:root {
    --teal: #39c5bb;
    --teal-dim: rgba(57,197,187,0.15);
    --teal-glow: rgba(57,197,187,0.3);
    
    --bg: #f9fafb;       /* 清爽的浅灰背景 */
    --bg2: #f3f4f6;      /* 代码块等次级背景 */
    --card-bg: rgba(255, 255, 255, 0.85);
    
    --text: #1f2937;     /* 深色主文本，保证阅读体验 */
    --text-muted: #4b5563; 
    --text-dim: #9ca3af;   
    
    --border: rgba(57,197,187,0.3);
    --border-hover: rgba(57,197,187,0.6);
    
    --grid-line: rgba(0, 0, 0, 0.03); /* 浅色模式下的低调网格 */
    --glow-radial: rgba(57,197,187,0.08); /* 浅色模式下的微光晕 */
}


.dark {
    --teal: #39c5bb;     /* 保持核心主题色不变 */
    --teal-dim: rgba(57,197,187,0.12);
    --teal-glow: rgba(57,197,187,0.25);
    
    --bg: #0d1117;       /* 你的极致暗黑背景 */
    --bg2: #131920;      
    --card-bg: rgba(20, 32, 44, 0.85); 
    
    --text: #e8f4f3;     /* 赛博风格的高对比浅色文本 */
    --text-muted: #7a9e9b; 
    --text-dim: #4a6b68;   
    
    --border: rgba(57,197,187,0.15);
    --border-hover: rgba(57,197,187,0.45);
    
    --grid-line: rgba(57,197,187,0.03); /* 暗黑模式下的青色网格 */
    --glow-radial: rgba(57,197,187,0.07); /* 暗黑模式下的环境光 */
}


body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'DM Sans', sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    /* 核心：让颜色切换时拥有半秒的呼吸感过渡 */
    transition: background-color 0.5s ease, color 0.5s ease;
}

body::before {
    content: ''; position: fixed; inset: 0;
    background: radial-gradient(ellipse 60% 50% at 15% 20%, var(--glow-radial) 0%, transparent 60%),
                radial-gradient(ellipse 40% 40% at 85% 75%, var(--glow-radial) 0%, transparent 55%);
    pointer-events: none; z-index: -1;
    transition: background 0.5s ease;
}

body::after {
    content: ''; position: fixed; inset: 0;
    background-image: linear-gradient(var(--grid-line) 1px, transparent 1px),
                      linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none; z-index: -1;
    transition: background-image 0.5s ease;
}


.post-content {
    font-size: 1.05rem;
    letter-spacing: 0.01em;
}

.post-content h2, .post-content h3 {
    font-family: 'Playfair Display', serif;
    color: var(--teal);
    margin: 2rem 0 1rem;
    transition: color 0.5s ease;
}

.post-content p { 
    margin-bottom: 1.5rem; 
}

.post-content blockquote {
    border-left: 3px solid var(--teal);
    background: var(--teal-dim);
    padding: 1rem 1.5rem;
    margin: 2rem 0;
    border-radius: 0 12px 12px 0;
    color: var(--text-muted);
    transition: background-color 0.5s ease, color 0.5s ease;
}

.post-content img {
    border-radius: 14px;
    border: 1px solid var(--border);
    margin: 2rem 0;
    transition: border-color 0.5s ease;
}

.post-content code {
    background: var(--bg2);
    padding: 0.2rem 0.4rem;
    border-radius: 6px;
    font-size: 0.9em;
    color: var(--teal);
    transition: background-color 0.5s ease;
}

.pagination {
    margin-top: 3rem;
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
}

.pagination li a, .pagination li span {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--card-bg);
    color: var(--text-muted);
    transition: all 0.3s ease;
    text-decoration: none;
    backdrop-filter: blur(8px);
}

.pagination li.current a, 
.pagination li a:hover {
    border-color: var(--teal);
    background: var(--teal-dim);
    color: var(--teal);
    box-shadow: 0 0 15px var(--teal-glow);
    transform: translateY(-2px);
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

.post-card {
    animation: fadeUp 0.6s ease both;
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    transition: background-color 0.5s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px var(--teal-glow);
}