:root{
  --internal-bg:#f4f7fb;
  --internal-panel:#ffffff;
  --internal-text:#162033;
  --internal-muted:#66758a;
  --internal-line:#d8e0ea;
  --internal-primary:#155eef;
  --internal-primary-dark:#0f49c9;
  --internal-accent:#16a34a;
  --internal-warn:#f59e0b;
  --internal-shadow:0 20px 60px rgba(18,35,67,.10);
}
*{box-sizing:border-box}
body.internal-body{margin:0;font-family:"PingFang SC","Microsoft YaHei",sans-serif;background:
linear-gradient(180deg,#eef4ff 0%,#f4f7fb 180px,#f4f7fb 100%);color:var(--internal-text)}
.internal-shell{min-height:100vh}
.internal-header{padding:28px 24px 12px}
.internal-header .inner{max-width:1180px;margin:0 auto;background:linear-gradient(135deg,#0f1f3d 0%,#194d92 100%);color:#fff;border-radius:24px;padding:28px 32px;box-shadow:var(--internal-shadow)}
.btn-back-home{background:#eaf1ff;color:var(--internal-primary);border:1px solid #c7d7fb}
.btn-back-home:hover{background:#dbeafe}
.internal-header h1{margin:0 0 10px;font-size:2rem}
.internal-header p{margin:0;color:rgba(255,255,255,.78);line-height:1.7}
.internal-header .meta{margin-top:14px;display:flex;gap:10px;flex-wrap:wrap}
.internal-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:999px;background:rgba(255,255,255,.14);font-size:.85rem}
.internal-main{max-width:1180px;margin:0 auto;padding:0 24px 56px}
.internal-login{max-width:440px;margin:-48px auto 0;background:var(--internal-panel);border:1px solid var(--internal-line);border-radius:22px;padding:28px;box-shadow:var(--internal-shadow)}
.internal-login h2{margin:0 0 8px;font-size:1.45rem}
.internal-login p{margin:0 0 20px;color:var(--internal-muted);line-height:1.65}
.form-row{display:flex;gap:12px;flex-wrap:wrap}
.form-field{margin-bottom:14px}
.form-field label{display:block;font-size:.92rem;font-weight:600;margin-bottom:8px}
.form-field input,.kb-toolbar input,.kb-toolbar textarea,.kb-toolbar select{width:100%;padding:12px 14px;border:1px solid var(--internal-line);border-radius:14px;background:#fff;color:var(--internal-text);font-size:1rem}
.form-field input:focus,.kb-toolbar input:focus,.kb-toolbar textarea:focus,.kb-toolbar select:focus{outline:none;border-color:var(--internal-primary);box-shadow:0 0 0 4px rgba(21,94,239,.12)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:14px;padding:12px 18px;font-size:.96rem;font-weight:700;cursor:pointer;text-decoration:none;transition:.2s}
.btn-primary{background:var(--internal-primary);color:#fff}
.btn-primary:hover{background:var(--internal-primary-dark)}
.btn-secondary{background:#eaf1ff;color:var(--internal-primary)}
.btn-ghost{background:#fff;color:var(--internal-text);border:1px solid var(--internal-line)}
.login-error,.kb-error{min-height:20px;color:#dc2626;font-size:.92rem;margin-top:8px}
.internal-apps{display:none;padding-top:28px}
.section-heading{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:18px}
.section-heading h2{margin:0;font-size:1.6rem}
.section-heading p{margin:6px 0 0;color:var(--internal-muted)}
.app-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.app-card{background:var(--internal-panel);border:1px solid var(--internal-line);border-radius:22px;padding:22px;box-shadow:var(--internal-shadow);display:flex;flex-direction:column;gap:14px}
.app-card.coming-soon{opacity:.84}
.app-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.app-icon{width:52px;height:52px;border-radius:16px;background:linear-gradient(135deg,#dbeafe,#eff6ff);display:flex;align-items:center;justify-content:center;color:var(--internal-primary);font-size:1.35rem}
.app-status{display:inline-flex;padding:5px 10px;border-radius:999px;font-size:.8rem;font-weight:700}
.app-status.live{background:#dcfce7;color:#166534}
.app-status.plan{background:#fef3c7;color:#92400e}
.app-card h3{margin:0;font-size:1.25rem}
.app-card p{margin:0;color:var(--internal-muted);line-height:1.7}
.app-features{margin:0;padding:0;list-style:none;display:grid;gap:8px}
.app-features li{color:#344256;font-size:.95rem}
.app-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:auto}
.internal-topbar{display:none;align-items:center;justify-content:space-between;gap:12px;padding:22px 0 8px}
.internal-topbar-left{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.internal-user{color:var(--internal-muted);font-size:.95rem}
.kb-layout{display:grid;grid-template-columns:minmax(0,1.8fr) minmax(320px,1fr);gap:18px;padding-top:24px}
.kb-panel{background:var(--internal-panel);border:1px solid var(--internal-line);border-radius:22px;box-shadow:var(--internal-shadow)}
.kb-panel .hd{padding:20px 22px 0}
.kb-panel .bd{padding:20px 22px 22px}
.kb-panel h2,.kb-panel h3{margin:0}
.kb-sub{margin:10px 0 0;color:var(--internal-muted);line-height:1.65}
.kb-toolbar{display:grid;gap:12px}
.kb-toolbar .inline{display:grid;grid-template-columns:1fr 160px 140px;gap:12px}
.kb-toolbar textarea{min-height:120px;resize:vertical}
.kb-chat{display:grid;gap:14px}
.kb-answer{background:#f7fafc;border:1px solid #e6edf6;border-radius:18px;padding:16px;min-height:180px;line-height:1.8;white-space:pre-wrap}
.kb-answer.empty{color:var(--internal-muted)}
.kb-sources{display:grid;gap:12px}
.source-card{border:1px solid var(--internal-line);border-radius:16px;padding:14px;background:#fff}
.source-card h4{margin:0 0 6px;font-size:1rem}
.source-meta{font-size:.84rem;color:var(--internal-muted);margin-bottom:8px}
.source-snippet{font-size:.93rem;color:#344256;line-height:1.7}
.kb-loading{display:none;color:var(--internal-primary);font-weight:700}
.kb-note{color:var(--internal-muted);font-size:.9rem}
.hidden{display:none!important}
@media (max-width: 960px){
  .app-grid,.kb-layout{grid-template-columns:1fr}
  .kb-toolbar .inline{grid-template-columns:1fr}
}
@media (max-width: 640px){
  .internal-header,.internal-main{padding-left:16px;padding-right:16px}
  .internal-header .inner,.internal-login,.app-card,.kb-panel{padding-left:18px;padding-right:18px}
  .internal-header h1{font-size:1.6rem}
  .internal-topbar{align-items:flex-start}
  .internal-topbar-left{align-items:flex-start}
  .btn-back-home{padding:10px 14px;font-size:.9rem}
}

/* ===== KB Chat Sidebar Layout ===== */
.kb-chat-layout{flex:1;min-height:0;display:flex;overflow:hidden}
.kb-chat-main{flex:1;min-width:0;display:flex;flex-direction:column;overflow:hidden}

/* Sidebar panel */
.kb-sidebar{
  width:260px;flex-shrink:0;
  background:#111827;
  display:flex;flex-direction:column;overflow:hidden;
  border-right:1px solid rgba(255,255,255,.07);
  transition:width .22s cubic-bezier(.4,0,.2,1);
}
.kb-sidebar.is-collapsed{width:0}

.kb-sidebar__header{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 12px 8px;gap:6px;flex-shrink:0;
}
.kb-sidebar__title{
  font-size:.78rem;font-weight:600;color:#94a3b8;
  letter-spacing:.04em;text-transform:uppercase;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  display:flex;align-items:center;gap:6px;
}
.kb-sidebar__actions{display:flex;gap:3px;flex-shrink:0}
.kb-sidebar__icon-btn{
  width:26px;height:26px;background:none;border:none;border-radius:6px;
  color:#64748b;cursor:pointer;
  display:flex;align-items:center;justify-content:center;font-size:.78rem;
  transition:background .15s,color .15s;
}
.kb-sidebar__icon-btn:hover{background:rgba(255,255,255,.09);color:#cbd5e1}

.kb-sidebar__status{
  font-size:.72rem;color:#4b5563;padding:0 14px 8px;flex-shrink:0;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.kb-sidebar__status.is-empty{color:#374151}

.kb-sidebar__list{flex:1;overflow-y:auto;padding:0 7px 12px}
.kb-sidebar__list::-webkit-scrollbar{width:3px}
.kb-sidebar__list::-webkit-scrollbar-track{background:transparent}
.kb-sidebar__list::-webkit-scrollbar-thumb{background:#1e293b;border-radius:2px}

/* Individual history entry */
.kb-sidebar-item{
  display:block;width:100%;background:none;border:none;border-radius:8px;
  padding:8px 10px;text-align:left;cursor:pointer;
  color:#cbd5e1;font-family:inherit;font-size:.81rem;line-height:1.45;
  transition:background .12s;margin-bottom:2px;
}
.kb-sidebar-item:hover{background:rgba(255,255,255,.08)}
.kb-sidebar-item__text{
  display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.kb-sidebar-item__date{
  display:block;font-size:.69rem;color:#4b5563;margin-top:2px;
}

/* Topbar expand button (shows when sidebar is collapsed) */
.kb-sidebar-expand-btn{
  display:none;width:36px!important;height:36px;
  padding:0!important;justify-content:center;align-items:center;
}

@media(max-width:768px){
  .kb-sidebar{
    position:absolute;left:0;top:0;bottom:0;z-index:100;
    box-shadow:4px 0 20px rgba(0,0,0,.35);
  }
  .kb-chat-layout{position:relative}
}

/* ===== KB Chat Page (shared by internal/safety|business|quality|xj-manual) ===== */
/* Viewport-lock only applies to the chat app-shell pages (body.kb-chat-view),
   not the scrollable internal portal index which also uses body.internal-body. */
html:has(body.kb-chat-view), body.kb-chat-view {
    height: 100%;
    overflow: hidden;
}
body.kb-chat-view {
    display: flex;
    flex-direction: column;
}
.site-nav { flex-shrink: 0; }
/* Chat page container */
.kb-chat-page {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    background: var(--internal-bg, #f4f7fb);
}
.kb-chat-subheader {
    background: linear-gradient(135deg, #0f1f3d 0%, #194d92 100%);
    color: #fff;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}
.kb-chat-subheader h1 {
    font-size: 1.05rem;
    margin: 0;
    font-weight: 700;
}
.kb-chat-subheader p {
    margin: 2px 0 0;
    font-size: 0.78rem;
    color: rgba(255,255,255,0.68);
}
.kb-chat-topbar {
    background: #fff;
    border-bottom: 1px solid var(--internal-line, #d8e0ea);
    padding: 9px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-shrink: 0;
}
/* Centered content column */
.kb-chat-body {
    flex: 1;
    min-height: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    max-width: 860px;
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}
/* Scrollable history */
.kb-chat-history {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    padding: 24px 0 12px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    scroll-behavior: smooth;
}
/* Message layout */
.kb-msg {
    display: flex;
    flex-direction: column;
    gap: 4px;
    animation: kb-msg-in 0.18s ease;
}
@keyframes kb-msg-in {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}
.kb-msg--user { align-items: flex-end; }
.kb-msg--ai   { align-items: flex-start; }
.kb-msg__label {
    font-size: 0.72rem;
    color: var(--internal-muted, #66758a);
    padding: 0 4px;
}
.kb-msg__bubble {
    max-width: 82%;
    border-radius: 16px;
    padding: 13px 18px;
    line-height: 1.75;
    font-size: 0.93rem;
}
.kb-msg--user .kb-msg__bubble {
    background: var(--internal-primary, #155eef);
    color: #fff;
    border-bottom-right-radius: 4px;
}
.kb-msg--ai .kb-msg__bubble {
    background: #fff;
    border: 1px solid var(--internal-line, #d8e0ea);
    color: var(--internal-text, #162033);
    border-bottom-left-radius: 4px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
/* Rendered markdown */
.kb-msg__md h1,.kb-msg__md h2,.kb-msg__md h3,.kb-msg__md h4 {
    margin: 14px 0 6px; font-weight: 700; line-height: 1.3;
}
.kb-msg__md h1{font-size:1.15rem}
.kb-msg__md h2{font-size:1.05rem}
.kb-msg__md h3,.kb-msg__md h4{font-size:0.97rem}
.kb-msg__md p{margin:6px 0}
.kb-msg__md ul,.kb-msg__md ol{padding-left:22px;margin:6px 0}
.kb-msg__md li{margin:3px 0}
.kb-msg__md strong{font-weight:700}
.kb-msg__md em{font-style:italic}
.kb-msg__md table{
    border-collapse:collapse;width:100%;margin:10px 0;font-size:0.87rem;
}
.kb-msg__md th,.kb-msg__md td{
    border:1px solid #d8e0ea;padding:7px 11px;text-align:left;
}
.kb-msg__md th{background:#eef4ff;font-weight:700}
.kb-msg__md tr:nth-child(even) td{background:#f8fafc}
.kb-msg__md code{
    background:#f1f5f9;padding:2px 5px;border-radius:4px;
    font-size:0.86em;font-family:monospace;
}
.kb-msg__md blockquote{
    border-left:3px solid #94a3b8;margin:8px 0;
    padding:6px 14px;color:#64748b;
    background:#f8fafc;border-radius:0 6px 6px 0;
}
.kb-msg__md hr{border:none;border-top:1px solid #e2e8f0;margin:12px 0}
/* Sources toggle */
.kb-sources-toggle {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin-top: 10px;
    border: none;
    background: none;
    color: var(--internal-primary, #155eef);
    font-size: 0.8rem;
    cursor: pointer;
    padding: 3px 0;
    font-family: inherit;
}
.kb-sources-toggle:hover { text-decoration: underline; }
.kb-bubble-sources {
    margin-top: 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.kb-bubble-sources.hidden { display: none; }
.kb-src-card {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 0.82rem;
}
.kb-src-card__title { font-weight: 700; color: #334155; margin-bottom: 3px; }
.kb-src-card__meta  { color: #64748b; font-size: 0.76rem; margin-bottom: 5px; }
.kb-src-card__text  { color: #475569; line-height: 1.55; }
/* Typing dots */
.kb-typing {
    display: flex; gap: 5px; align-items: center;
    padding: 14px 18px;
    background: #fff;
    border: 1px solid var(--internal-line, #d8e0ea);
    border-radius: 16px; border-bottom-left-radius: 4px;
    width: fit-content;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.kb-typing span {
    width: 8px; height: 8px; background: #94a3b8;
    border-radius: 50%; animation: kb-bounce 1.2s infinite;
}
.kb-typing span:nth-child(2){animation-delay:.2s}
.kb-typing span:nth-child(3){animation-delay:.4s}
@keyframes kb-bounce {
    0%,60%,100%{transform:translateY(0)} 30%{transform:translateY(-6px)}
}
/* Welcome screen */
.kb-welcome {
    display: flex; flex-direction: column; align-items: center;
    padding: 36px 16px 20px; text-align: center;
    color: var(--internal-muted, #66758a);
}
.kb-welcome__icon {
    width: 60px; height: 60px; border-radius: 18px;
    background: linear-gradient(135deg, #dbeafe, #eff6ff);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; color: var(--internal-primary, #155eef);
    margin-bottom: 14px;
}
.kb-welcome h3{margin:0 0 8px;color:var(--internal-text,#162033);font-size:1.2rem}
.kb-welcome p{margin:0 0 18px;font-size:0.87rem;line-height:1.65;max-width:480px}
.kb-chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.kb-chip {
    font-size: 0.82rem; padding: 7px 14px;
    border: 1px solid var(--internal-line, #d8e0ea);
    border-radius: 20px; cursor: pointer;
    background: #fff; color: var(--internal-text, #162033);
    transition: all .15s; font-family: inherit;
}
.kb-chip:hover {
    border-color: var(--internal-primary, #155eef);
    color: var(--internal-primary, #155eef); background: #eff6ff;
}
/* Input bar */
.kb-chat-input-wrap {
    flex-shrink: 0;
    padding: 10px 0 16px;
}
.kb-chat-input-controls {
    display: flex; gap: 8px; margin-bottom: 8px;
    align-items: center; flex-wrap: wrap;
}
.kb-chat-input-controls label {
    font-size: 0.78rem; color: var(--internal-muted, #66758a);
}
.kb-chat-input-controls select {
    font-size: 0.81rem; padding: 5px 9px;
    border: 1px solid var(--internal-line, #d8e0ea);
    border-radius: 8px; background: #fff;
    color: var(--internal-text, #162033); font-family: inherit;
}
.kb-chat-input-row {
    display: flex; gap: 10px; align-items: stretch;
}
.kb-question-input {
    flex: 1; min-width: 0; resize: none;
    border: 1px solid var(--internal-line, #d8e0ea);
    border-radius: 14px; padding: 11px 16px;
    font-size: 0.95rem; line-height: 1.55;
    min-height: 46px; max-height: 160px;
    overflow-y: auto; font-family: inherit;
    background: #fff; color: var(--internal-text, #162033);
    transition: border-color .15s, box-shadow .15s;
}
.kb-question-input:focus {
    outline: none;
    border-color: var(--internal-primary, #155eef);
    box-shadow: 0 0 0 3px rgba(21,94,239,.1);
}
.kb-chat-send-btn {
    min-width: 88px; height: 46px; border-radius: 12px;
    border: none; background: var(--internal-primary, #155eef);
    color: #fff; font-size: 0.95rem; font-weight: 600; cursor: pointer;
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    flex-shrink: 0; padding: 0 16px; white-space: nowrap; transition: background .15s;
}
.kb-chat-send-btn:hover:not(:disabled) {
    background: var(--internal-primary-dark, #0f49c9);
}
.kb-chat-send-btn:disabled{background:#94a3b8;cursor:not-allowed}
.kb-history-btn {
    white-space: nowrap;
}
.kb-history-modal.hidden { display: none; }
.kb-history-modal {
    position: fixed;
    inset: 0;
    z-index: 1100;
}
.kb-history-modal__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(2px);
}
.kb-history-modal__dialog {
    position: relative;
    z-index: 1;
    width: min(880px, calc(100vw - 32px));
    max-height: min(760px, calc(100vh - 32px));
    margin: 16px auto;
    background: #fff;
    border-radius: 20px;
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.22);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.kb-history-modal__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    padding: 18px 20px 14px;
    border-bottom: 1px solid var(--internal-line, #d8e0ea);
}
.kb-history-modal__header h3 {
    margin: 0;
    font-size: 1.02rem;
    color: var(--internal-text, #162033);
}
.kb-history-modal__header p {
    margin: 6px 0 0;
    font-size: 0.82rem;
    color: var(--internal-muted, #66758a);
}
.kb-history-modal__close {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 10px;
    background: #eef4ff;
    color: var(--internal-primary, #155eef);
    cursor: pointer;
    flex-shrink: 0;
}
.kb-history-modal__body {
    padding: 16px 20px 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.kb-history-status {
    font-size: 0.82rem;
    color: var(--internal-muted, #66758a);
}
.kb-history-status.is-empty {
    padding: 28px 0;
    text-align: center;
}
.kb-history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.kb-history-card {
    border: 1px solid #d8e0ea;
    border-radius: 14px;
    background: #fff;
    overflow: hidden;
}
.kb-history-card summary {
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    cursor: pointer;
    padding: 14px 16px;
    background: #f8fafc;
}
.kb-history-card summary::-webkit-details-marker { display: none; }
.kb-history-card__summary {
    font-weight: 600;
    color: var(--internal-text, #162033);
}
.kb-history-card__time {
    color: var(--internal-muted, #66758a);
    font-size: 0.78rem;
    white-space: nowrap;
}
.kb-history-card__content {
    padding: 14px 16px 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.kb-history-card__question,
.kb-history-card__answer {
    font-size: 0.88rem;
    line-height: 1.7;
    color: var(--internal-text, #162033);
}
.kb-history-card__answer {
    padding: 12px 14px;
    border-radius: 12px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
}
.kb-history-card__actions {
    display: flex;
    justify-content: flex-end;
}
.kb-history-reuse-btn {
    border: 1px solid #bfdbfe;
    border-radius: 10px;
    background: #eff6ff;
    color: var(--internal-primary, #155eef);
    font-size: 0.82rem;
    font-weight: 600;
    padding: 8px 12px;
    cursor: pointer;
}
body.kb-modal-open {
    overflow: hidden;
}
.kb-chat-error{font-size:.82rem;color:#dc2626;min-height:18px;margin-top:4px}
.kb-chat-hint{font-size:.72rem;color:#94a3b8;margin-top:5px;text-align:center}
@media(max-width:640px){
    .kb-chat-subheader,.kb-chat-topbar{padding-left:14px;padding-right:14px}
    .kb-chat-body{padding:0 12px}
    .kb-msg__bubble{max-width:92%}
    .kb-chat-input-row { align-items: stretch; }
    .kb-chat-send-btn { min-width: 76px; }
    .kb-history-modal__dialog {
        width: calc(100vw - 16px);
        max-height: calc(100vh - 16px);
        margin: 8px auto;
    }
    .kb-history-modal__header,
    .kb-history-modal__body {
        padding-left: 14px;
        padding-right: 14px;
    }
    .kb-history-card summary {
        flex-direction: column;
        align-items: flex-start;
    }
}