* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Microsoft YaHei", "Segoe UI", Helvetica, Arial, sans-serif;
  background: #f4f5f7;
  color: #333;
}
a { color: #2a6fb5; text-decoration: none; }
a:hover { text-decoration: underline; }

/* 顶栏 */
.topbar { background: #3b5172; color: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.15); }
.topbar-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 24px;
  height: 64px; display: flex; align-items: center; justify-content: space-between;
}
.brand { font-size: 24px; font-weight: 700; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a { color: #e8edf4; }
.nav a:hover { color: #fff; }
.welcome { color: #cdd6e4; }
.inline { display: inline; margin: 0; }
.linklike { background: none; border: none; color: #e8edf4; cursor: pointer; font-size: 16px; padding: 0; }
.linklike:hover { color: #fff; }

/* 容器 */
.container { max-width: 1280px; margin: 24px auto; padding: 0 24px; }

/* 提示 */
.flash { padding: 12px 16px; border-radius: 6px; margin-bottom: 16px; font-size: 14px; }
.flash-success { background: #e6f7ec; color: #1f8a4c; border: 1px solid #b7e4c7; }
.flash-error { background: #fdecea; color: #c0392b; border: 1px solid #f5c6cb; }

/* 配额 */
.quota-box {
  background: #fbfbfc; border: 1px solid #e6e8eb; border-left: 4px solid #3b5172;
  border-radius: 6px; padding: 18px 22px; margin-bottom: 20px;
}
.quota-label { color: #555; margin-bottom: 12px; }
.quota-bar { background: #e9ecef; border-radius: 20px; height: 16px; overflow: hidden; }
.quota-fill { background: #27ae60; height: 100%; border-radius: 20px; transition: width .3s; }

/* 工具栏 */
.toolbar { display: flex; gap: 12px; margin-bottom: 20px; }

/* 按钮 */
.btn {
  display: inline-block; border: none; border-radius: 6px; cursor: pointer;
  font-size: 15px; padding: 10px 18px; color: #fff; background: #4a89dc; text-align: center;
}
.btn:hover { opacity: .9; text-decoration: none; }
.btn-primary { background: #4a89dc; }
.btn-danger { background: #e74c3c; }
.btn-default { background: #eef0f2; color: #333; border: 1px solid #d6d9dd; }
.btn-default:hover { background: #e2e5e9; }
.btn-sm { padding: 8px 16px; font-size: 14px; }
.btn-xs { padding: 4px 10px; font-size: 12px; }
.btn-block { display: block; width: 100%; }

/* 面板 */
.panel { background: #fff; border: 1px solid #eceef0; border-radius: 8px; padding: 8px 24px; }
.breadcrumb { padding: 16px 0; border-bottom: 1px solid #eee; display: flex; align-items: center; gap: 10px; }
.breadcrumb .sep { color: #aaa; }
.folder-name { font-weight: 600; }

.folder-row { padding: 16px 4px; border-bottom: 1px solid #f0f0f0; font-size: 16px; }
.folder-row a { font-weight: 600; }

.empty { padding: 48px 0; text-align: center; color: #999; }

/* 文件行 */
.file-row {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 16px;
  padding: 20px 4px; border-bottom: 1px solid #f0f0f0;
}
.file-row:last-child { border-bottom: none; }
.file-main { min-width: 0; flex: 1; }
.file-head { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
.file-name { font-size: 17px; font-weight: 700; }
.file-size { color: #888; font-size: 14px; }
.file-meta { color: #666; font-size: 14px; margin-top: 4px; word-break: break-all; }
.dl-count strong { color: #e74c3c; }
.share-link { word-break: break-all; }

.file-actions { display: flex; gap: 10px; flex-shrink: 0; align-items: flex-start; }

/* 弹窗 */
.modal-overlay {
  display: none; position: fixed; inset: 0; background: rgba(40,50,65,.55);
  z-index: 1000; align-items: center; justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal {
  background: #fff; border-radius: 10px; padding: 32px; width: 520px; max-width: calc(100vw - 32px);
  box-shadow: 0 12px 40px rgba(0,0,0,.25);
}
.modal h3 { margin: 0 0 20px; font-size: 20px; }
.modal-label { display: block; font-weight: 600; margin: 16px 0 8px; }
.modal input[type="text"], .modal input[type="file"] {
  width: 100%; padding: 10px 12px; border: 1px solid #d6d9dd; border-radius: 6px; font-size: 14px;
}
.modal-actions { margin-top: 24px; display: flex; gap: 12px; }
.hint { color: #999; font-size: 13px; margin: 8px 0 0; }

/* 登录 / 注册 */
.auth-card {
  background: #fff; border: 1px solid #eceef0; border-radius: 10px; padding: 32px;
  max-width: 380px; margin: 48px auto;
}
.auth-card h2 { margin: 0 0 20px; }
.auth-card label { display: block; font-weight: 600; margin: 14px 0 6px; }
.auth-card input { width: 100%; padding: 10px 12px; border: 1px solid #d6d9dd; border-radius: 6px; font-size: 14px; }
.auth-card .btn-block { margin-top: 22px; }
.auth-switch { margin-top: 18px; color: #666; }

/* 分享页 */
.share-card {
  background: #fff; border: 1px solid #eceef0; border-radius: 10px; padding: 32px;
  max-width: 560px; margin: 48px auto;
}
.share-card h2 { margin: 0 0 20px; word-break: break-all; }
.share-info { margin-bottom: 24px; }
.share-info > div { padding: 8px 0; border-bottom: 1px dashed #eee; word-break: break-all; }
.share-info .k { color: #888; display: inline-block; min-width: 84px; }
code { background: #f2f3f5; padding: 2px 8px; border-radius: 4px; font-size: 14px; }