:root {
  --bg: #0f172a;
  --bg-panel: #1e293b;
  --bg-hover: #334155;
  --bg-selected: rgba(59, 130, 246, 0.25);
  --bg-input: #0b1120;
  --border: #334155;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;
  --warning: #f59e0b;
  --radius: 6px;
}

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

body {
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  font-size: 13.5px;
  line-height: 1.45;
  height: 100vh;
  overflow: hidden;
  user-select: none;
}

.hidden {
  display: none !important;
}

.login-wrapper {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.login-box {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 100%;
  max-width: 360px;
  padding: 28px 24px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45);
}

.login-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 4px;
  text-align: center;
}

.login-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
  font-weight: 500;
}

.input {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 13.5px;
  outline: none;
  user-select: text;
}

.input:focus {
  border-color: var(--primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 6px 11px;
  border-radius: var(--radius);
  font-size: 12.5px;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text);
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
  white-space: nowrap;
}

.btn:hover:not(:disabled) {
  background: var(--bg-hover);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn-danger {
  background: transparent;
  border-color: rgba(239, 68, 68, 0.45);
  color: #fca5a5;
}

.btn-danger:hover:not(:disabled) {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}

.btn-sm {
  padding: 4px 8px;
  font-size: 12px;
}

.btn-block {
  width: 100%;
  padding: 9px;
}

.error-msg {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid var(--danger);
  color: #fca5a5;
  padding: 8px 10px;
  border-radius: var(--radius);
  font-size: 12px;
  margin-bottom: 14px;
}

.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: #141d2f;
  border-bottom: 1px solid var(--border);
  gap: 12px;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand {
  font-weight: 700;
  font-size: 14.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.storage-badge {
  font-size: 10.5px;
  padding: 2px 7px;
  border-radius: 4px;
  background: #0284c7;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

.nav-tabs {
  display: flex;
  gap: 4px;
}

.tab-btn {
  padding: 6px 13px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.tab-btn:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

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

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.quota-box {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 145px;
}

.quota-text {
  font-size: 11px;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

.quota-bar {
  height: 5px;
  background: var(--bg-input);
  border-radius: 99px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.quota-fill {
  height: 100%;
  background: var(--primary);
  width: 0%;
}

.page-view {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.win-ribbon {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 14px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  gap: 8px;
  flex-wrap: wrap;
}

.ribbon-group {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
}

.ribbon-divider {
  width: 1px;
  height: 22px;
  background: var(--border);
  margin: 0 4px;
}

.win-address-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: #162032;
  border-bottom: 1px solid var(--border);
}

.nav-arrows {
  display: flex;
  gap: 4px;
}

.breadcrumbs {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 3px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 10px;
  overflow-x: auto;
  min-height: 31px;
}

.crumb {
  color: var(--text);
  cursor: pointer;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12.5px;
}

.crumb:hover {
  background: var(--bg-hover);
  color: #fff;
}

.crumb-sep {
  color: var(--text-muted);
  font-size: 11px;
}

.address-search {
  width: 220px;
}

.win-body {
  flex: 1;
  display: grid;
  grid-template-columns: 200px 1fr;
  overflow: hidden;
}

@media (max-width: 768px) {
  .win-body {
    grid-template-columns: 1fr;
  }
  .win-sidebar {
    display: none;
  }
}

.win-sidebar {
  background: #151f32;
  border-right: 1px solid var(--border);
  padding: 10px 8px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow-y: auto;
}

.sidebar-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 4px 10px;
  margin-bottom: 4px;
}

.nav-tree-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text);
  font-size: 13px;
}

.nav-tree-item:hover {
  background: var(--bg-hover);
}

.nav-tree-item.active {
  background: var(--bg-selected);
  border-left: 3px solid var(--primary);
  font-weight: 600;
}

.sidebar-bottom {
  border-top: 1px solid var(--border);
  padding-top: 10px;
}

.win-content {
  flex: 1;
  background: var(--bg);
  overflow: auto;
  position: relative;
  display: flex;
  flex-direction: column;
}

.win-content.drag-over {
  outline: 2px dashed var(--primary);
  outline-offset: -4px;
  background: rgba(59, 130, 246, 0.08);
}

.files-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(125px, 1fr));
  gap: 10px;
  padding: 14px;
}

.grid-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 12px 8px 10px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  position: relative;
  transition: background 0.1s;
}

.grid-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
}

.grid-card.selected {
  background: var(--bg-selected);
  border-color: var(--primary);
}

.grid-card-check {
  position: absolute;
  top: 6px;
  left: 6px;
  width: 15px;
  height: 15px;
  opacity: 0;
  cursor: pointer;
}

.grid-card:hover .grid-card-check,
.grid-card.selected .grid-card-check {
  opacity: 1;
}

.grid-icon {
  font-size: 38px;
  line-height: 1.1;
  margin-bottom: 6px;
}

.grid-name {
  font-size: 12.5px;
  font-weight: 500;
  word-break: break-word;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.grid-meta {
  font-size: 10.5px;
  color: var(--text-muted);
  margin-top: 2px;
}

table.file-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

table.file-table th {
  position: sticky;
  top: 0;
  background: #162032;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  z-index: 2;
}

table.file-table td {
  padding: 7px 12px;
  border-bottom: 1px solid rgba(51, 65, 85, 0.45);
  vertical-align: middle;
  font-size: 13px;
}

table.file-table tr {
  cursor: pointer;
}

table.file-table tr:hover td {
  background: rgba(255, 255, 255, 0.04);
}

table.file-table tr.selected td {
  background: var(--bg-selected);
}

.item-name-cell {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 500;
}

.row-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
}

.win-statusbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 14px;
  background: #141d2f;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-muted);
}

.context-menu {
  position: fixed;
  background: #1e293b;
  border: 1px solid #475569;
  border-radius: 6px;
  min-width: 215px;
  padding: 5px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.55);
  z-index: 999;
}

.ctx-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  border-radius: 4px;
  font-size: 12.5px;
  color: var(--text);
  cursor: pointer;
}

.ctx-item:hover {
  background: var(--primary);
  color: #fff;
}

.ctx-item.danger:hover {
  background: var(--danger);
}

.ctx-shortcut {
  font-size: 11px;
  color: var(--text-muted);
}

.ctx-item:hover .ctx-shortcut {
  color: rgba(255, 255, 255, 0.8);
}

.ctx-divider {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

.upload-status {
  background: rgba(59, 130, 246, 0.2);
  border-bottom: 1px solid var(--primary);
  padding: 6px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12.5px;
}

.empty-state {
  padding: 50px 20px;
  text-align: center;
  color: var(--text-muted);
}

.ai-layout {
  flex: 1;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 12px;
  padding: 12px 16px;
  overflow: hidden;
}

@media (max-width: 850px) {
  .ai-layout {
    grid-template-columns: 1fr;
  }
}

.ai-sidebar {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
}

.ai-sidebar h3 {
  font-size: 13.5px;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
}

.ai-main {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-messages {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  user-select: text;
}

.msg {
  max-width: 88%;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13.5px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

.msg-user {
  align-self: flex-end;
  background: var(--primary);
  color: #fff;
}

.msg-assistant {
  align-self: flex-start;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
}

.msg-header {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 5px;
  display: flex;
  justify-content: space-between;
}

.code-block-wrap {
  margin: 8px 0;
  background: #050811;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.code-block-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 10px;
  background: #111827;
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-muted);
}

.code-block-wrap pre {
  padding: 10px;
  overflow-x: auto;
  font-family: Consolas, Monaco, "Courier New", monospace;
  font-size: 12.5px;
  color: #e2e8f0;
}

.chat-input-bar {
  padding: 10px 12px;
  border-top: 1px solid var(--border);
  background: #162032;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.attached-file-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(59, 130, 246, 0.2);
  border: 1px solid var(--primary);
  padding: 3px 9px;
  border-radius: 4px;
  font-size: 12px;
  align-self: flex-start;
}

.chat-input-row {
  display: flex;
  gap: 8px;
}

.chat-textarea {
  flex: 1;
  min-height: 44px;
  max-height: 150px;
  resize: vertical;
  font-family: inherit;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 500;
}

.modal-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 100%;
  max-width: 840px;
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6);
}

.modal-header {
  padding: 11px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
}

.modal-body {
  padding: 14px 16px;
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.editor-textarea {
  width: 100%;
  height: 430px;
  background: var(--bg-input);
  color: #e2e8f0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  font-family: Consolas, Monaco, "Courier New", monospace;
  font-size: 13px;
  line-height: 1.5;
  resize: vertical;
  outline: none;
  user-select: text;
}

.modal-footer {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}