.study-wrap{ max-width:640px; margin:0 auto; padding:48px 24px 90px; }

.study-card{ background:#fff; border:1px solid var(--border); border-radius:20px; box-shadow:var(--shadow); padding:40px; }

.study-progress-head{ display:flex; justify-content:space-between; align-items:center; margin-bottom:10px; font-size:13px; color:var(--text-muted); font-weight:600; }
.study-progress-track{ height:6px; background:var(--accent-light); border-radius:99px; overflow:hidden; margin-bottom:36px; }
.study-progress-fill{ height:100%; background:var(--accent); border-radius:99px; transition:width .3s ease; width:14.28%; }

.study-step{ display:none; }
.study-step.active{ display:block; animation:study-fade .25s ease; }
@keyframes study-fade{ from{ opacity:0; transform:translateY(6px); } to{ opacity:1; transform:translateY(0); } }

.study-step h2{ font-size:22px; font-weight:800; letter-spacing:-0.01em; margin:0 0 6px; }
.study-step .hint{ color:var(--text-muted); font-size:14px; margin:0 0 24px; }

.study-row-2{ display:grid; grid-template-columns:1fr 1fr; gap:14px; }

.study-choice{ display:block; border:1px solid var(--border); border-radius:12px; padding:14px 16px; margin-bottom:10px; cursor:pointer; transition:border-color .15s, background .15s; }
.study-choice:hover{ border-color:var(--accent); }
.study-choice input{ display:none; }
.study-choice .choice-title{ font-weight:600; font-size:15px; }
.study-choice .choice-sub{ font-size:13px; color:var(--text-muted); margin-top:2px; }
.study-choice.selected{ border-color:var(--accent); background:var(--accent-light); }

.study-consent{ display:flex; gap:10px; align-items:flex-start; font-size:13.5px; color:var(--text-muted); margin:18px 0 8px; }
.study-consent input{ margin-top:3px; }
.study-consent a{ color:var(--accent); }

.study-nav-row{ display:flex; justify-content:space-between; align-items:center; margin-top:28px; }
.study-btn-ghost{ background:transparent; border:none; color:var(--text-muted); font-family:var(--font); font-weight:500; font-size:15px; cursor:pointer; padding:13px 0; }
.study-btn-ghost:hover{ color:var(--text); }

.study-success{ text-align:center; padding:20px 0; }
.study-success .icon{
  width:56px; height:56px; border-radius:50%; background:var(--accent-light); color:var(--accent);
  font-size:28px; display:flex; align-items:center; justify-content:center; margin:0 auto 20px;
}
.study-success h2{ font-size:22px; margin-bottom:10px; }
.study-success p{ color:var(--text-muted); font-size:15px; }

.study-alert{ --danger:#B42318; }
.study-alert:empty{ display:none; }
.study-alert{
  margin:0 0 22px; padding:13px 16px; border-radius:12px;
  font-size:14px; line-height:1.5;
}
.study-alert-error{ background:#FEF3F2; border:1px solid #FDA29B; color:#B42318; }

.study-nav-row button[disabled]{ opacity:.6; cursor:progress; }

@media (max-width:520px){
  .study-card{ padding:28px 20px; }
  .study-row-2{ grid-template-columns:1fr; }
}