/* ========================================
   Mulsemedia 2026 Workshop Website
   Author: [gcfengxu]
   ======================================== */

:root {
    --primary-color: #2C3E50;
    --accent-color: #3498DB;
    --light-bg: #F8F9FA;
    --overlay-bg: rgba(229, 234, 240, 0.85);
    --nav-height: 70px;
    --content-width: 1300px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
font-family: 'Segoe UI', 'Roboto', sans-serif;
line-height: 1.6;
color: var(--primary-color);
overflow-x: hidden;
font-size: 20px;
background: #eef3f8;  /* 👈 统一淡灰蓝背景 */
}

/* ===== Header 优化 ===== */
.header {
    background: url('../figs/background.png') center/cover no-repeat;
    color: white;
    padding: min(6rem, 12vh) min(2rem, 5vw);
    text-align: center;
    position: relative;
    min-height: min(500px, 70vh);
    display: flex;
    justify-content: center;
    align-items: center;
    background-size: cover;
    background-position: center;
    margin-top: var(--nav-height);
    max-width: 100%;
    width: 100%;
    max-width: 100%;
    margin-top: var(--nav-height);
}

/* 半透明矩形框 */
.header::before {
content: '';
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: min(92%, var(--content-width));
height: min(75%, 550px);

/* 🔥 核心：渐变 + 透明 */
background: linear-gradient(
135deg,
rgba(44, 62, 80, 0.55),
rgba(52, 152, 219, 0.35)
);


border-radius: 16px;

box-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);

z-index: 1;
pointer-events: none;
}

.header-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    width: min(90%, 900px);
    padding: clamp(1rem, 4vw, 2rem);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-origin: center center; /* 确保从中心缩放 */
}


/* 内容不缩放，避免文字溢出 */
.header:hover .header-content {
    transform: none; /* 取消内容缩放 */
}

.header h1 {
font-size: clamp(2.2rem, 8vw, 3.8rem);
font-weight: 700;
margin-bottom: 1rem;
letter-spacing: 0.5px;

text-shadow: 0 3px 10px rgba(0,0,0,0.5);  /* 更柔 */
}

.header h2 {
font-size: clamp(1.2rem, 4vw, 1.7rem);
font-weight: 400;
margin-bottom: 0.8rem;
opacity: 0.95;
white-space: nowrap;
}

.header p {
font-size: clamp(1rem, 3vw, 1.2rem);
opacity: 0.85;
font-style: normal;   /* ❗去掉 italic（更正式） */
}
.aligned {
display: inline-grid;
grid-template-columns: auto 1fr;
column-gap: 0.4rem;
}

.aligned .label {
white-space: nowrap;
font-weight: 600;
}

.aligned .content {
display: block;
}
/* ===== 导航栏优化 ===== */
.nav-bar {
    backdrop-filter: blur(10px);
    background: rgba(248, 249, 250, 0.85);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--light-bg);
    height: var(--nav-height);
    border-bottom: 3px solid var(--accent-color);
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 5%;
}

.nav-container {
    width: 100%;
    max-width: 1300px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo-link {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo {
    height: clamp(35px, 5vh, 50px);
    width: auto;
    transition: height 0.3s ease;
}
.nav-container {
width: 100%;
max-width: 1200px;   /* 建议和 main 一致 */
margin: 0 auto;      /* 关键：整体居中 */
display: flex;
justify-content: space-between; /* 左右分布 */
align-items: center;
}
.nav-links {
display: flex;
gap: clamp(1.5rem, 4vw, 2.8rem);  /* 原来最大2rem → 提升 */
align-items: center;
}
.nav-link {
color: var(--primary-color);
text-decoration: none;
font-weight: 500;
font-size: clamp(0.9rem, 2vw, 1rem);
padding: 0.6rem 0.4rem;  /* 👈 增加上下空间 */
position: relative;
}

.nav-link:hover {
    color: #e74c3c;
}

/* ===== 主要内容区域 ===== */
.workshop-details {
    max-width: var(--content-width);
    width: 92%;
    margin: 2.5rem auto;
    padding: 0 1rem;
}

section {
margin-bottom: 2.5rem;
padding: 2rem;
background: #ffffff;   /* 👈 纯白卡片 */
border-radius: 14px;  /* 👈 稍微更圆 */
box-shadow: 0 6px 25px rgba(0,0,0,0.06);
transition: all 0.25s ease;
}
section:hover {
transform: translateY(-3px);
box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}
/* ===== 修复：每个section标题下的分割线 ===== */
h3 {
font-size: clamp(1.6rem, 4vw, 2.1rem);
font-weight: 600;
margin-bottom: 1.2rem;
color: var(--primary-color);
padding-bottom: 0.6rem;
padding-left: 1.2rem;
border-bottom: 2px solid rgba(52, 152, 219, 0.2);
}
h3 {
position: relative;
padding-left: 1.5rem;
}

p {
line-height: 1.75;
color: #34495e;
text-align: justify;
}
#call_for_paper {
border: 2px solid var(--accent-color);
background: linear-gradient(135deg, #f8fbff, #eef6ff);
}
#call_for_paper h3 {
color: #1f4e79;
}
body {
background: linear-gradient(to bottom, #ffffff, #f4f7fb);
}
h3::before {
content: '';
position: absolute;
left: 0;
top: 4px;
height: 75%;
width: 6px;             /* 👈 更宽 */
background: linear-gradient(180deg, #3498db, #5dade2); /* 👈 更高级 */
border-radius: 6px;     /* 👈 更圆润 */
}  
/* 使用伪元素创建分割线，这样更灵活 */
h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0px;  /* 分割线长度 */
    height: 3px;   /* 分割线粗细 */
    background: var(--accent-color); /* 使用主题色 */
    border-radius: 2px;
    transition: width 0.3s ease;
}
.organizer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.8rem;
}

/* ===== 布局 ===== */
.org-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

/* ===== 卡片（统一你网站风格） ===== */
.org-card {
    background: #ffffff;
    border-radius: 14px;
    padding: 1.6rem;
    border: 1px solid #e6ecf2;
    box-shadow: 0 6px 20px rgba(0,0,0,0.05);
    transition: all 0.25s ease;
}

.org-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(0,0,0,0.08);
}

/* ===== 标题 ===== */
.org-card h4 {
    font-size: 1.15rem;
    margin-bottom: 0.8rem;
    color: var(--primary-color);
    position: relative;
}

/* 小标题（Publication Chair） */
.sub-title {
    margin-top: 1.2rem;
}

/* ===== 列表 ===== */
.org-card ul {
    padding-left: 1.2rem;
}

.org-card li {
    margin-bottom: 0.6rem;
    line-height: 1.7;
    color: #34495e;
}

/* ===== 名字高亮（统一蓝色体系） ===== */
.name {
    font-weight: 600;
    color: var(--accent-color);  /* 👈 关键：用你的主题蓝 */
}

/* 学校 */
.affiliation {
    font-size: 0.95rem;
    margin-bottom: 0.3rem;
}

/* 职位 */
.title {
    font-size: 0.92rem;
    color: #5a6b7c;
    margin-bottom: 0.6rem;
}

/* 研究方向 */
.research {
    font-size: 0.92rem;
    color: #2c3e50;
    margin-top: 0.6rem;
}
.important-dates {
background: linear-gradient(135deg, #f8f9fa, #eef3f8);
padding: 1.5rem;
border-radius: 10px;
border-left: 4px solid var(--accent-color);
transition: all 0.25s ease;
}
.important-dates:hover {
box-shadow: 0 6px 20px rgba(0,0,0,0.08);
}
.topics-list {
    columns: 2;
    column-gap: 2rem;
    margin: 2rem 0;
}

ul, ol {
    padding-left: 1.5rem;
    margin: 1rem 0;
}

li {
margin-bottom: 0.7rem;
line-height: 1.6;
}
a {
color: var(--accent-color);
text-decoration: none;
border-bottom: 1px solid transparent;
transition: all 0.2s ease;
}
.speaker-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
gap: 1.8rem;
margin-top: 1.5rem;
}

.speaker-card {
background: #ffffff;
border-radius: 12px;
padding: 1.5rem;
border: 1px solid #e6ecf2;
transition: all 0.25s ease;
}

.speaker-card:hover {
transform: translateY(-4px);
box-shadow: 0 8px 25px rgba(0,0,0,0.08);
}

.speaker-card h4 {
font-size: 1.2rem;
margin-bottom: 0.3rem;
color: var(--primary-color);
}

.affiliation {
font-size: 0.95rem;
color: #6b7c93;
margin-bottom: 0.6rem;
}

.highlight {
font-size: 0.9rem;
color: #2c3e50;
font-weight: 500;
margin-bottom: 0.6rem;
}

.research {
font-size: 0.9rem;
margin-bottom: 0.6rem;
}

.bio {
font-size: 0.88rem;
color: #555;
}
a:hover {
border-bottom: 1px solid var(--accent-color);
}
/* ===== 响应式优化 ===== */
@media (max-width: 1024px) {
    .header {
        min-height: 400px;
        padding: 4rem 1.5rem;
    }
    
    .header::before {
        width: 85%;
        height: 65%;
    }
}

@media (max-width: 768px) {
    :root {
        --nav-height: 60px;
        --content-width: 1100px;
    }

    .nav-container {
        justify-content: flex-start;
    }

    .nav-links {
        position: static;
        transform: none;
        margin-left: auto;
        gap: 0.8rem;
        font-size: 0.9rem;
        white-space: normal;
    }

    .nav-link {
        padding: 0.3rem;
        font-size: 0.85rem;
    }

    .logo {
        height: 35px;
    }

    .header::before {
        width: min(92%, var(--content-width));
        height: 70%;
    }

    .topics-list {
        columns: 1;
    }

    .organizer-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }


    
    section:hover h3::after {
        width: 80px;
    }
}

@media (max-width: 480px) {
    .header {
        min-height: 300px;
        padding: 3rem 0.5rem;
    }
    
    .header::before {
        width: 95%;
        height: 75%;
    }

    .nav-links {
        gap: 0.5rem;
    }

    .nav-link {
        font-size: 0.75rem;
        padding: 0.2rem;
    }

    .workshop-details {
        width: 95%;
        padding: 0 0.5rem;
        max-width: var(--content-width);
    }
}
/* ===== Key Dates（顶会风格） ===== */

.key-dates {
    margin-top: 2.5rem;
}

/* 标题 */
.key-dates h4 {
    text-align: center;
    font-size: 1.4rem;
    font-weight: 600;
    color: #1f3a5f;
    margin-bottom: 1.2rem;
    position: relative;
}

/* 彩色下划线（核心视觉点） */
.key-dates h4::after {
    content: '';
    display: block;
    width: 50%;
    height: 5px;
    margin: 8px auto 0;
    background: linear-gradient(90deg, #3498db, #5dade2);
    border-radius: 2px;
}

/* 表格整体 */
.key-dates table {
    width: 100%;
    margin: 0 auto;
    border-collapse: collapse;
    background: #ffffff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 6px 25px rgba(0,0,0,0.05);
}

/* 行 */
.key-dates tr {
    transition: background 0.2s ease;
}

/* hover 效果（高级感） */
.key-dates tr:hover {
    background: #f4f8fc;
}

/* 单元格 */
.key-dates td {
    padding: 0.7rem 1.5rem;
    font-size: 1.05rem;
    border-bottom: 1px solid #eef2f6;
}

/* 左列 */
.key-dates td:first-child {
    text-align: left;
    color: #2c3e50;
    padding-left: 3rem
}

/* 右列（日期） */
.key-dates td:last-child {
    text-align: right;         /* ❗从 right 改为 left */
    padding-left: 2rem;       /* 👈 人为控制间距 */
    font-weight: 600;
    color: var(--accent-color);
    padding-right: 3rem
}

/* 去掉最后一行边框 */
.key-dates tr:last-child td {
    border-bottom: none;
}
/* ===== 工具类 ===== */
.text-center {
    text-align: center;
}

.mt-2 {
    margin-top: 1rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

#call_for_paper {
    scroll-margin-top: calc(var(--nav-height) + 20px);
}