:root {
  --bg: #f3f4f6;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --primary: #1e3a8a;
  --primary-text: #ffffff;
  --ok: #15803d;
  --ok-bg: #dcfce7;
  --ng: #b91c1c;
  --ng-bg: #fee2e2;
  --border: #d1d5db;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --card: #111a2e;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --primary: #3b82f6;
    --border: #334155;
    --ok-bg: #052e16;
    --ok: #4ade80;
    --ng-bg: #450a0a;
    --ng: #f87171;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
  padding-bottom: env(safe-area-inset-bottom);
}
.hidden { display: none !important; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: calc(env(safe-area-inset-top) + 10px) 16px 10px;
  background: var(--primary); color: var(--primary-text);
}
.topbar h1 { margin: 0; font-size: 18px; font-weight: 700; }
.iconbtn {
  background: transparent; border: 0; color: inherit; font-size: 22px;
  width: 40px; height: 40px; border-radius: 20px;
}

#app { padding: 12px 16px 24px; max-width: 560px; margin: 0 auto; }

.steps { list-style: none; margin: 0 0 12px; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.step {
  background: var(--card); border: 2px solid var(--border); border-radius: 12px;
  padding: 10px 12px; display: grid; grid-template-columns: 28px 1fr; grid-template-rows: auto auto; column-gap: 8px;
}
.step.is-active { border-color: var(--primary); }
.step.is-done { border-color: var(--ok); }
.step-num {
  grid-row: 1 / span 2; width: 28px; height: 28px; border-radius: 14px; align-self: center;
  background: var(--border); color: var(--text); font-weight: 700; display: grid; place-items: center;
}
.step.is-active .step-num { background: var(--primary); color: #fff; }
.step.is-done .step-num { background: var(--ok); color: #fff; }
.step-label { font-size: 12px; color: var(--muted); }
.step-code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 15px; word-break: break-all; }

.scanner { background: var(--card); border-radius: 16px; padding: 12px; }
.instruction { margin: 0 0 10px; font-size: 16px; font-weight: 600; text-align: center; }
.viewport {
  position: relative; width: 100%; aspect-ratio: 3 / 4; max-height: 60vh;
  background: #000; border-radius: 12px; overflow: hidden;
}
#video { width: 100%; height: 100%; object-fit: cover; display: block; }
.reticle {
  position: absolute; left: 10%; right: 10%; top: 35%; bottom: 35%;
  border: 3px solid rgba(255,255,255,.9); border-radius: 10px;
  box-shadow: 0 0 0 9999px rgba(0,0,0,.35);
  pointer-events: none;
}
.reticle::after {
  content: ""; position: absolute; left: 6%; right: 6%; top: 50%; height: 2px;
  background: rgba(255,80,80,.9);
}
.flash { position: absolute; inset: 0; background: #fff; opacity: 0; pointer-events: none; transition: opacity .25s; }
.flash.on { opacity: .8; transition: none; }
.camera-msg {
  position: absolute; inset: 0; display: grid; place-items: center; text-align: center;
  padding: 24px; color: #fff; background: rgba(0,0,0,.75); font-size: 15px; line-height: 1.6;
}

.scanner-tools { display: flex; gap: 8px; margin-top: 10px; }
.scanner-tools .btn { flex: 1; }
.manual { display: flex; gap: 8px; margin-top: 10px; }
.manual input {
  flex: 1; min-width: 0; font-size: 18px; padding: 12px; border: 2px solid var(--border);
  border-radius: 10px; background: var(--bg); color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.btn {
  font-size: 16px; font-weight: 600; padding: 14px 16px; border-radius: 12px; border: 0;
  cursor: pointer; min-height: 48px;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-secondary { background: var(--card); color: var(--text); border: 2px solid var(--border); }
.btn-ghost { background: var(--bg); color: var(--text); font-size: 14px; padding: 10px 8px; }
.btn-small { padding: 8px 14px; min-height: 0; font-size: 14px; background: #fff; color: var(--primary); }
.btn:active { filter: brightness(.9); }

.result { border-radius: 16px; padding: 24px 16px; text-align: center; }
.result.ok { background: var(--ok-bg); color: var(--ok); }
.result.ng { background: var(--ng-bg); color: var(--ng); }
.result-mark { font-size: 96px; line-height: 1; font-weight: 900; }
.result h2 { margin: 8px 0 4px; font-size: 32px; }
.result-note { margin: 0 0 16px; font-size: 14px; }
.result-codes { margin: 0 0 20px; text-align: left; background: var(--card); color: var(--text); border-radius: 12px; padding: 12px; }
.result-codes div { display: grid; grid-template-columns: 72px 1fr; gap: 8px; padding: 6px 0; }
.result-codes dt { color: var(--muted); font-size: 13px; }
.result-codes dd { margin: 0; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 17px; word-break: break-all; }
.result-codes dd small { display: block; font-family: inherit; font-size: 12px; color: var(--muted); }
.result-actions { display: grid; gap: 10px; }

dialog {
  border: 0; border-radius: 16px; padding: 20px; width: min(92vw, 420px);
  background: var(--card); color: var(--text);
}
dialog::backdrop { background: rgba(0,0,0,.5); }
dialog h2 { margin: 0 0 12px; font-size: 18px; }
.toggle { display: flex; gap: 12px; align-items: flex-start; margin: 0 0 14px; font-size: 15px; line-height: 1.5; }
.toggle input { width: 22px; height: 22px; flex: none; margin-top: 2px; }
.hint { font-size: 12px; color: var(--muted); margin: 0 0 14px; }
dialog form { display: grid; }

.toast {
  position: fixed; left: 16px; right: 16px; bottom: calc(16px + env(safe-area-inset-bottom));
  background: var(--primary); color: #fff; padding: 12px 16px; border-radius: 12px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,.3);
}
.status { margin: 8px 0 0; text-align: center; font-size: 12px; color: var(--muted); min-height: 1.2em; }