:root {
  --bg: #f7f7f8;
  --surface: #ffffff;
  --border: #e2e2e6;
  --text: #1d1d1f;
  --text-muted: #6e6e76;
  --accent: #2f3742;
  --accent-hover: #1d222a;
  --danger: #b3261e;
  --danger-bg: #fdecea;
  --code-bg: #f2f2f4;
  --radius: 10px;
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.5;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

header.page-header {
  margin-bottom: 2.5rem;
}

header.page-header h1 {
  font-size: 2rem;
  margin: 0 0 0.35rem;
  letter-spacing: -0.02em;
}

header.page-header p {
  margin: 0;
  color: var(--text-muted);
  font-size: 1.05rem;
}

section {
  margin-bottom: 3rem;
}

section > h2 {
  font-size: 1.35rem;
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 1.25rem;
}

.form-grid .field-full {
  grid-column: 1 / -1;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--text-muted);
}

input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
}

textarea {
  resize: vertical;
  min-height: 4.5rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9rem;
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

button {
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
}

button.primary {
  background: var(--accent);
  color: #fff;
}

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

button.secondary {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
  font-weight: 500;
  font-size: 0.85rem;
  padding: 0.35rem 0.7rem;
}

button.secondary:hover {
  background: var(--code-bg);
}

.form-actions {
  margin-top: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.error-box {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 6px;
  background: var(--danger-bg);
  color: var(--danger);
  font-size: 0.9rem;
}

.error-box[hidden] {
  display: none;
}

.result-panel {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  align-items: start;
}

.result-panel[hidden] {
  display: none;
}

.qr-preview {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  width: 240px;
  height: 240px;
  box-sizing: border-box;
  align-self: start;
}

.qr-preview svg {
  display: block;
  width: 100%;
  height: 100%;
}

.result-meta dl {
  margin: 0 0 1rem;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 0.75rem;
  font-size: 0.9rem;
}

.result-meta dt {
  color: var(--text-muted);
  font-weight: 600;
}

.result-meta dd {
  margin: 0;
}

.download-links {
  display: flex;
  gap: 0.75rem;
}

.download-links a {
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
  border: 1px solid var(--border);
  padding: 0.35rem 0.7rem;
  border-radius: 6px;
}

.download-links a:hover {
  background: var(--code-bg);
}

.curl-block {
  margin-top: 1.75rem;
}

.curl-block h3 {
  font-size: 0.95rem;
  margin: 0 0 0.5rem;
}

.curl-wrap {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.curl-wrap pre {
  flex: 1;
  min-width: 0;
  margin: 0;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 0;
}

.curl-wrap button.secondary {
  flex: none;
  margin-top: 0.5rem;
}

table.api-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin-bottom: 1.5rem;
}

table.api-table th,
table.api-table td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

table.api-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

table.api-table code {
  font-size: 0.85em;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--code-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
}

pre code {
  background: none;
  padding: 0;
}

.examples h3 {
  font-size: 0.95rem;
  margin: 1.25rem 0 0.5rem;
}

.examples h3:first-child {
  margin-top: 0;
}

.section-intro {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.load-test-controls {
  display: flex;
  align-items: flex-end;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.load-test-controls > div {
  min-width: 140px;
}

.load-test-controls input[type="number"],
.load-test-controls select {
  width: auto;
  min-width: 100px;
}

.load-test-buttons {
  display: flex;
  gap: 0.75rem;
  min-width: auto;
}

.load-test-buttons button {
  margin-bottom: 0;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.stat-grid {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 0.75rem;
}

.stat-grid[hidden] {
  display: none;
}

.stat-tile {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.stat-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-muted);
}

.stat-value {
  font-size: 1.05rem;
  font-weight: 700;
}

.stat-caption {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 400;
  text-transform: none;
  letter-spacing: normal;
}

.load-test-results {
  margin-top: 1.25rem;
  max-height: 360px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.load-test-results[hidden] {
  display: none;
}

.lt-row {
  display: grid;
  grid-template-columns: 2.5rem 1fr auto auto;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0.75rem;
  font-size: 0.82rem;
  border-bottom: 1px solid var(--border);
}

.lt-row:last-child {
  border-bottom: none;
}

.lt-row-index {
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.lt-bar-track {
  display: block;
  background: var(--border);
  border-radius: 3px;
  height: 0.6rem;
  overflow: hidden;
}

.lt-bar-fill {
  display: block;
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
}

.lt-row.lt-error .lt-bar-fill {
  background: var(--danger);
}

.lt-row-ms {
  font-variant-numeric: tabular-nums;
  text-align: right;
  min-width: 4.5rem;
}

.lt-row-server {
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  min-width: 4rem;
  text-align: right;
}

.lt-row.lt-error .lt-row-ms {
  color: var(--danger);
}

.section-note {
  margin-top: 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.section-note[hidden] {
  display: none;
}

@media (max-width: 640px) {
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.docs-link {
  margin-top: 1.25rem;
  font-size: 0.9rem;
}

footer {
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  padding-top: 1.25rem;
}

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
  .result-panel {
    grid-template-columns: 1fr;
  }
  .qr-preview {
    justify-self: start;
  }
}