:root {
    --primary: #0969da;
    --bg: #f6f8fa;
    --card: #ffffff;
    --text: #1f2328;
    --muted: #636c76;
    --border: #d0d7de;
    --shadow: 0 3px 6px rgba(140, 149, 159, 0.15);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0d1117;
        --card: #161b22;
        --text: #f0f6fc;
        --muted: #8b949e;
        --border: #30363d;
        --shadow: 0 8px 24px rgba(0,0,0,0.4);
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 40px 20px;
}

/* 讓容器更寬，解決兩邊空白過多的問題 */
.container {
    max-width: 1100px;
    margin: 0 auto;
}

header {
    margin-bottom: 4rem;
    text-align: center;
}

h1 { font-size: 2.5rem; font-weight: 800; letter-spacing: -1px; }

/* 網格優化：增大間距 (Gap) 解決擠迫感 */
.grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); 
    gap: 2rem; 
}

.repo-card {
    background: var(--card);
    padding: 1.8rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: all 0.3s cubic-bezier(0.2, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
    justify-content: space-between; /* 讓內容均勻分布 */
    min-height: 180px; /* 固定最小高度，視覺更整齊 */
}

.repo-card:hover { 
    transform: translateY(-8px); 
    border-color: var(--primary);
    box-shadow: 0 12px 30px rgba(0,0,0,0.1);
}

.repo-card a { 
    color: var(--primary); 
    text-decoration: none; 
    font-weight: 600; 
    font-size: 1.3rem; 
    display: block;
    margin-bottom: 0.8rem;
}

.repo-card p { 
    font-size: 0.95rem; 
    color: var(--muted); 
    line-height: 1.6;
    margin: 0 0 1.5rem 0;
}

/* 底部數據資訊 */
.meta { 
    display: flex; 
    align-items: center;
    gap: 1.5rem;
    font-size: 0.85rem; 
    color: var(--muted); 
    font-weight: 500;
}

/* 模擬 GitHub 的語言圓點 */
.lang-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
    background-color: var(--primary);
    margin-right: 4px;
}