:root {
  color-scheme: light;
  --bg: #f5f7f8;
  --panel: #ffffff;
  --text: #172026;
  --muted: #66737f;
  --line: #dce3e8;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --accent-soft: #e4f4f2;
  --danger: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "Segoe UI", Arial, "Microsoft YaHei", sans-serif;
}

button,
input {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

.hidden {
  display: none !important;
}

.login {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(420px, 100%);
  padding: 28px;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 8px;
  box-shadow: 0 16px 45px rgba(23, 32, 38, 0.08);
}

.login-panel h1,
.toolbar h1 {
  margin: 4px 0 20px;
  font-size: 24px;
}

.eyebrow {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0;
}

.login-panel input,
.image-search input,
.new-folder-form input {
  width: 100%;
  height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.login-panel input {
  margin-bottom: 12px;
}

.login-panel button,
.upload-btn {
  width: 100%;
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
  text-align: center;
}

.error {
  min-height: 20px;
  color: var(--danger);
}

.app {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 320px 1fr;
}

.sidebar {
  border-right: 1px solid var(--line);
  background: #ffffff;
  padding: 18px;
  overflow: auto;
}

.brand,
.toolbar,
.actions,
.image-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand {
  justify-content: space-between;
  margin-bottom: 14px;
}

.brand button {
  padding: 7px 10px;
}

.tree-search {
  margin-bottom: 14px;
}

.tree-search input {
  width: 100%;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  background: #f8fafb;
}

.tree {
  position: relative;
}

.tree-row {
  position: relative;
  display: flex;
  width: 100%;
  align-items: center;
  gap: 4px;
  min-height: 36px;
  margin: 2px 0;
  padding-left: var(--indent);
}

.tree-row::before {
  content: "";
  position: absolute;
  left: calc(4px + var(--indent));
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 999px;
  background: #d7e1e6;
  opacity: var(--line-opacity);
}

.tree-toggle {
  flex: 0 0 26px;
  height: 30px;
  padding: 0;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  line-height: 30px;
}

.tree-toggle:disabled {
  cursor: default;
  opacity: 0.3;
}

.tree-item {
  display: flex;
  min-width: 0;
  flex: 1;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  height: 34px;
  padding: 0 8px;
  border: 0;
  border-radius: 8px;
  text-align: left;
  background: transparent;
}

.tree-item:hover {
  background: #f3f7f8;
}

.tree-row.active .tree-item {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.tree-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tree-count {
  flex: 0 0 auto;
  min-width: 26px;
  border: 1px solid #cdd9de;
  border-radius: 999px;
  padding: 2px 7px;
  background: #fff;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
  text-align: center;
}

.tree-row.active .tree-count {
  border-color: #99d1ca;
  color: var(--accent-strong);
}

.tree-empty {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.workspace {
  padding: 24px;
  overflow: auto;
}

.toolbar {
  justify-content: space-between;
  margin-bottom: 14px;
}

.actions {
  flex-wrap: wrap;
  justify-content: flex-end;
}

.new-folder-form {
  display: grid;
  grid-template-columns: minmax(240px, 340px) auto;
  gap: 8px;
}

.new-folder-form button {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.upload-btn {
  display: inline-flex;
  width: auto;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
}

.upload-btn input {
  display: none;
}

.image-search {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto;
  gap: 10px;
  margin-bottom: 16px;
}

.drop-zone {
  display: grid;
  place-items: center;
  min-height: 96px;
  margin-bottom: 26px;
  border: 1px dashed #9fb3be;
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
}

.drop-zone.dragging {
  border-color: var(--accent);
  background: #e4f4f2;
  color: var(--accent-strong);
}

.upload-progress {
  margin-top: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 16px;
}

.upload-progress-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.upload-progress-head h2 {
  margin-bottom: 4px;
}

.upload-progress-head span {
  color: var(--muted);
  font-size: 13px;
}

.upload-progress-head strong {
  color: var(--accent-strong);
  font-size: 20px;
}

.progress-track {
  overflow: hidden;
  height: 8px;
  border-radius: 999px;
  background: #edf2f4;
}

.progress-bar {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 160ms ease;
}

.upload-file-list {
  display: grid;
  gap: 8px;
  max-height: 220px;
  margin-top: 14px;
  overflow: auto;
}

.upload-file {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: #f8fafb;
}

.upload-file-main {
  display: grid;
  min-width: 0;
  gap: 3px;
}

.upload-file-main strong,
.upload-file-main span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.upload-file-main span {
  color: var(--muted);
  font-size: 12px;
}

.upload-file-status {
  flex: 0 0 auto;
  border: 1px solid #cdd9de;
  border-radius: 999px;
  padding: 3px 8px;
  color: var(--muted);
  font-size: 12px;
}

.upload-file.uploading .upload-file-status {
  border-color: #99d1ca;
  color: var(--accent-strong);
}

.upload-file.done .upload-file-status {
  border-color: #99d1ca;
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.upload-file.failed .upload-file-status {
  border-color: #f3b7b0;
  color: var(--danger);
}

section h2 {
  margin: 0;
  font-size: 16px;
}

section {
  margin-top: 24px;
}

#foldersSection h2 {
  margin-bottom: 12px;
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.section-heading span {
  color: var(--muted);
  font-size: 13px;
}

.folder-grid,
.image-grid {
  display: grid;
  gap: 12px;
}

.folder-grid {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}

.folder-card {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 54px;
  text-align: left;
  background: #fff;
}

.folder-icon {
  color: var(--accent);
  font-size: 18px;
}

.folder-main {
  display: grid;
  min-width: 0;
  gap: 3px;
}

.folder-name,
.folder-count {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.folder-count {
  color: var(--muted);
  font-size: 12px;
}

.image-grid {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

.image-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.thumb {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  border: 0;
  border-radius: 0;
  background-size: cover;
  background-position: center;
}

.image-meta {
  padding: 12px;
}

.image-meta strong,
.image-meta span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.image-meta span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.image-actions {
  flex-wrap: wrap;
  padding: 0 12px 12px;
}

.image-actions button {
  padding: 7px 9px;
  font-size: 13px;
}

.upload-result {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 20;
  width: min(520px, calc(100vw - 44px));
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 18px 55px rgba(23, 32, 38, 0.16);
  padding: 16px;
}

.upload-result-head,
.upload-result-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.upload-result-head button {
  padding: 7px 10px;
}

.upload-result p {
  margin: 8px 0 12px;
  color: var(--muted);
}

.upload-result label {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.upload-result textarea {
  width: 100%;
  min-height: 112px;
  margin-top: 6px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  color: var(--text);
  font: 13px/1.5 Consolas, "SFMono-Regular", monospace;
}

.upload-result-actions {
  justify-content: flex-end;
  flex-wrap: wrap;
  margin-top: 12px;
}

.context-menu {
  position: fixed;
  z-index: 40;
  min-width: 132px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 14px 38px rgba(23, 32, 38, 0.16);
  padding: 6px;
}

.context-menu button {
  width: 100%;
  border: 0;
  color: var(--danger);
  text-align: left;
  background: transparent;
}

.context-menu button:hover {
  background: #fff1ef;
}

.dialog-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(23, 32, 38, 0.36);
}

.dialog {
  width: min(460px, 100%);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 22px 70px rgba(23, 32, 38, 0.22);
  padding: 22px;
}

.dialog h2 {
  margin: 4px 0 10px;
  font-size: 20px;
}

.dialog p {
  color: var(--muted);
  line-height: 1.7;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

.danger-btn {
  border-color: var(--danger);
  background: var(--danger);
  color: #fff;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 70;
  transform: translateX(-50%);
  max-width: calc(100vw - 32px);
  border: 1px solid #99d1ca;
  border-radius: 8px;
  background: #ffffff;
  color: var(--accent-strong);
  box-shadow: 0 14px 38px rgba(23, 32, 38, 0.16);
  padding: 10px 14px;
  font-size: 14px;
}

.toast.error {
  border-color: #f3b7b0;
  color: var(--danger);
}

@media (max-width: 820px) {
  .app {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    max-height: 240px;
  }

  .toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .actions {
    justify-content: flex-start;
  }

  .new-folder-form {
    width: 100%;
    grid-template-columns: 1fr;
  }

  .image-search {
    grid-template-columns: 1fr;
  }

  .upload-result {
    right: 12px;
    bottom: 12px;
    width: calc(100vw - 24px);
  }
}