/* CSS reset */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: #0f0f0f; color: #e0e0e0; }
a { color: #4a9eff; text-decoration: none; }
img { display: block; max-width: 100%; }

/* Header */
.header { padding: 20px; text-align: center; position: sticky; top: 0; background: rgba(15,15,15,0.95); backdrop-filter: blur(10px); z-index: 100; border-bottom: 1px solid #222; }
.logo { font-size: 28px; font-weight: 700; color: #fff; letter-spacing: 2px; }
.subtitle { color: #888; font-size: 14px; margin-top: 4px; }
.back-link { float: left; color: #4a9eff; font-size: 14px; line-height: 28px; }

/* Masonry 瀑布流 */
.masonry { column-count: 4; column-gap: 12px; padding: 16px; }
@media (max-width: 1200px) { .masonry { column-count: 3; } }
@media (max-width: 768px) { .masonry { column-count: 2; } }
@media (max-width: 480px) { .masonry { column-count: 1; } }

.masonry-item { break-inside: avoid; margin-bottom: 12px; position: relative; cursor: pointer; overflow: hidden; border-radius: 8px; }
.masonry-item img { width: 100%; height: auto; transition: transform 0.3s; }
.masonry-item:hover img { transform: scale(1.03); }

.loader { text-align: center; padding: 40px; color: #666; }

/* Detail page */
.detail-container { max-width: 900px; margin: 0 auto; padding: 24px; }
.detail-image { width: 100%; border-radius: 12px; margin-bottom: 20px; }
.detail-name { font-size: 22px; font-weight: 600; color: #fff; margin-bottom: 16px; }
.detail-actions { margin-bottom: 20px; }
.download-btn { display: inline-block; padding: 12px 32px; background: #4a9eff; color: #fff; border: none; border-radius: 8px; font-size: 16px; cursor: pointer; transition: background 0.2s; }
.download-btn:hover { background: #3a8eef; }
.detail-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-link { padding: 6px 16px; background: #1e1e1e; border: 1px solid #333; border-radius: 20px; color: #aaa; font-size: 14px; cursor: pointer; transition: all 0.2s; }
.tag-link:hover { background: #2a2a2a; color: #4a9eff; }

/* Login page */
.login-container { max-width: 360px; margin: 80px auto; text-align: center; padding: 32px; background: #1a1a1a; border-radius: 12px; }
.login-container h2 { color: #fff; margin-bottom: 24px; }
.login-container input { width: 100%; padding: 12px 16px; background: #0f0f0f; border: 1px solid #333; border-radius: 8px; color: #fff; font-size: 16px; margin-bottom: 16px; }
.login-container button { width: 100%; padding: 12px; background: #4a9eff; color: #fff; border: none; border-radius: 8px; font-size: 16px; cursor: pointer; }
.login-container button:hover { background: #3a8eef; }
.msg { color: #ff6b6b; font-size: 14px; margin-top: 12px; min-height: 20px; }

/* Admin page */
.admin-header { display: flex; justify-content: space-between; align-items: center; }
.upload-section { max-width: 700px; margin: 24px auto; padding: 0 16px; }
.drop-zone { border: 2px dashed #333; border-radius: 12px; padding: 60px 20px; text-align: center; color: #666; transition: all 0.3s; cursor: pointer; }
.drop-zone.dragover { border-color: #4a9eff; background: rgba(74,158,255,0.05); color: #4a9eff; }
.drop-zone p { margin-bottom: 4px; }
.drop-zone .small { font-size: 12px; color: #555; }

.upload-pending { background: #1a1a1a; border-radius: 12px; padding: 20px; margin-top: 16px; text-align: center; }
.pending-preview { max-width: 300px; max-height: 200px; border-radius: 8px; margin: 0 auto 16px; }
.upload-pending input { width: 100%; padding: 10px 14px; background: #0f0f0f; border: 1px solid #333; border-radius: 8px; color: #fff; font-size: 14px; margin-bottom: 12px; }
.upload-pending button { padding: 10px 24px; background: #4a9eff; color: #fff; border: none; border-radius: 8px; cursor: pointer; margin: 0 4px; }
.upload-pending .btn-cancel { background: #333; }

.manage-section { max-width: 900px; margin: 24px auto; padding: 0 16px; }
.manage-section h2 { color: #fff; margin-bottom: 16px; }
.admin-list { display: flex; flex-direction: column; gap: 12px; }
.admin-item { display: flex; gap: 16px; align-items: center; background: #1a1a1a; border-radius: 8px; padding: 12px; }
.admin-item img { width: 100px; height: 70px; object-fit: cover; border-radius: 6px; flex-shrink: 0; }
.admin-item-info { flex: 1; }
.admin-item-name { color: #fff; font-size: 14px; margin-bottom: 4px; }
.admin-item-tags { color: #888; font-size: 12px; }
.admin-item-actions { display: flex; gap: 8px; }
.admin-item-actions button { padding: 6px 12px; border: none; border-radius: 6px; cursor: pointer; font-size: 12px; }
.btn-edit { background: #2a4a6a; color: #8af; }
.btn-delete { background: #4a2a2a; color: #f88; }