/* --- 1. 变量同步：与 article 一致 (保持原样，确保 RGB 变量存在) --- */
:root[data-theme="dark"] {
    --bg-1: #050505; --bg-2: #0a0c1a; --bg-3: #120d1a;
    --bg-1-rgb: 5, 5, 5; /* 必须定义这个，用于导航栏半透明 */
    --text-main: #ffffff;
    --text-dim: rgba(255, 255, 255, 0.5);
    --accent: #ffffff;
    --accent-rgb: 255, 255, 255; /* 用于激光线 */
    --card-bg: rgba(255, 255, 255, 0.03);
    --border-dim: rgba(255, 255, 255, 0.12);
}

:root[data-theme="light"] {
    --bg-1: #fdfdfd; --bg-2: #f0f4ff; --bg-3: #f9f0ff;
    --bg-1-rgb: 253, 253, 253;
    --text-main: #000000;
    --text-dim: rgba(0, 0, 0, 0.5);
    --accent: #000000;
    --accent-rgb: 0, 0, 0;
    --card-bg: rgba(0, 0, 0, 0.02);
    --border-dim: rgba(0, 0, 0, 0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; transition: background-color 0.6s, color 0.4s; }

body {
    background: var(--bg-1);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    overflow-x: hidden;
}

#hero-canvas { position: fixed; top: 0; left: 0; z-index: -1; }

/* --- 2. 导航栏：机械感与对比度增强 (保持原有的激光线和 Scrolled 逻辑) --- */

.glass-nav {
    position: fixed;
    top: 0;
    width: 100%;
    height: 80px;
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    background: transparent;
    /* 基础分割线：极淡的半透明线 */
    border-bottom: 1px solid rgba(var(--accent-rgb), 0.08);
}

/* 导航栏滚动后的状态 */
.glass-nav.scrolled {
    height: 60px;
    background: rgba(var(--bg-1-rgb), 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    /* 滚动后边框加深，确保完全切开背景 */
    border-bottom: 1px solid rgba(var(--accent-rgb), 0.2);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

/* 激光扫描特效线：在滚动后激活并在底部流动 */
.glass-nav::after {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        var(--accent) 50%, 
        transparent 100%
    );
    background-size: 200% 100%;
    animation: laserScan 4s linear infinite;
    opacity: 0; /* 默认隐藏 */
    transition: opacity 0.5s;
}

.glass-nav.scrolled::after {
    opacity: 0.6; /* 滚动后显示流动的激光线 */
}

@keyframes laserScan {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 侧边机械感角标 */
.nav-inner {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.nav-inner::before {
    content: "";
    position: absolute;
    left: -40px;
    top: 50%;
    transform: translateY(-50%) rotate(-90deg);
    font-family: 'Fira Code';
    font-size: 8px;
    letter-spacing: 1px;
    opacity: 0;
    transition: all 0.5s;
    color: var(--accent);
}

.glass-nav.scrolled .nav-inner::before {
    opacity: 0.4;
    left: -25px; /* 滚动后滑入 */
}

.logo { 
    font-family: 'Fira Code'; 
    font-weight: 700; 
    cursor: pointer; 
    letter-spacing: 1px; 
    position: relative;
}

/* Logo 下方的动态装饰线 */
.logo::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 12px;
    height: 2px;
    background: var(--accent);
    transition: width 0.4s;
}

.glass-nav.scrolled .logo::after {
    width: 100%;
}

.links a { 
    text-decoration: none; 
    color: var(--text-dim); 
    font-family: 'Fira Code'; 
    font-size: 12px; 
    margin-left: 30px; 
    transition: color 0.3s;
}
.links a:hover { color: var(--text-main); }

/* --- 【新增】3. 悬浮搜索按钮 (带呼吸灯效果) --- */
.search-trigger {
    position: fixed;
    right: 30px;
    bottom: 110px; /* 避开切换模式的按钮 (mode 按钮通常在 30px) */
    background: rgba(var(--bg-1-rgb), 0.6); /* 半透明 */
    border: 1px solid var(--border-dim);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    cursor: pointer;
    z-index: 999;
    backdrop-filter: blur(15px); -webkit-backdrop-filter: blur(15px);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    /* 挂载呼吸灯动画 */
    animation: triggerPulse 1.8s ease-in-out infinite;
}

/* 悬浮时的状态：停止动画，变为实体感 */
.search-trigger:hover {
    animation: none; /* 悬浮时停止呼吸 */
    background: var(--text-main);
    color: var(--bg-1);
    border-color: var(--text-main);
    transform: translateX(-5px) scale(1.02); /* 稍微左移并放大 */
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3); /* 增加实体阴影 */
}

/* 呼吸灯动画定义 */
@keyframes triggerPulse {
    0%, 100% { border-color: rgba(var(--accent-rgb), 0.2); box-shadow: 0 0 0 0 rgba(var(--accent-rgb), 0); }
    50% { border-color: rgba(var(--accent-rgb), 0.8); box-shadow: 0 0 20px 2px rgba(var(--accent-rgb), 0.3); }
}

.cmd-icon { font-family: 'Fira Code'; font-weight: bold; margin-right: 12px; color: var(--accent); transition: color 0.3s; }
.search-trigger:hover .cmd-icon { color: var(--bg-1); }
.cmd-text { font-family: 'Fira Code'; font-size: 11px; letter-spacing: 2px; text-transform: uppercase; opacity: 0.8; }

/* --- 【新增】4. 全屏搜索遮罩层 (终端特工风格) --- */
.search-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(var(--bg-1-rgb), 0.98); /* 极高不透明度 */
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    z-index: 2000; display: none; /* 初始隐藏 */
    padding: 8% 5%; overflow-y: auto;
}
.search-overlay.active { display: block; animation: fadeInSearch 0.3s ease; }

.search-content { max-width: 1200px; margin: 0 auto; }
.search-header { display: flex; align-items: center; border-bottom: 2px solid var(--accent); padding-bottom: 10px; margin-bottom: 50px; }
.terminal-prompt { font-family: 'Fira Code'; color: var(--accent); margin-right: 15px; }

#search-input {
    flex: 1; background: transparent; border: none;
    color: var(--text-main); font-family: 'Fira Code'; font-size: 24px;
    outline: none; caret-color: var(--accent);
}

.close-search { font-family: 'Fira Code'; font-size: 12px; cursor: pointer; opacity: 0.5; transition: opacity 0.3s; }
.close-search:hover { opacity: 1; color: #ff4444; }

@keyframes fadeInSearch { from { opacity: 0; } to { opacity: 1; } }

/* --- 5. Post Card：放大 + 变色特效 (保持原样) --- */
.container { max-width: 1200px; margin: 120px auto; padding: 0 5%; }
.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(350px, 1fr)); gap: 30px; }

.post-card {
    background: var(--card-bg);
    border: 1px solid var(--border-dim);
    padding: 40px;
    text-decoration: none; color: inherit;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    display: block; position: relative;
}

/* 核心：Hover 时放大、变色 */
.post-card:hover {
    transform: translateY(-10px) scale(1.03); /* 放大 */
    background: var(--text-main);           /* 背景变为主色 */
    color: var(--bg-1);                     /* 文字变为背景色 */
    border-color: var(--text-main);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.2);
}

.card-tag { font-family: 'Fira Code'; font-size: 10px; opacity: 0.5; margin-bottom: 20px; }
.post-card h2 { font-size: 24px; font-weight: 700; margin: 15px 0; line-height: 1.2; }

.line-divider { 
    height: 1px; width: 30px; background: var(--text-dim); 
    margin: 20px 0; transition: width 0.5s; 
}
.post-card:hover .line-divider { width: 60px; background: var(--bg-1); }

/* --- 6. 模式切换按钮 (保持原样) --- */
.theme-toggle {
    position: fixed; bottom: 30px; right: 30px; width: 48px; height: 48px; border-radius: 50%;
    background: var(--text-main); color: var(--bg-1); border: none; cursor: pointer; z-index: 2000;
    display: flex; align-items: center; justify-content: center; font-family: 'Fira Code'; font-size: 10px; font-weight: bold;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2); transition: transform 0.3s;
}
.theme-toggle:active { transform: scale(0.9); }

/* 英雄区标题 (保持原样，Glitcth 视觉效果在这) */
.hero-section { margin-bottom: 80px; }
.glitch-text { font-size: 72px; font-weight: 700; letter-spacing: -5px; }
.subtitle { font-family: 'Fira Code'; opacity: 0.5; margin-top: 10px; }

/* 适配移动端 (无损合并) */
@media (max-width: 768px) {
    .container { margin-top: 100px; padding: 0 20px; }
    .glitch-text { font-size: 48px; letter-spacing: -2px; }
    .post-grid { grid-template-columns: 1fr; }
    
    .search-trigger { right: 20px; bottom: 100px; padding: 10px 18px; animation-duration: 2s; }
    #search-input { font-size: 18px; }
}