body { overflow: hidden; }
  .app { display: grid; grid-template-columns: 240px 1fr; height: 100vh; }

  /* 左侧栏 */
  .sidebar { background: var(--sidebar); border-right: 1px solid var(--border); display: flex; flex-direction: column; padding: 14px; }
  .sidebar .brand { display:block; font-weight:800; font-size:18px; padding: 6px 8px 16px; color:var(--text); text-decoration:none; }
  .new-chat { display:flex; align-items:center; gap:8px; padding:10px 12px; border:1px solid var(--border); border-radius:10px;
    cursor:pointer; font-size:14px; color:var(--text); transition:.15s; }
  .new-chat:hover { border-color:var(--teal); background:var(--grad-soft); }
  .side-label { font-size:11px; color:var(--text-faint); text-transform:uppercase; letter-spacing:.06em; margin:20px 8px 8px; }
  .hist { padding:9px 12px; border-radius:8px; font-size:13px; color:var(--text-dim); cursor:pointer; white-space:nowrap; display:flex; align-items:center; justify-content:space-between; position:relative; }
  .hist:hover { background: var(--card); }
  .hist.on { background: var(--card); color: var(--text); }
  .hist-title { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; flex:1; }
  .hist-more { opacity:0; width:22px; height:22px; border-radius:6px; border:none; background:none; color:var(--text-faint); cursor:pointer; font-size:16px; line-height:1; flex-shrink:0; letter-spacing:1px; }
  .hist:hover .hist-more { opacity:1; }
  .hist-more:hover { background:rgba(255,255,255,.08); color:var(--text); }
  .hist-menu { display:none; position:absolute; right:0; top:100%; background:var(--menu); border:1px solid var(--border); border-radius:10px; padding:4px; z-index:50; min-width:100px; box-shadow:0 6px 16px rgba(0,0,0,.35); }
  .hist-menu.open { display:block; }
  .hist-menu button { display:block; width:100%; text-align:left; padding:7px 10px; border:none; background:none; border-radius:6px; color:var(--text-dim); font-size:13px; cursor:pointer; font:inherit; }
  .hist-menu button:hover { background:rgba(255,255,255,.06); color:var(--warn); }
  /* 账户区 */
  .account-area { margin-top:auto; border-top:1px solid var(--border); position:relative; }
  .account-trigger { display:flex; align-items:center; gap:10px; width:100%; padding:10px 8px; border:none; background:none; cursor:pointer; border-radius:10px; font:inherit; color:inherit; transition:.15s; }
  .account-trigger:hover { background:var(--card); }
  .account-avatar { width:28px; height:28px; border-radius:8px; background:#2a2826; color:var(--text-dim); display:flex; align-items:center; justify-content:center; flex-shrink:0; }
  .account-avatar svg { width:16px; height:16px; }
  .account-info { text-align:left; overflow:hidden; }
  .account-email { font-size:12px; color:var(--text-dim); display:block; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
  .account-plan { font-size:11px; color:var(--text-faint); }
  .account-plan .plan-badge { color:var(--accent); }
  .account-plan .bal-low { color:var(--accent); font-weight:600; }
  /* 弹窗 */
  .account-popover { position:absolute; bottom:100%; left:8px; right:8px; background:var(--menu); border:1px solid var(--border); border-radius:12px; padding:12px; margin-bottom:6px; z-index:100; box-shadow:0 8px 24px rgba(0,0,0,.4); }
  .popover-row { display:flex; justify-content:space-between; align-items:center; padding:6px 0; font-size:13px; color:var(--text-dim); }
  .popover-row b { color:var(--text); font-size:13px; }
  .account-popover hr { border:none; border-top:1px solid var(--border); margin:8px 0; }
  .popover-link { display:block; width:100%; text-align:left; padding:8px 0; font-size:13px; color:var(--text-dim); background:none; border:none; cursor:pointer; border-radius:6px; font:inherit; text-decoration:none; }
  .popover-link:hover { color:var(--text); }

  /* 主区 */
  .main { display:flex; flex-direction:column; height:100vh; position:relative; }
  .topbar { height:32px; border-bottom:1px solid var(--border); }
  .topbar .title { font-weight:700; font-size:15px; }
  .topbar .sub { font-size:12px; color:var(--text-faint); }

  .chat {
    flex:1; overflow-y:auto; overflow-x:hidden; padding: 28px 0; position:relative;
    background-image: radial-gradient(rgba(255,255,255,.04) 1px, transparent 1.3px);
    background-size: 5px 5px;
  }
  .chat-inner { max-width: 760px; margin: 0 auto; padding: 0 22px; position:relative; z-index:1; }

  /* 空状态 */
  .welcome { text-align:center; padding: 60px 20px 40px; }
  .welcome h1 { font-size: clamp(24px,4vw,34px); font-weight:850; letter-spacing:-.02em; margin-bottom:10px; }
  .welcome h1 .g { background:var(--grad); -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent; }
  .welcome p { color:var(--text-dim); font-size:15px; max-width:480px; margin:0 auto; }
  .examples { display:flex; gap:10px; justify-content:center; flex-wrap:wrap; margin-top:24px; }
  .ex { padding:10px 16px; border:1px solid var(--border); border-radius:999px; font-size:13px; color:var(--text-dim); cursor:pointer; transition:.15s; }
  .ex:hover { border-color:var(--teal); color:var(--text); background:var(--grad-soft); }

  /* 消息气泡 */
  .msg { display:flex; gap:12px; margin: 18px 0; animation: rise .35s ease; }
  @keyframes rise { from{opacity:0; transform:translateY(8px)} to{opacity:1; transform:none} }
  .msg .avatar { width:30px; height:30px; border-radius:8px; flex-shrink:0; display:flex; align-items:center; justify-content:center; font-size:15px; }
  .msg.user { flex-direction: row-reverse; }
  .msg.user .avatar { display: none; }
  .msg.agent .avatar { display: none; }
  .bubble { max-width: 600px; padding: 13px 16px; border-radius: 14px; font-size:14px; line-height:1.65; }
  .msg.user .bubble { background: var(--grad-soft); border:1px solid rgba(255,255,255,.08); border-top-right-radius:4px; }
  .msg.agent .bubble { background: transparent; border: none; padding: 4px 0 10px; max-width: 100%; }
  .msg.agent { margin: 8px 0; }
    .bubble img.uimg { max-width:160px; border-radius:8px; display:block; margin-bottom:8px; }

  /* typing 指示 */
  .typing { display:inline-flex; gap:4px; align-items:center; }
  .typing span { width:6px; height:6px; border-radius:50%; background:var(--text-faint); animation: blink 1.2s infinite; }
  .typing span:nth-child(2){animation-delay:.2s} .typing span:nth-child(3){animation-delay:.4s}
  @keyframes blink { 0%,60%,100%{opacity:.3} 30%{opacity:1} }

  /* 双文案分区 — 口播 vs 发布文案，两个不同用途，不混在一起 */
  .copy-block { margin: 14px 0; }
  .copy-block:first-child { margin-top: 0; }
  .copy-label { font-size:12px; color:var(--text-faint); display:flex; align-items:center; gap:6px; margin-bottom:6px; font-weight:600; }
  .copy-body { font-size:14px; line-height:1.7; white-space:pre-wrap; }

  /* 节点步骤列表 — 多节点任务流的进度感：固定图标 + 连接线 + 文案变"已完成" */
  .steps { display:flex; flex-direction:column; padding:2px 0; }
  .step-group { position:relative; }
  .step-group:not(:last-child)::before {
    content:''; position:absolute; left:9px; top:15px; bottom:-15px; width:1px; background:var(--border);
  }
  .step-row { font-size:13px; color:var(--text); display:flex; align-items:center; gap:10px; padding:5px 0; opacity:.45; transition:opacity .25s; }
  .step-row.is-pending { opacity:.85; }
  .step-row.is-done { opacity:.55; }
  .step-row.is-warn { opacity:1; color:var(--warn); }
  .step-icon { width:20px; height:20px; border-radius:6px; border:1px solid var(--border); display:flex; align-items:center; justify-content:center; flex-shrink:0; color:var(--text-dim); position:relative; z-index:1; background:var(--card-hover); }
  .step-row.is-pending .step-icon, .step-row.is-warn .step-icon { border-color:var(--text-dim); color:var(--text); }
  .step-row .spinner { width:12px; height:12px; border-width:1.5px; }
  .step-summary { color:var(--text-faint); font-size:12px; margin-left:2px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; max-width:340px; }
  .step-output { margin: 2px 0 14px 30px; opacity:1; }
  .copy-btn { background:transparent; border:none; color:var(--text-faint); cursor:pointer; padding:2px; margin-left:auto; display:inline-flex; border-radius:4px; transition:.15s; }
  .copy-btn:hover { color:var(--text); background:var(--card-hover); }

  .gen-confirm{ margin-top:12px; }
  .video-out{ border-radius:12px; overflow:hidden; border:1px solid var(--border); max-width:300px; margin-top:6px; cursor:pointer; }
  .video-out video{ width:100%; display:block; }
  .video-out:hover{ border-color:var(--text-dim); }

  /* 图片卡片：可点击放大 + 下载 */
  .media-card{ position:relative; display:inline-block; max-width:200px; border-radius:10px; overflow:hidden; border:1px solid var(--border); cursor:pointer; margin-top:6px; }
  .media-card img{ display:block; width:100%; }
  .media-card:hover{ border-color:var(--text-dim); }
  .media-card .media-dl{ position:absolute; top:6px; right:6px; width:28px; height:28px; border-radius:6px; background:rgba(0,0,0,.55); backdrop-filter:blur(4px); border:none; color:#fff; cursor:pointer; display:flex; align-items:center; justify-content:center; opacity:0; transition:opacity .2s; }
  .media-card:hover .media-dl{ opacity:1; }
  .media-card .media-dl:hover{ background:rgba(0,0,0,.75); }

  /* 灯箱 */
  .lightbox{ position:fixed; inset:0; z-index:999; background:rgba(0,0,0,.88); display:flex; align-items:center; justify-content:center; cursor:pointer; animation:lbIn .15s ease; }
  @keyframes lbIn{ from{opacity:0} to{opacity:1} }
  .lightbox img, .lightbox video{ max-width:92vw; max-height:92vh; border-radius:10px; box-shadow:0 20px 60px rgba(0,0,0,.5); }
  .lightbox .lb-close{ position:absolute; top:16px; right:20px; width:36px; height:36px; border-radius:50%; background:rgba(255,255,255,.12); border:none; color:#fff; font-size:18px; cursor:pointer; display:flex; align-items:center; justify-content:center; }
  .lightbox .lb-close:hover{ background:rgba(255,255,255,.25); }
  .spinner{ width:16px; height:16px; border:2px solid var(--border); border-top-color:var(--teal); border-radius:50%; animation:spin 1s linear infinite; display:inline-block; vertical-align:middle; }
  @keyframes spin{ to{transform:rotate(360deg)} }
  .paywall{ background:var(--grad-soft); border:1px solid var(--teal); border-radius:12px; padding:16px; margin-top:8px; }
  .retry-card{ border-color: var(--warn); }

  /* 底部输入 dock — Creatify 风格 */
  .dock { border-top:1px solid var(--border); padding:16px 22px 20px; background:var(--bg); }
  .dock-inner{ max-width:720px; margin:0 auto; }
  .composer{ display:flex; flex-direction:column; gap:10px; border:1px solid var(--border); border-radius:16px; background:var(--card); padding:12px 14px; transition:.15s; }
  .composer:focus-within{ border-color:var(--teal); }
  .composer textarea{ width:100%; border:none; background:transparent; color:var(--text); font-family:inherit; font-size:15px; line-height:1.6; resize:none; outline:none; max-height:120px; padding:2px 0; }
  .composer textarea::placeholder{ color:var(--text-faint); font-size:14px; }
  .composer-row{ display:flex; align-items:center; justify-content:space-between; gap:8px; }
  .composer-row-left{ display:flex; align-items:center; gap:10px; }
  .composer-row-right{ display:flex; align-items:center; gap:8px; }
  .composer-divider{ width:1px; height:20px; background:var(--border); flex-shrink:0; }
  .composer .plus{ width:34px; height:34px; border-radius:8px; border:1px solid var(--border); background:transparent; cursor:pointer; color:var(--text-dim); font-size:14px; font-weight:600; display:flex; align-items:center; justify-content:center; transition:.15s; flex-shrink:0; }
  .composer .plus:hover{ border-color:var(--text-dim); color:var(--text); background:var(--card-hover); }
  .composer .plus.has{ border-color:var(--text-dim); color:var(--text); background:var(--card-hover); }
  .dropdown{ position:relative; }
  .dropdown-trigger{ display:flex; align-items:center; gap:6px; background:transparent; border:none; color:var(--text-dim); font-size:13px; padding:6px 4px; font-family:inherit; cursor:pointer; border-radius:6px; transition:.15s; }
  .dropdown-trigger:hover{ color:var(--text); }
  .dropdown-trigger svg{ flex-shrink:0; opacity:.6; transition:transform .15s; }
  .dropdown.open .dropdown-trigger svg{ transform:rotate(180deg); }
  .dropdown-menu{ position:absolute; left:0; bottom:calc(100% + 10px); min-width:148px; background:var(--menu); border:1px solid var(--border); border-radius:12px; padding:6px; box-shadow:0 12px 32px rgba(0,0,0,.5); display:none; flex-direction:column; gap:1px; z-index:30; }
  .dropdown.open .dropdown-menu{ display:flex; }
  .dropdown-item{ display:flex; align-items:center; justify-content:space-between; gap:10px; width:100%; background:transparent; border:none; border-radius:8px; padding:9px 10px; font-size:14px; font-family:inherit; color:var(--text); cursor:pointer; text-align:left; transition:.12s; }
  .dropdown-item:hover{ background:var(--card-hover); }
  .dropdown-item .check{ opacity:0; color:var(--text); flex-shrink:0; }
  .dropdown-item.is-selected .check{ opacity:1; }
  .dropdown-item.is-selected{ color:var(--ink, var(--text)); font-weight:600; }
  .send{ height:34px; padding:0 18px; border-radius:999px; border:none; background:var(--grad); color:var(--on-primary); font-weight:700; font-size:14px; cursor:pointer; display:flex; align-items:center; gap:6px; transition:.15s; flex-shrink:0; }
  .send:hover{ transform:translateY(-1px); }
  .send.is-stop{ background:transparent; border:1px solid rgba(255,120,100,.4); color:var(--warn); }
  .send.is-stop:hover{ background:rgba(255,120,100,.1); transform:none; }
  .thumb{ display:inline-flex; align-items:center; gap:8px; background:var(--bg-soft); border:1px solid var(--border); border-radius:9px; padding:5px 10px 5px 6px; font-size:12px; color:var(--text-dim); margin-bottom:6px; }
  .thumb img{ width:30px; height:30px; border-radius:6px; object-fit:cover; }
  .thumb .x{ cursor:pointer; color:var(--text-faint); }
  .hint{ font-size:11px; color:var(--text-faint); margin-top:8px; padding-left:4px; }
  /* 滚到底部按钮 —— sticky 悬浮在聊天区底部，不随内容滚动 */
  .scroll-bottom {
    position: sticky; bottom: 8px;
    margin: 0 auto;
    width: 36px; height: 36px; border-radius: 50%;
    border: 1px solid var(--border); background: var(--card);
    color: var(--text-dim); cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden; transition: opacity .2s, visibility .2s;
    z-index: 10;
    box-shadow: 0 2px 12px rgba(0,0,0,.4);
  }
  .scroll-bottom:hover { border-color: var(--text-dim); color: var(--text); background: var(--card-hover); }
  .scroll-bottom.is-visible { opacity: 1; visibility: visible; }

  /* ── 付费弹窗（v2 暗底 + 锈橙）── */
  .gv-modal-overlay {
    position: fixed; inset: 0; z-index: 200;
    display: flex; align-items: center; justify-content: center; padding: 20px;
    background: rgba(0,0,0,.6); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px);
    opacity: 0; transition: opacity .2s;
  }
  .gv-modal-overlay.show { opacity: 1; }
  .gv-modal {
    position: relative; width: 100%; max-width: 560px;
    background: var(--card); border: 1px solid var(--border); border-radius: 24px;
    padding: 36px 32px 28px;
    transform: translateY(8px) scale(.98); transition: transform .2s;
  }
  .gv-modal-overlay.show .gv-modal { transform: translateY(0) scale(1); }
  .gv-modal-close {
    position: absolute; top: 16px; right: 16px;
    width: 32px; height: 32px; border-radius: 50%;
    border: 1px solid var(--border); background: none; color: var(--text-dim);
    cursor: pointer; display: flex; align-items: center; justify-content: center; transition: .15s;
  }
  .gv-modal-close:hover { color: var(--text); border-color: var(--text-dim); }
  .gv-modal-head { margin-bottom: 24px; }
  .gv-modal-head h3 { font-size: 22px; font-weight: 800; letter-spacing: -.02em; color: var(--text); margin: 0 0 8px; }
  .gv-modal-head p { font-size: 14px; color: var(--text-dim); margin: 0; }
  .gv-plans { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
  .gv-plan { padding: 22px 20px; border: 1px solid var(--border); border-radius: 16px; }
  .gv-plan-featured { border-color: rgba(209,78,34,.4); background: var(--accent-soft); }
  .gv-plan-name { font-size: 13px; color: var(--text-dim); font-weight: 600; display: flex; align-items: center; gap: 7px; margin-bottom: 12px; }
  .gv-badge { font-size: 10px; font-weight: 700; color: #fff; background: var(--accent); padding: 2px 8px; border-radius: 99px; }
  .gv-plan-price { font-size: 34px; font-weight: 800; letter-spacing: -.02em; color: var(--text); line-height: 1; margin-bottom: 6px; }
  .gv-plan-price span { font-size: 14px; font-weight: 500; color: var(--text-dim); margin-left: 2px; }
  .gv-plan-sub { font-size: 12px; color: var(--text-faint); margin-bottom: 18px; }
  .gv-plan-btn { width: 100%; justify-content: center; text-decoration: none; }
  .gv-modal-foot { text-align: center; font-size: 12px; color: var(--text-faint); margin: 18px 0 0; }
  @media (max-width: 520px){ .gv-plans { grid-template-columns: 1fr; } .gv-modal { padding: 30px 22px 22px; } }

  /* 媒体查询放最后，确保覆盖上面的 .sidebar{display:flex} */
  @media (max-width: 820px){ .app{grid-template-columns:1fr} .sidebar{display:none} }