:root{
  --bg:#3aa8a0; --card:#f4f1e8; --ink:#0e2b28; --accent:#c25a3f;
  --good:#2f7d4f; --hook:#6b4a8a; --mut:#5a6a66;
}
*{box-sizing:border-box}
body{margin:0;font-family:Tahoma,Helvetica,Arial,sans-serif;color:var(--ink);
  background:var(--bg);background-image:radial-gradient(#ffffff22 1px,transparent 1px);
  background-size:18px 18px;min-height:100vh;padding:14px}
.wrap{max-width:640px;margin:0 auto}
.win{background:var(--card);border:2px solid var(--ink);box-shadow:7px 7px 0 #0e2b2855;
  border-radius:4px;margin:14px 0;overflow:hidden}
.bar{background:var(--ink);color:#eafaf6;padding:9px 12px;font-weight:bold;
  display:flex;justify-content:space-between;align-items:center;font-size:14px}
.body{padding:16px}
h1{font-size:20px;margin:.2em 0}
h2{font-size:16px;margin:.1em 0}
p{line-height:1.5;margin:.5em 0}
.q{font-size:22px;font-weight:bold;margin:12px 0;text-align:center;white-space:pre-line}
.sub{font-size:12px;color:var(--mut);text-transform:uppercase;letter-spacing:.05em}
input[type=text]{font-size:20px;padding:12px;width:100%;border:2px solid var(--ink);
  border-radius:4px;font-family:inherit;text-align:center}
button{font-family:inherit;font-size:16px;padding:12px 18px;border:2px solid var(--ink);
  background:var(--accent);color:#fff;border-radius:4px;cursor:pointer;font-weight:bold;
  box-shadow:3px 3px 0 #0e2b2855}
button:disabled{background:#c9c2b3;color:#7a7364;cursor:not-allowed;box-shadow:none}
button.ghost{background:var(--card);color:var(--ink)}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:12px;justify-content:center}
.fb{margin-top:14px;border-radius:4px;overflow:hidden;display:none}
.fb.show{display:block}
.fb .beat{padding:10px 13px;font-size:15px;line-height:1.5}
.fb .b1{background:#2f7d4f18;font-weight:bold}
.fb .b2{background:#c25a3f14}
.fb .b3{background:#6b4a8a14}
.fb.ok .b1{background:#2f7d4f26}
.link{color:var(--accent);cursor:pointer;text-decoration:underline;font-size:13px;background:none;border:none;box-shadow:none}
svg{max-width:100%;height:auto;background:#fff;border:2px solid var(--ink);border-radius:4px;margin:6px 0}
.break{background:#f4c04e22;border:2px dashed var(--accent);padding:14px;border-radius:4px}
.hidden{display:none}
.demo{background:#f4c04e33;border:1px solid #c25a3f;color:#0e2b28;border-radius:4px;padding:6px 10px;font-size:12px;margin-bottom:10px;text-align:center}
.explain-box{width:100%;max-width:440px;margin:10px auto 0;border:2px solid var(--ink);border-radius:6px;background:#F6F8F4;padding:6px;box-shadow:4px 4px 0 #0e2b2833}
.explain-box svg{display:block;width:100%;height:auto}
.prog2{font-size:12px;color:var(--mut);margin-bottom:10px}
.pbar{height:8px;background:#0e2b2815;border-radius:6px;overflow:hidden;margin-top:4px}
.pbar>i{display:block;height:100%;background:var(--good);transition:width .3s}
.help{margin:10px 0;font-size:14px;background:#6b4a8a10;border:1px solid #6b4a8a44;border-radius:4px;padding:6px 12px}
.help summary{cursor:pointer;color:var(--hook);font-weight:bold}
.help ol{margin:8px 0 4px 18px;padding:0}
.help li{margin:4px 0;line-height:1.4}
.center{text-align:center}
.err{color:var(--accent);font-size:13px;min-height:18px}
.pill{display:inline-block;background:#0e2b2810;border:1px solid var(--ink);border-radius:20px;
  padding:2px 10px;font-size:12px;margin:2px}
table{width:100%;border-collapse:collapse;font-size:14px}
td,th{padding:6px 8px;border-bottom:1px solid #0e2b2822;text-align:left}
.good{color:var(--good);font-weight:bold}
.bad{color:var(--accent);font-weight:bold}