/* 问卷作答版式：题头 + 题目卡片，选项为单选行/量表。仅作用于作答流程（非首页）。 */
body.in-study:not(.answering) .lab-main{max-width:720px}
body.in-study:not(.answering) .survey-stages{margin:2px 4px 18px}
body.in-study .card{border-radius:14px}
body.answering{background:var(--paper)}
body.answering::before{display:none}
body.answering .lab-main{max-width:780px}
body.answering .survey-stages{margin:2px 4px 22px}
.survey{display:grid;gap:14px}
.survey-head,.q-card{border-radius:12px}
.survey-head{background:var(--panel);border:1px solid var(--line);overflow:hidden;box-shadow:var(--shadow)}
.survey-cover{height:6px;background:var(--accent)}
.survey-head-body{padding:24px 32px}
.survey-head .title{font-size:24px;margin-bottom:0}
.survey-head .subtitle{margin-bottom:4px}
.survey-head .progress{margin:16px 0 0}
.q-card{background:var(--panel);border:1px solid var(--line);padding:26px 32px 28px;box-shadow:var(--shadow)}
.q-meta{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 12px;margin-bottom:20px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.q-no{font-size:12px;color:var(--accent);letter-spacing:.5px;background:var(--chip);padding:4px 10px;border-radius:4px}
.q-name{font-size:17px}
.q-hint{font-size:12px;color:var(--muted);flex-basis:100%}
.q-card .question{font-size:18px;margin-bottom:18px}
.q-card .actions{border-top:1px solid var(--line);padding-top:22px;margin-top:28px}
.q-card .btn{border-radius:7px;min-width:160px}
.q-card .option:has(input:checked){background:var(--chip);border-color:var(--accent)}
.q-card .option:has(input:focus-visible){outline:2px solid var(--focus);outline-offset:3px}
/* 选项行：自绘单选圆点 */
.q-card .options{gap:8px}
.q-card .option{border-radius:10px;padding:12px 16px;min-height:48px;background:var(--panel)}
.q-card .option input,.yesno .option input{appearance:none;-webkit-appearance:none;width:18px;height:18px;border:1.5px solid var(--muted);border-radius:50%;background:transparent;display:grid;place-items:center;flex-shrink:0;margin:0}
.q-card .option input::after,.yesno .option input::after{content:'';width:8px;height:8px;border-radius:50%;background:var(--accent);transform:scale(0);transition:transform .12s}
.q-card .option input:checked,.yesno .option input:checked{border-color:var(--accent)}
.q-card .option input:checked::after,.yesno .option input:checked::after{transform:scale(1)}
.q-card .option input:focus-visible,.yesno .option input:focus-visible{outline:2px solid var(--focus);outline-offset:3px}
.yesno .option{border-radius:10px}
/* 题目序号与必答标记 */
.q-card .items{gap:0;counter-reset:none}
.q-card .item{padding:0 0 26px;margin:0 0 26px;border-bottom:1px solid var(--line);scroll-margin-block:24px}
.q-card .item:first-child{padding-top:4px}.q-card .item:last-child{border:0;padding-bottom:0;margin-bottom:0}
.q-card .item legend{display:block;font-size:17px;line-height:1.9;padding-bottom:2px;overflow-wrap:anywhere}
.item-no{display:inline-block;margin-right:10px;color:var(--accent);font-size:14px;font-variant-numeric:tabular-nums}
.required-mark{color:var(--bad);margin-left:6px}
.required-label{margin-left:0;font-size:12px}
.item-type{color:var(--muted);font-size:12px;margin:0 0 18px}
.questionnaire-summary{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:12px;padding:0 0 18px}
.questionnaire-count{font-variant-numeric:tabular-nums}
.q-card .item-invalid legend,.q-card .item-invalid .item-type{color:var(--bad)}
.q-card .item-invalid textarea,.q-card .item-invalid .option{border-color:var(--bad)}
.likert-scroll{overflow-x:auto;padding:4px; margin-inline:-4px}
/* 李克特量表：圆点 + 数字，端点标签居两侧 */
.q-card .likert{gap:0;position:relative;padding:4px 0 0}
.q-card .likert::before{content:'';position:absolute;left:8%;right:8%;top:17px;border-top:1px solid var(--line)}
.q-card .likert label{border:0;background:transparent;min-height:54px;min-width:36px;display:flex;flex-direction:column;align-items:center;gap:6px;padding:0 0 4px;font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}
.likert-track:has(.likert-wide){min-width:max-content}
.q-card .likert-wide{grid-auto-columns:minmax(44px,1fr)}
.q-card .likert input{z-index:2}
.q-card .likert label::before{content:'';position:relative;z-index:1;width:26px;height:26px;border-radius:50%;border:1.5px solid var(--muted);background:var(--panel);transition:background .12s,border-color .12s,box-shadow .12s}
.q-card .likert label:hover::before{border-color:var(--accent)}
.q-card .likert label:has(input:checked){background:transparent;color:var(--ink)}
.q-card .likert label:has(input:checked)::before{background:var(--accent);border-color:var(--accent);box-shadow:inset 0 0 0 3px var(--panel)}
.q-card .likert-ends{margin-top:6px}
/* 文本题与把握度 */
.q-card textarea{border-radius:10px;background:var(--panel);min-height:150px}
.q-card textarea:focus{outline:2px solid var(--focus);outline-offset:1px}
.q-card .confidence{border-top:1px solid var(--line);border-style:solid none none;margin-top:22px;padding-top:18px}
.q-card .confidence label{font-size:14px}
.q-card .stimulus,.q-card .material,.q-card .advice,.q-card .evidence-item{border-radius:10px}
.q-card .advice{border-left-width:3px}
@media(max-width:600px){
  .survey-head-body{padding:20px 18px}.survey-head .title{font-size:21px}
  .q-card{padding:22px 18px}
  .q-card .likert::before{left:10%;right:10%}.q-card .likert label::before{width:22px;height:22px}.q-card .likert::before{top:15px}
  .q-card .item legend{font-size:15px}
}