:root{
  --blue:#409eff; --blue-d:#2b7de9; --blue-l:#ecf4ff;
  --bg:#f5f7fa; --card:#fff; --line:#e5e8ee; --line-2:#eef1f5;
  --text:#1f2430; --text-2:#5b6472; --muted:#8b94a3;
  --green:#3aa76d; --orange:#e6932f; --red:#e05b5b;
  --radius:12px; --shadow:0 2px 12px rgba(23,35,64,.06);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--text);
  font:14px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
}
.hidden{display:none !important}
.muted{color:var(--muted);margin:0;font-size:13px}
a{color:var(--blue);text-decoration:none}
code{background:#f2f4f8;padding:1px 5px;border-radius:5px;font-size:12.5px}

/* ---------- 登录 ---------- */
.login-layer{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,#eaf2ff,#f7f9fc 55%,#eef3fb);z-index:50}
.login-card{width:392px;background:var(--card);border-radius:16px;padding:34px 32px 30px;
  box-shadow:0 14px 40px rgba(23,35,64,.12);display:flex;flex-direction:column;gap:14px}
.login-brand{text-align:center;margin-bottom:8px}
.logo{display:inline-block;font-weight:800;font-size:22px;color:var(--blue);
  background:var(--blue-l);padding:8px 16px;border-radius:12px;letter-spacing:.5px}
.login-brand h1{margin:14px 0 6px;font-size:20px}
.field{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--text-2)}
.field input,.field select,.field textarea{
  border:1px solid var(--line);border-radius:9px;padding:9px 12px;font-size:14px;outline:none;
  background:#fbfcfe;color:var(--text);font-family:inherit;width:100%}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--blue);background:#fff;
  box-shadow:0 0 0 3px rgba(64,158,255,.12)}
.login-error{color:var(--red);font-size:13px;min-height:18px;text-align:center}

/* ---------- 布局 ---------- */
.layout{display:flex;min-height:100vh}
.sidebar{width:216px;flex:0 0 216px;background:#fff;border-right:1px solid var(--line);
  display:flex;flex-direction:column;position:sticky;top:0;height:100vh}
.side-brand{padding:20px 18px 14px;display:flex;align-items:center;gap:10px}
.logo-sm{font-weight:800;color:#fff;background:var(--blue);padding:4px 9px;border-radius:8px;font-size:13px}
.side-title{font-weight:600;font-size:15px}
.nav{padding:6px 10px;flex:1;overflow:auto}
.nav a{display:flex;align-items:center;justify-content:space-between;gap:8px;color:var(--text-2);
  padding:9px 12px;border-radius:9px;margin-bottom:2px;font-size:13.5px}
.nav a:hover{background:#f4f7fb;color:var(--text)}
.nav a.active{background:var(--blue-l);color:var(--blue-d);font-weight:600}
.nav .badge{background:var(--red);color:#fff;border-radius:10px;padding:0 7px;font-size:11px;line-height:17px;min-width:18px;text-align:center}
.nav a.active .badge{background:var(--blue);}
.side-user{border-top:1px solid var(--line-2);padding:12px 14px;display:flex;align-items:center;gap:10px}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--blue-l);color:var(--blue-d);
  display:flex;align-items:center;justify-content:center;font-weight:700}
.user-meta{flex:1;min-width:0}
.user-name{font-size:13.5px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.user-role{font-size:11.5px;color:var(--muted)}

.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;
  padding:22px 26px 10px}
.topbar h2{margin:0 0 2px;font-size:19px}
.topbar-actions{display:flex;gap:8px;flex-wrap:wrap}
.content{padding:8px 26px 40px}

/* ---------- 组件 ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:18px;margin-bottom:16px}
.card h3{margin:0 0 12px;font-size:15px}
.grid{display:grid;gap:14px}
.grid.cols-4{grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow)}
.stat .k{color:var(--muted);font-size:12.5px}
.stat .v{font-size:26px;font-weight:700;margin-top:4px;letter-spacing:.5px}
.stat .v.blue{color:var(--blue-d)}
.stat .v.orange{color:var(--orange)}
.stat .v.green{color:var(--green)}
.stat .sub{color:var(--muted);font-size:12px;margin-top:2px}

.btn{border:1px solid var(--line);background:#fff;color:var(--text-2);border-radius:9px;
  padding:8px 14px;font-size:13.5px;cursor:pointer;font-family:inherit;transition:.15s;white-space:nowrap}
.btn:hover{border-color:#cfd8e6;color:var(--text)}
.btn-primary{background:var(--blue);border-color:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-d);border-color:var(--blue-d);color:#fff}
.btn-block{width:100%;padding:11px}
.btn-sm{padding:4px 10px;font-size:12.5px;border-radius:7px}
.btn-ghost{border-color:transparent;background:transparent}
.btn-danger{color:var(--red);border-color:#f2d5d5}
.btn-danger:hover{background:#fdf2f2;border-color:#eebcbc;color:var(--red)}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.icon-btn{border:0;background:transparent;font-size:20px;line-height:1;color:var(--muted);cursor:pointer;padding:2px 6px}
.icon-btn:hover{color:var(--text)}

.toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:14px}
.toolbar input[type=text],.toolbar input[type=search],.toolbar select{
  border:1px solid var(--line);border-radius:9px;padding:8px 11px;font-size:13.5px;outline:none;
  background:#fff;font-family:inherit;color:var(--text)}
.toolbar input:focus,.toolbar select:focus{border-color:var(--blue)}
.search{min-width:220px}

table{width:100%;border-collapse:collapse;font-size:13.5px}
th,td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line-2);vertical-align:middle}
th{color:var(--muted);font-weight:600;font-size:12.5px;background:#fafbfd;white-space:nowrap}
tbody tr:hover{background:#fafcff}
td.name{font-weight:600}
td .sub{color:var(--muted);font-size:12px}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow)}
.table-wrap table{min-width:960px}
.nowrap{white-space:nowrap}
.actions{display:flex;gap:6px;flex-wrap:wrap}

.tag{display:inline-block;padding:1px 8px;border-radius:20px;font-size:11.5px;background:#f0f3f8;color:var(--text-2);margin-right:4px}
.tag-blue{background:var(--blue-l);color:var(--blue-d)}
.tag-green{background:#eaf7f0;color:#2f8f5d}
.tag-orange{background:#fdf3e5;color:#b4761d}
.tag-red{background:#fdeef0;color:#c23f4c}
.tag-gray{background:#f1f3f6;color:#7b8494}
/* 学习包付费 / 免费标记：沿用现有色板（付费=橙、免费=绿） */
.tag-pay{background:#fdf3e5;color:#b4761d}
.tag-free{background:#eaf7f0;color:#2f8f5d}

/* 包内各语言学习包名的逐行展示 */
.trans-list{margin:4px 0 2px}
.trans-line{display:flex;gap:8px;align-items:center;padding:2px 0;font-size:13px}
.trans-line .tag{margin-right:0}

.pager{display:flex;gap:8px;align-items:center;justify-content:flex-end;padding:12px 2px;color:var(--muted);font-size:13px}
.empty{padding:46px 10px;text-align:center;color:var(--muted)}

/* ---------- 弹窗 ---------- */
.modal-layer{position:fixed;inset:0;background:rgba(23,35,64,.42);display:flex;align-items:center;
  justify-content:center;z-index:60;padding:24px}
.modal{background:#fff;border-radius:14px;width:min(760px,100%);max-height:90vh;display:flex;flex-direction:column;
  box-shadow:0 20px 50px rgba(23,35,64,.22)}
.modal.wide{width:min(980px,100%)}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--line-2)}
.modal-head h3{margin:0;font-size:16px}
.modal-body{padding:18px 20px;overflow:auto}
.modal-foot{padding:14px 20px;border-top:1px solid var(--line-2);display:flex;justify-content:flex-end;gap:10px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-grid .full{grid-column:1 / -1}
.hint{color:var(--muted);font-size:12px;margin-top:4px}
.lang-picker{display:flex;flex-wrap:wrap;gap:6px;border:1px solid var(--line);border-radius:9px;padding:9px;max-height:168px;overflow:auto;background:#fbfcfe}
.lang-picker label{display:flex;align-items:center;gap:5px;font-size:12.5px;border:1px solid var(--line);
  border-radius:7px;padding:3px 8px;background:#fff;cursor:pointer;color:var(--text-2)}
.lang-picker input:checked + span{color:var(--blue-d);font-weight:600}
.lang-picker label.on{border-color:var(--blue);background:var(--blue-l)}
.kv{display:grid;grid-template-columns:96px 1fr;gap:8px 14px;font-size:13.5px}
.kv .k{color:var(--muted)}
.pre{background:#f8fafd;border:1px solid var(--line-2);border-radius:9px;padding:12px;
  white-space:pre-wrap;word-break:break-word;font-size:13px;max-height:280px;overflow:auto;font-family:inherit}
.reply{border:1px solid var(--line-2);border-radius:10px;padding:10px 12px;margin-bottom:8px;background:#fafcff}
.reply .meta{color:var(--muted);font-size:12px;margin-bottom:3px}
.file-drop{border:1.5px dashed #c9d6ea;border-radius:11px;padding:20px;text-align:center;background:#fafcff;cursor:pointer}
.file-drop.on{border-color:var(--blue);background:var(--blue-l)}
.file-drop .big{font-size:14px;font-weight:600}
.file-drop .muted{margin-top:4px}

/* ---------- 提示 ---------- */
.toast{position:fixed;left:50%;bottom:38px;transform:translateX(-50%);background:#22303f;color:#fff;
  padding:10px 18px;border-radius:10px;font-size:13.5px;z-index:80;box-shadow:0 8px 24px rgba(0,0,0,.2);max-width:70vw}
.toast.err{background:#b8453f}
.toast.ok{background:#2f7d55}

@media (max-width:860px){
  .sidebar{position:fixed;z-index:40;transform:translateX(-100%);transition:.2s}
  .form-grid{grid-template-columns:1fr}
}