/* ===========================================================
   Routing Number Validator — styles
   Simple, professional, centered, mobile responsive.
   =========================================================== */

:root {
  --color-bg: #f4f6f8;
  --color-card: #ffffff;
  --color-text: #1f2937;
  --color-muted: #6b7280;
  --color-border: #e2e5ea;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-success-bg: #e9f9ee;
  --color-success-text: #166534;
  --color-success-border: #bbf0cc;
  --color-error-bg: #fdecec;
  --color-error-text: #991b1b;
  --color-error-border: #f6c4c4;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.04);
  padding: 40px;
  width: 100%;
  max-width: 460px;
}

.logo {
  display: block;
  height: 64px;
  width: auto;
  margin: 0 auto 16px;
}

h1 {
  margin: 0 0 8px;
  font-size: 1.5rem;
  text-align: center;
}

.subtitle {
  margin: 0 0 28px;
  color: var(--color-muted);
  text-align: center;
  font-size: 0.95rem;
}

#validator-form {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

#routing-input {
  flex: 1 1 220px;
  font-size: 1.25rem;
  letter-spacing: 0.05em;
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

#routing-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

#validate-btn {
  flex: 1 1 120px;
  font-size: 1.05rem;
  font-weight: 600;
  padding: 14px 20px;
  border: none;
  border-radius: var(--radius);
  background: var(--color-primary);
  color: #fff;
  cursor: pointer;
  transition: background 0.15s ease;
}

#validate-btn:hover {
  background: var(--color-primary-hover);
}

#validate-btn:active {
  transform: translateY(1px);
}

.result {
  margin-top: 20px;
  min-height: 0;
}

.result:empty {
  margin-top: 0;
}

.result-box {
  border-radius: var(--radius);
  padding: 14px 16px;
  font-weight: 600;
  font-size: 1.05rem;
  text-align: center;
}

.result-box.success {
  background: var(--color-success-bg);
  color: var(--color-success-text);
  border: 1px solid var(--color-success-border);
}

.result-box.error {
  background: var(--color-error-bg);
  color: var(--color-error-text);
  border: 1px solid var(--color-error-border);
}

.result-box.pending {
  background: #f3f4f6;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
}

.result-message {
  display: block;
  margin-top: 4px;
  font-weight: 400;
  font-size: 0.9rem;
}

.details {
  margin-top: 20px;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.details dl {
  display: grid;
  grid-template-columns: auto 1fr;
  row-gap: 10px;
  column-gap: 16px;
  margin: 0;
}

.details dt {
  color: var(--color-muted);
  font-size: 0.85rem;
  white-space: nowrap;
}

.details dd {
  margin: 0;
  font-weight: 600;
  text-align: right;
}

.cache-actions {
  margin-top: 20px;
  text-align: center;
}

#export-cache-btn {
  background: none;
  border: none;
  color: var(--color-muted);
  font-size: 0.8rem;
  text-decoration: underline;
  cursor: pointer;
  padding: 4px;
}

#export-cache-btn:hover {
  color: var(--color-primary);
}

.footer {
  margin-top: 20px;
  color: var(--color-muted);
  font-size: 0.8rem;
  text-align: center;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@media (max-width: 480px) {
  .card {
    padding: 28px 20px;
  }

  #validator-form {
    flex-direction: column;
  }

  .details dl {
    grid-template-columns: 1fr;
    row-gap: 4px;
  }

  .details dd {
    text-align: left;
    margin-bottom: 8px;
  }
}