:root {
  --bg: #f5f3ee;
  --bg-card: #ffffff;
  --bg-inset: #f0eee8;
  --fg: #232019;
  --fg-soft: #5f584c;
  --fg-faint: #8a8172;
  --border: #e2ddd2;
  --accent: #b4622a;
  --accent-fg: #ffffff;
  --accent-soft: #f6e7dc;
  --ok: #3f7d43;
  --ok-soft: #e4f0e2;
  --err: #b33a2f;
  --err-soft: #f7e2df;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(35, 32, 25, .05), 0 8px 24px rgba(35, 32, 25, .06);
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1814;
    --bg-card: #232019;
    --bg-inset: #2b271f;
    --fg: #ece7dc;
    --fg-soft: #b3ab9b;
    --fg-faint: #837b6c;
    --border: #38332a;
    --accent: #dd8b4e;
    --accent-fg: #201a12;
    --accent-soft: #38271a;
    --ok: #8bc98d;
    --ok-soft: #26301f;
    --err: #e88a7e;
    --err-soft: #331e1a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px 96px; }

.topbar { display: flex; justify-content: flex-end; padding-top: 18px; }
.lang-switch {
  font-size: 13px; font-weight: 600; color: var(--fg-soft);
  text-decoration: none; padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--bg-card);
  transition: border-color .15s, color .15s;
}
.lang-switch:hover { border-color: var(--accent); color: var(--accent); }

header.hero { text-align: center; padding: 40px 0; }
.hero .badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent-soft); color: var(--accent);
  font-size: 13px; font-weight: 600; letter-spacing: .02em;
  padding: 6px 14px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(28px, 6vw, 40px);
  line-height: 1.15; margin: 0 0 14px; letter-spacing: -.02em;
}
.hero p { color: var(--fg-soft); margin: 0 auto; max-width: 30em; font-size: 18px; }

.step { margin-top: 34px; }
.step-head { display: flex; align-items: center; gap: 14px; margin-bottom: 16px; }
.step-num {
  flex: 0 0 auto;
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--accent); color: var(--accent-fg);
  display: grid; place-items: center; font-weight: 700; font-size: 18px;
}
.step-head h2 { font-size: 21px; margin: 0; letter-spacing: -.01em; }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}

.os-links { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 460px) { .os-links { grid-template-columns: 1fr; } }
.os-link {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px; border-radius: 12px;
  border: 1px solid var(--border); background: var(--bg-inset);
  text-decoration: none; color: var(--fg);
  transition: border-color .15s, transform .08s;
}
.os-link:hover { border-color: var(--accent); }
.os-link:active { transform: translateY(1px); }
.os-link.wide { grid-column: 1 / -1; }
@media (max-width: 460px) { .os-link.wide { grid-column: auto; } }
.os-link .os-ico { flex: 0 0 auto; }
.os-link b { display: block; font-size: 15px; }
.os-link span { display: block; font-size: 13px; color: var(--fg-faint); }

.field { margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }
.field label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 6px; }
.field .hint { font-weight: 400; color: var(--fg-faint); font-size: 13px; }
.field input {
  width: 100%; font-family: var(--mono); font-size: 14.5px;
  padding: 11px 13px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--bg-inset); color: var(--fg);
  transition: border-color .15s, box-shadow .15s;
}
.field input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.field input.bad { border-color: var(--err); }
.field .msg { font-size: 12.5px; color: var(--err); margin-top: 5px; min-height: 0; display: none; }
.field .msg.show { display: block; }

.adv { margin-top: 4px; }
.adv summary {
  cursor: pointer; color: var(--fg-soft); font-size: 14px; font-weight: 600;
  padding: 6px 0; user-select: none; list-style: none;
}
.adv summary::-webkit-details-marker { display: none; }
.adv summary::before { content: "▸ "; color: var(--fg-faint); }
.adv[open] summary::before { content: "▾ "; }
.adv .adv-body { padding-top: 12px; }

.btn {
  appearance: none; border: none; cursor: pointer;
  font-family: var(--sans); font-weight: 600; font-size: 16px;
  padding: 13px 20px; border-radius: 11px;
  background: var(--accent); color: var(--accent-fg);
  transition: filter .15s, transform .08s; width: 100%;
}
.btn:hover { filter: brightness(1.05); }
.btn:active { transform: translateY(1px); }
.btn.secondary {
  background: var(--bg-inset); color: var(--fg);
  border: 1px solid var(--border);
}

.note {
  display: flex; gap: 10px; align-items: flex-start;
  font-size: 13.5px; color: var(--fg-soft);
  background: var(--bg-inset); border-radius: 10px;
  padding: 12px 14px; margin-top: 16px;
}
.note svg { flex: 0 0 auto; margin-top: 2px; color: var(--fg-faint); }

#result { display: none; margin-top: 22px; }
#result.show { display: block; }
.result-grid { display: grid; grid-template-columns: auto 1fr; gap: 22px; align-items: start; }
@media (max-width: 560px) { .result-grid { grid-template-columns: 1fr; } }
.qr-box { text-align: center; }
.qr-box canvas {
  background: #fff; border-radius: 12px; padding: 12px;
  width: 220px; height: 220px; box-shadow: var(--shadow);
  image-rendering: pixelated;
}
.qr-cap { font-size: 12.5px; color: var(--fg-faint); margin-top: 8px; max-width: 220px; }
.result-actions { display: flex; flex-direction: column; gap: 10px; }
.conf-pre {
  font-family: var(--mono); font-size: 12.5px; line-height: 1.5;
  background: var(--bg-inset); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px; overflow-x: auto;
  white-space: pre; margin: 0 0 4px; color: var(--fg-soft);
}
.toast {
  position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%) translateY(20px);
  background: var(--fg); color: var(--bg);
  padding: 10px 20px; border-radius: 999px; font-size: 14px; font-weight: 600;
  opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 50;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

ul.plain { padding-left: 20px; margin: 8px 0; }
ul.plain li { margin: 4px 0; }
code.inline {
  font-family: var(--mono); font-size: .9em;
  background: var(--bg-inset); padding: 1px 6px; border-radius: 5px;
  border: 1px solid var(--border); white-space: nowrap;
}
a.link { color: var(--accent); text-decoration: none; font-weight: 600; }
a.link:hover { text-decoration: underline; }

.trouble h2 { font-size: 19px; margin: 0 0 10px; }
.trouble p { color: var(--fg-soft); font-size: 15.5px; margin: 8px 0; }

footer {
  text-align: center; color: var(--fg-faint); font-size: 13px;
  margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--border);
}