:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--background:#f5f6f4;--surface:#fff;--foreground:#16181d;--muted:#646b73;--border:#d9ded8;--accent:#0f766e;--accent-strong:#0b5f59;--danger:#b42318}*{box-sizing:border-box}html,body{background:var(--background);min-height:100%;color:var(--foreground);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}a{color:inherit}.page{place-items:center;min-height:100vh;padding:24px;display:grid}.auth-panel,.calculator-panel{border:1px solid var(--border);background:var(--surface);border-radius:8px;width:min(760px,100%);padding:28px}.auth-panel{gap:24px;display:grid}.calculator-panel{gap:28px;display:grid}.top-bar{justify-content:space-between;align-items:flex-start;gap:20px;display:flex}.eyebrow{color:var(--accent);text-transform:uppercase;margin:0 0 12px;font-size:13px;font-weight:700}h1{margin:0;font-size:30px;line-height:1.12}p{color:var(--muted);font-size:16px;line-height:1.5}.user-line{margin:10px 0 0}.form,.calculator-grid{gap:18px;display:grid}label{color:var(--foreground);gap:8px;font-size:14px;font-weight:700;display:grid}input{border:1px solid var(--border);width:100%;min-height:46px;color:var(--foreground);font:inherit;background:#fbfcfb;border-radius:6px;padding:10px 12px;font-size:17px}input:focus,button:focus-visible{outline-offset:2px;outline:3px solid #9dd9cf}button{border:1px solid var(--border);background:var(--surface);min-height:44px;color:var(--foreground);cursor:pointer;font:inherit;border-radius:6px;padding:10px 14px;font-weight:700}button:hover{border-color:var(--accent)}.primary-action{border-color:var(--accent);background:var(--accent);color:#fff}.primary-action:hover{background:var(--accent-strong)}.secondary-action{white-space:nowrap}.mode-switch,.operator-row{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.operator-row{grid-template-columns:repeat(4,minmax(0,1fr))}.mode-switch button.active,.operator-row button.active{border-color:var(--accent);color:var(--accent-strong);background:#e7f4f1}.operator-row button{aspect-ratio:1;font-size:22px}.result{border:1px solid var(--border);min-height:88px;color:var(--foreground);overflow-wrap:anywhere;text-align:center;background:#f6f8f6;border-radius:8px;place-items:center;padding:18px;font-size:34px;font-weight:800;display:grid}.status{color:var(--danger);margin:0;font-size:14px}@media (max-width:560px){.page{padding:14px}.auth-panel,.calculator-panel{padding:20px}.top-bar{display:grid}.secondary-action{width:100%}h1{font-size:25px}.result{font-size:28px}}