:root{
  --bg:#f6f7f9; --card:#fff; --ink:#1f2430; --muted:#6b7280; --line:#e6e8ec;
  --brand:#2f6f4f; --brand-soft:#e8f3ec; --accent:#c0392b; --warn:#b7791f;
  --radius:12px; --shadow:0 1px 3px rgba(20,30,40,.07),0 6px 18px rgba(20,30,40,.04);
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);
  font:15px/1.6 -apple-system,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;}
.topbar{display:flex;align-items:baseline;gap:14px;padding:14px 24px;background:var(--card);
  border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.brand{font-size:18px;font-weight:700;cursor:pointer;color:var(--brand)}
.sub{color:var(--muted);font-size:13px}
main{max-width:1080px;margin:0 auto;padding:24px}

h1{font-size:22px;margin:0 0 4px}
h2{font-size:17px;margin:0 0 14px}
h3{font-size:15px;margin:18px 0 8px;color:var(--muted);font-weight:600;
  text-transform:none;letter-spacing:.02em}
.muted{color:var(--muted)}
.hint{color:var(--muted);font-size:12px}
.err{color:var(--accent);font-size:13px;margin-top:8px;white-space:pre-wrap}

button{font:inherit;cursor:pointer;border-radius:8px;border:1px solid var(--line);
  padding:8px 14px;background:#fff;transition:.15s}
button:hover{border-color:#c7ccd4}
button.primary{background:var(--brand);color:#fff;border-color:var(--brand)}
button.primary:hover{filter:brightness(1.06)}
button.ghost{background:#fff}
button.danger{color:var(--accent);border-color:#f0cfca}
.link-btn{border:none;background:none;color:var(--brand);padding:4px 0;font-size:13px}
button:disabled{opacity:.5;cursor:not-allowed}

.toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}

/* 作业卡片列表 */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}
.card{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px;box-shadow:var(--shadow);cursor:pointer;transition:.15s}
.del-btn{position:absolute;top:8px;right:10px;border:none;background:none;color:#c2c8d0;
  font-size:15px;cursor:pointer;padding:2px 6px;line-height:1;border-radius:6px}
.del-btn:hover{color:#fff;background:var(--accent)}
.del-btn-sm{position:absolute;top:5px;left:5px;width:26px;height:26px;border:none;border-radius:6px;
  background:rgba(20,25,35,.55);color:#fff;font-size:13px;line-height:1;cursor:pointer;padding:0}
.del-btn-sm:hover{background:var(--accent)}
.card:hover{transform:translateY(-2px);border-color:#cdd3db}
.card .title{font-weight:600;margin-bottom:6px}
.card .snippet{color:var(--muted);font-size:13px;height:42px;overflow:hidden}
.card .meta{margin-top:10px;font-size:12px;color:var(--muted);display:flex;gap:12px}

/* 作业详情 */
.back{color:var(--brand);cursor:pointer;font-size:13px;margin-bottom:10px;display:inline-block}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;box-shadow:var(--shadow);margin-bottom:18px}
.prompt-box{white-space:pre-wrap;background:#fbfbfc;border:1px solid var(--line);
  border-radius:8px;padding:12px;max-height:200px;overflow:auto;font-size:14px}
.guide-box{background:var(--brand-soft);border-color:#cfe4d7}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.chip{background:var(--brand-soft);color:var(--brand);border-radius:999px;
  padding:3px 12px;font-size:13px}

/* 上传区 */
.uploader{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
input[type=text],input[type=number],textarea,input:not([type]){
  font:inherit;border:1px solid var(--line);border-radius:8px;padding:8px 10px;width:100%}
textarea{resize:vertical}
.file-btn{display:inline-block;background:var(--brand-soft);color:var(--brand);
  border-radius:8px;padding:8px 14px;cursor:pointer;font-size:14px}

/* 拖拽上传区 */
.dropzone{position:relative;display:block;border:2px dashed #c7d0cb;border-radius:12px;
  padding:26px;text-align:center;cursor:pointer;background:#fbfdfc;transition:.15s}
.dropzone:hover,.dropzone.drag{border-color:var(--brand);background:var(--brand-soft)}
.dz-big{font-size:16px;font-weight:600;color:var(--brand);margin-bottom:4px}
/* 透明真实 input 铺满整个拖拽框,点哪儿都等于点它 */
.dz-input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer}

/* 作文列表 */
.essays{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin-top:6px}
.essay-pill{border:1px solid var(--line);border-radius:10px;padding:0 0 10px;cursor:pointer;background:#fff;overflow:hidden}
.essay-pill:hover{border-color:#c7ccd4}
.essay-pill.sel{border-color:var(--brand);box-shadow:0 0 0 2px var(--brand-soft)}
.thumb-wrap{position:relative}
.essay-pill .thumb{width:100%;height:96px;object-fit:cover;display:block;background:#f0f1f3}
.rot-btn{position:absolute;top:5px;right:5px;width:26px;height:26px;border:none;border-radius:6px;
  background:rgba(20,25,35,.55);color:#fff;font-size:14px;line-height:1;cursor:pointer;padding:0}
.rot-btn:hover{background:rgba(20,25,35,.85)}
.essay-pill .lab{font-weight:600;font-size:14px;padding:8px 12px 0}
.essay-pill .st{font-size:12px;margin-top:4px;padding:0 12px}
.score-big{font-size:20px;font-weight:700;color:var(--brand)}
.st-pending,.st-transcribing,.st-grading{color:var(--warn)}
.st-error{color:var(--accent)}
.st-done{color:var(--brand)}
.spinner{display:inline-block;width:10px;height:10px;border:2px solid #ddd;
  border-top-color:var(--warn);border-radius:50%;animation:spin .8s linear infinite;margin-right:5px;vertical-align:-1px}
@keyframes spin{to{transform:rotate(360deg)}}

/* 详情面板 */
.detail{display:grid;grid-template-columns:300px 1fr;gap:22px;align-items:start}
@media(max-width:820px){.detail{grid-template-columns:1fr}}
.imgs img{width:100%;height:auto;border:1px solid var(--line);border-radius:8px;margin-bottom:8px;display:block}
.transcript-col textarea{width:100%;line-height:1.8}
.scores{margin-top:20px}
.scores table{width:100%;border-collapse:collapse;font-size:14px}
.scores td{padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:top}
.scores td.dim{font-weight:600;white-space:nowrap;width:64px}
.scores td.sc{white-space:nowrap;width:70px}
.scores td.sc b{color:var(--brand);font-size:17px}
.scores .total td{border-top:2px solid var(--line);background:#fbfdfc}
.scores .total td.sc b{font-size:20px}
.overall{background:var(--brand-soft);border-radius:8px;padding:14px 16px;margin:4px 0 16px;white-space:pre-wrap;line-height:1.7}

/* 洞察 */
.insights .stat{display:inline-block;background:#fbfbfc;border:1px solid var(--line);
  border-radius:8px;padding:8px 14px;margin:4px 8px 4px 0}
.insights .stat b{font-size:18px;color:var(--brand)}
.dist-bar{display:flex;align-items:center;gap:8px;margin:4px 0;font-size:13px}
.dist-bar .bar{height:14px;background:var(--brand);border-radius:3px;min-width:2px}
.issue{padding:6px 0;border-bottom:1px dashed var(--line)}
.pick{padding:8px 0;border-bottom:1px dashed var(--line)}
.pick .tag{font-size:12px;border-radius:4px;padding:1px 7px;margin-right:8px}
.tag-范文{background:var(--brand-soft);color:var(--brand)}
.tag-典型问题{background:#fdecea;color:var(--accent)}

/* 弹窗 */
.modal{position:fixed;inset:0;background:rgba(20,25,35,.45);display:flex;
  align-items:flex-start;justify-content:center;padding:40px 16px;z-index:10;overflow:auto}
.modal-card{background:#fff;border-radius:14px;padding:24px;width:560px;max-width:100%;box-shadow:var(--shadow)}
.modal-card label{display:block;margin:12px 0 0;font-size:14px;font-weight:600}
.modal-card label input,.modal-card label textarea{margin-top:6px;font-weight:400}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:18px}
.row{display:flex;align-items:center;gap:12px;margin-top:10px}
.dims{display:flex;flex-direction:column;gap:8px;margin-top:10px}
.dim-row{display:flex;gap:8px;align-items:center}
.dim-row input.dn{flex:1}
.dim-row input.dm{width:80px}
.hidden{display:none!important}

/* 登录页 */
.login-screen{position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;padding:20px;
  background:linear-gradient(135deg,#e8f3ec 0%,#f4f8f5 45%,#eef2f5 100%)}
.login-card{width:380px;max-width:92vw;background:#fff;border-radius:18px;padding:44px 38px 36px;
  box-shadow:0 12px 44px rgba(20,50,35,.14);text-align:center}
.login-logo{font-size:40px;line-height:1}
.login-brand{font-size:23px;font-weight:800;color:var(--brand);margin-top:10px}
.login-sub{color:var(--muted);font-size:13px;margin:6px 0 30px}
.login-input{width:100%;padding:13px 14px;font-size:15px;border:1px solid var(--line);
  border-radius:10px;text-align:center;letter-spacing:1px;transition:.15s}
.login-input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.login-submit{width:100%;margin-top:16px;padding:13px;font-size:16px;font-weight:600;letter-spacing:4px;
  background:var(--brand);color:#fff;border:none;border-radius:10px;cursor:pointer;transition:.15s}
.login-submit:hover{filter:brightness(1.07)}
.login-card .err{margin-top:14px;text-align:center}