:root {
  --navy: #1f4e79;
  --navy-dark: #163a5a;
  --orange: #e8562a;
  --yellow: #f5c242;
  --teal: #2a6f8f;
  --green: #1e8a4c;
  --red: #c0392b;
  --ink: #1d2733;
  --muted: #5b6878;
  --line: #dde3ea;
  --bg: #f5f7fa;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(22, 58, 90, 0.08);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { background: var(--bg); color: var(--ink); line-height: 1.55; -webkit-font-smoothing: antialiased; }
a { color: var(--navy); }
code { background: #eef2f6; padding: 2px 6px; border-radius: 6px; font-size: 0.92em; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.container { width: 100%; max-width: 1000px; margin: 0 auto; padding: 0 16px; }

/* Header */
.site-header { background: var(--card); border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 16px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.brand-logo { width: 44px; height: 44px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-weight: 800; letter-spacing: 0.02em; font-size: 1.05rem; }
.brand-sub { font-size: 0.78rem; color: var(--muted); font-weight: 500; }
.header-tag { font-size: 0.8rem; font-weight: 600; color: var(--navy); background: #e8f0f8; padding: 6px 12px; border-radius: 999px; white-space: nowrap; }
.header-stripe { height: 6px; background: linear-gradient(90deg, var(--navy) 0 25%, var(--teal) 25% 50%, var(--yellow) 50% 75%, var(--orange) 75% 100%); }

/* Hero */
.hero { padding: 44px 0 20px; text-align: center; }
.hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 0 0 10px; color: var(--navy); font-weight: 800; }
.lead { max-width: 640px; margin: 0 auto 24px; color: var(--muted); font-size: 1.05rem; }
.search-form { display: flex; gap: 10px; max-width: 620px; margin: 0 auto; }
.search-form input { flex: 1; min-width: 0; font: inherit; font-size: 1.05rem; padding: 14px 16px; border: 2px solid var(--line); border-radius: 12px; background: var(--card); color: var(--ink); }
.search-form input:focus { outline: none; border-color: var(--navy); box-shadow: 0 0 0 4px rgba(31, 78, 121, 0.15); }
.search-form button, .btn { font: inherit; font-weight: 700; font-size: 1rem; padding: 14px 22px; border: 0; border-radius: 12px; background: var(--navy); color: #fff; cursor: pointer; transition: background .15s; text-decoration: none; display: inline-block; }
.search-form button:hover, .btn:hover { background: var(--navy-dark); }
.search-form button:disabled { opacity: .6; cursor: default; }
.btn.secondary { background: #e8f0f8; color: var(--navy); }
.btn.secondary:hover { background: #d8e5f2; }
.hint { color: var(--muted); font-size: 0.9rem; margin-top: 12px; }

/* Result */
.result { margin: 24px auto 0; max-width: 820px; }
.banner { display: flex; align-items: center; gap: 14px; padding: 16px 20px; border-radius: var(--radius); font-weight: 700; font-size: 1.1rem; }
.banner .icon { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; flex-shrink: 0; color: #fff; font-size: 1.1rem; }
.banner.valid { background: #e6f5ec; color: #14532d; border: 1px solid #b8e2c8; }
.banner.valid .icon { background: var(--green); }
.banner.revoked { background: #fdecea; color: #7f1d1d; border: 1px solid #f5c2bd; }
.banner.revoked .icon { background: var(--red); }
.banner.notfound { background: #fff6e0; color: #7a4a00; border: 1px solid #f3dca0; }
.banner.notfound .icon { background: #d9960d; }
.banner.error { background: #eef2f6; color: var(--ink); border: 1px solid var(--line); }
.banner.error .icon { background: var(--muted); }
.banner small { display: block; font-weight: 500; font-size: 0.9rem; opacity: .9; }

.cert-card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); margin-top: 16px; overflow: hidden; border-top: 6px solid var(--navy); }
.cert-card.revoked { border-top-color: var(--red); }
.cert-body { display: grid; grid-template-columns: 1fr 200px; gap: 24px; padding: 26px; }
.cert-main h2 { margin: 0 0 4px; font-size: 1.7rem; color: var(--navy); font-weight: 800; }
.cert-main .program { margin: 0 0 18px; color: var(--muted); font-weight: 600; }
.details { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px 20px; margin: 0; }
.details div { min-width: 0; }
.details dt { font-size: 0.74rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 700; margin-bottom: 2px; }
.details dd { margin: 0; font-weight: 600; word-break: break-word; }
.details dd.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.95rem; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }
.chip { background: #eef2f6; color: var(--navy); padding: 5px 11px; border-radius: 999px; font-size: 0.85rem; font-weight: 600; }
.cert-side { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.qr { background: #fff; padding: 8px; border: 1px solid var(--line); border-radius: 10px; }
.qr img, .qr canvas { display: block; width: 160px; height: 160px; }
.qr-label { font-size: 0.78rem; color: var(--muted); text-align: center; }
.cert-actions { display: flex; flex-wrap: wrap; gap: 10px; padding: 0 26px 24px; }
.cert-actions .btn { padding: 11px 16px; font-size: 0.92rem; }
.revoke-note { margin: 0 26px 22px; padding: 12px 14px; background: #fdecea; color: #7f1d1d; border-radius: 10px; font-size: 0.95rem; }

.match-list { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 10px; }
.match-list li a { display: flex; justify-content: space-between; gap: 12px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; text-decoration: none; color: var(--ink); font-weight: 600; }
.match-list li a:hover { border-color: var(--navy); }
.match-list .meta { color: var(--muted); font-weight: 500; font-size: 0.9rem; }

/* How it works */
.how { padding: 48px 0 30px; }
.how h2 { text-align: center; color: var(--navy); margin: 0 0 22px; font-size: 1.5rem; }
.how-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.how-item { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.how-num { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--yellow); color: var(--ink); font-weight: 800; margin-bottom: 10px; }
.how-item h3 { margin: 0 0 6px; font-size: 1.05rem; }
.how-item p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); background: var(--card); margin-top: 20px; }
.footer-inner { padding: 24px 16px; text-align: center; font-size: 0.92rem; }
.footer-inner p { margin: 4px 0; }
.muted { color: var(--muted); }

@media (max-width: 680px) {
  .header-tag { display: none; }
  .search-form { flex-direction: column; }
  .cert-body { grid-template-columns: 1fr; }
  .cert-side { order: -1; }
}

@media print {
  .site-header, .hero, .how, .site-footer, .cert-actions { display: none !important; }
  body { background: #fff; }
  .cert-card { box-shadow: none; border: 1px solid #999; }
}