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

:root {
    /* 学术会议专业配色方案 */
    --primary-color: #1e40af;
    --primary-light: #3b82f6;
    --primary-dark: #1e3a8a;
    --accent-color: #2563eb;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-light: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-secondary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Header Styles - 更专业的学术会议头部设计 */
.header-container {
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.85) 0%, rgba(37, 99, 235, 0.85) 100%);
    padding: 3rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 450px; /* 从320px增加到400px，让容器更高 */
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="1.5" fill="rgba(255,255,255,0.08)"/><circle cx="80" cy="40" r="1" fill="rgba(255,255,255,0.08)"/><circle cx="40" cy="80" r="0.8" fill="rgba(255,255,255,0.08)"/></svg>');
    animation: subtleFloat 25s ease-in-out infinite;
    opacity: 0.6;
}

@keyframes subtleFloat {
    0%, 100% { 
        transform: translateY(0px) translateX(0px);
        opacity: 0.6;
    }
    33% { 
        transform: translateY(-15px) translateX(10px);
        opacity: 0.7;
    }
    66% { 
        transform: translateY(10px) translateX(-10px);
        opacity: 0.5;
    }
}

.header-img {
    width: 1920px; /* 固定宽度，不受页面缩放影响 */
    height: auto; /* 保持图片原始宽高比 */
    min-height: 800px; /* 设置最小高度，确保显示足够的内容 */
    object-fit: cover;
    object-position: center -10%; /* 从顶部开始显示，避免上方被截断 */
    position: absolute;
    top: 50%; /* 居中定位 */
    left: 50%; /* 居中定位 */
    transform: translate(-50%, -50%); /* 通过transform居中 */
    z-index: 0;
    opacity: 0.3;
    transition: opacity 0.5s ease;
}

.header-container:hover .header-img {
    opacity: 0.35;
}

.header-text {
    position: relative;
    z-index: 2;
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    color: white;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    letter-spacing: -0.02em;
    animation: fadeInDown 0.8s ease-out;
}

.sub-text {
    font-size: clamp(1rem, 2.5vw, 1.4rem);
    margin-top: 1rem;
    font-weight: 400;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
    opacity: 0.95;
    line-height: 1.6;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 0.95;
        transform: translateY(0);
    }
}

/* .header-text {
    font-size: 3rem;
    font-weight: 700;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    letter-spacing: 2px;
    position: relative;
    z-index: 1;
} */

/* Navigation Styles - 更专业的导航栏设计 */
.navbar {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1.25rem 0;
    text-align: center;
    box-shadow: var(--shadow-md);
    position: static;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-link {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    margin: 0 0.4rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: 8px;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: var(--transition-smooth);
    transform: translateX(-50%);
}

.nav-link:hover::before,
.nav-link.active::before {
    width: calc(100% - 1.5rem);
}

.nav-link:hover {
    color: var(--accent-color);
    background: rgba(37, 99, 235, 0.05);
    transform: translateY(-1px);
}

.nav-link.active {
    color: var(--accent-color);
    background: rgba(37, 99, 235, 0.08);
    font-weight: 600;
}

/* Main Content - 更清晰的布局 */
.main-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 3rem 2.5rem;
    background: var(--bg-primary);
    border-radius: 16px;
    margin-top: 2.5rem;
    margin-bottom: 2.5rem;
    box-shadow: var(--shadow-lg);
    animation: contentFadeIn 0.6s ease-out;
}

@keyframes contentFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* .page-content {
    overflow: hidden;
    display: flex;
    gap: 2rem;
    align-items: flex-start;
} */

.page-content {
    overflow: hidden;
    animation: pageSlideIn 0.5s ease-out;
    transition: opacity 0.3s ease-in-out;
}

.page-content::after {
    content: "";
    display: table;
    clear: both;
}

@keyframes pageSlideIn {
    from {
        opacity: 0;
        transform: translateX(15px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}


.home {
  /* display: flex; */
  /* max-width: 1200px; */
  margin: 0 auto;
  padding: 20px;
  background-color: #f8f8f8;
  border: none;
  box-shadow: none;
}

.home-content {
    width: 100%;
    background-color: transparent;
    padding: 0;
    animation: fadeInUp 0.6s ease-out;
}

/* Welcome容器 - 左右布局 */
.welcome-container {
    display: flex;
    gap: 2rem;
    margin-bottom: 2.5rem;
    align-items: flex-start;
}

/* 重要日期侧边栏 - 左侧辅助信息 */
.important-dates-sidebar {
    flex: 0 0 320px;
    animation: fadeInRight 0.6s ease-out 0.2s both;
}

.important-dates-sidebar .sidebar {
    width: 100%;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--primary-color) 100%);
    opacity: 0.95;
    position: sticky;
    top: 100px;
}

.important-dates-sidebar .sidebar:hover {
    box-shadow: var(--shadow-md);
    opacity: 1;
}

.important-dates-sidebar .sidebar h4 {
    font-size: 0.9rem;
    margin-bottom: 0.6rem;
    color: white;
    border-bottom: 1px solid rgba(255, 255, 255, 0.25);
    padding-bottom: 0.4rem;
    font-weight: 500;
}

.important-dates-sidebar .sidebar > h4:first-child {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.important-dates-sidebar .sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0 0 1rem 0;
}

.important-dates-sidebar .sidebar li {
    padding: 0.35rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    transition: var(--transition-base);
    font-size: 0.85rem;
    line-height: 1.4;
}

.important-dates-sidebar .sidebar li:last-child {
    border-bottom: none;
}

.important-dates-sidebar .sidebar li:hover {
    padding-left: 0.3rem;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
}

.important-dates-sidebar .sidebar p {
    margin: 0;
    opacity: 0.95;
    font-size: 0.85rem;
}

.important-dates-sidebar .sidebar a {
    color: #ffd700;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-base);
}

.important-dates-sidebar .sidebar a:hover {
    color: white;
    text-shadow: 0 0 6px rgba(255, 215, 0, 0.4);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.header h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    color: var(--text-primary);
    margin-bottom: 2.5rem;
    text-align: center;
    position: relative;
    padding-bottom: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.header h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--primary-color));
    border-radius: 2px;
}

.welcome-message {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    padding: 2.5rem;
    border-radius: 12px;
    border-left: 4px solid var(--accent-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    flex: 1;
}

.welcome-message:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.welcome-text {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.welcome-text:last-child {
    margin-bottom: 0;
}

.topics-title {
    font-size: 2rem;
    color: var(--text-primary);
    text-align: center;
    margin: 2.5rem 0;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.topics-section {
    display: grid;
    gap: 2rem;
    margin-bottom: 2rem;
}

.topic-area {
    background: var(--bg-primary);
    padding: 2.25rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
}

.topic-area:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(37, 99, 235, 0.2);
}

.area-title {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: 1.75rem;
    font-weight: 600;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.75rem;
    letter-spacing: -0.01em;
}

.topic-area h4 {
    color: var(--accent-color);
    margin: 1.5rem 0 1rem 0;
    font-size: 1.2rem;
    font-weight: 600;
}

.topic-area ul {
    list-style: none;
    padding-left: 0;
}

.topic-area li {
    padding: 0.6rem 0;
    border-left: 3px solid transparent;
    padding-left: 1.25rem;
    margin-bottom: 0.4rem;
    transition: var(--transition-base);
    position: relative;
    color: var(--text-secondary);
}

.topic-area li::before {
    content: '▸';
    color: var(--accent-color);
    font-weight: 600;
    position: absolute;
    left: 0.25rem;
    font-size: 0.9em;
}

.topic-area li:hover {
    border-left-color: var(--accent-color);
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.08), transparent);
    transform: translateX(4px);
    color: var(--text-primary);
    padding-left: 1.5rem;
}

.area-text {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--primary-color) 100%);
    color: white;
    padding: 1.75rem;
    border-radius: 10px;
    margin-top: 1.75rem;
    font-weight: 500;
    line-height: 1.7;
    box-shadow: var(--shadow-md);
}

/* Sidebar Styles - 更专业的侧边栏设计 */
.sidebar {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--primary-color) 100%);
    color: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
}

.sidebar:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}

.sidebar h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: white;
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
    padding-bottom: 0.5rem;
}

.sidebar ul {
    list-style: none;
    padding: 0;
}

.sidebar li {
    padding: 0.8rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.sidebar li:hover {
    padding-left: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
}

.sidebar a {
    color: #ffd700;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.sidebar a:hover {
    color: white;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

.sidebar p {
    margin-bottom: 1rem;
    opacity: 0.9;
}

/* Committee Styles */
.committees-content {
    animation: fadeInUp 0.8s ease-out;
}

.committees-section {
    background: var(--bg-primary);
    padding: 2.25rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
}

.committees-section:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(37, 99, 235, 0.2);
}

.section-title {
    font-size: 1.4rem;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 1.25rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.75rem;
    letter-spacing: -0.01em;
}

.committees-section ul {
    list-style: none;
    padding: 0;
}

.committees-section li {
    padding: 0.8rem 0;
    border-bottom: 1px solid #f0f0f0;
    transition: all 0.3s ease;
    position: relative;
    padding-left: 2rem;
}

.committees-section li::before {
    content: '•';
    color: var(--accent-color);
    font-size: 1.2em;
    font-weight: bold;
    position: absolute;
    left: 0.5rem;
    top: 0.8rem;
}

.committees-section li:hover {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.1), transparent);
    transform: translateX(5px);
}

/* Submission Styles */
.submission-content {
    animation: fadeInUp 0.8s ease-out;
}

.submission-content p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
}

.submission-content ul {
    margin-bottom: 1.5rem;
}

.submission-content li {
    margin-bottom: 0.8rem;
    padding-left: 1rem;
    position: relative;
}

.submission-content li::before {
    content: '▸';
    color: var(--accent-color);
    font-weight: 600;
    position: absolute;
    left: 0;
    font-size: 0.9em;
}

.submission-content a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-base);
    border-bottom: 1px solid transparent;
}

.submission-content a:hover {
    color: var(--primary-color);
    border-bottom-color: var(--accent-color);
}

/* Journal Styles */
.Journals-container {
    animation: fadeInUp 0.8s ease-out;
}

.journal {
    background: var(--bg-primary);
    padding: 2.25rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
}

.journal:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(37, 99, 235, 0.2);
}

.journal h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.journal p {
    line-height: 1.7;
    color: var(--text-secondary);
}

/* Responsive Design - 优化移动端体验 */
@media (max-width: 1024px) {
    .welcome-container {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .important-dates-sidebar {
        flex: 1 1 100%;
        width: 100%;
    }
    
    .important-dates-sidebar .sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .main-content {
        margin: 1rem;
        padding: 1.5rem;
        border-radius: 12px;
    }
    
    .header-container {
        min-height: 350px; /* 从250px增加到300px，移动端也调高 */
        padding: 2rem 1rem;
    }
    
    .header-text {
        font-size: clamp(1.5rem, 6vw, 2.5rem);
    }
    
    .sub-text {
        font-size: clamp(0.9rem, 3vw, 1.2rem);
    }
    
    .navbar {
        padding: 1rem 0.5rem;
    }
    
    .nav-link {
        display: inline-block;
        padding: 0.6rem 1.2rem;
        margin: 0.3rem 0.2rem;
        font-size: 0.85rem;
    }
    
    .welcome-message {
        padding: 1.5rem;
    }
    
    .topic-area,
    .committees-section,
    .journal {
        padding: 1.5rem;
    }
    
    .sidebar {
        padding: 1.5rem;
    }
    
    .important-dates-sidebar .sidebar {
        padding: 1.2rem;
    }
    
    .important-dates-sidebar .sidebar h4 {
        font-size: 0.85rem;
    }
    
    .important-dates-sidebar .sidebar > h4:first-child {
        font-size: 0.95rem;
    }
    
    .welcome-message {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .nav-link {
        display: block;
        margin: 0.4rem 0;
        text-align: center;
    }
    
    .main-content {
        padding: 1rem;
    }
}

/* Loading Animation */
.loading {
    opacity: 0;
    animation: fadeIn 0.5s ease-out forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}


.site-footer{
  margin-top: 48px;
  padding: 18px 0;
  background: #fff;
  border-top: 1px solid rgba(0,0,0,0.06);
}

.site-footer .footer-inner{
  width: 1142px;          /* 你页面 viewport 固定 1142px，就保持一致 */
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: rgba(0,0,0,0.55);
}

.site-footer .footer-link{
  color: rgba(0,0,0,0.55);
  text-decoration: none;
}

.site-footer .footer-link:hover{
  color: rgba(0,0,0,0.85);
  text-decoration: underline;
}


.topbar{
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0 16px;
  background: rgba(0,0,0,0.03);
  font-size: 12px;
}

.topbar a{
  color: rgba(0,0,0,0.65);
  text-decoration: none;
}

.topbar a:hover{
  color: rgba(0,0,0,0.9);
  text-decoration: underline;
}