:root{
  --primary:#3576e0;
  --primary-dark:#1e4fae;
  --primary-light:#eaf2fd;
  --bg:#f5f8fc;
  --card:#ffffff;
  --border:#d7e6fa;
  --text:#3a3a3a;
  --sub:#7c8a99;
  --danger:#e0435c;
  --success:#3fb17c;
  --radius:16px;
}
*{box-sizing:border-box;}
body{margin:0;padding:0;}
html,body{
  font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic",-apple-system,BlinkMacSystemFont,sans-serif;
  background:var(--bg);
  color:var(--text);
  font-size:16px;
  line-height:1.6;
}
.app{max-width:640px;margin:0 auto;padding:0 0 60px;}

/* Header */
header.topbar{
  background:linear-gradient(135deg,var(--primary),#6fa8f0);
  color:#fff;
  padding:22px 20px 18px;
  border-radius:0 0 24px 24px;
  box-shadow:0 4px 14px rgba(31,79,174,.25);
}
header.topbar .logo{
  font-size:19px;
  font-weight:700;
  text-align:center;
  margin-bottom:16px;
}
.steps{display:flex;justify-content:space-between;gap:6px;}
.step-item{
  flex:1;
  text-align:center;
  opacity:.55;
  font-size:12px;
}
.step-item.active{opacity:1;}
.step-item .num{
  display:inline-flex;align-items:center;justify-content:center;
  width:26px;height:26px;border-radius:50%;
  background:rgba(255,255,255,.25);
  font-weight:700;margin-bottom:4px;
}
.step-item.active .num{background:#fff;color:var(--primary-dark);}
.step-item .label{display:block;}

main{padding:18px 16px 0;}
.step-panel{display:none;}
.step-panel.active{display:block;animation:fadeIn .25s ease;}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px);}to{opacity:1;transform:none;}}

.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:18px 16px;
  margin-bottom:16px;
  box-shadow:0 2px 8px rgba(0,0,0,.03);
}
.card h2{
  font-size:16px;
  margin:0 0 14px;
  display:flex;align-items:center;gap:6px;
  color:var(--primary-dark);
}
.card h3{
  font-size:14px;
  margin:18px 0 8px;
  color:var(--primary-dark);
  border-left:4px solid var(--primary);
  padding-left:8px;
}
.sub-note{font-size:12px;color:var(--sub);margin:4px 0 0;}

/* qty rows */
.qty-row{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 0;
  border-bottom:1px solid var(--border);
}
.qty-row:last-child{border-bottom:none;}
.qty-title{font-weight:600;font-size:14.5px;}
.qty-price{font-size:13px;color:var(--sub);margin-top:2px;}
.qty-control{display:flex;align-items:center;gap:10px;}
.qty-btn{
  width:34px;height:34px;border-radius:50%;
  border:1px solid var(--primary);
  background:#fff;color:var(--primary);
  font-size:18px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;user-select:none;
  transition:background .15s;
}
.qty-btn:active{background:var(--primary-light);}
.qty-btn:disabled{opacity:.35;cursor:not-allowed;background:#fff;}
.qty-value{
  min-width:26px;text-align:center;font-weight:700;font-size:16px;
}

/* options */
.option-row{
  display:flex;align-items:center;gap:10px;
  padding:11px 10px;
  border:1px solid var(--border);
  border-radius:12px;
  margin-bottom:8px;
  cursor:pointer;
  transition:background .15s,border-color .15s;
}
.option-row:has(input:checked){
  background:var(--primary-light);
  border-color:var(--primary);
}
.option-row input[type="checkbox"]{
  width:19px;height:19px;accent-color:var(--primary);flex-shrink:0;
}
.option-row input:disabled{accent-color:#ccc;}
.option-row.disabled{opacity:.45;cursor:not-allowed;}
.opt-text{flex:1;font-size:14px;}
.opt-sub{font-size:11.5px;color:var(--sub);display:block;margin-top:1px;}
.opt-price{font-size:13.5px;font-weight:700;color:var(--primary-dark);white-space:nowrap;}

.combo-box{
  background:#f3f8ff;
  border:1px dashed var(--primary);
  border-radius:12px;
  padding:4px;
  margin-top:10px;
}

/* total bar */
.total-bar{
  background:linear-gradient(135deg,#fff,var(--primary-light));
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:16px;
  text-align:center;
  margin-bottom:16px;
}
.total-bar .ttl-label{font-size:13px;color:var(--sub);}
.total-bar .ttl-amount{
  font-size:32px;font-weight:800;color:var(--primary-dark);
  margin:4px 0;
}
.total-bar .ttl-note{font-size:12px;color:var(--sub);}

.summary-mini{
  display:flex;justify-content:space-between;align-items:center;
  background:var(--primary-light);
  border-radius:12px;
  padding:12px 14px;
  margin-bottom:16px;
  position:sticky;top:8px;
  z-index:5;
}
.summary-mini .lbl{font-size:12.5px;color:var(--sub);}
.summary-mini .val{font-size:20px;font-weight:800;color:var(--primary-dark);}

/* buttons */
.btn-primary{
  display:block;width:100%;
  background:var(--primary);
  color:#fff;border:none;
  padding:15px;border-radius:30px;
  font-size:15.5px;font-weight:700;
  cursor:pointer;
  box-shadow:0 4px 10px rgba(31,79,174,.3);
  transition:background .15s,transform .1s;
}
.btn-primary:hover{background:var(--primary-dark);}
.btn-primary:active{transform:scale(.98);}
.btn-secondary{
  display:block;width:100%;
  background:transparent;
  color:var(--sub);border:1px solid var(--border);
  padding:13px;border-radius:30px;
  font-size:14px;font-weight:600;
  cursor:pointer;margin-top:10px;
}
.btn-secondary:hover{background:#f4eef0;}

/* form fields */
label.field-label{
  display:block;font-size:13.5px;font-weight:700;margin:14px 0 6px;
}
label.field-label .req{
  color:#fff;background:var(--danger);
  font-size:10.5px;font-weight:700;
  padding:2px 6px;border-radius:6px;margin-left:6px;vertical-align:1px;
}
label.field-label .opt-tag{
  color:var(--sub);
  font-size:10.5px;font-weight:600;
  border:1px solid var(--border);
  padding:2px 6px;border-radius:6px;margin-left:6px;vertical-align:1px;
}
input[type="text"],input[type="tel"],input[type="email"],input[type="number"],
select,textarea{
  width:100%;
  padding:12px 12px;
  border:1px solid var(--border);
  border-radius:10px;
  font-size:15px;
  background:#fff;
  color:var(--text);
  font-family:inherit;
}
input:focus,select:focus,textarea:focus{
  outline:none;border-color:var(--primary);
  box-shadow:0 0 0 3px var(--primary-light);
}
textarea{resize:vertical;min-height:90px;}
.field-error{
  display:none;color:var(--danger);font-size:12px;margin-top:4px;
}
.field-error.show{display:block;}
input.invalid,select.invalid{border-color:var(--danger);background:#fff5f6;}

.zip-row{display:flex;gap:8px;}
.zip-row input{flex:1;}
.zip-row button{
  flex-shrink:0;
  padding:0 14px;
  border:1px solid var(--primary);
  background:#fff;color:var(--primary);
  border-radius:10px;font-size:13px;font-weight:700;
  cursor:pointer;white-space:nowrap;
}
.zip-row button:hover{background:var(--primary-light);}
.zip-status{font-size:12px;margin-top:5px;}
.zip-status.ok{color:var(--success);}
.zip-status.ng{color:var(--danger);}

.notice-box{
  background:#fff6ea;border:1px solid #f0dcb0;
  border-radius:12px;padding:12px 14px;
  font-size:12.5px;color:#7a6534;margin-bottom:12px;
}
.notice-box p{margin:3px 0;}
.notice-box.pink{background:var(--primary-light);border-color:var(--border);color:#2c4d78;}

.check-grid{
  display:flex;flex-wrap:wrap;gap:8px;
}
.chip{
  display:flex;align-items:center;gap:5px;
  border:1px solid var(--border);
  border-radius:20px;padding:8px 12px;
  font-size:13.5px;cursor:pointer;
}
.chip:has(input:checked){
  background:var(--primary);color:#fff;border-color:var(--primary);
}
.chip input{accent-color:var(--primary);}
.chip.day{padding:8px 10px;min-width:42px;justify-content:center;}
.chip.day input{display:none;}

.radio-pair{display:flex;gap:8px;margin-top:6px;flex-wrap:wrap;}
.radio-pair label{
  flex:1;min-width:150px;
  display:flex;align-items:center;gap:6px;
  border:1px solid var(--border);border-radius:10px;
  padding:10px 12px;font-size:13.5px;cursor:pointer;
}
.radio-pair label:has(input:checked){
  background:var(--primary-light);border-color:var(--primary);font-weight:700;
}
.radio-pair input{accent-color:var(--primary);}

fieldset{border:none;padding:0;margin:0;}
legend{padding:0;}

.pref-block{
  border:1px solid var(--border);border-radius:14px;padding:14px;margin-bottom:14px;
}
.pref-block h4{margin:0 0 10px;font-size:14px;color:var(--primary-dark);}

.complete-box{text-align:center;padding:30px 10px;}
.complete-box .emoji{font-size:52px;}
.complete-box h2{color:var(--primary-dark);margin:10px 0;}
.recap{
  text-align:left;background:#fff;border:1px solid var(--border);
  border-radius:14px;padding:14px 16px;margin:18px 0;font-size:13.5px;
}
.recap div{padding:5px 0;border-bottom:1px dashed var(--border);}
.recap div:last-child{border-bottom:none;}
.recap b{color:var(--primary-dark);}

@media (min-width:600px){
  .qty-title{font-size:15.5px;}
  .card h2{font-size:17px;}
}