* {
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
                 Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
    margin: 0;
    background: #0b0d12;
    color: #fff;
}

/* 星空背景 */
canvas {
    position: fixed;
    inset: 0;
    z-index: 0;
}

/* 内容层 */
.container {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    padding: 40px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
}

/* 目录网格 */
.grid {
    width: 90%;
    max-width: 900px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 22px;
    margin-bottom: 60px; /* 给 footer 留空间 */
}

.card {
    background: rgba(26, 29, 36, 0.85);
    backdrop-filter: blur(6px);
    border-radius: 16px;
    padding: 28px;
    text-decoration: none;
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    transition: all 0.25s ease;
    border: 1px solid rgba(255,255,255,0.06);
}

.card:hover {
    transform: translateY(-6px);
    background: rgba(34, 38, 54, 0.9);
    border-color: #3a82f7;
    box-shadow: 0 10px 30px rgba(58,130,247,0.25);
}

.title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
}

.desc {
    font-size: 14px;
    color: #9aa0aa;
}

.url {
    margin-top: 14px;
    font-size: 13px;
    color: #3a82f7;
    word-break: break-all;
}

/* footer */
footer {
    text-align: center;
    padding: 20px 0;
    color: #fff;
    font-size: 14px;
    background: rgba(0,0,0,0.5);
    width: 100%;
}

footer a {
    color: #fff;
    text-decoration: none;
}

footer p.version {
    color: #9aa0aa;
    margin: 4px 0 0 0;
}

/* 手机端 */
@media (max-width: 640px) {
    .grid {
        grid-template-columns: 1fr;
    }
}