:root {
  --zk-blue: #0f89d1;      /* 主站品牌蓝 rgb(15,137,209)，保持官网一致性 */
  --zk-blue-dark: #0b6ca8;
  --bg: #f5f6f8;
  --panel: #ffffff;
  --text: #1f2329;
  --muted: #8a8f99;
  --border: #e6e8eb;
  --henlin: #ff6a00;
  --radius: 12px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif; background: var(--bg); color: var(--text); }
.app { display: flex; height: 100vh; }

/* ---------- 侧边栏 ---------- */
.sidebar { width: 260px; background: var(--panel); border-right: 1px solid var(--border); display: flex; flex-direction: column; transition: margin .2s; }
.sidebar.hidden { margin-left: -260px; }
.brand { padding: 18px 16px 12px; border-bottom: 1px solid var(--border); }
.brand-name { font-weight: 700; font-size: 16px; margin-bottom: 12px; }
.brand-name span { color: var(--zk-blue); font-size: 13px; font-weight: 500; }
.new-chat { width: 100%; padding: 10px; border: 1px solid var(--zk-blue); color: var(--zk-blue); background: #fff; border-radius: 8px; cursor: pointer; font-size: 14px; }
.new-chat:hover { background: var(--zk-blue); color: #fff; }
.session-list { flex: 1; overflow-y: auto; padding: 8px; }
.session-item { padding: 10px 12px; border-radius: 8px; cursor: pointer; font-size: 13px; color: #444; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.session-item:hover { background: #f0f2f5; }
.session-item.active { background: #e8efff; color: var(--zk-blue-dark); }
.sidebar-foot { padding: 12px 16px; border-top: 1px solid var(--border); font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: #ccc; display: inline-block; }
.dot.ok { background: #22c55e; } .dot.bad { background: #ef4444; }

/* ---------- 主区 ---------- */
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar { height: 52px; background: var(--panel); border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 12px; padding: 0 16px; }
.menu-btn { border: none; background: none; font-size: 18px; cursor: pointer; color: var(--muted); }
.topbar-title { font-weight: 600; font-size: 15px; }
.topbar-note { margin-left: auto; font-size: 12px; color: var(--muted); }

.messages { flex: 1; overflow-y: auto; padding: 24px; }
.msg-wrap { max-width: 860px; margin: 0 auto 20px; }
.msg { display: flex; gap: 12px; }
.avatar { width: 34px; height: 34px; border-radius: 8px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; font-size: 15px; }
.msg.user .avatar { background: #e8efff; }
.msg.ai .avatar { background: var(--zk-blue); color: #fff; }
.bubble { min-width: 0; }
.msg.user .content { background: #e8efff; border-radius: 4px 14px 14px 14px; padding: 10px 14px; display: inline-block; white-space: pre-wrap; word-break: break-word; }
.msg.ai .content { padding: 2px 0; line-height: 1.75; font-size: 14.5px; word-break: break-word; }
.msg.ai .content table { border-collapse: collapse; margin: 10px 0; font-size: 13px; width: 100%; }
.msg.ai .content th, .msg.ai .content td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.msg.ai .content th { background: #f0f2f5; }
.msg.ai .content code { background: #f0f2f5; padding: 1px 5px; border-radius: 4px; font-size: 13px; color: var(--zk-blue-dark); }
.msg.ai .content pre code { background: none; padding: 0; color: inherit; }
.msg.ai .content pre { margin: 10px 0; }
.msg.ai .content blockquote { border-left: 3px solid var(--border); padding-left: 10px; color: var(--muted); margin: 8px 0; }
.msg.ai .content a { color: var(--zk-blue); }
.msg.ai .content ul, .msg.ai .content ol { padding-left: 22px; margin: 6px 0; }

.status { color: var(--muted); font-size: 13px; padding: 4px 0 4px 46px; }
.status::before { content: "⏳ "; }

.sources { margin: 10px 0 0 46px; font-size: 12.5px; color: var(--muted); }
.sources a { color: var(--zk-blue); margin-right: 12px; text-decoration: none; }
.sources a:hover { text-decoration: underline; }

/* ---------- 引导卡片 ---------- */
.card { margin: 12px 0 0 46px; max-width: 520px; border-radius: var(--radius); padding: 14px 16px; position: relative; border: 1px solid var(--border); background: #fff; }
.card.henlintek { border-color: #ffd9b8; background: linear-gradient(135deg, #fff7f0, #fff); }
.card.agent_line { border-color: #c7d8ff; background: linear-gradient(135deg, #f2f7ff, #fff); }
.card .card-title { font-weight: 700; font-size: 14px; margin-bottom: 6px; }
.card .card-body { font-size: 13px; color: #555; line-height: 1.6; margin-bottom: 10px; }
.card .card-cta { display: inline-block; background: var(--henlin); color: #fff !important; padding: 7px 14px; border-radius: 8px; font-size: 13px; text-decoration: none; }
.card.agent_line .card-cta { background: var(--zk-blue); }
.card .card-close { position: absolute; top: 8px; right: 10px; border: none; background: none; color: var(--muted); cursor: pointer; font-size: 14px; }

/* ---------- 欢迎页 ---------- */
.welcome { max-width: 860px; margin: 6vh auto 0; text-align: center; }
.welcome h1 { font-size: 26px; margin-bottom: 10px; }
.welcome p { color: var(--muted); margin-bottom: 28px; }
.quick-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.quick { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 14px; text-align: left; cursor: pointer; font-size: 13px; line-height: 1.5; }
.quick:hover { border-color: var(--zk-blue); box-shadow: 0 2px 10px rgba(26, 92, 255, .12); }
.quick b { display: block; font-size: 14.5px; margin: 4px 0 2px; }
.quick span { color: var(--muted); font-size: 12px; }

/* ---------- 输入区 ---------- */
.composer { background: var(--panel); border-top: 1px solid var(--border); padding: 12px 16px; display: flex; gap: 10px; align-items: flex-end; }
.composer textarea { flex: 1; resize: none; border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; font-size: 14.5px; font-family: inherit; max-height: 140px; outline: none; }
.composer textarea:focus { border-color: var(--zk-blue); }
#btnSend { width: 44px; height: 44px; border: none; border-radius: 10px; background: var(--zk-blue); color: #fff; font-size: 17px; cursor: pointer; }
#btnSend:disabled { background: #b9c7ee; cursor: not-allowed; }

@media (max-width: 820px) {
  .sidebar { position: fixed; z-index: 20; height: 100%; }
  .sidebar.hidden { margin-left: -270px; }
  .quick-grid { grid-template-columns: 1fr 1fr; }
  .topbar-note { display: none; }
}

/* ---------- 栏目条（豆包式） ---------- */
.modebar { background: var(--panel); border-top: 1px solid var(--border); padding: 8px 16px 0; display: flex; gap: 8px; overflow-x: auto; }
.mode { flex-shrink: 0; border: 1px solid var(--border); background: #fff; border-radius: 999px; padding: 6px 14px; font-size: 13px; color: #555; cursor: pointer; white-space: nowrap; margin-bottom: 8px; }
.mode:hover { border-color: var(--zk-blue); color: var(--zk-blue); }
.mode.active { background: var(--zk-blue); border-color: var(--zk-blue); color: #fff; }

/* ---------- 附件条 ---------- */
.attach-bar { background: var(--panel); padding: 6px 16px 0; display: flex; align-items: center; gap: 8px; }
.attach-chip { background: #eef3ff; color: var(--zk-blue-dark); border-radius: 8px; padding: 5px 12px; font-size: 12.5px; max-width: 70%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.attach-remove { border: none; background: none; color: var(--muted); cursor: pointer; font-size: 13px; }

/* ---------- 上传按钮 ---------- */
#btnUpload { width: 44px; height: 44px; border: 1px solid var(--border); border-radius: 10px; background: #fff; font-size: 17px; cursor: pointer; color: #666; }
#btnUpload:hover { border-color: var(--zk-blue); color: var(--zk-blue); }

/* ---------- 登录按钮与配额 ---------- */
.auth-btn { border: 1px solid var(--zk-blue); color: var(--zk-blue); background: #fff; border-radius: 999px; padding: 6px 16px; font-size: 13px; cursor: pointer; }
.auth-btn:hover { background: var(--zk-blue); color: #fff; }
.quota-badge { font-size: 12px; color: var(--muted); background: #f0f2f5; border-radius: 999px; padding: 4px 10px; }

/* ---------- 登录弹窗 ---------- */
.auth-modal { position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 9999; display: flex; align-items: center; justify-content: center; }
.auth-box { background: #fff; border-radius: 16px; padding: 28px 28px 22px; width: 360px; max-width: calc(100vw - 40px); position: relative; }
.auth-close { position: absolute; top: 12px; right: 14px; border: none; background: none; font-size: 16px; color: var(--muted); cursor: pointer; }
.auth-tabs { display: flex; gap: 16px; margin-bottom: 8px; }
.auth-tab { border: none; background: none; font-size: 16px; font-weight: 600; color: var(--muted); cursor: pointer; padding-bottom: 6px; border-bottom: 2px solid transparent; }
.auth-tab.active { color: var(--zk-blue); border-bottom-color: var(--zk-blue); }
.auth-tip { font-size: 12.5px; color: var(--muted); margin-bottom: 16px; }
.auth-input { width: 100%; border: 1px solid var(--border); border-radius: 10px; padding: 11px 12px; font-size: 14px; margin-bottom: 12px; outline: none; }
.auth-input:focus { border-color: var(--zk-blue); }
.auth-error { color: #ef4444; font-size: 12.5px; min-height: 18px; margin-bottom: 6px; }
.auth-submit { width: 100%; background: var(--zk-blue); color: #fff; border: none; border-radius: 10px; padding: 12px; font-size: 15px; cursor: pointer; }
.auth-note { text-align: center; font-size: 12px; color: var(--muted); margin-top: 14px; }

/* ---------- toast ---------- */
#toast { position: fixed; top: 70px; left: 50%; transform: translateX(-50%); background: rgba(30,34,40,.92); color: #fff; padding: 9px 18px; border-radius: 10px; font-size: 13px; z-index: 99999; opacity: 0; transition: opacity .25s; pointer-events: none; }
#toast.error { background: #c0392b; }

/* ---------- 后台管理页 ---------- */
.admin-body { background: var(--bg); min-height: 100vh; }
.admin-top { background: var(--panel); border-bottom: 1px solid var(--border); padding: 14px 24px; display: flex; align-items: center; gap: 16px; }
.admin-top h1 { font-size: 17px; }
.admin-top a { color: var(--zk-blue); font-size: 13px; text-decoration: none; }
.admin-tabs { display: flex; gap: 8px; padding: 14px 24px 0; }
.admin-tab { border: 1px solid var(--border); background: #fff; border-radius: 999px; padding: 7px 16px; font-size: 13px; cursor: pointer; }
.admin-tab.active { background: var(--zk-blue); color: #fff; border-color: var(--zk-blue); }
.admin-panel { padding: 20px 24px; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px; margin-bottom: 22px; }
.stat-card { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.stat-num { font-size: 26px; font-weight: 700; color: var(--zk-blue-dark); }
.stat-label { font-size: 12.5px; color: var(--muted); margin-top: 4px; }
.admin-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; font-size: 13px; }
.admin-table th, .admin-table td { border-bottom: 1px solid var(--border); padding: 9px 12px; text-align: left; }
.admin-table th { background: #f6f8fa; font-weight: 600; }
.admin-table tr:hover td { background: #fafbff; }
.btn-sm { border: 1px solid var(--border); background: #fff; border-radius: 6px; padding: 4px 10px; font-size: 12px; cursor: pointer; }
.btn-sm:hover { border-color: var(--zk-blue); color: var(--zk-blue); }
.btn-sm.danger:hover { border-color: #ef4444; color: #ef4444; }
.form-row { display: flex; gap: 10px; align-items: center; margin-bottom: 12px; flex-wrap: wrap; }
.form-row label { font-size: 13px; color: #555; width: 110px; }
.form-row input, .form-row select { border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; font-size: 13px; width: 300px; }
.admin-card { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 20px; max-width: 760px; }
.admin-card h3 { font-size: 15px; margin-bottom: 14px; }
.admin-note { font-size: 12px; color: var(--muted); margin-top: 10px; }

/* ---------- 文件夹 ---------- */
.folder-bar { padding: 8px 12px 0; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; border-bottom: 1px solid var(--border); padding-bottom: 8px; }
.folder-chip { font-size: 12px; color: #666; background: #f0f2f5; border-radius: 999px; padding: 4px 10px; cursor: pointer; user-select: none; }
.folder-chip:hover { background: #e2e9fa; }
.folder-chip.active { background: var(--zk-blue); color: #fff; }
.folder-add { border: 1px dashed #c3ccd9; background: none; color: var(--muted); border-radius: 999px; padding: 3px 10px; font-size: 12px; cursor: pointer; }
.folder-add:hover { color: var(--zk-blue); border-color: var(--zk-blue); }
.session-item { display: flex; align-items: center; justify-content: space-between; gap: 6px; }
.session-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.session-menu-btn { border: none; background: none; color: var(--muted); cursor: pointer; font-size: 15px; padding: 0 4px; opacity: 0; transition: opacity .15s; }
.session-item:hover .session-menu-btn { opacity: 1; }
.session-menu { position: fixed; z-index: 99999; background: #fff; border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 6px 24px rgba(0,0,0,.12); padding: 6px; min-width: 200px; }
.menu-item { padding: 8px 12px; font-size: 13px; color: #444; border-radius: 6px; cursor: pointer; }
.menu-item:hover { background: #f0f2f5; }
.menu-head { color: var(--muted); font-size: 12px; cursor: default; }
.menu-head:hover { background: none; }
.menu-danger { color: #ef4444; }

/* ---------- 验证码行 ---------- */
.code-row { display: flex; gap: 8px; }
.code-row .auth-input { flex: 1; }
.code-btn { flex-shrink: 0; border: 1px solid var(--zk-blue); color: var(--zk-blue); background: #fff; border-radius: 10px; padding: 0 14px; font-size: 13px; cursor: pointer; height: 42px; }
.code-btn:hover { background: var(--zk-blue); color: #fff; }

/* ---------- 可访问性（审计 A5） ---------- */
button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--zk-blue); outline-offset: 2px;
}
/* ---------- 侧栏品牌区（审计 B1） ---------- */
.brand-logo { height: 40px; width: auto; display: block; margin-bottom: 8px; }
/* ---------- embed 模式（隐藏侧栏，审计 C3） ---------- */
body.embed .sidebar { display: none; }
body.embed .menu-btn { display: none; }

/* ---------- 移动端适配增强（第 2 项） ---------- */
@media (max-width: 820px) {
  .messages { padding: 14px 12px; }
  .msg-wrap { margin-bottom: 16px; }
  .sources, .card { margin-left: 0; }
  .msg.ai .content { font-size: 14px; line-height: 1.7; }
  .msg.user .content { max-width: 86vw; }
  .composer { padding: 10px 12px calc(10px + env(safe-area-inset-bottom)); }
  .modebar { padding: 8px 12px 0; }
  .topbar { padding: 0 12px; gap: 8px; }
  .topbar-title { font-size: 14px; }
  .quota-badge { padding: 3px 8px; font-size: 11px; }
  .auth-btn { padding: 5px 12px; font-size: 12px; }
  .welcome { margin-top: 3vh; padding: 0 8px; }
  .welcome h1 { font-size: 21px; }
  .welcome .welcome-tag { font-size: 12.5px; }
  .quick-grid { grid-template-columns: 1fr; gap: 10px; }
  .quick { padding: 13px 14px; }
  .session-menu { max-width: 76vw; }
  .folder-bar { padding: 8px 12px; }
  .attach-bar { padding: 6px 12px 0; }
  #toast { top: 60px; max-width: 88vw; text-align: center; }
}
@media (max-width: 420px) {
  .msg.ai .content table { font-size: 12px; }
  .msg.ai .content th, .msg.ai .content td { padding: 5px 7px; }
  .brand-logo { height: 34px; }
}

/* ---------- P1-4 SVG 图标 ---------- */
.ico { width: 18px; height: 18px; color: var(--zk-blue); vertical-align: -3px; flex-shrink: 0; }
.quick .ico { width: 20px; height: 20px; display: block; margin-bottom: 2px; }
.mode .ico { width: 15px; height: 15px; margin-right: 4px; color: inherit; }

/* ---------- P2-2 顶栏 logo ---------- */
.topbar-logo { height: 22px; width: auto; display: none; }
@media (max-width: 820px) { .topbar-logo { display: block; } }

/* ---------- P2-3 侧栏品牌语 ---------- */
.sidebar-tag { padding: 10px 16px; font-size: 11px; color: #b8bec7; text-align: center; letter-spacing: .5px; }

/* ---------- P1-5 隐私告知 ---------- */
.privacy-note { background: var(--panel); border-top: 1px solid var(--border); padding: 5px 16px calc(5px + env(safe-area-inset-bottom)); font-size: 11px; color: var(--muted); text-align: center; }
.privacy-note a { color: var(--muted); }
.privacy-note a:hover { color: var(--zk-blue); }

/* ---------- P2-1 移动端场景卡紧凑 ---------- */
@media (max-width: 820px) {
  .quick { display: flex; align-items: center; gap: 10px; padding: 10px 14px; text-align: left; }
  .quick .ico { margin-bottom: 0; }
  .quick b { margin: 0; font-size: 14px; }
  .quick span { font-size: 12px; }
}

/* ---------- P3-2 来源角标点击面 ---------- */
.sources a { display: inline-block; padding: 4px 6px; margin-right: 4px; line-height: 1.4; }
.sources a:active { background: #eef3ff; border-radius: 6px; }

/* ---------- P3-4 恒领卡片关闭语义 ---------- */
.card .card-close { position: static; float: right; margin-top: -4px; font-size: 12px; color: var(--muted); padding: 4px 8px; border-radius: 6px; }
.card .card-close:hover { background: #f0f2f5; color: #666; }

/* ---------- 细节优化：移动端栏目条右侧渐隐提示可滑动 ---------- */
@media (max-width: 820px) {
  .modebar {
    -webkit-mask-image: linear-gradient(to right, #000 0, #000 88%, transparent 100%);
    mask-image: linear-gradient(to right, #000 0, #000 88%, transparent 100%);
  }
}