0.08);
}

/* --- RIGHT INFO --- */
.info-block { flex: 1; text-align: right; display: flex; justify-content: flex-end; gap: 40px; width: 300px}
.info-block img{max-width:100%;height: auto;}
.dept-info { display: flex; flex-direction: column; justify-content: center; }
.dept-cn { font-size: 14px; font-weight: 500; }
.dept-en { font-size: 10px; color: var(--text-sub); text-transform: uppercase; }
.exhibit-title { border-left: 1px solid #444; padding-left: 20px; display: flex; flex-direction: column; }
.year { font-size: 16px; font-weight: 700; }
.main-title { font-size: 14px; font-weight: 700; text-transform: uppercase; line-height: 1.2; color: #dcdcdc; }

/* --- GALLERY GRID --- */
.container { max-width: 1600px; margin: 0 auto; padding: 200px 60px 100px; /* 顶部留白增加 */ }
.gallery-grid { column-count: 4; column-gap: var(--gap); }
.card { break-inside: avoid; margin-bottom: var(--gap); background: transparent; cursor: pointer; opacity: 0; transform: translateY(20px); animation: fadeIn var(--easing) 0.8s forwards; }
.image-wrapper { width: 100%; background-color: #1a1a1a; overflow: hidden; position: relative; border: 1px solid rgba(255,255,255,0.05); }
.card img { width: 100%; height: auto; display: block; filter: grayscale(100%) brightness(0.8); transition: filter 0.6s var(--easing), transform 0.6s var(--easing); }
.card:hover img { filter: grayscale(0%) brightness(1); transform: scale(1.03); }
.card-meta { padding-top: 12px; transition: opacity 0.4s var(--easing); }
.card-title { font-size: 16px; font-weight: 500; letter-spacing: 0.5px; margin-bottom: 6px; color: #e0e0e0; }
.card-author { font-size: 12px; color: #999; font-family: "MiSans", 'Courier New', monospace; letter-spacing: 1px; }

/* --- LOADER --- */
.loading-trigger { width: 100%; height: 100px; display: flex; justify-content: center; align-items: center; opacity: 0; transition: opacity 0.3s; }
.loading-trigger.active { opacity: 1; }
.dot { width: 4px; height: 4px; background-color: white; border-radius: 50%; margin: 0 4px; animation: pulse 1.4s infinite ease-in-out both; }
.dot:nth-child(1) { animation-delay: -0.32s; } .dot:nth-child(2) { animation-delay: -0.16s; }
@keyframes pulse { 0%, 80%, 100% { transform: scale(0); opacity: 0.3; } 40% { transform: scale(1); opacity: 1; } }
@keyframes fadeIn { to { opacity: 1; transform: translateY(0); } }

/* --- DETAIL PAGE STYLES --- */
.detail-container {
    display: flex;
    gap: 40px;
    max-width: 1600px;
    margin: 0 auto;
    padding: 120px 60px 100px;
}

/* 左侧信息区 */
.info-sidebar {
    flex: 0 0 350px;
    position: sticky;
    top: 140px;
    align-self: flex-start;
    height: calc(100vh - 160px);
    overflow-y: auto;
    padding-right: 20px;
}

.project-title {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 40px;
    letter-spacing: -0.5px;
}

.project-meta {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.meta-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.meta-item label {
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    color: #888;
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.meta-item .value {
    font-size: 14px;
    font-weight:400;
    color:#fff;
    line-height: 1.6;
}

.advisor-tag {
    display: inline-block;
    background-color: rgba(255,255,255,0.1);
    padding: 2px 8px;
    border-radius: 2px;
    font-size: 10px;
    margin-left: 8px;
    text-transform: uppercase;
}

.project-desc {
    font-size: 14px;
    line-height: 1.8;
    color: #ccc;
}

/* 右侧图片流 */
.image-stream {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.detail-img-wrapper {
    width: 100%;
    background-color: #1a1a1a;
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--easing), transform 0.8s var(--easing);
}

.detail-img-wrapper.visible {
    opacity: 1;
    transform: translateY(0);
}

.detail-img-wrapper img {
    width: 100%;
    height: auto;
    display: block;
}

.img-caption {
    margin-top: 12px;
    font-size: 12px;
    color: #888;
    font-family: "MiSans", 'Courier New', monospace;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.next-project {
    padding: 60px 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: 40px;
}

.next-label {
    font-size: 12px;
    color: #888;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.next-title {
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: color 0.3s;
}

.next-title:hover {
    color: #fff;
}

.wbp-cbm{
    border-top: 1px solid rgba(255, 255, 255, 0.1)!important;
    text-align: left!important;
}

/* --- RESPONSIVE --- */
@media (max-width: 1200px) {
    .gallery-grid { column-count: 3; }
    header { padding: 20px 30px; flex-wrap: wrap; }
    .info-block { display: none; }
    .main-nav { order: 3; width: 100%; padding-top: 20px; flex: auto; } /* 平板下导航换行 */
    .nav-list { width: 100%; justify-content: space-between; gap: 0; }
    
    /* 详情页响应式 */
    .detail-container {
        flex-direction: column;
        padding: 100px 30px 80px;
    }
    
    .info-sidebar {
        position: relative;
        top: 0;
        flex: none;
        height: auto;
        margin-bottom: 40px;
    }
}

@media (max-width: 768px) {
    .gallery-grid { column-count: 2; column-gap: 12px; }
    .main-nav { display: none; } /* 移动端需另外处理为汉堡菜单 */
    .logo-text { font-size: 24px; }
    .container { padding: 120px 20px 50px; }
    
    /* 详情页响应式 */
    .detail-container {
        padding: 80px 20px 60px;
    }
    
    .project-title {
        font-size: 24px;
    }
}