*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Segoe UI',Arial,sans-serif;background:#f0f2f5;color:#333}
.header{background:linear-gradient(90deg,#8a3a1a,#5a2410);color:#fff;padding:0;box-shadow:0 2px 8px rgba(0,0,0,.2);position:sticky;top:0;z-index:100}
.header-inner{max-width:1400px;margin:0 auto;padding:12px 24px;display:flex;justify-content:space-between;align-items:center}
.logo{font-size:20px;font-weight:bold}
.header-right{display:flex;align-items:center;gap:12px}
.lang-select{padding:6px 12px;border-radius:4px;border:1px solid #fff;background:rgba(255,255,255,.15);color:#fff;font-size:14px;cursor:pointer}
.lang-select option{color:#333;background:#fff}
.nav-btn{padding:6px 16px;border:1px solid #fff;border-radius:4px;color:#fff;text-decoration:none;font-size:14px;transition:all .2s}
.nav-btn:hover{background:#fff;color:#5a2410}
.email-btn{background:rgba(255,255,255,.15)}
.tab-bar{background:#fff;border-bottom:2px solid #e0e0e0;display:flex;flex-wrap:wrap;justify-content:center;padding:0 16px}
.tab-btn{padding:12px 20px;border:none;background:transparent;font-size:15px;cursor:pointer;color:#666;font-weight:500;border-bottom:3px solid transparent;transition:all .2s;white-space:nowrap}
.tab-btn:hover{color:#8a3a1a;background:#fdf5f2}
.tab-btn.active{color:#8a3a1a;border-bottom-color:#8a3a1a;font-weight:bold}
.container{max-width:1400px;margin:0 auto;padding:24px}
.tab-content{display:none}
.tab-content.active{display:block}
h2{font-size:22px;color:#5a2410;margin-bottom:8px;padding-bottom:8px;border-bottom:2px solid #e0d5cf}
.note{background:#fff8e7;border-left:4px solid #c0623a;padding:10px 16px;margin-bottom:16px;border-radius:4px;font-size:14px;color:#6b3a1f}
.calc-row{display:flex;gap:24px;flex-wrap:wrap}
.calc-col{flex:1;min-width:320px;background:#fff;border-radius:8px;padding:20px;box-shadow:0 2px 6px rgba(0,0,0,.06)}
.section-title{font-size:16px;font-weight:bold;color:#5a2410;margin:16px 0 10px;padding-bottom:6px;border-bottom:1px solid #e0d5cf}
.section-title:first-child{margin-top:0}
.input-grid{display:flex;flex-wrap:wrap;gap:10px}
.input-item{display:flex;flex-direction:column;flex:1;min-width:140px}
.input-item.full{flex:100%}
.input-item label{font-size:13px;color:#555;margin-bottom:4px;font-weight:500}
.input-item input,.input-item select{padding:8px 10px;border:1px solid #ccc;border-radius:4px;font-size:14px;width:100%;transition:border-color .2s}
.input-item input:focus,.input-item select:focus{border-color:#8a3a1a;outline:none;box-shadow:0 0 0 2px rgba(138,58,26,.15)}
.input-item .unit{font-size:12px;color:#999;margin-top:2px}
.input-item .hint{font-size:11px;color:#c0623a;margin-top:2px}
.btn-row{margin-top:16px;display:flex;gap:10px}
.btn-calc{background:#8a3a1a;color:#fff;padding:10px 32px;border:none;border-radius:4px;font-size:15px;cursor:pointer;font-weight:bold;transition:background .2s}
.btn-calc:hover{background:#6b2a10}
.btn-reset{background:#e0e0e0;color:#555;padding:10px 24px;border:none;border-radius:4px;font-size:15px;cursor:pointer}
.btn-reset:hover{background:#ccc}
.result-table{font-size:14px}
.result-table table{width:100%;border-collapse:collapse;margin-top:8px}
.result-table th{background:#f5ede8;color:#5a2410;padding:8px 12px;text-align:left;border:1px solid #e0d5cf;font-weight:600}
.result-table td{padding:8px 12px;border:1px solid #e0d5cf}
.result-table tr:nth-child(even) td{background:#fdf9f7}
.result-table .lbl{font-weight:500;color:#555}
.result-table .val{color:#1a1a1a}
.result-table .unt{color:#888}
.result-table .ok{color:#2d8a2d;font-weight:bold}
.result-table .warn{color:#c0623a;font-weight:bold}
.result-table .err{color:#c03a1a;font-weight:bold}
.sub-title{font-size:16px;font-weight:bold;color:#5a2410;margin:20px 0 10px;padding-bottom:6px;border-bottom:1px solid #e0d5cf}
@media(max-width:600px){.header-inner{flex-direction:column;gap:8px}.calc-row{flex-direction:column}.tab-btn{padding:10px 12px;font-size:13px}}