:root {
  --bg: #eeeae0;
  --paper: #faf8f2;
  --paper-shade: #f2efe6;
  --ink: #2a2622;
  --ink-soft: #58524a;
  --ink-faint: #8a8275;
  --border: #d9d2c1;
  --border-strong: #c7bea9;
  --accent: #9a3f2c;
  --accent-hover: #7c3222;
  --serif: "Source Serif 4", Georgia, "Iowan Old Style", serif;
  --sans: "Inter", "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", "Courier New", monospace;
}

* { box-sizing: border-box; }

html {
  background: var(--bg);
}

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse at top, rgba(255, 255, 255, 0.4), transparent 60%);
  color: var(--ink);
  line-height: 1.55;
}

header {
  position: relative;
  padding: 56px 24px 28px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.github-btn {
  position: absolute;
  top: 20px;
  right: 24px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  border: 1px solid var(--border-strong);
  border-radius: 2px;
  background: var(--paper);
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.78rem;
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.github-btn:hover {
  color: var(--paper);
  background: var(--ink);
  border-color: var(--ink);
}

@media (max-width: 560px) {
  .github-btn {
    position: static;
    display: inline-flex;
    margin-bottom: 16px;
  }
}

.kicker {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

header h1 {
  margin: 0 0 14px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 2.6rem;
  letter-spacing: -0.01em;
}

.subtitle {
  color: var(--ink-soft);
  margin: 0 auto;
  max-width: 560px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.05rem;
}

main {
  display: grid;
  grid-template-columns: minmax(280px, 380px) 1fr;
  gap: 28px;
  max-width: 1120px;
  margin: 40px auto;
  padding: 0 24px;
  align-items: start;
}

@media (max-width: 800px) {
  main { grid-template-columns: 1fr; }
}

.panel {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 28px 26px;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.6) inset, 0 10px 24px -18px rgba(42, 38, 34, 0.35);
}

.panel h2 {
  margin: 0 0 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: 0.01em;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 16px;
}

.field label {
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

.hint {
  color: var(--ink-faint);
  font-size: 0.78rem;
  font-style: italic;
}

input[type="number"],
input[type="text"],
select {
  background: var(--paper-shade);
  border: 1px solid var(--border-strong);
  color: var(--ink);
  padding: 9px 11px;
  border-radius: 2px;
  font-size: 0.92rem;
  font-family: var(--sans);
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

select {
  width: 100%;
}

.resolution-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.resolution-row input[type="number"] {
  flex: 1;
  min-width: 0;
}

.resolution-row span {
  color: var(--ink-faint);
}

fieldset.clues {
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 14px 16px 2px;
  margin: 0 0 16px;
}

fieldset.clues legend {
  color: var(--ink-soft);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 0 4px;
  font-family: var(--mono);
}

.reset-btn {
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--ink-soft);
  padding: 7px 14px;
  border-radius: 2px;
  font-size: 0.78rem;
  font-family: var(--sans);
  cursor: pointer;
  margin: 0 0 14px;
}

.reset-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.difficulty-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

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

.difficulty-check {
  display: flex;
  align-items: center;
  gap: 7px;
  min-width: 90px;
  font-weight: 600;
  font-family: var(--serif);
  cursor: pointer;
}

.difficulty-check input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.difficulty-inputs {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  min-width: 0;
}

.difficulty-inputs label {
  color: var(--ink-faint);
  font-size: 0.78rem;
  white-space: nowrap;
}

.difficulty-inputs input[type="number"] {
  width: 4.5em;
  min-width: 0;
}

.difficulty-inputs input:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

details.advanced {
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 4px 16px 2px;
  margin: 0 0 16px;
}

details.advanced[open] {
  padding-bottom: 14px;
}

details.advanced summary {
  cursor: pointer;
  color: var(--ink-soft);
  font-size: 0.85rem;
  font-family: var(--mono);
  letter-spacing: 0.02em;
  padding: 12px 0;
  list-style: none;
  user-select: none;
}

details.advanced summary::-webkit-details-marker {
  display: none;
}

details.advanced summary::before {
  content: "▸ ";
  display: inline-block;
  color: var(--accent);
}

details.advanced[open] summary::before {
  content: "▾ ";
}

details.advanced fieldset.clues {
  margin-top: 10px;
}

button#generateBtn {
  width: 100%;
  padding: 13px 16px;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 2px;
  font-family: var(--serif);
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

button#generateBtn:hover:not(:disabled) {
  background: var(--accent);
  border-color: var(--accent);
}

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

#progress-wrap {
  margin-top: 20px;
}

.progress-bar {
  height: 4px;
  border-radius: 0;
  background: var(--paper-shade);
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 12px;
}

#progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.2s ease;
}

#log {
  background: var(--paper-shade);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 12px;
  height: 220px;
  overflow-y: auto;
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--ink-soft);
  white-space: pre-wrap;
  margin: 0;
}

.empty-state {
  color: var(--ink-faint);
  padding: 48px 10px;
  text-align: center;
  font-family: var(--serif);
  font-style: italic;
}

.download-btn {
  display: inline-block;
  margin-bottom: 14px;
  padding: 11px 20px;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 2px;
  text-decoration: none;
  font-family: var(--serif);
  font-weight: 600;
  transition: background 0.15s ease, color 0.15s ease;
}

.download-btn:hover {
  background: var(--accent);
  color: var(--paper);
}

#previewFrame {
  width: 100%;
  height: 70vh;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: var(--paper-shade);
}

.hidden {
  display: none !important;
}

footer {
  text-align: center;
  color: var(--ink-faint);
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.88rem;
  padding: 32px 24px 48px;
  max-width: 640px;
  margin-inline: auto;
}

.repo-link {
  margin-top: 8px;
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.78rem;
}

.repo-link a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--border-strong);
  transition: color 0.15s ease, border-color 0.15s ease;
}

.repo-link a:hover {
  color: var(--accent);
  border-color: var(--accent);
}