/* ============ 农智通 AI实验平台 全局样式 ============ */
:root {
  --green: #2e8b57; --green-d: #1f6b40; --green-l: #e8f5ee;
  --bg: #f4f7f5; --panel: #ffffff; --line: #e2e8e4;
  --ink: #23352c; --muted: #7c8f84; --accent: #e63946; --amber: #f4a261;
  --blue: #2a6f97; --radius: 10px;
  --shadow: 0 2px 10px rgba(30, 70, 50, .08);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
/* 关键：保证 HTML 的 hidden 属性永远生效（否则会被下方 #modal-mask/#code-panel 的 display 覆盖，
   导致弹窗/代码面板初始就显示且无法关闭，页面看起来卡死） */
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  background: var(--bg); color: var(--ink); font-size: 14px;
  display: flex; flex-direction: column; overflow: hidden;
}
button { font-family: inherit; cursor: pointer; border: none; border-radius: 8px; }
input, select, textarea { font-family: inherit; outline: none; }

/* ---------- 顶栏 ---------- */
#topbar {
  height: 56px; background: linear-gradient(90deg, #1f6b40, #2e8b57 60%, #3aa76d);
  display: flex; align-items: center; gap: 18px; padding: 0 18px; color: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,.15); z-index: 50;
}
.brand { font-size: 19px; font-weight: 700; letter-spacing: 1px; }
.brand small { font-size: 11px; font-weight: 400; opacity: .85; margin-left: 8px; }
#stage-control { display: flex; align-items: center; gap: 12px; flex: 1; justify-content: center; }
#stage-label { font-size: 13px; background: rgba(255,255,255,.18); padding: 5px 12px; border-radius: 20px; white-space: nowrap; }
#stage-slider { display: flex; background: rgba(255,255,255,.16); border-radius: 22px; padding: 3px; gap: 3px; }
.seg { padding: 6px 16px; border-radius: 18px; font-size: 12.5px; cursor: pointer; transition: all .2s; white-space: nowrap; }
.seg:hover { background: rgba(255,255,255,.15); }
.seg.active { background: #fff; color: var(--green-d); font-weight: 700; box-shadow: 0 1px 5px rgba(0,0,0,.25); }
.seg.locked { cursor: not-allowed; opacity: .7; }
.seg .lock { font-size: 10px; }
.top-actions { display: flex; align-items: center; gap: 10px; }
#btn-run { background: #ffd166; color: #3a2c00; font-weight: 700; font-size: 14px;
  padding: 9px 22px; border-radius: 22px; box-shadow: 0 2px 8px rgba(0,0,0,.2); }
#btn-run:hover { background: #ffd97e; }
#btn-run:disabled { background: #b9c4bd; color: #6c7a71; cursor: not-allowed; }
#btn-reset { background: rgba(255,255,255,.18); color: #fff; padding: 7px 14px; font-size: 12.5px; }
#user-chip { background: rgba(255,255,255,.18); padding: 6px 12px; border-radius: 20px; font-size: 12.5px; }
#btn-logout { background: rgba(0,0,0,.18); color: #fff; padding: 7px 14px; font-size: 12.5px; }

/* ---------- 主布局 ---------- */
#main { flex: 1; display: flex; min-height: 0; }
/* 三栏拖拽分隔条 */
.drag-handle {
  flex: 0 0 7px; cursor: col-resize; position: relative; z-index: 15;
  background: transparent; transition: background .15s;
}
.drag-handle::before {
  content: ''; position: absolute; left: 50%; top: 14px; bottom: 14px;
  width: 2.5px; background: #c9d8cf; border-radius: 3px; transform: translateX(-50%);
  transition: background .15s;
}
.drag-handle:hover::before, .drag-handle.active::before { background: var(--green); }
.drag-handle:hover, .drag-handle.active { background: rgba(46,139,87,.12); }
body.resizing { cursor: col-resize; user-select: none; }
body.resizing * { cursor: col-resize !important; }
#toolbox { width: 238px; background: var(--panel); border-right: 1px solid var(--line);
  overflow-y: auto; padding: 10px; flex-shrink: 0; }
.tb-title { font-size: 13px; font-weight: 700; color: var(--green-d); margin: 10px 4px 6px; display: flex; align-items: center; gap: 6px; }
.op-item { background: var(--green-l); border: 1px solid #cde7d8; border-radius: 8px;
  padding: 7px 9px; margin: 4px 0; font-size: 12.5px; cursor: grab;
  display: flex; align-items: center; gap: 8px; transition: all .15s; }
.op-item:hover { background: #dff1e6; transform: translateX(2px); }
.op-item:active { cursor: grabbing; }
.op-item .ico { font-size: 16px; }
.op-item .op-desc { color: var(--muted); font-size: 11px; margin-top: 2px; }
.op-cat { font-size: 12px; font-weight: 700; color: var(--ink); padding: 8px 6px 3px; cursor: pointer; display: flex; justify-content: space-between; }
.op-cat .arr { transition: transform .2s; }
.op-cat.open .arr { transform: rotate(90deg); }
.op-group { display: none; }
.op-group.open { display: block; }
.tpl-card { border: 1px dashed var(--green); border-radius: 10px; padding: 9px;
  margin: 6px 0; cursor: pointer; background: #fbfefc; transition: all .15s; }
.tpl-card:hover { background: var(--green-l); border-style: solid; }
.tpl-card .t { font-weight: 700; font-size: 12.5px; }
.tpl-card .s { font-size: 11px; color: var(--blue); margin: 2px 0; }
.tpl-card .d { font-size: 11px; color: var(--muted); }
.upload-box { border: 1px dashed #b7c9be; border-radius: 8px; padding: 10px; text-align: center; font-size: 12px; color: var(--muted); cursor: pointer; }
.upload-box:hover { border-color: var(--green); background: var(--green-l); }

/* ---------- 画布区 ---------- */
#center { flex: 1; display: flex; flex-direction: column; min-width: 0; position: relative; }
#canvas-wrap { flex: 1; position: relative; overflow: auto; background:
  radial-gradient(#dbe8df 1px, transparent 1px); background-size: 22px 22px; }
#canvas-zoom { position: absolute; top: 10px; right: 12px; z-index: 25; display: flex;
  align-items: center; gap: 2px; background: rgba(255,255,255,.94); border: 1px solid #d8e5dd;
  border-radius: 8px; padding: 3px 5px; box-shadow: var(--shadow); }
#canvas-zoom button { border: none; background: none; color: #2c5c45; font-size: 13px;
  width: 26px; height: 24px; line-height: 1; cursor: pointer; border-radius: 5px; }
#canvas-zoom button:hover { background: var(--green-l); }
#canvas-zoom #zoom-label { font-size: 11px; color: var(--muted); min-width: 34px; text-align: center; }
#canvas-zoom #zoom-fit { width: auto; padding: 0 7px; font-size: 11.5px; }
#edges-svg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 2; }
#canvas { position: absolute; inset: 0; z-index: 3; }
#canvas-empty { position: absolute; inset: 0; display: flex; flex-direction: column; gap: 8px;
  align-items: center; justify-content: center; color: #a9bcb0; font-size: 15px; z-index: 1; pointer-events: none; }
#demo-banner { position: absolute; top: 12px; left: 50%; transform: translateX(-50%);
  background: rgba(31,107,64,.92); color: #fff; padding: 8px 18px; border-radius: 20px;
  font-size: 12.5px; z-index: 20; box-shadow: var(--shadow); }

/* 算子节点 */
.node { position: absolute; width: 190px; background: #fff; border: 1.5px solid #cfe0d6;
  border-radius: 10px; box-shadow: var(--shadow); user-select: none; z-index: 5;
  transition: box-shadow .15s, border-color .15s; }
.node:hover { box-shadow: 0 4px 14px rgba(30,70,50,.16); }
.node.running { border-color: var(--amber); box-shadow: 0 0 0 3px rgba(244,162,97,.25); }
.node.done { border-color: var(--green); }
.node.error { border-color: var(--accent); }
.node.dragging { z-index: 30; opacity: .9; }
.node .n-head { display: flex; align-items: center; gap: 7px; padding: 7px 9px; cursor: move;
  background: var(--green-l); border-radius: 8px 8px 0 0; font-size: 13px; font-weight: 700; }
.node .n-head .ico { font-size: 15px; }
.node .n-del { margin-left: auto; border: none; background: none; color: #a9bcb0; font-size: 14px; padding: 0 2px; }
.node .n-del:hover { color: var(--accent); }
.node .n-body { padding: 5px 9px 7px; font-size: 11px; color: var(--muted); }
.node .ports { display: flex; justify-content: space-between; padding: 0 6px 7px; }
.port { position: relative; display: flex; align-items: center; gap: 5px; cursor: crosshair; }
.port .dot { width: 12px; height: 12px; border-radius: 50%; border: 2px solid #fff;
  background: var(--green); box-shadow: 0 0 0 1.5px var(--green); }
.port.in .dot { order: -1; }
.port .pname { font-size: 10.5px; color: var(--muted); }
.port:hover .dot { transform: scale(1.25); }
.node.locked .n-head, .node.locked .n-del { pointer-events: none; }
.node.locked { opacity: .96; }

/* 连线 */
.edge { stroke: #6f9e84; stroke-width: 2; fill: none; opacity: .85; }
.edge.temp { stroke-dasharray: 5 4; stroke: var(--blue); }
.edge.bad { stroke: var(--accent); }

/* 阶3 代码面板 */
#code-panel { height: 38%; min-height: 200px; border-top: 2px solid var(--green);
  display: flex; flex-direction: column; background: #1e2430; z-index: 10; }
.code-head { display: flex; align-items: center; gap: 10px; padding: 8px 12px;
  background: #273041; color: #cfd8e3; font-size: 12.5px; }
.code-head .sp { flex: 1; }
#code-editor { flex: 1; background: #171c26; color: #d6e4d0; border: none; resize: none;
  padding: 12px 14px; font-family: Consolas, "Courier New", monospace; font-size: 12.5px; line-height: 1.6; tab-size: 4; }
#btn-run-code { background: #3aa76d; color: #fff; padding: 6px 14px; font-size: 12.5px; }
#btn-gen-code { background: #eef3ef; color: #2e5a43; border: 1px solid #cfe0d6;
  padding: 6px 12px; font-size: 12px; transition: all .15s; }
#btn-gen-code:hover { background: #dff1e6; border-color: var(--green); }
#btn-gen-code:disabled { opacity: .55; cursor: wait; }

/* ---------- 右侧面板 ---------- */
#inspector { width: 330px; background: var(--panel); border-left: 1px solid var(--line);
  display: flex; flex-direction: column; flex-shrink: 0; }
.tabs { display: flex; border-bottom: 1px solid var(--line); }
.tabs button { flex: 1; background: none; padding: 11px 0; font-size: 13px; color: var(--muted); border-bottom: 2.5px solid transparent; }
.tabs button.active { color: var(--green-d); font-weight: 700; border-bottom-color: var(--green); }
.tab-pane { flex: 1; overflow-y: auto; padding: 10px; display: none; }
.tab-pane.active { display: block; }
.log-line { font-size: 12px; padding: 3.5px 8px; border-radius: 6px; margin: 2px 0; font-family: Consolas, monospace; }
.log-line.info { color: #43584c; background: #f2f7f4; }
.log-line.success { color: var(--green-d); background: var(--green-l); }
.log-line.model { color: #8a5a00; background: #fff6e5; }
.log-line.code { color: #2a4a75; background: #edf3fa; }
.log-line.error { color: #fff; background: var(--accent); }
.log-line .t { color: #a5b5ab; margin-right: 6px; }

.result-card { border: 1px solid var(--line); border-radius: 10px; margin-bottom: 10px; overflow: hidden; }
.result-card .rc-head { background: var(--green-l); padding: 7px 10px; font-weight: 700; font-size: 12.5px;
  display: flex; align-items: center; gap: 6px; }
.result-card .rc-head .sp { flex: 1; }
.result-card .rc-body { padding: 9px; }
.result-card img { max-width: 100%; border-radius: 6px; display: block; }
.result-card .rc-cap { font-size: 11px; color: var(--muted); margin-top: 5px; }
.result-card .rc-tbl { font-size: 11px; overflow-x: auto; }
.result-card .rc-tbl table { border-collapse: collapse; width: 100%; }
.result-card .rc-tbl th, .result-card .rc-tbl td { border: 1px solid var(--line); padding: 3px 6px; text-align: left; }
.result-card .rc-tbl th { background: #f2f7f4; }
.result-card .rc-text { font-size: 12.5px; white-space: pre-wrap; line-height: 1.7; }
.metric-badge { background: var(--green); color: #fff; font-size: 11px; padding: 2px 9px; border-radius: 12px; }
.rc-submit { margin-top: 8px; background: var(--blue); color: #fff; padding: 6px 14px; font-size: 12px; }
.rc-work { margin-top: 8px; margin-left: 8px; background: #fff0d4; color: #7a5200; padding: 6px 14px;
  font-size: 12px; border: 1px solid #f0d39a; }
.rc-work:hover { background: #ffe8bd; }
.rc-deploy { margin-top: 10px; background: var(--green); color: #fff; padding: 7px 14px;
  font-size: 12px; border-radius: 6px; }
.rc-deploy:hover { filter: brightness(1.06); }
.rc-copy { margin-top: 8px; background: var(--green-l); color: #2c5c45; padding: 6px 14px;
  font-size: 12px; border-radius: 6px; }

.tip-card { border-left: 4px solid var(--blue); background: #eef5fb; border-radius: 8px;
  padding: 9px 11px; margin: 8px 0; font-size: 12.5px; line-height: 1.75; }
.tip-card h4 { color: var(--blue); font-size: 13px; margin-bottom: 4px; }
.tip-card .sub { color: var(--muted); font-size: 11.5px; margin-top: 5px; }

/* ---------- 数据看板 ---------- */
.dash-head { margin-bottom: 6px; }
#dash-select { width: 100%; padding: 7px 10px; border: 1px solid #cfe0d6;
  border-radius: 8px; background: #fbfefc; font-size: 12.5px; }
.dash-hint { font-size: 11px; color: var(--muted); margin-top: 5px; }
.dash-empty { color: var(--muted); font-size: 12.5px; text-align: center;
  padding: 34px 12px; line-height: 1.8; }
.dash-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin-bottom: 10px; }
.dash-kpi { background: var(--green-l); border-radius: 10px; padding: 10px; text-align: center; }
.dash-kpi b { font-size: 19px; color: var(--green-d); display: block; }
.dash-kpi span { font-size: 11px; color: var(--muted); }
.dash-loading { text-align: center; color: var(--muted); padding: 30px 10px; font-size: 12.5px; }

/* ---------- 作业弹窗 ---------- */
#assign-mask { position: fixed; inset: 0; background: rgba(20,40,30,.45); z-index: 100;
  display: flex; align-items: center; justify-content: center; }
#assign-modal { background: #fff; border-radius: 14px; width: 560px; max-width: 92vw;
  max-height: 82vh; display: flex; flex-direction: column;
  box-shadow: 0 10px 40px rgba(0,0,0,.3); overflow: hidden; }
.am-head { display: flex; align-items: center; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.am-head h3 { font-size: 16px; flex: 1; }
#am-close { background: none; font-size: 15px; color: var(--muted); padding: 2px 6px; }
#am-close:hover { color: var(--accent); }
.am-tip { padding: 8px 18px; background: #eef5fb; color: #3a5871; font-size: 12px; line-height: 1.6; }
#assign-list { flex: 1; overflow-y: auto; padding: 12px 16px; }
.assign-card { border: 1px solid var(--line); border-radius: 10px; margin-bottom: 12px; overflow: hidden; }
.assign-card .a-head { display: flex; align-items: center; gap: 8px; padding: 10px 12px;
  background: var(--green-l); font-weight: 700; font-size: 13.5px; }
.assign-card .a-head .sp { flex: 1; }
.assign-card .a-body { padding: 10px 12px; font-size: 12.5px; line-height: 1.7; color: #43584c; }
.assign-card .a-meta { font-size: 11.5px; color: var(--muted); margin: 6px 0 0; }
.assign-card .a-meta b { color: #8a5a00; }
.badge.sub { background: var(--green); color: #fff; }
.badge.nosub { background: #eef0ee; color: #7c8f84; }
.a-submit { margin: 10px 12px 12px; }
.a-submit textarea { width: 100%; border: 1px solid #cfe0d6; border-radius: 8px;
  padding: 8px 10px; font-size: 12.5px; resize: vertical; min-height: 90px;
  font-family: inherit; line-height: 1.6; }
.a-submit .a-actions { display: flex; gap: 8px; margin-top: 8px; align-items: center; }
.a-submit .btn-ok { font-size: 12.5px; padding: 7px 18px; }
.a-submit .a-hint { font-size: 11px; color: var(--muted); flex: 1; }
.assign-empty { text-align: center; color: var(--muted); padding: 30px 10px; font-size: 12.5px; }

/* ---------- 弹窗 / 浮层 ---------- */
#modal-mask { position: fixed; inset: 0; background: rgba(20,40,30,.45); z-index: 100;
  display: flex; align-items: center; justify-content: center; }
#param-modal { background: #fff; border-radius: 14px; width: 430px; max-height: 78vh; overflow-y: auto;
  box-shadow: 0 10px 40px rgba(0,0,0,.3); padding: 18px 20px; }
#param-modal h3 { font-size: 16px; margin-bottom: 4px; display: flex; align-items: center; gap: 8px; }
#param-modal .p-desc { color: var(--muted); font-size: 12px; margin-bottom: 12px; }
.p-field { margin: 12px 0; }
.p-field label { display: block; font-size: 12.5px; font-weight: 700; margin-bottom: 5px; color: #33483d; }
.p-field select, .p-field input[type=text] { width: 100%; padding: 7px 10px; border: 1px solid #cfe0d6;
  border-radius: 8px; background: #fbfefc; font-size: 13px; }
.p-field input[type=range] { width: 100%; accent-color: var(--green); }
.p-field .range-row { display: flex; align-items: center; gap: 10px; }
.p-field .range-val { background: var(--green-l); color: var(--green-d); font-weight: 700;
  padding: 3px 10px; border-radius: 12px; min-width: 46px; text-align: center; font-size: 12.5px; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 16px; }
.btn-ok { background: var(--green); color: #fff; padding: 8px 22px; font-weight: 700; }
.btn-cancel { background: #e8efe9; color: #4a5d52; padding: 8px 18px; }

/* ---------- 参数对比实验（A/B） ---------- */
#cmp-mask { position: fixed; inset: 0; background: rgba(20,40,30,.45); z-index: 100;
  display: flex; align-items: center; justify-content: center; }
#cmp-box { background: #fff; border-radius: 14px; width: 720px; max-width: 94vw;
  max-height: 86vh; overflow-y: auto; box-shadow: 0 10px 40px rgba(0,0,0,.3); padding: 18px 20px; }
.cmp-head { display: flex; align-items: center; font-size: 16px; font-weight: 700; color: var(--green-d); }
.cmp-head button { margin-left: auto; background: none; color: var(--muted); font-size: 15px; padding: 2px 6px; }
.cmp-head button:hover { color: var(--accent); }
.cmp-desc { font-size: 12px; color: var(--muted); line-height: 1.75; margin: 6px 0 12px; }
.cmp-form { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; }
.cmp-form label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: #33483d; font-weight: 700; }
.cmp-form select, .cmp-form input { padding: 7px 10px; border: 1px solid #cfe0d6; border-radius: 8px;
  background: #fbfefc; font-size: 13px; width: 128px; }
#cmp-run { background: var(--green); color: #fff; font-weight: 700; padding: 8px 18px; font-size: 13px; }
#cmp-run:hover { background: var(--green-d); }
#cmp-run:disabled { background: #b9c4bd; cursor: wait; }
.cmp-status { font-size: 12px; color: #4a6357; margin-top: 10px; min-height: 16px; }
.cmp-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
.cmp-card { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: #fcfefd; }
.cmp-card-h { font-size: 12.5px; font-weight: 700; border-left: 3px solid; padding-left: 8px; line-height: 1.5; }
.cmp-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 5px; }
.cmp-acc { font-size: 26px; font-weight: 700; margin: 8px 0 2px; }
.cmp-acc small { display: block; font-size: 11px; font-weight: 400; color: var(--muted); margin-top: 1px; }
.cmp-curve { width: 100%; height: 96px; margin-top: 6px; background: #f7faf8; border-radius: 6px; }
.cmp-nocurve { font-size: 11.5px; color: var(--muted); padding: 22px 0; text-align: center; }
.cmp-meta { font-size: 11px; color: var(--muted); margin-top: 5px; min-height: 14px; }
.cmp-err { font-size: 11.5px; color: var(--accent); margin-top: 6px; line-height: 1.6; }
.cmp-verdict { grid-column: 1 / -1; background: #eef5fb; color: #3a5871; border-radius: 8px;
  padding: 10px 12px; font-size: 12px; line-height: 1.8; }

#toast { position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: #23352c; color: #fff; padding: 10px 22px; border-radius: 24px; font-size: 13px;
  opacity: 0; pointer-events: none; transition: all .25s; z-index: 200; box-shadow: 0 4px 16px rgba(0,0,0,.25); }
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
#toast.warn { background: #9c4a1f; }
#toast.ok { background: var(--green-d); }

#tip-banner { position: absolute; right: 14px; bottom: 14px; z-index: 40; display: none;
  background: var(--blue); color: #fff; border-radius: 22px; padding: 10px 16px; font-size: 12.5px;
  box-shadow: 0 4px 14px rgba(42,111,151,.4); cursor: pointer; animation: pulse 1.6s infinite; }
#tip-banner:hover { filter: brightness(1.1); }
@keyframes pulse { 0%,100% { box-shadow: 0 4px 14px rgba(42,111,151,.4);} 50% { box-shadow: 0 4px 22px rgba(42,111,151,.75);} }

/* ---------- 登录页 ---------- */
.login-body { background: linear-gradient(135deg, #e8f5ee, #d6e9dd 55%, #cfe4d6); display: flex; overflow: auto; }
.login-card { margin: auto; background: #fff; border-radius: 18px; padding: 34px 38px; width: 400px;
  box-shadow: 0 12px 44px rgba(30,80,50,.18); }
.login-card h1 { font-size: 22px; color: var(--green-d); margin-bottom: 4px; }
.login-card .sub { color: var(--muted); font-size: 12.5px; margin-bottom: 20px; }
.login-card label { font-size: 12.5px; font-weight: 700; display: block; margin: 12px 0 5px; }
.login-card input { width: 100%; padding: 10px 12px; border: 1.5px solid #cfe0d6; border-radius: 10px; font-size: 14px; }
.login-card input:focus { border-color: var(--green); }
#login-btn { width: 100%; margin-top: 20px; background: linear-gradient(90deg, var(--green-d), var(--green));
  color: #fff; font-size: 15px; font-weight: 700; padding: 11px 0; border-radius: 12px; }
#login-msg { color: var(--accent); font-size: 12.5px; margin-top: 10px; min-height: 18px; text-align: center; }
.demo-acc { margin-top: 18px; background: #f7faf8; border-radius: 10px; padding: 10px 12px; font-size: 12px; color: #5a6f63; line-height: 1.8; }
.demo-acc b { color: var(--green-d); }

/* ---------- 教师端 ---------- */
.teacher-body { overflow: auto; }
.teacher-body .t-header { background: linear-gradient(90deg, #1f3552, #2a6f97); color: #fff;
  padding: 18px 26px; display: flex; align-items: center; gap: 14px; }
.teacher-body .t-header .sp { flex: 1; }
.teacher-body .t-wrap { max-width: 1200px; margin: 18px auto; padding: 0 16px; }
.kpi-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin-bottom: 16px; }
.kpi { background: #fff; border-radius: 12px; padding: 14px 16px; box-shadow: var(--shadow); }
.kpi .k-num { font-size: 26px; font-weight: 800; color: var(--green-d); }
.kpi .k-label { font-size: 12px; color: var(--muted); margin-top: 2px; }
.kpi.warn .k-num { color: var(--accent); }
.grid-2 { display: grid; grid-template-columns: 2fr 1fr; gap: 14px; align-items: start; }
@media (max-width: 1000px) { .grid-2 { grid-template-columns: 1fr; } }
.t-card { background: #fff; border-radius: 12px; box-shadow: var(--shadow); margin-bottom: 14px; overflow: hidden; }
.t-card .t-c-head { padding: 12px 16px; font-weight: 700; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 8px; }
.major-filter { margin-left: auto; margin-right: 4px; padding: 4px 10px; border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink); font-size: 12px; font-weight: 600; cursor: pointer; outline: none; }
.major-filter:focus { border-color: var(--green-d); }
.t-card table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.t-card th, .t-card td { padding: 8px 10px; text-align: left; border-bottom: 1px solid #eef3ef; }
.t-card th { background: #f6faf7; color: #54685c; font-size: 12px; }
.badge { display: inline-block; padding: 2px 9px; border-radius: 12px; font-size: 11px; font-weight: 700; }
.badge.s1 { background: #e8efe9; color: #54685c; }
.badge.s2 { background: #e3f2e9; color: var(--green-d); }
.badge.s3 { background: #fff1d6; color: #8a5a00; }
.badge.alert { background: #fde3e5; color: var(--accent); }
.badge.ok { background: var(--green-l); color: var(--green-d); }
.alert-row { background: #fdf0f1; }
.t-bar { height: 8px; background: #edf2ee; border-radius: 6px; overflow: hidden; margin-top: 5px; }
.t-bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--green), #3aa76d); }
#assign-form { padding: 12px 16px; display: flex; flex-direction: column; gap: 8px; }
#assign-form input, #assign-form textarea { border: 1px solid #cfe0d6; border-radius: 8px; padding: 8px 10px; font-size: 13px; }
#assign-form button { background: var(--green); color: #fff; padding: 8px 0; font-weight: 700; }
.sub-item { border-bottom: 1px solid #eef3ef; padding: 10px 14px; font-size: 12.5px; }
.sub-item .sub-head { font-weight: 700; display: flex; align-items: center; gap: 8px; }
.sub-item .sub-meta { color: var(--muted); font-size: 11.5px; margin: 2px 0 6px; }
.sub-item pre { background: #f6faf7; border-radius: 8px; padding: 8px; font-size: 11px; white-space: pre-wrap; max-height: 140px; overflow-y: auto; }
.sub-detail { margin: 5px 0; background: #fbfdfc; border-radius: 6px; padding: 6px 8px; font-size: 12px; line-height: 1.6; }
.sub-preview { color: var(--blue); cursor: pointer; text-decoration: underline; }
#assign-form input[type=datetime-local] { width: 100%; }
.evt-line { font-size: 12px; padding: 6px 14px; border-bottom: 1px solid #f2f6f3; }
.evt-line .t { color: var(--muted); margin-right: 6px; }

/* ---------- AI 助教 ---------- */
#tutor-fab { position: fixed; right: 22px; bottom: 22px; z-index: 60;
  display: flex; align-items: center; gap: 6px; padding: 10px 16px; border-radius: 22px;
  background: var(--green); color: #fff; font-size: 15px;
  box-shadow: 0 8px 22px rgba(31, 107, 64, .3); }
#tutor-fab:hover { background: var(--green-d); }
#tutor-fab .tf-label { font-size: 13px; }
#tutor-panel { position: fixed; right: 22px; bottom: 78px; width: 366px;
  max-width: calc(100vw - 32px); height: 524px; max-height: calc(100vh - 120px);
  background: #fff; border: 1px solid #dfeae3; border-radius: 14px; z-index: 61;
  box-shadow: 0 18px 48px rgba(31, 70, 50, .24); display: flex; flex-direction: column;
  overflow: hidden; }
.tp-head { display: flex; justify-content: space-between; align-items: center;
  padding: 11px 14px; background: #f7fbf8; border-bottom: 1px solid #eaf1ec; }
.tp-name { font-size: 14px; font-weight: 700; color: var(--green-d); }
.tp-sub { font-weight: 400; font-size: 11px; color: var(--muted); margin-left: 6px; }
#tutor-close { background: none; font-size: 14px; color: var(--muted); padding: 2px 6px; }
#tutor-msgs { flex: 1; overflow-y: auto; padding: 12px 14px;
  display: flex; flex-direction: column; gap: 10px; background: #fbfdfb; }
.tp-msg { display: flex; }
.tp-msg.user { justify-content: flex-end; }
.tp-bubble { max-width: 86%; font-size: 12.5px; line-height: 1.8; padding: 9px 12px;
  border-radius: 10px; white-space: pre-wrap; word-break: break-word; }
.tp-msg.bot .tp-bubble { background: #fff; border: 1px solid #e2ede6; color: #33544a;
  border-top-left-radius: 3px; }
.tp-msg.user .tp-bubble { background: var(--green); color: #fff;
  border-top-right-radius: 3px; }
.tp-intent { display: inline-block; font-size: 10.5px; padding: 1px 7px;
  border-radius: 9px; background: var(--green-l); color: var(--green-d);
  margin-bottom: 4px; }
.tp-note { font-size: 10.5px; color: #8a6d3b; background: #fff8e6;
  border: 1px solid #f2e2b8; border-radius: 6px; padding: 3px 7px;
  margin-bottom: 5px; }
.tp-caret { display: inline-block; width: 6px; height: 12px; margin-left: 2px;
  background: var(--green); vertical-align: -1px;
  animation: tp-blink .9s steps(1) infinite; }
@keyframes tp-blink { 50% { opacity: 0; } }
.tp-follows { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 6px; }
.tp-follow { font-size: 11.5px; padding: 4px 9px; border-radius: 12px;
  border: 1px solid #cfe3d7; background: #f6fbf8; color: var(--green-d); }
.tp-follow:hover { background: #eaf5ef; }
/* 课程智能体：工具轨迹与出处 */
.tp-tools { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 6px; }
.tp-tool { font-size: 10.5px; padding: 2px 7px; border-radius: 9px;
  background: #eef7f2; color: var(--green-d); border: 1px solid #d6e9dd; }
.tp-cites { margin-top: 7px; padding-top: 6px; border-top: 1px dashed #e6efe9; }
.tp-cites-head { font-size: 10.5px; color: var(--muted); margin-bottom: 2px; }
.tp-cite { font-size: 10.5px; color: #4a6b5c; line-height: 1.65; }
#tutor-quick { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px 14px;
  border-top: 1px solid #eef4ef; background: #fff; }
#tutor-quick:empty { display: none; }
.tp-input { display: flex; gap: 8px; padding: 10px 14px; border-top: 1px solid #eaf1ec; }
#tutor-q { flex: 1; border: 1px solid #dbe7df; border-radius: 9px;
  padding: 8px 11px; font-size: 12.5px; }
#tutor-q:focus { border-color: #7fb597; }
#tutor-send { background: var(--green); color: #fff; padding: 0 16px;
  font-size: 12.5px; }
#tutor-send:hover { background: var(--green-d); }
.tp-foot { font-size: 10.5px; color: #a3b4aa; text-align: center; padding-bottom: 9px; }

/* 教师端：助教提问分析 */
.tp-intent-row { display: flex; align-items: center; gap: 8px;
  padding: 5px 14px; font-size: 12px; }
.tp-intent-name { width: 74px; color: var(--ink); }
.tp-intent-track { flex: 1; height: 8px; background: #eef2ef; border-radius: 5px; overflow: hidden; }
.tp-intent-track i { display: block; height: 100%; background: linear-gradient(90deg, #6fb894, var(--green)); }
.tp-intent-num { width: 26px; text-align: right; color: var(--muted); }

/* ---------- 课前预习小测 ---------- */
#btn-prequiz { background: rgba(255,255,255,.18); color: #fff; padding: 7px 14px; font-size: 12.5px; }
#btn-prequiz:hover { background: rgba(255,255,255,.28); }

.pq-body { display: block; overflow: auto; background: linear-gradient(180deg, #eef6f0, #f4f7f5 260px); }
.pq-header {
  position: sticky; top: 0; z-index: 20; height: 56px; display: flex; align-items: center;
  gap: 14px; padding: 0 20px; color: #fff;
  background: linear-gradient(90deg, #1f6b40, #2e8b57 60%, #3aa76d);
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}
.pq-header .brand { font-size: 18px; }
.pq-header .sp { flex: 1; }
#pq-user { font-size: 12.5px; background: rgba(255,255,255,.18); padding: 6px 12px; border-radius: 20px; }
.pq-link { color: #fff; text-decoration: none; font-size: 12.5px; background: rgba(0,0,0,.18);
  padding: 7px 14px; border-radius: 8px; }
.pq-link:hover { background: rgba(0,0,0,.28); }

.pq-wrap { max-width: 880px; margin: 0 auto; padding: 26px 18px 70px; }
.pq-hero { background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 30px 30px 26px; }
.pq-hero h1 { font-size: 24px; color: var(--green-d); margin-bottom: 10px; }
.pq-hero p { color: #4b5f54; line-height: 1.9; font-size: 13.5px; }
.pq-points { list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px; margin: 18px 0 22px; }
.pq-points li { background: var(--green-l); border-radius: 8px; padding: 10px 12px;
  font-size: 12.5px; color: #375242; }

.pq-main-btn { display: inline-block; background: var(--green); color: #fff; font-weight: 700;
  padding: 11px 24px; border-radius: 22px; font-size: 14px; text-decoration: none; text-align: center; }
.pq-main-btn:hover { background: var(--green-d); }
.pq-main-btn:disabled { background: #bcc9c1; cursor: not-allowed; }
.pq-ghost-btn { background: #fff; border: 1px solid var(--line); color: var(--green-d);
  padding: 10px 18px; border-radius: 20px; font-size: 13px; }

.pq-bar { display: flex; justify-content: space-between; align-items: center; background: #fff;
  border: 1px solid var(--line); border-radius: 10px; padding: 11px 16px; margin-bottom: 14px;
  font-size: 13px; position: sticky; top: 70px; z-index: 5; box-shadow: var(--shadow); }
#pq-progress { font-weight: 700; color: var(--green-d); }
.pq-bar-hint { color: var(--muted); font-size: 12px; }

.pq-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px 20px; margin-bottom: 14px; }
.pq-q-head { display: flex; align-items: center; gap: 9px; margin-bottom: 8px; }
.pq-no { width: 22px; height: 22px; border-radius: 50%; background: var(--green-l); color: var(--green-d);
  font-size: 12px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.pq-dim { font-size: 11px; background: #eef2ef; color: #607a6c; border-radius: 10px; padding: 2px 8px; }
.pq-mark { margin-left: auto; font-size: 12px; }
.pq-q-text { font-size: 14px; font-weight: 600; line-height: 1.8; margin-bottom: 12px; }
.pq-opts { display: flex; flex-direction: column; gap: 8px; }
.pq-opt { display: flex; align-items: flex-start; gap: 10px; border: 1px solid var(--line);
  border-radius: 9px; padding: 10px 12px; cursor: pointer; transition: all .15s;
  font-size: 13px; line-height: 1.7; }
.pq-opt:hover { border-color: #a9cbb8; background: #f7fbf8; }
.pq-opt.on { border-color: var(--green); background: var(--green-l); }
.pq-opt input { display: none; }
.pq-let { flex: 0 0 20px; height: 20px; border-radius: 50%; background: #eef2ef; color: #607a6c;
  font-size: 11.5px; font-weight: 700; display: flex; align-items: center; justify-content: center; margin-top: 1px; }
.pq-opt.on .pq-let { background: var(--green); color: #fff; }
.pq-actions { text-align: center; margin: 22px 0 8px; }

.pq-score-card { display: flex; align-items: center; gap: 24px; color: #fff; border-radius: 14px;
  padding: 24px 28px; margin-bottom: 16px; box-shadow: 0 6px 20px rgba(31,107,64,.24);
  background: linear-gradient(120deg, #1f6b40, #2e8b57); }
.pq-score-num { font-size: 44px; font-weight: 800; line-height: 1; }
.pq-score-num small { font-size: 18px; font-weight: 400; opacity: .75; }
.pq-score-label { margin-top: 6px; font-size: 12.5px; opacity: .85; }
.pq-score-side { margin-left: auto; text-align: right; font-size: 12.5px; }
.pq-score-side .badge { background: rgba(255,255,255,.22); color: #fff; }
.pq-score-tip { margin-top: 8px; opacity: .9; }
.pq-score-time { margin-top: 4px; font-size: 11px; opacity: .7; }

.pq-panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px 20px; margin-bottom: 16px; }
.pq-panel-head { font-weight: 700; color: var(--green-d); margin-bottom: 12px; }
.pq-panel-head span { font-weight: 400; color: var(--muted); font-size: 12px; }
.pq-dim-row { display: flex; align-items: center; gap: 12px; padding: 7px 0; font-size: 12.5px; }
.pq-dim-name { flex: 0 0 84px; color: #40564a; }
.pq-dim-track { flex: 1; height: 10px; background: #eef2ef; border-radius: 6px; overflow: hidden; }
.pq-dim-track i { display: block; height: 100%; border-radius: 6px; }
.pq-dim-num { flex: 0 0 42px; text-align: right; color: var(--muted); }

.pq-advice { background: #fff8e7; border: 1px solid #f3dfae; border-radius: var(--radius);
  padding: 18px 20px; margin-bottom: 16px; }
.pq-advice-head { font-weight: 700; color: #8a5a00; margin-bottom: 8px; }
.pq-advice p { font-size: 13px; line-height: 1.9; color: #6b5320; }
.pq-advice-actions { display: flex; gap: 12px; margin-top: 14px; }

.pq-review { border-top: 1px dashed var(--line); padding: 14px 0 4px; }
.pq-review:first-of-type { border-top: none; }
.pq-review .pq-q-head { margin-bottom: 6px; }
.pq-review .pq-q-text { font-size: 13px; font-weight: 500; }
.pq-ans-line { font-size: 12.5px; color: #4b5f54; line-height: 1.9; margin-bottom: 6px; }
.pq-ans-line b.right { color: var(--green-d); }
.pq-ans-line b.wrong { color: var(--accent); }
.pq-exp { font-size: 12px; color: #5d7367; background: #f4f8f5; border-radius: 8px;
  padding: 8px 11px; line-height: 1.8; }

.pq-toast { position: fixed; left: 50%; bottom: 36px; transform: translate(-50%, 20px); opacity: 0;
  background: rgba(35,53,44,.94); color: #fff; padding: 11px 22px; border-radius: 22px;
  font-size: 13px; pointer-events: none; transition: all .25s; z-index: 100; }
.pq-toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 640px) {
  .pq-score-card { flex-direction: column; align-items: flex-start; gap: 10px; }
  .pq-score-side { margin-left: 0; text-align: left; }
  .pq-bar-hint { display: none; }
}

/* ---------- 教师端：学习漏斗 / 卡点趋势 / 数据导出 / 评价量表 ---------- */
.fn-row { display: flex; align-items: center; gap: 10px; padding: 6px 14px; font-size: 12px; }
.fn-label { width: 80px; color: #40564a; }
.fn-track { flex: 1; height: 18px; background: #eef2ef; border-radius: 5px; overflow: hidden; }
.fn-track i { display: block; height: 100%; border-radius: 5px;
  background: linear-gradient(90deg, #6fb894, var(--green)); transition: width .4s; }
.fn-num { width: 88px; text-align: right; color: var(--muted); }

.tr-row { display: flex; align-items: center; gap: 10px; padding: 5px 14px; font-size: 12px; }
.tr-date { width: 44px; color: #40564a; }
.tr-track { flex: 1; height: 8px; background: #eef2ef; border-radius: 5px; overflow: hidden; }
.tr-track i { display: block; height: 100%; background: var(--green); border-radius: 5px; }
.tr-num { width: 128px; text-align: right; color: var(--muted); font-size: 11px; }

.export-row { display: flex; flex-wrap: wrap; gap: 8px; padding: 10px 14px 6px; }
.export-row button { background: var(--green-l); color: var(--green-d);
  border: 1px solid #cfe6d8; padding: 8px 12px; font-size: 12px; border-radius: 8px; }
.export-row button:hover { background: #d9efe2; }
.export-row button:disabled { opacity: .65; cursor: wait; }

.kw-chips { display: flex; flex-wrap: wrap; gap: 6px; padding: 4px 14px 8px; }
.kw-chip { background: var(--green-l); color: var(--green-d); border-radius: 12px;
  padding: 3px 9px; font-size: 11.5px; }

/* 教师端：教学 Skills */
.skill-tabs { display: flex; flex-wrap: wrap; gap: 6px; padding: 10px 14px 4px; }
.skill-tabs button { font-size: 12px; padding: 5px 10px; border-radius: 12px;
  background: #eef4f0; color: var(--green-d); border: 1px solid #dbe9e1; }
.skill-tabs button.active { background: var(--green); color: #fff; border-color: var(--green); }
.skill-fields { padding: 0 14px 8px; }
.skill-desc { font-size: 11.5px; color: var(--muted); line-height: 1.7; padding: 4px 0 8px; }
.skill-field { display: flex; flex-direction: column; gap: 3px; margin-bottom: 8px; }
.skill-field > span { font-size: 11.5px; font-weight: 700; color: var(--ink); }
.skill-field input, .skill-field select, .skill-field textarea {
  width: 100%; border: 1px solid #cfe0d6; border-radius: 8px;
  padding: 7px 9px; font-size: 12.5px; background: #fff; }
.skill-field textarea { line-height: 1.7; resize: vertical; }
.skill-actions { display: flex; align-items: center; gap: 8px; padding: 8px 14px; }
.skill-actions button { font-size: 12px; padding: 7px 12px; border-radius: 8px;
  background: var(--green-l); color: var(--green-d); border: 1px solid #cfe6d8; }
.skill-actions button:hover { background: #d9efe2; }
.skill-actions .skill-primary { background: var(--green); color: #fff; border-color: var(--green); }
.skill-actions .skill-primary:hover { background: var(--green-d); }
.skill-actions button:disabled { opacity: .65; cursor: wait; }
#skill-output { width: calc(100% - 28px); margin: 0 14px; border: 1px solid #cfe0d6;
  border-radius: 8px; padding: 9px 11px; font-size: 12px; line-height: 1.75;
  resize: vertical; background: #fbfdfb; }
.skill-run-item { padding: 7px 14px; border-top: 1px dashed #e8efeb; cursor: pointer; }
.skill-run-item:hover { background: #f6faf7; }
.skill-run-item .sr-head { font-size: 12.5px; font-weight: 700; color: var(--ink);
  display: flex; align-items: center; gap: 6px; }
.skill-run-item .sr-meta { font-size: 11px; color: var(--muted); margin-top: 1px; }

.rb-title { font-weight: 700; color: var(--green-d); padding: 4px 14px; }
.rb-note { font-size: 11.5px; color: var(--muted); padding: 2px 14px 8px; line-height: 1.7; }
.rb-scroll { overflow-x: auto; padding: 0 14px 10px; }
.rb-table { border-collapse: collapse; width: 100%; min-width: 680px; font-size: 11.5px; }
.rb-table th, .rb-table td { border: 1px solid var(--line); padding: 6px 8px;
  vertical-align: top; line-height: 1.7; text-align: left; }
.rb-table th { background: #f1f7f3; color: var(--green-d); white-space: nowrap; }

#am-rubric-btn { background: var(--green-l); color: var(--green-d); padding: 6px 12px;
  font-size: 12px; border-radius: 8px; margin-right: 8px; }
#am-rubric-btn:hover { background: #d9efe2; }
#am-rubric { max-height: 250px; overflow: auto; border-top: 1px solid var(--line);
  background: #fbfdfb; padding-top: 8px; }

/* ---------- 移动端适配：窄屏三栏改为纵向排列 ---------- */
@media (max-width: 900px) {
  html, body { height: auto; min-height: 100vh; }
  body { overflow: auto; }
  #topbar { height: auto; min-height: 56px; flex-wrap: wrap; padding: 8px 12px; gap: 8px; }
  .brand { font-size: 16px; }
  .brand small { display: none; }
  #stage-control { flex: 1 0 100%; justify-content: space-between; gap: 8px; }
  #stage-label { font-size: 12px; padding: 4px 10px; }
  .seg { padding: 5px 10px; font-size: 11.5px; }
  .top-actions { width: 100%; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 2px; }
  .top-actions > * { flex: 0 0 auto; }

  #main { flex-direction: column; flex: none; }
  #center { order: 1; width: 100%; height: 58vh; min-height: 340px; flex: none; }
  #toolbox { order: 2; width: 100% !important; height: 176px; flex: none;
    border-right: none; border-top: 1px solid var(--line); }
  #inspector { order: 3; width: 100% !important; height: 46vh; min-height: 260px; flex: none;
    border-left: none; border-top: 1px solid var(--line); }
  .drag-handle { display: none; }
  #canvas-wrap { width: 100%; touch-action: pan-x pan-y; }
  #canvas, #edges-svg { min-width: 0; }
  #canvas-zoom { top: 6px; right: 8px; }
  #code-panel { height: 46vh; min-height: 220px; }

  #cmp-box { width: 94vw; max-height: 88vh; overflow-y: auto; }
  #param-modal { width: 92vw; padding: 16px; }
  #assign-modal { max-height: 88vh; }
}

@media (max-width: 640px) {
  #center { height: 62vh; min-height: 320px; }
  #toolbox { height: 150px; }
  #inspector { height: 52vh; }
  .cmp-cards { grid-template-columns: 1fr; }
  .cmp-form { gap: 8px; }
  .cmp-form button { width: 100%; }

  .teacher-body .t-header { flex-wrap: wrap; padding: 10px 12px; gap: 8px; font-size: 13px; }
  .teacher-body .t-header > span:first-child { font-size: 16px !important; }
  .teacher-body .t-wrap { margin: 10px auto; padding: 0 10px; }
  .t-card { overflow-x: auto; }
  .t-card > table { min-width: 620px; }
  .t-card > table th, .t-card > table td { white-space: nowrap; }
  .kpi { padding: 11px 13px; }
  .kpi .k-num { font-size: 22px; }
}

/* ============ 多智能体交互式课堂 ============ */
.cls-body { overflow: auto; background: var(--bg); min-height: 100vh; }
.cls-header {
  height: 56px; flex: 0 0 56px; display: flex; align-items: center; gap: 12px;
  padding: 0 18px; color: #fff; z-index: 30;
  background: linear-gradient(90deg, #1f6b40, #2e8b57 55%, #3f9f74);
  box-shadow: 0 2px 8px rgba(0, 0, 0, .15);
}
.cls-header .brand { font-size: 19px; font-weight: 700; letter-spacing: 1px; }
.cls-header .brand small { font-size: 11px; font-weight: 400; opacity: .85; margin-left: 8px; }
.cls-header .sp { flex: 1; }
.cls-header #cls-user { font-size: 12.5px; background: rgba(255,255,255,.18);
  padding: 6px 12px; border-radius: 20px; }
.cls-link { color: #fff; font-size: 12.5px; text-decoration: none;
  background: rgba(255,255,255,.16); padding: 7px 13px; border-radius: 20px; }
.cls-link:hover { background: rgba(255,255,255,.28); }
#cls-logout { background: rgba(0,0,0,.22); color: #fff; padding: 7px 14px; font-size: 12.5px; }

.cls-wrap { flex: 1; width: 100%; max-width: 1500px; margin: 0 auto; padding: 14px;
  display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 14px; align-items: start; }
.cls-side { display: flex; flex-direction: column; gap: 12px; position: sticky; top: 14px; }
.cls-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 12px 13px; }
.cls-card h3 { font-size: 13.5px; color: var(--green-d); margin-bottom: 8px; }
.cls-card label { display: block; font-size: 12px; color: var(--muted); margin: 8px 0 3px; }
.cls-card input, .cls-card select, .cls-card textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 8px; padding: 7px 9px;
  font-size: 12.5px; color: var(--ink); background: #fbfdfc; margin-top: 3px;
}
.cls-card textarea { resize: vertical; line-height: 1.55; }
.cls-primary { background: var(--green); color: #fff; font-weight: 700;
  padding: 8px 14px; border-radius: 8px; font-size: 13px; width: 100%; margin-top: 10px; }
.cls-primary:hover { background: var(--green-d); }
.cls-primary:disabled { background: #b9c4bd; cursor: not-allowed; }
.cls-hint { font-size: 11px; color: var(--muted); line-height: 1.6; margin-top: 8px; }
.cls-dim { font-size: 11.5px; color: var(--muted); line-height: 1.6; padding: 4px 0; }

.cls-s-item { border: 1px solid var(--line); border-radius: 9px; padding: 8px 10px;
  margin-bottom: 7px; cursor: pointer; transition: all .15s; background: #fbfdfc; }
.cls-s-item:hover { border-color: var(--green); background: var(--green-l); }
.cls-s-item.on { border-color: var(--green); background: var(--green-l);
  box-shadow: inset 3px 0 0 var(--green); }
.cls-s-title { font-size: 12.5px; font-weight: 700; margin-bottom: 3px; }
.cls-s-meta { font-size: 11px; color: var(--muted); }
.cls-badge { font-size: 10px; padding: 1px 7px; border-radius: 10px; margin-right: 4px; }
.cls-badge.live { background: #e6f5ec; color: var(--green-d); }
.cls-badge.done { background: #eef1ef; color: var(--muted); }

.cls-main { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 14px; min-height: 420px; }
.cls-empty { color: #a9bcb0; font-size: 14px; text-align: center; padding: 90px 10px; line-height: 2; }
.cls-empty small { font-size: 12px; }
.cls-top { display: flex; align-items: flex-start; gap: 12px; }
.cls-top-title { flex: 1; min-width: 0; }
.cls-top h2 { font-size: 17px; color: var(--ink); }
.cls-meta { font-size: 11.5px; color: var(--muted); margin-top: 4px; }
.cls-top-actions { display: flex; gap: 8px; }
.cls-ghost { background: #eef4f0; color: var(--green-d); padding: 7px 12px; font-size: 12px; }
.cls-warn { background: var(--amber); color: #4a2c00; font-weight: 700;
  padding: 7px 12px; font-size: 12px; }
.cls-task { margin: 12px 0; background: var(--green-l); border: 1px dashed #bfe0cd;
  border-radius: 9px; padding: 10px 12px; font-size: 12.5px; line-height: 1.7; color: #2c5c45; }

.cls-body-grid { display: grid; grid-template-columns: 216px minmax(0, 1fr); gap: 12px; }
.cls-groups { display: flex; flex-direction: column; gap: 8px; }
.cls-g { border: 1px solid var(--line); border-radius: 9px; padding: 9px 10px;
  background: #fbfdfc; cursor: pointer; transition: all .15s; }
.cls-g:hover { border-color: var(--green); }
.cls-g.on { border-color: var(--green); background: var(--green-l); }
.cls-g-head { display: flex; justify-content: space-between; font-size: 12.5px; }
.cls-g-members { color: var(--muted); font-size: 11px; }
.cls-g-topic { font-size: 11.5px; color: var(--blue); margin-top: 3px; }
.cls-g-mine { font-size: 10.5px; color: var(--green-d); margin-top: 4px; }
.cls-join { margin-top: 6px; width: 100%; background: #fff; border: 1px solid var(--green);
  color: var(--green-d); font-size: 11.5px; padding: 5px; border-radius: 7px; }
.cls-join:hover { background: var(--green); color: #fff; }

.cls-chat { display: flex; flex-direction: column; min-width: 0; }
.cls-chat-head { display: flex; align-items: center; justify-content: space-between;
  gap: 8px; font-size: 13px; font-weight: 700; color: var(--green-d);
  border-bottom: 1px solid var(--line); padding-bottom: 7px; }
.cls-agent-legend { display: flex; flex-wrap: wrap; gap: 6px; font-weight: 400; }
.cls-agent-dot { font-size: 10.5px; padding: 2px 7px; border-radius: 10px;
  background: #f1f5f2; color: var(--muted); }
.cls-agent-dot.a-moderator { color: var(--blue); background: #eaf2f8; }
.cls-agent-dot.a-tutor { color: var(--green-d); background: #e6f5ec; }
.cls-agent-dot.a-challenger { color: #b5491f; background: #fdeee8; }
.cls-agent-dot.a-peer { color: #7a4d8f; background: #f3ecf7; }

.cls-msgs { height: 460px; overflow-y: auto; padding: 10px 4px 4px; display: flex;
  flex-direction: column; gap: 9px; }
.cm { border: 1px solid var(--line); border-radius: 10px; padding: 8px 11px;
  background: #fff; box-shadow: 0 1px 4px rgba(30,70,50,.05); }
.cm-head { display: flex; align-items: center; gap: 6px; font-size: 11.5px; flex-wrap: wrap; }
.cm-ava { font-size: 15px; }
.cm-head b { font-size: 12px; }
.cm-tag { font-size: 10px; color: var(--muted); background: #f1f5f2;
  padding: 1px 6px; border-radius: 8px; }
.cm-time { margin-left: auto; font-size: 10px; color: #b3c1b8; }
.cm-body { font-size: 12.5px; line-height: 1.75; margin-top: 5px; white-space: pre-wrap;
  word-break: break-word; }
.cm-cites { margin-top: 6px; padding-top: 5px; border-top: 1px dashed #e6efe9;
  font-size: 10.5px; color: var(--muted); }
.cm-cite { display: inline-block; background: #f4f8f5; border: 1px solid #e2ece6;
  border-radius: 8px; padding: 1px 7px; margin: 2px 4px 0 0; }
.cm-agent.a-moderator { border-left: 3px solid var(--blue); }
.cm-agent.a-tutor { border-left: 3px solid var(--green); background: #fbfefc; }
.cm-agent.a-challenger { border-left: 3px solid #e76f51; background: #fffcfb; }
.cm-agent.a-peer { border-left: 3px solid #a071b8; background: #fdfcfe; }
.cm-student { background: #f7faf8; }
.cm-student .cm-head b { color: var(--green-d); }
.cm-teacher { background: #fffbf0; border-left: 3px solid var(--amber); }

.cls-input { display: flex; gap: 8px; align-items: flex-end; margin-top: 8px; }
.cls-input textarea { flex: 1; border: 1px solid var(--line); border-radius: 9px;
  padding: 8px 10px; font-size: 12.5px; resize: vertical; line-height: 1.6;
  background: #fbfdfc; }
.cls-input .cls-primary { width: auto; margin: 0; padding: 9px 18px; }

.cls-summary { margin-top: 14px; border: 1px solid #d9e7de; border-radius: 10px;
  background: #fbfefc; padding: 12px 14px; }
.cls-summary-head { font-size: 13.5px; font-weight: 700; color: var(--green-d); margin-bottom: 8px; }
.cls-summary-body { font-family: inherit; font-size: 12.5px; line-height: 1.8;
  white-space: pre-wrap; color: var(--ink); }

.cls-toast { position: fixed; left: 50%; bottom: 26px; transform: translate(-50%, 20px);
  background: rgba(31, 61, 44, .94); color: #fff; font-size: 12.5px; padding: 9px 18px;
  border-radius: 20px; opacity: 0; pointer-events: none; transition: all .25s; z-index: 90; }
.cls-toast.show { opacity: 1; transform: translate(-50%, 0); }
.cls-toast.err { background: rgba(180, 45, 40, .95); }

@media (max-width: 980px) {
  .cls-wrap { grid-template-columns: 1fr; padding: 10px; }
  .cls-side { position: static; }
  .cls-body-grid { grid-template-columns: 1fr; }
  .cls-groups { flex-direction: row; overflow-x: auto; padding-bottom: 4px; }
  .cls-g { min-width: 150px; }
  .cls-msgs { height: 52vh; }
  .cls-header { flex-wrap: wrap; height: auto; padding: 9px 12px; gap: 8px; }
  .cls-header .brand { font-size: 16px; }
}

/* ===END=== */