:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --card-2: #eef1f7;
  --text: #0f172a;
  --muted: #5b6577;
  --line: rgba(15, 23, 42, 0.08);
  --accent: #2973fa;
  --accent-ink: #ffffff;
  --accent-soft: rgba(41, 115, 250, 0.1);
  --good: #16a865;
  --warn: #e08a00;
  --bad: #dc3b3b;
  --radius: 18px;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 8px 24px rgba(15, 23, 42, 0.06);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --card: #151b2e;
    --card-2: #1d2540;
    --text: #eef2fb;
    --muted: #9aa5bd;
    --line: rgba(255, 255, 255, 0.08);
    --accent: #4b8dff;
    --accent-soft: rgba(75, 141, 255, 0.16);
    --good: #2fd087;
    --shadow: none;
  }
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  font: 17px/1.4 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
}
main {
  max-width: 520px;
  margin: 0 auto;
  padding: calc(env(safe-area-inset-top) + 12px) 16px calc(env(safe-area-inset-bottom) + 32px);
}
h1 { font-size: 30px; line-height: 1.15; margin: 0 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 22px; margin: 0 0 6px; letter-spacing: -0.01em; }
h3 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); margin: 26px 4px 8px; font-weight: 600; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.tiny { font-size: 12px; }
.center { display: grid; place-items: center; min-height: 60dvh; text-align: center; }
.mono { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-variant-numeric: tabular-nums; }

/* top bar */
.bar { display: flex; align-items: center; justify-content: space-between; min-height: 44px; margin-bottom: 8px; }
.bar .title { font-weight: 700; font-size: 17px; display: flex; gap: 8px; align-items: center; }
.bar .title img { width: 26px; height: 26px; border-radius: 7px; }
.icon-btn {
  appearance: none; border: 0; background: var(--card); color: var(--accent);
  width: 40px; height: 40px; border-radius: 999px; font-size: 18px; box-shadow: var(--shadow);
  display: grid; place-items: center; cursor: pointer;
}
.back { appearance: none; border: 0; background: none; color: var(--accent); font: inherit; padding: 8px 0; cursor: pointer; }

/* buttons */
.btn {
  appearance: none; border: 0; cursor: pointer; width: 100%;
  min-height: 54px; border-radius: 16px; font: 600 17px/1 inherit; font-family: inherit;
  background: var(--accent); color: var(--accent-ink); padding: 0 18px;
  display: flex; align-items: center; justify-content: center; gap: 10px; text-decoration: none;
  transition: transform 0.12s ease, opacity 0.12s ease;
}
.btn:active { transform: scale(0.98); }
.btn[disabled] { opacity: 0.5; }
.btn.secondary { background: var(--accent-soft); color: var(--accent); }
.btn.plain { background: none; color: var(--accent); min-height: 44px; }
.btn.danger { background: none; color: var(--bad); }
.stack > * + * { margin-top: 10px; }

/* cards & lists */
.card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; }
.list { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.row {
  display: flex; align-items: center; gap: 12px; padding: 13px 16px; min-height: 54px;
  border: 0; background: none; width: 100%; text-align: left; font: inherit; color: inherit; cursor: pointer;
}
.row + .row { border-top: 1px solid var(--line); }
.row .flag { font-size: 28px; line-height: 1; width: 34px; text-align: center; }
.row .grow { flex: 1; min-width: 0; }
.row .sub { font-size: 13px; color: var(--muted); }
.row .chev { color: var(--muted); }
.row.selected .check { color: var(--accent); font-weight: 700; }
.row[aria-disabled="true"] { opacity: 0.55; }

/* hero */
.hero { text-align: center; padding: 28px 8px 8px; }
.hero .logo { width: 88px; height: 88px; border-radius: 22px; box-shadow: 0 12px 30px rgba(41, 115, 250, 0.35); }
.features { list-style: none; padding: 0; margin: 24px 0; }
.features li { display: flex; gap: 12px; align-items: center; padding: 8px 4px; }
.features .ico { width: 34px; height: 34px; border-radius: 10px; background: var(--accent-soft); display: grid; place-items: center; flex: none; }

/* status */
.status { display: flex; align-items: center; gap: 14px; }
.status .dot { width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center; font-size: 22px; background: var(--accent-soft); flex: none; }
.status.ready .dot { background: rgba(22, 168, 101, 0.14); }

/* segmented control */
.seg { display: grid; grid-template-columns: repeat(3, 1fr); background: var(--card-2); border-radius: 12px; padding: 3px; gap: 3px; }
.seg button {
  appearance: none; border: 0; background: none; color: var(--text); font: 600 13px/1.2 inherit; font-family: inherit;
  padding: 9px 4px; border-radius: 9px; cursor: pointer;
}
.seg button[aria-pressed="true"] { background: var(--card); box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12); color: var(--accent); }

/* load bar */
.load { width: 30px; height: 5px; border-radius: 3px; background: var(--card-2); overflow: hidden; flex: none; }
.load > span { display: block; height: 100%; background: var(--good); border-radius: 3px; }
.load.mid > span { background: var(--warn); }
.load.high > span { background: var(--bad); }

/* search */
.search {
  width: 100%; border: 0; border-radius: 12px; background: var(--card-2); color: var(--text);
  font: inherit; padding: 11px 14px; margin: 4px 0 4px; outline: none;
}
.search:focus { box-shadow: 0 0 0 3px var(--accent-soft); }

/* steps */
.steps { list-style: none; padding: 0; margin: 0; counter-reset: step; }
.steps.card { padding: 20px 16px 2px; }
.steps > li { counter-increment: step; position: relative; padding: 0 0 22px 46px; }
.steps > li::before {
  content: counter(step); position: absolute; left: 0; top: -2px; width: 32px; height: 32px; border-radius: 999px;
  background: var(--accent); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 15px;
}
.steps > li:not(:last-child)::after { content: ""; position: absolute; left: 15px; top: 34px; bottom: 4px; width: 2px; background: var(--line); }
.steps strong { display: block; margin-bottom: 4px; }

/* account number */
.number { font-size: 26px; font-weight: 600; letter-spacing: 0.04em; text-align: center; padding: 18px 8px; background: var(--card-2); border-radius: 14px; user-select: all; -webkit-user-select: all; }
input.number { width: 100%; border: 0; color: var(--text); font-family: ui-monospace, "SF Mono", Menlo, monospace; outline: none; }
input.number:focus { box-shadow: 0 0 0 3px var(--accent-soft); }

details { margin-top: 12px; }
details summary { cursor: pointer; color: var(--accent); font-weight: 600; padding: 8px 0; list-style: none; }
details summary::-webkit-details-marker { display: none; }
pre.config { white-space: pre-wrap; word-break: break-all; font-size: 12px; background: var(--card-2); border-radius: 12px; padding: 12px; margin: 8px 0 0; }
.qr { background: #fff; border-radius: 14px; padding: 12px; width: min(100%, 300px); margin: 8px auto 0; }
.qr svg { display: block; width: 100%; height: auto; }

.banner { display: flex; gap: 12px; align-items: flex-start; background: var(--accent-soft); border-radius: var(--radius); padding: 14px 16px; margin-top: 16px; }
.banner .ico { font-size: 20px; }

.pill { display: inline-block; font-size: 12px; font-weight: 600; padding: 3px 8px; border-radius: 999px; background: var(--card-2); color: var(--muted); }
.pill.good { background: rgba(22, 168, 101, 0.14); color: var(--good); }

#toast {
  position: fixed; left: 50%; bottom: calc(env(safe-area-inset-bottom) + 24px); transform: translateX(-50%);
  background: rgba(15, 23, 42, 0.92); color: #fff; padding: 12px 18px; border-radius: 14px; font-size: 15px;
  max-width: calc(100% - 32px); box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25); z-index: 10;
}

.spinner { width: 28px; height: 28px; border-radius: 50%; border: 3px solid var(--accent-soft); border-top-color: var(--accent); animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation-duration: 2.4s; } .btn { transition: none; } }