:root {
  --bg: #0e0f14;
  --panel: #161821;
  --panel-2: #1d2030;
  --border: #2a2d3d;
  --text: #e6e7ee;
  --muted: #9ea0b5;
  --accent: #7aa7ff;
  --accent-strong: #4f86ff;
  --ok: #7ad3a2;
  --warn: #ffb85c;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", sans-serif;
}

a { color: var(--accent); }
code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--panel-2);
  padding: 1px 5px;
  border-radius: 4px;
}

.hero {
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 24px 24px;
  text-align: center;
}
.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: -0.02em;
}
.hero .tagline {
  max-width: 640px;
  margin: 0 auto;
  color: var(--muted);
}
.hero .sub {
  margin-top: 14px;
  font-family: var(--mono);
  color: var(--accent);
  font-size: 13px;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 24px 40px;
}

fieldset {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px 22px;
  margin: 0 0 20px;
}
legend {
  padding: 0 8px;
  color: var(--text);
  font-weight: 600;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-strong);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}

label {
  display: block;
  margin: 12px 0;
}
label > small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-top: 4px;
}

input[type=text], textarea {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 9px 11px;
  font: inherit;
  font-family: inherit;
  margin-top: 6px;
}
input[type=text]:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 134, 255, 0.15);
}

textarea { resize: vertical; }

label.radio, label.check {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel-2);
  margin: 8px 0;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
label.radio:hover, label.check:hover {
  border-color: var(--accent);
}
label.radio input, label.check input {
  margin-top: 3px;
  flex-shrink: 0;
}
label.radio span, label.check span {
  line-height: 1.45;
  color: var(--muted);
}
label.radio span strong, label.check span strong {
  color: var(--text);
}
label.radio input:disabled + span, label.check input:disabled + span {
  opacity: 0.65;
}

.hint {
  color: var(--muted);
  font-size: 13px;
  margin: 0 0 10px;
}
.hint.note {
  padding: 10px 12px;
  background: var(--panel-2);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  margin-bottom: 12px;
}
.hint.note a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
.hint.note a:hover { text-decoration: underline; }

.preset-panel {
  padding: 10px 12px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 14px;
}
.preset-label {
  display: block;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.preset-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 14px;
  align-items: center;
}
.preset-grid > * {
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
}
.preset-grid > *:nth-last-child(-n+2) {
  border-bottom: none;
  padding-bottom: 2px;
}
.preset-desc {
  color: var(--muted);
  font-size: 12px;
}
.preset-btn {
  padding: 5px 12px;
  font-size: 13px;
  border-radius: 5px;
  white-space: nowrap;
}

.preview-wrap {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 14px;
  margin-top: 8px;
  min-height: 320px;
}
@media (max-width: 720px) {
  .preview-wrap { grid-template-columns: 1fr; }
}
.tree {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 12px;
  overflow: auto;
  max-height: 420px;
}
.tree ul {
  list-style: none;
  padding-left: 14px;
  margin: 0;
}
.tree > ul { padding-left: 0; }
.tree li {
  padding: 2px 4px;
  border-radius: 3px;
  cursor: pointer;
  color: var(--muted);
  white-space: nowrap;
}
.tree li.dir { color: var(--text); cursor: default; }
.tree li.file:hover { background: var(--border); color: var(--text); }
.tree li.file.active { background: var(--accent-strong); color: #fff; }

.file-view {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 320px;
}
.file-tabs {
  border-bottom: 1px solid var(--border);
  padding: 8px 12px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}
.file-body {
  margin: 0;
  padding: 14px 16px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--text);
  max-height: 420px;
  white-space: pre;
}

.actions {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 18px;
  flex-wrap: wrap;
}
button {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 16px;
  font: inherit;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
button:hover { border-color: var(--accent); }
button.primary {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: #fff;
  font-weight: 600;
}
button.primary:hover { background: var(--accent); border-color: var(--accent); }

.status {
  color: var(--ok);
  font-size: 13px;
  font-family: var(--mono);
}
.status.error { color: var(--warn); }

.usage {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
  margin-top: 8px;
}
.usage h2 {
  margin: 0 0 8px;
  font-size: 16px;
}
.usage ol {
  padding-left: 22px;
  margin: 10px 0;
}
.usage li {
  margin: 6px 0;
  color: var(--muted);
}
.usage li code { color: var(--text); }
.usage p { color: var(--muted); margin: 10px 0 0; }

footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 20px 24px 40px;
}