:root {
  --bg: #0f172a;
  --panel: #111827;
  --accent: #34d399;
  --accent-strong: #10b981;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --border: #1f2937;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.35);
  --radius: 16px;
  --font: 'Noto Sans JP', 'Hiragino Sans', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background: radial-gradient(circle at 20% 20%, rgba(52, 211, 153, 0.12), transparent 25%),
              radial-gradient(circle at 80% 10%, rgba(14, 165, 233, 0.12), transparent 25%),
              var(--bg);
  padding: 32px 16px 64px;
}

.page {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.header h1 {
  margin: 6px 0 8px;
  font-size: 32px;
  letter-spacing: 0.02em;
}

.eyebrow {
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin: 0;
  font-size: 12px;
}

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

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

.ad-slot {
  background: #0b1220;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
}

.panel-head {
  margin-bottom: 12px;
}

.panel-head h2 {
  margin: 0 0 6px;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

textarea {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0b1220;
  color: var(--text);
  font-family: var(--font);
  resize: vertical;
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin: 16px 0 8px;
}

.control label {
  display: block;
  color: var(--muted);
  margin-bottom: 6px;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

input[type="range"] {
  flex: 1;
}

.value {
  min-width: 80px;
  text-align: right;
  color: var(--text);
  font-weight: 600;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}

button {
  border: none;
  border-radius: 12px;
  padding: 12px 16px;
  font-weight: 700;
  cursor: pointer;
  color: var(--text);
  transition: transform 0.1s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #0b1220;
  box-shadow: 0 12px 30px rgba(52, 211, 153, 0.35);
}

.primary:active {
  transform: translateY(1px);
}

.ghost {
  background: transparent;
  border: 1px solid var(--border);
}

.status {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 640px) {
  .header {
    flex-direction: column;
    align-items: flex-start;
  }
  .header h1 {
    font-size: 28px;
  }
  body {
    padding: 20px 12px 48px;
  }
  .actions {
    flex-direction: column;
    align-items: flex-start;
  }
}