/* ===================== 算法说明 ===================== */
.algo-desc { font-size:13px; color:#444; background:#e3f2fd; padding:8px 12px; border-radius:6px; border-left:3px solid #1565c0; line-height:1.5 }

/* 按钮激活态 */
.btn-primary.active { background:#0d47a1; box-shadow:0 2px 6px rgba(21,101,192,.4) }
.btn-outline.active { background:#e3f2fd; border-color:#0d47a1; color:#0d47a1 }

/* ===================== 通用样式 ===================== */

*{box-sizing:border-box;margin:0;padding:0}
.wrap{max-width:1600px;margin:0 auto;padding:16px}
.card{background:#fff;border-radius:10px;box-shadow:0 2px 12px rgba(21,101,192,.1);margin-bottom:16px;overflow:hidden}
.card-title{background:linear-gradient(135deg,#1565c0,#0d47a1);color:#fff;padding:10px 16px;font-size:15px;font-weight:bold}
.card-body{padding:16px}
.row{display:flex;gap:12px;flex-wrap:wrap}
.col{flex:1;min-width:220px}
.lbl{font-size:12px;color:#555;margin-bottom:4px}
.lbl span{color:#c62828}
input,select{width:100%;padding:8px 10px;border:1.5px solid #ccc;border-radius:6px;font-size:14px;transition:border .2s,box-shadow .2s}
input:focus,select:focus{outline:none;border-color:#1565c0;box-shadow:0 0 0 3px rgba(21,101,192,.12)}
.row2{display:flex;gap:16px;flex-wrap:wrap;margin-top:8px}
.fgroup{width:200px}
.fgroup label{font-size:12px;color:#555;display:block;margin-bottom:4px}
.result-box{background:#f8f9fa;border:2px solid #1565c0;border-radius:8px;padding:14px 16px;margin-top:12px}
.result-box h3{font-size:14px;color:#1565c0;margin-bottom:10px}
.result-main{font-size:36px;color:#c62828;font-weight:bold;line-height:1.2}
.result-main span{font-size:16px;color:#555;margin-left:8px}
.result-detail{display:grid;grid-template-columns:1fr 1fr;gap:8px 24px;margin-top:12px}
.result-item{display:flex;justify-content:space-between;font-size:13px;padding:4px 0;border-bottom:1px solid #eee}
.result-item .k{color:#888}
.result-item .v{font-weight:bold;color:#333}
.result-item .v.highlight{color:#c62828;font-size:15px}
.btn-row{display:flex;gap:12px;margin-top:14px;flex-wrap:wrap}
.btn{padding:10px 20px;border:none;border-radius:6px;font-size:14px;cursor:pointer;font-weight:bold;transition:all .2s}
.btn-primary{background:#1565c0;color:#fff}
.btn-primary:hover{background:#0d47a1}
.btn-success{background:#2e7d32;color:#fff}
.btn-success:hover{background:#1b5e20}
.btn-outline{background:#fff;color:#1565c0;border:2px solid #1565c0}
.btn-outline:hover{background:#e3f2fd}
.error-msg{color:#c62828;font-size:12px;margin-top:4px;display:none}
.calculation-steps{background:#f8f9fa;border-radius:8px;padding:12px 16px;margin-top:16px;font-size:13px}
.calculation-steps h4{font-size:13px;color:#1565c0;margin-bottom:8px}
.step-item{margin:6px 0;line-height:1.6}
.step-item .formula{font-family:'Consolas','Courier New',monospace;background:#e3f2fd;padding:2px 6px;border-radius:4px;font-size:12px}
.tip{font-size:12px;color:#888;margin-top:8px;line-height:1.5}
.info-tag{display:inline-block;background:#e3f2fd;color:#1565c0;font-size:11px;padding:2px 8px;border-radius:4px;margin-left:8px}
.ref-info{font-size:12px;color:#555;background:#fff8e1;padding:8px 12px;border-radius:6px;margin-top:10px;border-left:3px solid #f57c00}
.ref-info code{font-size:11px;font-family:Consolas,monospace}
input[type=number]::-webkit-inner-spin-button,input[type=number]::-webkit-outer-spin-button{-webkit-appearance:none}