:root{color-scheme:dark;--bg:#171b1b;--text:#edf2ee;--muted:#acb9b2;--line:#35413c;--accent:#b6d8bf;--hover:#222b26}*{box-sizing:border-box}body{margin:0;min-height:100svh;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;display:flex;flex-direction:column;padding:clamp(24px,6vw,80px)}main{width:min(100%,620px);margin:auto}a{color:inherit;text-decoration:none;text-underline-offset:4px}a:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:5px}.brand{display:inline-block;color:var(--accent);font-size:22px;font-weight:650;margin-bottom:48px}h1{font-size:clamp(28px,5vw,42px);line-height:1.35;font-weight:600;letter-spacing:-.025em;margin:0 0 16px;text-wrap:balance}p{font-size:16px;line-height:1.8;color:var(--muted);margin:0}.lines{margin-top:36px;border-top:1px solid var(--line)}.lines a{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding:16px 8px;font-size:17px;transition:background-color .16s ease-out}.lines a:hover{background:var(--hover)}.result{font-size:14px;color:var(--accent);font-variant-numeric:tabular-nums}.hint{font-size:14px;margin-top:20px;max-width:48ch}button{background:transparent;color:var(--text);border:1px solid var(--line);border-radius:8px;min-height:44px;padding:10px 18px;margin-top:24px;font:inherit;font-size:14px;cursor:pointer}button:hover{background:var(--hover)}button:disabled{color:var(--muted);cursor:wait}footer{color:var(--muted);font-size:12px;text-align:center;padding-top:56px}::selection{background:var(--accent);color:var(--bg)}@media(prefers-reduced-motion:reduce){*{transition:none!important}}