:root {
  color-scheme: light;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #d7ddea;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --danger: #b91c1c;
  --danger-bg: #fef2f2;
  --safe: #166534;
  --safe-bg: #f0fdf4;
  --error-bg: #fff7ed;
  --error: #c2410c;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: linear-gradient(180deg, #eef3ff 0%, var(--bg) 100%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.checker-shell {
  min-height: 100vh;
  padding: 24px 16px;
}

.checker-layout {
  width: min(100%, 1440px);
  margin: 0 auto;
  display: grid;
  gap: 20px;
}

.checker-card {
  width: 100%;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 16px 44px rgba(15, 23, 42, 0.08);
}

.checker-card-info,
.checker-card-action {
  min-width: 0;
}

@media (min-width: 1080px) {
  .checker-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .checker-card-info,
  .checker-card-action {
    min-height: calc(100vh - 48px);
  }
}

.checker-eyebrow {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.checker-card h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.1;
}

.checker-panel-title {
  margin: 0;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.2;
}

.checker-intro,
.checker-note {
  color: var(--muted);
  line-height: 1.7;
}

.checker-intro { margin: 14px 0 0; }
.checker-note { margin: 8px 0 0; font-size: 14px; }

.checker-banner,
.checker-result-box {
  margin-top: 20px;
  border-radius: 14px;
  padding: 16px 18px;
  border: 1px solid var(--border);
}

.checker-banner-danger {
  background: var(--danger-bg);
  border-color: #fecaca;
  color: var(--danger);
}

.checker-banner-safe {
  background: var(--safe-bg);
  border-color: #bbf7d0;
  color: var(--safe);
}

.checker-banner-notice {
  background: #eff6ff;
  border-color: #bfdbfe;
  color: #1d4ed8;
}

.checker-banner-error {
  background: var(--error-bg);
  border-color: #fed7aa;
  color: var(--error);
}

.checker-result-box h2 {
  margin: 0 0 12px;
  font-size: 18px;
}

.checker-result-grid {
  display: grid;
  gap: 16px;
  margin-top: 20px;
}

@media (min-width: 760px) {
  .checker-result-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.checker-result-list {
  margin: 0;
  padding-left: 20px;
  line-height: 1.8;
}

.checker-empty {
  margin: 0;
  color: var(--muted);
}

.checker-inline-note,
.checker-disclaimer {
  color: var(--muted);
  font-size: 14px;
}

.checker-disclaimer {
  margin: 12px 0 0;
}

.checker-result-summary {
  margin-top: 16px;
}

.checker-watchlist-box {
  margin-top: 24px;
}

.checker-watchlist {
  margin: 16px 0 0;
  padding-left: 20px;
  line-height: 1.7;
  max-height: calc(100vh - 280px);
  overflow: auto;
}

.checker-watchlist li + li {
  margin-top: 6px;
}

.checker-watchlist-slug {
  color: var(--muted);
  font-size: 14px;
  word-break: break-word;
}

.checker-form {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.checker-form.is-submitting {
  opacity: 0.92;
}

.checker-label {
  font-weight: 600;
}

.checker-form textarea {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  font: inherit;
  line-height: 1.6;
  min-height: 320px;
}

.checker-form textarea:focus {
  outline: 2px solid rgba(37, 99, 235, 0.2);
  border-color: var(--accent);
}

.checker-form button {
  justify-self: start;
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  padding: 12px 20px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.checker-form button:hover {
  background: var(--accent-hover);
}

.checker-form button:disabled {
  background: #93c5fd;
  cursor: wait;
}

.checker-form textarea:disabled {
  background: #f8fafc;
  cursor: wait;
}

.checker-form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.checker-loading {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
}

.checker-loading[hidden] {
  display: none;
}

.checker-loading-spinner {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  border: 2px solid #bfdbfe;
  border-top-color: var(--accent);
  animation: checker-spin 0.8s linear infinite;
  flex: 0 0 auto;
}

@keyframes checker-spin {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}