/* 改为蓝白色调的配色方案 */
        :root {
            --primary: #2563eb;
            --primary-light: #3b82f6;
            --primary-dark: #1d4ed8;
            --secondary: #60a5fa;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --text-dark: #1e293b;
            --text-muted: #64748b;
            --border-color: #e2e8f0;
        }

        /* 暗色主题变量 */
        [data-bs-theme="dark"] {
            --primary: #3b82f6;
            --primary-light: #60a5fa;
            --primary-dark: #2563eb;
            --secondary: #93c5fd;
            --bg-light: #0f172a;
            --bg-white: #1e293b;
            --text-dark: #f1f5f9;
            --text-muted: #94a3b8;
            --border-color: #334155;
        }

        * {
            margin: 0;
            padding: 1px;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
            background: var(--bg-light);
            color: var(--text-dark);
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* 为导航栏添加淡入动画 */
        .navbar {
            background: var(--bg-white) !important;
            box-shadow: 0 0 #0000, 0 0 #0000, 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            padding: 1rem 0;
            animation: slideDown 0.6s ease-out;
        }

        @keyframes slideDown {
            from {
                transform: translateY(-100%);
                opacity: 0;
            }
            to {
                transform: translateY(0);
                opacity: 1;
            }
        }

        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--text-dark) !important;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        /* 预留团队logo位置，支持替换图片 */
        .logo-placeholder {
            width: 40px;
            height: 40px;
            background: var(--primary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }

        .logo-placeholder img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .logo-text {
            font-weight: 700;
            color: white;
            font-size: 1.25rem;
        }

        .nav-link {
            color: var(--text-muted) !important;
            font-weight: 500;
            transition: color 0.3s;
            padding: 0.5rem 1rem !important;
        }

        .nav-link:hover {
            color: var(--primary) !important;
        }

        /* Hero Section 添加渐入和上浮动画 */
        .hero {
            padding: 8rem 0 5rem;
            background: linear-gradient(135deg, #dbeafe 0%, #f8fafc 100%);
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
            border-radius: 50%;
            animation: float 6s ease-in-out infinite;
        }

        @keyframes float {
            0%, 100% {
                transform: translate(0, 0);
            }
            50% {
                transform: translate(-30px, -30px);
            }
        }

        .hero-content {
            position: relative;
            z-index: 1;
            text-align: center;
        }

        .hero h1 {
            font-size: 4rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 1.5rem;
            animation: fadeInUp 0.8s ease-out 0.2s both;
        }

        .hero p {
            font-size: 1.25rem;
            color: var(--text-muted);
            max-width: 700px;
            margin: 0 auto 2.5rem;
            animation: fadeInUp 0.8s ease-out 0.4s both;
        }

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

        /* 将两个按钮横向排列，一左一右 */
        .hero-cta {
            display: flex;
            gap: 1.5rem;
            justify-content: center;
            align-items: center;
            animation: fadeInUp 0.8s ease-out 0.6s both;
        }

        .btn-primary-custom {
            background: var(--primary);
            color: white;
            padding: 0.875rem 2rem;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            border: none;
            position: relative;
            overflow: hidden;
        }

        /* 添加按钮波纹效果 */
        .btn-primary-custom::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.3);
            transform: translate(-50%, -50%);
            transition: width 0.6s, height 0.6s;
        }

        .btn-primary-custom:hover::before {
            width: 300px;
            height: 300px;
        }

        .btn-primary-custom:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 12px 30px rgba(37, 99, 235, 0.35);
            color: white;
        }

        .btn-outline-custom {
            background: transparent;
            color: var(--primary);
            padding: 0.875rem 2rem;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            border: 2px solid var(--primary);
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
        }

        /* 为轮廓按钮添加填充动画 */
        .btn-outline-custom::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: var(--primary);
            transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: -1;
        }

        .btn-outline-custom:hover::before {
            left: 0;
        }

        .btn-outline-custom:hover {
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 12px 30px rgba(37, 99, 235, 0.3);
        }

        /* 新增关于团队板块 */
        .about-section {
            padding: 5rem 0;
            background: var(--bg-white);
        }

        .about-content {
            display: flex;
            align-items: center;
            gap: 4rem;
        }

        .about-text h2 {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 1.5rem;
        }

        .about-text p {
            color: var(--text-muted);
            font-size: 1.1rem;
            margin-bottom: 1rem;
            line-height: 1.8;
        }

        .about-features {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
            margin-top: 2rem;
        }

        /* 为特性项添加滚动出现动画 */
        .feature-item {
            display: flex;
            align-items: start;
            gap: 1rem;
            opacity: 0;
            transform: translateX(-20px);
            transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .feature-item.visible {
            opacity: 1;
            transform: translateX(0);
        }

        .feature-icon {
            width: 40px;
            height: 40px;
            background: var(--primary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            flex-shrink: 0;
            transition: transform 0.3s ease;
        }

        .feature-item:hover .feature-icon {
            transform: rotate(10deg) scale(1.1);
        }

        .feature-text h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 0.25rem;
        }

        .feature-text p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin: 0;
        }

        /* Projects Section */
        .projects-section {
            padding: 5rem 0;
            background: var(--bg-light);
        }

        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            text-align: center;
            color: var(--text-dark);
            margin-bottom: 1rem;
        }

        .section-subtitle {
            text-align: center;
            color: var(--text-muted);
            margin-bottom: 3.5rem;
            font-size: 1.1rem;
        }

        /* 为项目卡片添加更流畅的悬停和出现动画 */
        .project-card {
            background: var(--bg-white);
            border-radius: 16px;
            padding: 2rem;
            height: 100%;
            border: 2px solid var(--border-color);
            transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            opacity: 0;
            transform: translateY(30px);
        }

        .project-card.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .project-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            border-radius: 16px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            opacity: 0;
            transition: opacity 0.5s ease;
            z-index: -1;
        }

        .project-card:hover {
            transform: translateY(-10px);
            border-color: transparent;
            box-shadow: 0 25px 50px rgba(37, 99, 235, 0.2);
        }

        .project-card:hover::before {
            opacity: 0.05;
        }

        /* 项目图标预留本地png路径 */
        .project-icon {
            width: 60px;
            height: 60px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            overflow: hidden;
            transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        .project-icon img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .project-icon i {
            font-size: 1.75rem;
            color: white;
        }

        .project-title {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--text-dark);
        }

        .project-desc {
            color: var(--text-muted);
            margin-bottom: 1.5rem;
            line-height: 1.7;
        }

        .project-btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0.75rem 2rem;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            text-decoration: none;
            display: inline-block;
            position: relative;
            overflow: hidden;
        }

        /* 为项目按钮添加滑动效果 */
        .project-btn::after {
            content: '→';
            position: absolute;
            right: 1.5rem;
            transition: transform 0.3s ease;
        }

        .project-btn:hover::after {
            transform: translateX(5px);
        }

        .project-btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(37, 99, 235, 0.35);
            color: white;
        }

        /* 团队成员改为只显示两人 */
        .team-section {
            padding: 5rem 0;
            background: var(--bg-white);
        }

        /* 团队卡片添加更优雅的动画 */
        .team-card {
            background: var(--bg-light);
            border: 2px solid var(--border-color);
            border-radius: 16px;
            padding: 2.5rem;
            text-align: center;
            transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            height: 100%;
            opacity: 0;
            transform: scale(0.9);
        }

        .team-card.visible {
            opacity: 1;
            transform: scale(1);
        }

        .team-card:hover {
            border-color: var(--primary);
            transform: translateY(-8px) scale(1.02);
            box-shadow: 0 20px 40px rgba(37, 99, 235, 0.15);
        }

        .team-avatar {
            width: 120px;
            height: 120px;
            border-radius: 50%;
            margin: 0 auto 1.5rem;
            border: 4px solid var(--primary);
            object-fit: cover;
            transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .team-card:hover .team-avatar {
            transform: scale(1.1);
        }

        .team-name {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 0.5rem;
        }

        .team-role {
            color: var(--primary);
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }

        .team-bio {
            color: var(--text-muted);
            font-size: 1rem;
            margin-bottom: 1.5rem;
            line-height: 1.6;
        }

        /* 联系方式使用邮箱和QQ图标，支持点击跳转 */
        .contact-links {
            display: flex;
            gap: 1rem;
            justify-content: center;
        }

        /* 为联系链接添加弹跳动画 */
        .contact-link {
            width: 50px;
            height: 50px;
            background: var(--bg-white);
            border: 2px solid var(--border-color);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            text-decoration: none;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            font-size: 1.25rem;
        }

        .contact-link:hover {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
            transform: translateY(-5px) scale(1.1);
            box-shadow: 0 10px 20px rgba(37, 99, 235, 0.3);
        }

        /* Stats Section */
        .stats-section {
            padding: 4rem 0;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            color: white;
        }

        .stat-item {
            text-align: center;
            padding: 1.5rem;
        }

        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: white;
            display: block;
        }

        .stat-label {
            color: rgba(255, 255, 255, 0.9);
            font-size: 1rem;
            margin-top: 0.5rem;
        }

        /* 将技术栈改为服务优势板块 */
        .services-section {
            padding: 5rem 0;
            background: var(--bg-light);
        }



        .news-grid {
            display: flex;
            flex-direction: column;
            gap: 0.85rem;
            margin: 0 auto;
        }

        .news-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 14px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            overflow: hidden;
        }

        .news-row-link {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 1rem 1.25rem;
            text-decoration: none;
            color: inherit;
        }

        .news-row-link:hover {
            background: rgba(37, 99, 235, 0.04);
        }

        .news-badge {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            border-radius: 999px;
            background: var(--primary);
            color: white;
            font-size: 0.85rem;
            font-weight: 600;
        }

        .news-type-notice .news-badge { background: #2563eb; }
        .news-type-activity .news-badge { background: #16a34a; }
        .news-type-match .news-badge { background: #ea580c; }
        .news-type-security .news-badge { background: #dc2626; }

        .news-time {
            color: var(--text-muted);
            font-size: 0.85rem;
            flex-shrink: 0;
        }

        .news-title {
            flex: 1;
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-dark);
            margin: 0;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            color: var(--text-muted);
            padding: 2rem 1rem;
            background: var(--bg-white);
            border-radius: 14px;
            border: 1px dashed var(--border-color);
        }

        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .service-item {
            background: var(--bg-white);
            padding: 2.5rem 2rem;
            border-radius: 12px;
            text-align: center;
            border: 2px solid var(--border-color);
            transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            opacity: 0;
            transform: translateY(20px);
        }

        .service-item.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .service-item:hover {
            border-color: var(--primary);
            transform: translateY(-8px);
            box-shadow: 0 15px 35px rgba(37, 99, 235, 0.15);
        }

        .service-item i {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 1.5rem;
            display: block;
            transition: transform 0.4s ease;
        }

        .service-item:hover i {
            transform: scale(1.15) rotate(5deg);
        }

        .service-item h4 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 0.75rem;
        }

        .service-item p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.6;
            margin: 0;
        }

        /* 缩小联系我们板块 */
        .contact-section {
            padding: 4rem 0;
            background: var(--bg-white);
        }

        .contact-box {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            border-radius: 20px;
            padding: 3rem 2rem;
            text-align: center;
            color: white;
            max-width: 900px;
            margin: 0 auto;
        }

        .contact-box h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.75rem;
        }

        .contact-box p {
            font-size: 1rem;
            margin-bottom: 2rem;
            opacity: 0.95;
        }

        .contact-methods {
            display: flex;
            gap: 1.5rem;
            justify-content: center;
            flex-wrap: wrap;
        }

        .contact-method {
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(10px);
            padding: 1.25rem 1.5rem;
            border-radius: 12px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            min-width: 180px;
        }

        .contact-method:hover {
            background: rgba(255, 255, 255, 0.25);
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }

        .contact-method i {
            font-size: 1.75rem;
            display: block;
            margin-bottom: 0.5rem;
        }

        .contact-method h4 {
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 0.25rem;
        }

        .contact-method p {
            font-size: 0.85rem;
            margin: 0;
            opacity: 0.9;
        }

        /* Footer */
        footer {
            margin-top: auto;
            padding: 3rem 1rem;
            background: var(--text-dark);
            color: white;
            text-align: center;
        }

        footer .container {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100%;
        }

        footer p {
            margin: 0;
            opacity: 0.8;
            line-height: 1.8;
            word-break: break-word;
        }

        /* Responsive */
        @media (max-width: 992px) {
            .about-content {
                flex-direction: column;
            }

            .about-features {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }

            .section-title {
                font-size: 2rem;
            }

            /* 移动端保持按钮横向排列 */
            .hero-cta {
                flex-direction: row;
                gap: 1rem;
            }

            .btn-primary-custom, .btn-outline-custom {
                padding: 0.75rem 1.5rem;
                font-size: 0.9rem;
            }

            .contact-methods {
                flex-direction: column;
            }

            footer {
                padding: 2rem 1rem;
            }

            footer p {
                font-size: 0.9rem;
            }
        }
        .btn-primary-custom:focus {
            transform: none !important;
            box-shadow: none !important;
        }

        @media (max-width: 480px) {
            footer {
                padding: 1.5rem 0.75rem;
            }

            footer p {
                font-size: 0.85rem;
            }
        }

/* ===== Shop Cards ===== */
.shop-card {
    text-align: center;
}

.shop-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.shop-price {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

/* ===== Leaderboard Table ===== */
.leaderboard-table,
.violations-table {
    max-width: 960px;
    margin: 0 auto;
    overflow-x: auto;
}

.leaderboard-table table,
.violations-table table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.leaderboard-table thead,
.violations-table thead {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
}

.leaderboard-table th,
.violations-table th {
    padding: 1rem 1.25rem;
    font-weight: 600;
    font-size: 0.9rem;
    text-align: left;
}

.leaderboard-table td,
.violations-table td {
    padding: 0.85rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-dark);
}

.leaderboard-table tbody tr:last-child td,
.violations-table tbody tr:last-child td {
    border-bottom: none;
}

.leaderboard-table tbody tr:hover,
.violations-table tbody tr:hover {
    background: #f0f7ff;
}

.rank-gold td {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.06) 0%, transparent 100%);
    font-weight: 600;
}

.rank-gold td:first-child {
    color: var(--primary);
    font-weight: 800;
    font-size: 1.1rem;
}

.rank-gold .bi-trophy-fill {
    color: var(--primary);
    margin-right: 0.35rem;
}

/* ===== Violations Table ===== */
.violations-table {
    margin-top: 2rem;
}

.violations-table table {
    background: rgba(255, 255, 255, 0.95);
}

.ban-permanent td {
    color: #dc2626;
}

.ban-permanent td:nth-child(3) {
    font-weight: 700;
    color: #dc2626;
}

.ban-temp td:nth-child(3) {
    font-weight: 600;
    color: #f59e0b;
}

#violations .section-title,
#violations .section-subtitle {
    position: relative;
    z-index: 1;
}

#violations {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 5rem 0;
}

/* ===== Nav Auth Buttons ===== */
.nav-auth {
    display: flex;
    gap: 0.5rem;
    margin-left: 1.5rem;
    align-items: center;
}

/* 语言切换器样式 */
.lang-switcher {
    position: relative;
    margin-right: 0.5rem;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.6rem;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    background: transparent;
    color: #64748b;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.lang-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: #f8fafc;
}

.lang-btn i {
    font-size: 1rem;
}

.lang-current {
    font-weight: 600;
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    padding: 0.5rem;
    min-width: 140px;
    display: none;
    z-index: 1000;
}

.lang-dropdown.show {
    display: block;
    animation: fadeInDown 0.2s ease;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: none;
    background: transparent;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.875rem;
}

.lang-option:hover {
    background: #f1f5f9;
}

.lang-option.active {
    background: #dbeafe;
    color: var(--primary);
    font-weight: 600;
}

.lang-flag {
    font-size: 1.1rem;
}

.lang-name {
    flex: 1;
    text-align: left;
}

.btn-auth {
    padding: 0.4rem 1.1rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    white-space: nowrap;
}

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

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

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

.btn-register:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: white;
}

/* ===== User Avatar Dropdown ===== */
.user-avatar-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.user-avatar:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.user-info-display {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.user-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
    line-height: 1.2;
}

.user-cf {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.2;
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--bg-white);
    border-radius: 10px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    border: 2px solid var(--border-color);
    min-width: 160px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.user-avatar-wrapper:hover .user-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    color: var(--text-dark);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.dropdown-item:first-child {
    border-radius: 8px 8px 0 0;
}

.dropdown-item:last-child {
    border-radius: 0 0 8px 8px;
}

.dropdown-item:hover {
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary);
}

.dropdown-item i {
    font-size: 1rem;
}

@media (max-width: 992px) {
    .nav-auth {
        margin-left: 0;
        margin-top: 0.75rem;
        justify-content: center;
    }

    .user-dropdown {
        right: 50%;
        transform: translateX(50%) translateY(-10px);
    }

    .user-avatar-wrapper:hover .user-dropdown {
        transform: translateX(50%) translateY(0);
    }
}

/* 导航栏 container 优化 - 覆盖全局 container 的 padding */
.navbar > .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem !important;
}

/* 移动端导航栏优化 - 增加左右间距 */
@media (max-width: 768px) {
    .navbar {
        padding: 0.75rem 0;
    }

    .navbar > .container {
        padding-left: 1rem !important;
        padding-right: 1rem !important;
    }

    .navbar-brand {
        margin-left: 0.5rem;
    }

    .navbar-toggler {
        margin-right: 0.5rem;
        padding: 0.5rem 0.75rem;
    }

    #navbarNav {
        padding: 1rem 0.5rem;
    }

    .navbar-nav {
        padding-left: 0.5rem;
        padding-right: 0.5rem;
    }

    .nav-link {
        padding: 0.75rem 1rem !important;
    }
}

/* 更小屏幕的进一步优化 */
@media (max-width: 576px) {
    .navbar > .container {
        padding-left: 0.75rem !important;
        padding-right: 0.75rem !important;
    }

    .navbar-brand img {
        height: 32px !important;
        width: auto !important;
    }

    .navbar-brand {
        margin-left: 0.25rem;
    }

    .navbar-toggler {
        margin-right: 0.25rem;
        padding: 0.4rem 0.6rem;
    }
}

/* 彩色正方形动画效果 - 备份 */
/*
.flying-squares-container {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    top: 17%;
    left: 0;
}

.square-box {
    position: absolute;
    border-radius: 0;
    background: rgba(255, 255, 255, 0.4);
    border: 1.5px solid;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    animation: fly-burst 10s linear infinite;
}

@keyframes fly-burst {
    0% {
        transform: translate(0, 0) rotate(0deg) scale(1);
        opacity: 1;
    }
    70% {
        opacity: 1;
    }
    85% {
        transform: translate(180px, -120px) rotate(180deg) scale(1.1);
        opacity: 0.5;
    }
    90% {
        transform: translate(200px, -150px) rotate(270deg) scale(0.8);
        opacity: 0.2;
    }
    100% {
        transform: translate(220px, -180px) rotate(360deg) scale(0);
        opacity: 0;
    }
}

.square-box:nth-child(1)  { top:10%; left:5%;  width:45px;height:45px; border-color:#3b82f6; animation-duration:7s; animation-delay:0s; }
.square-box:nth-child(2)  { top:5%;  left:20%; width:65px;height:65px; border-color:#ec4899; animation-duration:10s; animation-delay:1.5s; }
.square-box:nth-child(3)  { top:15%; left:35%; width:35px;height:35px; border-color:#10b981; animation-duration:8s; animation-delay:2s; }
.square-box:nth-child(4)  { top:8%;  left:50%; width:75px;height:75px; border-color:#f59e0b; animation-duration:12s; animation-delay:0.5s; }
.square-box:nth-child(5)  { top:20%; left:65%; width:30px;height:30px; border-color:#ef4444; animation-duration:6s; animation-delay:3s; }
.square-box:nth-child(6)  { top:3%;  left:80%; width:85px;height:85px; border-color:#8b5cf6; animation-duration:11s; animation-delay:1.8s; }
.square-box:nth-child(7)  { top:25%; left:90%; width:40px;height:40px; border-color:#1f2937; animation-duration:9s; animation-delay:2.8s; }
.square-box:nth-child(8)  { top:12%; left:10%; width:50px;height:50px; border-color:#3b82f6; animation-duration:7.5s; animation-delay:0.2s; }
.square-box:nth-child(9)  { top:30%; left:25%; width:55px;height:55px; border-color:#10b981; animation-duration:8.5s; animation-delay:3.5s; }
.square-box:nth-child(10) { top:18%; left:45%; width:70px;height:70px; border-color:#ec4899; animation-duration:13s; animation-delay:1.2s; }
.square-box:nth-child(11) { top:7%;  left:60%; width:28px;height:28px; border-color:#f59e0b; animation-duration:5.5s; animation-delay:2.2s; }
.square-box:nth-child(12) { top:22%; left:75%; width:60px;height:60px; border-color:#ef4444; animation-duration:9.5s; animation-delay:0.7s; }
*/

/* 动态流动网格背景 */
.grid-bg {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.15) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.15) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 8s linear infinite;
    z-index: 0;
    top: 0;
}

/* Hero section 特殊高度设置 - 首页 */
.hero .grid-bg {
    height: 100vh;
    max-height: 650px;
    min-height: 400px;
}

/* 其他页面 header 的高度设置 */
.page-header .grid-bg,
.activity-header .grid-bg,
.rank-header .grid-bg,
.uc-header .grid-bg {
    height: 100%;
    max-height: 320px;
    min-height: 200px;
}

@keyframes gridMove {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 50px 50px;
    }
}

.title {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #333;
    font-size: 46px;
    font-weight: bold;
    z-index: 10;
}

/* 彩色正方形动画效果 - 当前使用 */
.flying-squares-container {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    top: 17%;
    left: 0;
}

.square-box {
    position: absolute;
    border-radius: 0;
    background: rgba(255, 255, 255, 0.4);
    border: 1.5px solid;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    animation: fly-burst 10s linear infinite;
}

@keyframes fly-burst {
    0% {
        transform: translate(0, 0) rotate(0deg) scale(1);
        opacity: 1;
    }
    70% {
        opacity: 1;
    }
    85% {
        transform: translate(180px, -120px) rotate(180deg) scale(1.1);
        opacity: 0.5;
    }
    90% {
        transform: translate(200px, -150px) rotate(270deg) scale(0.8);
        opacity: 0.2;
    }
    100% {
        transform: translate(220px, -180px) rotate(360deg) scale(0);
        opacity: 0;
    }
}

.square-box:nth-child(1)  { top:10%; left:5%;  width:45px;height:45px; border-color:#3b82f6; animation-duration:7s; animation-delay:0s; }
.square-box:nth-child(2)  { top:5%;  left:20%; width:65px;height:65px; border-color:#ec4899; animation-duration:10s; animation-delay:1.5s; }
.square-box:nth-child(3)  { top:15%; left:35%; width:35px;height:35px; border-color:#10b981; animation-duration:8s; animation-delay:2s; }
.square-box:nth-child(4)  { top:8%;  left:50%; width:75px;height:75px; border-color:#f59e0b; animation-duration:12s; animation-delay:0.5s; }
.square-box:nth-child(5)  { top:20%; left:65%; width:30px;height:30px; border-color:#ef4444; animation-duration:6s; animation-delay:3s; }
.square-box:nth-child(6)  { top:3%;  left:80%; width:85px;height:85px; border-color:#8b5cf6; animation-duration:11s; animation-delay:1.8s; }
.square-box:nth-child(7)  { top:25%; left:90%; width:40px;height:40px; border-color:#1f2937; animation-duration:9s; animation-delay:2.8s; }
.square-box:nth-child(8)  { top:12%; left:10%; width:50px;height:50px; border-color:#3b82f6; animation-duration:7.5s; animation-delay:0.2s; }
.square-box:nth-child(9)  { top:30%; left:25%; width:55px;height:55px; border-color:#10b981; animation-duration:8.5s; animation-delay:3.5s; }
.square-box:nth-child(10) { top:18%; left:45%; width:70px;height:70px; border-color:#ec4899; animation-duration:13s; animation-delay:1.2s; }
.square-box:nth-child(11) { top:7%;  left:60%; width:28px;height:28px; border-color:#f59e0b; animation-duration:5.5s; animation-delay:2.2s; }
.square-box:nth-child(12) { top:22%; left:75%; width:60px;height:60px; border-color:#ef4444; animation-duration:9.5s; animation-delay:0.7s; }