* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background-color: #f1f5f9;
  font-family: system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color: #333;
}
main {
  flex-grow: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}
h1 {
  color: #2563eb;
  font-size: 30px;
  font-weight: 700;
  text-align: center;
  margin-top: 35px;
}
.desc {
  text-align: center;
  color: #4b5563;
  margin-top: 8px;
  margin-bottom: 20px;
}
.intro-card {
  background:#ffffff;
  border-radius:8px;
  padding:16px 20px;
  margin-bottom:20px;
  box-shadow:0 2px 8px rgba(0,0,0,0.06);
}
.intro-card h3 {
  font-size:16px;
  margin-bottom:8px;
  color:#1e293b;
}
.intro-card p {
  font-size:14px;
  line-height:1.7;
  color:#475569;
}
.card {
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  padding: 0;
  margin-bottom: 20px;
  overflow:hidden;
}
table {
  width: 100%;
  border-collapse: collapse;
}
td {
  border:1px solid #d0d7de;
  padding:10px 12px;
}
td:nth-child(odd){
  background:#f7f8fa;
  font-weight:500;
  color:#222;
}
tbody tr:nth-child(even) td {
  background-color:#fcfcfd;
}
tbody tr:hover td{
  background-color:#e8f4ff;
}
.result-row td{
  background:#eff6ff !important;
  font-weight:500;
}
.input-wrap {
  display: flex;
  align-items: center;
  gap:8px;
}
.input-wrap input {
  flex:1;
}
.unit-text{
  color:#555;
  white-space:nowrap;
  font-size:14px;
}
input[type="number"] {
  border:1px solid #b9bfc7;
  border-radius:0px;
  padding:7px 10px;
  font-size:14px;
  background:#fff;
}
input[type="number"]:focus {
  outline: none;
  border-color:#2563eb;
  box-shadow: 0 0 0 1px #2563eb;
}
/*手机表格适配 */
@media (max-width:768px) {
  table tr {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}
.btn-wrap {
  display: flex;
  gap:12px;
  margin:20px 0;
}
@media(max-width:640px){
  .btn-wrap{
    flex-direction: column;
  }
}
button {
  flex:1;
  padding:12px;
  border-radius:6px;
  border:none;
  font-size:16px;
  cursor:pointer;
}
.btn-reset{
  background-color:#e5e7eb;
  color:#333;
}
.btn-copy{
  background:#10b981;
  color:#fff;
}
.btn-export{
  background:#f59e0b;
  color:#fff;
}
.btn-share{
  background:#6366f1;
  color:#fff;
}
.warn-text{
  color:#dc2626;
}
.disclaimer{
  font-size:13px;
  color:#666;
  line-height:1.6;
  padding:16px;
  background:#f8fafc;
  border-radius:8px;
  margin-bottom:24px;
}
footer {
  padding: 24px 0;
  text-align: center;
  font-size: 14px;
  color: #6b7280;
}
/*广告样式（预留）*/
.ad-box{
  background:#fefce8;
  border:1px solid #fef08a;
  border-radius:8px;
  padding:12px 16px;
  margin:16px 0;
  font-size:14px;
}
.ad-label{
  font-size:12px;
  color:#ca8a04;
  margin-right:8px;
}
.ad-box a{
  color:#1d4ed8;
  text-decoration:none;
}
.ad-box a:hover{
  text-decoration:underline;
}
/*打印样式 */
@media print {
  body {
    background:#fff;
  }
  .btn-wrap, footer,.ad-box {
    display:none !important;
  }
  .card {
    box-shadow:none;
  }
  h1 {
    color:#000;
  }
  @media (max-width:768px) {
    table tr {
      display:table-row;
    }
  }
}