/* ========================================
   产出导航站 — 全局样式
   ======================================== */

:root {
  --c-bg: #f8f9fb;
  --c-surface: #ffffff;
  --c-border: #e5e7eb;
  --c-border-light: #f0f1f3;
  --c-text: #1a1a2e;
  --c-text-secondary: #6b7280;
  --c-text-muted: #9ca3af;
  --c-primary: #4f46e5;
  --c-primary-hover: #4338ca;
  --c-primary-soft: #eef2ff;
  --c-danger: #ef4444;
  --c-danger-hover: #dc2626;
  --c-danger-soft: #fef2f2;
  --c-success: #10b981;
  --c-success-soft: #ecfdf5;
  --c-warning: #f59e0b;
  --c-warning-soft: #fffbeb;
  --radius: 12px;
  --radius-md: 10px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08), 0 1px 4px rgba(0,0,0,.04);
  --shadow-lg: 0 12px 32px rgba(0,0,0,.1);
  --transition: 0.2s ease;
  --sidebar-width: 240px;
}

/* --- Reset --- */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; }
button { cursor: pointer; font: inherit; border: none; background: none; }
input, textarea { font: inherit; }

/* ========================================
   Header
   ======================================== */
.header {
  position: sticky; top: 0; z-index: 100;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  backdrop-filter: blur(12px);
}
.header-inner {
  width: 100%; padding: 0 24px;
  height: 60px; display: flex; align-items: center; gap: 16px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 18px; color: var(--c-text);
  flex-shrink: 0;
}
.logo svg { color: var(--c-primary); }
.nav-links { display: flex; gap: 4px; }
.nav-link {
  padding: 6px 14px; border-radius: var(--radius-xs);
  font-size: 14px; font-weight: 500; color: var(--c-text-secondary);
  transition: all var(--transition);
}
.nav-link:hover { background: var(--c-primary-soft); color: var(--c-primary); }
.nav-link.active { background: var(--c-primary-soft); color: var(--c-primary); }
.back-home-btn {
  margin-left: auto; display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: var(--radius-xs);
  font-size: 14px; font-weight: 500; color: var(--c-text-secondary);
  transition: all var(--transition);
}
.back-home-btn:hover { background: var(--c-primary-soft); color: var(--c-primary); }
.header-search {
  flex: 1; display: flex; align-items: center; justify-content: center;
  max-width: 480px; margin: 0 auto; position: relative;
}
.header-search .search-icon {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  color: var(--c-text-muted); pointer-events: none;
}
.header-search .search-input {
  width: 100%; padding: 8px 12px 8px 36px;
  border: 1px solid var(--c-border); border-radius: var(--radius-xs);
  background: var(--c-bg); font-size: 13px; color: var(--c-text);
  outline: none; transition: border-color var(--transition);
}
.header-search .search-input:focus { border-color: var(--c-primary); background: var(--c-surface); }
.header-right {
  margin-left: auto; display: flex; align-items: baseline; gap: 4px;
}
.material-count { font-size: 20px; font-weight: 700; color: var(--c-primary); }
.count-label { font-size: 13px; color: var(--c-text-muted); }
.logout-btn {
  margin-left: 12px; padding: 4px 8px; border-radius: var(--radius-xs);
  color: var(--c-text-muted); transition: all var(--transition);
  display: inline-flex; align-items: center;
}
.logout-btn:hover { color: var(--c-danger); background: var(--c-danger-soft); }

.app-body {
  display: flex; flex-direction: column;
  height: 100vh; overflow: hidden;
  background: var(--c-bg);
}

/* --- App Layout --- */
.app-layout {
  display: flex; flex: 1; overflow: hidden;
}

/* --- Sidebar --- */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  display: flex; flex-direction: column;
  overflow: hidden;
}

/* --- Directory Tree --- */
.dir-tree {
  flex: 1; overflow-y: auto; overflow-x: hidden;
  padding: 8px 0;
}
.tree-loading {
  text-align: center; padding: 24px 16px;
  font-size: 13px; color: var(--c-text-muted);
}
.tree-node { user-select: none; }
.tree-node-header {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 16px; cursor: pointer;
  font-size: 13px; color: var(--c-text-secondary);
  transition: all var(--transition);
  border-left: 3px solid transparent;
}
.tree-node-header:hover { background: var(--c-bg); color: var(--c-text); }
.tree-node-header.active {
  background: var(--c-primary-soft); color: var(--c-primary);
  border-left-color: var(--c-primary); font-weight: 600;
}
.tree-node-arrow {
  width: 16px; height: 16px; display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; color: var(--c-text-muted); font-size: 10px;
  transition: transform 0.2s ease;
}
.tree-node-arrow.expanded { transform: rotate(90deg); }
.tree-node-icon {
  flex-shrink: 0; color: var(--c-primary); opacity: 0.7;
}
.tree-node-label { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tree-node-count {
  font-size: 11px; color: var(--c-text-muted); flex-shrink: 0;
  background: var(--c-bg); padding: 1px 6px; border-radius: 10px;
}
.tree-children { overflow: hidden; }
.tree-children .tree-node-header { padding-left: 36px; }
.tree-children .tree-children .tree-node-header { padding-left: 56px; }
.tree-children .tree-children .tree-children .tree-node-header { padding-left: 76px; }

/* --- Content Area --- */
.content-area {
  flex: 1; display: flex; flex-direction: column;
  overflow: hidden; min-width: 0;
}

/* --- Workspace: preview overlays list --- */
.workspace {
  flex: 1; display: flex; flex-direction: column; overflow: hidden;
  position: relative;
}
.list-panel {
  flex: 1; display: flex; flex-direction: column;
  overflow: hidden;
}
.panel-header {
  height: 40px; padding: 0 24px;
  display: flex; align-items: center; gap: 8px;
  border-bottom: 1px solid var(--c-border-light);
  background: var(--c-surface); flex-shrink: 0;
}
.panel-title { font-size: 13px; font-weight: 600; color: var(--c-text); }
.panel-count {
  font-size: 12px; color: var(--c-text-muted);
  background: var(--c-bg); padding: 1px 8px; border-radius: 10px;
}
.panel-body {
  flex: 1; overflow: auto; background: var(--c-surface);
}

/* --- Data Table --- */
.data-table {
  width: 100%; border-collapse: collapse;
}
.data-table thead {
  position: sticky; top: 0; z-index: 2;
  background: var(--c-bg);
}
.data-table th {
  padding: 10px 20px; font-size: 12px; font-weight: 600;
  color: var(--c-text-muted); text-align: left;
  border-bottom: 1px solid var(--c-border-light);
  white-space: nowrap; text-transform: uppercase; letter-spacing: 0.5px;
}
.data-row {
  transition: background var(--transition);
  cursor: pointer;
}
.data-row:hover { background: var(--c-primary-soft); }
.data-row:not(:last-child) td { border-bottom: 1px solid var(--c-border-light); }
.data-row.selected { background: var(--c-primary-soft); }
.data-row td {
  padding: 12px 20px; vertical-align: middle;
}
.data-name {
  display: flex; align-items: center; gap: 8px;
}
.data-name-text {
  font-size: 14px; font-weight: 600; color: var(--c-text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 300px;
}
.data-ext-badge {
  padding: 2px 6px; border-radius: 4px;
  font-size: 10px; font-weight: 700; color: var(--c-primary);
  background: var(--c-primary-soft); flex-shrink: 0;
  letter-spacing: 0.5px;
}
.data-desc {
  font-size: 13px; color: var(--c-text-secondary);
  max-width: 360px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.data-tags {
  display: flex; flex-wrap: wrap; gap: 4px;
}
.data-tag {
  padding: 2px 8px; border-radius: 10px;
  font-size: 11px; color: var(--c-primary); background: var(--c-primary-soft);
  font-weight: 500; white-space: nowrap;
}
.data-actions {
  white-space: nowrap; position: relative;
}
/* 三点按钮 */
.data-btn-more {
  width: 32px; height: 32px; border: none; border-radius: var(--radius-xs);
  background: transparent; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--c-text-secondary);
  transition: all var(--transition);
}
.data-btn-more:hover { background: var(--c-border-light); color: var(--c-text); }
/* 下拉菜单 */
.data-dropdown {
  display: none; position: absolute; right: 0; top: 100%;
  min-width: 130px; background: var(--c-surface);
  border: 1px solid var(--c-border); border-radius: var(--radius-md);
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
  z-index: 20; padding: 4px; margin-top: 4px;
}
.data-dropdown.open { display: block; }
.data-dropdown-item {
  display: block; width: 100%; padding: 8px 12px;
  border: none; border-radius: 6px; background: transparent;
  font-size: 13px; color: var(--c-text); text-align: left;
  cursor: pointer; transition: background 0.12s; white-space: nowrap;
}
.data-dropdown-item:hover { background: var(--c-primary-soft); }
.dropdown-delete { color: var(--c-danger); }
.dropdown-delete:hover { background: var(--c-danger-soft); }

/* --- Preview Panel --- */
.preview-panel {
  display: none; flex-direction: column;
  overflow: hidden; background: var(--c-surface);
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  z-index: 10;
}
.preview-panel.open {
  display: flex;
}
.preview-actions {
  display: flex; align-items: center; gap: 4px; margin-left: auto;
}
.preview-action-btn {
  padding: 4px 8px; border-radius: 4px;
  color: var(--c-text-muted); display: flex; align-items: center;
  transition: all var(--transition);
}
.preview-action-btn:hover { color: var(--c-text); background: var(--c-bg); }
.preview-body {
  flex: 1; overflow: hidden; position: relative;
}
.preview-placeholder {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 12px; color: var(--c-text-muted); font-size: 14px;
  pointer-events: none;
}
.preview-frame {
  position: absolute; inset: 0; border: none; width: 100%; height: 100%; background: #fff;
}
.preview-img {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  background: #f0f1f3; overflow: auto; padding: 24px;
}
.preview-img img {
  max-width: 100%; max-height: 100%; object-fit: contain;
  border-radius: 4px; box-shadow: var(--shadow-md);
}
.preview-code {
  position: absolute; inset: 0; overflow: auto;
  background: var(--c-surface); margin: 0; padding: 24px;
  font-family: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', Consolas, monospace;
  font-size: 13px; line-height: 1.7; color: var(--c-text); tab-size: 2;
}

/* ========================================
   Login Page
   ======================================== */
.login-body {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea20, #764ba220, var(--c-bg));
}
.login-page-card {
  background: var(--c-surface); border-radius: var(--radius);
  padding: 40px 36px; max-width: 400px; width: 90%;
  box-shadow: var(--shadow-lg); animation: fadeUp 0.4s ease;
  text-align: center;
}
.login-icon {
  width: 64px; height: 64px; border-radius: 50%;
  background: var(--c-primary-soft); color: var(--c-primary);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
}
.login-page-card h2 {
  font-size: 20px; margin-bottom: 6px; color: var(--c-text);
}
.login-subtitle { font-size: 14px; color: var(--c-text-muted); margin-bottom: 24px; }
.login-field { position: relative; margin-bottom: 16px; }
.login-field .login-input { padding-right: 44px; }
.pwd-toggle {
  position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  background: none; border: none; color: var(--c-text-muted);
  cursor: pointer; padding: 6px; display: flex; align-items: center;
  border-radius: var(--radius-xs); transition: color var(--transition);
}
.pwd-toggle:hover { color: var(--c-text); }
.auth-pwd-wrap { position: relative; }
.auth-pwd-wrap .auth-input { padding-right: 40px; }
.auth-pwd-wrap .pwd-toggle { position: absolute; right: 2px; top: 50%; transform: translateY(-50%); }
.login-input {
  width: 100%; padding: 12px 16px; border: 1px solid var(--c-border);
  border-radius: var(--radius-xs); font-size: 15px;
  background: var(--c-bg); transition: border-color var(--transition);
  box-sizing: border-box;
}
.login-input:focus { outline: none; border-color: var(--c-primary); background: var(--c-surface); }
.login-remember { margin-bottom: 20px; text-align: left; }
.remember-label {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--c-text-muted); cursor: pointer;
}
.remember-label input[type="checkbox"] { accent-color: var(--c-primary); }
.login-error {
  font-size: 13px; color: var(--c-danger); margin-bottom: 12px;
  padding: 8px 12px; background: var(--c-danger-soft); border-radius: var(--radius-xs);
}
.login-btn {
  width: 100%; padding: 12px; border-radius: var(--radius-xs);
  background: var(--c-primary); color: #fff;
  font-size: 15px; font-weight: 600; transition: background var(--transition);
}
.login-btn:hover { background: var(--c-primary-hover); }
.login-btn:disabled { opacity: 0.6; cursor: not-allowed; }
.login-footer { margin-top: 16px; font-size: 13px; }
.login-footer a { color: var(--c-text-muted); transition: color var(--transition); }
.login-footer a:hover { color: var(--c-primary); }

/* ========================================
   Main Container (upload page etc.)
   ======================================== */
.main-container {
  width: 100%; padding: 32px 32px 64px;
}
.upload-page {
  max-width: 680px;
  margin: 0 auto;
  min-height: calc(100vh - 60px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* --- Toolbar (legacy) --- */
.toolbar {
  display: flex; flex-direction: column; gap: 16px;
  margin-bottom: 32px;
}

/* --- Loading & Empty --- */
.loading, .empty-state {
  display: flex; flex-direction: column; align-items: center; gap: 16px;
  padding: 80px 0; color: var(--c-text-muted);
}
.empty-state h2 { font-size: 18px; color: var(--c-text-secondary); }
.empty-state a { color: var(--c-primary); font-weight: 500; }
.spinner {
  width: 36px; height: 36px; border: 3px solid var(--c-border);
  border-top-color: var(--c-primary); border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Card Grid (legacy) --- */
.card-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* --- Folder (legacy) --- */
.folder {
  background: var(--c-surface);
  border-radius: var(--radius);
  border: 1px solid var(--c-border-light);
  overflow: hidden;
  transition: border-color var(--transition);
}
.folder-header {
  width: 100%; display: flex; align-items: center; gap: 10px;
  padding: 14px 20px; background: var(--c-bg);
  border-bottom: 1px solid var(--c-border-light);
  font-size: 15px; font-weight: 600; color: var(--c-text);
  cursor: pointer; user-select: none;
  transition: background var(--transition);
}
.folder-header:hover { background: var(--c-primary-soft); }
.folder-arrow {
  color: var(--c-text-muted); flex-shrink: 0;
  transition: transform 0.25s ease;
}
.folder-header[aria-expanded="true"] .folder-arrow { transform: rotate(90deg); }
.folder-icon { color: var(--c-primary); flex-shrink: 0; }
.folder-title { flex: 1; text-align: left; }
.folder-count {
  font-size: 13px; font-weight: 400; color: var(--c-text-muted);
}
.folder-body {
  padding: 0;
  overflow-x: auto;
}
.folder-header[aria-expanded="false"] + .folder-body { display: none; }

/* --- List Table (legacy) --- */
.list-table {
  width: 100%; border-collapse: collapse;
}
.list-table thead {
  background: var(--c-bg);
  position: sticky; top: 0;
}
.list-table th {
  padding: 12px 20px; font-size: 13px; font-weight: 600;
  color: var(--c-text-muted); text-align: left;
  border-bottom: 1px solid var(--c-border-light);
  white-space: nowrap;
}
.list-row {
  transition: background var(--transition);
  cursor: pointer;
}
.list-row:hover { background: var(--c-primary-soft); }
.list-row:not(:last-child) { border-bottom: 1px solid var(--c-border-light); }
.list-row td { padding: 14px 20px; vertical-align: middle; }
.list-col-name {
  display: flex; align-items: center; gap: 8px; min-width: 200px;
}
.list-name {
  font-size: 14px; font-weight: 600; color: var(--c-text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 240px;
}
.list-ext-badge {
  padding: 2px 6px; border-radius: 4px;
  font-size: 10px; font-weight: 700; color: var(--c-primary);
  background: var(--c-primary-soft); flex-shrink: 0;
  letter-spacing: 0.5px;
}
.list-col-desc {
  font-size: 13px; color: var(--c-text-secondary);
  max-width: 300px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.list-col-tags {
  display: flex; flex-wrap: wrap; gap: 4px;
}
.list-tag {
  padding: 2px 8px; border-radius: 10px;
  font-size: 11px; color: var(--c-primary); background: var(--c-primary-soft);
  font-weight: 500; white-space: nowrap;
}
.list-col-actions { white-space: nowrap; }
.list-btn {
  padding: 4px 12px; border-radius: var(--radius-xs);
  font-size: 12px; font-weight: 500; transition: all var(--transition);
  display: inline-flex; align-items: center; gap: 4px;
}
.list-btn + .list-btn { margin-left: 6px; }
.list-btn-delete { color: var(--c-danger); }
.list-btn-delete:hover { background: var(--c-danger-soft); }

/* ========================================
   Upload Page
   ======================================== */
.auth-section, .upload-section {
  animation: fadeUp 0.4s ease;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.auth-card {
  background: var(--c-surface); border-radius: var(--radius);
  padding: 48px 32px; text-align: center;
  border: 1px solid var(--c-border); max-width: 400px; margin: 0 auto;
  display: flex; flex-direction: column; align-items: center; gap: 16px;
}
.auth-card svg { color: var(--c-text-muted); }
.auth-card h3 { font-size: 18px; }
.auth-card p { font-size: 14px; color: var(--c-text-muted); }
.auth-input {
  width: 100%; padding: 10px 14px; border: 1px solid var(--c-border);
  border-radius: var(--radius-sm); outline: none; font-size: 14px;
  transition: border-color var(--transition);
}
.auth-input:focus { border-color: var(--c-primary); }

.upload-header { text-align: center; margin-bottom: 32px; }
.upload-header h2 { font-size: 22px; margin-bottom: 6px; }
.upload-header p { font-size: 14px; color: var(--c-text-muted); }

/* Drop Zone */
.drop-zone {
  background: var(--c-surface); border: 2px dashed var(--c-border);
  border-radius: var(--radius); padding: 48px 24px;
  text-align: center; transition: all var(--transition);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
}
.drop-zone.dragover { border-color: var(--c-primary); background: var(--c-primary-soft); }
.drop-icon { color: var(--c-text-muted); }
.drop-text { font-size: 15px; font-weight: 500; color: var(--c-text-secondary); }
.drop-hint { font-size: 13px; color: var(--c-text-muted); }

/* File Preview List */
.file-preview-list { margin-top: 16px; display: flex; flex-direction: column; gap: 8px; }
.file-preview-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; background: var(--c-surface);
  border: 1px solid var(--c-border); border-radius: var(--radius-sm);
}
.file-preview-icon {
  width: 40px; height: 40px; border-radius: var(--radius-xs);
  background: var(--c-primary-soft); display: flex; align-items: center; justify-content: center;
  color: var(--c-primary); font-weight: 700; font-size: 16px; flex-shrink: 0;
}
.file-preview-info { flex: 1; min-width: 0; }
.file-preview-name { font-size: 14px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-preview-size { font-size: 12px; color: var(--c-text-muted); }
.file-preview-remove {
  padding: 4px 8px; border-radius: var(--radius-xs);
  color: var(--c-danger); font-size: 12px; font-weight: 500; flex-shrink: 0;
}
.file-preview-remove:hover { background: var(--c-danger-soft); }

/* Upload Form */
.upload-form {
  background: var(--c-surface); border-radius: var(--radius);
  border: 1px solid var(--c-border); padding: 28px; margin-top: 20px;
  animation: fadeUp 0.3s ease;
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 14px; font-weight: 500;
  margin-bottom: 6px; color: var(--c-text);
}
.required { color: var(--c-danger); }
.form-input {
  width: 100%; padding: 10px 14px; border: 1px solid var(--c-border);
  border-radius: var(--radius-sm); font-size: 14px; outline: none;
  transition: border-color var(--transition);
}
.form-input:focus { border-color: var(--c-primary); }
.form-textarea { resize: vertical; min-height: 80px; }
.form-hint { font-size: 12px; color: var(--c-text-muted); margin-top: 4px; display: block; }

.tag-input-wrapper {
  display: flex; flex-wrap: wrap; gap: 6px; align-items: center;
  padding: 6px 10px; border: 1px solid var(--c-border);
  border-radius: var(--radius-sm); background: var(--c-surface);
  transition: border-color var(--transition); min-height: 42px;
}
.tag-input-wrapper:focus-within { border-color: var(--c-primary); }
.tag-list { display: flex; flex-wrap: wrap; gap: 4px; }
.tag-badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 10px; border-radius: 14px;
  font-size: 13px; color: var(--c-primary); background: var(--c-primary-soft);
}
.tag-badge-remove {
  font-size: 14px; line-height: 1; cursor: pointer;
  color: var(--c-primary); opacity: 0.6;
}
.tag-badge-remove:hover { opacity: 1; }
.tag-input {
  border: none; outline: none; font-size: 13px; flex: 1;
  min-width: 120px; background: transparent;
}

.form-actions { display: flex; gap: 12px; margin-top: 24px; }

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500; transition: all var(--transition);
  justify-content: center;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--c-primary-hover); }
.btn-outline { border: 1px solid var(--c-border); color: var(--c-text-secondary); background: var(--c-surface); }
.btn-outline:hover { border-color: var(--c-primary); color: var(--c-primary); }
.btn-danger { background: var(--c-danger); color: #fff; }
.btn-danger:hover { background: var(--c-danger-hover); }
.btn-ghost { color: var(--c-text-muted); }
.btn-ghost:hover { color: var(--c-text); }
.btn-sm { padding: 6px 12px; font-size: 13px; }

/* ========================================
   Progress / Success
   ======================================== */
.upload-progress { margin-top: 24px; text-align: center; }
.progress-bar { height: 6px; background: var(--c-border); border-radius: 3px; overflow: hidden; margin-bottom: 10px; }
.progress-fill { height: 100%; background: var(--c-primary); border-radius: 3px; width: 0%; transition: width 0.3s ease; }
.progress-text { font-size: 14px; color: var(--c-text-muted); }

.upload-success {
  margin-top: 24px; text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 16px;
  animation: fadeUp 0.4s ease;
}
.upload-success h3 { font-size: 20px; color: var(--c-success); }
.upload-success p { color: var(--c-text-muted); }
.success-actions { display: flex; gap: 12px; margin-top: 8px; }

/* ========================================
   Preview Page (standalone)
   ======================================== */
.preview-body {
  display: flex; flex-direction: column; height: 100vh;
  background: var(--c-surface);
}
.preview-header {
  height: 52px; border-bottom: 1px solid var(--c-border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px; flex-shrink: 0; background: var(--c-surface);
}
.preview-header-left { display: flex; align-items: center; gap: 16px; }
.preview-back {
  display: flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 500; color: var(--c-text-secondary);
  transition: color var(--transition);
}
.preview-back:hover { color: var(--c-primary); }
.preview-title { font-size: 15px; font-weight: 600; color: var(--c-text); }
.preview-ext-badge {
  padding: 2px 8px; border-radius: 4px;
  font-size: 11px; font-weight: 700; color: var(--c-primary);
  background: var(--c-primary-soft); letter-spacing: 0.5px;
}
.preview-header-right { display: flex; gap: 8px; }
.preview-loading, .preview-error {
  position: absolute; inset: 0; z-index: 5;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 16px;
  color: var(--c-text-muted); background: var(--c-surface);
}
.preview-error h3 { font-size: 18px; color: var(--c-text-secondary); }
.preview-frame { flex: 1; border: none; width: 100%; }

/* 图片预览 */
.preview-img-view {
  flex: 1; display: flex; align-items: center; justify-content: center;
  background: #f0f1f3; overflow: auto; padding: 24px;
}
.preview-img-view img {
  max-width: 100%; max-height: 100%; object-fit: contain;
  border-radius: 4px; box-shadow: var(--shadow-md);
}

/* 代码预览 */
.preview-code-view {
  flex: 1; overflow: auto; background: var(--c-surface);
}
.preview-code-view pre {
  padding: 24px; margin: 0; min-height: 100%;
}
.preview-code-view code {
  font-family: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', Consolas, monospace;
  font-size: 13px; line-height: 1.7; color: var(--c-text); white-space: pre; tab-size: 2;
}

/* Markdown 预览 */
.preview-md-view {
  flex: 1; overflow: hidden; display: flex; flex-direction: column;
  background: var(--c-surface); min-height: 0;
}
.preview-md-view .markdown-body {
  flex: 1; overflow: auto; padding: 24px 32px; min-height: 0;
}
.preview-md-view .preview-md-source {
  flex: 1; min-height: 0;
}
.preview-md {
  position: absolute; inset: 0; overflow-y: auto;
  background: var(--c-surface);
}
.markdown-body {
  font-size: 15px; line-height: 1.8; color: var(--c-text);
}
.markdown-body h1 { font-size: 28px; font-weight: 700; margin: 24px 0 16px; padding-bottom: 8px; border-bottom: 1px solid var(--c-border); }
.markdown-body h2 { font-size: 24px; font-weight: 700; margin: 24px 0 14px; }
.markdown-body h3 { font-size: 20px; font-weight: 600; margin: 20px 0 12px; }
.markdown-body h4 { font-size: 18px; font-weight: 600; margin: 16px 0 10px; }
.markdown-body p { margin: 0 0 12px; }
.markdown-body ul, .markdown-body ol { margin: 0 0 12px; padding-left: 24px; }
.markdown-body li { margin-bottom: 4px; }
.markdown-body code {
  font-family: 'Cascadia Code', 'Fira Code', Consolas, monospace;
  font-size: 13px; background: var(--c-bg); padding: 2px 6px; border-radius: 4px;
}
.markdown-body pre {
  background: var(--c-bg); padding: 16px 20px; border-radius: 8px;
  overflow-x: auto; margin: 12px 0; border: 1px solid var(--c-border);
}
.markdown-body pre code {
  background: none; padding: 0; font-size: 13px; line-height: 1.6;
}
.markdown-body blockquote {
  border-left: 3px solid var(--c-primary); margin: 12px 0; padding: 4px 16px;
  color: var(--c-text-secondary); background: var(--c-bg); border-radius: 0 6px 6px 0;
}
.markdown-body table {
  border-collapse: collapse; margin: 12px 0; width: 100%;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--c-border); padding: 8px 14px; text-align: left;
}
.markdown-body th { background: var(--c-bg); font-weight: 600; }
.markdown-body a { color: var(--c-primary); text-decoration: none; }
.markdown-body a:hover { text-decoration: underline; }
.markdown-body hr { border: none; border-top: 1px solid var(--c-border); margin: 24px 0; }
.markdown-body img { max-width: 100%; border-radius: 6px; }

/* MD 预览/源码切换 */
.md-toggle {
  display: inline-flex; gap: 0; border-radius: 6px; overflow: hidden;
  border: 1px solid var(--c-border); margin-left: 12px;
}
.md-toggle-btn {
  padding: 4px 14px; font-size: 12px; font-weight: 500; cursor: pointer;
  background: var(--c-surface); color: var(--c-text-secondary);
  border: none; outline: none; transition: all 0.15s;
}
.md-toggle-btn + .md-toggle-btn { border-left: 1px solid var(--c-border); }
.md-toggle-btn.active {
  background: var(--c-primary); color: #fff;
}
.md-toggle-btn:hover:not(.active) { background: var(--c-bg); }

/* MD 源码视图 */
.preview-md-source {
  padding: 24px; margin: 0;
  background: var(--c-surface); min-height: 0;
  font-family: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', Consolas, monospace;
  font-size: 13px; line-height: 1.7; color: var(--c-text); tab-size: 2; white-space: pre;
}

.preview-md-body {
  padding: 24px 32px;
}

/* 文本预览 */
.preview-text-view {
  flex: 1; overflow: auto; background: var(--c-surface);
}
.preview-text-view pre {
  padding: 24px; margin: 0; min-height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px; line-height: 1.8; color: var(--c-text);
  white-space: pre-wrap; word-break: break-word;
}

/* ========================================
   FAB 浮动上传按钮
   ======================================== */
.fab {
  position: fixed; bottom: 32px; right: 32px; z-index: 50;
  width: 56px; height: 56px; border-radius: 50%;
  background: var(--c-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 16px rgba(0,0,0,0.18);
  transition: transform 0.2s, box-shadow 0.2s;
  text-decoration: none;
}
.fab:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 24px rgba(0,0,0,0.25);
}
.fab:active { transform: scale(0.95); }

/* ========================================
   Toast
   ======================================== */
.toast-container {
  position: fixed; top: 80px; right: 24px; z-index: 1000;
  display: flex; flex-direction: column; gap: 8px;
  pointer-events: none;
}
.toast {
  padding: 12px 18px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500; pointer-events: auto;
  background: var(--c-surface);
  box-shadow: var(--shadow-lg); animation: slideIn 0.3s ease;
  max-width: 360px;
}
.toast-success { color: var(--c-success); }
.toast-error { color: var(--c-danger); }
.toast-warning { color: var(--c-warning); }
@keyframes slideIn {
  from { opacity: 0; transform: translateX(100px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ========================================
   Modal
   ======================================== */
.modal-overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(0, 0, 0, 0.4);
  display: flex; align-items: center; justify-content: center;
  animation: fadeIn 0.2s ease;
}
.modal {
  background: var(--c-surface); border-radius: var(--radius);
  padding: 28px; max-width: 420px; width: 90%;
  box-shadow: var(--shadow-lg); animation: fadeUp 0.3s ease;
}
.modal h3 { font-size: 17px; margin-bottom: 10px; }
.modal p { font-size: 14px; color: var(--c-text-secondary); margin-bottom: 20px; }
.modal-input {
  width: 100%; padding: 10px 12px; margin-bottom: 20px;
  border: 1px solid var(--c-border); border-radius: var(--radius-xs);
  font-size: 14px; color: var(--c-text); background: var(--c-bg);
  outline: none; transition: border-color 0.15s; box-sizing: border-box;
}
.modal-input:focus { border-color: var(--c-primary); }
.modal-field { margin-bottom: 16px; }
.modal-field label {
  display: block; font-size: 13px; color: var(--c-text-secondary); margin-bottom: 6px;
}
.modal-field .modal-input { margin-bottom: 0; }
.input-with-suffix { position: relative; }
.input-with-suffix .modal-input { padding-right: 64px; }
.input-suffix {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  font-size: 12px; color: var(--c-text-muted); pointer-events: none;
  background: var(--c-bg); padding: 2px 8px; border-radius: var(--radius-xs);
  max-width: 48px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.modal-textarea { resize: vertical; min-height: 64px; font-family: inherit; line-height: 1.5; }
.modal-actions { display: flex; gap: 12px; justify-content: flex-end; margin-top: 4px; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
  .sidebar { position: fixed; left: 0; top: 60px; bottom: 0; z-index: 50; }
  .panel-header { padding: 0 12px; }
  .data-table th, .data-row td { padding: 10px 12px; }
  .data-name-text { max-width: 160px; }
  .data-desc { max-width: 120px; display: none; }
  .breadcrumb { display: none; }
}

@media (max-width: 640px) {
  .header-inner { padding: 0 16px; gap: 12px; }
  .main-container { padding: 20px 16px 40px; }
  .card-grid { gap: 16px; }
  .upload-section { max-width: 100%; }
  .drop-zone { padding: 32px 16px; }
  .data-table th, .data-row td { padding: 8px 10px; }
  .data-name-text { max-width: 120px; font-size: 13px; }
  .data-desc { display: none; }
  .data-tags { display: none; }
  .preview-panel { position: fixed; }
  .nav-links { display: none; }
}