:root{--bg:#f2f2f7;--card:#fff;--card-soft:#f9f9fb;--text:#111;--muted:#6e6e73;--line:#3c3c432e;--blue:#007aff;--blue-pressed:#0068d9;--green:#34c759;--shadow:0 10px 26px #00000014}*{box-sizing:border-box}html{background:var(--bg);min-height:100%;color:var(--text);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,PingFang SC,Hiragino Sans GB,sans-serif}body{background:var(--bg);min-height:100vh;margin:0}button,input,select{font:inherit}button,select,input{-webkit-tap-highlight-color:transparent}.app-shell{width:min(100%,520px);padding:calc(6px + env(safe-area-inset-top)) 10px 74px;margin:0 auto}.hero{padding:0 0 8px}.hero h1{letter-spacing:-.03em;margin:0 2px 8px;font-size:24px;font-weight:800;line-height:1.15}.tool-tabs{background:#76768029;border-radius:10px;grid-template-columns:repeat(3,minmax(0,1fr));gap:2px;padding:2px;display:grid}.tool-tabs button{min-height:30px;color:var(--text);background:0 0;border:0;border-radius:8px;font-size:14px;font-weight:600}.tool-tabs .active{background:var(--card);box-shadow:0 1px 4px #00000029}.panel{margin-top:4px}.form-grid{background:var(--card);border-radius:14px;overflow:hidden;box-shadow:0 0 0 .5px #0000000a}.field{border-bottom:.5px solid var(--line);grid-template-columns:minmax(112px,42%) 1fr;align-items:center;min-height:42px;padding:0 11px;display:grid}.field:last-child{border-bottom:0}.field span{color:var(--text);font-size:16px;font-weight:500}.field select,.field input{width:100%;min-height:40px;color:var(--blue);text-align:right;background:0 0;border:0;outline:none;font-size:16px;font-weight:600}.field input[readonly]{color:var(--muted)}.field select{appearance:none;direction:rtl;padding-right:0}.field select option{direction:ltr}.input-row{grid-template-columns:1fr auto;align-items:center;gap:6px;display:grid}.input-row b{color:var(--muted);font-size:15px;font-weight:500}.solve-button{background:var(--blue);color:#fff;border:0;border-radius:14px;width:100%;min-height:44px;margin-top:9px;font-size:17px;font-weight:700;transition:transform .16s,background .16s,box-shadow .16s;box-shadow:0 8px 18px #007aff38}.solve-button:active{background:var(--blue-pressed);transform:translateY(1px)}.solve-button.confirmed{background:var(--green);box-shadow:0 8px 18px #34c7593d}.result-card{background:var(--card);box-shadow:var(--shadow);border-radius:18px;margin-top:9px;padding:12px;transition:box-shadow .18s,transform .18s}.result-card.pulse{box-shadow:0 0 0 2px #34c75938, var(--shadow);transform:translateY(-1px)}.result-card>span{color:var(--muted);font-size:13px;font-weight:600;display:block}.result-card>strong{color:var(--text);letter-spacing:-.05em;margin:3px 0 4px;font-size:26px;font-weight:800;line-height:1.1;display:block}.result-card>p{color:var(--muted);margin:0;font-size:14px;line-height:1.55}.placeholder{box-shadow:0 0 0 .5px #0000000a}.plan-metrics{grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;margin-top:9px;display:grid}.plan-metrics div{background:var(--card-soft);border-radius:13px;min-height:58px;padding:8px 9px}.plan-metrics span{color:var(--muted);font-size:12px;font-weight:600;display:block}.plan-metrics b{color:var(--text);margin-top:5px;font-size:16px;font-weight:750;line-height:1.25;display:block}.plan-list{background:var(--card-soft);border-radius:14px;margin-top:9px;overflow:hidden}.plan-list p{border-bottom:.5px solid var(--line);color:#2c2c2e;gap:4px;margin:0;padding:8px 10px;font-size:14px;line-height:1.55;display:grid}.plan-list p:last-child{border-bottom:0}.plan-list b{color:var(--blue);font-size:13px;font-weight:700}.color-card .plan-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.sample-link{color:var(--blue);margin-right:8px;text-decoration:none;display:inline-block}.bottom-nav{z-index:30;width:min(100%,520px);padding:6px 10px calc(6px + env(safe-area-inset-bottom));border-top:.5px solid var(--line);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#f8f8f8db;grid-template-columns:repeat(2,1fr);gap:8px;margin:0 auto;display:grid;position:fixed;bottom:0;left:0;right:0}.bottom-nav button{min-height:36px;color:var(--muted);background:0 0;border:0;border-radius:12px;font-size:13px;font-weight:700}.bottom-nav .active{color:var(--blue);background:#007aff1a}@media (width>=720px){.app-shell{padding-top:24px}}