/* ===== 知帆 V3.1 原型 · 设计系统 ===== */
:root{
  --bg:#f6f5f1;
  --panel:#ffffff;
  --ink:#22252b;
  --ink2:#6f7480;
  --ink3:#9aa0ab;
  --line:#e9e7e1;
  --brand:#3457d5;
  --brand-deep:#27419f;
  --brand-soft:#edf0fc;
  --accent:#0f766e;
  --accent-soft:#e6f4f2;
  --warn:#b45309;
  --radius:14px;
  --shadow:0 1px 2px rgba(30,30,40,.05),0 8px 24px rgba(30,30,40,.06);
  --nav-h:56px;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);
  font-size:14px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;font-size:inherit}
input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}
::selection{background:var(--brand-soft)}

/* ===== 顶部导航 ===== */
.topnav{
  height:var(--nav-h);background:var(--panel);border-bottom:1px solid var(--line);
  display:flex;align-items:center;padding:0 20px;gap:28px;
  position:sticky;top:0;z-index:50;
}
.topnav .brand{display:flex;align-items:center;gap:9px;font-size:17px;font-weight:700;letter-spacing:1px}
.topnav .brand small{font-size:11px;font-weight:400;color:var(--ink3);letter-spacing:0;margin-left:2px}
.mainnav{display:flex;gap:4px;flex:1}
.mainnav a{
  padding:6px 16px;border-radius:99px;color:var(--ink2);font-size:14px;transition:.15s;
}
.mainnav a:hover{background:var(--bg);color:var(--ink)}
.mainnav a.active{background:var(--ink);color:#fff;font-weight:600}
.usermenu{display:flex;align-items:center;gap:12px}
.avatar{
  width:32px;height:32px;border-radius:50%;background:var(--brand);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;
}

/* ===== 通用元素 ===== */
.btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 18px;border-radius:10px;font-size:13.5px;font-weight:500;
  background:var(--brand);color:#fff;transition:.15s;
}
.btn:hover{background:var(--brand-deep)}
.btn.ghost{background:transparent;color:var(--ink2);border:1px solid var(--line)}
.btn.ghost:hover{border-color:var(--ink3);color:var(--ink)}
.btn.ink{background:var(--ink);color:#fff}
.btn.ink:hover{background:#000}
.btn.sm{padding:5px 12px;font-size:12.5px;border-radius:8px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.chip{
  display:inline-flex;align-items:center;gap:4px;
  padding:3px 10px;border-radius:99px;font-size:12px;
  background:var(--bg);border:1px solid var(--line);color:var(--ink2);
}
.chip.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.chip.brand{background:var(--brand-soft);color:var(--brand);border-color:transparent}
.muted{color:var(--ink2)}
.tiny{font-size:12px;color:var(--ink3)}
.page{max-width:1200px;margin:0 auto;padding:24px 20px 60px}
.progress{height:6px;border-radius:99px;background:var(--line);overflow:hidden}
.progress>i{display:block;height:100%;border-radius:99px;background:var(--brand);transition:width .3s}
.tag-type{font-size:11px;padding:1px 8px;border-radius:6px;background:var(--accent-soft);color:var(--accent)}

/* ===== 三栏应用布局（问/学） ===== */
.app{display:grid;grid-template-columns:230px 1fr 300px;height:calc(100vh - var(--nav-h))}
.app.no-right{grid-template-columns:230px 1fr}
.side{border-right:1px solid var(--line);background:var(--panel);overflow-y:auto;padding:16px 12px}
.side-r{border-left:1px solid var(--line);border-right:none;background:var(--panel);overflow-y:auto;padding:16px}
.side-r.collapsed{display:none}
.side h4{font-size:12px;color:var(--ink3);font-weight:500;padding:8px 10px 4px;letter-spacing:1px}
.main{overflow-y:auto;display:flex;flex-direction:column}

/* ===== 首页（问） ===== */
.sess-item{padding:8px 10px;border-radius:8px;cursor:pointer;color:var(--ink2);font-size:13.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sess-item:hover{background:var(--bg);color:var(--ink)}
.sess-item.on{background:var(--brand-soft);color:var(--brand);font-weight:500}
.new-sess{margin:4px 10px 10px;display:flex;align-items:center;gap:6px;color:var(--ink2);font-size:13px;padding:7px 10px;border:1px dashed var(--line);border-radius:8px;cursor:pointer}
.new-sess:hover{border-color:var(--brand);color:var(--brand)}

.chat-wrap{flex:1;display:flex;flex-direction:column;max-width:820px;width:100%;margin:0 auto;padding:24px 28px 0}
.welcome{margin:auto 0;padding-bottom:20px}
.welcome h1{font-size:26px;font-weight:700;margin-bottom:6px}
.welcome .sub{color:var(--ink2);margin-bottom:26px}
.wcards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.wcard{padding:16px;border-radius:var(--radius);background:var(--panel);border:1px solid var(--line);cursor:pointer;transition:.15s}
.wcard:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:var(--shadow)}
.wcard .ico{font-size:20px;margin-bottom:8px}
.wcard .t{font-weight:600;margin-bottom:2px}
.wcard .d{font-size:12.5px;color:var(--ink2)}

.msgs{display:flex;flex-direction:column;gap:20px;padding-bottom:16px}
.msg.u{align-self:flex-end;background:var(--ink);color:#fff;padding:10px 16px;border-radius:16px 16px 4px 16px;max-width:70%}
.msg.a{align-self:flex-start;max-width:88%}
.msg.a .body{background:var(--panel);border:1px solid var(--line);border-radius:4px 16px 16px 16px;padding:14px 18px}
.msg.a .who{font-size:12px;color:var(--ink3);margin-bottom:6px;display:flex;align-items:center;gap:6px}
.cite{font-size:11px;color:var(--brand);background:var(--brand-soft);border-radius:4px;padding:0 4px;margin:0 1px;cursor:pointer}

.ask-box{border-top:1px solid var(--line);background:var(--bg);padding:14px 28px 18px}
.ask-inner{max-width:820px;margin:0 auto}
.scope-row{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.scope-chip{display:inline-flex;align-items:center;gap:6px;background:var(--panel);border:1px solid var(--line);border-radius:99px;padding:4px 12px;font-size:12.5px;color:var(--ink2);cursor:pointer;position:relative}
.scope-chip:hover{border-color:var(--ink3)}
.scope-menu{position:absolute;bottom:calc(100% + 6px);left:0;background:var(--panel);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);min-width:180px;padding:4px;display:none;z-index:10}
.scope-menu.open{display:block}
.scope-menu div{padding:7px 12px;border-radius:7px;cursor:pointer;font-size:13px}
.scope-menu div:hover{background:var(--bg)}
.input-row{display:flex;gap:10px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:10px 10px 10px 16px;align-items:center;transition:.15s}
.input-row:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.input-row input{flex:1;border:none;outline:none;background:transparent;font-size:14.5px}
.send-btn{width:38px;height:38px;border-radius:10px;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.send-btn:hover{background:var(--brand-deep)}
.mode-toggle{font-size:12px;padding:4px 10px;border-radius:99px;border:1px solid var(--line);color:var(--ink3);transition:.15s;flex-shrink:0}
.mode-toggle.on{background:var(--accent-soft);color:var(--accent);border-color:transparent;font-weight:600}

.analysis-card{border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-top:4px}
.analysis-card .ac-h{background:var(--accent-soft);padding:8px 14px;font-size:12.5px;font-weight:600;color:var(--accent);display:flex;justify-content:space-between;align-items:center}
.analysis-card .ac-b{padding:12px 14px}
.analysis-card .ac-b h5{font-size:12px;color:var(--ink3);font-weight:500;margin:8px 0 4px}
.analysis-card .ac-b h5:first-child{margin-top:0}
.ac-actions{display:flex;gap:6px}
.ac-actions button{font-size:11.5px;color:var(--ink2);padding:2px 8px;border-radius:6px;border:1px solid var(--line);background:#fff}
.ac-actions button:hover{color:var(--ink)}

.src-item{padding:10px 12px;border:1px solid var(--line);border-radius:10px;margin-bottom:8px;cursor:pointer;transition:.15s}
.src-item:hover{border-color:var(--brand)}
.src-item .st{font-size:13px;font-weight:500;margin-bottom:2px}
.src-item .ss{font-size:12px;color:var(--ink2)}
.src-item .sim{font-size:11px;color:var(--accent)}
.panel-toggle{position:fixed;right:0;top:50%;z-index:40;background:var(--panel);border:1px solid var(--line);border-right:none;border-radius:8px 0 0 8px;padding:8px 4px;font-size:12px;color:var(--ink3);cursor:pointer}

/* ===== 空间页（学） ===== */
.book-item{padding:10px 12px;border-radius:10px;cursor:pointer;margin-bottom:2px}
.book-item:hover{background:var(--bg)}
.book-item.on{background:var(--brand-soft)}
.book-item .bt{font-size:13.5px;font-weight:500}
.book-item.on .bt{color:var(--brand)}
.book-item .bd{font-size:12px;color:var(--ink3);margin-top:2px}
.book-item .progress{margin-top:6px}
.upload-btn{margin:8px 4px 14px;display:flex;align-items:center;justify-content:center;gap:6px;padding:9px;border:1px dashed var(--line);border-radius:10px;color:var(--ink2);font-size:13px;cursor:pointer}
.upload-btn:hover{border-color:var(--brand);color:var(--brand)}

.space-head{padding:16px 24px 0;display:flex;align-items:baseline;gap:14px}
.space-head h2{font-size:18px}
.tabs{display:flex;gap:2px;padding:12px 24px 0;border-bottom:1px solid var(--line)}
.tabs button{padding:8px 18px;font-size:14px;color:var(--ink2);border-radius:10px 10px 0 0;position:relative}
.tabs button.on{color:var(--ink);font-weight:600;background:var(--panel);border:1px solid var(--line);border-bottom-color:#fff;margin-bottom:-1px}
.view{flex:1;overflow-y:auto;padding:20px 24px;background:var(--panel)}

.tree{line-height:2}
.tree details{margin-left:14px}
.tree summary{cursor:pointer;font-weight:600;font-size:14px;list-style:none;display:flex;align-items:center;gap:6px}
.tree summary::-webkit-details-marker{display:none}
.tree summary::before{content:"▸";color:var(--ink3);font-size:11px;transition:.15s}
.tree details[open]>summary::before{transform:rotate(90deg)}
.chapter-row{display:flex;align-items:center;gap:8px}
.chapter-row .do-chapter{opacity:0;font-size:11.5px;color:var(--brand);padding:1px 8px;border-radius:6px;background:var(--brand-soft);transition:.15s;white-space:nowrap}
.chapter-row:hover .do-chapter{opacity:1}
.kp{padding:2px 10px;border-radius:6px;cursor:pointer;color:var(--ink2);font-size:13.5px;display:inline-block}
.kp:hover{background:var(--bg);color:var(--ink)}
.kp.on{background:var(--brand-soft);color:var(--brand);font-weight:600}
.kp.done::after{content:" ✓";color:var(--accent);font-size:11px}

.graph-box{width:100%;height:100%;min-height:420px}
.gnode{cursor:pointer}
.gnode circle{fill:#fff;stroke:var(--brand);stroke-width:1.5;transition:.15s}
.gnode.on circle{fill:var(--brand);stroke:var(--brand)}
.gnode text{font-size:11px;fill:var(--ink2)}
.gnode.on text{fill:var(--ink);font-weight:600}
.gedge{stroke:var(--line);stroke-width:1.2}

.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.kcard{padding:14px;border:1px solid var(--line);border-radius:12px;cursor:pointer;transition:.15s;background:#fff}
.kcard:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:var(--shadow)}
.kcard .kt{font-weight:600;font-size:13.5px;margin:6px 0 4px}
.kcard .kd{font-size:12.5px;color:var(--ink2);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.filter-row{display:flex;gap:6px;margin-bottom:14px}

.detail-h{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.detail-h b{font-size:14px}
.detail-sec{margin-bottom:12px}
.detail-sec h6{font-size:11.5px;color:var(--ink3);font-weight:500;margin-bottom:3px;letter-spacing:1px}
.detail-sec p{font-size:13px}
.quote{border-left:3px solid var(--line);padding:4px 10px;color:var(--ink2);font-size:12.5px;background:var(--bg);border-radius:0 8px 8px 0}
.rel-chips{display:flex;flex-wrap:wrap;gap:6px}
.detail-actions{display:flex;gap:8px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line)}
.detail-empty{color:var(--ink3);text-align:center;padding:60px 10px;font-size:13px}

.space-foot{border-top:1px solid var(--line);background:var(--panel);padding:10px 24px;display:flex;gap:10px;align-items:center}

/* ===== 探知（荐） ===== */
.rec-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px;margin-bottom:36px}
.rec-card{padding:18px;display:flex;flex-direction:column;gap:8px;transition:.15s}
.rec-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--brand)}
.rec-card .rh{display:flex;align-items:center;gap:8px}
.rec-card .rt{font-weight:600;font-size:14.5px}
.rec-why{background:var(--accent-soft);border-radius:8px;padding:8px 10px;font-size:12.5px;color:var(--accent)}
.rec-why b{font-weight:600}
.rec-meta{font-size:12px;color:var(--ink3);margin-top:auto;display:flex;justify-content:space-between;align-items:center}
.sec-title{font-size:16px;font-weight:700;margin-bottom:4px}
.sec-sub{font-size:13px;color:var(--ink2);margin-bottom:18px}

.path{border-left:2px solid var(--line);margin-left:8px;padding-left:24px;display:flex;flex-direction:column;gap:0}
.path-step{position:relative;padding:0 0 22px 4px}
.path-step::before{content:"";position:absolute;left:-31px;top:5px;width:12px;height:12px;border-radius:50%;background:#fff;border:2px solid var(--ink3)}
.path-step.done::before{background:var(--accent);border-color:var(--accent)}
.path-step.now::before{border-color:var(--brand);background:var(--brand-soft);box-shadow:0 0 0 4px var(--brand-soft)}
.path-step .pt{font-weight:600;font-size:14px}
.path-step .pd{font-size:12.5px;color:var(--ink2)}
.path-step .pa{margin-top:6px}
.goal-bar{display:flex;gap:10px;margin:26px 0 22px;max-width:640px}
.goal-bar input{flex:1;border:1px solid var(--line);border-radius:12px;padding:10px 16px;outline:none;background:#fff}
.goal-bar input:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}

/* ===== 训战（练） ===== */
.train-head{display:flex;align-items:center;gap:14px;margin-bottom:20px}
.train-head h2{font-size:20px}
.train-tabs{display:flex;gap:8px;margin-bottom:22px}
.train-tabs button{padding:8px 20px;border-radius:99px;font-size:14px;color:var(--ink2);border:1px solid var(--line);background:#fff}
.train-tabs button.on{background:var(--ink);color:#fff;border-color:var(--ink);font-weight:600}
.stat-row{display:flex;align-items:center;gap:20px;padding:18px 20px;margin-bottom:18px}
.stat-row .big{font-size:22px;font-weight:700}
.ch-row{display:flex;align-items:center;gap:12px;padding:13px 16px;border:1px solid var(--line);border-radius:12px;margin-bottom:8px;background:#fff;transition:.15s}
.ch-row:hover{border-color:var(--brand)}
.ch-row .ct{flex:1}
.ch-row .ct b{font-size:14px}
.ch-row .cs{font-size:12px;color:var(--ink3)}
.ch-state{font-size:11.5px;padding:2px 10px;border-radius:99px}
.ch-state.done{background:var(--accent-soft);color:var(--accent)}
.ch-state.doing{background:var(--brand-soft);color:var(--brand)}
.ch-state.todo{background:var(--bg);color:var(--ink3)}
.ch-row .do-chapter{opacity:0;transition:.15s}
.ch-row:hover .do-chapter{opacity:1}
.review-hero{padding:24px;text-align:center;margin-bottom:18px}
.review-hero .num{font-size:36px;font-weight:700;color:var(--brand)}
.wrong-item{padding:14px 16px;border:1px solid var(--line);border-radius:12px;margin-bottom:10px;background:#fff}
.wrong-item .wq{font-size:13.5px;font-weight:500;margin-bottom:6px}
.wrong-item .wa{font-size:12.5px;color:var(--ink2)}
.wrong-item .wl{font-size:12px;color:var(--brand);margin-top:6px;cursor:pointer}

/* 答题专注页 */
.quiz-mask{position:fixed;inset:0;background:#1c1e24;z-index:100;display:none;flex-direction:column}
.quiz-mask.open{display:flex}
.quiz-top{height:52px;display:flex;align-items:center;padding:0 20px;color:#c8ccd4;gap:16px;border-bottom:1px solid rgba(255,255,255,.08)}
.quiz-top .qn-dots{display:flex;gap:8px;flex:1;justify-content:center}
.qn-dot{width:26px;height:26px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:12px;color:#8a8f9a;background:rgba(255,255,255,.06);cursor:pointer}
.qn-dot.cur{background:var(--brand);color:#fff}
.qn-dot.answered{background:rgba(52,87,213,.35);color:#c3d0f5}
.quiz-body{flex:1;display:flex;align-items:center;justify-content:center;overflow-y:auto;padding:30px}
.quiz-card{width:640px;max-width:92%;background:#fff;border-radius:18px;padding:32px 36px}
.quiz-card .qt{font-size:17px;font-weight:600;margin-bottom:20px;line-height:1.7}
.opt{display:flex;gap:12px;align-items:flex-start;padding:13px 16px;border:1.5px solid var(--line);border-radius:12px;margin-bottom:10px;cursor:pointer;transition:.12s}
.opt:hover{border-color:var(--brand)}
.opt.sel{border-color:var(--brand);background:var(--brand-soft)}
.opt .k{width:22px;height:22px;border-radius:50%;border:1.5px solid var(--ink3);color:var(--ink3);font-size:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px}
.opt.sel .k{background:var(--brand);border-color:var(--brand);color:#fff}
.quiz-foot{display:flex;justify-content:space-between;margin-top:22px}
/* 教练报告 */
.report{width:680px;max-width:94%;background:#fff;border-radius:18px;padding:34px 38px;max-height:82vh;overflow-y:auto}
.score-row{display:flex;align-items:center;gap:26px;margin-bottom:24px}
.score-ring{width:96px;height:96px;position:relative;flex-shrink:0}
.score-ring svg{transform:rotate(-90deg)}
.score-ring .sv{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.score-ring .sv b{font-size:26px}
.score-ring .sv span{font-size:11px;color:var(--ink3)}
.rsec{margin-bottom:18px}
.rsec h5{font-size:13px;color:var(--ink3);font-weight:500;letter-spacing:1px;margin-bottom:8px}
.weak-item{border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin-bottom:8px}
.weak-item .wt{font-size:13.5px;font-weight:600;margin-bottom:3px}
.weak-item .wd{font-size:12.5px;color:var(--ink2)}
.weak-item .wlink{font-size:12px;color:var(--brand);cursor:pointer;margin-top:5px;display:inline-block}

/* ===== 管理 ===== */
.admin-grid{display:grid;grid-template-columns:200px 1fr;gap:24px;align-items:start}
.admin-menu .mi{padding:9px 14px;border-radius:10px;cursor:pointer;color:var(--ink2);font-size:13.5px;margin-bottom:2px}
.admin-menu .mi:hover{background:var(--bg);color:var(--ink)}
.admin-menu .mi.on{background:var(--brand-soft);color:var(--brand);font-weight:600}
.admin-menu .mi.lock{color:var(--ink3)}
.form-row{margin-bottom:16px}
.form-row label{display:block;font-size:12.5px;color:var(--ink2);margin-bottom:5px}
.form-row input,.form-row select{width:100%;max-width:420px;border:1px solid var(--line);border-radius:10px;padding:9px 12px;outline:none;background:#fff}
.form-row input:focus{border-color:var(--brand)}
table.tb{width:100%;border-collapse:collapse;font-size:13.5px}
table.tb th{text-align:left;font-size:12px;color:var(--ink3);font-weight:500;padding:8px 12px;border-bottom:1px solid var(--line)}
table.tb td{padding:10px 12px;border-bottom:1px solid var(--line)}
.lock-panel{text-align:center;padding:60px 20px;color:var(--ink2)}
.lock-panel .li{font-size:34px;margin-bottom:12px}

/* ===== 登录页 ===== */
.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:
  radial-gradient(1200px 600px at 80% -10%,#e4e9fb 0%,transparent 60%),
  radial-gradient(900px 500px at 0% 110%,#e0f2ef 0%,transparent 55%),var(--bg)}
.login-card{display:grid;grid-template-columns:1fr 1fr;width:820px;max-width:94vw;background:#fff;border-radius:22px;overflow:hidden;box-shadow:0 20px 60px rgba(30,40,80,.12)}
.login-brand{background:linear-gradient(150deg,#22315f,#3457d5);color:#fff;padding:52px 44px;display:flex;flex-direction:column}
.login-brand h1{font-size:30px;letter-spacing:2px;margin:14px 0 10px}
.login-brand p{color:#c3cfF5;font-size:13.5px;line-height:1.9}
.login-brand .foot{margin-top:auto;font-size:12px;color:#9fb0e8}
.login-form{padding:52px 44px}
.login-form h2{font-size:19px;margin-bottom:24px}
.login-form .form-row input{max-width:none}
.login-form .btn{width:100%;justify-content:center;padding:11px;margin-top:6px}
.login-alt{display:flex;justify-content:space-between;align-items:center;margin-top:16px;font-size:12.5px;color:var(--ink2)}
.login-alt a{color:var(--brand);cursor:pointer}
.guest-btn{width:100%;margin-top:14px;padding:10px;border:1px dashed var(--line);border-radius:10px;color:var(--ink2);font-size:13px;text-align:center;cursor:pointer;transition:.15s}
.guest-btn:hover{border-color:var(--brand);color:var(--brand)}
.sso-note{margin-top:22px;padding-top:16px;border-top:1px solid var(--line);font-size:12px;color:var(--ink3);display:flex;gap:8px;align-items:center}

::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:#d8d5cd;border-radius:99px}
::-webkit-scrollbar-thumb:hover{background:#c2bfb6}