/* ═══════════════════════════════════════════════════════════
   智编课堂 · LLM辅助编程教学平台 — 设计系统
   ═══════════════════════════════════════════════════════════ */
:root{
  --blue:#1a6dff; --blue-deep:#0f56d9; --blue-soft:#eaf2ff; --blue-border:#bcd6ff;
  --violet:#7c3aed; --cyan:#0891b2; --amber:#d97706; --green:#16a34a; --green-soft:#e8f7ee;
  --red:#e5484d; --red-deep:#c93a3f; --red-soft:#fdecec; --red-border:#f5c2c4;
  --ink:#1f2733; --ink-2:#5b6472; --ink-3:#8a93a3;
  --bg:#eef1f6; --surface:#ffffff; --surface-2:#f6f8fb; --line:#e3e8f0; --line-2:#d3dae6;
  --chat-bg:#e9eef6;
  --term-bg:#0b1220; --term-ink:#dbe4f0; --term-dim:#7d8aa0; --term-green:#4ade80; --term-red:#ff7b72; --term-cyan:#56d4dd; --term-amber:#e3b341;
  --code-key:#a626a4; --code-str:#e45649; --code-num:#b76b01; --code-com:#c18401; --code-builtin:#4078f2; --code-ink:#383a42;
  --radius:14px; --radius-sm:9px;
  --shadow:0 1px 2px rgba(16,24,40,.05),0 10px 28px rgba(16,24,40,.06);
  --shadow-pop:0 6px 16px rgba(16,24,40,.10),0 24px 64px rgba(16,24,40,.16);
  --font-ui:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;
  --code-size:15px; --code-lh:24px;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
body{font-family:var(--font-ui);color:var(--ink);background:var(--bg);font-size:14px;line-height:1.6;overflow:hidden;-webkit-font-smoothing:antialiased}
button{font-family:inherit;cursor:pointer}
input,textarea,select{font-family:inherit;font-size:inherit;color:inherit}
.hidden{display:none!important}
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:#c4cddc;border-radius:8px;border:2px solid transparent;background-clip:content-box}
::-webkit-scrollbar-thumb:hover{background:#9fb0c8;border:2px solid transparent;background-clip:content-box}
.terminal::-webkit-scrollbar-thumb{background:#33415c;border:2px solid transparent;background-clip:content-box}
.terminal::-webkit-scrollbar-thumb:hover{background:#46587a;border:2px solid transparent;background-clip:content-box}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:4px}

/* ── 按钮体系 ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border-radius:var(--radius-sm);border:1px solid transparent;font-size:13.5px;font-weight:600;padding:8px 16px;transition:all .16s ease;white-space:nowrap;user-select:none}
.btn:active{transform:scale(.97)}
.btn.sm{padding:5px 11px;font-size:12.5px;border-radius:8px}
.btn.primary{background:linear-gradient(135deg,#2f7dff,#1a6dff 55%,#0f56d9);color:#fff;box-shadow:0 2px 8px rgba(26,109,255,.32)}
.btn.primary:hover{filter:brightness(1.07);box-shadow:0 4px 14px rgba(26,109,255,.42);transform:translateY(-1px)}
.btn.outline{background:var(--surface);border-color:var(--blue-border);color:var(--blue)}
.btn.outline:hover{background:var(--blue-soft);border-color:var(--blue);transform:translateY(-1px);box-shadow:0 3px 10px rgba(26,109,255,.14)}
.btn.danger{background:linear-gradient(135deg,#f0595e,#e5484d);color:#fff;box-shadow:0 2px 8px rgba(229,72,77,.3)}
.btn.danger:hover{filter:brightness(1.06)}
.btn.danger-outline{background:var(--surface);border-color:var(--red-border);color:var(--red)}
.btn.danger-outline:hover{background:var(--red-soft);border-color:var(--red)}
.btn.ghost{background:transparent;color:var(--ink-3)}
.btn.ghost:hover{color:var(--ink);background:var(--surface-2)}
.btn.text-btn{background:none;border:none;color:var(--blue);font-weight:500;padding:4px 6px}
.btn.text-btn:hover{text-decoration:underline}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none!important}
.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:8px;border:1px solid var(--line);background:var(--surface);color:var(--ink-2);transition:all .15s}
.icon-btn svg{width:16px;height:16px}
.icon-btn:hover{color:var(--blue);border-color:var(--blue-border);background:var(--blue-soft)}
.bi{width:14px;height:14px;flex:none}

/* ═══════════ 登录视图 ═══════════ */
.login-view{position:fixed;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px;background:linear-gradient(160deg,#f2f5fb 0%,#e9eef8 45%,#eef3f9 100%);overflow:auto;padding:24px}
.login-bg{position:absolute;inset:0;overflow:hidden;pointer-events:none}
.orb{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5;animation:orbFloat 14s ease-in-out infinite alternate}
.orb-a{width:480px;height:480px;left:-120px;top:-140px;background:radial-gradient(circle,#bcd6ff,#dbeafe)}
.orb-b{width:420px;height:420px;right:-100px;bottom:-120px;background:radial-gradient(circle,#c7f0f5,#e0f2fe);animation-delay:-5s}
.orb-c{width:300px;height:300px;right:22%;top:-90px;background:radial-gradient(circle,#e6d9ff,#ede9fe);animation-delay:-9s}
@keyframes orbFloat{from{transform:translate(0,0) scale(1)}to{transform:translate(36px,26px) scale(1.08)}}
.grid-lines{position:absolute;inset:0;background-image:linear-gradient(rgba(26,109,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(26,109,255,.045) 1px,transparent 1px);background-size:44px 44px;mask-image:radial-gradient(ellipse 90% 80% at 50% 40%,#000 30%,transparent 75%)}
.login-card{position:relative;display:grid;grid-template-columns:1.08fr 1fr;width:min(880px,94vw);background:var(--surface);border-radius:22px;box-shadow:var(--shadow-pop);overflow:hidden;animation:cardIn .6s cubic-bezier(.2,.9,.3,1) both}
@keyframes cardIn{from{opacity:0;transform:translateY(26px) scale(.97)}to{opacity:1;transform:none}}
.login-brand{position:relative;padding:42px 38px 34px;color:#fff;background:linear-gradient(150deg,#0b2a6b 0%,#1240a8 34%,#1a6dff 68%,#0e9bd8 100%);overflow:hidden}
.login-brand::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 70% 50% at 85% -10%,rgba(94,234,212,.28),transparent 60%),radial-gradient(ellipse 60% 45% at -10% 100%,rgba(124,58,237,.35),transparent 60%)}
.login-brand>*{position:relative}
.brand-logo{width:52px;height:52px;border-radius:14px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);display:flex;align-items:center;justify-content:center;backdrop-filter:blur(4px);margin-bottom:18px}
.logo-mark{font-family:var(--font-mono);font-size:22px;font-weight:700;color:#a5f3fc}
.login-brand h1{font-size:30px;letter-spacing:2px;font-weight:800}
.brand-sub{margin:6px 0 26px;font-size:13.5px;color:#cfe0ff;letter-spacing:.5px}
.brand-feats{list-style:none;display:flex;flex-direction:column;gap:16px;margin-bottom:28px}
.brand-feats li{display:flex;gap:12px;align-items:flex-start}
.brand-feats b{display:block;font-size:14px;font-weight:700}
.brand-feats i{display:block;font-style:normal;font-size:12px;color:#b9cdf5;margin-top:1px}
.feat-ico{flex:none;width:34px;height:34px;border-radius:10px;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.22)}
.feat-ico svg{width:17px;height:17px}
.feat-ico.f1{color:#93c5fd}.feat-ico.f2{color:#fcd34d}.feat-ico.f3{color:#6ee7b7}
.brand-code{border-radius:12px;background:rgba(6,16,40,.55);border:1px solid rgba(255,255,255,.16);overflow:hidden;backdrop-filter:blur(4px)}
.bc-head{display:flex;align-items:center;gap:6px;padding:8px 12px;border-bottom:1px solid rgba(255,255,255,.1)}
.bc-head i{width:9px;height:9px;border-radius:50%;background:#ff5f57}
.bc-head i:nth-child(2){background:#febc2e}.bc-head i:nth-child(3){background:#28c840}
.bc-head span{margin-left:6px;font-size:11px;color:#8fa8d8;font-family:var(--font-mono)}
.brand-code pre{padding:12px 14px;font-family:var(--font-mono);font-size:12.5px;line-height:1.75;color:#dbe7ff}
.brand-code .ck{color:#c792ea}.brand-code .cs{color:#ff8a80}.brand-code .cb{color:#82aaff}.brand-code .cn{color:#f78c6c}
.login-form{padding:46px 42px 34px;display:flex;flex-direction:column;justify-content:center}
.login-form h2{font-size:23px;font-weight:800}
.lf-sub{color:var(--ink-3);font-size:13px;margin:4px 0 24px}
.field{margin-bottom:16px}
.field label{display:block;font-size:12.5px;font-weight:600;color:var(--ink-2);margin-bottom:6px}
.field input,.field textarea,.field select{width:100%;padding:10px 13px;border:1.5px solid var(--line-2);border-radius:10px;font-size:14px;background:var(--surface);transition:border .15s,box-shadow .15s}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(26,109,255,.14)}
.role-seg{display:grid;grid-template-columns:1fr 1fr;gap:6px;background:var(--surface-2);border:1.5px solid var(--line-2);border-radius:11px;padding:4px}
.role-opt{border:none;background:transparent;padding:8px;border-radius:8px;font-size:13.5px;font-weight:600;color:var(--ink-2);transition:all .15s}
.role-opt.active{background:var(--surface);color:var(--blue);box-shadow:0 1px 4px rgba(16,24,40,.12)}
.login-btn{margin-top:8px;padding:12px;font-size:15px;letter-spacing:4px;border-radius:11px}
.login-form .text-btn{margin:10px auto 0;font-size:12.5px}
.login-tip{margin-top:16px;text-align:center;font-size:11.5px;color:var(--ink-3)}
.login-footer{position:relative;font-size:12px;color:var(--ink-3);letter-spacing:1px}
.login-error{color:var(--red);font-size:12.5px;margin:-6px 0 8px;min-height:18px}

/* ═══════════ 主布局 ═══════════ */
.app{display:grid;grid-template-columns:308px minmax(0,1fr) 408px;gap:12px;height:100vh;padding:12px}
.app.dir-hidden{grid-template-columns:minmax(0,1fr) 408px}
.app.dir-hidden .left-panel{display:none}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);display:flex;flex-direction:column;min-height:0;overflow:hidden;animation:panelIn .5s cubic-bezier(.2,.9,.3,1) both}
.center-panel{animation-delay:.06s}.right-panel{animation-delay:.12s}
@keyframes panelIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:13px 16px;border-bottom:1px solid var(--line);flex:none;flex-wrap:wrap}
.panel-title{display:flex;align-items:center;gap:8px;font-size:15.5px;font-weight:800;letter-spacing:.5px}
.panel-title.sm{font-size:14px}
.pt-ico{width:26px;height:26px;border-radius:8px;display:flex;align-items:center;justify-content:center;flex:none}
.pt-ico svg{width:15px;height:15px}
.pt-ico.blue{background:var(--blue-soft);color:var(--blue)}
.pt-ico.violet{background:#f1eaff;color:var(--violet)}
.pt-ico.cyan{background:#e0f5f8;color:var(--cyan)}
.pt-ico.dark{background:#e8ecf3;color:#33415c}
.head-actions{display:flex;align-items:center;gap:7px;flex-wrap:wrap}

/* ── 课程树 ── */
.tree-view{display:flex;flex-direction:column;min-height:0;flex:1}
.tree-search{display:flex;align-items:center;gap:8px;margin:12px 14px 8px;padding:8px 12px;background:var(--surface-2);border:1.5px solid var(--line);border-radius:10px;color:var(--ink-3);transition:border .15s}
.tree-search:focus-within{border-color:var(--blue-border);background:#fff}
.tree-search svg{width:15px;height:15px;flex:none}
.tree-search input{border:none;background:none;outline:none;flex:1;font-size:13px;color:var(--ink)}
.course-tree{flex:1;overflow-y:auto;padding:4px 10px 12px}
.tree-node{user-select:none}
.tree-row{display:flex;align-items:center;gap:7px;padding:8px 10px;border-radius:9px;cursor:pointer;font-size:13.5px;color:var(--ink);transition:background .13s;position:relative}
.tree-row:hover{background:var(--surface-2)}
.tree-row .chev{width:14px;height:14px;flex:none;color:var(--ink-3);transition:transform .2s}
.tree-node.open>.tree-row .chev{transform:rotate(180deg)}
.tree-row .node-ico{width:16px;height:16px;flex:none;display:flex;align-items:center;justify-content:center}
.tree-row .node-ico svg{width:15px;height:15px}
.tree-row.collection{font-weight:700}
.tree-row.collection .node-ico{color:var(--blue)}
.tree-row.unit{font-weight:600;color:var(--ink-2)}
.tree-row.unit .node-ico{color:var(--amber)}
.tree-row.task{color:var(--ink-2)}
.tree-row.task .node-ico{color:var(--violet)}
.tree-row.task.active{background:var(--blue-soft);color:var(--blue-deep);font-weight:700}
.tree-row.task.active::before{content:"";position:absolute;left:0;top:20%;bottom:20%;width:3px;border-radius:3px;background:var(--blue)}
.tree-row .node-label{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.tree-children{overflow:hidden;display:grid;grid-template-rows:0fr;transition:grid-template-rows .24s ease}
.tree-node.open>.tree-children{grid-template-rows:1fr}
.tree-children>div{min-height:0;overflow:hidden}
.tree-children .tree-row{padding-left:26px}
.tree-children .tree-children .tree-row{padding-left:42px}
.task-done{flex:none;width:16px;height:16px;border-radius:50%;background:var(--green-soft);color:var(--green);display:flex;align-items:center;justify-content:center;font-size:10px;font-weight:800}
.tree-empty{padding:28px 16px;text-align:center;color:var(--ink-3);font-size:13px}
.tree-foot{flex:none;padding:8px 16px;border-top:1px solid var(--line);font-size:11.5px;color:var(--ink-3)}
.tree-mark{background:#fff3bf;border-radius:3px;padding:0 1px}

/* ── 任务视图 ── */
.task-view{flex:1;overflow-y:auto;padding:16px 18px 24px;animation:fadeSlide .3s ease both}
@keyframes fadeSlide{from{opacity:0;transform:translateX(-8px)}to{opacity:1;transform:none}}
.task-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:8px}
.task-path{font-size:11.5px;color:var(--ink-3);background:var(--surface-2);border:1px solid var(--line);padding:3px 9px;border-radius:20px}
.done-badge{font-size:11.5px;font-weight:700;color:var(--green);background:var(--green-soft);border:1px solid #bfe6cd;padding:3px 9px;border-radius:20px}
.task-title{font-size:17px;font-weight:800;margin-bottom:10px;line-height:1.4}
.task-desc{font-size:13.5px;color:var(--ink);line-height:1.85}
.task-desc p{margin-bottom:8px}
.task-desc b,.task-desc strong{color:var(--blue-deep)}
.task-desc table{border-collapse:collapse;width:100%;margin:10px 0;font-size:12.5px}
.task-desc th,.task-desc td{border:1px solid var(--line-2);padding:6px 9px;text-align:center}
.task-desc th{background:var(--blue-soft);color:var(--blue-deep);font-weight:700}
.task-desc td{background:var(--surface-2)}
.task-desc code{font-family:var(--font-mono);font-size:12px;background:#f1eaff;color:var(--violet);padding:1px 6px;border-radius:5px}
.task-desc .formula{display:block;background:var(--surface-2);border:1px dashed var(--line-2);border-radius:8px;padding:8px 12px;margin:8px 0;font-family:var(--font-mono);font-size:12.5px;color:var(--ink-2)}
.task-hints{margin-top:18px;border:1px solid var(--line);border-radius:11px;overflow:hidden}
.hints-toggle{width:100%;display:flex;align-items:center;gap:8px;padding:10px 13px;background:var(--surface-2);border:none;font-size:13px;font-weight:700;color:var(--ink-2)}
.hints-toggle svg{width:15px;height:15px;color:var(--amber)}
.hints-toggle .chev{margin-left:auto;color:var(--ink-3);transition:transform .2s}
.hints-toggle.open .chev{transform:rotate(180deg)}
.hints-toggle span{font-size:11px;color:var(--ink-3);font-weight:500}
.hints-list{padding:10px 14px 12px 30px;font-size:13px;color:var(--ink-2);display:flex;flex-direction:column;gap:6px}
.hints-list li::marker{color:var(--amber);font-weight:700}

/* ── 编辑器 ── */
.editor-wrap{flex:1;min-height:140px;display:flex;margin:12px 16px 0;border:1px solid var(--line-2);border-radius:11px;overflow:hidden;background:#fff;position:relative}
.editor-wrap:focus-within{border-color:var(--blue-border);box-shadow:0 0 0 3px rgba(26,109,255,.09)}
.gutter{flex:none;width:46px;background:var(--surface-2);border-right:1px solid var(--line);color:#a5aebd;font-family:var(--font-mono);font-size:var(--code-size);line-height:var(--code-lh);text-align:right;padding:10px 9px 10px 0;overflow:hidden;user-select:none}
.gutter .gl{height:var(--code-lh)}
.gutter .gl.cur{color:var(--blue);font-weight:700}
.code-area{position:relative;flex:1;min-width:0;overflow:hidden}
.highlight,.code-input{font-family:var(--font-mono);font-size:var(--code-size);line-height:var(--code-lh);tab-size:4;white-space:pre;padding:10px 14px;margin:0;border:none;letter-spacing:0}
.highlight{position:absolute;inset:0;overflow:hidden;color:var(--code-ink);pointer-events:none}
.code-input{position:absolute;inset:0;width:100%;height:100%;resize:none;background:transparent;color:transparent;caret-color:var(--ink);outline:none;overflow:auto;-webkit-text-fill-color:transparent}
.code-input::selection{background:rgba(26,109,255,.22)}
.line-highlight{position:absolute;left:0;right:0;height:var(--code-lh);background:rgba(26,109,255,.06);pointer-events:none;transition:top .06s linear}
.tok-k{color:var(--code-key);font-weight:600}
.tok-s{color:var(--code-str)}
.tok-n{color:var(--code-num)}
.tok-c{color:var(--code-com);font-style:italic}
.tok-b{color:var(--code-builtin)}
.tok-f{color:var(--code-builtin);font-weight:600}
.tok-o{color:#0184bc}
.tok-blank{background:#fff3bf;border-bottom:2px solid #f0b429;border-radius:3px;color:#92600a;font-weight:700}
.save-status{font-size:11.5px;color:var(--ink-3);transition:opacity .3s}
.save-status.ok{color:var(--green)}

/* ── 运行按钮栏 ── */
.run-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;padding:12px 16px;flex:none}
.action-btn{padding:9px 8px;font-size:13.5px}
.action-btn.running{border-color:var(--amber);color:var(--amber);background:#fff8eb}
.spin{width:13px;height:13px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;animation:spin .7s linear infinite;flex:none}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── 终端 ── */
.terminal-head{display:flex;align-items:center;gap:10px;padding:2px 16px 8px;flex:none}
.terminal-head .panel-title{margin-right:auto}
.py-status{display:inline-flex;align-items:center;gap:6px;font-size:11.5px;color:var(--ink-3)}
.py-status .dot{width:7px;height:7px;border-radius:50%;background:var(--amber);animation:pulse 1.2s ease infinite}
.py-status.ready .dot{background:var(--green);animation:none}
.py-status.ready{color:var(--green)}
.py-status.error .dot{background:var(--red);animation:none}
.py-status.error{color:var(--red)}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
.input-panel{flex:none;margin:0 16px 8px;border:1px solid var(--blue-border);background:linear-gradient(135deg,#f4f8ff,#eef4ff);border-radius:11px;padding:10px 13px;animation:fadeSlide .25s ease both}
.input-panel-title{display:flex;align-items:center;gap:7px;font-size:12.5px;font-weight:700;color:var(--blue-deep);margin-bottom:8px}
.input-panel-title svg{width:14px;height:14px}
.ip-tip{font-weight:400;font-size:11px;color:var(--ink-3)}
.input-fields{display:flex;flex-wrap:wrap;gap:8px}
.input-item{display:flex;align-items:center;gap:6px;flex:1;min-width:180px}
.input-item label{font-size:12px;color:var(--ink-2);white-space:nowrap;max-width:45%;overflow:hidden;text-overflow:ellipsis}
.input-item input{flex:1;min-width:60px;padding:6px 10px;border:1.5px solid var(--blue-border);border-radius:8px;font-size:13px;font-family:var(--font-mono);background:#fff}
.input-item input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(26,109,255,.13)}
.terminal{flex:none;height:196px;margin:0 16px 14px;background:var(--term-bg);border-radius:11px;padding:12px 14px;overflow-y:auto;font-family:var(--font-mono);font-size:12.8px;line-height:1.7;color:var(--term-ink);box-shadow:inset 0 2px 10px rgba(0,0,0,.4)}
.term-line{white-space:pre-wrap;word-break:break-all;animation:termIn .18s ease both}
@keyframes termIn{from{opacity:0;transform:translateY(3px)}to{opacity:1;transform:none}}
.term-sys{color:var(--term-dim);font-style:italic}
.term-out{color:var(--term-ink)}
.term-err{color:var(--term-red)}
.term-ok{color:var(--term-green)}
.term-input{color:var(--term-cyan)}
.term-warn{color:var(--term-amber)}
.term-banner{display:inline-block;padding:1px 9px;border-radius:5px;font-weight:700;font-size:11.5px;margin-right:6px}
.term-banner.ok{background:rgba(74,222,128,.15);color:var(--term-green)}
.term-banner.err{background:rgba(255,123,114,.15);color:var(--term-red)}

/* ── 聊天助手 ── */
.engine-badge{font-size:10.5px;font-weight:700;color:var(--cyan);background:#e0f5f8;border:1px solid #b5e5ec;padding:2px 8px;border-radius:20px;white-space:nowrap}
.engine-badge.api{color:var(--violet);background:#f1eaff;border-color:#ddc9ff}
.chat-list{flex:1;min-height:0;overflow-y:auto;background:var(--chat-bg);margin:12px 14px 0;border-radius:12px;padding:16px 14px;display:flex;flex-direction:column;gap:14px;scroll-behavior:smooth}
.msg{display:flex;gap:9px;max-width:100%;animation:msgIn .3s cubic-bezier(.2,.9,.3,1) both}
@keyframes msgIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.msg.user{flex-direction:row-reverse}
.avatar{flex:none;width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:800;color:#fff;box-shadow:0 2px 6px rgba(16,24,40,.18)}
.msg.ai .avatar{background:linear-gradient(135deg,#2f7dff,#0e9bd8)}
.msg.user .avatar{background:linear-gradient(135deg,#f59e0b,#f97316)}
.bubble{max-width:calc(100% - 44px);background:#fff;border-radius:13px;padding:10px 13px;font-size:13.2px;line-height:1.75;box-shadow:0 1px 3px rgba(16,24,40,.08);overflow-wrap:break-word;min-width:0}
.msg.user .bubble{background:linear-gradient(135deg,#2f7dff,#1a6dff);color:#fff;border-bottom-right-radius:4px}
.msg.ai .bubble{border-bottom-left-radius:4px}
.bubble p{margin-bottom:6px}
.bubble p:last-child{margin-bottom:0}
.bubble ol,.bubble ul{padding-left:20px;margin:6px 0;display:flex;flex-direction:column;gap:3px}
.bubble li::marker{color:var(--blue);font-weight:700}
.bubble code{font-family:var(--font-mono);font-size:11.8px;background:#f1f3f8;color:#c7254e;padding:1px 5px;border-radius:4px}
.bubble pre{background:#0f172a;color:#dbe4f0;border-radius:9px;padding:10px 12px;margin:8px 0;overflow-x:auto;font-family:var(--font-mono);font-size:11.8px;line-height:1.65}
.bubble pre code{background:none;color:inherit;padding:0}
.bubble pre::-webkit-scrollbar-thumb{background:#33415c;border:2px solid transparent;background-clip:content-box}
.bubble pre::-webkit-scrollbar-thumb:hover{background:#46587a;border:2px solid transparent;background-clip:content-box}
.bubble b,.bubble strong{color:var(--blue-deep)}
.msg.user .bubble b,.msg.user .bubble strong{color:#fff}
.bubble .md-h{display:block;font-weight:800;color:var(--ink);margin:8px 0 4px;font-size:13.5px}
.bubble .stat-bars{display:flex;flex-direction:column;gap:7px;margin:8px 0}
.stat-bar-row{display:grid;grid-template-columns:86px 1fr 34px;align-items:center;gap:8px;font-size:12px}
.stat-bar-track{height:8px;background:#edf1f7;border-radius:6px;overflow:hidden}
.stat-bar-fill{height:100%;border-radius:6px;background:linear-gradient(90deg,#2f7dff,#0e9bd8);animation:barGrow .8s cubic-bezier(.2,.9,.3,1) both}
.stat-bar-fill.g{background:linear-gradient(90deg,#22c55e,#4ade80)}
.stat-bar-fill.r{background:linear-gradient(90deg,#ef4444,#f87171)}
.stat-bar-fill.a{background:linear-gradient(90deg,#f59e0b,#fbbf24)}
.stat-bar-fill.v{background:linear-gradient(90deg,#8b5cf6,#a78bfa)}
@keyframes barGrow{from{width:0!important}}
.typing{display:inline-flex;gap:4px;padding:4px 2px}
.typing i{width:6px;height:6px;border-radius:50%;background:#9fb0c8;animation:tp 1.1s ease infinite}
.typing i:nth-child(2){animation-delay:.18s}.typing i:nth-child(3){animation-delay:.36s}
@keyframes tp{0%,100%{transform:translateY(0);opacity:.4}45%{transform:translateY(-4px);opacity:1}}
.quick-actions{flex:none;display:grid;grid-template-columns:repeat(3,1fr);gap:7px;padding:11px 14px 8px}
.qa-btn{display:inline-flex;align-items:center;justify-content:center;gap:5px;padding:7px 4px;border:1px solid var(--blue-border);background:#fff;color:var(--blue);border-radius:9px;font-size:12.3px;font-weight:600;transition:all .15s}
.qa-btn svg{width:13px;height:13px;flex:none}
.qa-btn:hover{background:var(--blue-soft);border-color:var(--blue);transform:translateY(-1px);box-shadow:0 3px 9px rgba(26,109,255,.15)}
.qa-btn:active{transform:scale(.96)}
.qa-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.qa-btn.wide{grid-column:span 3}
.chat-input{flex:none;position:relative;margin:0 14px 14px;background:var(--surface-2);border:1.5px solid var(--line);border-radius:12px;padding:10px 12px;transition:border .15s}
.chat-input:focus-within{border-color:var(--blue-border);background:#fff}
.chat-input textarea{width:100%;border:none;background:none;outline:none;resize:none;font-size:13px;line-height:1.6;color:var(--ink);max-height:96px}
.chat-input textarea::placeholder{color:#a3adbd;font-size:12px}
.send-btn{position:absolute;right:9px;bottom:9px;padding:6px 16px;font-size:13px}

/* ── 浮动按钮 ── */
.float-btn{position:fixed;z-index:40;display:flex;align-items:center;gap:7px;padding:10px 15px;border-radius:30px;border:1px solid var(--blue-border);background:#fff;color:var(--blue);font-size:13px;font-weight:700;box-shadow:var(--shadow-pop);transition:all .18s}
.float-btn svg{width:16px;height:16px}
.float-btn:hover{transform:translateY(-2px);background:var(--blue-soft)}
.float-btn.left{left:16px;top:16px}
.float-btn.right{right:16px;bottom:16px}

/* ── 模态框 ── */
.modal-overlay{position:fixed;inset:0;z-index:100;background:rgba(15,23,42,.45);backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;padding:20px;animation:ovIn .2s ease both}
@keyframes ovIn{from{opacity:0}}
.modal{background:#fff;border-radius:16px;box-shadow:var(--shadow-pop);display:flex;flex-direction:column;max-height:92vh;animation:modalIn .28s cubic-bezier(.2,.9,.3,1) both;overflow:hidden}
@keyframes modalIn{from{opacity:0;transform:translateY(20px) scale(.97)}to{opacity:1;transform:none}}
.modal.sm{width:min(400px,94vw)}
.modal.md{width:min(560px,94vw)}
.modal.lg{width:min(1060px,96vw);height:min(720px,92vh)}
.modal-head{display:flex;align-items:center;gap:14px;padding:15px 20px;border-bottom:1px solid var(--line);flex:none}
.modal-head h3{font-size:16px;font-weight:800;margin-right:auto}
.modal-x{flex:none}
.modal-foot{display:flex;justify-content:flex-end;gap:9px;padding:14px 20px;border-top:1px solid var(--line);flex:none}
.confirm-msg{padding:20px;font-size:13.8px;color:var(--ink-2);line-height:1.8}
.tabs{display:flex;gap:4px;background:var(--surface-2);border-radius:10px;padding:3px}
.tab{border:none;background:none;padding:6px 16px;border-radius:8px;font-size:13px;font-weight:600;color:var(--ink-2);transition:all .15s}
.tab.active{background:#fff;color:var(--blue);box-shadow:0 1px 4px rgba(16,24,40,.12)}
.tab-body{flex:1;min-height:0;display:flex;flex-direction:column;overflow:hidden}

/* 课程管理 */
.course-manage{flex:1;display:grid;grid-template-columns:288px 1fr;min-height:0}
.manage-tree{border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.manage-tree-head{display:flex;align-items:center;justify-content:space-between;padding:11px 14px;border-bottom:1px solid var(--line);font-size:13px;font-weight:700;color:var(--ink-2)}
.manage-tree-body{flex:1;overflow-y:auto;padding:8px}
.mt-row{display:flex;align-items:center;gap:6px;padding:7px 9px;border-radius:8px;cursor:pointer;font-size:12.8px;transition:background .13s}
.mt-row:hover{background:var(--surface-2)}
.mt-row.sel{background:var(--blue-soft);color:var(--blue-deep);font-weight:700}
.mt-row .mt-label{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mt-row.lv1{font-weight:700}
.mt-row.lv2{padding-left:22px;color:var(--ink-2)}
.mt-row.lv3{padding-left:38px;color:var(--ink-2)}
.mt-add{flex:none;border:none;background:none;color:var(--blue);font-size:11px;font-weight:700;padding:2px 6px;border-radius:5px;opacity:0;transition:opacity .13s}
.mt-row:hover .mt-add{opacity:1}
.mt-add:hover{background:var(--blue-soft)}
.manage-io{display:flex;gap:6px;padding:9px 12px;border-bottom:1px solid var(--line);background:var(--surface-2);flex-wrap:wrap}
.manage-io .btn{flex:1;padding:5px 6px;font-size:11.8px;gap:4px}
.manage-io .btn svg{width:14px;height:14px;flex:none}
.import-body{flex:1;overflow-y:auto;padding:16px 20px;display:flex;flex-direction:column;gap:12px;min-height:0}
.import-summary{display:flex;gap:8px;flex-wrap:wrap}
.import-errors{background:var(--red-soft);border:1px solid var(--red-border);border-radius:10px;padding:10px 14px;font-size:12.5px;color:var(--red-deep);line-height:1.8}
.import-errors b{display:block;margin-bottom:2px}
.import-errors ul{margin:0;padding-left:18px}
.import-table-wrap{border:1px solid var(--line);border-radius:10px;overflow:auto;max-height:340px}
.import-table-wrap .data-table{min-width:640px}
.import-note{font-size:12px;color:var(--ink-3);line-height:1.7;margin:0}
.import-note b{color:var(--ink-2)}
.imp-tag{font-size:11px;font-weight:700;padding:2px 9px;border-radius:12px}
.imp-tag.new{background:var(--green-soft);color:var(--green)}
.imp-tag.upd{background:#fff4e0;color:var(--amber)}
.manage-form{overflow-y:auto;padding:18px 22px}
.manage-empty{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;color:var(--ink-3);text-align:center;font-size:13px;line-height:1.9}
.manage-empty svg{width:44px;height:44px;opacity:.4}
.mf-title{font-size:15px;font-weight:800;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.mf-title .mf-kind{font-size:10.5px;font-weight:700;color:var(--violet);background:#f1eaff;padding:2px 8px;border-radius:12px}
.manage-form .field textarea{resize:vertical;line-height:1.7}
.manage-form .field textarea.mono{font-family:var(--font-mono);font-size:12.5px;background:#fbfcfe}
.mf-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}
.mf-actions{display:flex;gap:9px;margin-top:6px;padding-top:14px;border-top:1px solid var(--line)}
.mf-actions .spacer{flex:1}
.test-row{display:grid;grid-template-columns:1fr 1.4fr 92px 30px;gap:7px;margin-bottom:7px;align-items:center}
.test-row input,.test-row select{padding:7px 9px;border:1.5px solid var(--line-2);border-radius:8px;font-size:12.3px;font-family:var(--font-mono);width:100%}
.test-row select{font-family:var(--font-ui)}
.test-del{border:none;background:none;color:var(--red);font-size:16px;border-radius:6px;width:28px;height:28px}
.test-del:hover{background:var(--red-soft)}
.mf-label{font-size:12.5px;font-weight:600;color:var(--ink-2);margin:10px 0 6px;display:flex;align-items:center;gap:8px}
.mf-label .btn{margin-left:auto}

/* 数据埋点 */
.data-toolbar{display:flex;align-items:center;gap:8px;padding:12px 18px;border-bottom:1px solid var(--line);flex:none;flex-wrap:wrap}
.select{padding:6px 10px;border:1.5px solid var(--line-2);border-radius:8px;font-size:12.5px;background:#fff;color:var(--ink);max-width:180px}
.data-count{font-size:12px;color:var(--ink-3)}
.spacer{flex:1}
.data-stats{display:flex;gap:8px;padding:10px 18px 0;flex:none;flex-wrap:wrap}
.stat-chip{display:inline-flex;align-items:center;gap:6px;font-size:11.8px;font-weight:600;padding:4px 11px;border-radius:20px;background:var(--surface-2);border:1px solid var(--line);color:var(--ink-2)}
.stat-chip b{font-size:13px;color:var(--blue-deep)}
.stat-chip.g b{color:var(--green)}.stat-chip.r b{color:var(--red)}.stat-chip.a b{color:var(--amber)}.stat-chip.v b{color:var(--violet)}
.data-table-wrap{flex:1;overflow:auto;margin:10px 18px 14px;border:1px solid var(--line);border-radius:11px}
.data-table{width:100%;border-collapse:collapse;font-size:12.3px}
.data-table th{position:sticky;top:0;background:var(--surface-2);color:var(--ink-2);font-weight:700;text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);white-space:nowrap;z-index:2}
.data-table td{padding:8px 10px;border-bottom:1px solid var(--line);color:var(--ink);vertical-align:middle}
.data-table tbody tr{cursor:pointer;transition:background .12s}
.data-table tbody tr:hover{background:var(--blue-soft)}
.data-table .col-check{width:34px}
.data-table input[type=checkbox]{width:14px;height:14px;accent-color:var(--blue);cursor:pointer}
.type-tag{display:inline-block;font-size:11px;font-weight:700;padding:2px 8px;border-radius:12px;white-space:nowrap}
.type-tag.t0{background:#e8ecf3;color:#33415c}
.type-tag.t1,.type-tag.t7ok{background:var(--green-soft);color:var(--green)}
.type-tag.t2,.type-tag.t7no{background:var(--red-soft);color:var(--red)}
.type-tag.t3,.type-tag.t4{background:var(--blue-soft);color:var(--blue-deep)}
.type-tag.t5{background:#e0f5f8;color:var(--cyan)}
.type-tag.t6{background:#fff4e0;color:var(--amber)}
.type-tag.t8,.type-tag.t9,.type-tag.t10{background:#f1eaff;color:var(--violet)}
.result-ok{color:var(--green);font-weight:700}
.result-no{color:var(--red);font-weight:700}
.data-bulk{display:flex;align-items:center;gap:9px;padding:0 18px 14px;font-size:12.5px;color:var(--ink-2)}
.data-empty{padding:40px;text-align:center;color:var(--ink-3)}

/* 助手设置 */
.settings-body{padding:18px 20px;overflow-y:auto}
.engine-opts{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:16px}
.engine-opt{position:relative;border:1.5px solid var(--line-2);border-radius:12px;padding:13px 14px;cursor:pointer;transition:all .15s;display:block}
.engine-opt input{position:absolute;opacity:0}
.engine-opt b{display:block;font-size:13.5px;margin-bottom:3px}
.engine-opt i{display:block;font-style:normal;font-size:11.5px;color:var(--ink-3);line-height:1.6}
.engine-opt.active{border-color:var(--blue);background:var(--blue-soft);box-shadow:0 0 0 3px rgba(26,109,255,.1)}
.api-fields .field{margin-bottom:12px}
.api-row{display:flex;align-items:center;gap:10px;margin:4px 0 10px}
.api-test-result{font-size:12px}
.api-test-result.ok{color:var(--green)}.api-test-result.no{color:var(--red)}
.api-note{font-size:11.5px;color:var(--ink-3);line-height:1.7;background:var(--surface-2);border-radius:9px;padding:9px 12px}

/* 记录详情 */
.record-body{padding:18px 20px;overflow-y:auto;font-size:13px}
.record-body .rb-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px 16px;margin-bottom:14px}
.record-body .rb-item{background:var(--surface-2);border-radius:9px;padding:8px 12px}
.record-body .rb-item b{display:block;font-size:11px;color:var(--ink-3);font-weight:600;margin-bottom:2px}
.record-body pre{background:#0f172a;color:#dbe4f0;border-radius:10px;padding:12px 14px;font-family:var(--font-mono);font-size:12px;line-height:1.7;overflow-x:auto;white-space:pre-wrap;word-break:break-all;margin:6px 0 12px}
.record-body .rb-label{font-size:12px;font-weight:700;color:var(--ink-2);margin-top:10px}

/* ── Toast ── */
.toast-wrap{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);z-index:200;display:flex;flex-direction:column;align-items:center;gap:8px;pointer-events:none}
.toast{pointer-events:auto;display:flex;align-items:center;gap:10px;background:#1f2733;color:#fff;padding:10px 18px;border-radius:12px;font-size:13px;box-shadow:var(--shadow-pop);animation:toastIn .3s cubic-bezier(.2,.9,.3,1) both;max-width:88vw}
.toast.out{animation:toastOut .25s ease both}
@keyframes toastIn{from{opacity:0;transform:translateY(16px) scale(.95)}to{opacity:1;transform:none}}
@keyframes toastOut{to{opacity:0;transform:translateY(10px) scale(.96)}}
.toast .t-ico{width:18px;height:18px;flex:none;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:800}
.toast.ok .t-ico{background:var(--green)}.toast.err .t-ico{background:var(--red)}.toast.info .t-ico{background:var(--blue)}
.toast .t-action{border:none;background:rgba(255,255,255,.16);color:#8ec5ff;font-weight:700;font-size:12.5px;padding:4px 12px;border-radius:8px;margin-left:4px}
.toast .t-action:hover{background:rgba(255,255,255,.26)}

/* ═══════════ 响应式 ═══════════ */
@media (max-width:1280px){
  .app{grid-template-columns:270px minmax(0,1fr) 360px}
  .app.dir-hidden{grid-template-columns:minmax(0,1fr) 360px}
}
@media (max-width:1080px){
  .app{grid-template-columns:270px minmax(0,1fr)}
  .app.dir-hidden{grid-template-columns:minmax(0,1fr)}
  .right-panel{position:fixed;right:12px;top:12px;bottom:12px;width:min(400px,92vw);z-index:50;transform:translateX(calc(100% + 20px));transition:transform .28s cubic-bezier(.2,.9,.3,1);animation:none;box-shadow:var(--shadow-pop)}
  .right-panel.open{transform:none}
  .float-btn.right{display:flex}
}
@media (max-width:760px){
  .app{grid-template-columns:minmax(0,1fr);padding:8px;gap:8px}
  .left-panel{position:fixed;left:8px;top:8px;bottom:8px;width:min(320px,90vw);z-index:50;transform:translateX(calc(-100% - 16px));transition:transform .28s cubic-bezier(.2,.9,.3,1);animation:none;box-shadow:var(--shadow-pop)}
  .left-panel.open{transform:none}
  .app.dir-hidden .left-panel{display:flex}
  .float-btn.left{display:flex}
  .run-bar{grid-template-columns:repeat(2,1fr)}
  .terminal{height:160px}
  .login-card{grid-template-columns:1fr}
  .login-brand{padding:28px 26px}
  .brand-code{display:none}
  .login-form{padding:30px 26px}
  .panel-head{padding:11px 12px}
  .quick-actions{grid-template-columns:repeat(2,1fr)}
  .qa-btn.wide{grid-column:span 2}
  .course-manage{grid-template-columns:1fr}
  .manage-tree{max-height:200px;border-right:none;border-bottom:1px solid var(--line)}
  .mf-grid{grid-template-columns:1fr}
  .engine-opts{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
}