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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    flex-direction: column;
    height: 100vh; /* 视口全高 */
    overflow: hidden; /* 防止外层滚动，内部局部滚动 */
}

/* 顶部导航栏 */
.top-navbar {
    height: 60px;
    background-color: #1a1a2e;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 25px;
    z-index: 100;
    border-bottom: 1px solid #30304d;
}

.logo {
    font-size: 1.2rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* 内容容器 */
.container {
    display: flex;
    flex: 1; /* 占据剩余高度 */
}

/* 侧边导航栏 - 全高实现关键 */
.side-sidebar {
    width: 240px;
    background-color: #f8f9fa;
    border-right: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.nav-menu {
    list-style: none;
    padding: 20px 0;
}

.section-title {
    padding: 10px 20px;
    font-size: 0.75rem;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-menu li:not(.section-title) {
    padding: 12px 25px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-menu li.active {
    background-color: #e7f0ff;
    color: #314255;
    font-weight: bolder;
    text-shadow: 0 0 3px #2d3b49;
    border-right: 4px solid #314255;
}

.nav-menu li:hover:not(.active) {
    background-color: #eeeeee;
}

/* 主展示区 */
.main-content {
    flex: 1;
    background-color: #ffffff;
    padding: 20px;
    overflow-y: auto; /* 内容过多时在主区滚动 */
}

#visualizer-canvas {
    width: 100%;
    height: 100%;
    background: #fdfdfd;
    border: 2px dashed #ccc;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.sidebar-footer {
    padding: 20px;
    font-size: 0.8rem;
    color: #aaa;
    border-top: 1px solid #eee;
}
.main-content {
    flex: 1;
    padding: 0; /* 嵌入页面建议去掉 padding，让子页面控制边距 */
    overflow: hidden;
}

#visualizer-container {
    width: 100%;
    height: 100%;
}

#main-frame {
    width: 100%;
    height: 100%;
    display: block;
    border: none;
}

/* 顶部菜单容器 */
.top-menu {
    display: flex;
    align-items: center;
    gap: 25px; /* 增加间距 */
}

/* 链接样式优化 */
.menu-item {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    padding: 8px 12px;
    border-radius: 6px;
}

/* 悬浮时变亮并有轻微背景色 */
.menu-item:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

/* “联系作者”按钮重做 */
.btn-contact {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 25px; /* 圆角矩形更现代 */
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s shadow;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-contact:hover {
    box-shadow: 0 6px 20px rgba(0, 123, 255, 0.5);
    transform: scale(1.05);
    transition: 0.5s;
}

.btn-contact:active {
    transform: scale(0.98);
}
.logo i {
    color: #007bff;
    margin-right: 10px;
    font-size: 1.4rem;
    /* 增加一个持续的呼吸效果 */
    animation: logo-glow 2s infinite alternate;
}

@keyframes logo-glow {
    from { filter: drop-shadow(0 0 2px #007bff); }
    to { filter: drop-shadow(0 0 8px #007bff); }
}
/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    flex-direction: column;
    height: 100vh; /* 视口全高 */
    overflow: hidden; /* 防止外层滚动，内部局部滚动 */
}

/* 顶部导航栏 */
.top-navbar {
    height: 60px;
    background-color: #1a1a2e;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 25px;
    z-index: 100;
    border-bottom: 1px solid #30304d;
}

.logo {
    font-size: 1.2rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* 内容容器 */
.container {
    display: flex;
    flex: 1; /* 占据剩余高度 */
}

/* 侧边导航栏 - 全高实现关键 */
.side-sidebar {
    width: 240px;
    background-color: #f8f9fa;
    border-right: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.nav-menu {
    list-style: none;
    padding: 20px 0;
    /* 设置一个固定高度，或者根据屏幕高度计算 */
    height: 100vh;           /* 占满屏幕高度 */
    overflow-y: auto;        /* 内容超出时自动显示垂直滚动条 */
    overflow-x: hidden;      /* 隐藏水平滚动条，防止布局抖动 */
    
    /* 建议加上一些内边距，防止滚动条遮挡文字 */
    padding-bottom: 50px;
}
/* 自定义滚动条整体 */
.nav-menu::-webkit-scrollbar {
    width: 6px;               /* 滚动条宽度 */
}

/* 滚动条轨道 */
.nav-menu::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05); 
}

/* 滚动条滑块（那个可以拖动的小方块） */
.nav-menu::-webkit-scrollbar-thumb {
    background: #888;         /* 滑块颜色 */
    border-radius: 10px;      /* 圆角 */
}

/* 滑块悬停时的颜色 */
.nav-menu::-webkit-scrollbar-thumb:hover {
    background: #555; 
}
.section-title {
    padding: 10px 20px;
    font-size: 0.75rem;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: sticky;
    top: 0;
    background-color: #fff; /* 必须设置背景色，否则文字会重叠 */
    z-index: 10;
}

.nav-menu li:not(.section-title) {
    padding: 12px 25px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-menu li.active {
    background-color: #e7f0ff;
    color: #314255;
    font-weight: bolder;
    text-shadow: 0 0 3px #2d3b49;
    border-right: 4px solid #314255;
}

.nav-menu li:hover:not(.active) {
    background-color: #eeeeee;
}

/* 主展示区 */
.main-content {
    flex: 1;
    background-color: #ffffff;
    padding: 20px;
    overflow-y: auto; /* 内容过多时在主区滚动 */
}

#visualizer-canvas {
    width: 100%;
    height: 100%;
    background: #fdfdfd;
    border: 2px dashed #ccc;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.sidebar-footer {
    padding: 20px;
    font-size: 0.8rem;
    color: #aaa;
    border-top: 1px solid #eee;
}
.main-content {
    flex: 1;
    padding: 0; /* 嵌入页面建议去掉 padding，让子页面控制边距 */
    overflow: hidden;
}

#visualizer-container {
    width: 100%;
    height: 100%;
}

#main-frame {
    width: 100%;
    height: 100%;
    display: block;
    border: none;
}

/* 顶部菜单容器 */
.top-menu {
    display: flex;
    align-items: center;
    gap: 25px; /* 增加间距 */
}

/* 链接样式优化 */
.menu-item {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    padding: 8px 12px;
    border-radius: 6px;
}

/* 悬浮时变亮并有轻微背景色 */
.menu-item:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

/* “联系作者”按钮重做 */
.btn-contact {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 25px; /* 圆角矩形更现代 */
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s shadow;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-contact:hover {
    box-shadow: 0 6px 20px rgba(0, 123, 255, 0.5);
    transform: scale(1.05);
    transition: 0.5s;
}

.btn-contact:active {
    transform: scale(0.98);
}
.logo i {
    color: #007bff;
    margin-right: 10px;
    font-size: 1.4rem;
    /* 增加一个持续的呼吸效果 */
    animation: logo-glow 2s infinite alternate;
}

@keyframes logo-glow {
    from { filter: drop-shadow(0 0 2px #007bff); }
    to { filter: drop-shadow(0 0 8px #007bff); }
}