*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: #1a1a2e;
  background: #f4f6fb;
  line-height: 1.5;
}

.site-header {
  padding: 1.25rem 1.5rem;
  background: #1a1a2e;
  color: #fff;
}

.site-header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.35rem;
}

.site-header p {
  margin: 0;
  opacity: 0.85;
  font-size: 0.95rem;
}

.home {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem;
}

.page-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.page-card {
  display: block;
  padding: 1.25rem;
  border-radius: 12px;
  background: #fff;
  border: 1px solid #dde3f0;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.page-card:hover {
  border-color: #4f6ef7;
  box-shadow: 0 8px 24px rgba(79, 110, 247, 0.12);
}

.page-card__label {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #4f6ef7;
}

.page-card strong {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 1.1rem;
}

.page-card code {
  display: block;
  font-size: 0.8rem;
  color: #5c6478;
  word-break: break-all;
}

.tips {
  margin-top: 2rem;
  padding: 1.25rem;
  border-radius: 12px;
  background: #fff;
  border: 1px solid #dde3f0;
}

.tips h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.tips ul {
  margin: 0;
  padding-left: 1.25rem;
}

.tips li + li {
  margin-top: 0.35rem;
}

.test-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.test-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  padding: 0.75rem 1rem;
  background: #fff;
  border-bottom: 1px solid #dde3f0;
}

.test-toolbar a {
  color: #4f6ef7;
  text-decoration: none;
  font-weight: 500;
}

.test-toolbar code {
  font-size: 0.82rem;
  color: #5c6478;
  word-break: break-all;
}

.test-toolbar button {
  margin-left: auto;
  padding: 0.45rem 0.85rem;
  border: 1px solid #dde3f0;
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  font-size: 0.85rem;
}

.test-toolbar button:hover {
  border-color: #4f6ef7;
}

.iframe-wrap {
  flex: 1;
  min-height: 0;
  background: #e8ecf5;
}

.iframe-wrap iframe {
  display: block;
  width: 100%;
  height: 100%;
  min-height: calc(100vh - 3.5rem);
  border: 0;
  background: #fff;
}