:root {
  --bg: #0b0f14;
  --card: #121821;
  --card2: #0e141c;
  --line: #243140;
  --text: #e6edf3;
  --dim: #8aa0b3;
  --accent: #2563eb;
  --accent2: #1d4ed8;
  --cyan: #22d3ee;
  --ok: #22c55e;
  --warn: #f59e0b;
  --err: #ef4444;
  --radius: 12px;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding-bottom: env(safe-area-inset-bottom);
}

/* ---- top bar / tabs ---- */
.topbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; gap: 10px;
  background: rgba(11,15,20,.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; font-size: 18px; display: flex; gap: 6px; align-items: center; }
.brand span { letter-spacing: .2px; }
.tabs { display: flex; gap: 6px; background: var(--card2); padding: 4px; border-radius: 10px; }
.tab {
  border: 0; background: transparent; color: var(--dim);
  padding: 8px 14px; border-radius: 7px; font-size: 14px; font-weight: 600; cursor: pointer;
}
.tab[aria-selected="true"] { background: var(--accent); color: #fff; }

main { flex: 1; width: 100%; max-width: 560px; margin: 0 auto; padding: 14px; }
.view { display: none; }
.view.active { display: block; }

/* ---- cards ---- */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px; margin-bottom: 14px;
}
.card h2 { margin: 0 0 8px; font-size: 18px; }
.card.warn { border-color: var(--warn); background: #2a1f08; }
.card.success { border-color: var(--ok); }

/* ---- forms / buttons ---- */
.row { display: flex; gap: 8px; align-items: center; }
.grow { flex: 1; }
.lbl { display: block; margin: 12px 0 5px; font-size: 13px; color: var(--dim); }
.text, .code-input, .select, .ta {
  width: 100%; padding: 13px 12px; font-size: 16px;
  background: var(--card2); color: var(--text);
  border: 1px solid var(--line); border-radius: 9px; outline: none;
}
.text:focus, .code-input:focus, .ta:focus { border-color: var(--accent); }
.code-input { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: 3px; text-transform: uppercase; text-align: center; font-size: 20px; }
.ta { resize: vertical; min-height: 88px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; margin-top: 12px; }
.select { appearance: none; }

.btn {
  border: 1px solid var(--line); background: var(--card2); color: var(--text);
  padding: 12px 16px; border-radius: 9px; font-size: 15px; font-weight: 600; cursor: pointer;
  min-height: 46px;
}
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); border-color: var(--accent2); color: #fff; }
.btn.primary:disabled { background: #2b3a52; border-color: #2b3a52; color: #9fb0c4; cursor: not-allowed; }
.btn.big { width: 100%; margin-top: 16px; padding: 15px; font-size: 16px; }

/* ---- status ---- */
.status { display: flex; align-items: center; gap: 8px; margin-top: 12px; font-size: 14px; color: var(--dim); }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--dim); flex: none; }
.dot.ok { background: var(--ok); box-shadow: 0 0 8px var(--ok); }
.dot.wait { background: var(--warn); }
.dot.err { background: var(--err); }
.devinfo { margin-top: 8px; font-size: 12px; color: var(--dim); font-family: ui-monospace, monospace; }

/* ---- segmented control ---- */
.segmented { display: flex; background: var(--card2); border: 1px solid var(--line); border-radius: 9px; padding: 4px; }
.seg { flex: 1; border: 0; background: transparent; color: var(--dim); padding: 10px; border-radius: 6px; font-weight: 600; cursor: pointer; }
.seg.active { background: var(--accent); color: #fff; }

/* ---- key grids ---- */
.keys { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.key {
  border: 1px solid var(--line); background: var(--card2); color: var(--text);
  padding: 11px 12px; border-radius: 9px; font-size: 14px; font-weight: 600; cursor: pointer;
  min-width: 46px; min-height: 44px; flex: 1 0 auto; text-align: center;
}
.key:active { background: var(--accent); border-color: var(--accent2); color: #fff; }

/* ---- details / hints ---- */
.adv { margin-top: 12px; border-top: 1px solid var(--line); padding-top: 10px; }
.adv summary { cursor: pointer; color: var(--cyan); font-size: 14px; font-weight: 600; }
.check { display: flex; align-items: center; gap: 8px; margin: 12px 0; font-size: 14px; }
.check input { width: 18px; height: 18px; }
.hint { color: var(--dim); font-size: 13px; margin: 8px 0 0; }
.hint.small { font-size: 12px; }

/* ---- flash result ---- */
.code-display {
  font-family: ui-monospace, monospace; font-size: 34px; letter-spacing: 6px; text-align: center;
  background: var(--card2); border: 1px dashed var(--cyan); border-radius: 10px; padding: 16px; margin: 10px 0; color: var(--cyan);
}
.qr { display: flex; justify-content: center; margin: 12px 0; }
.qr img, .qr canvas { width: 180px; height: 180px; image-rendering: pixelated; background: #fff; padding: 8px; border-radius: 8px; }

/* ---- progress / log ---- */
.progress { height: 10px; background: var(--card2); border: 1px solid var(--line); border-radius: 6px; margin-top: 14px; overflow: hidden; }
.progress-bar { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--cyan)); transition: width .2s; }
.log { background: #05080c; border: 1px solid var(--line); border-radius: 8px; padding: 10px; max-height: 220px; overflow: auto; font-size: 12px; color: #9fb0c4; white-space: pre-wrap; }

.foot { text-align: center; padding: 14px; color: var(--dim); font-size: 12px; }
.foot a { color: var(--cyan); }
.hidden { display: none !important; }
.toast { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); background: var(--ok); color: #04210f; padding: 10px 16px; border-radius: 999px; font-weight: 700; font-size: 14px; opacity: 0; transition: opacity .2s; z-index: 20; }
.toast.show { opacity: 1; }