body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    max-width: 880px;
    margin: 32px auto;
    padding: 0 20px;
    background: #f8fafc;
    color: #0f172a;
}
h1 {
    font-weight: 600;
    font-size: 1.8rem;
    margin-bottom: 0;
}
.sub {
    color: #64748b;
    margin-top: 4px;
}
hr {
    border: none;
    border-top: 2px solid #e2e8f0;
    margin: 18px 0;
}
ul {
    list-style: none;
    padding-left: 24px;
    margin: 0;
}
li {
    margin: 3px 0;
}
.folder {
    cursor: pointer;
    font-weight: 500;
    color: #0f172a;
    padding: 4px 8px;
    border-radius: 6px;
    display: inline-block;
    user-select: none;
}
.folder:hover {
    background: #e2e8f0;
}
.file a {
    color: #2563eb;
    text-decoration: none;
    padding: 4px 8px;
    border-radius: 6px;
    display: inline-block;
}
.file a:hover {
    background: #dbeafe;
}
.hidden {
    display: none;
}
.empty-hint {
    color: #94a3b8;
    padding: 6px 12px;
    font-size: 0.9rem;
}
.toolbar {
    display: flex;
    gap: 12px;
    margin-bottom: 18px;
    flex-wrap: wrap;
    align-items: center;
}
.upload-btn {
    background: #2563eb;
    color: #fff;
    border: none;
    padding: 8px 28px;
    border-radius: 30px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: 0.15s;
}
.upload-btn:hover {
    background: #1d4ed8;
    transform: scale(1.02);
}
.footer {
    margin-top: 28px;
    color: #94a3b8;
    font-size: 0.85rem;
    border-top: 1px solid #e2e8f0;
    padding-top: 18px;
    text-align: center;
}
.footer a {
    color: #2563eb;
    text-decoration: none;
}