:root {
    --gold: #126DFF;
    --gold-light: #6EA8FF;
    --gold-dark: #7C3AED;
    --gold-pale: rgba(18,109,255,0.08);
    --bg-primary: #F6F8FC;
    --bg-secondary: #EEF3FF;
    --bg-card: #FFFFFF;
    --bg-card2: #F8FBFF;
    --text-primary: #0B1020;
    --text-secondary: #5B6475;
    --text-muted: #8A94A8;
    --border: rgba(18,109,255,0.18);
    --border-light: rgba(18,109,255,0.08);
    --sidebar-w: 260px;
  }
  * { margin:0; padding:0; box-sizing:border-box; }
  [hidden] { display:none !important; }
  html, body { height:100%; overflow:hidden; }
  body {
    font-family: 'Noto Sans SC', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
  }

  /* ── Background texture ── */
  body::before {
    content:'';
    position:fixed; inset:0;
    background:
      radial-gradient(ellipse 80% 60% at 50% 0%, rgba(18,109,255,0.06) 0%, transparent 60%),
      radial-gradient(ellipse 40% 40% at 90% 80%, rgba(18,109,255,0.04) 0%, transparent 50%);
    pointer-events:none; z-index:0;
  }

  /* ── TOP NAV ── */
  nav {
    position: relative; z-index:100;
    display: grid; grid-template-columns: minmax(240px, 1fr) auto minmax(240px, 1fr); align-items: center;
    padding: 0 32px;
    height: 64px;
    border-bottom: 1px solid var(--border);
    background: rgba(246,248,252,0.94);
    backdrop-filter: blur(20px);
    flex-shrink: 0;
  }
  .nav-logo { display:flex; align-items:center; gap:14px; text-decoration:none; justify-self:start; }
  .nav-logo-mark {
    width: 136px; height: 42px;
    display:block; object-fit:contain; flex-shrink:0;
  }
  .nav-logo-text { line-height:1.2; }
  .nav-logo-text .cn { font-family:'Noto Serif SC',serif; font-size:16px; font-weight:500; color:var(--text-primary); letter-spacing:2px; }
  .nav-logo-text .en { font-size:9px; color:var(--gold); letter-spacing:3px; font-family:'Cinzel',serif; }
  .nav-tabs { display:flex; gap:4px; justify-self:center; }
  .nav-tab {
    display:flex; align-items:center; justify-content:center; gap:7px;
    padding:7px 17px; border-radius:6px;
    font-size:13px; font-weight:400; color:var(--text-secondary);
    cursor:pointer; transition:color 0.2s, background-color 0.2s, border-color 0.2s; border:1px solid transparent; background:none;
    text-decoration:none; letter-spacing:0.5px; white-space:nowrap; flex-shrink:0;
  }
  .nav-tab svg { width:15px; height:15px; opacity:0.6; }
  .nav-tab:hover { color:var(--text-primary); background:var(--gold-pale); }
  .nav-tab.active { color:var(--gold); background:var(--gold-pale); border-color:var(--border); }
  .nav-tab.active svg { opacity:1; }
  .nav-right { display:flex; align-items:center; gap:12px; justify-self:end; }
  .workspace-btn, .dealer-chip {
    display:flex; align-items:center; gap:6px;
    height:36px; padding:0 14px; border-radius:7px;
    border:1px solid var(--border);
    font-size:13px; color:var(--text-secondary); letter-spacing:0.3px;
    background:var(--bg-card);
  }
  .workspace-btn { cursor:pointer; font-family:'Noto Sans SC',sans-serif; }
  .workspace-btn:hover { color:var(--gold); border-color:var(--gold-light); background:var(--gold-pale); }
  .switch-icon { width:15px; height:15px; stroke-width:1.6; }
  .dealer-chip {
    border:0; border-radius:18px; color:var(--gold-dark);
    background:rgba(18,109,255,0.12); font-size:12px;
  }
  .mobile-drawer-btn {
    display:none; width:36px; height:36px; border:0; border-radius:0;
    background:transparent; color:var(--text-secondary);
    align-items:center; justify-content:center; cursor:pointer;
  }
  .mobile-drawer-btn svg { width:18px; height:18px; }
  .mobile-drawer-mask { display:none; }
  .mobile-route-btn {
    display:none; width:28px; height:36px; border:0; background:transparent;
    color:var(--text-secondary); align-items:center; justify-content:center; cursor:pointer;
  }
  .mobile-route-btn svg { width:16px; height:16px; }
  .mobile-route-mask, .mobile-route-menu { display:none; }
  .mobile-route-menu {
    position:fixed; top:56px; right:14px; z-index:270;
    width:160px; padding:8px; border-radius:12px;
    background:rgba(255,255,255,0.96); border:1px solid var(--border-light);
    box-shadow:0 16px 42px rgba(11,16,32,0.12);
  }
  .mobile-route-menu a {
    display:flex; align-items:center; height:38px; padding:0 12px;
    border-radius:8px; color:var(--text-secondary); text-decoration:none;
    font-size:13px;
  }
  .mobile-route-menu a.active,.mobile-route-menu a:hover {
    color:var(--gold); background:var(--gold-pale);
  }
  .avatar-btn {
    width:36px; height:36px; border-radius:50%;
    background:linear-gradient(135deg,var(--gold) 0%,var(--gold-dark) 100%);
    display:flex; align-items:center; justify-content:center;
    font-size:13px; font-weight:500; color:white; cursor:pointer;
    border:2px solid var(--border); flex-shrink:0;
  }

  /* ── MAIN LAYOUT ── */
  .main-layout {
    display: flex; flex: 1; overflow: hidden; position:relative; z-index:1;
  }

  /* ── SIDEBAR ── */
  .sidebar {
    width: var(--sidebar-w); flex-shrink:0;
    border-right: 1px solid var(--border-light);
    background: var(--bg-secondary);
    display: flex; flex-direction: column;
    padding: 20px 16px;
    gap: 6px; overflow-y:auto;
  }
  .sidebar-header {
    display:flex; align-items:center; justify-content:space-between;
    padding: 0 8px 14px;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 8px;
  }
  .sidebar-title { font-size:11px; color:var(--text-muted); letter-spacing:2px; font-family:'Cinzel',serif; }
  .new-chat-btn {
    display:flex; align-items:center; gap:6px;
    padding: 8px 14px; border-radius:6px;
    background: linear-gradient(135deg,var(--gold) 0%,var(--gold-dark) 100%);
    color: white; font-size:12px; font-weight:500;
    cursor:pointer; border:none; width:100%; justify-content:center;
    letter-spacing:0.5px; transition:opacity 0.2s;
    margin-bottom: 8px;
  }
  .new-chat-btn:hover { opacity:0.85; }
  .sidebar-group-label { font-size:10px; color:var(--text-muted); letter-spacing:1.5px; padding: 8px 10px 4px; }
  .sidebar-item {
    padding: 10px 12px; border-radius:8px; cursor:pointer;
    font-size:12px; color:var(--text-secondary); line-height:1.4;
    transition:all 0.15s; display:flex; align-items:center; gap:8px;
    border:1px solid transparent;
  }
  .sidebar-item:hover { color:var(--text-primary); background:var(--gold-pale); }
  .sidebar-item.active {
    color:var(--gold); background:var(--gold-pale);
    border-color:var(--border);
  }
  .sidebar-item svg { width:13px; height:13px; flex-shrink:0; opacity:0.5; }
  .sidebar-item.active svg { opacity:1; }
  .conversation-list { display:flex; flex-direction:column; gap:6px; }
  .sidebar-item-title { flex:1; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
  .sidebar-item-delete {
    flex-shrink:0; width:22px; height:22px; padding:0; margin:-2px -4px -2px 0;
    border:none; background:transparent; color:var(--text-muted); cursor:pointer;
    border-radius:6px; display:flex; align-items:center; justify-content:center;
    opacity:0.55; transition:opacity 0.15s, background 0.15s, color 0.15s;
  }
  .sidebar-item-delete svg { width:13px; height:13px; opacity:1; }
  .sidebar-item-delete:hover { opacity:1; background:rgba(192,57,43,0.12); color:#c0392b; }
  @media (hover:hover) and (pointer:fine) {
    .sidebar-item-delete { opacity:0; }
    .sidebar-item:hover .sidebar-item-delete { opacity:0.65; }
  }
  .sidebar-empty { padding:12px 10px; color:var(--text-muted); font-size:12px; line-height:1.7; }
  /* ── CHAT AREA ── */
  .chat-container {
    flex:1; display:flex; flex-direction:column; overflow:hidden;
    max-width: 860px; margin:0 auto; width:100%; padding:0 24px;
  }
  .chat-messages {
    flex:1; overflow-y:auto; padding:28px 0;
    display:flex; flex-direction:column; gap:24px;
  }
  .chat-messages::-webkit-scrollbar { width:4px; }
  .chat-messages::-webkit-scrollbar-track { background:transparent; }
  .chat-messages::-webkit-scrollbar-thumb { background:var(--border); border-radius:2px; }

  /* Welcome */
  .welcome-block { text-align:center; padding:40px 0 20px; }
  .welcome-icon {
    width:64px; height:64px; margin:0 auto 20px;
    background:linear-gradient(135deg,var(--gold) 0%,var(--gold-dark) 100%);
    clip-path:polygon(50% 0%,100% 25%,100% 75%,50% 100%,0% 75%,0% 25%);
    display:flex; align-items:center; justify-content:center;
  }
  .welcome-icon svg { width:32px; height:32px; fill:white; }
  .welcome-title {
    font-family:'Noto Serif SC',serif; font-size:26px; font-weight:500;
    color:var(--text-primary); letter-spacing:3px; margin-bottom:10px;
  }
  .welcome-title span { color:var(--gold); }
  .welcome-sub { font-size:13px; color:var(--text-secondary); line-height:1.7; letter-spacing:0.5px; }
  .suggestion-grid { display:grid; grid-template-columns:1fr 1fr; gap:10px; margin-top:28px; text-align:left; }
  .suggestion-card {
    padding:14px 16px; border-radius:10px;
    border:1px solid var(--border);
    background:var(--bg-card); cursor:pointer;
    transition:all 0.2s;
  }
  .suggestion-card:hover { border-color:var(--gold); background:var(--gold-pale); }
  .sc-label { font-size:10px; color:var(--gold); letter-spacing:1px; margin-bottom:4px; font-family:'Cinzel',serif; }
  .sc-text { font-size:12px; color:var(--text-secondary); line-height:1.5; }
  .sc-arrow { font-size:16px; color:var(--gold-dark); float:right; margin-top:-2px; }

  /* Messages */
  .msg-row { display:flex; gap:14px; align-items:flex-start; }
  .msg-row.user { flex-direction:row-reverse; }
  .msg-avatar {
    width:34px; height:34px; border-radius:50%; flex-shrink:0;
    display:flex; align-items:center; justify-content:center;
    font-size:12px; font-weight:500;
  }
  .msg-avatar.ai {
    background:linear-gradient(135deg,var(--gold) 0%,var(--gold-dark) 100%);
    color:white;
  }
  .msg-avatar.user {
    background:var(--bg-card2); color:var(--text-secondary);
    border:1px solid var(--border);
  }
  .msg-bubble {
    max-width:72%; padding:14px 18px; border-radius:12px;
    font-size:14px; line-height:1.75; letter-spacing:0.3px;
  }
  .msg-bubble.ai {
    background:var(--bg-card); border:1px solid var(--border-light);
    color:var(--text-primary); border-radius:4px 12px 12px 12px;
  }
  .msg-bubble.user {
    background:linear-gradient(135deg,var(--gold) 0%,var(--gold-dark) 100%);
    color:white; border-radius:12px 4px 12px 12px;
  }
  .msg-bubble p { margin:0 0 10px; }
  .msg-bubble p:last-child { margin-bottom:0; }
  .msg-bubble ul, .msg-bubble ol { margin:6px 0 10px; padding-left:22px; }
  .msg-bubble ul:last-child, .msg-bubble ol:last-child { margin-bottom:0; }
  .msg-bubble li { margin:3px 0; }
  .msg-bubble strong { font-weight:700; }
  .msg-bubble h3, .msg-bubble h4, .msg-bubble h5 { margin:10px 0 6px; font-size:15px; font-weight:700; }
  .msg-bubble h3:first-child, .msg-bubble h4:first-child, .msg-bubble h5:first-child { margin-top:0; }
  .msg-bubble code { font-family:'SFMono-Regular',Consolas,Menlo,monospace; font-size:0.92em; padding:1px 5px; border-radius:4px; background:rgba(18,109,255,0.1); }
  .msg-bubble.user code { background:rgba(255,255,255,0.22); }
  .msg-chips { display:flex; gap:8px; flex-wrap:wrap; margin-top:12px; }
  .msg-chip {
    padding:5px 13px; border-radius:20px; font-size:11px;
    border:1px solid var(--border); color:var(--gold);
    cursor:pointer; background:none; font-family:'Noto Sans SC',sans-serif;
    transition:all 0.15s; letter-spacing:0.3px;
  }
  .msg-chip:hover { background:var(--gold-pale); }
  .action-cards { display:flex; gap:10px; margin-top:14px; flex-wrap:wrap; }
  .action-card {
    display:flex; align-items:center; gap:8px;
    padding:10px 14px; border-radius:8px;
    border:1px solid var(--border); background:var(--bg-card2);
    cursor:pointer; transition:all 0.2s; text-decoration:none;
  }
  .action-card:hover { border-color:var(--gold); }
  .action-card svg { width:16px; height:16px; fill:var(--gold); }
  .action-card span { font-size:12px; color:var(--text-secondary); }
  .typing-indicator { display:flex; gap:4px; align-items:center; padding:4px 0; }
  .typing-dot { width:6px; height:6px; border-radius:50%; background:var(--gold); animation:blink 1.2s infinite; }
  .typing-dot:nth-child(2){ animation-delay:.2s; }
  .typing-dot:nth-child(3){ animation-delay:.4s; }
  @keyframes blink { 0%,80%,100%{opacity:0.2;} 40%{opacity:1;} }

  /* Input area */
  .chat-input-area {
    padding:16px 0 24px; flex-shrink:0;
  }
  .input-wrapper {
    position:relative; border-radius:14px;
    border:1px solid var(--border);
    background:var(--bg-card);
    transition:border-color 0.2s;
  }
  .input-wrapper:focus-within { border-color:var(--gold); }
  .chat-input {
    width:100%; padding:16px 140px 16px 18px;
    background:transparent; border:none; outline:none;
    color:var(--text-primary); font-size:14px;
    font-family:'Noto Sans SC',sans-serif;
    resize:none; min-height:54px; max-height:160px;
    letter-spacing:0.3px; line-height:1.6;
  }
  .chat-input::placeholder { color:var(--text-muted); }
  .input-actions {
    position:absolute; right:12px; bottom:50%; transform:translateY(50%);
    display:flex; align-items:center; gap:8px;
  }
  .input-action-btn {
    padding:7px 16px; border-radius:8px; border:none;
    font-size:13px; cursor:pointer; font-family:'Noto Sans SC',sans-serif;
    transition:all 0.15s;
  }
  .input-action-btn.send {
    background:linear-gradient(135deg,var(--gold) 0%,var(--gold-dark) 100%);
    color:white; font-weight:500; letter-spacing:0.5px;
  }
  .input-action-btn.send:hover { opacity:0.85; transform:scale(0.97); }

  @media (max-width: 1080px) {
    nav {
      grid-template-columns:auto 1fr auto;
      padding:0 18px;
    }
    .nav-logo-text { display:none; }
    .nav-tab { padding:7px 12px; }
    .workspace-btn { padding:0 10px; }
  }

  @media (max-width: 820px) {
    html, body { height:100%; overflow:hidden; }
    nav {
      position:relative; height:88px; min-height:88px;
      display:grid; grid-template-columns:auto 1fr auto; grid-template-rows:48px 40px; align-items:center;
      padding:0 10px; gap:0 6px;
    }
    .nav-logo { justify-self:center; grid-column:2; grid-row:1; }
    .nav-logo-mark { width:96px; height:30px; }
    .nav-right { justify-self:end; width:auto; gap:6px; grid-column:3; grid-row:1; }
    .nav-tabs {
      grid-column:1 / -1; grid-row:2; display:flex; justify-self:stretch;
      gap:6px; overflow-x:auto; padding:3px 2px 7px; scrollbar-width:none;
    }
    .nav-tabs::-webkit-scrollbar { display:none; }
    .nav-tab { flex:1 1 0; min-width:0; padding:6px; font-size:12px; gap:5px; border-radius:16px; }
    .nav-tab svg { width:13px; height:13px; }
    .dealer-chip { display:none; }
    .mobile-drawer-btn { display:flex; grid-column:1; grid-row:1; }
    .mobile-route-btn { display:none; }
    body.mobile-route-open .mobile-route-mask {
      display:block; position:fixed; inset:0; z-index:240; background:transparent;
    }
    body.mobile-route-open .mobile-route-menu { display:block; }
    .workspace-btn {
      display:none !important;
    }
    .nav-recharge-btn { height:30px; padding:0 10px; gap:4px; font-size:12px; }
    .nav-recharge-coin { width:14px; height:14px; }
    .avatar-btn { width:32px; height:32px; border-width:1px; font-size:12px; flex-shrink:0; }

    .main-layout { min-height:0; z-index:auto; }
    .sidebar {
      position:fixed; top:88px; left:0; bottom:0; z-index:260;
      width:min(74vw, 290px); max-height:none;
      border-right:1px solid var(--border-light); border-left:0;
      border-bottom:0; box-shadow:18px 0 45px rgba(11,16,32,0.12);
      padding:20px 16px; gap:8px;
      overflow-y:auto; flex-shrink:0;
      transform:translateX(-104%);
      transition:transform 0.22s ease;
    }
    body.mobile-drawer-open { overflow:hidden; }
    body.mobile-drawer-open .sidebar { transform:translateX(0); }
    .mobile-drawer-mask {
      position:fixed; left:0; right:0; top:88px; bottom:0; z-index:250;
      background:rgba(11,16,32,0.28); backdrop-filter:blur(3px);
    }
    body.mobile-drawer-open .mobile-drawer-mask { display:block; }
    .new-chat-btn {
      width:100%; min-height:38px; margin-bottom:8px;
      position:static;
    }
    .conversation-list {
      display:flex; flex-direction:column; gap:6px;
      overflow:visible; padding-bottom:0;
    }
    .conversation-list::-webkit-scrollbar { width:4px; }
    .conversation-list::-webkit-scrollbar-thumb { background:var(--border); border-radius:3px; }
    .sidebar-group-label { flex:0 0 auto; align-self:auto; padding:8px 10px 4px; }
    .sidebar-item {
      flex:0 0 auto; max-width:none; min-height:38px;
      padding:10px 12px; white-space:normal;
    }
    .sidebar-empty { min-width:0; padding:12px 10px; }
    .chat-container { max-width:none; padding:0 16px; min-height:0; }
    .chat-messages { padding:18px 0; gap:18px; }
    .welcome-block { padding:18px 0 8px; }
    .welcome-icon { width:52px; height:52px; margin-bottom:14px; }
    .welcome-icon svg { width:26px; height:26px; }
    .welcome-title { font-size:22px; letter-spacing:1px; }
    .suggestion-grid { grid-template-columns:1fr; margin-top:20px; }
    .msg-bubble { max-width:82%; }
    .chat-input-area { padding:12px 0 calc(14px + env(safe-area-inset-bottom)); }
  }

  @media (max-width: 520px) {
    nav { padding-left:8px; padding-right:8px; }
    .sidebar { max-height:none; padding:20px 16px; }
    .chat-container { padding:0 12px; }
    .welcome-title { font-size:20px; }
    .welcome-sub { font-size:12px; }
    .msg-row { gap:9px; }
    .msg-avatar { width:30px; height:30px; }
    .msg-bubble {
      max-width:88%; padding:12px 14px;
      font-size:13px; line-height:1.65;
    }
    .chat-input { padding:14px 84px 14px 14px; min-height:50px; }
    .input-actions { right:8px; }
    .input-action-btn { padding:7px 13px; }
  }




  /* Jike AI refresh */
  nav {
    box-shadow: 0 10px 30px rgba(18,109,255,0.06);
  }
  .nav-logo-mark {
    filter: drop-shadow(0 6px 12px rgba(18,109,255,0.12));
  }
  .nav-tab.active {
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.7);
  }
  .sidebar {
    background:
      linear-gradient(180deg, rgba(238,243,255,0.98), rgba(246,248,252,0.96));
  }
  .chat-container {
    max-width: 920px;
  }
  .welcome-block {
    padding-top: 54px;
  }
  .welcome-icon {
    width:72px;
    height:72px;
    border-radius:20px;
    clip-path:none;
    background:linear-gradient(135deg, rgba(18,109,255,0.12), rgba(124,58,237,0.16));
    border:1px solid rgba(18,109,255,0.16);
    box-shadow:0 18px 44px rgba(18,109,255,0.14);
  }
  .welcome-icon svg {
    display:none;
  }
  .welcome-icon::before {
    content:'';
    width:56px;
    height:56px;
    background:url('https://jike-test-0603.oss-cn-qingdao.aliyuncs.com/web-static/favicon.png') center/contain no-repeat;
    display:block;
  }
  .welcome-title {
    font-family:'Noto Sans SC',sans-serif;
    font-size:30px;
    font-weight:700;
    letter-spacing:0;
  }
  .welcome-title span {
    background:linear-gradient(135deg, var(--gold), var(--gold-dark));
    -webkit-background-clip:text;
    background-clip:text;
    color:transparent;
  }
  .welcome-sub {
    color:#64748b;
  }
  .suggestion-card,
  .msg-bubble.ai,
  .input-wrapper {
    box-shadow:0 14px 38px rgba(15,23,42,0.06);
  }
  .input-wrapper {
    border-color:rgba(18,109,255,0.16);
  }
  .input-wrapper:focus-within {
    box-shadow:0 0 0 4px rgba(18,109,255,0.08), 0 16px 40px rgba(15,23,42,0.08);
  }

  @media (max-width: 820px) {
    .welcome-block { padding-top:24px; }
    .welcome-icon { width:60px; height:60px; border-radius:16px; }
    .welcome-icon::before { width:46px; height:46px; }
    .welcome-title { font-size:23px; }
  }