/* btc-qrcode.com — honest QR generator styles. Lean, no framework. */
:root{
  --accent:#f7931a; --qr-fg:#0b0f19;
  --bg:#0b0f19; --bg-2:#121826; --card:#161d2e; --card-2:#1c2540;
  --text:#e8ecf5; --muted:#9aa6bd; --line:#26304a;
  --ok:#22c55e; --warn:#f59e0b; --radius:16px; --shadow:0 10px 40px rgba(0,0,0,.35);
  --maxw:1080px; --sans:system-ui,-apple-system,Segoe UI,Roboto,Inter,Helvetica,Arial,sans-serif;
}
@media (prefers-color-scheme: light){
  :root{ --bg:#f4f6fb; --bg-2:#eef1f8; --card:#ffffff; --card-2:#f7f9fe;
    --text:#0b1220; --muted:#5a6782; --line:#e3e8f2; --qr-fg:#0b0f19; --shadow:0 10px 40px rgba(20,30,60,.10); }
}
:root[data-theme="dark"]{ --bg:#0b0f19; --bg-2:#121826; --card:#161d2e; --card-2:#1c2540; --text:#e8ecf5; --muted:#9aa6bd; --line:#26304a; --qr-fg:#0b0f19; --shadow:0 10px 40px rgba(0,0,0,.35); }
:root[data-theme="light"]{ --bg:#f4f6fb; --bg-2:#eef1f8; --card:#fff; --card-2:#f7f9fe; --text:#0b1220; --muted:#5a6782; --line:#e3e8f2; --shadow:0 10px 40px rgba(20,30,60,.10); }

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--sans);background:radial-gradient(1200px 600px at 50% -10%,color-mix(in srgb,var(--accent) 12%,var(--bg)),var(--bg)) fixed;color:var(--text);line-height:1.6;font-size:16px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
img{max-width:100%;height:auto}

/* header */
.site-head{display:flex;align-items:center;justify-content:space-between;padding:18px 0;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--text)}
.brand img{width:30px;height:30px}
.brand span b{color:var(--accent)}
.theme-btn{background:var(--card);border:1px solid var(--line);color:var(--text);border-radius:10px;width:40px;height:40px;cursor:pointer;font-size:18px;display:grid;place-items:center}
.nav{display:flex;gap:6px;flex-wrap:wrap}
.nav a{color:var(--muted);padding:6px 10px;border-radius:8px;font-size:14px}
.nav a:hover{background:var(--card);text-decoration:none;color:var(--text)}

/* hero */
.hero{text-align:center;padding:26px 0 8px}
.hero h1{font-size:clamp(1.7rem,4.5vw,2.6rem);line-height:1.15;margin:.2em 0 .3em;letter-spacing:-.02em}
.hero h1 .accent{color:var(--accent)}
.hero p.lead{color:var(--muted);max-width:620px;margin:0 auto;font-size:1.06rem}
.trust{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin:16px 0 4px;color:var(--muted);font-size:.86rem}
.trust b{color:var(--text)}
.trust span{display:inline-flex;align-items:center;gap:6px}
.trust svg{color:var(--ok)}

/* generator card */
.gen{display:grid;grid-template-columns:1.1fr .9fr;gap:22px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin:22px 0}
@media (max-width:800px){.gen{grid-template-columns:1fr;padding:18px}}
.coins{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.coin-chip{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border:1px solid var(--line);background:var(--card-2);border-radius:999px;cursor:pointer;color:var(--text);font-weight:600;font-size:.92rem}
.coin-chip img{width:20px;height:20px}
.coin-chip.active{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 16%,transparent);box-shadow:0 0 0 1px var(--accent) inset}
.field{margin:0 0 14px}
.field label{display:block;font-size:.82rem;color:var(--muted);margin-bottom:6px;font-weight:600}
.input,.select{width:100%;padding:13px 14px;background:var(--bg-2);border:1px solid var(--line);border-radius:12px;color:var(--text);font-size:1rem;font-family:inherit}
.input:focus,.select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 25%,transparent)}
.input.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92rem}
.hint{min-height:20px;font-size:.82rem;margin-top:6px}
.hint.ok{color:var(--ok)} .hint.warn{color:var(--warn)}
.amount-row{display:flex;gap:0}
.amount-row .input{border-radius:12px 0 0 12px}
.amount-row .unit{display:flex;align-items:center;padding:0 14px;background:var(--card-2);border:1px solid var(--line);border-left:0;border-radius:0 12px 12px 0;color:var(--muted);font-weight:700;font-size:.9rem}
.opts-toggle{background:none;border:0;color:var(--accent);cursor:pointer;font-size:.9rem;font-weight:600;padding:4px 0;display:inline-flex;align-items:center;gap:6px}
.opts{display:none;margin-top:12px;padding-top:14px;border-top:1px dashed var(--line)}
.opts.open{display:block}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:520px){.grid2{grid-template-columns:1fr}}

/* qr side */
.qr-side{display:flex;flex-direction:column;align-items:center;gap:14px}
.qr-card{background:#fff;border-radius:18px;padding:16px;width:min(320px,86vw);aspect-ratio:1;display:grid;place-items:center;box-shadow:inset 0 0 0 1px rgba(0,0,0,.06);position:relative}
.qr-card svg{width:100%;height:100%;display:block;border-radius:8px}
.qr-badge{position:absolute;width:44px;height:44px;border-radius:10px;background:#fff;padding:5px;box-shadow:0 4px 14px rgba(0,0,0,.18)}
.qr-placeholder{color:#8a93a8;text-align:center;display:flex;flex-direction:column;gap:10px;align-items:center;padding:24px;font-size:.9rem}
.qr-card:not(.has-qr) .qr-badge{display:none}
.uri-out{width:min(320px,86vw);font-size:.78rem;color:var(--muted);background:var(--bg-2);border:1px solid var(--line);border-radius:10px;padding:8px 10px;resize:none;font-family:ui-monospace,Menlo,monospace;text-align:center}
.actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;width:min(320px,86vw)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:var(--card-2);color:var(--text);font-weight:600;font-size:.92rem;cursor:pointer;font-family:inherit;transition:transform .05s}
.btn:hover{border-color:var(--accent)}
.btn:active{transform:translateY(1px)}
.btn svg{width:17px;height:17px}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#0b0f19;grid-column:1/-1}
.btn.primary:hover{filter:brightness(1.05)}
.btn.share{grid-column:1/-1;background:color-mix(in srgb,var(--accent) 14%,transparent)}
.btn.is-disabled,.btn:disabled{opacity:.45;cursor:not-allowed}
.btn.copied{border-color:var(--ok);color:var(--ok)}

/* content */
.content{padding:20px 0 40px}
.content h2{font-size:1.5rem;margin:1.6em 0 .5em;letter-spacing:-.01em}
.content h3{font-size:1.12rem;margin:1.3em 0 .3em}
.content p,.content li{color:var(--text)}
.steps{list-style:none;counter-reset:s;padding:0;display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.steps li{counter-increment:s;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 18px 18px 56px;position:relative}
.steps li::before{content:counter(s);position:absolute;left:16px;top:16px;width:28px;height:28px;border-radius:8px;background:var(--accent);color:#0b0f19;font-weight:800;display:grid;place-items:center}
.faq{display:grid;gap:10px;margin-top:10px}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:2px 16px}
.faq summary{cursor:pointer;padding:14px 0;font-weight:600;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--accent);font-weight:800}
.faq details[open] summary::after{content:"–"}
.faq details p{margin:0 0 14px;color:var(--muted)}
.langbar{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0;padding-top:18px;border-top:1px solid var(--line)}
.langbar a{font-size:.85rem;color:var(--muted);padding:4px 10px;border:1px solid var(--line);border-radius:8px}
.langbar a:hover{color:var(--text);text-decoration:none;border-color:var(--accent)}

/* footer */
.site-foot{border-top:1px solid var(--line);padding:24px 0;color:var(--muted);font-size:.86rem;text-align:center}
.site-foot a{color:var(--muted)}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}