/* AiraXiv 统一样式系统 */
:root {
    /* 主色调 */
    --primary-color: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #e8f0fe;
    --primary-rgb: 26, 115, 232;
    
    /* 辅助色调 */
    --secondary-color: #f5871f;
    --secondary-dark: #d67300;
    --secondary-light: #fff3e0;
    --secondary-rgb: 245, 135, 31;
    
    /* 成功和警告色 */
    --success-color: #34a853;
    --success-light: #e6f4ea;
    --warning-color: #fbbc04;
    --warning-light: #fef7e0;
    --error-color: #ea4335;
    --error-light: #fce8e6;
    
    /* 中性色 */
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --text-tertiary: #9aa0a6;
    --border-color: #dadce0;
    --border-light: #e8eaed;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f4;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* 动画 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Submit to ICAIS 2025 高亮链接样式 */
.submit-to-icais2025-link {
    background: linear-gradient(135deg, #ff6b6b, #ee5a24) !important;
    color: white !important;
    padding: 8px 16px !important;
    border-radius: 20px !important;
    font-weight: 600 !important;
    text-decoration: none !important;
    box-shadow: 0 2px 8px rgba(255, 107, 107, 0.3) !important;
    transition: all 0.3s ease !important;
    animation: pulse-glow 2s infinite;
}

.submit-to-icais2025-link:hover {
    background: linear-gradient(135deg, #ee5a24, #ff6b6b) !important;
    transform: translateY(-2px) !important;
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.4) !important;
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 2px 8px rgba(255, 107, 107, 0.3);
    }
    50% {
        box-shadow: 0 2px 15px rgba(255, 107, 107, 0.5);
    }
}

/* Submit 导航链接样式 */
.submit-nav-link {
    background: linear-gradient(135deg, #1a73e8, #1557b0) !important;
    color: white !important;
    padding: 8px 16px !important;
    border-radius: 20px !important;
    font-weight: 600 !important;
    text-decoration: none !important;
    box-shadow: 0 2px 8px rgba(26, 115, 232, 0.3) !important;
    transition: all 0.3s ease !important;
}

.submit-nav-link:hover {
    background: linear-gradient(135deg, #1557b0, #1a73e8) !important;
    transform: translateY(-2px) !important;
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.4) !important;
}

/* ICAIS 2025 论文标记样式 */
.icais-paper {
    border-left: 4px solid #ff6b6b !important;
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.03), rgba(238, 90, 36, 0.02)) !important;
}

.paper-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.icais-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
    box-shadow: 0 2px 4px rgba(255, 107, 107, 0.3);
    animation: subtle-glow 3s ease-in-out infinite;
    flex-shrink: 0;
}

.icais-badge.accepted {
    background: linear-gradient(135deg, #28a745, #20c997);
    box-shadow: 0 2px 4px rgba(40, 167, 69, 0.3);
    animation: subtle-glow-green 3s ease-in-out infinite;
}

.icais-icon {
    font-size: 0.8rem;
}

.icais-text {
    letter-spacing: 0.5px;
}

@keyframes subtle-glow {
    0%, 100% {
        box-shadow: 0 2px 4px rgba(255, 107, 107, 0.3);
    }
    50% {
        box-shadow: 0 2px 8px rgba(255, 107, 107, 0.5);
    }
}

@keyframes subtle-glow-green {
    0%, 100% {
        box-shadow: 0 2px 4px rgba(40, 167, 69, 0.3);
    }
    50% {
        box-shadow: 0 2px 8px rgba(40, 167, 69, 0.5);
    }
}

/* 研究类型标记样式 */
.research-category-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    flex-shrink: 0;
}

.category-text {
    letter-spacing: 0.5px;
}

/* 不同研究类型的颜色 - 使用更柔和的色调，降低亮度 */
.research-category-survey {
    background: linear-gradient(135deg, #5a67d8, #7b5bb0);
}

.research-category-position {
    background: linear-gradient(135deg, #c878b2, #b85a7e);
}

.research-category-theoretical {
    background: linear-gradient(135deg, #4a8bb8, #3d7ba5);
}

.research-category-methodology {
    background: linear-gradient(135deg, #d67a9a, #d4a04a);
}

.research-category-empirical {
    background: linear-gradient(135deg, #3d9cad, #4a2d6d);
}

.research-category-application {
    background: linear-gradient(135deg, #3ca575, #2d9178);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .paper-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.3rem;
    }
    
    .icais-badge {
        align-self: flex-start;
    }
    
    .research-category-badge {
        align-self: flex-start;
    }
}

/* 基础重置 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* 容器 */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-wide {
    width: 95%;
    max-width: 1400px;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    border-bottom: 1px solid var(--border-light);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-md);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.logo {
    font-size: var(--font-size-2xl); /* 只对header中的logo设置固定大小 */
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: transform var(--transition-normal);
}

/* 但是对于logo内的span元素，让它们继承父元素的字体大小 */
.logo .logo-aira,
.logo .logo-xiv {
    font-size: inherit !important;
    font-weight: inherit !important;
    line-height: inherit !important;
}

.logo:hover {
    transform: scale(1.05);
}

.logo img {
    width: 24px;
    height: 24px;
    margin-right: 8px;
    vertical-align: middle;
    border-radius: var(--radius-sm);
    transition: transform var(--transition-normal);
}

.logo:hover img {
    transform: rotate(5deg);
}

.logo-aira {
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    /* Fallback for browsers that don't support background-clip */
}

/* Fallback for browsers that don't support background-clip */
@supports not (-webkit-background-clip: text) {
    .logo-aira {
        color: var(--primary-color) !important;
        background: none !important;
        -webkit-text-fill-color: var(--primary-color) !important;
    }
}

.logo-xiv {
    color: var(--secondary-color);
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    /* Fallback for browsers that don't support background-clip */
}

/* Fallback for browsers that don't support background-clip */
@supports not (-webkit-background-clip: text) {
    .logo-xiv {
        color: var(--secondary-color) !important;
        background: none !important;
        -webkit-text-fill-color: var(--secondary-color) !important;
    }
}

/* 确保在section-title中的logo颜色和字体大小正确显示 */
.section-title .logo-aira {
    color: var(--primary-color) !important;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)) !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    background-clip: text !important;
    font-size: inherit !important;
    font-weight: inherit !important;
}

.section-title .logo-xiv {
    color: var(--secondary-color) !important;
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark)) !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    background-clip: text !important;
    font-size: inherit !important;
    font-weight: inherit !important;
}

/* Section title中logo的fallback */
@supports not (-webkit-background-clip: text) {
    .section-title .logo-aira {
        color: var(--primary-color) !important;
        background: none !important;
        -webkit-text-fill-color: var(--primary-color) !important;
    }
    
    .section-title .logo-xiv {
        color: var(--secondary-color) !important;
        background: none !important;
        -webkit-text-fill-color: var(--secondary-color) !important;
    }
}

/* 通用规则：确保在所有上下文中的logo都能正确显示颜色并继承字体大小 */
.welcome-message .logo-aira,
.section-title .logo-aira,
p .logo-aira,
div .logo-aira,
span .logo-aira,
.logo-aira {
    color: var(--primary-color) !important;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)) !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    background-clip: text !important;
    font-size: inherit !important; /* 继承父元素字体大小 */
    font-weight: inherit !important; /* 继承父元素字体粗细 */
    line-height: inherit !important; /* 继承行高 */
}

.welcome-message .logo-xiv,
.section-title .logo-xiv,
p .logo-xiv,
div .logo-xiv,
span .logo-xiv,
.logo-xiv {
    color: var(--secondary-color) !important;
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark)) !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    background-clip: text !important;
    font-size: inherit !important; /* 继承父元素字体大小 */
    font-weight: inherit !important; /* 继承父元素字体粗细 */
    line-height: inherit !important; /* 继承行高 */
}

/* 通用fallback */
@supports not (-webkit-background-clip: text) {
    .welcome-message .logo-aira,
    .section-title .logo-aira,
    p .logo-aira,
    div .logo-aira,
    span .logo-aira,
    .logo-aira {
        color: var(--primary-color) !important;
        background: none !important;
        -webkit-text-fill-color: var(--primary-color) !important;
        font-size: inherit !important;
        font-weight: inherit !important;
        line-height: inherit !important;
    }
    
    .welcome-message .logo-xiv,
    .section-title .logo-xiv,
    p .logo-xiv,
    div .logo-xiv,
    span .logo-xiv,
    .logo-xiv {
        color: var(--secondary-color) !important;
        background: none !important;
        -webkit-text-fill-color: var(--secondary-color) !important;
        font-size: inherit !important;
        font-weight: inherit !important;
        line-height: inherit !important;
    }
}

/* 导航链接 */
.nav-links {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.nav-links a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(var(--primary-rgb), 0.1), transparent);
    transition: left var(--transition-slow);
}

.nav-links a:hover::before {
    left: 100%;
}

.nav-links a:hover {
    color: var(--primary-color);
    background-color: var(--primary-light);
    transform: translateY(-2px);
}

.nav-links a.active {
    color: var(--primary-color);
    background-color: var(--primary-light);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

/* 主要内容区域 */
.main-content {
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - 200px);
}

/* 标题样式 */
.section-title {
    font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-4xl));
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
    text-align: center;
    background: linear-gradient(135deg, var(--text-primary), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

/* 欢迎消息 */
.welcome-message {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--primary-light) 100%);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    border-left: 4px solid var(--primary-color);
}

.welcome-message::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(var(--primary-rgb), 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

.welcome-message p {
    margin-bottom: var(--spacing-md);
    position: relative;
    z-index: 1;
    font-size: var(--font-size-lg);
    line-height: 1.7;
}

.welcome-message p:first-child {
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
}

/* AI高亮 */
.ai-highlight {
    color: var(--primary-color);
    font-weight: 600;
    background: linear-gradient(120deg, rgba(var(--primary-rgb), 0.15) 0%, rgba(var(--primary-rgb), 0.05) 100%);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.ai-highlight::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left var(--transition-slow);
}

.ai-highlight:hover::before {
    left: 100%;
}

/* 搜索表单 */
.search-container {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    align-items: stretch;
    flex-wrap: wrap;
}

.search-form {
    display: flex;
    gap: var(--spacing-md);
    flex: 1;
    min-width: 300px;
}

.search-input {
    flex: 1;
    height: 56px;
    padding: 0 var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(var(--primary-rgb), 0.1);
    transform: translateY(-2px);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn:active {
    transform: translateY(-1px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark));
    color: white;
}

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--secondary-dark), var(--secondary-color));
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #2d8a47);
    color: white;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.search-button {
    height: 48px;
    padding: 0 24px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 15px;
    font-weight: 500;
    white-space: nowrap;
    min-width: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.search-button:hover {
    background-color: #1557b0;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.submit-button {
    height: 48px;
    padding: 0 24px;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    white-space: nowrap;
    min-width: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.submit-button:hover {
    background-color: #e67e1b;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.add-paper-button {
    height: 48px;
    padding: 0 24px;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 15px;
    font-weight: 500;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.add-paper-button:hover {
    background-color: #e67e1b;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Modal styles */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
}

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.close {
    color: var(--text-tertiary);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    border: none;
    background: none;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.close:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.modal-body {
    padding: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-weight: 500;
    font-size: var(--font-size-sm);
}

.form-group input[type="text"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: border-color 0.2s ease;
    background-color: white;
}

.form-group input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.1);
}

.help-text {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: var(--font-size-xs);
}

.form-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-xl);
}

.cancel-button {
    padding: 12px 24px;
    background-color: transparent;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.cancel-button:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

.submit-button {
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.submit-button:hover {
    background-color: var(--primary-dark);
}

.submit-button:disabled {
    background-color: var(--text-tertiary);
    cursor: not-allowed;
}

#loading-message {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

/* 论文列表 */
.paper-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.paper-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    will-change: transform; /* 优化GPU加速 */
}

.paper-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
    transform: scaleY(0);
    transition: transform var(--transition-normal);
}

.paper-item:hover::before {
    transform: scaleY(1);
}

.paper-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.paper-info {
    flex: 1;
    min-width: 0;
}

.paper-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.paper-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    flex-wrap: wrap;
}

.paper-pdf-link {
    /* 基础按钮样式 */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    /* 轮廓按钮样式 */
    background: transparent;
    color: var(--primary-color);
    /* Preview按钮特定样式 */
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.paper-pdf-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 徽章 */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.badge-success {
    background: var(--success-light);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.badge-warning {
    background: var(--warning-light);
    color: var(--warning-color);
    border: 1px solid var(--warning-color);
}

.badge-primary {
    background: var(--primary-light);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.accepted-badge {
    /* 基础徽章样式 */
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
    /* 成功徽章样式 */
    background: var(--success-light);
    color: var(--success-color);
}

/* 分页 */
.pagination-wrapper {
    margin: var(--spacing-2xl) 0;
}

.pagination-info {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-sm);
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.pagination a,
.pagination span {
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--primary-color);
    transition: all var(--transition-normal);
    min-width: 44px;
    text-align: center;
    font-weight: 500;
}

.pagination a:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.pagination .current {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-color: var(--primary-color);
    font-weight: 600;
}

/* 页面跳转 */
.page-jump {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
}

.jump-form {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.jump-form label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
}

.jump-input {
    width: 100px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    text-align: center;
    transition: all var(--transition-normal);
}

.jump-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.1);
}

.jump-button {
    /* 基础按钮样式 */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    /* 主按钮样式 */
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    /* Jump按钮特定样式 */
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.jump-button:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 空状态消息 */
.no-papers-message {
    text-align: center;
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    margin: var(--spacing-2xl) 0;
    box-shadow: var(--shadow-sm);
}

.no-papers-message p:first-child {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.no-papers-message p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

/* Spotlight 特殊样式 */
.spotlight-message {
    background: linear-gradient(135deg, #ffd700, #ffed4e, #ffd700);
    border: 2px solid #f1c40f;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin: var(--spacing-lg) 0;
    box-shadow: 0 8px 32px rgba(255, 215, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.spotlight-message::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.1'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.3;
}

.spotlight-message h2 {
    color: #b8860b;
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.spotlight-message p {
    color: #8b6914;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    position: relative;
    z-index: 1;
}

.spotlight-stats {
    background: rgba(255, 255, 255, 0.3);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-md);
    font-weight: 600;
    color: #7d5a00;
    position: relative;
    z-index: 1;
    backdrop-filter: blur(10px);
}

.spotlight-link {
    /* 基础按钮样式 */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    border: none;
    border-radius: 25px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
    /* Spotlight特定样式 */
    background: linear-gradient(135deg, #ffd700, #ffed4e, #ffd700);
    color: #b8860b;
    padding: var(--spacing-md) var(--spacing-lg);
}

.spotlight-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(255, 215, 0, 0.4);
    color: #8b6914;
}

/* 轨道卡片 */
.tracks-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr); /* 始终三列：AI / Human / arXiv */
    gap: var(--spacing-xl);
    margin: var(--spacing-2xl) 0;
}

.track-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-light);
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
    overflow: hidden;
}

.track-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.track-card:hover::before {
    transform: scaleX(1);
}

.track-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.track-card.ai-generated {
    border-left: 4px solid var(--primary-color);
}

.track-card.human-written {
    border-left: 4px solid #28a745;
}

.track-card.arxiv {
    border-left: 4px solid var(--secondary-color);
}

.track-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    display: block;
    transition: transform var(--transition-normal);
}

.track-card:hover .track-icon {
    transform: scale(1.1) rotate(5deg);
}

.track-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.track-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.track-features {
    list-style: none;
    margin: var(--spacing-lg) 0;
}

.track-features li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.track-features li::before {
    content: "✓";
    color: var(--primary-color);
    font-weight: bold;
    font-size: var(--font-size-lg);
}

.track-button {
    /* 基础按钮样式 */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    /* 主按钮样式 */
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    /* Track按钮特定样式 */
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
}

.track-button:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.track-button.arxiv {
    /* 辅助按钮样式 */
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark));
    color: white;
}

.track-button.arxiv:hover {
    background: linear-gradient(135deg, var(--secondary-dark), var(--secondary-color));
}

/* 表单样式 */
.submit-section {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.submit-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-light);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-base);
}

.form-control {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
    background: var(--bg-primary);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(var(--primary-rgb), 0.1);
    transform: translateY(-2px);
}

.file-input-wrapper {
    position: relative;
    margin-top: var(--spacing-sm);
}

.file-input-label {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
    width: 100%;
    font-weight: 500;
}

.file-input-label:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.file-input {
    position: absolute;
    left: -9999px;
}

.file-name {
    margin-left: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.help-text {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.error-text {
    display: none;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--error-color);
    font-weight: 500;
}

.error-text.show {
    display: block;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* 页脚 */
footer {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--border-light);
    margin-top: var(--spacing-2xl);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    list-style: none;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
}

.footer-links a {
    text-decoration: none;
    color: var(--text-secondary);
    transition: all var(--transition-normal);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.footer-links a:hover {
    color: var(--primary-color);
    background-color: var(--primary-light);
    transform: translateY(-2px);
}

.copyright {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .container {
        width: 95%;
        padding: 0 var(--spacing-md);
    }
    
    .tracks-container {
        grid-template-columns: repeat(2, 1fr); /* 平板两列 */
        gap: var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    .container {
        width: 98%;
        padding: 0 var(--spacing-sm);
    }
    
    .header-container {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .nav-links {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .search-container {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .search-form {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-md);
        min-width: auto;
    }
    
    .search-input {
        width: 100%;
        margin-bottom: var(--spacing-sm);
    }
    
    .search-button,
    .submit-button,
    .add-paper-button {
        width: 100%;
        justify-content: center;
    }
    
    .tracks-container {
        grid-template-columns: 1fr; /* 手机单列 */
        gap: var(--spacing-lg);
    }
    
    .title-row {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }
    
    .spotlight-link {
        align-self: center;
    }
    
    .paper-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .paper-pdf-link {
        align-self: flex-end;
    }
    
    .jump-form {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .jump-input {
        width: 120px;
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .welcome-message {
        padding: var(--spacing-lg);
    }
    
    .submit-container {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .nav-links {
        gap: var(--spacing-sm);
    }
    
    .nav-links a {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-sm);
    }
    
    .paper-item {
        padding: var(--spacing-md);
    }
    
    .pagination a {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-sm);
        min-width: 36px;
    }
    
    .logo {
        font-size: var(--font-size-xl);
    }
    
    /* 移除重复的logo图片尺寸定义，已在默认样式中统一设置 */
    /* .logo img {
        width: 24px;
        height: 24px;
    } */
}

/* 动画和过渡效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.fade-in-left {
    animation: fadeInLeft 0.6s ease-out;
}

.fade-in-right {
    animation: fadeInRight 0.6s ease-out;
}

/* 加载动画 */
.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-light);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
    transition: background var(--transition-normal);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* 选择文本样式 */
::selection {
    background: rgba(var(--primary-rgb), 0.2);
    color: var(--text-primary);
}

::-moz-selection {
    background: rgba(var(--primary-rgb), 0.2);
    color: var(--text-primary);
}

/* 焦点样式 */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 关键词和洞察提取样式 */

/* 共同的容器样式 */
.keyword-view, .insight-view {
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    margin-top: var(--spacing-md);
}

/* 为 insight-view 添加特殊样式 */
.insight-view {
    position: relative;
    overflow: visible; /* 允许灯泡图标显示在容器外 */
}

.keyword-view .section-header,
.insight-view .section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.keyword-view .section-title,
.insight-view .section-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
    background: none;
    -webkit-text-fill-color: var(--text-primary);
}

/* Preview layout: top row PDF(left) + Review(right) */
main.content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    min-height: 60vh;
}

main.content > .paper-view,
main.content > .review-view {
    min-height: 60vh;
}

@media (max-width: 1024px) {
    main.content {
        grid-template-columns: 1fr;
    }
    main.content > .paper-view,
    main.content > .review-view {
        min-height: 40vh;
    }
    
    .keyword-view {
        padding: var(--spacing-sm);
    }
}

@media (max-width: 768px) {
    .keyword-view .section-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: stretch;
    }
    
    .keyword-button {
        width: 100%;
        justify-content: center;
    }
    
    .keyword-content {
        min-height: 60px;
    }
    
    .keyword-tags {
        gap: var(--spacing-xs);
    }
    
    .keyword-tag {
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs);
    }
    
    .insight-item {
        padding: var(--spacing-sm);
        font-size: var(--font-size-sm);
    }
    
    .insight-item::before {
        width: 20px;
        height: 20px;
        font-size: 10px;
    }
}

@media (max-width: 480px) {
    .keyword-view {
        padding: var(--spacing-xs);
        margin-top: var(--spacing-sm);
    }
    
    .keyword-view .section-header {
        margin-bottom: var(--spacing-sm);
        padding-bottom: var(--spacing-xs);
    }
    
    .keyword-view .section-title {
        font-size: var(--font-size-base);
    }
}

.keyword-view:hover {
    box-shadow: var(--shadow-md);
}

.keyword-button {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.keyword-button:hover {
    background: var(--secondary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.keyword-button:disabled {
    background: var(--text-tertiary);
    cursor: not-allowed;
    transform: none;
}

/* 移除旧的嵌套框样式，新的直接展示样式 */
.keyword-content {
    width: 100%;
    min-height: 80px;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.no-keyword-message {
    color: var(--text-secondary);
    font-style: italic;
    text-align: center;
    padding: var(--spacing-xl) 0;
    font-size: var(--font-size-base);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 2px dashed var(--border-color);
}

/* Keywords 标签样式 - 紧凑的标签展示 */
.keyword-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.keyword-tag {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary-light), rgba(var(--primary-rgb), 0.1));
    color: var(--primary-color);
    border: 1px solid rgba(var(--primary-rgb), 0.3);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.keyword-tag:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* Insights 列表样式 - 更易读的条目展示 */
.insight-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.insight-item {
    position: relative;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
    border-left: 4px solid var(--secondary-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
}

.insight-item:hover {
    background: linear-gradient(135deg, var(--bg-primary), var(--secondary-light));
    border-left-color: var(--secondary-dark);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.insight-item::before {
    content: "💡";
    position: absolute;
    left: -12px;
    top: 50%;
    transform: translateY(-50%);
    background: white;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--secondary-color);
    z-index: 1;
}

/* 空状态样式 */
.no-insights {
    color: var(--text-secondary);
    font-style: italic;
    text-align: center;
    padding: var(--spacing-xl) 0;
    font-size: var(--font-size-base);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 2px dashed var(--border-color);
}

/* 旧的 keyword-result 样式已移除，现在使用新的直接展示样式 */

/* 友情链接样式 */
.friend-links {
    margin: var(--spacing-md) 0;
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.friend-links-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.friend-links-title::before {
    content: "🔗";
    font-size: 14px;
}

.friend-links-title::after {
    content: "";
    font-size: 14px;
}

.friend-links-list {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.friend-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 6px 12px;
    background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    min-width: 100px;
    justify-content: center;
    font-size: 14px;
}

.friend-link:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.friend-link-icon {
    font-size: 14px;
    line-height: 1;
    width: 16px;
    height: 16px;
    object-fit: contain;
}

.friend-link-text {
    font-size: 14px;
    font-weight: 600;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .friend-links-list {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .friend-link {
        width: 100%;
        max-width: 200px;
    }
}

/* 打印样式 */
@media print {
    header,
    footer,
    .nav-links,
    .search-container,
    .pagination,
    .friend-links {
        display: none;
    }
    
    .main-content {
        padding: 0;
    }
    
    .paper-item {
        break-inside: avoid;
        border: 1px solid #000;
    }
}

/* Sub-navigation tabs (Papers / ArXiv Review) */
.sub-nav-tabs {
    display: flex;
    gap: 0;
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-light);
}

.sub-nav-tab {
    padding: 10px 24px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s ease;
}

.sub-nav-tab:hover {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

.sub-nav-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    font-weight: 600;
}