:root {
  --bg: #f8f9fb;
  --surface: #ffffff;
  --text: #1f1f1f;
  --muted: #5f6368;
  --border: #e3e5e8;
  --primary: #1a73e8;
  --on-primary: #ffffff;
  --ok: #188038;
  --ok-bg: #e6f4ea;
  --bad: #d93025;
  --bad-bg: #fce8e6;
  --neutral: #5f6368;
  --neutral-bg: #f1f3f4;
  --chip: #f1f3f4;
  --shadow: 0 1px 2px rgba(60,64,67,.12), 0 2px 8px rgba(60,64,67,.10);
  --radius: 20px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Noto Sans Bengali", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Roboto Mono", Menlo, Consolas, monospace;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --surface: #1c1f24;
    --text: #e8eaed;
    --muted: #9aa0a6;
    --border: #2f343b;
    --primary: #8ab4f8;
    --on-primary: #0b1d3a;
    --ok: #81c995;
    --ok-bg: #16301e;
    --bad: #f28b82;
    --bad-bg: #3a1a18;
    --neutral: #9aa0a6;
    --neutral-bg: #262a30;
    --chip: #262a30;
    --shadow: 0 1px 3px rgba(0,0,0,.5);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 var(--font);
  min-height: 100vh;
}
a { color: var(--primary); }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 560px; margin: 0 auto; padding: 14px 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 18px; color: var(--text); text-decoration: none; }
.brand svg { width: 28px; height: 28px; }

.lang { display: inline-flex; border: 1px solid var(--border); border-radius: 999px; overflow: hidden; background: var(--surface); }
.lang button {
  font: inherit; font-size: 14px; border: 0; background: transparent; color: var(--muted);
  padding: 6px 12px; cursor: pointer; min-height: 36px;
}
.lang button[aria-pressed="true"] { background: var(--chip); color: var(--text); font-weight: 600; }

main { max-width: 560px; margin: 0 auto; padding: 4px 16px 40px; }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 28px 20px; margin-bottom: 16px;
}

.status { text-align: center; }
.status-icon {
  width: 88px; height: 88px; border-radius: 50%; margin: 0 auto 16px;
  display: grid; place-items: center;
}
.status-icon svg { width: 52px; height: 52px; }
.status.valid .status-icon { background: var(--ok-bg); color: var(--ok); }
.status.invalid .status-icon { background: var(--bad-bg); color: var(--bad); }
.status.notours .status-icon { background: var(--neutral-bg); color: var(--neutral); }
.status h1 { font-size: 22px; line-height: 1.3; margin: 0 0 8px; font-weight: 600; }
.status.valid h1 { color: var(--ok); }
.status.invalid h1 { color: var(--bad); }
.sealed-by { margin: 0; font-size: 17px; overflow-wrap: anywhere; }
.hint { color: var(--muted); font-size: 14px; margin: 16px 0 8px; }

.issuer {
  display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap;
}
.issuer code {
  font-family: var(--mono); font-size: 20px; letter-spacing: .04em; font-weight: 600;
  background: var(--chip); padding: 6px 12px; border-radius: 10px;
}
.btn-text {
  font: inherit; font-size: 14px; color: var(--primary); background: transparent;
  border: 1px solid var(--border); border-radius: 999px; padding: 6px 14px; cursor: pointer; min-height: 36px;
}

h2 { font-size: 15px; font-weight: 600; color: var(--muted); margin: 0 0 12px; }
dl.details { margin: 0; }
dl.details div {
  display: grid; grid-template-columns: minmax(110px, 40%) 1fr; gap: 12px;
  padding: 12px 0; border-top: 1px solid var(--border);
}
dl.details div:first-child { border-top: 0; padding-top: 0; }
dl.details dt { color: var(--muted); font-size: 14px; }
dl.details dd { margin: 0; font-weight: 500; overflow-wrap: anywhere; }

.btn {
  display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%;
  font: inherit; font-weight: 600; text-decoration: none; cursor: pointer;
  background: var(--primary); color: var(--on-primary); border: 0; border-radius: 999px;
  padding: 14px 20px; min-height: 48px;
}
.btn.secondary { background: transparent; color: var(--primary); border: 1px solid var(--border); margin-top: 10px; }
.footnote { text-align: center; color: var(--muted); font-size: 13px; margin: 12px 8px 0; }

textarea {
  width: 100%; min-height: 120px; resize: vertical; font: 14px/1.4 var(--mono);
  color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 12px;
  padding: 12px; margin: 8px 0 14px;
}
textarea:focus, .btn:focus-visible, .btn-text:focus-visible, .lang button:focus-visible {
  outline: 2px solid var(--primary); outline-offset: 2px;
}

.hero { text-align: center; padding: 16px 0 8px; }
.hero h1 { font-size: 28px; line-height: 1.25; margin: 12px 0 8px; }
.hero p { color: var(--muted); margin: 0 auto 20px; max-width: 440px; }
.hero .seal { width: 96px; height: 96px; margin: 0 auto; color: var(--ok); }
.steps { list-style: none; padding: 0; margin: 0; }
.steps li { display: flex; gap: 14px; padding: 12px 0; border-top: 1px solid var(--border); }
.steps li:first-child { border-top: 0; padding-top: 0; }
.steps .n {
  flex: none; width: 28px; height: 28px; border-radius: 50%; background: var(--chip);
  display: grid; place-items: center; font-weight: 600; font-size: 14px;
}
.steps h3 { margin: 0 0 2px; font-size: 16px; }
.steps p { margin: 0; color: var(--muted); font-size: 14px; }

[hidden] { display: none !important; }
.brand svg { color: var(--ok); }
.paste-title { font-size: 22px; margin: 0 0 6px; }
.hint.flush { margin-top: 0; }
.hint.label { display: block; margin: 0; }