/* 全局变量定义 - 优化性能和兼容性 */
:root {
    /* 浅色模式变量 */
    --primary-color: #007BFF;
    --hover-color: #66a6ff;
    --bg-gradient: linear-gradient(-45deg, #f3f9ff, #e6f4ff, #cceaff); /* 简化渐变颜色数量 */
    --text-color: #333;
    --card-bg: rgba(255, 255, 255, 0.1);
    --card-text: #333;
    --shadow-light: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 12px 24px rgba(0, 0, 0, 0.2);
    --transition-timing: 0.3s ease;
    --theme-transition: color 0.5s ease,
                        background 0.5s ease,
                        background-color 0.5s ease,
                        border-color 0.5s ease,
                        box-shadow 0.5s ease;
}

/* 深色模式变量 */
[data-theme="dark"] {
    --primary-color: #3f93ff;
    --hover-color: #8ab9ff;
    --bg-gradient: linear-gradient(-45deg, #1a1a2e, #16213e, #1f3756, #293b61);
    --text-color: #e6e6e6;
    --card-bg: rgba(30, 40, 60, 0.4);
    --card-text: #e6e6e6;
    --shadow-light: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 12px 24px rgba(0, 0, 0, 0.4);
}

/* 全局动画定义 */
@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 添加简化的页面过渡动画 */
@keyframes simpleFadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        filter: drop-shadow(0 4px 12px rgba(0, 123, 255, 0.3));
    }
    50% {
        transform: scale(1.05);
        filter: drop-shadow(0 6px 16px rgba(0, 123, 255, 0.4));
    }
}

/* 基础样式设置 */
html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg-gradient);
    background-size: 200% 200%; /* 减少背景尺寸，提高性能 */
    animation: gradientBG 25s linear infinite; /* 延长动画时间，减少CPU使用 */
    -webkit-animation: gradientBG 25s linear infinite;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: var(--text-color);
    transition: var(--theme-transition);
    will-change: background-position, color;
    display: flex;
    flex-direction: column;
    min-height: 100vh; /* 确保内容不足时 footer 也在底部 */
    font-family: 'Arial', 'Segoe UI', sans-serif; /* 扩展字体族，增强兼容性 */
    transform: translateZ(0); /* 优化渲染性能 */
}

.container {
    max-width: 800px;
    margin: 40px auto;
    background: rgba(255, 255, 255, 0.1); /* 略微增加透明度 */
    backdrop-filter: blur(15px); /* 更强的模糊效果 */
    -webkit-backdrop-filter: blur(15px);
    padding: 30px;
    border-radius: 15px;
    /* 模拟玻璃边缘的光泽 */
    border: 1px solid rgba(255, 255, 255, 0.3); /* 浅色边框 */
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1); /* 增强阴影 */
    color: var(--card-text);
    flex-grow: 1;
    animation: simpleFadeIn 0.5s ease;
}

[data-theme="dark"] .container {
    background: rgba(30, 40, 60, 0.3); /* 深色模式下更透明的背景 */
    border: 1px solid rgba(255, 255, 255, 0.1); /* 深色模式下更柔和的边框 */
}

/* 页面头部样式 - 改进版 */
.page-header {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-bottom: 3rem;
    padding: 2.5rem;
    background: linear-gradient(135deg, 
        rgba(0, 123, 255, 0.15) 0%, 
        rgba(102, 166, 255, 0.1) 50%, 
        rgba(255, 255, 255, 0.08) 100%);
    backdrop-filter: blur(25px) saturate(180%);
    -webkit-backdrop-filter: blur(25px) saturate(180%);
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    box-shadow: 
        0 12px 40px rgba(0, 123, 255, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
    will-change: transform, backdrop-filter;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 123, 255, 0.1), transparent);
    transition: left 0.8s ease;
}

.page-header:hover::before {
    left: 100%;
}

.header-icon {
    font-size: 4.5rem;
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--hover-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: float 4s ease-in-out infinite, pulse 2s ease-in-out infinite;
    will-change: transform, filter;
    filter: drop-shadow(0 4px 12px rgba(0, 123, 255, 0.3));
}

.header-content {
    flex: 1;
}

.page-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    margin: 0 0 0.8rem 0;
    background: linear-gradient(135deg, var(--primary-color), var(--hover-color), #8ab9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 6px 12px rgba(0, 123, 255, 0.2);
    font-weight: 700;
    letter-spacing: -0.5px;
}

.page-subtitle {
    font-size: 1.3rem;
    margin: 0 0 1.5rem 0;
    color: var(--text-color);
    opacity: 0.9;
    font-weight: 400;
    line-height: 1.5;
    max-width: 600px;
}

.version-badge {
    display: flex;
    gap: 0.5rem;
}

.badge {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge.feedback {
    background: linear-gradient(135deg, var(--primary-color), var(--hover-color));
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.badge.feedback::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.6s ease;
}

.badge.feedback:hover::before {
    left: 100%;
}

.badge.feedback:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 123, 255, 0.4);
}

.badge.community {
    background: linear-gradient(135deg, rgba(0, 123, 255, 0.15), rgba(102, 166, 255, 0.1));
    color: var(--primary-color);
    border: 2px solid rgba(0, 123, 255, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.badge.community:hover {
    background: linear-gradient(135deg, rgba(0, 123, 255, 0.2), rgba(102, 166, 255, 0.15));
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.2);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .page-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
        padding: 1.5rem;
    }
    
    .header-icon {
        font-size: 3rem;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .page-subtitle {
        font-size: 1rem;
    }
    
    .version-badge {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .page-header {
        padding: 1rem;
    }
    
    .header-icon {
        font-size: 2.5rem;
    }
    
    .page-title {
        font-size: 1.5rem;
    }
    
    .badge {
        font-size: 0.8rem;
        padding: 0.2rem 0.6rem;
    }
}

h1 {
    color: var(--text-color);
    text-align: center;
    margin-bottom: 30px;
    font-size: clamp(2rem, 4vw, 3rem);
}

p {
    margin-bottom: 15px;
    color: var(--card-text);
}

.giscus-container {
    margin-top: 30px;
    padding: 20px;
    border: none;
    border-radius: 15px;
    background-color: transparent;
    box-shadow: var(--shadow-light);
    overflow: hidden;
}

.footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1); /* 略微增加透明度 */
    backdrop-filter: blur(15px); /* 更强的模糊效果 */
    -webkit-backdrop-filter: blur(15px);
    border-top: 1px solid rgba(255, 255, 255, 0.3); /* 浅色模式下更柔和的分割线 */
    color: var(--text-color);
    width: 100%;
    box-shadow: 0 -4px 30px rgba(0, 0, 0, 0.05); /* 底部阴影 */
}

[data-theme="dark"] .footer {
    background: rgba(30, 40, 60, 0.3); /* 深色模式下更透明的背景 */
    border-top: 1px solid rgba(255, 255, 255, 0.1); /* 深色模式下更柔和的分割线 */
}

.home-link {
    display: inline-block;
    margin-top: 10px;
    padding: 10px 15px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color var(--transition-timing);
}

.home-link:hover {
    background-color: var(--hover-color);
}

#success-message {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #4CAF50;
    color: white;
    padding: 15px 20px;
    border-radius: 5px;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    display: none;
}

.category-selector {
    text-align: center;
    margin-bottom: 30px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.category-button {
    background-color: rgba(255, 255, 255, 0.15); /* 略微增加透明度 */
    backdrop-filter: blur(8px); /* 更强的模糊效果 */
    -webkit-backdrop-filter: blur(8px);
    color: var(--card-text);
    border: 1px solid rgba(255, 255, 255, 0.4); /* 浅色模式下更强的边框 */
    padding: 10px 20px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9em;
    white-space: nowrap;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1); /* 调整阴影 */
}

[data-theme="dark"] .category-button {
    background-color: rgba(30, 40, 60, 0.4); /* 深色模式下更透明的背景 */
    border: 1px solid rgba(0, 0, 0, 0.5); /* 深色模式下更强的边框 */
}

.category-button:hover {
    background-color: var(--hover-color);
    color: white;
    border-color: var(--hover-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2); /* 悬停阴影 */
}

.category-button.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2); /* 激活阴影 */
}