:root{
  --bg:#f6f7fb; --surface:#fff; --surface-2:#f1f3f9; --ink:#1a1c25; --muted:#606a7b;
  --line:#e5e8f0; --accent:#4f46e5; --accent-ink:#4338ca; --ok:#0f9d58; --warn:#c2410c;
  --radius:16px; --shadow:0 1px 2px rgba(20,22,40,.05),0 8px 24px rgba(20,22,40,.06);
  --wrap:960px; --font:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0e1016; --surface:#171a22; --surface-2:#1e222c; --ink:#eef1f7; --muted:#9aa4b6;
  --line:#272c38; --accent:#8b85ff; --accent-ink:#a7a2ff; --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px rgba(0,0,0,.35);
}}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);line-height:1.55;
  -webkit-font-smoothing:antialiased;font-size:16px}
.hidden{display:none!important}
a{color:var(--accent-ink);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.2;margin:0 0 .4em}
main{max-width:var(--wrap);margin:0 auto;padding:0 20px}

/* header */
.site-header{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:14px 20px;background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:1.15rem;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-mark{color:var(--accent)}
.site-nav{display:flex;gap:20px;font-size:.94rem;font-weight:500}
.site-nav a{color:var(--muted)}
.site-nav a:hover{color:var(--ink)}
.lang{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.lang button{font:inherit;font-weight:600;font-size:.8rem;padding:5px 10px;border:0;background:transparent;color:var(--muted);cursor:pointer}
.lang button[aria-pressed="true"]{background:var(--accent);color:#fff}
.lang button:hover{color:var(--ink)}
.lang button[aria-pressed="true"]:hover{color:#fff}

/* hero */
.hero{text-align:center;padding:56px 0 28px}
.pill{display:inline-flex;align-items:center;gap:8px;font-size:.82rem;font-weight:600;color:var(--ok);
  background:color-mix(in srgb,var(--ok) 12%,transparent);padding:6px 13px;border-radius:999px}
.pill .dot{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 3px color-mix(in srgb,var(--ok) 22%,transparent)}
.hero h1{font-size:clamp(1.9rem,5vw,3rem);letter-spacing:-.02em;margin-top:18px}
.lede{max-width:640px;margin:0 auto 26px;color:var(--muted);font-size:1.08rem}

/* dropzone */
.dropzone{max-width:560px;margin:0 auto;background:var(--surface);border:2px dashed var(--line);
  border-radius:var(--radius);padding:38px 24px;cursor:pointer;transition:.15s;box-shadow:var(--shadow)}
.dropzone:hover,.dropzone:focus-visible,.dropzone.drag{border-color:var(--accent);
  background:color-mix(in srgb,var(--accent) 6%,var(--surface));outline:none}
.drop-ic{color:var(--accent);margin-bottom:6px}
.drop-main{font-weight:600;margin:.2em 0}
.drop-main .link{color:var(--accent-ink);text-decoration:underline}
.drop-sub{color:var(--muted);font-size:.88rem;margin:.1em 0 0}
.parse-note{margin-top:16px;font-weight:500}
.parse-note.err{color:var(--warn)}

/* results */
.results{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:26px;margin:8px 0 40px}
.result-head{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.result-head h2{margin:0}
.muted{color:var(--muted)}
.tax-badge{font-size:1.6rem;font-weight:800;letter-spacing:-.02em;padding:8px 18px;border-radius:12px;
  background:color-mix(in srgb,var(--ok) 14%,transparent);color:var(--ok);white-space:nowrap}
.tax-badge.owe{background:color-mix(in srgb,var(--warn) 14%,transparent);color:var(--warn)}

.advanced{margin:20px 0;border:1px solid var(--line);border-radius:12px;background:var(--surface-2)}
.advanced summary{cursor:pointer;padding:12px 16px;font-weight:600}
.advanced .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;padding:0 16px 12px}
.advanced label{display:flex;flex-direction:column;gap:5px;font-size:.85rem;font-weight:600;color:var(--muted)}
.advanced input{font:inherit;padding:9px 11px;border:1px solid var(--line);border-radius:9px;
  background:var(--surface);color:var(--ink)}
.advanced input:focus{outline:2px solid var(--accent);border-color:var(--accent)}
#recalc{margin:0 16px 16px}

/* sheet */
.sheet{margin:6px 0 20px}
.sec{border-top:1px solid var(--line);padding:16px 0}
.sec:first-child{border-top:0}
.sec h3{font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:10px}
.row{display:flex;justify-content:space-between;gap:14px;padding:5px 0}
.row .k{color:var(--muted)}
.row .v{font-weight:600;font-variant-numeric:tabular-nums;text-align:right}
.row.hi{background:color-mix(in srgb,var(--accent) 8%,transparent);margin:6px -12px;padding:10px 12px;border-radius:10px}
.row.hi .v{color:var(--accent-ink);font-size:1.05rem}
.note{color:var(--muted);font-size:.88rem;margin:6px 0 0}
.tag{display:inline-block;font-size:.72rem;font-weight:700;padding:2px 8px;border-radius:6px;
  background:var(--surface-2);color:var(--muted);margin-left:6px}
.tag.ok{background:color-mix(in srgb,var(--ok) 15%,transparent);color:var(--ok)}

.result-actions{display:flex;gap:10px;flex-wrap:wrap}
.btn{font:inherit;font-weight:600;cursor:pointer;border:1px solid var(--accent);background:var(--accent);
  color:#fff;padding:10px 18px;border-radius:10px;transition:.12s}
.btn:hover{filter:brightness(1.06)}
.btn.ghost{background:transparent;color:var(--accent-ink);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--accent)}
.disclaimer{margin-top:16px;font-size:.85rem;color:var(--muted);border-top:1px dashed var(--line);padding-top:14px}

/* how / trust */
.how{padding:26px 0}
.steps{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.steps li{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.steps .num{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;
  background:var(--accent);color:#fff;font-weight:700;margin-bottom:10px}
.steps h3{font-size:1.05rem}
.steps p{margin:0;color:var(--muted);font-size:.95rem}
.trust{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;padding:10px 0 50px}
.trust-card{display:flex;gap:14px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.trust-card svg{color:var(--accent);flex:none}
.trust-card h3{font-size:1rem;margin-bottom:.2em}
.trust-card p{margin:0;color:var(--muted);font-size:.92rem}

/* footer */
.site-footer{border-top:1px solid var(--line);text-align:center;padding:28px 20px;color:var(--muted);font-size:.9rem}
.site-footer nav{margin:6px 0}
.site-footer .fine{font-size:.8rem;opacity:.8;max-width:520px;margin:8px auto 0}

/* legal pages */
.doc{max-width:760px;margin:0 auto;padding:30px 20px 60px}
.doc h1{font-size:1.8rem}
.doc h2{font-size:1.15rem;margin-top:1.6em}
.doc p,.doc li{color:var(--ink)}
.doc .muted{color:var(--muted)}
.back{display:inline-block;font-weight:600}
.doc-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;gap:12px}

@media print{.site-header,.site-nav,.hero,.how,.trust,.site-footer,.result-actions,.advanced{display:none!important}
  body{background:#fff}.results{box-shadow:none;border:0;margin:0}}