:root{--navy:#0b2545;--blue:#1467c8;--blue2:#2a8bf0;--orange:#ff8a1e;--text:#243b53;--muted:#62748a;--line:#dce6f0;--soft:#f3f7fb;--green:#0e9f5d;--red:#c33b32;}
*{box-sizing:border-box;margin:0;padding:0;}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:#f7fafc;line-height:1.6;}
a{text-decoration:none;color:inherit;}
button,input,select,textarea{font:inherit;}
.container{width:min(1120px,92%);margin:0 auto;}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);backdrop-filter:blur(8px);}
.header-inner{height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px;}
.logo{display:flex;align-items:center;flex:0 0 auto;}
.logo img{display:block;height:44px;width:auto;}
.top-nav{display:flex;align-items:center;gap:20px;font-size:14px;font-weight:600;}
.top-nav>a:not(.btn):hover{color:var(--blue);}
.lang-link{border:1px solid var(--line);border-radius:7px;padding:4px 10px;}
.btn{border:0;border-radius:8px;background:linear-gradient(135deg,var(--blue2),var(--blue));color:#fff;padding:11px 22px;font-weight:700;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:transform .15s,box-shadow .15s;}
.btn:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(20,103,200,.2);}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none;}
.btn-small{padding:8px 16px;font-size:13px;}
.btn-light{background:#edf4fb;color:var(--navy);border:1px solid var(--line);}
.btn-light:hover{box-shadow:none;background:#e3eef8;}
.btn-text{background:transparent;color:var(--muted);padding-left:10px;padding-right:10px;}
.btn-text:hover{box-shadow:none;color:var(--red);}
.calc-hero{background:linear-gradient(135deg,#0b2545 0%,#123f70 65%,#1467c8 100%);color:#fff;padding:48px 0 52px;}
.eyebrow{text-transform:uppercase;letter-spacing:2.5px;font-size:11px;font-weight:700;color:#8fc5ff;margin-bottom:10px;}
.calc-hero h1{font-size:34px;line-height:1.25;letter-spacing:-.5px;}
.calc-hero h1 span{color:#66b5ff;}
.calc-hero p{max-width:760px;margin-top:12px;color:#d4e5f5;font-size:16px;}
.calc-layout{padding:28px 0 56px;display:grid;gap:20px;}
.panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;box-shadow:0 8px 24px rgba(11,37,69,.045);}
.panel h2,.results-section>h2{font-size:19px;color:var(--navy);margin-bottom:5px;}
.panel-sub{color:var(--muted);font-size:13.5px;margin-bottom:16px;}
textarea{width:100%;resize:vertical;min-height:150px;border:1px solid #cddbe8;border-radius:9px;padding:13px 14px;color:var(--text);background:#fbfdff;line-height:1.55;font-family:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;font-size:13px;outline:none;}
textarea:focus,input:focus,select:focus{border-color:var(--blue2);box-shadow:0 0 0 3px rgba(42,139,240,.12);outline:none;}
.paste-options{display:flex;align-items:center;gap:12px;margin:14px 0;}
.paste-options label,.settings-grid label{font-size:13px;font-weight:700;color:var(--navy);}
select,input{height:40px;border:1px solid #cddbe8;border-radius:7px;background:#fff;color:var(--text);padding:0 10px;}
.button-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;}
.button-row.compact{justify-content:flex-end;}
.format-note{font-size:12px;color:var(--muted);margin-top:12px;}
.status{display:block;font-size:13px;margin-top:10px;min-height:20px;color:var(--green);font-weight:600;}
.status.err{color:var(--red);}
.settings-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:16px;}
.settings-grid>div{display:flex;flex-direction:column;gap:7px;}
.settings-grid input,.settings-grid select{width:100%;}
.settings-group-title{grid-column:1/-1;margin:4px 0 -4px;padding:10px 12px;background:#fff7ed;border-left:3px solid var(--orange);border-radius:0 7px 7px 0;font-size:12.5px;line-height:1.6;font-weight:600;color:#8a5a00;}
.settings-grid>div.express-only{background:#fffaf3;border:1px solid #f6e4c8;border-radius:9px;padding:10px 12px;}
.air-unaffected{margin-top:6px !important;color:var(--blue) !important;font-weight:600;}
.panel-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;}
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:9px;}
.calc-table{width:100%;border-collapse:collapse;min-width:980px;font-size:13px;}
.calc-table th{background:#edf4fa;color:var(--navy);font-weight:700;padding:10px 8px;text-align:left;white-space:nowrap;}
.calc-table td{padding:7px 8px;border-top:1px solid var(--line);vertical-align:middle;}
.calc-table tr:hover td{background:#fbfdff;}
.calc-table td:first-child{color:var(--muted);width:34px;}
.calc-table input{width:82px;height:34px;padding:0 7px;font-size:13px;}
.calc-table input.qty-input{width:64px;}
.calc-table td.numeric{white-space:nowrap;font-variant-numeric:tabular-nums;color:var(--navy);}
.delete-row{border:0;background:transparent;color:var(--red);cursor:pointer;font-size:12px;padding:5px;white-space:nowrap;}
.results-section{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;box-shadow:0 8px 24px rgba(11,37,69,.045);}
.totals-strip{display:flex;gap:34px;padding:10px 0 18px;border-bottom:1px solid var(--line);margin-bottom:18px;}
.totals-strip>div{display:flex;flex-direction:column;}
.totals-strip span{font-size:12px;color:var(--muted);}
.totals-strip strong{font-size:22px;color:var(--navy);}
.totals-strip b{font-weight:800;}
.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.result-card{border:1px solid var(--line);border-radius:12px;padding:20px;position:relative;overflow:hidden;}
.result-card:before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--blue);}
.express-card:before{background:var(--orange);}
.result-service{font-size:16px;font-weight:800;color:var(--navy);margin-bottom:14px;}
.result-volume{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:14px;}
.result-volume strong{color:var(--text);}
.result-charge{display:flex;justify-content:space-between;align-items:flex-end;margin-top:9px;}
.result-charge>span{font-weight:700;color:var(--navy);}
.result-charge strong{font-size:36px;line-height:1.1;color:var(--blue);font-variant-numeric:tabular-nums;}
.express-card .result-charge strong{color:#dc6d08;}
.result-charge small{font-size:15px;}
.result-card p{font-size:11.5px;color:var(--muted);margin-top:14px;}
.formula-note{background:#edf5fc;border-radius:8px;padding:11px 14px;color:var(--navy);font-size:13px;margin-top:12px;text-align:left;line-height:1.7;}
.formula-note.express-note{background:#f2f0fb;}
.formula-note b{font-weight:700;}
.surcharge-note{background:#fff4e5;border:1px solid #f0d19a;border-radius:8px;padding:11px 14px;color:#8a5a00;font-size:13px;margin-top:12px;line-height:1.7;}
.surcharge-note[hidden]{display:none;}
.rules-note{margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);font-size:12.5px;color:var(--muted);line-height:1.75;}
.footer-links{margin-top:10px;}
.footer-links a{color:inherit;text-decoration:underline;text-underline-offset:3px;}
.result-actions{display:flex;align-items:center;gap:12px;margin-top:16px;}
.result-actions .status{margin:0;}
.disclaimer{font-size:12px;color:var(--muted);margin-top:14px;}
.site-footer{background:var(--navy);color:#c8d6e5;padding:24px 0;text-align:center;font-size:12px;line-height:1.9;}
[hidden]{display:none!important;}
@media(max-width:760px){
  .header-inner{height:66px;}.logo img{height:34px;}
  .top-nav{gap:9px;font-size:12px;}.top-nav>a:first-child{display:none;}.top-nav .btn{padding:7px 11px;}
  .calc-hero{padding:34px 0 38px;}.calc-hero h1{font-size:27px;}.calc-hero p{font-size:14px;}
  .panel,.results-section{padding:18px;}.settings-grid,.result-grid{grid-template-columns:1fr;}.panel-heading{display:block;}.button-row.compact{justify-content:flex-start;margin-bottom:14px;}
  .totals-strip{gap:24px;}.result-charge strong{font-size:32px;}.paste-options{align-items:flex-start;flex-direction:column;gap:6px;}
}