*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-2: #22263a;
  --border: #2e3250;
  --accent: #6c63ff;
  --accent-hover: #857dff;
  --accent-success: #22c55e;
  --text: #e2e4f0;
  --text-muted: #7a7f9a;
  --label-bg: #1e2136;
  --radius: 10px;
  --font: "Inter", system-ui, sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2.5rem 1rem 4rem;
}

/* ── Header ────────────────────────────────────────── */
header {
  text-align: center;
  margin-bottom: 2.5rem;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #6c63ff 0%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header p {
  color: var(--text-muted);
  margin-top: 0.4rem;
  font-size: 0.95rem;
}

/* ── Card ───────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  width: 100%;
  max-width: 680px;
}

/* ── Form ───────────────────────────────────────────── */
.form-section {
  margin-bottom: 1.5rem;
}

.form-section__title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
  margin-bottom: 0.9rem;
}

.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.input-group label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.input-group input[type="number"] {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  font-size: 0.95rem;
  padding: 0.55rem 0.75rem;
  width: 100%;
  transition: border-color 0.2s;
  outline: none;
  -moz-appearance: textfield;
}

.input-group input[type="number"]::-webkit-inner-spin-button,
.input-group input[type="number"]::-webkit-outer-spin-button { opacity: 0.4; }

.input-group input[type="number"]:focus {
  border-color: var(--accent);
}

/* ── Checkboxes ─────────────────────────────────────── */
.checkbox-row {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  cursor: pointer;
  font-size: 0.9rem;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-radius: 5px;
  background: var(--surface-2);
  flex-shrink: 0;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  position: relative;
}

.checkbox-label input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}

.checkbox-label input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 1px;
  width: 6px;
  height: 10px;
  border: 2px solid #fff;
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
}

.checkbox-label .tag {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.73rem;
  padding: 1px 6px;
  color: var(--text-muted);
  font-family: monospace;
}

/* ── Divider ────────────────────────────────────────── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

/* ── Buttons ────────────────────────────────────────── */
.btn-row {
  display: flex;
  gap: 0.75rem;
}

.btn {
  flex: 1;
  padding: 0.65rem 1.25rem;
  border: none;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s, transform 0.1s, color 0.18s;
}

.btn:active { transform: scale(0.97); }

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

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

.btn--secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn--secondary:hover { background: var(--border); }

.btn--success {
  background: var(--accent-success) !important;
  color: #fff;
}

/* ── Output area ────────────────────────────────────── */
#output {
  margin-top: 2rem;
  width: 100%;
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.output-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--accent);
  padding: 0.9rem 0 0.2rem;
  border-top: 1px solid var(--border);
}

.output-label:first-child { border-top: none; }

.output-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text);
  word-break: break-word;
}

.output-block--html-preview p,
.output-block--html-preview ul {
  margin: 0;
  padding: 0;
}

.output-block--html-preview li {
  margin-left: 1.2rem;
}

.output-error {
  color: #f87171;
  background: #2a1a1a;
  border: 1px solid #7f1d1d;
  border-radius: 8px;
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
}

/* ── Responsive ─────────────────────────────────────── */
@media (max-width: 500px) {
  .input-row { grid-template-columns: 1fr; }
  .btn-row { flex-direction: column; }
  header h1 { font-size: 1.5rem; }
}