:root {
  --bg: #0b1020;
  --card: #121a33;
  --text: #e9ecf5;
  --muted: #aab3cf;
  --border: rgba(255, 255, 255, 0.10);
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.35);
  --primary: #6ea8ff;
  --primary2: #3b82f6;
  --danger: #ff6b6b;
  --ok: #34d399;
}

* { box-sizing: border-box; }

[hidden] {
  display: none !important;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  background: radial-gradient(1200px 800px at 20% 0%, rgba(110,168,255,0.18), transparent 60%),
              radial-gradient(900px 700px at 90% 10%, rgba(52,211,153,0.12), transparent 55%),
              var(--bg);
  color: var(--text);
  font-family: Aptos, system-ui, -apple-system, Arial, sans-serif;
}

.app {
  width: min(1100px, calc(100% - 32px));
  margin: 24px auto 40px;
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 16px;
}

.header {
  grid-column: 1 / -1;
  padding: 10px 2px;
}

h1 {
  font-size: 22px;
  margin: 0 0 6px;
  letter-spacing: 0.2px;
}

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

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 14px;
}

.form {
  display: grid;
  gap: 12px;
}

.field {
  display: grid;
  gap: 6px;
}

label {
  color: var(--muted);
  font-size: 13px;
}

.hint {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

input {
  width: 100%;
  background: rgba(0,0,0,0.25);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
}

select {
  width: 100%;
  background: rgba(0,0,0,0.25);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
}

input:focus {
  border-color: rgba(110,168,255,0.55);
  box-shadow: 0 0 0 4px rgba(110,168,255,0.12);
}

select:focus {
  border-color: rgba(110,168,255,0.55);
  box-shadow: 0 0 0 4px rgba(110,168,255,0.12);
}

.checkboxGroup {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.checkboxItem {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(0,0,0,0.18);
  color: var(--text);
  font-size: 14px;
  user-select: none;
}

.checkboxItem input {
  width: 16px;
  height: 16px;
}

.srOnly {
  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: 560px) {
  .checkboxGroup {
    grid-template-columns: 1fr;
  }
}

.actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 4px;
}

button {
  font-family: Aptos, system-ui, -apple-system, Arial, sans-serif;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  cursor: pointer;
  font-weight: 600;
}

button.primary {
  color: #081025;
  background: linear-gradient(180deg, var(--primary), var(--primary2));
  border-color: rgba(110,168,255,0.45);
}

button.secondary {
  color: var(--text);
  background: rgba(255,255,255,0.06);
}

button:active {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.status {
  min-height: 18px;
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.help summary, .code summary {
  cursor: pointer;
  color: var(--text);
}

.help ul {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.45;
}

.previewHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

h2 {
  font-size: 16px;
  margin: 0;
}

.pill {
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(255,255,255,0.04);
}

.previewWrap {
  background: rgba(0,0,0,0.22);
  border: 1px dashed rgba(255,255,255,0.18);
  border-radius: 12px;
  padding: 12px;
}

.preview {
  background: #ffffff;
  color: #111827;
  border-radius: 10px;
  padding: 14px;
  overflow: auto;
}

.previewPlaceholder {
  color: rgba(255, 255, 255, 0.78);
  font-size: 13px;
  line-height: 1.4;
  padding: 10px 2px;
}

.codeBlock {
  margin: 10px 0 0;
  padding: 12px;
  border-radius: 10px;
  background: rgba(0,0,0,0.35);
  border: 1px solid var(--border);
  overflow: auto;
  max-height: 240px;
}

code {
  color: #d7def6;
  font-size: 12px;
  line-height: 1.45;
}

.footer {
  grid-column: 1 / -1;
  padding: 6px 4px;
}

.muted {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.copySource {
  position: fixed;
  left: -10000px;
  top: 0;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

@media (max-width: 980px) {
  .app {
    grid-template-columns: 1fr;
  }
}