:root {
  --bg-base: #f5f5f5;
  --surface: #ffffff;
  --surface-subtle: #fafafa;
  --surface-hover: #f0f0f0;
  --surface-pressed: #ebebeb;
  --border-subtle: rgba(0, 0, 0, 0.06);
  --border-default: rgba(0, 0, 0, 0.12);
  
  --brand: #0f6cbd;
  --brand-hover: #115ea3;
  --brand-pressed: #0c3b5e;
  --brand-subtle: #ebf3fc;

  --text-primary: #242424;
  --text-secondary: #616161;
  --text-tertiary: #8a8a8a;
  --danger: #c42b1c;
  --success: #107c41;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.05), 0 4px 12px rgba(0, 0, 0, 0.03);
  --shadow-flyout: 0 16px 36px rgba(0, 0, 0, 0.16), 0 0 2px rgba(0, 0, 0, 0.12);
}

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

body {
  font-family: 'Roboto Flex', sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

.icon {
  font-family: 'Material Symbols Rounded';
  font-size: 20px;
  line-height: 1;
  display: inline-block;
  user-select: none;
  vertical-align: middle;
}

.fluent-tooltip {
  position: fixed;
  background: #242424;
  color: #ffffff;
  padding: 5px 9px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 500;
  line-height: 1.2;
  pointer-events: none;
  z-index: 10000;
  opacity: 0;
  transform: translateY(3px);
  transition: opacity 0.1s ease, transform 0.1s ease;
  white-space: nowrap;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.fluent-tooltip.visible { opacity: 1; transform: translateY(0); }

.fluent-header {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 24px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}

.brand-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-badge {
  font-size: 11px;
  color: var(--text-secondary);
  background: var(--surface-hover);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.main-wrapper {
  max-width: 1300px;
  width: 100%;
  margin: 20px auto;
  padding: 0 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
}

.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: 40px 20px;
}

.auth-card {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-flyout);
  width: 100%;
  max-width: 400px;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.auth-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 6px;
}

.auth-tab {
  flex: 1;
  text-align: center;
  padding: 10px 0;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.15s;
}
.auth-tab:hover { color: var(--text-primary); }
.auth-tab.active {
  color: var(--brand);
  border-bottom-color: var(--brand);
  font-weight: 600;
}

.quota-badge {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 140px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background 0.15s;
}
.quota-badge:hover { background: var(--surface-hover); }
.quota-label {
  font-size: 11px;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
}
.quota-track {
  width: 100%;
  height: 4px;
  background: rgba(0, 0, 0, 0.08);
  border-radius: 2px;
  overflow: hidden;
}
.quota-fill {
  height: 100%;
  background: var(--brand);
  border-radius: 2px;
  transition: width 0.3s;
}

.command-bar {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 8px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-card);
  flex-wrap: wrap;
  gap: 8px;
}

.command-group { display: flex; align-items: center; gap: 4px; }

.btn {
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-md);
  padding: 6px 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-primary);
  transition: all 0.15s ease;
}

.btn:hover { background: var(--surface-hover); }
.btn:active { background: var(--surface-pressed); }
.btn.active { background: var(--surface-pressed); font-weight: 600; }

.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-hover); }
.btn-primary:active { background: var(--brand-pressed); }

.search-box {
  display: flex;
  align-items: center;
  background: var(--surface-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 4px 10px;
  width: 220px;
}

.search-box:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 1px var(--brand);
  background: #fff;
}

.search-box input {
  font-family: inherit;
  border: none;
  background: transparent;
  outline: none;
  font-size: 13px;
  width: 100%;
  margin-left: 6px;
}

.breadcrumb-bar {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 2px;
  font-size: 13px;
}

.breadcrumb-item {
  cursor: pointer;
  padding: 3px 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--text-primary);
  font-weight: 500;
}
.breadcrumb-item:hover { background: var(--surface-hover); color: var(--brand); }

.content-area {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  width: 100%;
}

.files-card {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  min-height: 420px;
  flex: 1;
  width: 100%;
  transition: all 0.2s ease;
}

.inspector-pane {
  width: 320px;
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 18px;
  display: none;
  flex-direction: column;
  gap: 14px;
  animation: slideInRight 0.2s ease;
}
.inspector-pane.active { display: flex; }

@keyframes slideInRight {
  from { transform: translateX(15px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.meta-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 8px;
}
.meta-label { font-size: 11px; color: var(--text-tertiary); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
.meta-val { font-size: 13px; color: var(--text-primary); word-break: break-all; font-weight: 500; }

.meta-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 11px;
  background: var(--surface-subtle);
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  line-height: 1.4;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 6px;
  width: 100%;
  box-sizing: border-box;
}

.meta-code span { flex: 1; word-break: break-all; overflow-wrap: anywhere; }

.meta-copy-btn {
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 2px;
  display: flex;
  align-items: center;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.meta-copy-btn:hover { color: var(--brand); background: var(--surface-hover); }

.file-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 13px; }
.file-table th {
  padding: 10px 14px;
  color: var(--text-secondary);
  font-weight: 500;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 12px;
  background: var(--surface-subtle);
}
.file-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
}
.file-table tbody tr:hover { background: var(--surface-hover); }
.file-table tr.selected { background: var(--brand-subtle) !important; }

.item-cut { opacity: 0.45 !important; filter: grayscale(0.4); }

.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
  padding: 16px;
}

.grid-item {
  border: 1px solid var(--border-subtle);
  background: var(--surface-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  position: relative;
  transition: all 0.15s ease;
  text-align: center;
}
.grid-item:hover { background: var(--surface-hover); box-shadow: var(--shadow-card); }
.grid-item.selected { background: var(--brand-subtle); border-color: var(--brand); }

.grid-checkbox { position: absolute; top: 10px; left: 10px; }
.drag-target-hover { outline: 2px dashed var(--brand) !important; background: var(--brand-subtle) !important; }

.name-cell {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  cursor: pointer;
}
.name-cell:hover span.name-text { text-decoration: underline; color: var(--brand); }

.action-btn {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  border-radius: var(--radius-sm);
  padding: 5px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.action-btn:hover { background: var(--surface-pressed); color: var(--text-primary); }
.action-btn.danger:hover { color: var(--danger); }

.fluent-context-menu {
  position: fixed;
  background: #ffffff;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-flyout);
  min-width: 210px;
  padding: 6px;
  display: none;
  flex-direction: column;
  z-index: 5000;
  animation: dialogIn 0.1s ease-out;
}
.fluent-context-menu.active { display: flex; }

.context-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 12px;
  font-size: 13px;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  user-select: none;
  transition: background 0.1s;
}
.context-menu-item:hover { background: var(--surface-hover); }
.context-menu-item.disabled { opacity: 0.4; pointer-events: none; }
.context-menu-item .shortcut { margin-left: auto; font-size: 11px; color: var(--text-tertiary); }
.context-menu-divider { height: 1px; background: var(--border-subtle); margin: 4px 6px; }
.context-menu-item.danger:hover { color: var(--danger); background: #fde7e9; }

.batch-bar {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-flyout);
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 100;
  transition: transform 0.25s cubic-bezier(0, 0, 0.2, 1);
}
.batch-bar.visible { transform: translateX(-50%) translateY(0); }

.fluent-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(10px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.fluent-modal-overlay.active { display: flex; }

.fluent-dialog {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-flyout);
  width: 100%;
  max-width: 520px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: dialogIn 0.15s ease-out;
}
@keyframes dialogIn {
  from { transform: scale(0.97); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.dialog-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.dialog-title { font-size: 15px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.dialog-body { padding: 18px 20px; overflow-y: auto; flex: 1; display: flex; flex-direction: column; gap: 14px; max-height: 80vh; }
.dialog-footer { padding: 12px 20px; background: var(--surface-subtle); border-top: 1px solid var(--border-subtle); display: flex; justify-content: flex-end; gap: 8px; }

.upload-dropzone {
  border: 2px dashed var(--border-default);
  border-radius: var(--radius-md);
  padding: 28px 16px;
  text-align: center;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background: var(--surface-subtle);
  transition: all 0.15s;
}
.upload-dropzone:hover { border-color: var(--brand); background: var(--brand-subtle); }

.form-group { display: flex; flex-direction: column; gap: 4px; font-size: 13px; }
.form-group label { font-weight: 500; color: var(--text-secondary); }
.form-input {
  font-family: inherit;
  padding: 8px 10px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  outline: none;
  font-size: 13px;
}
.form-input:focus { border-color: var(--brand); }

.icon-folder { color: #f59e0b; }
.icon-file { color: #64748b; }
.icon-code { color: #10b981; }
.icon-image { color: #8b5cf6; }
.icon-pdf { color: #dc2626; }
.icon-zip { color: #ea580c; }