:root { --bg: #EEEFF1; --card: #FFFFFF; --soft: #F5F5F6; --ink: #111113; --ink-2: #5C5F66; --ink-3: #9A9DA4; --line: #E3E4E7; --line-2: #D4D6DA; --red: #D93A2B; --dot: #2F6BFF;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", system-ui, sans-serif; --display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", system-ui, sans-serif }
@media (prefers-color-scheme: dark) { :root { --bg: #0D0D0F; --card: #19191C; --soft: #202024; --ink: #F2F2F4; --ink-2: #A3A6AD; --ink-3: #6E7178; --line: #2A2A2F; --line-2: #36363C; --red: #FF6B5F; --dot: #5B8CFF; color-scheme: dark } }
* { box-sizing: border-box }
html, body { height: 100% }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.45 var(--font); -webkit-font-smoothing: antialiased; display: grid; place-items: center; padding: 24px 16px }
.box { width: 100%; max-width: 380px; background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 32px 28px 26px; box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 12px 40px -18px rgba(0,0,0,.18) }
.logo { width: 40px; height: 40px; border-radius: 11px; background: var(--ink); color: var(--card); display: grid; place-items: center; font: 700 18px var(--display); margin-bottom: 18px }
h1 { font: 700 24px/1.2 var(--display); letter-spacing: -0.02em; margin: 0 }
.sub { color: var(--ink-2); margin: 6px 0 18px; font-size: 14px }
.sub:empty { display: none }
form { display: flex; flex-direction: column; gap: 12px; margin-top: 18px }
label { display: flex; flex-direction: column; gap: 5px; font-size: 13px; font-weight: 600; color: var(--ink-2) }
input { height: 44px; border: 1px solid var(--line-2); border-radius: 11px; background: var(--soft); padding: 0 13px; font: 16px var(--font); color: var(--ink); outline: none }
input:focus { border-color: var(--ink-3); background: var(--card) }
input.code { font-size: 24px; letter-spacing: .3em; text-align: center; font-variant-numeric: tabular-nums }
button { height: 46px; border: 0; border-radius: 11px; background: var(--ink); color: var(--card); font: 600 15px var(--font); cursor: pointer; margin-top: 6px }
button:disabled { opacity: .55; cursor: default }
.err { color: var(--red); font-size: 14px; margin: 12px 0 0; min-height: 0 }
.err:empty { display: none }
.qr { background: #fff; border-radius: 14px; padding: 10px; width: 200px; height: 200px; margin: 4px auto 0; display: grid; place-items: center }
.qr svg { width: 180px; height: 180px }
.secret { font: 13px ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--ink-2); text-align: center; word-break: break-all; user-select: all }
.hint { font-size: 13px; color: var(--ink-2); margin: 0 }
ol.hint { padding-left: 18px; display: flex; flex-direction: column; gap: 4px }