:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1e222b;
  --fg: #e6e8ec;
  --muted: #8a93a6;
  --accent: #c5a3ff;
  --border: #272b35;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

header {
  padding: 24px 32px 8px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}
header h1 { margin: 0; font-size: 22px; }
header #subtitle {
  grid-column: 1 / 2;
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.lang-switch {
  grid-column: 2 / 3;
  grid-row: 1 / 3;
  display: flex;
  align-items: center;
  gap: 6px;
}

main {
  padding: 24px 32px 48px;
  max-width: 1000px;
  margin: 0 auto;
}

.preview {
  height: 260px;
  border-radius: 14px;
  border: 1px solid var(--border);
  margin-bottom: 22px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.4);
}

section { margin-bottom: 20px; }

.controls {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
}

.row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.field { flex: 1; min-width: 150px; }

label, h2 {
  display: block;
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  margin: 0 0 6px;
}

select, input[type="range"], input[type="number"] {
  width: 100%;
  padding: 8px 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  font-size: 14px;
  font-family: inherit;
}
input[type="range"] { padding: 0; accent-color: var(--accent); }

select:focus, input:focus { outline: none; border-color: var(--accent); }

.stops-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  margin-bottom: 8px;
}
.stops-header h2 { margin: 0; }

#add-stop-btn {
  padding: 5px 12px;
  background: var(--accent);
  color: #0b1320;
  border: none;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
}

.stops {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stop-row {
  display: grid;
  grid-template-columns: 44px 1fr 50px 32px;
  gap: 10px;
  align-items: center;
  padding: 8px 12px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.stop-row input[type="color"] {
  width: 44px;
  height: 30px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
}
.pos-label {
  color: var(--muted);
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  text-align: right;
}

.remove-btn {
  padding: 4px 8px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  font-family: inherit;
}
.remove-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.remove-btn:hover:not(:disabled) { color: #ff6b6b; border-color: #ff6b6b; }

.output-section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
}
.output-header > span {
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}
#copy-btn {
  padding: 4px 12px;
  background: var(--accent);
  color: #0b1320;
  border: none;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  text-transform: uppercase;
}
#output {
  margin: 0;
  padding: 16px 20px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  color: var(--accent);
  white-space: pre-wrap;
  word-break: break-all;
}

.presets-section { }
.presets {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 10px;
}
.preset-btn {
  aspect-ratio: 3 / 2;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.1s ease;
}
.preset-btn:hover {
  transform: scale(1.05);
  border-color: var(--accent);
}

select {
  padding: 8px 10px;
}

footer {
  padding: 24px 32px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}