:root{--bg:#f4f6f6;--paper:#fff;--ink:#24332f;--muted:#82908b;--line:#e7ece9;--green:#265e49;--dark:#142c29;--mint:#d7edc5;--red:#b3423d;font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink);font-size:14px;font-synthesis:none}
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@media(max-width:390px){.page{padding:23px 12px 0}.input-card{padding:20px 16px}.two-cols{gap:10px}.segmented span{font-size:9px}.hero-metrics strong{font-size:19px}h1{font-size:22px}.intro .button{font-size:9px;padding:8px}.history{padding:20px 16px}.hero-metrics{gap:10px}.result-card{padding:24px 20px}.pair-row>select{font-size:12px}.source-line{font-size:8px}.history-heading p{line-height:1.7}}
.combined input{width:0;flex:1 1 0}.combined select{flex:0 0 68px;min-width:68px}
.top-actions{display:flex;align-items:center;gap:18px}.top-actions .text-button{margin-left:0}
.login-page{min-height:100vh;background:#142c29;background-image:radial-gradient(ellipse at 70% 10%,#335745,transparent 65%);display:grid;place-items:center;padding:32px 20px}.login-shell{margin:0;width:100%;max-width:430px}.login-shell>.brand{justify-content:center;margin-bottom:32px}.login-card{padding:36px 32px}.login-card h1{font-size:29px}.login-card>p{color:#85928b;font-size:12px;line-height:1.8;margin:14px 0 29px}.login-card label{display:block;font-size:12px;margin-bottom:10px}.login-card .input-wrap{margin-bottom:22px}.login-card .input-wrap input{font-size:16px}.login-card>small{display:block;text-align:center;color:#93a18e;font-size:10px;margin-top:20px}.login-footer{text-align:center;color:#91aa96;margin-top:30px;font-size:11px;letter-spacing:2px}
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