:root{
  --bg:#f6f7fb;
  --card:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --line:#e5e7eb;
  --primary:#2563eb;
  --primary-weak:#dbeafe;
  --danger:#dc2626;
  --shadow: 0 12px 30px rgba(0,0,0,.08);
  --radius: 16px;
}

.sever-wrap{
  background: var(--bg);
  padding: 28px 12px;
}

.sever-card{
  max-width: 820px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.sever-header{
  padding: 22px 22px 10px 22px;
  border-bottom: 1px solid var(--line);
}

.sever-title{
  margin: 0;
  font-size: 24px;
  color: var(--text);
  letter-spacing: -0.3px;
}

.sever-subtitle{
  margin: 8px 0 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.sever-section{
  padding: 18px 22px;
}

.sever-form .sever-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.sever-field label{
  display:block;
  font-size: 13px;
  color: var(--text);
  margin-bottom: 8px;
  font-weight: 600;
}

.sever-field input{
  width: 100%;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
  background: #fff;
}

.sever-field input:focus{
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

.hint{
  display:block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--muted);
}

.input-with-unit{
  display:flex;
  align-items:center;
  gap: 10px;
}

.input-with-unit input{
  flex: 1;
}

.unit{
  min-width: 30px;
  color: var(--muted);
  font-size: 13px;
}

.sever-actions{
  display:flex;
  justify-content:flex-end;
  margin-top: 16px;
}

.btn{
  height: 44px;
  padding: 0 16px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 700;
  font-size: 14px;
}

.btn.primary{
  background: var(--primary);
  color: #fff;
}

.btn.primary:hover{
  filter: brightness(0.97);
}

.btn.ghost{
  background: #fff;
  border-color: var(--line);
  color: var(--text);
}

.btn.ghost:hover{
  background: #fafafa;
}

.sever-error{
  margin-top: 12px;
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid rgba(220,38,38,.25);
  background: rgba(220,38,38,.06);
  color: var(--danger);
  font-size: 13px;
  line-height: 1.5;
}

.result-box{
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 16px;
  background: #fff;
}

.result-row{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding: 10px 6px;
  border-bottom: 1px dashed var(--line);
}

.result-row:last-of-type{
  border-bottom: none;
}

.result-row .label{
  color: var(--muted);
  font-size: 13px;
}

.result-row .value{
  color: var(--text);
  font-weight: 700;
}

.result-total{
  margin-top: 14px;
  padding: 14px 14px;
  border-radius: 14px;
  background: var(--primary-weak);
  border: 1px solid rgba(37,99,235,.18);
}

.total-label{
  color: #1e3a8a;
  font-weight: 800;
  font-size: 13px;
}

.total-value{
  margin-top: 6px;
  font-size: 26px;
  font-weight: 900;
  color: #1e3a8a;
  letter-spacing: -0.5px;
}

.total-note{
  margin-top: 6px;
  font-size: 12px;
  color: #1e3a8a;
  opacity: .9;
  line-height: 1.5;
}

.ref{
  border-top: 1px solid var(--line);
  background: #fcfcfd;
}

.ref-title{
  margin: 0 0 10px 0;
  font-size: 16px;
  color: var(--text);
}

.ref-block{
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  padding: 14px 14px;
  margin-top: 10px;
}

.ref-block h3{
  margin: 0 0 8px 0;
  font-size: 14px;
  color: var(--text);
}

.ref-block ul{
  margin: 0;
  padding-left: 18px;
  color: var(--text);
}

.ref-block li{
  margin: 6px 0;
  color: #374151;
  line-height: 1.6;
  font-size: 13px;
}

.ref-disclaimer{
  margin: 0;
  color: #374151;
  line-height: 1.7;
  font-size: 13px;
}

@media (max-width: 820px){
  .sever-form .sever-grid{
    grid-template-columns: 1fr;
  }
  .sever-actions{
    justify-content:stretch;
  }
  .btn{
    width: 100%;
  }
}