:root{
  --blue:#2f6fed;--blue-d:#1d4ed8;--cyan:#22d3ee;
  --orange:#f97316;--amber:#fbbf24;--green:#22c55e;--purple:#7c3aed;
  --ink:#26324a;--muted:#64748b;
  --bg:#eef4ff;--card:#fff;--line:#e2e8f0;
  --shadow:0 12px 30px rgba(47,111,237,.12);--radius:20px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB",sans-serif;color:var(--ink);
  background:linear-gradient(160deg,#e7f0ff 0%,#fdf3e9 100%);background-attachment:fixed;line-height:1.75;min-height:100vh}
html{scroll-behavior:smooth}
/* 学生端锁定层 */
#lock-screen{position:fixed;inset:0;z-index:20000;display:flex;align-items:center;justify-content:center;padding:20px;
  background:linear-gradient(160deg,#e7f0ff 0%,#fdf3e9 100%)}
#lock-screen .lock-card{width:min(420px,94vw);background:#fff;border:2px solid #c7d2fe;border-radius:18px;box-shadow:0 16px 40px rgba(47,111,237,.18);padding:34px 30px;text-align:center}
.lock-icon{font-size:56px;line-height:1}
.lock-title{margin:14px 0 6px;font-size:24px;color:var(--blue-d)}
.lock-sub{color:var(--muted);font-size:14px;margin-bottom:18px}
#lock-screen select{width:100%;padding:11px 12px;font-size:15px;border:2px solid #c7d2fe;border-radius:10px;outline:none;background:#fff;color:var(--ink)}
#lock-screen select:focus{border-color:var(--blue)}
#lock-screen .lock-card .f{display:block;text-align:left;margin:12px 0 0}
#lock-screen .f span{display:block;font-size:13px;font-weight:700;color:var(--muted);margin-bottom:5px}
#lock-screen .f input{width:100%;padding:11px 12px;font-size:15px;border:2px solid #c7d2fe;border-radius:10px;outline:none;background:#fff;color:var(--ink)}
#lock-screen .f select{width:100%;padding:11px 12px;font-size:15px;border:2px solid #c7d2fe;border-radius:10px;outline:none;background:#fff;color:var(--ink);-webkit-appearance:auto;appearance:auto}
#lock-screen .f input:focus{border-color:var(--blue)}
#lock-screen .f input:disabled,#lock-screen .f select:disabled{background:#eef2ff;color:#94a3b8;cursor:not-allowed}
.btn-lock{width:100%;margin-top:18px;font-size:15px;padding:12px}
.lock-msg{margin-top:14px;font-size:14px;min-height:20px;color:#dc2626}
.lock-hint{font-size:12px;color:#94a3b8;margin:5px 0 0;min-height:17px;line-height:1.4}

/* 登录页姓名按钮区 */
#lock-screen .name-btns{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:10px}
#lock-screen .name-btns .name-btn{background:#eff6ff;border:1.5px solid #c7d2fe;color:#1d4ed8;padding:7px 14px;font-size:14px;font-weight:700;border-radius:999px;cursor:pointer;transition:.15s;line-height:1.2}
#lock-screen .name-btns .name-btn:hover{background:#dbeafe;border-color:#93c5fd;transform:translateY(-1px)}
#lock-screen .name-btns .name-btn:active{background:#bfdbfe;transform:translateY(0)}
#lock-screen .name-btns .name-btn.sel, #gb-code-btns .name-btn.sel{background:#2563eb;border-color:#1d4ed8;color:#fff}
.gbar-inp{margin:0}
#gb-code-btns{display:inline-flex;flex-wrap:wrap;gap:6px;align-items:center}
#gb-code-btns .name-btn{background:#eff6ff;border:1.5px solid #c7d2fe;color:#1d4ed8;padding:5px 11px;font-size:13px;font-weight:700;border-radius:999px;cursor:pointer;line-height:1.2;transition:.15s}
#gb-code-btns .name-btn:hover{background:#dbeafe;border-color:#93c5fd}

/* 顶栏 + 导航 */
.topbar{position:sticky;top:0;z-index:50;background:linear-gradient(90deg,var(--blue),#1d4ed8 60%,#3b82f6);color:#fff;box-shadow:0 4px 18px rgba(29,78,216,.35)}
.topbar-inner{max-width:1000px;margin:0 auto;padding:10px 20px 6px;display:flex;align-items:center;flex-wrap:wrap;row-gap:6px;position:relative;padding-right:108px}
.topbar-exit{position:absolute;top:50%;transform:translateY(-50%);right:12px;z-index:5;background:#fff;color:var(--blue-d);font-weight:800;border:none;border-radius:999px;padding:6px 16px;cursor:pointer;font-size:13px;box-shadow:0 2px 8px rgba(0,0,0,.18)}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;position:relative}
.brand-tit{display:flex;flex-direction:column;line-height:1.35;min-width:0}
#brand-title{background:transparent;border:none;outline:none;color:#fff;font-size:20px;font-weight:800;letter-spacing:.5px;cursor:pointer;width:auto;min-width:0;max-width:min(74vw,360px);appearance:none;-webkit-appearance:none;padding:4px 26px 5px 10px;border-radius:10px;border-bottom:1.5px dashed rgba(255,255,255,.35);background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='#ffffff' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");background-repeat:no-repeat;background-position:right 8px top 55%;transition:background-color .18s,border-color .18s}
#brand-title:hover{background-color:rgba(255,255,255,.14);border-bottom-color:rgba(255,255,255,.7)}
#brand-title:active{background-color:rgba(255,255,255,.22)}
#brand-title:focus-visible{box-shadow:0 0 0 2px rgba(255,255,255,.5)}
#brand-title option{color:var(--ink);font-weight:600;background:#fff}
/* 教师端控制单元：学生端下拉锁定为激活单元，另一单元灰态禁用 */
#brand-title.unit-locked{cursor:not-allowed;opacity:.96}
#brand-title.unit-locked option:disabled{color:#cbd5e1;background:#f1f5f9;font-weight:400}
.brand .dot{width:16px;height:16px;border-radius:50%;background:var(--amber);box-shadow:0 0 0 4px rgba(251,191,36,.35);flex:none}
.brand small{display:block;font-size:11px;font-weight:600;opacity:.85;margin-left:10px;letter-spacing:.3px}
.tabs{max-width:1000px;margin:0 auto;padding:6px 20px 0;display:flex;gap:4px;flex-wrap:nowrap}
.tab{background:rgba(255,255,255,.12);color:#eaf1ff;border:none;border-radius:12px 12px 0 0;padding:9px 6px;font-weight:700;cursor:pointer;font-size:14px;transition:.2s;flex:1 1 0;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tab:hover{background:rgba(255,255,255,.22)}
.tab.active{background:#fff;color:var(--blue-d)}

/* 单元切换：学生端标题处下拉（伪装成标题） / 教师端下拉 */
.tunit-sel{background:#fff;border:2px solid var(--line,#e2e8f0);border-radius:8px;padding:6px 10px;font-size:13px;font-weight:700;color:var(--ink,#334155);cursor:pointer;outline:none}
.tunit-sel:focus{border-color:#93c5fd}

/* ===================== 第二单元活动 ===================== */
/* 搜索引擎体验 */
.f-in,.f input.f-in,.f select.f-in{background:#fff;border:2px solid var(--line,#e2e8f0);border-radius:10px;padding:9px 12px;font-size:14px;outline:none;color:var(--ink);font-family:inherit;line-height:1.6;transition:.2s}
.f-in:focus,.f select.f-in:focus{border-color:var(--blue)}
.search-flow{display:flex;align-items:stretch;gap:8px;flex-wrap:wrap;margin:8px 0 4px;padding:6px;background:#f0f6ff;border-radius:12px}
.sf-step{flex:1 1 150px;background:#fff;border:1px solid var(--line,#e2e8f0);border-left:4px solid var(--blue,#2f6fed);border-radius:8px;padding:8px 12px;font-size:12px;color:#64748b}
.sf-step b{display:block;color:var(--blue-d,#1d4ed8);font-size:14px;margin-bottom:2px}
.sf-arrow{display:flex;align-items:center;color:#93c5fd;font-size:20px;font-weight:800;padding:0 2px}
.search-bar{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end;margin:4px 0 8px}
.search-results{margin-top:6px}
.sr-item{border:1px solid var(--line,#e2e8f0);border-left:4px solid #cbd5e1;border-radius:8px;padding:8px 12px;margin-bottom:8px;background:#fff}
.sr-item.high{border-left-color:#0ea5e9}
.sr-title{font-weight:700;color:var(--blue-d,#1d4ed8);margin-bottom:2px}
.sr-snip{font-size:13px;color:#475569;margin-bottom:6px}
.sr-meta{display:flex;gap:10px;font-size:12px;color:#64748b;flex-wrap:wrap}
.sr-site{font-weight:700;color:#334155}
.sr-type{background:#eef2ff;color:#4338ca;border-radius:999px;padding:1px 8px}
.sr-rel{color:#94a3b8}
/* 信息真伪判断 */
.truth-card{border:1px solid var(--line,#e2e8f0);border-radius:10px;padding:10px 12px;margin-bottom:10px;background:#fff}
.truth-card.t-ok{border-color:#86efac;background:#f0fdf4}
.tc-head{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12px;margin-bottom:6px}
.tc-src{font-weight:700;color:#334155}
.tc-type{background:#f1f5f9;color:#475569;border-radius:999px;padding:1px 8px}
.tc-time{color:#94a3b8;margin-left:auto}
.tc-text{font-size:14px;color:#1f2937;margin-bottom:8px}
.tc-judge{display:flex;gap:8px;flex-wrap:wrap}
.tj-btn{border:2px solid var(--line,#e2e8f0);background:#fff;border-radius:999px;padding:4px 16px;font-size:13px;font-weight:600;cursor:pointer;color:#475569;transition:.15s}
.tj-btn.on{background:var(--blue-d,#0ea5e9);border-color:var(--blue-d,#0ea5e9);color:#fff}
.tc-miss{margin-top:8px;font-size:13px;color:#b45309;background:#fffbeb;border-radius:8px;padding:6px 10px}
.tc-miss.t-okt{color:#166534;background:#f0fdf4}
/* 信息真伪：等待/依据/结果 */
.truth-wait{font-size:13px;color:#b45309;background:#fffbeb;border:1px dashed #fcd34d;border-radius:8px;padding:8px 12px}
.truth-base{margin:6px 0;font-size:12px;color:#475569;background:#f8fafc;border-radius:8px;padding:6px 10px}
.truth-base b{color:#2563eb}
.truth-result{margin-top:8px;font-size:13px;color:#166534;background:#f0fdf4;border:1px solid #86efac;border-radius:8px;padding:8px 12px;font-weight:600}
.truth-clue{margin:6px 0;font-size:12px;color:#7c3aed;background:#f5f3ff;border:1px solid #ddd6fe;border-radius:8px;padding:6px 10px}
.truth-clue b{color:#6d28d9}
.truth-tools{margin-top:10px;display:flex;flex-direction:column;gap:6px;align-items:flex-start}
.truth-hint{font-size:13px;line-height:1.6;color:#0f172a;background:#fff7ed;border:1px solid #fdba74;border-left:4px solid #f97316;border-radius:8px;padding:8px 12px;max-width:640px}
.truth-hint .th-tip{font-weight:700;color:#c2410c}
.truth-hint .th-load{color:#94a3b8;font-style:italic}
.truth-hint .th-err{color:#dc2626}
.btn.sm{font-size:12px;padding:4px 10px}
/* 目录树拖拽 */
.tree-drag{margin-top:6px}
.troot{background:linear-gradient(135deg,#0ea5e9,#6366f1);color:#fff;border-radius:10px;padding:8px 14px;font-weight:800;display:inline-block;font-size:14px}
.tbranches{display:flex;gap:12px;flex-wrap:wrap;margin:12px 0}
.tbranch{flex:1 1 180px;background:#f8fafc;border:1px solid var(--line,#e2e8f0);border-radius:10px;padding:8px 10px}
.tbranch-t{font-weight:700;color:#334155;margin-bottom:8px}
.tslots{display:flex;gap:8px;flex-wrap:wrap}
.tslot{min-width:90px;min-height:34px;border:2px dashed #cbd5e1;border-radius:8px;padding:5px 8px;text-align:center;font-size:13px;color:#1f2937;background:#fff;transition:.15s}
.tslot:hover{border-color:#0ea5e9;background:#f0f9ff}
.slot-emp{color:#94a3b8}
.tpool-title{font-size:13px;color:#64748b;margin:4px 0}
.tpool{display:flex;gap:8px;flex-wrap:wrap}
.tchip{border:1px solid #c4b5fd;background:#ede9fe;color:#5b21b6;border-radius:999px;padding:5px 14px;font-size:13px;font-weight:700;cursor:grab;user-select:none}
.tchip:active{cursor:grabbing}
/* 目录树：根-分支层级 + 内容分析 */
.tree-root{display:inline-flex;align-items:center;gap:6px;background:linear-gradient(135deg,#0ea5e9,#6366f1);color:#fff;border-radius:10px;padding:8px 14px;font-weight:800;font-size:14px;box-shadow:0 4px 12px rgba(99,102,241,.25)}
.troot-ico{font-size:16px}
.tbranch-idx{font-weight:800;color:#1e3a8a;display:flex;align-items:center;gap:6px;margin-bottom:8px}
.tbranch-idx::before{content:"└";color:#94a3b8}
.tree-ai{margin-top:10px;border:1px solid #a5b4fc;border-radius:10px;padding:10px 12px;background:#eef2ff}
.tree-ai-head{font-weight:800;color:#3730a3;margin-bottom:6px}
.tree-ai-msg{font-size:13px;color:#1f2937;margin-bottom:8px;line-height:1.6;background:#fff;border-radius:8px;padding:8px 10px}
.tree-ai-list{display:flex;flex-direction:column;gap:6px}
.tree-v{display:flex;align-items:flex-start;gap:8px;font-size:13px;background:#fff;border-radius:8px;padding:6px 10px}
.tv-k{color:#64748b;min-width:96px;font-weight:600}
.tv-v{flex:1;color:#475569}
.tv-ok{color:#15803d}
.tv-bad{color:#b91c1c}
/* 动态词云（数字作品类型） */
.wc-wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:10px 18px;padding:18px 10px;background:radial-gradient(circle at 50% 40%,#eff6ff,#e0f2fe);border:1px solid #bae6fd;border-radius:12px;min-height:120px}
.wc-token{color:#1e40af;font-weight:700;line-height:1.2;transition:.2s;cursor:default;position:relative}
.wc-token:hover{color:#0ea5e9;transform:scale(1.06);transform-origin:center}
.wc-token em{font-style:normal;font-size:11px;color:#7c9acf;margin-left:2px;vertical-align:super}
.wc-hint{text-align:center;font-size:12px;color:#64748b;margin-top:8px}
/* 网盘 */
.cloud-drive{margin-top:6px}
.cloud-hint{font-size:13px;color:#64748b;margin-bottom:8px}
/* 配额条 */
.cloud-quota{margin-bottom:10px}
.cq-bar{height:10px;border-radius:999px;background:#e2e8f0;overflow:hidden;border:1px solid #dbe3ef}
.cq-fill{height:100%;background:linear-gradient(90deg,#22d3ee,#2f6fed);border-radius:999px;transition:width .3s}
.cq-txt{font-size:12px;color:#64748b;margin-top:4px}
/* 操作工具栏 */
.cloud-tools{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.cf-btn{border:2px solid #93c5fd;background:#eff6ff;color:#1d4ed8;border-radius:999px;padding:6px 16px;font-size:13px;font-weight:700;cursor:pointer;transition:.15s}
.cf-btn:hover{background:#dbeafe}
.cf-btn:disabled{opacity:.45;cursor:not-allowed;background:#f1f5f9;border-color:#e2e8f0;color:#94a3b8}
.cloud-folders{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.cloud-folder{display:inline-flex;align-items:center;gap:6px;border:2px solid #93c5fd;background:#eff6ff;color:#1e40af;border-radius:8px;padding:6px 12px;font-weight:700;font-size:13px;transition:.15s}
.cf-ico{font-size:15px;line-height:1}
.cf-del{margin-left:4px;border:none;background:transparent;color:#94a3b8;font-size:12px;font-weight:800;cursor:pointer;border-radius:50%;width:18px;height:18px;line-height:1;display:inline-flex;align-items:center;justify-content:center}
.cf-del:hover{color:#dc2626;background:#fee2e2}
.cloud-fileset{border:1px solid var(--line,#e2e8f0);border-radius:10px;padding:8px 10px;margin-bottom:10px;background:#fff}
.cfs-t{font-weight:700;color:#334155;margin-bottom:6px;display:flex;align-items:center;gap:6px}
.cfs-n{background:#eef2ff;color:#4338ca;border-radius:999px;font-size:11px;padding:0 8px;font-weight:700}
.cfile{display:inline-flex;align-items:center;gap:8px;border:1px solid #e2e8f0;background:#f8fafc;border-radius:8px;padding:5px 10px;font-size:13px;margin:0 6px 6px 0;color:#334155;transition:.15s;flex-wrap:wrap;max-width:100%}
.cfile:hover{border-color:#0ea5e9}
.cfile-n{color:#1d4ed8;font-weight:600;cursor:pointer;word-break:break-all}
.cfile-n:hover{text-decoration:underline}
.cfile-s{font-size:12px;color:#94a3b8}
.cfile-by{font-size:12px;color:#7c3aed;background:#ede9fe;border-radius:999px;padding:0 7px}
.cfile-m select.cmv{border:2px solid #e2e8f0;border-radius:6px;padding:3px 6px;font-size:12px;color:#475569;outline:none;cursor:pointer;background:#fff}
.cfile-del{border:none;background:transparent;color:#cbd5e1;font-size:12px;font-weight:800;cursor:pointer;border-radius:50%;width:18px;height:18px;line-height:1;display:inline-flex;align-items:center;justify-content:center}
.cfile-del:hover{color:#dc2626;background:#fee2e2}
.cfs-empty{font-size:12px;color:#94a3b8}
.cloud-tip{margin-top:8px;font-size:13px;color:#b45309;background:#fffbeb;border-radius:8px;padding:6px 10px}

/* 顶栏 · 统一协作组 */
.gbar{margin-left:auto;padding:0 0 0 16px;color:#fff;font-size:13px;display:flex}
.gbar-label{font-weight:800;white-space:nowrap}
.gbar-inp{width:120px;border:none;border-radius:8px;padding:7px 10px;font-size:13px;outline:none;background:#fff;color:var(--ink)}
.gbar-msg{font-size:13px;font-weight:600}
.gbar-btn{background:#fff;color:var(--blue-d);font-weight:800;border:none;border-radius:999px;padding:7px 16px;cursor:pointer;transition:.2s}
.gbar-btn:hover{transform:translateY(-1px);box-shadow:0 4px 10px rgba(0,0,0,.2)}
.gbar-chip{background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.4);border-radius:999px;padding:5px 14px;font-weight:800}
.gbar-members{display:flex;gap:6px;flex-wrap:wrap}
.gbar-member{background:rgba(255,255,255,.16);border-radius:999px;padding:4px 12px;font-size:13px;font-weight:700}
.gbar-member.on{background:var(--amber);color:#7c2d12}

.wrap{max-width:1000px;margin:0 auto;padding:26px 20px 70px}
.sec{display:none;animation:fade .35s ease}
.sec.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

.sec-title{font-size:24px;font-weight:900;color:var(--blue-d);margin-bottom:6px}
.lead{color:var(--muted);margin-bottom:18px;font-size:15px}
.video{width:100%;height:100%;object-fit:cover;object-position:50% 60%;display:block;border-radius:14px}
.video-wrap{aspect-ratio:4/3;overflow:hidden;border-radius:14px;background:#000;box-shadow:var(--shadow)}

.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--line);padding:24px;margin-bottom:20px}
.card-head{font-size:18px;font-weight:900;display:flex;align-items:center;gap:8px;margin-bottom:8px;color:var(--ink)}
.sub{color:var(--muted);font-size:14px;margin-bottom:14px}
.sub b{color:var(--orange)}

/* 学习要点三卡片 */
.notes{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:14px;margin-bottom:20px}
.note-card{border-radius:18px;padding:16px;color:#fff}
.note-card.orange{background:linear-gradient(135deg,#f97316,#fbbf24)}
.note-card.blue{background:linear-gradient(135deg,#2f6fed,#22d3ee)}
.note-card.green{background:linear-gradient(135deg,#16a34a,#22c55e)}
.note-card .nc-t{font-weight:900;font-size:15px;margin-bottom:6px}
.note-card .nc-d{font-size:13.5px;opacity:.95}

/* 时间线 */
.timeline{position:relative;padding-left:26px}
.timeline::before{content:"";position:absolute;left:8px;top:6px;bottom:6px;width:3px;background:linear-gradient(var(--blue),var(--cyan));border-radius:3px}
.tl-item{position:relative;margin-bottom:16px}
.tl-item::before{content:"";position:absolute;left:-22px;top:6px;width:13px;height:13px;border-radius:50%;background:#fff;border:3px solid var(--blue);box-shadow:0 0 0 3px rgba(47,111,237,.18)}
.tl-item .tl-year{font-weight:900;color:var(--orange);font-size:15px}
.tl-item .tl-txt{font-size:14px;color:var(--ink)}

/* 排序游戏 */
.sort-list{display:flex;flex-direction:column;gap:10px}
.sort-card{display:flex;align-items:center;gap:12px;background:#f8fafc;border:2px solid var(--line);border-radius:14px;padding:12px 16px;cursor:grab;transition:.2s;text-align:left;width:100%;font-size:14px;user-select:none}
.sort-card:hover{border-color:var(--blue);transform:translateY(-1px)}
.sort-card.dragging{opacity:.45;border-color:var(--orange);border-style:dashed;cursor:grabbing}
.sort-card.over{border-color:var(--blue-d);background:#eff6ff;transform:scale(1.01)}
.sort-card .sc-num{font-weight:900;color:var(--blue-d);min-width:18px}
.sort-card .sc-handle{color:#cbd5e1;font-weight:800;font-size:16px;letter-spacing:-2px}
.sort-card .sc-txt{flex:1}
.ok{background:#f0fdf4!important;border-color:var(--green)!important}

/* 结构探索 */
.struct-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px}
@media(min-width:641px){.struct-grid{grid-template-columns:repeat(5,1fr)}}   /* PC端五种网络结构图标并排一行 */
.struct-card{background:#fff;border:2px solid var(--line);border-radius:16px;padding:14px;cursor:pointer;text-align:center;transition:.2s}
.struct-card:hover{border-color:var(--blue);transform:translateY(-2px)}
.struct-card.selected{border-color:var(--orange);background:#fff7ed}
.struct-card svg{display:block;margin:0 auto 8px}
.struct-card .sc-name{font-weight:900;color:var(--ink)}
.struct-card.selected .sc-name{color:var(--orange)}
/* 网络拓扑模拟 */
.struct-sim-wrap{margin-top:6px;border-top:1px dashed var(--line);padding-top:10px}
.struct-sim{background:#fff;border:2px solid var(--line);border-radius:16px;padding:10px;margin-top:8px}
.struct-sim .sim-hint{font-size:12px;color:var(--muted);line-height:1.6;background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:8px 10px;margin:0 0 8px}
.struct-sim .sim-hint b{color:var(--ink)}
.struct-sim .sim-svg{display:block;width:100%;max-width:520px;margin:0 auto}
.struct-sim .sl-vis{stroke:#7c8aa6;stroke-width:1.5;stroke-linecap:round;fill:none;cursor:pointer}
.struct-sim .sl-hit{stroke:transparent;stroke-width:10;stroke-linecap:round;fill:none;pointer-events:stroke;cursor:pointer}
.struct-sim g.slink:hover .sl-vis{stroke:var(--orange);stroke-width:2.5}
.struct-sim .sl-off{stroke:#cbd5e1;stroke-width:1.5;stroke-linecap:round;fill:none;stroke-dasharray:5 5}
.struct-sim g.slink.off{pointer-events:none}
.struct-sim circle{fill:#22d3ee;stroke:#fff;stroke-width:1.5;transition:fill .2s}
.struct-sim circle.hub{fill:var(--blue)}
.struct-sim circle.iso{fill:#ef4444;stroke:#dc2626}
/* 拓扑装饰（图标与模拟共用） */
.ic-ring{fill:none;stroke:#94a3b8;stroke-width:2}
.g-halo{fill:none;stroke:#93c5fd;stroke-width:1.2;stroke-dasharray:4 5;opacity:.42;stroke-linejoin:round}
/* 结构卡片图标（由同一份 nodes/links 生成，与模拟形状一致） */
.ic-svg{width:100%;height:90px;display:block}
.ic-link{stroke:#94a3b8;stroke-width:1.5}
.struct-sim .sim-foot{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-top:8px}
.struct-sim .sim-tip{font-size:13px;color:var(--muted)}
.struct-sim .sim-tip b{color:var(--orange)}
.msg{margin-top:14px;padding:14px 16px;border-radius:14px;font-size:14px}
.msg.ok{background:#f0fdf4;border:2px dashed var(--green)}
.msg.no{background:#fef2f2;border:2px dashed #f87171}
.msg.info{background:#eff6ff;border:2px dashed var(--blue)}
.msg b{color:var(--orange)}

/* 表（填空/应用/共享/打星共用） */
table.dt{width:100%;border-collapse:collapse;font-size:14px}
.dt th{background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;padding:10px 12px;text-align:left}
.dt td{border:1px solid var(--line);padding:8px 12px;vertical-align:middle}
.dt tr:nth-child(even) td{background:#f8fafc}
.dt .blank{width:100%;min-width:120px;border:2px dashed var(--amber);border-radius:10px;background:#fffbeb;padding:8px 10px;outline:none;font-size:14px}
.dt .blank:focus{border-color:var(--orange)}
.dt .ans-good{border:2px solid var(--green)!important;background:#f0fdf4!important}
.dt .ans-fill{color:var(--green);font-weight:800;padding:8px 10px}
.dt .td-note{color:var(--muted);font-size:13px}

/* 复用（寄信游戏） */
.sec-sub{color:var(--muted);font-size:15px}
.note{background:#fffbeb;border:1px dashed var(--amber);border-radius:14px;padding:14px 16px;font-size:14px;margin-top:12px}
.btn{background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;font-weight:800;border:none;border-radius:12px;padding:12px 22px;cursor:pointer;transition:.2s;font-size:15px}
.btn:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(47,111,237,.35)}
.btn.block{width:100%;text-align:center}
.btn.ghost{background:#fff;color:var(--blue-d);border:2px solid var(--blue)}
.btn.warn{background:linear-gradient(135deg,#f59e0b,#f97316)}
.btn.danger{background:linear-gradient(135deg,#ef4444,#dc2626)}
.btn.stop{background:linear-gradient(135deg,#ef4444,#dc2626)}
.btn.stop-mail{background:linear-gradient(135deg,#f59e0b,#f97316)}
.transfer-row{display:flex;align-items:center;flex-wrap:wrap;gap:8px;background:#fff7ed;border:1px solid #fed7aa;border-radius:10px;padding:8px 10px;margin-bottom:12px;font-size:13px;color:#9a3412}
.transfer-row select{flex:1;min-width:120px;padding:6px 8px;border:2px solid #fdba74;border-radius:8px;outline:none;background:#fff;color:var(--ink);font-size:14px}
.consent-ask{display:flex;align-items:center;flex-wrap:wrap;gap:10px;background:#eff6ff;border:1px solid #bfdbfe;border-radius:10px;padding:10px 12px;font-size:14px;color:#1d4ed8}
.consent-ask.dim{color:#64748b;background:#f1f5f9;border-color:#e2e8f0}
.consent-btns{display:flex;gap:8px;margin-left:auto}
.plan-confirm-box{background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-size:14px;color:var(--ink);margin-top:4px}
.plan-confirm-box .chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.chip{display:inline-block;padding:4px 12px;border-radius:20px;font-size:13px;background:#f1f5f9;border:1px solid var(--line);color:var(--muted)}
.chip-on{background:#ecfdf5;border-color:#6ee7b7;color:#047857;font-weight:700}
.chip-off{background:#f8fafc;border-color:#e2e8f0;color:#cbd5e1}
.p-c-done{color:#047857;font-weight:700}
.plan-sub-ok{background:#ecfdf5;border:1px solid #6ee7b7;border-radius:12px;padding:12px 14px;font-size:14px;color:#065f46;margin-bottom:12px}
.plan-log{margin-top:12px;background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:10px 14px}
.plan-log-t{font-size:13px;font-weight:900;color:var(--muted);margin-bottom:6px}
.plan-log-row{font-size:13px;color:var(--ink);padding:4px 0;border-bottom:1px dashed var(--line);display:flex;gap:10px}
.plan-log-row:last-child{border-bottom:none}
.pl-time{color:#94a3b8;font-size:12px;white-space:nowrap}
.t-view{cursor:pointer;text-decoration:underline dotted;color:var(--blue);font-weight:700}
.tpm-card{background:#fff;border-radius:16px;box-shadow:0 20px 50px rgba(2,6,23,.4);width:min(560px,94vw);max-height:86vh;overflow:auto;padding:20px 22px}
.tpm-head{font-size:18px;font-weight:800;color:var(--ink);margin-bottom:4px}
.tpm-meta{font-size:13px;color:var(--muted);margin-bottom:14px;padding-bottom:10px;border-bottom:1px dashed var(--line)}
.tpm-row{display:flex;gap:10px;padding:9px 0;border-bottom:1px solid var(--line)}
.tpm-k{flex:0 0 8.5em;font-weight:700;color:#475569;font-size:14px}
.tpm-v{flex:1;font-size:14px;color:var(--ink);line-height:1.7;white-space:pre-wrap;word-break:break-word}
.tpm-empty{color:#94a3b8;font-style:italic}
.tpm-none{color:#94a3b8;padding:24px 0;text-align:center}
.tpm-foot{text-align:right;margin-top:16px}
.tplans{display:flex;flex-direction:column;gap:8px}
.tplan-row{display:flex;align-items:center;gap:14px;flex-wrap:wrap;background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:10px 14px}
.tplan-g{font-size:15px;color:var(--ink);min-width:84px}
.tplan-meta{flex:1;font-size:13px;color:var(--muted)}
.tplan-meta.none{color:#94a3b8}
.f{display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:700;color:var(--muted)}
.f input,.f select,.plan-grid input,.plan-grid textarea{background:#fff;border:2px solid var(--line);border-radius:10px;padding:10px 12px;font-size:15px;outline:none;transition:.2s;color:var(--ink);font-family:inherit;line-height:1.6}
.f input:focus,.f select:focus,.plan-grid input:focus,.plan-grid textarea:focus{border-color:var(--blue)}
.plan-grid textarea.pfield{resize:none;overflow:hidden;min-height:46px;width:100%;display:block}
textarea{width:100%;border:2px solid var(--line);border-radius:12px;padding:12px;font-size:15px;resize:vertical;outline:none;font-family:inherit}
textarea:focus{border-color:var(--blue)}
.role-badge{display:inline-block;color:#fff;font-weight:800;padding:6px 16px;border-radius:999px;font-size:15px}
.members{display:flex;gap:10px;flex-wrap:wrap}
.member{display:flex;flex-direction:column;align-items:center;gap:4px;background:#f8fafc;border:2px solid var(--line);border-radius:14px;padding:10px 16px;min-width:96px}
.member .m-name{font-weight:800;font-size:14px}
.member .m-role{font-size:12px;color:#fff;font-weight:700;border-radius:999px;padding:2px 12px}
.member.you{border-color:var(--orange);background:#fff7ed}
.chip-todo{border:2px dashed var(--amber);color:#b45309;font-weight:800;display:flex;align-items:center;justify-content:center;border-radius:14px;padding:10px;min-width:96px;font-size:13px;text-align:center}
.mails{border-left:4px solid var(--blue);background:#f8fafc;border-radius:0 12px 12px 0;padding:10px 14px;max-height:220px;overflow:auto}
.mails .mrec{font-size:13px;padding:5px 0;border-bottom:1px dashed var(--line)}
.mails .mrec .t{color:var(--muted);font-size:11px;margin-right:8px}
.letter-show{background:#fdf6ee;border:2px solid #fcd9a8;border-radius:14px;padding:18px;font-family:Georgia,"KaiTi","楷体",serif;color:#7a4f2b}
.letter-show .lt{font-size:18px;font-weight:800;margin-bottom:8px}
.netflash{background:linear-gradient(135deg,#0ea5e9,#7c3aed);color:#fff;border-radius:14px;padding:18px;text-align:center;font-weight:800}
.opt-m{display:block;width:100%;text-align:left;border:2px solid var(--line);border-radius:14px;padding:12px 16px;margin-bottom:10px;cursor:pointer;background:#fff;font-size:14px;transition:.2s}
.opt-m:hover{border-color:var(--blue)}
.panel-title{font-size:17px;font-weight:900;margin:14px 0 12px}
.map-stop{text-anchor:middle;font-size:12px;font-weight:800;fill:#64748b}
.map-node{stroke:#cbd5e1;stroke-width:2;fill:#f1f5f9}
.map-node.cur{stroke:var(--orange);stroke-width:4;fill:#fff7ed}
.map-node.past{fill:#dbeafe;stroke:#3b82f6}
.map-line{stroke:#cbd5e1;stroke-width:3;stroke-dasharray:5 5}
.map-line.past{stroke:#3b82f6;stroke-dasharray:none}
.map-flash{stroke:#f59e0b;stroke-width:3}
.scene-title{font-size:16px;font-weight:900;color:var(--blue-d);margin-bottom:6px;text-align:center}
.scene-box{background:#fff;border-radius:14px;overflow:hidden}
.scene-box svg{display:block;width:100%;height:auto}

/* 共享经济 */
.share-row{display:flex;align-items:stretch;gap:12px;margin:14px 0;flex-wrap:wrap}
.share-item{flex:1;min-width:180px;background:#f8fafc;border:2px solid var(--line);border-radius:14px;padding:12px 16px;text-align:center}
.share-item b{display:block;color:var(--blue-d);margin-bottom:4px}
.share-item .si-d{color:var(--muted);font-size:13px}
.share-arrow{display:flex;align-items:center;color:var(--orange);font-size:24px;font-weight:900}

/* 区域（数字丝路等） */
.eur{background:#f4f6ff;border-left:4px solid var(--blue);border-radius:0 12px 12px 0;padding:12px 16px;margin-bottom:12px}
.eur-b{color:var(--blue-d);margin-bottom:4px}

.reference{background:#f0fdf4;border:2px dashed var(--green);border-radius:14px;padding:16px;margin-top:14px;font-size:14px}
.reference ul{margin:6px 0 0 20px}
.reference li{margin:4px 0}

/* 项目展开 */
.plan-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:20px}
.plan-step{background:#fff;border-radius:16px;border:2px solid var(--line);padding:14px;text-align:center}
.plan-step .ps-n{width:34px;height:34px;line-height:34px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;font-weight:900;font-size:16px;margin:0 auto 8px;display:block}
.plan-step .ps-t{font-weight:900;color:var(--blue-d)}
.plan-step .ps-d{font-size:12.5px;color:var(--muted);margin-top:4px}
.plan-grid{display:grid;grid-template-columns:1fr;gap:12px}

/* 打星 */
table.rt{border-collapse:collapse;width:100%}
.rt th{background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;padding:10px 12px;text-align:left}
.rt td{border:1px solid var(--line);padding:10px 12px;font-size:14px}
.rt tr:nth-child(odd) td{background:#f8fafc}
.stars{display:flex;gap:4px}
.star{font-size:24px;cursor:pointer;color:#e2e8f0;transition:.15s;user-select:none}
.star.on{color:var(--amber)}
.rt-dim{background:#eef2ff;font-weight:700;color:#4f46e5;text-align:center;vertical-align:middle;width:90px}
.rt-peer-hint{color:var(--muted);font-size:13px;margin-top:4px}
/* 我收到的同伴评价 */
.peer-box{display:flex;flex-direction:column;gap:8px;margin-top:8px}
.peer-row{display:flex;align-items:center;gap:10px;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:12px;padding:10px 14px;font-size:14px}
.peer-row .pr-name{font-weight:800;color:var(--green)}
.peer-box .peer-row.bottom{border-color:var(--line);background:#f8fafc}
.peer-box .peer-row b{color:var(--orange)}

/* 表格容器横向可滚动：防移动端溢出 */
#share-table,#appear-table,#rating-table{overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%}

.footer{text-align:center;color:var(--muted);font-size:13px;padding:20px 20px 40px}
@media(max-width:640px){.topbar-inner{padding:10px 56px 2px 14px}.topbar-exit{top:12px;transform:none;right:8px;padding:5px 14px}.gbar{margin-left:0;flex-basis:100%;padding:6px 0 0}.wrap{padding:18px 12px 60px}.sec-title{font-size:20px}.gbar-members{flex-wrap:nowrap;overflow-x:auto}}

/* 移动端优化：表1-2/应用表格 与 项目评价表 */
@media(max-width:640px){
  #share-table table.dt,#appear-table table.dt{min-width:560px}
  #rating-table table.rt{min-width:600px}
  .dt th,.dt td{padding:7px 6px}
  .dt .blank{min-width:112px;padding:7px 8px;font-size:13px}
  .rt th{white-space:nowrap;padding:8px 6px;font-size:12.5px}
  .rt td{padding:8px 6px;font-size:12.5px}
  .rt-dim{width:56px;font-size:12px}
  #rating-table .stars{justify-content:center}
  #rating-table .star{font-size:19px}
  .share-row{flex-wrap:nowrap}.share-item{min-width:0;padding:10px 8px}.share-arrow{flex:0 0 26px}
  #gm5-memberbar .members{flex-wrap:nowrap;align-items:stretch}
  #gm5-memberbar .member{flex:1 1 0;min-width:0;padding:8px 4px}
  #gm5-memberbar .member .m-name{font-size:11px}
  #gm5-memberbar .member .m-role,#gm5-memberbar .member .m-addr,#gm5-memberbar .member .m-mailtag,#gm5-memberbar .member .m-postman,#gm5-memberbar .member .m-sendtag{font-size:10px;padding:1px 6px}
}

/* ============ 邮寄信件 · 邮政工作台 ============ */
.gm5-stage{margin:4px 0 14px;background:#eef4ff;border:1px dashed var(--blue);border-radius:12px;padding:10px 14px;font-size:14px;color:var(--blue-d)}
.gm5-col{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px}
.gm5-box{background:#f8fafc;border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:14px}
.gm5-box-title{font-weight:900;font-size:14px;margin-bottom:10px;color:var(--ink);display:flex;align-items:center;gap:6px}
.addr-big{color:var(--orange);font-size:18px;letter-spacing:1px}
.member .m-addr{background:var(--blue);color:#fff;border-radius:8px;padding:1px 8px;font-weight:800;font-size:13px;letter-spacing:1px}
.member .m-mailtag{background:#ede9fe;color:var(--purple);border-radius:999px;padding:2px 12px;font-weight:800;font-size:13px;letter-spacing:1px}
.member.you .m-mailtag{background:var(--purple);color:#fff}
.member .m-postman{font-size:11px;color:var(--purple);font-weight:800}
.member .m-sendtag{font-size:11px;color:var(--orange);font-weight:800}
.poc{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px;margin-bottom:10px}
.poc-h{font-size:13px;margin-bottom:8px;color:var(--ink)}
.poc-h b{color:var(--orange)}
.btn.sm{padding:6px 14px;font-size:13px;border-radius:9px}
.note.sm{padding:10px 12px;font-size:13px}
.env-mini{transform:scale(.96);transform-origin:top left;width:104%}

/* 名单管理表 */
.rsheet{overflow-x:auto;border:1px solid #e2e8f0;border-radius:10px;background:#fff}
.rsheet .rt{margin:0}
.rsheet .rt th{background:#f1f5f9;color:#475569;font-size:13px;padding:9px 12px}
.rsheet .rt td{padding:8px 12px;font-size:14px;vertical-align:middle}
.rsheet .r-cell{color:#334155}
.rsheet .r-cell.g{font-family:"JetBrains Mono",Menlo,Consolas,monospace;letter-spacing:.5px;font-variant-numeric:tabular-nums}
.rsheet .r-cell.strong{font-weight:600;color:#0f172a}
.rsheet tbody tr:nth-child(odd) td{background:#f8fafc}
.rsheet tbody tr:hover td{background:#eff6ff}
.rsheet tr.editing td{background:#ecfdf5}
.rsheet .r-group td{background:#eef4ff;border-bottom:1px solid #dbeafe}
.rsheet .r-group .r-cell{color:#1d4ed8;font-weight:600;white-space:nowrap;font-size:13px}
.rsheet .r-group .r-cells{padding:7px 12px;color:#0f172a;font-weight:400}
.rsheet .r-tag{display:inline-flex;align-items:center;gap:3px;background:#fff;border:1px solid #c7d2fe;color:#1d4ed8;border-radius:999px;padding:3px 6px 3px 10px;font-size:13px;margin:3px 4px 3px 0;font-weight:500}
.rsheet .r-tag-b{width:18px;height:18px;line-height:1;border:none;background:#e2e8f0;color:#334155;border-radius:50%;cursor:pointer;font-size:12px;padding:0}
.rsheet .r-tag-b:hover{background:#c7d2fe}
.rsheet .r-tag-b.del{background:#fee2e2;color:#b91c1c}
.rsheet .r-tag-b.del:hover{background:#fecaca}
.rsheet .blank{width:74px;padding:6px 8px;border:1px solid #cbd5e1;border-radius:6px;font-size:14px;outline:none}
.rsheet .blank:focus{border-color:#22c55e;box-shadow:0 0 0 2px rgba(34,197,94,.18)}
.rsheet .btn{white-space:nowrap}
@media(max-width:640px){.rsheet .rt th,.rsheet .rt td{padding:7px 8px;font-size:13px}.rsheet .blank{width:62px}}

/* 信封 */
.envelope{position:relative;background:linear-gradient(180deg,#fffdf5,#f9f3e2);border:1px solid #e6d9b8;border-radius:12px;padding:16px 18px 14px;box-shadow:inset 0 0 0 1px #f5eeda,0 8px 18px rgba(180,150,90,.12);font-size:13px;color:#5b4d2a;line-height:1.5}
.env-stamp{position:absolute;top:12px;right:14px;border:2px dashed #d9b76a;border-radius:8px;padding:4px 8px;text-align:center;font-size:10px;font-weight:700;color:#a8842f;background:#fffdf2;transform:rotate(3deg)}
.env-stamp b{display:block;font-size:22px;color:#c0392b}
.env-stamp span{letter-spacing:1px}
.env-to{max-width:75%}
.env-zip{font-family:monospace;letter-spacing:3px;font-weight:700;color:#a8842f}
.env-line{font-size:12.5px;margin:3px 0;word-break:break-all}
.env-addr{width:auto;text-align:center;font-weight:800;color:var(--blue-d);background:#fff;border:1px dashed var(--blue);border-radius:6px;padding:1px 4px;font-size:13px;outline:none}
input.env-addr:focus{border-color:var(--orange);background:#fff7ed}
.env-name{width:auto;text-align:center;font-family:inherit;font-weight:800;color:var(--blue-d);background:#fff;border:1px dashed var(--blue);border-radius:6px;padding:1px 6px;font-size:13px;outline:none}
input.env-name:focus{border-color:var(--orange);background:#fff7ed}
.env-from .env-name,.env-from input.env-addr{font-weight:800}
.env-to{font-weight:700}
.env-whoto{font-family:"KaiTi","楷体",serif;font-size:13px;margin-top:2px}
.env-to input.env-to,.env-fix{font-family:inherit}
input.env-to{background:transparent;border:none;border-bottom:1px dashed var(--blue);color:var(--blue-d);font-weight:800;outline:none;width:110px}
.env-fix{font-family:"KaiTi",serif;font-weight:800}
/* 收发信件标签：与「📮邮递员」标签（.m-postman）同风格——紫色小胶囊按钮 */
.env-fix.grp{background:#ede9fe;color:var(--purple);border-radius:999px;padding:1px 10px;font-weight:800;font-size:12.5px;display:inline-block;white-space:nowrap}
.env-fix.send{background:#ede9fe;color:var(--purple);border-radius:999px;padding:1px 10px;font-weight:800;font-size:12.5px;display:inline-block;white-space:nowrap}
.env-bodyarea{margin:12px 0 10px 18px;min-height:44px;max-width:70%}
textarea.env-body{width:100%;background:#fff;border:1px solid var(--line);border-radius:8px;padding:8px 10px;font-size:13px;outline:none;resize:vertical;font-family:"KaiTi",serif;color:#5b4d2a}
textarea.env-body:focus{border-color:var(--blue)}
.env-body.view{font-family:"KaiTi",serif;font-size:15px;color:#7a4f2b;white-space:pre-wrap}
.env-from{margin-top:4px;padding-top:8px;border-top:1px dashed #e6d9b8;font-size:12.5px}
.env-from .env-line{text-align:right}
.env-from .env-line input,.env-from .env-line .env-fix{font-weight:800}

/* ============ 教师端 / 班级管理 ============ */
.teacher-btn{background:var(--amber);color:#7c2d12;font-weight:900;border:none;border-radius:999px;padding:7px 16px;cursor:pointer;font-size:13px;transition:.2s;margin-left:6px;white-space:nowrap}
.teacher-btn:hover{transform:translateY(-1px);box-shadow:0 4px 10px rgba(0,0,0,.25)}
.tcontrol{display:flex;align-items:flex-end;gap:12px;flex-wrap:wrap}
.tcontrol .f select{background:#fff;border:2px solid var(--line);border-radius:10px;padding:10px 12px;font-size:15px;outline:none;min-width:130px;color:var(--ink)}
.tcontrol .f select:focus{border-color:var(--blue)}
.ok-dot{color:var(--green);font-weight:800}
.off-dot{color:#94a3b8;font-weight:800}
#tstatus{font-size:14px;line-height:1.9}
#tstatus b{color:var(--blue-d)}

/* 柱形图（纯 CSS） */
.tchart{display:flex;align-items:flex-end;gap:10px;flex-wrap:wrap;min-height:210px}
.tcol{display:flex;flex-direction:column;align-items:center;width:56px}
.tbar-wrap{width:44px;height:140px;background:#eef4ff;border:1px solid var(--line);border-radius:8px 8px 4px 4px;overflow:hidden;display:flex;align-items:flex-end}
.tbar{width:100%;background:linear-gradient(180deg,var(--cyan),var(--blue));border-radius:6px 6px 2px 2px;transition:height .4s ease;min-height:4px}
.tval{font-weight:900;color:var(--blue-d);font-size:15px;margin-top:6px}
.tcode{font-size:11px;color:var(--orange);font-weight:800}
.tname{font-size:12px;color:var(--muted)}
.tlegend{width:100%;font-size:12px;color:#94a3b8;margin-top:6px}

/* 讨论墙 */
.tnotes{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:14px}
.tnote{position:relative;min-height:170px;background:linear-gradient(180deg,#fff9c4,#fef3c7);color:#78350f;border-radius:4px 4px 14px 4px;padding:16px 14px 12px;display:flex;flex-direction:column;box-shadow:0 3px 8px rgba(0,0,0,.12);transform:rotate(-.5deg)}
.tnote:nth-child(3n){background:linear-gradient(180deg,#d7f3ec,#ccf0e6);transform:rotate(.6deg)}
.tnote:nth-child(3n+1){background:linear-gradient(180deg,#ffe3ef,#fcd8e8);transform:rotate(-.3deg)}
.tnote::before{content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);width:46px;height:14px;background:rgba(255,255,255,.55);border-radius:0 0 6px 6px;box-shadow:0 1px 2px rgba(0,0,0,.08)}
.tnote-dot{width:8px;height:8px;border-radius:50%;background:#f43f5e;position:absolute;top:4px;left:10px;box-shadow:0 0 0 2px rgba(244,63,94,.25)}
.tnote .tp-body{flex:1;font-size:13.5px;color:inherit;line-height:1.55;overflow-wrap:break-word}
.tnote-foot{font-size:12px;color:inherit;opacity:.75;margin-top:8px;border-top:1px dashed rgba(120,53,15,.25);padding-top:6px}
.tnote-foot b{color:inherit}
.tp-time{font-size:10.5px;opacity:.7;margin-left:2px}

/* 讨论墙提交 + 打开的信用标签 */
.discuss-inp{flex:1;min-width:220px;background:#fff;border:2px solid var(--line);border-radius:12px;padding:12px;font-size:15px;outline:none;color:var(--ink)}
.discuss-inp:focus{border-color:var(--blue)}
#discuss-msg{margin-top:10px}
.new-tag{background:var(--orange);color:#fff;font-weight:800;border-radius:999px;padding:1px 9px;font-size:11px}
.opened-tag{background:#d1fae5;color:#065f46;font-weight:800;border-radius:999px;padding:1px 9px;font-size:11px}

/* 顶栏班级下拉（复用 gbar 输入框外观） */
select.gbar-inp{width:auto;padding:7px 8px;cursor:pointer}
@media(max-width:640px){.teacher-btn{font-size:12px;padding:6px 12px}}