*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f5f5f5;
  --card-bg: #fff;
  --text: #333;
  --text-secondary: #888;
  --border: #e0e0e0;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.15);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header h1 { font-size: 20px; font-weight: 600; }
.admin-link {
  color: var(--text-secondary); text-decoration: none; font-size: 14px;
  padding: 6px 12px; border-radius: 6px; transition: all .2s;
}
.admin-link:hover { background: var(--bg); color: var(--text); }

.container { max-width: 1200px; margin: 0 auto; padding: 24px; }

/* 分组堆叠 */
.groups-stack {
  display: flex; flex-direction: column; gap: 40px;
}
.group-section-header {
  display: flex; align-items: baseline; gap: 12px; margin-bottom: 16px;
}
.group-section-header h2 { font-size: 18px; font-weight: 600; }
.group-section-header span { font-size: 13px; color: var(--text-secondary); }

/* 照片网格 */
.gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  align-items: center;
}
.photo-card {
  background: var(--card-bg); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
  cursor: pointer; transition: transform .2s, box-shadow .2s;
  display: flex; align-items: center;
}
.photo-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.photo-card img { width: 100%; display: block; }

.empty-state {
  text-align: center; padding: 60px 20px; color: var(--text-secondary); font-size: 15px;
  grid-column: 1 / -1;
}

/* 灯箱 */
.lightbox {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.9); z-index: 200;
  flex-direction: column; align-items: center; justify-content: center;
}
.lightbox.active { display: flex; }
.lightbox img { max-width: 90vw; max-height: 85vh; object-fit: contain; border-radius: 8px; }
.lightbox-close {
  position: absolute; top: 20px; right: 30px;
  background: none; border: none; color: #fff; font-size: 36px; cursor: pointer; line-height: 1;
}

/* 按钮 */
.btn {
  padding: 10px 24px; border: none; border-radius: 8px;
  font-size: 14px; font-weight: 500; cursor: pointer; transition: all .2s;
}
.btn-sm { padding: 6px 14px; font-size: 13px; border-radius: 6px; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-cancel { background: var(--bg); color: var(--text); }
.btn-cancel:hover { background: var(--border); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: var(--bg); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger-hover); }

/* 登录 */
.login-section { max-width: 400px; margin: 60px auto 0; }
.login-card {
  background: var(--card-bg); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 32px; text-align: center;
}
.login-card h2 { font-size: 20px; margin-bottom: 24px; }
.password-input {
  width: 100%; padding: 12px 16px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 15px; outline: none; margin-bottom: 12px;
}
.password-input:focus { border-color: var(--primary); }
.login-error { color: var(--danger); font-size: 13px; margin-bottom: 12px; min-height: 20px; }

/* 管理布局 */
.admin-layout { display: flex; gap: 24px; align-items: flex-start; }
.admin-sidebar {
  width: 200px; flex-shrink: 0;
  background: var(--card-bg); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
  display: flex; flex-direction: column;
}
.sidebar-top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px; border-bottom: 1px solid var(--border);
}
.sidebar-top h3 { font-size: 13px; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: .5px; }
.group-list { list-style: none; padding: 8px; max-height: 440px; overflow-y: auto; flex: 1; }
.group-list li {
  padding: 10px 12px; border-radius: 8px; cursor: pointer;
  font-size: 14px; transition: all .12s; margin-bottom: 2px;
  display: flex; align-items: center; justify-content: space-between;
}
.group-list li:hover { background: #f0f0f0; }
.group-list li.active { background: #eef2ff; color: var(--primary); font-weight: 500; }
.group-badge {
  font-size: 11px; font-weight: 500;
  color: var(--text-secondary); background: #f0f0f0;
  min-width: 20px; height: 20px; line-height: 20px; text-align: center;
  padding: 0 6px; border-radius: 10px;
}
.group-list li.active .group-badge { background: #c7d2fe; color: var(--primary); }
.group-list li.dragging { opacity: 0.4; background: var(--border); }
.group-empty {
  color: var(--text-secondary) !important; font-size: 13px !important;
  text-align: center; padding: 24px 12px !important; cursor: default !important;
}
.group-empty:hover { background: transparent !important; }
.group-name-input {
  width: 100%; padding: 10px 14px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 14px; outline: none; background: var(--bg);
}
.group-name-input:focus { border-color: var(--primary); background: #fff; }
.header-actions { display: flex; align-items: center; gap: 10px; }

.logout-btn {
  padding: 6px 16px; border: 1px solid var(--border); border-radius: 6px;
  background: transparent; color: var(--text-secondary); font-size: 13px;
  cursor: pointer; transition: all .15s;
}
.logout-btn:hover { color: var(--danger); border-color: var(--danger); background: #fef2f2; }

.admin-entry-btn {
  color: var(--text-secondary); text-decoration: none; font-size: 13px;
  padding: 6px 16px; border: 1px solid var(--border); border-radius: 6px;
  transition: all .15s;
}
.admin-entry-btn:hover { color: var(--primary); border-color: var(--primary); }

.admin-main { flex: 1; min-width: 0; }
.select-group-hint {
  text-align: center; padding: 80px 20px; color: var(--text-secondary);
}
.group-content h2 { margin-bottom: 0; }
.group-toolbar {
  display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px;
}
.group-toolbar h2 { font-size: 18px; }

/* 上传区 */
.upload-dropzone {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 30px 20px; cursor: pointer; transition: all .2s;
  background: var(--card-bg); margin-bottom: 16px;
}
.upload-dropzone:hover, .upload-dropzone.drag-over { border-color: var(--primary); background: #eef2ff; }
.upload-icon { color: var(--text-secondary); margin-bottom: 8px; }
.upload-text { font-size: 15px; font-weight: 500; }
.upload-hint { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }

/* 上传队列 */
.upload-queue { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.upload-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--card-bg); padding: 10px 16px; border-radius: 8px;
  box-shadow: var(--shadow);
}
.upload-item-name { flex: 1; font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.upload-item-progress { height: 4px; border-radius: 2px; background: var(--border); width: 120px; flex-shrink: 0; }
.upload-item-bar { height: 100%; border-radius: 2px; background: var(--primary); transition: width .3s; }
.upload-item-status { font-size: 12px; flex-shrink: 0; width: 50px; text-align: right; }
.upload-item-status.done { color: #16a34a; }
.upload-item-status.error { color: var(--danger); }

/* 管理网格 */
.admin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}
.admin-card {
  position: relative; background: var(--card-bg);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
}
.admin-card img { width: 100%; height: 140px; object-fit: cover; display: block; }
.admin-card-delete {
  position: absolute; top: 6px; right: 6px;
  width: 28px; height: 28px; border-radius: 50%;
  background: rgba(220,38,38,.85); color: #fff;
  border: none; font-size: 16px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity .2s;
}
.admin-card:hover .admin-card-delete { opacity: 1; }
.admin-card-delete:hover { background: var(--danger); }

/* 弹窗 */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.4);
  z-index: 150; display: flex; align-items: center; justify-content: center;
}
.modal-card {
  background: var(--card-bg); border-radius: var(--radius);
  padding: 32px; max-width: 400px; width: 90%; box-shadow: var(--shadow-lg);
}
.modal-card h3 { margin-bottom: 12px; }
.modal-card p { color: var(--text-secondary); font-size: 14px; margin-bottom: 24px; }
.modal-actions { display: flex; gap: 12px; justify-content: flex-end; }

/* 响应式 */
@media (max-width: 768px) {
  .container { padding: 12px; }
  .gallery { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .photo-card img { height: 140px; }
  .admin-layout { flex-direction: column; }
  .admin-sidebar { width: 100%; }
  .group-list { max-height: 200px; }
  .admin-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; }
  .admin-card img { height: 120px; }
}