/* ====== 基础样式重置 ====== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

:root {
    --primary-color: #6a89cc;
    --secondary-color: #4a69bd;
    --accent-color: #1e3799;
    --dark-bg: #0a0e17; /* 更深的背景色 */
    --light-text: #ffffff; /* 更白的文字 */
    --gray-text: #dddddd; /* 更亮的灰色文字 */
    --card-bg: rgba(255, 255, 255, 0.12); /* 提高卡片透明度 */
    --border-color: rgba(255, 255, 255, 0.18);
}

/* ====== 增强背景图片效果 ====== */
body {
    /* 核心修改：大幅减少渐变层透明度，让背景图片更明显 */
    background-image: 
        /* 非常轻微的渐变叠加 - 几乎透明 */
        linear-gradient(135deg, rgba(10, 14, 23, 0.15) 0%, rgba(16, 25, 40, 0.25) 100%),
        /* 背景图片 */
        url('../img/background.jpg');
    
    background-color: var(--dark-bg); /* 备用背景色 */
    background-repeat: no-repeat;
    background-position: center center;
    background-attachment: fixed;
    background-size: cover;
    
    /* 使用normal混合模式，不降低图片亮度 */
    background-blend-mode: normal;
    
    /* 添加滤镜增强图片效果 */
    filter: brightness(1.15) contrast(1.05) saturate(1.1);
    -webkit-filter: brightness(1.15) contrast(1.05) saturate(1.1);
    
    color: var(--light-text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    
    /* 平滑的背景加载效果 */
    transition: background-image 0.8s ease, filter 0.8s ease;
}

/* 背景加载状态 */
body.loading-bg {
    background-image: linear-gradient(135deg, var(--dark-bg) 0%, #16213e 100%);
    filter: brightness(1);
}

/* 背景加载完成后的动画 */
@keyframes bgFadeIn {
    from {
        opacity: 0.9;
        filter: brightness(0.95);
    }
    to {
        opacity: 1;
        filter: brightness(1.15);
    }
}

body.bg-loaded {
    animation: bgFadeIn 1.2s ease-out forwards;
}

/* ====== 头部样式 ====== */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    background-color: rgba(10, 14, 23, 0.92); /* 更透明的头部 */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.3);
}

header img {
    border-radius: 50%;
    border: 2px solid var(--primary-color);
    transition: transform 0.3s ease;
    box-shadow: 0 0 12px rgba(106, 137, 204, 0.4);
}

header img:hover {
    transform: scale(1.1);
    box-shadow: 0 0 18px rgba(106, 137, 204, 0.6);
}

.left {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-left: 15px;
    text-shadow: 0 0 8px rgba(106, 137, 204, 0.5);
}

#time {
    font-size: 0.9rem;
    color: var(--gray-text);
    background-color: rgba(255, 255, 255, 0.12);
    padding: 5px 15px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* ====== 主标题区域 ====== */
.big-title-container {
    text-align: center;
    padding: 200px 20px 120px;
    background: linear-gradient(to bottom, 
        transparent 0%, 
        rgba(10, 14, 23, 0.4) 60%, 
        rgba(10, 14, 23, 0.8) 100%);
    position: relative;
    overflow: hidden;
}

.big-title-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 30%, 
        rgba(106, 137, 204, 0.2) 0%, 
        transparent 60%);
    z-index: -1;
    pointer-events: none;
}

.title {
    font-size: 3.2rem;
    background: linear-gradient(45deg, var(--primary-color), #8fa8ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 20px;
    text-shadow: 0 0 25px rgba(106, 137, 204, 0.4);
    animation: titleGlow 3s ease-in-out infinite alternate;
}

@keyframes titleGlow {
    0% { 
        text-shadow: 0 0 25px rgba(106, 137, 204, 0.4),
                     0 0 40px rgba(143, 168, 255, 0.2);
    }
    100% { 
        text-shadow: 0 0 35px rgba(106, 137, 204, 0.6),
                     0 0 60px rgba(143, 168, 255, 0.3);
    }
}

.sub-title {
    font-size: 1.3rem;
    color: var(--gray-text);
    font-style: italic;
    background: rgba(0, 0, 0, 0.2);
    padding: 12px 25px;
    border-radius: 25px;
    display: inline-block;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
}

/* ====== 一言区域 ====== */
.hitokoto {
    margin: 30px auto;
    padding: 20px 30px;
    background-color: rgba(10, 14, 23, 0.7);
    border-radius: 18px;
    max-width: 700px;
    border: 1px solid rgba(106, 137, 204, 0.3);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
}

.hitokoto:hover {
    background-color: rgba(10, 14, 23, 0.8);
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4);
    border-color: var(--primary-color);
}

#hitokoto_text {
    color: #b8d1ff; /* 更亮的蓝色 */
    text-decoration: none;
    font-size: 1.15rem;
    display: block;
    transition: color 0.3s ease;
    text-shadow: 0 0 5px rgba(184, 209, 255, 0.5);
}

#hitokoto_text:hover {
    color: #ffffff;
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.7);
}

/* ====== 向下箭头 ====== */
.arrow {
    margin: 40px 0;
    animation: bounce 2s infinite;
}

.arrow img {
    width: 45px;
    height: 45px;
    opacity: 0.8;
    filter: drop-shadow(0 0 8px rgba(106, 137, 204, 0.7));
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {transform: translateY(0);}
    40% {transform: translateY(-12px);}
    60% {transform: translateY(-6px);}
}

/* ====== 主要内容区域 ====== */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.blank {
    padding-bottom: 50px;
}

.regular_color, .alternate_color {
    padding: 45px;
    border-radius: 18px;
    margin-bottom: 35px;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
    
    /* 使内容区域更加透明，让背景更透出 */
    background-color: rgba(10, 14, 23, 0.65);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}

/* 为卡片添加顶部光边效果 */
.regular_color::before, .alternate_color::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    opacity: 0.8;
}

.regular_color:hover, .alternate_color:hover {
    transform: translateY(-10px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4);
    border-color: rgba(106, 137, 204, 0.5);
    background-color: rgba(10, 14, 23, 0.75);
}

/* 交替颜色样式 */
.alternate_color {
    background-color: rgba(106, 137, 204, 0.15);
    border: 1px solid rgba(106, 137, 204, 0.25);
}

.alternate_color:hover {
    background-color: rgba(106, 137, 204, 0.2);
}

.transparent {
    padding: 35px;
    text-align: center;
    background-color: rgba(10, 14, 23, 0.5);
    border-radius: 18px;
    margin-top: 35px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

/* ====== 标题样式 ====== */
h1 {
    color: var(--primary-color);
    margin-bottom: 25px;
    position: relative;
    display: inline-block;
    font-size: 2.3rem;
}

h1 i {
    margin-right: 12px;
    font-size: 1.8rem;
}

h1::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
    box-shadow: 0 0 10px rgba(106, 137, 204, 0.5);
}

/* ====== 标签样式 ====== */
.label {
    display: inline-block;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 8px 20px;
    margin: 8px;
    border-radius: 25px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border: none;
    cursor: default;
    box-shadow: 0 6px 15px rgba(106, 137, 204, 0.4);
    font-weight: 500;
}

.label:hover {
    transform: translateY(-4px) scale(1.08);
    box-shadow: 0 10px 20px rgba(106, 137, 204, 0.6);
}

/* ====== 技能条样式 ====== */
.skills-container {
    max-width: 800px;
    margin: 0 auto;
}

.skill {
    margin: 30px 0;
}

.skill-name {
    display: block;
    margin-bottom: 12px;
    font-weight: 500;
    color: var(--light-text);
    font-size: 1.15rem;
    display: flex;
    justify-content: space-between;
}

.skill-bar {
    height: 14px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 7px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.2);
}

.skill-level {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 7px;
    transition: width 1.5s cubic-bezier(0.22, 0.61, 0.36, 1);
    position: relative;
    overflow: hidden;
    box-shadow: 0 0 10px rgba(106, 137, 204, 0.5);
}

.skill-level::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ====== 项目网格 ====== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 25px;
}

.project-card {
    background: rgba(10, 14, 23, 0.7);
    border-radius: 15px;
    padding: 30px;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(10px);
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

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

.project-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    border-color: var(--primary-color);
    background: rgba(10, 14, 23, 0.85);
}

.project-card h3 {
    color: var(--primary-color);
    margin-bottom: 18px;
    font-size: 1.4rem;
}

.project-card p {
    color: var(--gray-text);
    margin-bottom: 20px;
    font-size: 1rem;
    line-height: 1.6;
    flex-grow: 1;
}

.tech-tags {
    margin: 20px 0;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tech-tag {
    display: inline-block;
    background: rgba(106, 137, 204, 0.25);
    color: #b8d1ff;
    padding: 6px 14px;
    border-radius: 18px;
    font-size: 0.85rem;
    border: 1px solid rgba(106, 137, 204, 0.4);
}

.project-link {
    display: inline-block;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 12px 25px;
    border-radius: 30px;
    text-decoration: none;
    transition: all 0.3s ease;
    text-align: center;
    font-weight: 500;
    margin-top: auto;
    border: none;
    box-shadow: 0 6px 15px rgba(106, 137, 204, 0.4);
}

.project-link:hover {
    background: linear-gradient(45deg, var(--secondary-color), var(--accent-color));
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 12px 25px rgba(106, 137, 204, 0.6);
}

/* ====== 时间线样式 ====== */
.timeline {
    position: relative;
    max-width: 850px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 35px;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
    box-shadow: 0 0 10px rgba(106, 137, 204, 0.5);
}

.timeline-item {
    position: relative;
    margin: 40px 0;
    padding-left: 85px;
}

.timeline-date {
    position: absolute;
    left: 0;
    top: 0;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 10px 22px;
    border-radius: 30px;
    font-size: 0.95rem;
    font-weight: 500;
    box-shadow: 0 6px 15px rgba(106, 137, 204, 0.4);
    z-index: 2;
}

.timeline-content {
    background-color: rgba(10, 14, 23, 0.7);
    padding: 28px;
    border-radius: 15px;
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.timeline-content:hover {
    transform: translateX(8px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    border-color: var(--primary-color);
    background-color: rgba(10, 14, 23, 0.8);
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.timeline-content p {
    color: var(--gray-text);
    font-size: 1rem;
    line-height: 1.6;
}

/* ====== 友情链接样式 ====== */
.friend-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    margin-top: 15px;
}

.friend-link {
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--light-text);
    padding: 14px 28px;
    border-radius: 35px;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.15);
    font-weight: 500;
    backdrop-filter: blur(5px);
}

.friend-link:hover {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    transform: translateY(-6px) scale(1.08);
    box-shadow: 0 12px 25px rgba(106, 137, 204, 0.5);
    color: white;
    border-color: transparent;
}

/* ====== 页脚样式 ====== */
footer {
    color: var(--gray-text);
    font-size: 0.95rem;
    line-height: 1.8;
}

footer a {
    color: #b8d1ff; /* 更亮的链接颜色 */
    text-decoration: none;
    transition: all 0.3s ease;
    border-bottom: 1px dotted transparent;
}

footer a:hover {
    color: #ffffff;
    border-bottom: 1px dotted #b8d1ff;
}

.visitor-count {
    margin-top: 20px;
    color: var(--primary-color);
    font-size: 1.05rem;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(106, 137, 204, 0.15);
    padding: 10px 20px;
    border-radius: 25px;
    border: 1px solid rgba(106, 137, 204, 0.3);
}

.visitor-count i {
    font-size: 1.2rem;
}

/* ====== 返回顶部按钮 ====== */
#backToTop {
    position: fixed;
    bottom: 35px;
    right: 35px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    cursor: pointer;
    font-size: 1.4rem;
    display: none;
    z-index: 999;
    transition: all 0.3s ease;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
    opacity: 0;
    transform: translateY(20px);
}

#backToTop.show {
    opacity: 1;
    transform: translateY(0);
    display: flex;
    align-items: center;
    justify-content: center;
}

#backToTop:hover {
    background: linear-gradient(45deg, var(--secondary-color), var(--accent-color));
    transform: translateY(-8px) scale(1.15);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.5);
}

/* ====== 背景音乐播放器 ====== */
#music-player {
    position: fixed;
    bottom: 110px;
    right: 35px;
    z-index: 999;
}

#music-toggle {
    width: 55px;
    height: 55px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    cursor: pointer;
    font-size: 1.3rem;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

#music-toggle:hover {
    transform: scale(1.15) rotate(15deg);
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.5);
}

/* ====== 响应式设计 ====== */
@media (max-width: 768px) {
    /* 移动端进一步减少背景叠加 */
    body {
        background-image: 
            linear-gradient(135deg, rgba(10, 14, 23, 0.1) 0%, rgba(16, 25, 40, 0.2) 100%),
            url('../img/background.jpg');
        background-attachment: scroll;
        filter: brightness(1.1) contrast(1.05) saturate(1.05);
        -webkit-filter: brightness(1.1) contrast(1.05) saturate(1.05);
    }
    
    .title {
        font-size: 2.3rem;
    }
    
    .big-title-container {
        padding: 160px 20px 90px;
    }
    
    .regular_color, .alternate_color {
        padding: 25px 20px;
        margin-bottom: 25px;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    
    .timeline::before {
        left: 25px;
    }
    
    .timeline-item {
        padding-left: 65px;
        margin: 30px 0;
    }
    
    .timeline-date {
        padding: 8px 18px;
        font-size: 0.9rem;
    }
    
    header {
        padding: 12px 20px;
    }
    
    .left {
        font-size: 1.3rem;
    }
    
    #time {
        font-size: 0.85rem;
        padding: 5px 12px;
    }
    
    .friend-links {
        gap: 12px;
    }
    
    .friend-link {
        padding: 12px 22px;
        font-size: 0.95rem;
    }
    
    #backToTop {
        width: 55px;
        height: 55px;
        bottom: 25px;
        right: 25px;
        font-size: 1.3rem;
    }
    
    #music-player {
        bottom: 95px;
        right: 25px;
    }
    
    #music-toggle {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
    
    /* 移动端减少毛玻璃效果 */
    .regular_color, .alternate_color, .transparent, .hitokoto {
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 2rem;
    }
    
    .sub-title {
        font-size: 1.1rem;
        padding: 10px 20px;
    }
    
    .hitokoto {
        padding: 18px 22px;
        margin: 25px auto;
    }
    
    .label {
        padding: 7px 16px;
        font-size: 0.9rem;
        margin: 5px;
    }
    
    .project-card {
        padding: 25px;
    }
    
    .friend-links {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .friend-link {
        width: 100%;
        max-width: 280px;
        text-align: center;
    }
    
    h1 {
        font-size: 1.9rem;
    }
    
    h1 i {
        font-size: 1.5rem;
    }
}

/* ====== 滚动条样式 ====== */
::-webkit-scrollbar {
    width: 14px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 7px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border-radius: 7px;
    border: 3px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(45deg, var(--secondary-color), var(--accent-color));
}

/* ====== 背景控制面板 ====== */
#bg-controls {
    position: fixed;
    bottom: 180px;
    right: 35px;
    z-index: 999;
    background: rgba(10, 14, 23, 0.85);
    border-radius: 20px;
    padding: 20px;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
    display: none;
}

.bg-controls-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    color: var(--primary-color);
    font-weight: 500;
}

.bg-controls-close {
    background: none;
    border: none;
    color: var(--gray-text);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.bg-controls-close:hover {
    color: var(--primary-color);
}

.bg-control-item {
    margin: 15px 0;
}

.bg-control-item label {
    display: block;
    margin-bottom: 8px;
    color: var(--gray-text);
    font-size: 0.95rem;
}

.bg-control-slider {
    width: 200px;
    height: 8px;
    -webkit-appearance: none;
    background: rgba(106, 137, 204, 0.2);
    border-radius: 4px;
    outline: none;
}

.bg-control-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 3px solid white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

/* 背景控制按钮 */
#bg-control-toggle {
    position: fixed;
    bottom: 180px;
    right: 35px;
    width: 55px;
    height: 55px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    cursor: pointer;
    font-size: 1.3rem;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 998;
}

#bg-control-toggle:hover {
    transform: scale(1.15) rotate(15deg);
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.5);
}

@media (max-width: 768px) {
    #bg-controls {
        bottom: 160px;
        right: 25px;
        padding: 15px;
    }
    
    #bg-control-toggle {
        bottom: 160px;
        right: 25px;
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
    
    .bg-control-slider {
        width: 180px;
    }
}

/* ====== 打印样式 ====== */
@media print {
    body {
        background: none !important;
        background-color: white !important;
        color: black !important;
        filter: none !important;
    }
    
    .regular_color, .alternate_color, .transparent {
        background: white !important;
        border: 1px solid #ddd !important;
        box-shadow: none !important;
        backdrop-filter: none !important;
    }
    
    #backToTop, #music-player, #bg-controls, #bg-control-toggle {
        display: none !important;
    }
}

/* ====== 自定义背景滤镜 ====== */
/* 这些类可以通过JavaScript动态添加来调整背景效果 */
body.bg-bright {
    filter: brightness(1.3) contrast(1.1) saturate(1.2) !important;
}

body.bg-normal {
    filter: brightness(1.15) contrast(1.05) saturate(1.1) !important;
}

body.bg-dark {
    filter: brightness(0.9) contrast(1) saturate(0.9) !important;
}

body.bg-no-filter {
    filter: none !important;
}

body.bg-no-overlay {
    background-image: url('../img/background.jpg') !important;
}

/* ====== 加载动画 ====== */
@keyframes contentFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

body.loaded main {
    animation: contentFadeIn 0.8s ease-out forwards;
}