:root {
  --bg:#f0f2f5; --card:#ffffff; --hover:#f0f2f5;
  --border:#e2e8f0; --border-h:#cbd5e1;
  --text:#1e293b; --muted:#64748b; --dim:#94a3b8;
  --blue:#0284c7; --blue-bg:#f0f9ff; --green:#16a34a; --green-bg:#f0fdf4;
  --orange:#d97706; --orange-bg:#fffbeb; --red:#dc2626;
  --mono:'SF Mono','Cascadia Code','JetBrains Mono',monospace;
  --sans:'Inter','PingFang SC','Microsoft YaHei',-apple-system,BlinkMacSystemFont,'Segoe UI',system-ui,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;min-width:0}
html{background:#0284c7}

/* ===== 居中布局 ===== */
body{
  background:#0284c7;color:var(--text);font-family:var(--sans);
  line-height:1.5;min-height:100vh;margin:0;padding:0;
  display:flex;justify-content:center;
}
.phone-frame{
  width:100%;max-width:480px;min-height:100vh;
  background:var(--bg);display:flex;flex-direction:column;
  box-shadow:0 0 30px rgba(0,0,0,.1);
}

/* ===== 天空蓝头部 ===== */
.header{
  background:linear-gradient(180deg,#0284c7 0%,#0ea5e9 20%,#38bdf8 40%,#7dd3fc 60%,#bae6fd 80%,#ffffff 100%);
  padding:24px 20px 20px;
  text-align:center;
  flex-shrink:0;
  position:relative;
}
.header::after{display:none}
.admin-icon{
  position:absolute;top:14px;right:14px;
  font-size:16px;color:#475569;text-decoration:none;
  width:28px;height:28px;display:flex;
  align-items:center;justify-content:center;
  border-radius:6px;transition:all .15s;z-index:2;
  background:rgba(255,255,255,.3);
}
.admin-icon:hover{background:rgba(255,255,255,.6);color:#1e293b}
.logo{
  font-size:20px;font-weight:700;color:#075985;letter-spacing:.5px;
  line-height:1.4;
}
.logo span{color:#0284c7;font-weight:400}
.sub{color:#475569;font-size:12px;margin-top:4px}
.header-status{
  display:flex;align-items:center;justify-content:center;
  gap:4px;font-size:10px;color:#475569;
  margin-top:5px;
}
.dot{
  width:4px;height:4px;border-radius:50%;background:#16a34a;
  display:inline-block;box-shadow:0 0 5px rgba(22,163,74,.4);
}

/* Main scrollable area */
.main{
  flex:1;display:flex;flex-direction:column;
  overflow-y:auto;overflow-x:hidden;padding:10px 12px 12px;
  -webkit-overflow-scrolling:touch;
}

/* Tabs */
.tabs{
  display:flex;gap:2px;background:var(--card);border:1px solid var(--border);
  border-radius:8px;padding:2px;margin:0 auto 10px;flex-shrink:0;
  box-shadow:0 1px 2px rgba(0,0,0,.04);width:fit-content;
}
.tab{
  padding:5px 12px;font-size:11px;color:var(--muted);cursor:pointer;
  border-radius:6px;transition:all .15s;border:none;
  background:none;font-family:var(--sans);white-space:nowrap;font-weight:500;
}
.tab.active{background:var(--blue);color:#fff;font-weight:500}
.tab:hover:not(.active){color:var(--text);background:var(--hover)}

/* Selector - grid 2 列 */
.selector{
  display:grid;grid-template-columns:1fr 1fr;gap:8px;
  margin-bottom:10px;flex-shrink:0;
}
.select-wrap{flex:1;position:relative}
.select-wrap select{
  width:100%;padding:7px 26px 7px 9px;
  font-size:11px;font-family:var(--sans);
  background:var(--card);color:var(--text);border:1px solid var(--border);border-radius:8px;
  outline:none;cursor:pointer;appearance:none;transition:all .15s;
  box-shadow:0 1px 2px rgba(0,0,0,.04);
}
.select-wrap select:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(2,132,199,.12)}
.select-wrap::after{content:'▾';position:absolute;right:8px;top:50%;transform:translateY(-50%);color:var(--dim);pointer-events:none;font-size:7px}

/* Search */
.search-box{position:relative;margin-bottom:12px;flex-shrink:0}
.search-input{
  width:100%;padding:9px 12px;padding-right:40px;font-size:12px;font-family:var(--sans);
  background:var(--card);color:var(--text);border:1px solid var(--border);border-radius:10px;
  outline:none;transition:all .15s;box-shadow:0 1px 2px rgba(0,0,0,.04);
}
.search-input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(2,132,199,.12)}
.search-input::placeholder{color:var(--dim);font-size:11px}
.search-btn{
  position:absolute;right:4px;top:50%;transform:translateY(-50%);
  width:30px;height:30px;border:none;border-radius:7px;background:var(--blue);
  color:#fff;font-size:14px;cursor:pointer;display:flex;
  align-items:center;justify-content:center;transition:all .15s;
}
.search-btn:hover{background:#0369a1}
.search-btn:disabled{opacity:.4;cursor:not-allowed}

/* Loading */
.loading{display:none;text-align:center;padding:20px;color:var(--muted);flex-shrink:0}
.loading.active{display:block}
.spinner{
  display:inline-block;width:20px;height:20px;
  border:3px solid var(--border);border-top-color:var(--blue);
  border-radius:50%;animation:spin .8s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}

/* Results area */
#results,#diagResults{
  flex:1;overflow-y:auto;overflow-x:hidden;
  min-height:0;scroll-behavior:smooth;margin-bottom:4px;
}

/* Result item (备用) */
.result{
  background:var(--card);border:1px solid var(--border);border-radius:10px;
  padding:12px 14px;margin-bottom:8px;animation:fadeIn .2s;
  box-shadow:0 1px 3px rgba(0,0,0,.04);
}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}
.answer{font-size:12px;line-height:1.6;white-space:pre-wrap;word-break:break-word;color:var(--text)}
.sources{margin-top:10px;padding-top:10px;border-top:1px solid var(--border)}
.sources-title{font-size:10px;font-weight:600;color:var(--muted);margin-bottom:5px}
.source{
  padding:6px 10px;background:var(--bg);border:1px solid var(--border);border-radius:6px;
  margin-bottom:4px;font-size:11px;cursor:pointer;transition:all .15s;
}
.source:hover{border-color:var(--border-h);background:var(--hover)}
.source-meta{display:flex;gap:8px;align-items:center;font-size:9px;color:var(--muted);font-family:var(--mono);margin-bottom:2px}
.source-text{color:var(--muted);line-height:1.4;font-size:11px}
.score{color:var(--blue);font-weight:600}

/* ===== 维修指引卡片 (新设计) ===== */
.guide-card{
  background:var(--card);border-radius:12px;
  box-shadow:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);
  overflow:hidden;margin-bottom:10px;animation:fadeIn .25s;
}
.guide-header{
  padding:14px 16px 10px;
  display:flex;justify-content:space-between;align-items:flex-start;
}
.guide-code{font-size:18px;font-weight:700;color:var(--text)}
.guide-code small{font-weight:400;font-size:11px;color:var(--muted);margin-left:8px}
.guide-source-tag{font-size:9px;padding:3px 8px;border-radius:4px;background:var(--blue-bg);color:var(--blue);font-weight:500;white-space:nowrap}
.guide-body{padding:0 16px 14px}
.guide-section{margin-bottom:12px}
.guide-section:last-child{margin-bottom:0}
.guide-section-title{font-size:11px;font-weight:600;color:var(--muted);margin-bottom:5px;letter-spacing:.3px}
.guide-section-title .icon{font-size:12px;margin-right:2px}
.guide-text{font-size:13px;line-height:1.7;color:#334155}
.guide-step{
  padding:6px 10px 6px 28px;position:relative;
  font-size:13px;line-height:1.5;color:#334155;
  background:#f8fafc;border-radius:6px;margin-bottom:4px;
}
.guide-step::before{
  content:attr(data-n);position:absolute;left:8px;top:7px;
  width:16px;height:16px;border-radius:50%;
  background:var(--blue);color:#fff;
  font-size:9px;font-weight:600;display:flex;align-items:center;justify-content:center;
}
.guide-highlight{background:var(--orange-bg);border:1px solid #fde68a;border-radius:8px;padding:8px 12px;font-size:13px;color:#92400e;line-height:1.5;margin-bottom:10px}
.guide-divider{border:none;border-top:1px solid #f1f5f9;margin:10px 0}
.guide-source{font-size:11px;color:var(--dim);display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.guide-source a{color:var(--blue);cursor:pointer;text-decoration:none;font-weight:500}
.guide-source a:hover{text-decoration:underline}
.guide-tag{font-size:9px;padding:1px 5px;border-radius:4px;margin-left:4px;white-space:nowrap}
.guide-tag-green{background:var(--green-bg);color:var(--green)}
.guide-tag-blue{background:var(--blue-bg);color:var(--blue)}

/* AI in guide */
.guide-ai-area{margin-top:12px;padding-top:12px;border-top:1px dashed #e2e8f0}
.guide-ai-btn{
  width:100%;padding:10px;border:none;border-radius:8px;
  background:linear-gradient(135deg,#0284c7,#0369a1);color:#fff;
  font-size:12px;font-weight:600;font-family:inherit;cursor:pointer;
  transition:all .15s;box-shadow:0 2px 8px rgba(2,132,199,.25);
}
.guide-ai-btn:hover{opacity:.9}
.guide-ai-btn:disabled{opacity:.4;cursor:not-allowed}
.guide-ai-loading{text-align:center;padding:8px;color:var(--muted);font-size:12px}
.guide-ai-content{padding:2px 0;font-size:13px;line-height:1.7;color:#334155}
.guide-ai-content .ai-section{margin-bottom:6px}
.guide-ai-content .ai-section-title{font-weight:600;color:var(--blue);margin-bottom:2px}

/* Expert experience */
.exp-section{background:#fafbfc;border-top:1px solid #f1f5f9;padding:12px 16px 14px}
.exp-title{font-size:12px;font-weight:600;color:var(--muted);margin-bottom:8px}
.exp-form label{font-size:11px;color:var(--dim);display:block;margin-bottom:2px}
.exp-form input,.exp-form textarea{
  width:100%;padding:7px 10px;border:1px solid var(--border);border-radius:8px;
  font-size:12px;outline:none;font-family:var(--sans);background:var(--card);
  transition:border-color .15s;
}
.exp-form input:focus,.exp-form textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(2,132,199,.12)}
.exp-form textarea{resize:vertical;min-height:40px}
.exp-form .form-row{display:flex;gap:8px;margin-bottom:6px}
.exp-form .form-row>*{flex:1}
.exp-submit-btn{width:100%;padding:8px;background:var(--blue);color:#fff;border:none;border-radius:8px;font-size:12px;font-weight:600;font-family:inherit;cursor:pointer;margin-top:4px;transition:all .15s}
.exp-submit-btn:hover{background:#0369a1}
.exp-submit-btn:disabled{opacity:.5;cursor:not-allowed}
.exp-note{font-size:10px;color:var(--dim);text-align:center;margin-top:5px}
.exp-success{text-align:center;padding:8px;color:var(--green);font-size:12px;font-weight:500}

/* Subcode list */
.subcode-item{
  display:flex;align-items:center;justify-content:space-between;
  padding:8px 12px;margin-bottom:5px;border:1px solid var(--border);
  border-radius:8px;cursor:pointer;transition:all .15s;
}
.subcode-item:hover{background:var(--blue-bg);border-color:var(--blue)}
.subcode-badge{font-family:var(--mono);font-size:13px;font-weight:600;color:var(--text)}

/* Feedback area */
#feedbackArea{
  flex-shrink:0;margin-top:6px;padding:6px 10px;
  background:var(--card);border:1px solid var(--border);border-radius:8px;
}
#feedbackArea button{padding:4px 12px;border:none;border-radius:5px;font-size:11px;cursor:pointer}

/* Upload panel */
#tab-upload{
  margin-top:8px;padding:12px 14px;background:var(--card);
  border:2px dashed #bfdbfe;border-radius:12px;text-align:center;
}
.upload-section{margin-top:16px;padding-top:14px;border-top:1px solid var(--border)}
.upload-area{
  background:var(--card);border:2px dashed var(--border);border-radius:10px;
  padding:20px;text-align:center;cursor:pointer;transition:all .15s;
}
.upload-area:hover{border-color:var(--blue);background:var(--blue-bg)}
.upload-area.dragover{border-color:var(--green);background:var(--green-bg)}
.upload-icon{font-size:28px;margin-bottom:4px}
.upload-text{color:var(--muted);font-size:12px}
.upload-hint{color:var(--dim);font-size:10px;margin-top:3px}
.upload-progress{margin-top:10px}
.progress-bar{height:3px;background:var(--border);border-radius:2px;overflow:hidden}
.progress-fill{height:100%;background:var(--blue);width:0;transition:width .3s;border-radius:2px}
.progress-fill.pulsing{background:linear-gradient(90deg,var(--blue),#60a5fa,var(--blue));background-size:200% 100%;animation:pulseBar 1.2s ease infinite}
@keyframes pulseBar{0%{background-position:200% 0}100%{background-position:-200% 0}}
.progress-text{font-size:11px;color:var(--muted);margin-top:6px;text-align:center}

/* ===== 批量上传任务列表 ===== */
.file-item{display:flex;align-items:center;gap:6px;padding:4px 8px;margin:3px 0;background:var(--blue-bg);border:1px solid #c4d8f6;border-radius:6px;font-size:11px}
.file-item .file-icon{font-size:12px;flex-shrink:0}
.file-item .file-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:500}
.file-item .file-size{color:var(--muted);font-size:10px;flex-shrink:0}
.file-item .file-remove{background:none;border:none;color:#e74c3c;cursor:pointer;font-size:13px;padding:0 2px;line-height:1;flex-shrink:0;opacity:.6;transition:opacity .15s}
.file-item .file-remove:hover{opacity:1}
.upload-task{margin:6px 0;padding:6px 8px;background:var(--card);border:1px solid var(--border);border-radius:8px}
.upload-task .task-header{display:flex;align-items:center;gap:5px;margin-bottom:4px}
.upload-task .task-status{font-size:13px;flex-shrink:0;width:16px;text-align:center}
.upload-task .task-name{flex:1;font-size:11px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#333}
.upload-task .task-retry{background:none;border:1px solid var(--border);color:var(--muted);padding:1px 5px;border-radius:4px;cursor:pointer;font-size:10px;flex-shrink:0}
.upload-task .task-retry:hover{background:#fef3c7;border-color:#f59e0b;color:#d97706}
.upload-task .task-bar-wrap{display:flex;align-items:center;gap:6px}
.upload-task .task-bar{flex:1;height:4px;background:#e5e7eb;border-radius:3px;overflow:hidden}
.upload-task .task-fill{height:100%;background:var(--blue);width:0;transition:width .4s ease;border-radius:3px}
.upload-task .task-pct{font-size:10px;font-family:var(--mono);color:var(--blue);font-weight:600;min-width:32px;text-align:right}
.upload-task .task-msg{font-size:10px;color:var(--muted);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* Toast */
.toast{
  display:none;position:fixed;bottom:24px;left:50%;transform:translateX(-50%);
  background:#1e293b;color:#fff;padding:8px 16px;border-radius:8px;
  font-size:12px;z-index:100;box-shadow:0 4px 12px rgba(0,0,0,.15);
  max-width:90%;text-align:center;pointer-events:none;
}
.toast.show{display:block}
.toast.error{background:var(--red)}

/* Modal */
.modal-overlay{
  display:none;position:absolute;top:0;left:0;right:0;bottom:0;
  background:rgba(0,0,0,.4);z-index:1000;align-items:center;justify-content:center;
}
.modal-overlay.active{display:flex}
.modal-box{
  background:#fff;border-radius:12px;max-width:90%;width:340px;
  max-height:70vh;overflow-y:auto;padding:16px;box-shadow:0 8px 30px rgba(0,0,0,.12);
}
.modal-box h3{font-size:14px;margin-bottom:8px;color:var(--text)}
.modal-close{float:right;font-size:16px;color:#999;cursor:pointer;border:none;background:none;padding:0 4px}
.modal-close:hover{color:#333}
.modal-ref{font-size:12px;line-height:1.6;color:#444;white-space:pre-wrap;background:#f9f9f9;padding:8px;border-radius:6px;max-height:350px;overflow-y:auto}

/* Hide scrollbar */
#results::-webkit-scrollbar,#diagResults::-webkit-scrollbar,.main::-webkit-scrollbar,
.guide-card::-webkit-scrollbar{width:3px}
#results::-webkit-scrollbar-thumb,#diagResults::-webkit-scrollbar-thumb,
.main::-webkit-scrollbar-thumb,.guide-card::-webkit-scrollbar-thumb{background:#d1d5db;border-radius:3px}

/* Desktop only */
@media(min-width:481px){
}
@media(max-width:480px){
  body{background:var(--bg)}
}
/* Very small phones */
@media(max-width:360px){
  .tab{padding:5px 10px;font-size:10px}
  .header{padding:14px 12px 10px}
  .search-input{font-size:11px;padding:8px 10px;padding-right:36px}
  .selector{grid-template-columns:1fr 1fr;gap:6px}
}