/* Star-Scar Base Styles */
:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --max-w: 800px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', 'Noto Sans SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-header h1 {
  font-size: 1.25rem;
  font-weight: 600;
}

.lang-switcher {
  display: flex;
  gap: 4px;
}

.lang-switcher button {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: all 0.15s;
}

.lang-switcher button.active,
.lang-switcher button:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Main content */
.main {
  flex: 1;
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
  padding: 24px 20px;
}

/* Tool area */
.tool-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}

.tool-card h2 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--text);
}

textarea, input[type="text"], input[type="number"] {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.9rem;
  resize: vertical;
  transition: border-color 0.15s;
}

textarea:focus, input:focus {
  outline: none;
  border-color: var(--primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s;
}

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

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

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

.btn-row {
  display: flex;
  gap: 8px;
  margin: 12px 0;
  flex-wrap: wrap;
}

/* Output area */
.output {
  background: #f1f5f9;
  border-radius: var(--radius);
  padding: 16px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.85rem;
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 60px;
  overflow-x: auto;
}

/* Ad placeholders */
.ad-slot {
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  margin: 20px 0;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Footer */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 16px 20px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.site-footer a {
  color: var(--primary);
  text-decoration: none;
}

/* SEO content block */
.seo-content {
  margin-top: 32px;
  padding: 24px;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.seo-content h2 {
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.seo-content p, .seo-content li {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

/* Responsive */
@media (max-width: 600px) {
  .main { padding: 16px 12px; }
  .tool-card { padding: 16px; }
  .btn-row { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}