*{box-sizing:border-box;margin:0;padding:0}
:root{
  --brand:#465fff;--brand-hover:#3641f5;--brand-bg:rgba(70,95,255,.12);--brand-text:var(--brand);
  --bg:#f9fafb;--bg-card:#fff;--bg-sidebar:#fff;--border:#e4e7ec;--border-light:#e4e7ec;
  --text:#101828;--text-dim:#667085;
  --green:#12b76a;--red:#ef4444;--amber:#f59e0b;--sky:#0ba5ec;
  --radius:12px;
}
body.dark{
  --bg:#101828;--bg-card:#1f2937;--bg-sidebar:#0f172a;
  --border:#374151;--border-light:#374151;--text:rgba(255,255,255,.92);--text-dim:#98a2b3;
  --brand:#6d8dff;--brand-bg:rgba(109,141,255,.15);
}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--text);font-size:14px;line-height:1.5}
button{font-family:inherit}
body.dark .user-menu-item:hover{background:rgba(255,255,255,.05)}
body:not(.dark) .theme-sun{display:none}
body.dark .theme-moon{display:none}
input,textarea,select,button{font-family:inherit;font-size:14px}
.inp{width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:10px;background:var(--bg-card);color:var(--text);outline:none;font-size:14px}
.inp:focus{border-color:var(--brand)}
textarea.inp{resize:vertical}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:4px;border:none;border-radius:10px;padding:10px 18px;font-size:14px;cursor:pointer;transition:.15s}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--brand);color:#fff}
.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text)}
.btn-danger{background:var(--red);color:#fff}
.btn-block{width:100%}
.btn:disabled{opacity:.6;cursor:default}
.btn-spinner{display:inline-block;width:14px;height:14px;border:2px solid rgba(0,0,0,.2);border-top-color:currentColor;border-radius:50%;animation:spin .8s linear infinite;vertical-align:-2px;margin-right:2px}
@keyframes spin{to{transform:rotate(360deg)}}

/* 登录 */
#login-page{display:none;min-height:100vh;align-items:center;justify-content:center;background:linear-gradient(135deg,#eef2ff,#f5f6fa)}
.login-card{width:340px;max-width:92vw;background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:32px 28px;box-shadow:0 12px 40px rgba(0,0,0,.08)}
.login-msg{color:var(--red);font-size:12px;margin-top:8px;min-height:18px;text-align:center}

/* 布局(car 同款) */
#app{min-height:100vh}
#sidebar{width:220px;background:var(--bg-sidebar);border-right:1px solid var(--border-light);position:fixed;top:0;left:0;bottom:0;z-index:100;overflow-y:auto;padding:40px 20px 0;transition:width .3s ease,padding .3s ease}
#sidebar.collapsed{width:84px;padding:40px 12px 0;scrollbar-width:none;-ms-overflow-style:none}
#sidebar.collapsed::-webkit-scrollbar{display:none}
#sidebar.collapsed .side-logo{visibility:hidden;text-align:center}
#sidebar.collapsed .side-item{justify-content:flex-start;padding:8px 0 8px 20px;font-size:0;gap:0}
#sidebar.collapsed .side-item svg{margin:0}
#sidebar.collapsed .side-gt{display:flex;align-items:center;justify-content:center;text-align:center;font-size:0;height:21px;margin-bottom:16px;width:calc(100% + 1px)}
#sidebar.collapsed .side-gt::after{content:'\2022\2022\2022';font-size:14px;line-height:1;letter-spacing:2px;display:block}
.side-logo{padding:8px 0 12px;font-size:18px;font-weight:700;color:var(--text)}
@media(max-width:1024px){#sidebar .side-logo{display:none}}
.side-group{margin-bottom:24px}.side-gt{font-size:14px;line-height:1.5;color:var(--text-dim);text-transform:uppercase;margin-bottom:16px}
.side-item{display:flex;align-items:center;gap:10px;border-radius:8px;padding:8px 12px;font-size:14px;line-height:1.5;font-weight:500;cursor:pointer;color:var(--text-dim);transition:.15s;margin-bottom:4px}
body.dark .side-item{color:rgba(255,255,255,.7)}
.side-item:hover{background:rgba(255,255,255,.05)}
.side-item:hover{background:rgba(0,0,0,.05)}
.side-item.active{background:var(--brand-bg);color:var(--brand-text)}
.side-item svg{flex-shrink:0;opacity:.7}.side-item.active svg{opacity:1}
.side-item .badge{background:var(--red);color:#fff;border-radius:10px;font-size:11px;padding:1px 7px;margin-left:auto}
#main-area{margin-left:220px;flex:1;display:flex;flex-direction:column;min-width:0;transition:margin-left .3s ease}
#sidebar.collapsed~#main-area{margin-left:84px}
#topbar{background:var(--bg);border-bottom:1px solid var(--border);padding:0 24px;height:64px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:50}
#topbar-right{display:flex;align-items:center;gap:4px}
#content{padding:24px;flex:1;overflow-x:auto}
.user-menu-item{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:8px;cursor:pointer;font-size:14px;color:var(--text);transition:.1s}
.user-menu-item:hover{background:rgba(0,0,0,.05)}
@media(max-width:1024px){
 #sidebar{position:fixed;top:64px;left:0;bottom:0;transform:translateX(-100%);width:220px;padding:20px;transition:transform .3s ease;z-index:99}
 #sidebar.mobile-open{transform:translateX(0)}
 #main-area{margin-left:0!important}
 #sidebar-toggle-btn{display:flex!important}
 #sidebar-toggle-btn{border:none!important}
 #sidebar.mobile-open~#main-area #sidebar-toggle-btn{border:1px solid var(--border)!important}
}

/* 通用 */
.section-hd{display:flex;align-items:center;gap:8px;margin-bottom:14px;flex-wrap:wrap}
.section-hd .btn{margin-left:auto}
.section-hd h2{font-size:17px;font-weight:700}
.sec-count{color:var(--text-dim);font-size:12px}
.back-row{display:flex;align-items:center;gap:8px;margin-bottom:6px}
.empty{color:var(--text-dim);text-align:center;padding:40px 0;font-size:14px}

/* 卡片 */
.vehicle-list{display:flex;flex-direction:column;gap:10px}
.vehicle-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:14px;cursor:pointer;transition:.15s}
.vehicle-card:active{transform:scale(.99)}
.vc-top{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:6px}
.vc-plate{font-size:16px;font-weight:700}
.vc-owner{color:var(--text-dim);font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.vc-meta{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--text-dim);flex-wrap:wrap}
.rec-list{display:flex;flex-direction:column;gap:10px}
.rec{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:14px;display:flex;align-items:center;gap:10px}
.rec-main{flex:1;min-width:0}
.rec-title{font-size:14px;font-weight:600;margin-bottom:4px;word-break:break-all}
.rec-sub{display:flex;gap:10px;font-size:12px;color:var(--text-dim);flex-wrap:wrap}
.tag{display:inline-block;border-radius:6px;padding:2px 8px;font-size:11px;white-space:nowrap}
.tag-warranty{background:rgba(16,185,129,.12);color:var(--green)}
.tag-near{background:rgba(245,158,11,.15);color:var(--amber)}
.tag-expired{background:rgba(239,68,68,.12);color:var(--red)}
.tag-brand{background:rgba(79,124,255,.12);color:var(--brand)}

/* 做题 */
.q-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:14px}
.q-head{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.q-type{font-size:12px;padding:2px 8px;border-radius:6px;background:rgba(79,124,255,.12);color:var(--brand)}
.q-stem{font-size:15px;line-height:1.8;margin-bottom:12px;white-space:pre-wrap;word-break:break-all}
.q-option{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid var(--border);border-radius:10px;margin-bottom:8px;cursor:pointer;transition:.15s}
.q-option:hover{border-color:var(--brand)}
.q-option.sel{border-color:var(--brand);background:rgba(79,124,255,.06)}
.q-option input{accent-color:var(--brand)}
.q-opt-letter{font-weight:700;color:var(--brand);flex-shrink:0}
.q-answer-txt{width:100%;margin-top:4px}

/* 成绩 */
.res-score{text-align:center;padding:28px 0;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:14px}
.res-num{font-size:44px;font-weight:800;color:var(--brand)}
.res-line{color:var(--text-dim);font-size:13px;margin-top:6px}
.res-q{margin-bottom:12px}
.res-q-correct{border-left:3px solid var(--green)}
.res-q-wrong{border-left:3px solid var(--red)}

/* modal */
#modal-root{position:fixed;inset:0;z-index:200;display:none}
#modal-root.on{display:block}
.modal-mask{position:absolute;inset:0;background:rgba(0,0,0,.45);animation:overlayIn .18s}
.modal-box{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:92%;max-width:480px;max-height:86vh;overflow-y:auto;background:var(--bg-card);border-radius:16px;padding:22px;animation:popIn .18s}
.modal-title{font-size:16px;font-weight:700;margin-bottom:14px}
.form-row{margin-bottom:12px}
.form-row label{display:block;font-size:13px;color:var(--text-dim);margin-bottom:6px}
.form-row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:18px}
@keyframes overlayIn{from{opacity:0}to{opacity:1}}
@keyframes popIn{from{opacity:0;transform:translate(-50%,-50%) scale(.95)}to{opacity:1;transform:translate(-50%,-50%) scale(1)}}

#toast-root{position:fixed;top:20px;left:50%;transform:translateX(-50%);z-index:500;display:flex;flex-direction:column;gap:8px;align-items:center}
.toast{background:#111;color:#fff;padding:10px 20px;border-radius:10px;font-size:13px;animation:toastIn .2s;max-width:80vw}
.toast.err{background:var(--red)}
@keyframes toastIn{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}

/* 页面切换弹出效果(outpanel 同款) */
#content.fade-in{animation:contentFade .25s ease}
@keyframes contentFade{from{opacity:0;transform:scale(.96)}to{opacity:1;transform:scale(1)}}

/* 首页价值介绍 */
.home-hero{background:linear-gradient(120deg,#465fff,#7c8cff 60%,#a78bfa);border-radius:16px;padding:38px 30px;color:#fff;margin-bottom:16px}
.home-hero-badge{display:inline-block;background:rgba(255,255,255,.18);border-radius:20px;padding:4px 14px;font-size:12px;margin-bottom:14px}
.home-hero-title{font-size:30px;font-weight:800;letter-spacing:2px;margin-bottom:10px}
.home-hero-slogan{font-size:16px;font-weight:600;opacity:.95;margin-bottom:8px}
.home-hero-desc{font-size:13px;opacity:.85;line-height:1.8;max-width:520px}
.home-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.home-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:20px}
.home-card .hc-icon{font-size:26px;margin-bottom:10px}
.home-card .hc-title{font-weight:700;font-size:15px;margin-bottom:6px}
.home-card .hc-desc{font-size:12px;color:var(--text-dim);line-height:1.8}
@media(max-width:768px){.home-cards{grid-template-columns:1fr}}

/* 搭建工作台 */
.bld-steps{display:flex;align-items:center;background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:14px 18px;flex-wrap:wrap;gap:6px}
.bld-step{display:flex;align-items:center;gap:8px;cursor:pointer;padding:6px 10px;border-radius:8px;transition:.15s}
.bld-step:hover{background:var(--bg)}
.bld-step.cur{background:var(--brand-bg)}
.bld-step.cur .bld-name{color:var(--brand);font-weight:700}
.bld-step.done .bld-num{background:var(--green);border-color:var(--green);color:#fff}
.bld-num{width:22px;height:22px;border-radius:50%;border:1.5px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:var(--text-dim);flex-shrink:0}
.bld-name{font-size:13px;white-space:nowrap}
.bld-line{flex:1;min-width:16px;height:1.5px;background:var(--border)}
.bld-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:20px;margin-bottom:14px}
.bld-card h3{font-size:16px;margin-bottom:14px}
.bld-nav{display:flex;gap:10px;justify-content:flex-end;margin-top:16px}
.mode-switch{display:flex;gap:8px}
.mode-btn{flex:1;padding:12px;border:1.5px solid var(--border);border-radius:10px;text-align:center;cursor:pointer;transition:.15s;background:var(--bg-card)}
.mode-btn.on{border-color:var(--brand);background:var(--brand-bg)}
.mode-btn .mb-icon{font-size:22px;margin-bottom:6px}
.mode-btn .mb-name{font-weight:700;font-size:14px}
.mode-btn .mb-desc{font-size:11px;color:var(--text-dim);margin-top:3px}
.wf-node{display:flex;align-items:center;gap:10px;background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:12px;margin-bottom:8px}
.wf-node .wn-idx{width:24px;height:24px;border-radius:50%;background:var(--brand-bg);color:var(--brand);font-weight:700;font-size:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.wf-node .wn-main{flex:1;min-width:0}
.wf-node .wn-name{font-weight:600;font-size:13px}
.wf-node .wn-prompt{font-size:12px;color:var(--text-dim);margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.wf-node .wn-ops{display:flex;gap:4px;flex-shrink:0}
.wn-op{width:28px;height:28px;border-radius:8px;border:1px solid var(--border);background:var(--bg-card);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--text-dim)}
.wn-op:hover{border-color:var(--brand);color:var(--brand)}
.wn-op.del:hover{border-color:var(--red);color:var(--red)}
.test-out{background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:14px;margin-top:10px;white-space:pre-wrap;line-height:1.8;font-size:13px;max-height:320px;overflow-y:auto}
@media(max-width:768px){.bld-name{display:none}}

/* 板块主页 */
.gen-banner{background:linear-gradient(120deg,var(--brand),#7c8cff);border-radius:14px;padding:26px 22px;color:#fff;margin-bottom:18px}
.gen-banner h2{font-size:20px;margin-bottom:6px}
.gen-banner p{font-size:13px;opacity:.9;line-height:1.7}
.gen-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.gen-card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:18px;cursor:pointer;transition:.15s}
.gen-card:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:0 6px 18px rgba(70,95,255,.1)}
.gen-card .gc-icon{font-size:26px;margin-bottom:10px}
.gen-card .gc-name{font-weight:700;font-size:15px;margin-bottom:4px}
.gen-card .gc-desc{font-size:12px;color:var(--text-dim);line-height:1.6}
.genout-box{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:20px;line-height:1.9;white-space:pre-wrap;word-break:break-all;font-size:14px}

/* Bot 对话 */
.bot-chat{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:16px;height:calc(100vh - 240px);min-height:340px;overflow-y:auto;display:flex;flex-direction:column;gap:12px}
.msg{max-width:85%;padding:10px 14px;border-radius:12px;font-size:14px;line-height:1.8;white-space:pre-wrap;word-break:break-all}
.msg.user{align-self:flex-end;background:var(--brand);color:#fff}
.msg.bot{align-self:flex-start;background:var(--bg);border:1px solid var(--border);color:var(--text)}
.bot-input-bar{display:flex;gap:8px;margin-top:10px}
.bot-input-bar .inp{flex:1}

/* 知识库/工作流/学情 */
.doc-upload{display:flex;gap:10px;flex-wrap:wrap}
.guide-item{background:var(--bg);border-radius:10px;padding:12px;margin-bottom:10px;font-size:13px}
.guide-item b{display:block;margin-bottom:3px;font-size:14px}
.wf-step{background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:12px;margin-bottom:8px}
.wf-step .ws-head{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.wf-step .ws-type{font-size:11px;padding:2px 8px;border-radius:6px;background:rgba(70,95,255,.12);color:var(--brand)}
.stu-rec{font-size:13px;line-height:1.8;border-bottom:1px dashed var(--border);padding:6px 0}
@media(max-width:1024px){.bot-chat{height:60vh}}