:root{--bg:#fff;--fg:#1f2328;--mut:#5d6470;--line:#e2e4e8;--accent:#0b6e4f;--soft:#eef6f2;--warn:#8a3b12}
@media (prefers-color-scheme:dark){:root{--bg:#16181c;--fg:#e8eaed;--mut:#a1a7b0;--line:#2f333a;--accent:#4cc39a;--soft:#1d2a25;--warn:#f0a070}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.7 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--accent)}main{max-width:760px;margin:0 auto;padding:16px}
.site-header{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid var(--line)}
.logo{font-weight:700;text-decoration:none;color:var(--fg)}.site-header nav a{margin-left:14px;font-size:14px}
.pr{max-width:760px;margin:8px auto 0;padding:0 16px;font-size:12px;color:var(--mut)}
h1{font-size:28px;line-height:1.3}h2{font-size:20px;margin-top:28px}.lead{color:var(--mut)}
.tool{border:1px solid var(--line);border-radius:12px;padding:16px;margin:16px 0}
.row{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:8px}.row label{display:flex;flex-direction:column;font-size:14px}
input[type=number],select{font:inherit;padding:6px 8px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--fg);max-width:160px}
button{font:inherit;padding:6px 12px;border-radius:8px;border:1px solid var(--accent);background:var(--accent);color:#fff;cursor:pointer}
#rides button{background:none;color:var(--mut);border-color:var(--line);font-size:12px;padding:2px 8px}
.seg{display:flex;gap:8px;align-items:center;padding:6px 0;border-bottom:1px dashed var(--line)}.yen{margin-left:auto;color:var(--mut)}
.result{background:var(--soft);border-radius:10px;padding:12px 14px;margin-top:12px}.win{color:var(--accent);font-weight:600}.lose{color:var(--warn);font-weight:600}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}.card{display:block;border:1px solid var(--line);border-radius:12px;padding:14px;text-decoration:none;color:var(--fg)}.card h2{margin:0 0 6px;font-size:18px;color:var(--accent)}
.src{font-size:13px;word-break:break-all}.meta{color:var(--mut);font-size:13px}
.site-footer{border-top:1px solid var(--line);margin-top:40px;padding:16px;font-size:13px;color:var(--mut);text-align:center}.site-footer nav a{margin:0 8px}
table{border-collapse:collapse;width:100%;font-size:14px}th,td{border:1px solid var(--line);padding:6px 8px;text-align:left}
.fig{margin:16px 0}.fig img,.card img{width:100%;height:auto;border-radius:12px;display:block}.fig figcaption{font-size:13px;color:var(--mut);margin-top:6px}
.card img{margin-bottom:8px;background:#f7faf8}
/* guides: keep tables and long URLs inside the phone screen */
article table{display:block;overflow-x:auto;max-width:100%;border-collapse:collapse;font-size:.92em}
article th,article td{border:1px solid var(--line);padding:.35em .5em;text-align:left;vertical-align:top}
article a{overflow-wrap:anywhere}
.book{border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:10px;padding:10px 14px;margin:20px 0}.book h2{margin-top:4px}.book li{margin:6px 0}
.prtag{font-size:11px;border:1px solid var(--mut);color:var(--mut);border-radius:4px;padding:0 4px;vertical-align:middle}.mut{font-size:12px;color:var(--mut)}
/* tax-free calculator lines */
.tline{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:flex-end;padding:10px 0;border-bottom:1px dashed var(--line)}.tline label{display:flex;flex-direction:column;font-size:13px}
input[type=text],input[type=date]{font:inherit;padding:6px 8px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--fg);max-width:170px}
.tline .rm{background:none;color:var(--mut);border-color:var(--line);font-size:12px;padding:2px 8px}
.result table{display:block;overflow-x:auto;margin-bottom:8px}
main li,main p{overflow-wrap:anywhere}
/* header nav wraps on phones instead of pushing the page sideways */
.site-header nav{display:flex;flex-wrap:wrap;gap:4px 14px}.site-header nav a{margin-left:0}
main table{display:block;overflow-x:auto;max-width:100%}
#calc select#from{max-width:100%}