/* Single dark look on purpose: the app is mostly a camera viewfinder. */
:root {
  --bg: #0b0d12; --surface: #151922; --line: #262c38; --fg: #eef1f6; --muted: #98a1b3;
  --accent: #4f8cff; --ok: #35c47a; --warn: #f0b041; --bad: #ff6464; --guide: rgba(255,255,255,.85);
  color-scheme: dark;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
* { box-sizing: border-box }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--fg) }
[hidden] { display: none !important }
.view { min-height: 100%; }
.wrap { max-width: 560px; margin: 0 auto; display: grid; gap: 16px;
  padding: max(20px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(28px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left)) }
.brand { font-weight: 800; letter-spacing: .02em }
h1 { font-size: 26px; line-height: 1.15; margin: 0; text-wrap: balance }
h2 { font-size: 14px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 8px 0 0 }
p { margin: 0 }
.muted { color: var(--muted) } .small { font-size: 13px }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 16px; display: grid; gap: 12px }
label { display: grid; gap: 6px; font-size: 14px; color: var(--muted) }
input { font: inherit; color: var(--fg); background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 12px; width: 100%; min-width: 0 }
input:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px }
.btn { appearance: none; font: 600 16px/1 system-ui, sans-serif; color: var(--fg); background: var(--surface); border: 1px solid var(--line);
  border-radius: 12px; padding: 15px 16px; cursor: pointer; width: 100% }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff }
.btn.big { padding: 18px 16px; font-size: 17px }
.btn:disabled { opacity: .5 }
.link { appearance: none; background: none; border: 0; color: var(--accent); font: inherit; cursor: pointer; padding: 6px 0 }
.top { display: flex; justify-content: space-between; align-items: center }
.actions, .row2 { display: grid; gap: 10px } .row2 { grid-template-columns: 1fr 1fr }
.tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 6px }
.tab { appearance: none; font: 600 15px system-ui, sans-serif; color: var(--muted); background: transparent; border: 1px solid var(--line); border-radius: 10px; padding: 10px; cursor: pointer }
.tab[aria-selected="true"] { color: var(--fg); border-color: var(--accent) }
.err { color: var(--bad); font-size: 14px }
.seg { display: grid; gap: 8px } .seg label { display: flex; align-items: center; gap: 8px; color: var(--fg); font-size: 15px }
.seg input { width: auto }
.list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px }
.list li { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; display: grid; grid-template-columns: 1fr auto; gap: 2px 10px; align-items: center }
.list .code { font: 600 14px ui-monospace, Menlo, Consolas, monospace; color: var(--muted) }
.list a { color: var(--accent); text-decoration: none; grid-row: span 2 }
.tips ul { margin: 0; padding-left: 18px; display: grid; gap: 4px; color: var(--muted); font-size: 14px }
#rv-img { width: 100%; max-height: 62vh; object-fit: contain; border-radius: 12px; background: #000 }

/* camera */
.cam { position: fixed; inset: 0; background: #000; overflow: hidden }
#video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover }
#overlay { position: absolute; inset: 0; width: 100%; height: 100% }
.cam-top { position: absolute; top: 0; left: 0; right: 0; display: flex; justify-content: space-between; align-items: center;
  padding: max(12px, env(safe-area-inset-top)) max(14px, env(safe-area-inset-right)) 12px max(14px, env(safe-area-inset-left)) }
.pill { appearance: none; border: 0; border-radius: 999px; background: rgba(0,0,0,.55); color: #fff; font: 600 14px system-ui, sans-serif; padding: 10px 14px; cursor: pointer; min-width: 44px }
.step { background: rgba(0,0,0,.55); border-radius: 999px; padding: 8px 14px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; font-size: 13px }
.challenge { position: absolute; left: 50%; transform: translateX(-50%); top: calc(max(12px, env(safe-area-inset-top)) + 56px);
  background: rgba(0,0,0,.55); border-radius: 8px; padding: 4px 10px; font: 700 15px ui-monospace, monospace; letter-spacing: .2em }
.cam-bottom { position: absolute; left: 0; right: 0; bottom: 0; display: grid; justify-items: center; gap: 10px;
  padding: 16px max(16px, env(safe-area-inset-right)) max(22px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  background: linear-gradient(transparent, rgba(0,0,0,.65)) }
.hint { font-weight: 700; font-size: 17px; text-align: center; text-shadow: 0 1px 3px #000 }
.meters { display: flex; gap: 14px; font-size: 13px; color: #dfe4ee; text-shadow: 0 1px 2px #000; font-variant-numeric: tabular-nums }
.shutter { width: 72px; height: 72px; border-radius: 50%; border: 4px solid #fff; background: rgba(255,255,255,.25); cursor: pointer }
.shutter:active { background: rgba(255,255,255,.6) }
.flash { position: absolute; inset: 0; background: #fff; opacity: .8; pointer-events: none }

/* result */
.badge { display: inline-block; font-weight: 800; letter-spacing: .06em; font-size: 13px; padding: 4px 10px; border-radius: 6px; background: var(--ok); color: #04150b }
.badge.bad { background: var(--bad); color: #1d0505 } .badge.warn { background: var(--warn); color: #1d1405 }
.res-code { font: 700 28px ui-monospace, Menlo, Consolas, monospace }
.res-img { width: 100%; border-radius: 10px }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; font-size: 14px } .kv dt { color: var(--muted) } .kv dd { margin: 0 }
.spinner { width: 28px; height: 28px; border: 3px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite }
@keyframes spin { to { transform: rotate(360deg) } }
@media (prefers-reduced-motion: reduce) { .spinner { animation-duration: 3s } }

/* corner steps */
.howto svg { width: 100%; height: auto; border-radius: 10px; background: #10141b }
.howto ol { margin: 0; padding-left: 20px; display: grid; gap: 6px; font-size: 15px }
.cam-map { position: absolute; right: max(14px, env(safe-area-inset-right)); top: calc(max(12px, env(safe-area-inset-top)) + 56px);
  background: rgba(0,0,0,.6); border-radius: 10px; padding: 8px; display: grid; justify-items: center; gap: 4px; font-size: 12px; font-weight: 700 }
.cam-map svg { width: 46px; height: 64px; display: block }
.verdict-list { margin: 0; padding-left: 18px; font-size: 14px; color: var(--muted) }

/* native camera step */
.vh { position: absolute; width: 1px; height: 1px; opacity: 0; overflow: hidden; clip: rect(0 0 0 0) }
label.btn { display: block; text-align: center }
.step-pill { font-weight: 700; letter-spacing: .04em; font-size: 13px; color: var(--muted); text-transform: uppercase }
.challenge-inline { font: 700 18px ui-monospace, monospace; letter-spacing: .2em; color: var(--muted) }