:root{
    /* meta-color */
    --pink: #F0A0B0;
    --mint: #B8E6D3;
    --cream: #FFF8DC;
    --white: #ffffff;
    --black: #1a1a1a;
    --soft-cream: #DDD6BA;
    --soft-white: #f8f8f8;
    --border-white: #e8e8e8;

    /* Day Theme: 背景粉+前景白 */
    --primary: var(--pink);
    --secondary: var(--mint);
    --accent: var(--cream);
    --text: var(--white);
    --border: var(--border-white);
    --shadow: rgba(255, 255, 255, 0.1);
    --px: 8px;
}

/* Dark Theme: 背景黑+前景粉 */
[data-theme="dark"] {
    --primary: var(--black);
    --secondary: var(--mint);
    --accent: var(--soft-cream);
    --text: var(--pink);
    --border: var(--pink);
    --shadow: rgba(240, 160, 176, 0.1);
}

/* Halloween Theme: 背景深紫+前景橙+南瓜色 */
[data-theme="halloween"] {
    --primary: #2a1835; /* 深紫色 */
    --secondary: #ff9800; /* 南瓜橙 */
    --accent: #ffb347; /* 浅南瓜 */
    --text: #fffbe6; /* 微黄白 */
    --border: #ff9800;
    --shadow: rgba(255, 152, 0, 0.15);
}



/* Fonts: Pixel for emphasis/titles, clean sans-serif for body text */
@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

/* Ensure pixel font loads properly */
@font-face {
    font-family: 'Press Start 2P';
    font-style: normal;
    font-weight: 400;
    src: url('https://fonts.gstatic.com/s/pressstart2p/v14/e3t4euO8T-267oIAQAu6jDQyK3nVivNm4I81.woff2') format('woff2');
    font-display: swap;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { 
    height: 100%; 
    width: 100%;
}

/* Text selection styling */
::selection {
    background: var(--secondary);
    color: var(--primary);
}
::-moz-selection {
    background: var(--secondary);
    color: var(--primary);
}

/* Link styling */
a {
    color: var(--secondary);
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    border-bottom: 1px solid transparent;
}
a:hover {
    color: var(--text);
    border-bottom-color: var(--accent);
    text-shadow: 0 0 8px var(--secondary);
}
a:active {
    transform: scale(0.98);
}

/* Special link styling for white text areas */
.content a, .item-desc a, .item-meta a {
    color: var(--accent);
    border-bottom: 1px dashed var(--accent);
}

body {
    background: var(--primary);
    color: var(--text);
    font-family: Roboto, 'Inter', system-ui, -apple-system, Segoe UI, Arial, sans-serif;
    letter-spacing: 0.02em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    transition: background-color 0.6s ease, color 0.6s ease;
}

/* Container: Sidebar + Main content, academic two-column layout */
.page {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px 80px; /* increased padding */
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 48px; /* increased gap */
    position: relative;
    z-index: 1;
    width: 100%; /* 确保容器不超过视口宽度 */
    box-sizing: border-box; /* 包含padding在宽度计算内 */
}

/* Top navigation */
.topbar {
    position: sticky;
    top: 0; z-index: 2;
    background: var(--primary);
    border-bottom: 2px solid var(--border);
    backdrop-filter: blur(8px);
    transition: background-color 0.6s ease, border-color 0.6s ease;
}
.topbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.brand {
    display: flex; align-items: center; gap: 12px;
    text-decoration: none; color: var(--text);
    transition: color 0.3s ease;
    border-bottom: none !important; /* 防止通用a样式的border-bottom影响 */
}
.brand:hover {
    color: var(--accent) !important;
    text-decoration: none !important;
    text-shadow: none !important;
    border-bottom: none !important;
    transform: none !important; /* 防止通用a样式的transform影响 */
}
.brand:hover .icon {
    color: var(--accent);
}

.brand-title { 
    font-family: 'Press Start 2P', 'Courier New', monospace; 
    font-size: 18px; 
    line-height: 1.2;
    font-weight: 400;
}
.nav {
    display: flex; flex-wrap: wrap; gap: 0;
}
.nav-btn{
    color: var(--text);
    text-decoration: none;
    font-family: 'Press Start 2P', 'Courier New', monospace;
    font-size: 12px;
    padding: 10px 20px;
    border: 2px solid var(--text);
    background: transparent;
    transition: all .6s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    font-weight: 400;
}
.nav-btn:not(:last-child) { border-right: none; }
.nav-btn:last-of-type { border-right: 2px solid var(--text); }
.nav-btn:hover, .nav-btn.active { 
    background: var(--text); 
    color: var(--primary);
}
.nav-btn:active {
    transform: none;
}

/* Theme switcher */
.theme-switcher {
    display: flex;
    align-items: center;
    margin-left: 12px;
}

.theme-btn {
    color: var(--text);
    background: transparent;
    border: 2px solid var(--text);
    padding: 8px;
    cursor: pointer;
    transition: all 0.6s ease;
    font-family: 'Press Start 2P', 'Courier New', monospace;
    font-size: 10px;
    position: relative;
    overflow: hidden;
}

.theme-btn:hover {
    background: var(--text);
    color: var(--primary);
    border-color: var(--text);
    transform: scale(1.05);
}

.theme-btn:hover .theme-icon {
    color: var(--primary);
}

.theme-btn .theme-icon {
    color: var(--text);
    transition: color 0.6s ease;
}

.theme-btn:active {
    transform: scale(0.95);
}

/* Theme animation effect */
.theme-btn::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--secondary) 0%, transparent 70%);
    opacity: 0;
    transform: scale(0);
    transition: all 0.5s ease;
    pointer-events: none;
}

.theme-btn.switching::before {
    opacity: 0.3;
    transform: scale(1);
}

/* Sidebar */
.sidebar{
    position: sticky; top: 80px;
    display: flex; flex-direction: column; gap: 20px;
    padding-bottom: 120px; /* 添加底部内边距避免与footer重合 */
}
.card{
    background: transparent;
    border: 2px solid var(--border);
    padding: 24px; /* increased padding */
    box-shadow: 0 4px 12px var(--shadow); /* subtle shadow */
    transition: all 0.6s ease;
}
.card:hover {
    box-shadow: 0 6px 20px var(--shadow);
}
.avatar {
    width: 120px; height: 120px;
    border: 4px solid var(--secondary);
    display: grid; place-items: center;
    margin: 0 auto 16px;
    background: transparent;
    transition: border-color 0.6s ease;
}
.name { 
    font-family: 'Press Start 2P', 'Courier New', monospace; 
    font-size: 20px; 
    text-align: center; 
    margin-bottom: 8px;
    font-weight: 400;
}
.title { 
    text-align: center; 
    font-size: 16px; 
    font-weight: 500;
}
.social-links{ 
    display: flex; 
    flex-direction: column; 
    gap: 10px; 
    margin-top: 16px; 
}
.social-btn{
    display: flex; 
    align-items: center; 
    gap: 12px;
    padding: 12px 16px; 
    text-decoration: none; 
    color: var(--text);
    background: transparent;
    border: 2px solid var(--text);
    font-family: 'Press Start 2P', 'Courier New', monospace;
    font-size: 10px;
    transition: all .6s ease;
    font-weight: 400;
}
.social-btn:hover { 
    background: var(--text); 
    color: var(--primary);
}

/* Disabled/Not Available styling */
.social-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    border-color: rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.6);
}
.social-btn.disabled:hover {
    background: transparent;
    color: rgba(255, 255, 255, 0.6);
    border-color: rgba(255, 255, 255, 0.3);
}

/* Main content area */
.main { 
    display: flex; 
    flex-direction: column; 
    gap: 20px;
    padding-bottom: 80px; /* Space for fixed footer */
}

/* Universal component animations */
.component {
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.2s ease, transform 0.2s ease, height 0.2s ease, background-color 0.6s ease, border-color 0.6s ease, color 0.6s ease;
}

.component.active {
    opacity: 1;
    transform: scale(1);
}

.component.fade-out {
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.2s ease, transform 0.2s ease;
}

/* Content update animations - 内容淡入淡出 */
.component.content-updating {
    position: relative;
}

/* 特殊组件样式 */
#article-toc-card {
    /* 确保 TOC 组件有正确的定位 */
    position: sticky;
    top: 80px;
    z-index: 15;
}
.section { 
    padding: 32px; /* increased padding */
    border: 2px solid var(--border); 
    background: transparent; 
    margin-bottom: 24px; /* positive margin for spacing */
    box-shadow: 0 2px 8px var(--shadow);
    transition: all 0.6s ease;
}
.section:hover {
    box-shadow: 0 4px 16px var(--shadow);
}

/* Accent sections with mint background */
.section-title { 
    font-family: 'Press Start 2P', 'Courier New', monospace; 
    font-size: clamp(16px, 5vw, 32px); /* 响应式字体：最小16px，最大32px */
    margin-bottom: 20px; 
    text-align: center;
    font-weight: 400;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    transition: all 0.6s ease;
}
.section-title .deco {
    display: inline-flex;
    align-items: center;
}
.section .content { 
    font-size: clamp(16px, 4vw, 21px); /* 响应式字体：最小16px，最大21px */
    line-height: clamp(24px, 5.5vw, 34.65px); /* 响应式行高 */
    font-weight: 450; 
    transition: all 0.6s ease;
}

/* Biography two-column grid */
.bio-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.sub-title { 
    font-family: 'Press Start 2P', 'Courier New', monospace; 
    font-size: clamp(12px, 3vw, 16px); /* 响应式字体：最小12px，最大16px */
    margin: 0 0 12px; 
    font-weight: 400; 
    text-align: left; 
    transition: all 0.6s ease;
}
.research-list { 
    list-style: square; 
    list-style-position: outside; 
    padding-left: 18px; 
    margin: 0; 
    font-size: clamp(12px, 3vw, 16px); /* 响应式字体：最小12px，最大16px */
    line-height: 1.6; 
    transition: all 0.6s ease;
}
.research-list li { margin: 6px 0; }

/* Responsive paragraph styling */
p {
    font-size: clamp(14px, 3.5vw, 18px); /* 响应式字体：最小14px，最大18px */
    line-height: clamp(20px, 5vw, 28px); /* 响应式行高 */
    margin-bottom: 16px;
    transition: all 0.6s ease;
}

/* Lists & Items */
.list{ 
    display: flex; 
    flex-direction: column; 
    gap: 16px; 
}

/* Fun page grid layout */
.fun-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.fun-item {
    aspect-ratio: 1;
    padding: 20px;
    border: 2px solid var(--border);
    background: transparent;
    transition: all .3s ease;
    box-shadow: 0 2px 6px var(--shadow);
    position: relative;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.fun-item:hover {
    border: 2px solid var(--accent);
    box-shadow: 0 4px 12px var(--shadow);
    color: var(--accent);
}

.fun-item .fun-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    opacity: 0.9;
}

.fun-item .fun-title {
    font-family: 'Press Start 2P', 'Courier New', monospace;
    font-size: 10px;
    line-height: 1.4;
    font-weight: 400;
}

.item{ 
    padding: 24px; /* increased padding */
    border: 2px solid var(--border); 
    background: transparent; 
    transition: all .3s ease; 
    box-shadow: 0 2px 6px var(--shadow);
    position: relative;
}
.item:hover{ 
    box-shadow: 0 4px 12px var(--shadow);
}

/* Publication expand/collapse functionality */

.item.publication .expand-indicator {
    position: absolute;
    top: 31px;
    right: 24px;
    width: 12px;
    height: 12px;
    opacity: 0;
    transition: all 0.3s ease;
    transform: rotate(0deg);
}

.item.publication:hover .expand-indicator {
    opacity: 1;
}

.item.publication.expanded .expand-indicator {
    transform: rotate(90deg);
    opacity: 1;
}

.item.publication .abstract {
    max-height: 0;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    margin-top: 0;
    opacity: 0;
    transform: translateY(-8px);
    padding-top: 0;
    padding-bottom: 0;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.item.publication.expanded .abstract {
    max-height: 300px;
    margin-top: 12px;
    margin-bottom: 12px;
    opacity: 1;
    transform: translateY(0);
    padding-top: 0;
    padding-bottom: 0;
    overflow-y: auto; /* 如果内容太长，允许垂直滚动 */
}
.item-title{ 
    font-family: 'Press Start 2P', 'Courier New', monospace;
    font-size: clamp(7px, 3vw, 12px); /* 更强的自适应：更小最小值，更大视口比例 */
    margin-bottom: 10px; 
    color: var(--text);
    font-weight: 400;
    transition: color 0.6s ease;
    line-height: 1.4;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Special styling for math in item titles */
.item-title .math {
    vertical-align: baseline;
    font-family: Roboto, 'Inter', system-ui, sans-serif;
    font-size: clamp(12px, 3vw, 16px); /* 自适应数学公式大小 */
    font-weight: 600;
    background: transparent;
    border: 1px dashed var(--accent);
    color: var(--accent);
    transition: color 0.6s ease, border-color 0.6s ease;
}

.item-title .katex {
    font-size: 14px !important;
    vertical-align: baseline !important;
    font-weight: 700 !important;
    color: var(--accent) !important;
    transition: color 0.6s ease !important;
}
.item-desc{ 
    font-size: 16px; 
    line-height: 1.6;
}
.item-meta {
    font-size: 14px;
    margin-top: 8px;
    opacity: 0.9;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Publication type indicators */
.pub-type {
    display: inline-block;
    width: 12px;
    height: 12px;
    margin-right: 6px;
    border-radius: 2px;
}

.pub-type.conference {
    background: #4A90E2; /* Blue for conference */
}

.pub-type.journal {
    background: #7B68EE; /* Purple for journal */
}

.pub-type.submitted {
    background: #FFDCA2; /* Orange for submitted */
}

.pub-type.arxiv {
    background: #8E8E93; /* Gray for arXiv */
}

/* Override link styles in meta for better contrast */
.item-meta a:hover {
    color: var(--secondary) !important;
    background: rgba(255, 255, 255, 0.1);
    text-decoration: none;
}

/* Education & Experience */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.timeline-item {
    border-left: 3px solid var(--text);
    padding-left: 16px;
    position: relative;
    transition: border-color 0.6s ease;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -5px;
    top: 0px; /* align dot with timeline-head */
    width: 7px;
    height: 7px;
    background: var(--text);
    transition: background-color 0.6s ease;
}
/* Put org and date on the same row */
.timeline-head { 
    display: flex; 
    align-items: center; 
    justify-content: space-between; 
    gap: 12px; 
    margin: 0 0 6px 0;
    line-height: 16px; /* ensure consistent height for dot alignment */
}
.timeline-head .timeline-org { margin: 0; }
.timeline-head .timeline-date { margin: 0; }
.timeline-title { 
    font-size: 16px; 
    margin: 0;
    transition: color 0.6s ease;
}
.timeline-org {
    font-family: 'Press Start 2P', 'Courier New', monospace;
    font-size: 12px;
    font-weight: 400;
    margin-bottom: 6px;
    transition: color 0.6s ease;
}
.timeline-date {
    font-size: 14px;
    opacity: 0.8;
    margin-bottom: 10px;
    transition: color 0.6s ease;
}
.timeline-desc {
    font-size: 16px;
    line-height: 1.6;
    transition: color 0.6s ease;
}

.footer { 
    bottom: 0;
    left: 0;
    right: 0;
    text-align: center; 
    padding: 20px; /* increased padding */
    font-family: monospace;
    font-size: 12px;
    background: transparent;
    border-top: 2px solid var(--border);
    z-index: 10;
    font-weight: 400;
    transition: border-color 0.6s ease;
}

/* Pixel SVG styles */
.icon { 
    width: 24px; 
    height: 24px; 
    color: var(--text); 
    display: inline-block;
    transition: color 0.6s ease, fill 0.6s ease;
}
.icon.large{ 
    width: 80px; 
    height: 80px; 
}
.icon.small {
    width: 16px;
    height: 16px;
}

/* SVG elements smooth transition */
svg, svg * {
    transition: fill 0.6s ease, stroke 0.6s ease;
}

/* Background pixel cats */
.bg-layer { 
    position: fixed; 
    inset: 0; 
    pointer-events: none; 
    z-index: 0; 
}
.cat-bg { 
    position: absolute; 
    opacity: .08; /* reduced opacity */
}
.cat-1{ top: 15%; left: 8%; animation: gentleFloat 12s ease-in-out infinite; }
.cat-2{ top: 35%; right: 12%; animation: gentleFloat 15s ease-in-out infinite 2s; }
.cat-3{ bottom: 40%; left: 15%; animation: gentleFloat 18s ease-in-out infinite 4s; }
.cat-4{ bottom: 20%; right: 8%; animation: gentleFloat 14s ease-in-out infinite 6s; }
@keyframes gentleFloat { 
    0%,100%{ transform: translateY(0) rotate(0deg); } 
    50%{ transform: translateY(-8px) rotate(1deg); } 
}

/* Subtle pixel grid background */
.bg-grid {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        repeating-linear-gradient(0deg, rgba(255,255,255,0.05) 0, rgba(255,255,255,0.05) 1px, transparent 1px, transparent var(--px)),
        repeating-linear-gradient(90deg, rgba(255,255,255,0.05) 0, rgba(255,255,255,0.05) 1px, transparent 1px, transparent var(--px));
}

/* Pixel decorative corners - L-shape style */
.section, .card { position: relative; }
.section::before, .card::before,
.section::after, .card::after {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--text);
    pointer-events: none;
    clip-path: polygon(0 0, 100% 0, 100% 4px, 4px 4px, 4px 100%, 0 100%);
    transition: background-color 0.6s ease;
}
.section::before, .card::before {
    top: -2px;
    left: -2px;
}
.section::after, .card::after {
    bottom: -2px;
    right: -2px;
    transform: rotate(180deg);
}

/* Accent sections get secondary color triangles */
.section.accent::before,
.section.accent::after {
    background: var(--secondary);
    transition: background-color 0.6s ease;
}

/* Pixel dividers */
.pixel-divider {
    height: 4px;
    margin: 20px 0;
    background: repeating-linear-gradient(
        to right,
        #ffffff 0px, #ffffff 4px,
        transparent 4px, transparent 8px,
        #B8E6D3 8px, #B8E6D3 12px,
        transparent 12px, transparent 16px
    );
    opacity: 0.6;
    transition: background 0.6s ease;
}

[data-theme="dark"] .pixel-divider {
    background: repeating-linear-gradient(
        to right,
        #F0A0B0 0px, #F0A0B0 4px,
        transparent 4px, transparent 8px,
        #B8E6D3 8px, #B8E6D3 12px,
        transparent 12px, transparent 16px
    );
}

/* Pixel badges */
.pixel-badge {
    display: inline-block;
    padding: clamp(2px, 1vw, 4px) clamp(4px, 2vw, 8px); /* 自适应 padding */
    background: var(--secondary);
    color: var(--primary);
    font-family: 'Press Start 2P', monospace;
    font-size: clamp(6px, 2vw, 8px); /* 自适应字体 */
    text-transform: uppercase;
    margin: 2px;
    clip-path: polygon(0 0, calc(100% - 4px) 0, 100% 4px, 100% 100%, 4px 100%, 0 calc(100% - 4px));
    transition: background-color 0.6s ease, color 0.6s ease;
    white-space: nowrap; /* 防止徽章内文字换行 */
}

/* Math rendering styling */
.math {
    display: inline-block;
    color: var(--accent);
    font-weight: 600;
    padding: 2px 6px;
    border: 1px var(--accent);
    background: transparent;
    transition: color 0.6s ease, border-color 0.6s ease;
}

.katex {
    color: var(--accent) !important;
    font-size: 0.95em !important;
    transition: color 0.6s ease !important;
}

.katex .base {
    color: var(--accent) !important;
    transition: color 0.6s ease !important;
}

.katex .mord, .katex .mop, .katex .mbin, .katex .mrel, .katex .mpunct {
    color: var(--accent) !important;
    transition: color 0.6s ease !important;
}

/* Make math expressions slightly less intrusive */
.katex-display {
    margin: 0.5em 0 !important;
}

/* Responsive */
@media (max-width: 980px){
    .page{ 
        grid-template-columns: 1fr; 
        gap: 20px;
        padding: 16px 16px 80px; /* 减少左右padding */
        max-width: 100vw; /* 确保不超过视口宽度 */
    }
    .sidebar{ 
        position: static; 
        order: -1;
    }
    .topbar-inner {
        padding: 12px 16px; /* 减少padding */
        gap: 12px;
    }
    .brand-title {
        font-size: 14px; /* 缩小字体 */
    }
    .nav {
        gap: 0;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch; /* iOS smooth scrolling */
    }
    .nav-btn {
        font-size: 9px;
        padding: 6px 12px;
        white-space: nowrap;
        flex-shrink: 0; /* 防止按钮收缩 */
    }
    .theme-btn {
        padding: 6px;
        font-size: 8px;
    }
    /* 确保所有section不会溢出 */
    .section, .card {
        max-width: 100%;
        overflow: visible; /* 改为 visible，避免不必要的滚动条 */
    }
    /* Biography grid becomes single-column on mobile */
    .bio-grid { grid-template-columns: 1fr; }
    
    /* Fun grid responsive */
    .fun-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    /* Publication 内容溢出修复 */
    .item.publication {
        overflow: visible;
    }
    .item-title {
        word-wrap: break-word;
        hyphens: auto;
        line-height: 1.5; /* 增加行高改善可读性 */
    }
    .item-desc, .abstract {
        word-wrap: break-word;
        hyphens: auto;
    }
}

@media (max-width: 600px){
    .page {
        padding: 12px 12px 80px; /* 更小的padding */
        max-width: 100vw;
        overflow-x: hidden; /* 防止水平溢出 */
    }
    .topbar-inner {
        padding: 8px 12px;
        gap: 8px;
        flex-wrap: nowrap; /* 确保不换行 */
    }
    .brand {
        gap: 8px;
    }
    .brand-title {
        font-size: 12px;
        line-height: 1.1;
    }
    .nav {
        max-width: calc(100vw - 120px); /* 限制导航栏最大宽度 */
    }
    .nav-btn {
        font-size: 8px;
        padding: 5px 10px;
        border-width: 1px; /* 更细的边框 */
    }
    .theme-btn {
        padding: 5px;
        border-width: 1px;
    }
    /* 确保内容不溢出 */
    .section, .card, .main {
        max-width: 100%;
        overflow: visible; /* 改为 visible */
        word-wrap: break-word;
    }
    .section {
        padding: 20px 16px; /* 减少section内部padding */
    }
    .card {
        padding: 16px; /* 减少card内部padding */
    }
    .fun-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .fun-item .fun-icon {
        width: 48px;
        height: 48px;
        margin-bottom: 12px;
    }
    
    .fun-item .fun-title {
        font-size: 9px;
    }
    
    /* 强制设置 section-title 在移动端的字体大小 */
    .section-title {
        font-size: 20px !important; /* 在中等屏幕上使用20px */
        gap: 16px;
        margin-bottom: 16px;
    }
    
    /* 强制设置 item-title 在移动端的字体大小 */
    .item-title {
        font-size: 8px !important;
        line-height: 1.3;
    }
    
    /* 中等屏幕下的文字自适应 */
    .sub-title {
        font-size: 12px !important;
    }
    .section .content {
        font-size: 16px !important;
        line-height: 24px !important;
    }
    p {
        font-size: 14px !important;
        line-height: 20px !important;
    }
    .research-list {
        font-size: 12px !important;
    }
    
    /* 移动端长文本处理 */
    .item-title {
        line-height: 1.6; /* 更大的行高 */
        word-break: break-word;
        overflow-wrap: break-word;
        /* 移除固定 font-size，让 clamp 生效 */
    }
    .item-desc, .abstract, .item-meta {
        font-size: clamp(12px, 3.5vw, 16px); /* 自适应字体 */
        line-height: 1.6;
        word-break: break-word;
        overflow-wrap: break-word;
    }
}

/* Extra small devices */
@media (max-width: 360px){
    .topbar-inner {
        padding: 6px 8px;
        gap: 6px;
    }
    .brand-title {
        font-size: 10px;
    }
    .nav {
        max-width: calc(100vw - 100px);
    }
    .nav-btn {
        font-size: 7px;
        padding: 4px 8px;
    }
    .theme-btn {
        padding: 4px;
    }
    .page {
        padding: 8px 8px 80px;
        max-width: 100vw;
    }
    .section {
        padding: 16px 12px;
    }
    .card {
        padding: 12px;
    }
    /* 极小屏幕下的文字优化 */
    .section-title {
        font-size: 16px !important; /* 在超小屏幕上使用16px */
        gap: 12px;
        margin-bottom: 12px;
    }
    .sub-title {
        font-size: 10px !important;
    }
    .section .content {
        font-size: 14px !important;
        line-height: 20px !important;
    }
    p {
        font-size: 12px !important;
        line-height: 18px !important;
    }
    .research-list {
        font-size: 10px !important;
    }
    .item-title {
        font-size: 7px !important; /* 在超小屏幕上更小 */
        line-height: 1.7; /* 更大行高避免拥挤 */
    }
    .item-title .math {
        font-size: clamp(10px, 4vw, 14px); /* 更小的数学公式 */
    }
}