:root {
  --ee-blue: #0072ce;
  --ee-black: #101010;
  --ee-white: #f5f5f5;
  --bg: #0b0d10;
  --bg-elev: #14171b;
  --border: #262b31;
  --text: #eceef0;
  --text-muted: #9aa3ad;
  --accent: #4aa8ff;
  --accent-soft: rgba(74, 168, 255, 0.12);
  --good: #35c26a;
  --good-soft: rgba(53, 194, 106, 0.12);
  --bad: #e0525f;
  --bad-soft: rgba(224, 82, 95, 0.12);
  --radius: 14px;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f4f6f8;
    --bg-elev: #ffffff;
    --border: #dde2e7;
    --text: #16191c;
    --text-muted: #5b6570;
    --accent: #0072ce;
    --accent-soft: rgba(0, 114, 206, 0.08);
    --good: #1e8e4c;
    --good-soft: rgba(30, 142, 76, 0.1);
    --bad: #c8323e;
    --bad-soft: rgba(200, 50, 62, 0.08);
    color-scheme: light;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

.bg-flag {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 15% -10%, var(--accent-soft), transparent 55%),
    linear-gradient(var(--bg), var(--bg));
  pointer-events: none;
}

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 16px 32px;
}

.hero {
  text-align: center;
  margin-bottom: 32px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(26px, 5vw, 34px);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.sub {
  margin: 0 auto;
  max-width: 46ch;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.5;
}

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

.field-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.input-row {
  display: flex;
  gap: 8px;
}

#idInput {
  flex: 1;
  min-width: 0;
  font-family: "SF Mono", "Cascadia Code", Consolas, monospace;
  font-size: 20px;
  letter-spacing: 0.06em;
  padding: 14px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

#idInput:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.ghost-btn {
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 600;
  padding: 0 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.ghost-btn:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.help {
  margin: 10px 0 0;
  font-size: 12.5px;
  color: var(--text-muted);
}

.result {
  margin-bottom: 20px;
  animation: rise 0.2s ease;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.status-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 12px;
}

.status-banner.ok {
  background: var(--good-soft);
  color: var(--good);
  border: 1px solid var(--good);
}

.status-banner.bad {
  background: var(--bad-soft);
  color: var(--bad);
  border: 1px solid var(--bad);
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.stat {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat-value {
  font-size: 17px;
  font-weight: 700;
}

#copyBtn {
  margin-top: 14px;
  width: 100%;
}

.explainer {
  margin-bottom: 24px;
}

details {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 20px;
}

summary {
  cursor: pointer;
  padding: 14px 0;
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
}

.explainer-body {
  padding-bottom: 16px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-muted);
}

.explainer-body code {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 5px;
  font-size: 13px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 13px;
}

th, td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  color: var(--text-muted);
  font-weight: 600;
}

.muted {
  font-size: 12.5px;
  opacity: 0.85;
}

.footer {
  text-align: center;
  font-size: 12.5px;
  color: var(--text-muted);
}

.footer a {
  color: var(--accent);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 420px) {
  .grid { grid-template-columns: 1fr; }
  #idInput { font-size: 17px; }
}