/* ===== 故障处理助手 — 全局样式 ===== */
:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #666;
  --text-tertiary: #999;
  --border: #e0e4e8;
  --error: #d93025;
  --success: #1e8e3e;
  --warning: #f9ab00;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --radius: 10px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== 登录页 ===== */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-box {
  background: var(--card);
  padding: 40px 32px;
  border-radius: 16px;
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 400px;
  text-align: center;
}

.login-box h1 { font-size: 1.6rem; margin-bottom: 4px; }
.login-box .sub { color: var(--text-secondary); margin-bottom: 24px; font-size: 0.95rem; }

.login-box label { display:block; text-align:left; margin-bottom:8px; font-weight:500; }

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

.input-row input,
.input-row button,
.login-box input[type="text"],
.login-box input[type="password"] {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  outline: none;
  transition: border 0.2s;
  margin-bottom: 4px;
}

.login-box input:focus,
.input-row input:focus { border-color: var(--primary); }

.input-row input { flex: 1; margin-bottom: 0; }

.input-row button {
  padding: 12px 24px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s;
  width: auto;
  margin-bottom: 0;
}

.input-row button:hover { background: var(--primary-dark); }
.input-row button:active { transform: scale(0.98); }

.error { color: var(--error); margin-top: 12px; font-size: 0.9rem; }

/* ===== 主布局 ===== */
.app-header {
  background: var(--card);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header h1 { font-size: 1.2rem; }
.app-header .header-right { display:flex; align-items:center; gap:12px; }
.app-header .user-tag { font-size:0.85rem; color:var(--text-secondary); }
.app-header .logout-btn {
  padding:6px 14px;
  background:none;
  border:1px solid var(--border);
  border-radius:6px;
  cursor:pointer;
  font-size:0.85rem;
  color:var(--text-secondary);
}

/* ===== 底部导航 ===== */
.nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--card);
  display: flex;
  border-top: 1px solid var(--border);
  z-index: 100;
}

.nav-item {
  flex: 1;
  text-align: center;
  padding: 10px 4px 6px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.78rem;
  border: none;
  background: none;
  transition: color 0.2s;
}

.nav-item.active { color: var(--primary); font-weight: 600; }
.nav-item .nav-icon { display:block; font-size:1.3rem; margin-bottom:2px; }

/* ===== 页面容器 ===== */
.page { display:none; padding:16px; padding-bottom:72px; max-width:800px; margin:0 auto; }
.page.active { display:block; }

/* ===== 首页 ===== */
.home-search {
  display:flex;
  gap:8px;
  background: var(--card);
  padding:12px 14px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.home-search input {
  flex:1;
  border:1px solid var(--border);
  border-radius:6px;
  padding:8px 12px;
  font-size:0.95rem;
  background:var(--bg);
  color:var(--text);
}
.home-search input::placeholder { color:var(--text-secondary); font-size:0.85rem; }
.search-results { margin-top:16px; }
.search-results h3 { font-size:0.95rem; margin-bottom:8px; color:var(--text-secondary); }

.mode-cards { display:grid; grid-template-columns:1fr 1fr 1fr; gap:14px; margin-top:16px; }
.mode-card {
  background: var(--card);
  padding: 24px 18px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  border: 2px solid transparent;
}
.mode-card:hover { transform: translateY(-2px); box-shadow: 0 4px 16px rgba(0,0,0,0.12); }
.mode-card:active { transform: scale(0.98); }
.mode-card .icon { font-size:2.4rem; margin-bottom:8px; }
.mode-card .title { font-weight:600; font-size:1.05rem; }
.mode-card .desc { color:var(--text-secondary); font-size:0.85rem; margin-top:4px; }

.recent-faults { margin-top:24px; }
.recent-faults h3 { font-size:1rem; margin-bottom:10px; }
.fault-item {
  background: var(--card);
  padding:12px 14px;
  border-radius:8px;
  margin-bottom:8px;
  cursor:pointer;
  box-shadow:0 1px 3px rgba(0,0,0,0.04);
}
.fault-item .f-title { font-weight:500; }
.fault-item .f-meta { font-size:0.8rem; color:var(--text-secondary); margin-top:2px; }

/* ===== 对话页 ===== */
.chat-container { display:flex; flex-direction:column; min-height:70vh; }
.chat-messages {
  flex:1;
  overflow-y:auto;
  margin-bottom:12px;
}

.message {
  margin-bottom:14px;
  max-width:88%;
  padding:12px 16px;
  border-radius:14px;
  font-size:0.95rem;
  line-height:1.55;
  word-break:break-word;
}

.message.user {
  background: var(--primary);
  color:#fff;
  margin-left:auto;
  border-bottom-right-radius:4px;
}

.message.assistant {
  background: var(--card);
  box-shadow: var(--shadow);
  border-bottom-left-radius:4px;
}

.message.assistant .img-preview { max-width:200px; border-radius:8px; margin-bottom:8px; }
.message img { max-width:200px; border-radius:8px; margin-bottom:8px; cursor:pointer; }

.chat-input-area {
  display:flex;
  gap:8px;
  align-items:flex-end;
}

.chat-input-area textarea {
  flex:1;
  padding:10px 14px;
  border:1.5px solid var(--border);
  border-radius:var(--radius);
  font-size:0.95rem;
  outline:none;
  resize:none;
  min-height:44px;
  max-height:120px;
  font-family:inherit;
}

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

.chat-input-area .btn-icon {
  width:44px; height:44px;
  border:1.5px solid var(--border);
  border-radius:var(--radius);
  background:var(--card);
  cursor:pointer;
  font-size:1.2rem;
  display:flex;
  align-items:center;
  justify-content:center;
}

.chat-input-area .btn-send {
  width:44px; height:44px;
  background: var(--primary);
  color:#fff;
  border:none;
  border-radius:var(--radius);
  cursor:pointer;
  font-size:1.2rem;
}

.chat-input-area .btn-send:disabled { opacity:0.5; cursor:not-allowed; }

.chat-mode-select {
  padding:8px 8px;
  border:1.5px solid var(--border);
  border-radius:var(--radius);
  background:var(--card);
  font-size:0.85rem;
  cursor:pointer;
  outline:none;
  height:44px;
  flex-shrink:0;
}
.chat-mode-select:focus { border-color: var(--primary); }

.image-tag {
  display:inline-flex;
  align-items:center;
  gap:4px;
  background:var(--bg);
  padding:4px 10px;
  border-radius:6px;
  font-size:0.85rem;
  margin:4px 0;
}

.image-tag .remove-img { cursor:pointer; color:var(--error); margin-left:4px; }

/* ===== 故障树页 ===== */
.tree-container { margin-top:12px; }
.tree-step {
  background: var(--card);
  padding:18px 16px;
  border-radius:var(--radius);
  box-shadow: var(--shadow);
  margin-bottom:12px;
}

.tree-step .step-num {
  display:inline-block;
  width:28px; height:28px;
  background:var(--primary);
  color:#fff;
  border-radius:50%;
  text-align:center;
  line-height:28px;
  font-size:0.85rem;
  margin-right:8px;
}

.tree-step .question { font-weight:600; margin:8px 0 12px; font-size:1rem; }

.tree-step .options { display:flex; flex-direction:column; gap:8px; }
.tree-step .option-btn {
  padding:10px 14px;
  border:1.5px solid var(--border);
  border-radius:8px;
  background:var(--card);
  cursor:pointer;
  text-align:left;
  font-size:0.95rem;
  transition: all 0.15s;
}

.tree-step .option-btn:hover { border-color:var(--primary); background:#e8f0fe; }
.tree-step .option-btn.selected { border-color:var(--primary); background:#e8f0fe; font-weight:500; }

.tree-conclusion {
  background: #e8f5e9;
  padding:18px 16px;
  border-radius:var(--radius);
  border-left:4px solid var(--success);
  margin-bottom:12px;
}

.tree-history { margin-top:20px; }
.tree-history h4 { font-size:0.95rem; margin-bottom:8px; color:var(--text-secondary); }
.history-item {
  font-size:0.85rem;
  padding:6px 0;
  border-bottom:1px solid var(--border);
  color:var(--text-secondary);
}

.tree-select {
  width:100%;
  padding:10px 14px;
  border:1.5px solid var(--border);
  border-radius:var(--radius);
  font-size:0.95rem;
  margin-bottom:12px;
  outline:none;
  background:var(--card);
}

/* ===== 管理页 ===== */
.admin-section { margin-bottom:24px; }
.admin-section h3 { font-size:1.05rem; margin-bottom:12px; }

.form-group { margin-bottom:12px; }
.form-group label { display:block; margin-bottom:4px; font-weight:500; font-size:0.9rem; }
.form-group input,
.form-group textarea,
.form-group select {
  width:100%;
  padding:10px 14px;
  border:1.5px solid var(--border);
  border-radius:var(--radius);
  font-size:0.95rem;
  outline:none;
  font-family:inherit;
}

.form-group textarea { min-height:120px; resize:vertical; }
.form-group input:focus,
.form-group textarea:focus { border-color:var(--primary); }

.tag-input {
  display:flex; flex-wrap:wrap; gap:4px;
  padding:6px; border:1.5px solid var(--border);
  border-radius:var(--radius); min-height:40px;
  align-items:center;
}

.tag-input input { flex:1; border:none; min-width:60px; padding:4px; }
.tag-input input:focus { box-shadow:none; }
.tag-input-row {
  display:flex; align-items:center; flex:1; min-width:120px;
}
.tag-input-row input {
  border:none; outline:none; padding:4px; flex:1; min-width:60px;
}
.tag-add-btn {
  border:none; background:var(--primary); color:#fff;
  border-radius:4px; width:24px; height:24px; font-size:16px; line-height:1;
  cursor:pointer; padding:0; margin-left:4px; flex-shrink:0;
}

.tag-item {
  display:inline-flex; align-items:center; gap:4px;
  background:#e8f0fe; color:var(--primary);
  padding:2px 8px; border-radius:4px; font-size:0.85rem;
}

.tag-item .tag-remove { cursor:pointer; font-size:0.8rem; }

.btn-primary {
  padding:10px 24px;
  background:var(--primary);
  color:#fff;
  border:none;
  border-radius:var(--radius);
  cursor:pointer;
  font-size:0.95rem;
}

.btn-primary:hover { background:var(--primary-dark); }

.btn-secondary {
  padding:10px 24px;
  background:var(--bg);
  color:var(--text);
  border:1px solid var(--border);
  border-radius:var(--radius);
  cursor:pointer;
  font-size:0.95rem;
}

.btn-secondary:hover { background:var(--border); }

.btn-info {
  padding:10px 24px;
  background:#5b9bd5;
  color:#fff;
  border:none;
  border-radius:var(--radius);
  cursor:pointer;
  font-size:0.95rem;
}

.btn-info:hover { background:#4a8ac4; }

.btn-warn {
  padding:10px 24px;
  background:var(--warning, #e6a817);
  color:#fff;
  border:none;
  border-radius:var(--radius);
  cursor:pointer;
  font-size:0.95rem;
}

.btn-small {
  padding:4px 10px;
  border:1px solid var(--border);
  border-radius:6px;
  background:var(--card);
  cursor:pointer;
  font-size:0.8rem;
}

.btn-sm {
  padding:6px 14px;
  font-size:0.85rem;
}

.fault-list-item {
  background:var(--card);
  padding:10px 14px;
  border-radius:8px;
  margin-bottom:6px;
  display:flex;
  justify-content:space-between;
  align-items:center;
}

.fault-list-item .edit-btn,
.fault-list-item .delete-btn {
  padding:4px 10px;
  border-radius:6px;
  cursor:pointer;
  font-size:0.8rem;
}

.fault-list-item .edit-btn {
  border:1px solid var(--primary);
  color:var(--primary);
  background:none;
}

.fault-list-item .delete-btn {
  border:1px solid var(--error);
  color:var(--error);
  background:none;
}

/* ===== Admin Tabs ===== */
.admin-tabs {
  display:flex;
  gap:8px;
  margin-bottom:16px;
}

.admin-tab {
  padding:8px 20px;
  border:1.5px solid var(--border);
  border-radius:var(--radius);
  background:var(--card);
  cursor:pointer;
  font-size:0.95rem;
  transition: all 0.15s;
}

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

.admin-sub { display:none; }
.admin-sub.active { display:block; }

/* ===== Toast / 加载 ===== */
.toast {
  position:fixed; top:16px; left:50%; transform:translateX(-50%);
  padding:10px 24px; border-radius:8px;
  color:#fff; font-size:0.9rem; z-index:200;
  animation: fadeIn 0.3s;
}

.toast.success { background:var(--success); }
.toast.error { background:var(--error); }

@keyframes fadeIn { from{opacity:0;transform:translateX(-50%) translateY(-10px);} to{opacity:1;transform:translateX(-50%) translateY(0);} }

.loading-dots::after {
  content: '';
  animation: dots 1.5s steps(3, end) infinite;
}

.elapsed-time {
  font-size: 0.7rem;
  color: var(--text-tertiary, #999);
  margin-bottom: 4px;
  opacity: 0.7;
}

@keyframes dots {
  0% { content: ''; }
  33% { content: '.'; }
  66% { content: '..'; }
  100% { content: '...'; }
}

/* ===== 响应式 ===== */
@media (max-width: 800px) {
  .mode-cards { grid-template-columns: 1fr; }
  .app-header h1 { font-size: 1rem; }
  .page { padding: 12px; padding-bottom: 72px; }
  .message { max-width: 92%; }
}

/* ===== 弹窗 ===== */
.modal-overlay {
  display:none;
  position:fixed; top:0; left:0; right:0; bottom:0;
  background:rgba(0,0,0,0.5); z-index:1000;
  align-items:center; justify-content:center;
}
.modal-overlay.active { display:flex; }
.modal-box {
  background:var(--card); border-radius:12px; width:90%; max-width:600px;
  max-height:85vh; display:flex; flex-direction:column;
  box-shadow:0 8px 32px rgba(0,0,0,0.2);
}
.modal-header {
  display:flex; justify-content:space-between; align-items:center;
  padding:16px 20px; border-bottom:1px solid var(--border);
}
.modal-header h3 { margin:0; }
.modal-close {
  border:none; background:none; font-size:1.3rem;
  cursor:pointer; color:var(--text-secondary);
}
.modal-body {
  padding:16px 20px; overflow-y:auto; flex:1;
}
.modal-footer {
  padding:12px 20px; border-top:1px solid var(--border);
  display:flex; gap:8px; justify-content:flex-end;
}

/* 表头+按钮 */
.section-header {
  display:flex; justify-content:space-between; align-items:center;
  margin-bottom:12px;
}
.section-header h3 { margin:0; }

/* 故障上报 */
.report-filters {
  display:flex; gap:8px; margin-bottom:12px; flex-wrap:wrap;
}
.report-filters select,
.report-filters input {
  padding:8px 12px;
  border:1.5px solid var(--border);
  border-radius:var(--radius);
  font-size:0.9rem;
  outline:none;
}
.report-filters select { min-width:100px; }
.report-filters input { flex:1; min-width:150px; }
.report-filters input:focus { border-color:var(--primary); }

.form-row { display:flex; gap:12px; }
.form-row .form-group { flex:1; }

/* 故障树步骤构建器 */
.tree-step-builder {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 12px;
}
.tree-branches { display:flex; flex-direction:column; gap:8px; }
.tree-branch {
  display:flex; align-items:flex-start; gap:6px;
}
.tree-branch .branch-label {
  font-size:0.85rem; font-weight:600; padding:4px 8px;
  border-radius:6px; white-space:nowrap; min-width:48px; text-align:center;
}
.tree-branch .branch-label.yes { background:#e8f5e9; color:#1e8e3e; }
.tree-branch .branch-label.no { background:#fce8e6; color:#d93025; }
.tree-branch .branch-fields { display:flex; gap:6px; align-items:center; flex:1; flex-wrap:wrap; }
.tree-branch .branch-fields input {
  padding:6px 10px; border:1.5px solid var(--border);
  border-radius:6px; font-size:0.85rem; outline:none; min-width:80px;
}
.tree-branch .branch-fields input:focus { border-color:var(--primary); }

.tree-steps-list { margin-top:8px; }
.tree-step-item {
  background: var(--card);
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding:10px 12px;
  margin-bottom:8px;
}
.tree-step-item .step-header {
  display:flex; justify-content:space-between; align-items:center;
  font-weight:600; font-size:0.9rem; margin-bottom:6px;
}
.tree-step-item .step-header .step-actions { display:flex; gap:4px; }
.tree-step-item .step-header .step-actions button {
  border:none; background:none; cursor:pointer; font-size:0.85rem;
  padding:2px 6px; border-radius:4px;
}
.tree-step-item .step-header .step-actions .step-edit { color:var(--primary); }
.tree-step-item .step-header .step-actions .step-del { color:var(--error); }
.tree-step-item .step-body { font-size:0.85rem; color:var(--text-secondary); line-height:1.5; }
.tree-step-item .step-body .step-row { margin-bottom:2px; }

/* 编辑态 */
.tree-step-item.editing { border-color:var(--primary); background:#f8faff; }
.tree-step-item.editing .step-body-edit { display:flex; flex-direction:column; gap:8px; }
.tree-step-item.editing .step-body-edit .form-group { margin-bottom:4px; }
.tree-step-item.editing .step-body-edit .form-group label { font-size:0.8rem; font-weight:600; display:block; margin-bottom:2px; }
.tree-step-item.editing .step-body-edit .form-group input,
.tree-step-item.editing .step-body-edit .tree-branch input {
  padding:6px 10px; border:1.5px solid var(--border);
  border-radius:6px; font-size:0.85rem; outline:none; width:100%; box-sizing:border-box;
}
.tree-step-item.editing .step-body-edit .form-group input:focus,
.tree-step-item.editing .step-body-edit .tree-branch input:focus { border-color:var(--primary); }
.tree-step-item.editing .step-body-edit .tree-branches { gap:6px; }
.tree-step-item.editing .step-body-edit .tree-branch {
  display:flex; align-items:center; gap:4px; flex-wrap:wrap;
}
.tree-step-item.editing .step-body-edit .tree-branch input { width:auto; flex:1; min-width:80px; }
.tree-step-item .step-header .step-actions .step-done {
  color: #1e8e3e; font-weight:600;
}
.tree-step-item .step-header .step-actions .step-cancel { color:var(--error); }

.form-section { margin-bottom:12px; }
.form-section > label { font-weight:600; font-size:0.9rem; display:block; margin-bottom:8px; }

/* 故障类型切换 Tab */
.fault-type-tabs { display:flex; gap:6px; }
.fault-type-tab {
  padding:6px 16px;
  border:1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  cursor:pointer;
  font-size:0.88rem;
  transition: all 0.15s;
}
.fault-type-tab.active { background:var(--primary); color:#fff; border-color:var(--primary); }

.image-preview-grid {
  display:flex; flex-wrap:wrap; gap:8px; margin-top:8px;
}
.image-preview-item {
  position:relative;
  width:72px; height:72px;
  border-radius:6px; overflow:hidden;
  border:1px solid var(--border);
}
.image-preview-item img {
  width:100%; height:100%; object-fit:cover; cursor:pointer;
}
.image-preview-item .remove-img {
  position:absolute; top:2px; right:2px;
  background:rgba(0,0,0,0.6); color:#fff;
  border-radius:50%; width:18px; height:18px;
  font-size:11px; line-height:18px; text-align:center;
  cursor:pointer;
}