/***************************************** 全局配置 *****************************************/

:root {
    /* 配色：黑白灰 + 荧光橙点缀 */
    --color-bg: #F5F5F7;           /* 类似 Apple 的浅灰底色 */
    --color-card: #FFFFFF;
    --color-text-primary: #1D1D1F; /* 近乎黑色的深灰 */
    --color-text-secondary: #86868B;
    --color-accent: #FF4D00;       /* 国际橙：活力、现代 */
    --color-border: rgba(0, 0, 0, 0.08);
    --color-code-bg: #1e1e1e;

    /* 布局参数 */
    --radius-xl: 24px;             /* 超大圆角 */
    --radius-md: 12px;
    --radius-btn: 100px;           /* 胶囊按钮 */
    --container-width: 1280px;
    --nav-height: 80px;

    /* 动效 */
    --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
    --transition-smooth: all 0.4s var(--ease-out-expo);
}

/* 暗黑模式变量 */
body.dark-mode {
    --color-bg: #000000;
    --color-card: #1C1C1E;
    --color-text-primary: #F5F5F7;
    --color-text-secondary: #A1A1A6;
    --color-border: rgba(255, 255, 255, 0.1);
}

/* 基础重置 */
* { margin: 0; padding: 0; box-sizing: border-box; outline: none; }

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    -webkit-font-smoothing: antialiased;
    line-height: 1.5;
    padding-top: 100px; /* 给悬浮导航留空间 */
    transition: background-color 0.5s ease;
}

a { text-decoration: none; color: inherit; cursor: pointer; }
ul { list-style: none; }
img { display: block; width: 100%; height: auto; object-fit: cover; }

/************************************ 公共组件 - 导航栏 ************************************/
/* 移动平台下的导航栏展开按钮 */
.bc-navbar-mobile-menu-expand-checkbox { display: none; }

.bc-navbar-mobile-menu-expand-checkbox-label { display: none; font-size: 1.5rem; cursor: pointer; }
@media (max-width: 768px) {
    .bc-navbar-mobile-menu-expand-checkbox-label { display: block; }
}

/* 移动平台下的导航菜单 */
.bc-navbar-mobile-menu {
    opacity: 0; visibility: hidden;
}
@media (max-width: 768px) {
    /* 默认不显示 */
    .bc-navbar-mobile-menu {
        position: fixed; top: 90px; left: 5%; width: 90%;
        background: var(--color-card);
        border-radius: 20px;
        padding: 20px;
        box-shadow: 0 40px 80px rgba(0,0,0,0.1);
        opacity: 0; visibility: hidden; transform: translateY(-20px);
        transition: 0.3s;
        border: 1px solid var(--color-border);
        z-index: 100;
    }
    /* 选中时显示 */
    #-navbar-mobile-menu-expand-checkbox:checked ~ .bc-navbar-mobile-menu {
        opacity: 1; visibility: visible; transform: translateY(0);
    }
}

/* 导航栏 */
.bc-navbar-container {
    position: fixed;
    top: 20px; left: 0; right: 0;
    z-index: 1000;
    display: flex;
    justify-content: center;
    pointer-events: none; /* 让两侧透气不可点 */
}

.bc-navbar-body {
    width: 100%;
    justify-content: space-between;
    pointer-events: auto;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    padding: 12px 24px;
    margin: 0 12px;
    border-radius: var(--radius-btn);
    display: flex;
    align-items: center;
    gap: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
    transition: var(--transition-smooth);
    max-width: 1280px;
}
body.dark-mode .bc-navbar-body {
    background: rgba(28, 28, 30, 0.8);
}

.bc-navbar-body-logo {
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--color-text-primary);
    position: relative;
}
.bc-navbar-body-logo::after {
    content: '随笔记录';
    font-size: 1rem;
    color: var(--color-accent);
}

.bc-navbar-body-logo-img {
    width: 36px;
    height: 36px;
    display: inline-block;
    margin-right: 6px;
    vertical-align: middle;
}

.bc-navbar-body-links {
    display: flex; gap: 24px; align-items: center; z-index: 10;
}
@media (max-width: 768px) {
    .bc-navbar-body-links {
        display: none;
    }
}

.bc-navbar-body-link-item {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    position: relative;
    padding: 8px 0;
    transition: color 0.2s;
}
.bc-navbar-body-link-item:hover {
    color: var(--color-text-primary);
}
.bc-navbar-body-link-item:hover .dropdown {
    opacity: 1; visibility: visible;
    transform: translateX(-50%) translateY(10px);
}

.bc-navbar-body-link-item-decoration::after {
    content: '⌄';
    font-size: 0.8em;
    margin-left: 4px;
    position: relative;
    top: -1px;
}

.bc-navbar-body-link-item-submenu {
    position: absolute;
    top: 100%; left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--color-card);
    border: 1px solid var(--color-border);
    padding: 8px;
    border-radius: 16px;
    min-width: 140px;
    opacity: 0; visibility: hidden;
    transition: var(--transition-smooth);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}
.bc-navbar-body-link-item:hover .bc-navbar-body-link-item-submenu {
    opacity: 1; visibility: visible;
    transform: translateX(-50%) translateY(10px);
}
.bc-navbar-body-link-item-submenu a {
    display: block;
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}
.bc-navbar-body-link-item-submenu a:hover {
    background: var(--color-bg);
    color: var(--color-text-primary);
}

.bc-navbar-body-actions {
    display: flex; align-items: center; gap: 12px; border-left: 1px solid var(--color-border); padding-left: 24px;
}

.bc-navbar-body-action-item {
    background: transparent;
    border: none;
    width: 36px; height: 36px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--color-text-primary);
    transition: background 0.2s;
}
.bc-navbar-body-action-item:hover {
    background: var(--color-bg);
}


/************************************ 公共组件 - 页脚 ************************************/
.bc-footer {
    margin-top: 100px;
    padding: 60px 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

/************************************ 公共组件 - 分页器 ************************************/
.bc-paginator {
    margin-top: 60px;
    display: flex;
    justify-content: center;
    gap: 8px;
}

.bc-paginator-dot {
    width: 44px; height: 44px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
}
.bc-paginator-dot:hover {
    background: rgba(0,0,0,0.05);
}
.bc-paginator-dot:active {
    background: var(--color-text-primary);
    color: var(--color-card);
}