/* ===== 答题页：题目卡片 ===== */
.quiz-card{
  max-width:760px;margin:0 auto;
  background:var(--card);
  border-radius:24px;
  box-shadow:var(--shadow);
  padding:34px 40px 30px;
  border:1px solid rgba(255,255,255,.6);
}
.progress-head{display:flex;align-items:center;gap:16px;margin-bottom:8px}
.progress-head .counter{font-size:13px;color:var(--ink-2);font-weight:500;white-space:nowrap}
.progress-head .counter b{color:var(--main);font-size:15px}
.progress-track{flex:1;height:6px;background:var(--main-soft);border-radius:99px;overflow:hidden}
.progress-fill{height:100%;width:0%;background:linear-gradient(90deg,var(--main),#4f7d70);border-radius:99px;transition:width .4s ease}
.q-dot{text-align:right;font-size:12px;color:var(--ink-3);margin-bottom:26px;letter-spacing:.05em}
.q-text{
  font-family:'Noto Serif SC',Georgia,serif;
  font-size:clamp(18px,2.4vw,21px);
  font-weight:600;line-height:1.7;
  margin-bottom:30px;min-height:76px;
  animation:qIn .35s ease both;
}
@keyframes qIn{from{opacity:0;transform:translateX(14px)}to{opacity:1;transform:none}}
.options{display:flex;flex-direction:column;gap:12px;animation:qIn .35s .06s ease both}
.opt{
  display:flex;align-items:center;gap:14px;
  border:1.5px solid var(--line);
  background:#fff;
  border-radius:14px;padding:14px 18px;
  cursor:pointer;transition:border-color .2s,background .2s,transform .12s;
}
.opt:hover{border-color:var(--main);background:var(--main-soft);transform:translateX(3px)}
.opt.sel{border-color:var(--main);background:var(--main-soft);box-shadow:inset 0 0 0 1px var(--main)}
.opt .radio{
  width:20px;height:20px;border-radius:50%;
  border:2px solid var(--ink-3);flex:none;
  display:flex;align-items:center;justify-content:center;
  transition:border-color .2s,background .2s;
}
.opt.sel .radio{border-color:var(--main);background:var(--main)}
.opt.sel .radio::after{content:'';width:7px;height:7px;border-radius:50%;background:#fff}
.opt .txt{font-size:15px;font-weight:500}
.opt .val{margin-left:auto;font-size:12px;color:var(--ink-3);white-space:nowrap}
.opt.sel .val{color:var(--main);font-weight:500}
.quiz-nav{display:flex;justify-content:space-between;align-items:center;margin-top:30px}
.qnav-btn{
  display:inline-flex;align-items:center;gap:8px;
  background:transparent;border:1.5px solid var(--line);
  border-radius:12px;padding:10px 20px;font-family:inherit;
  font-size:14.5px;color:var(--ink-2);cursor:pointer;transition:all .2s;
}
.qnav-btn:hover:not(:disabled){border-color:var(--main);color:var(--main)}
.qnav-btn:disabled{opacity:.35;cursor:not-allowed}
.qnav-btn svg{width:16px;height:16px}
.qnav-next{background:var(--main);border-color:var(--main);color:#fff;box-shadow:0 6px 16px rgba(46,92,81,.25)}
.qnav-next:hover:not(:disabled){background:var(--main-deep);color:#fff}
.qnav-spacer{width:108px}

/* ===== 答题页响应式 ===== */
@media (max-width:860px){
  .quiz-card{padding:26px 20px 22px}
  .q-text{min-height:0}
  .qnav-spacer{display:none}
  .quiz-nav .qnav-btn{flex:1;justify-content:center}
}