:root {
  --bg: #121212;
  --fg: #e8eaed;
  --muted: #9aa0a6;
  --accent: #3d85c6;
  --card: #1e1f21;
  --border: #2a2b2e;
}

html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

/* Container spacing for desktop & mobile */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
}

/* Text input area spacing */
textarea, .editor, .input-area {
  width: 100%;
  box-sizing: border-box;
  padding: 14px 16px;
  border: 1px solid #ddd;
  border-radius: 10px;
  background: #fafafa;
  color: #000;
}

/* Ensure not edge-to-edge on small screens */
.section,
.controls,
.panel {
  margin: 12px 0;
}

/* Buttons: comfortable hit area for touch + desktop */
.btn, button, .primary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px; /* touch-friendly */
  min-height: 40px;
  border-radius: 10px;
  border: 1px solid #1f6feb;
  background: #2f81f7;
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}

.btn:hover, button:hover, .primary-button:hover {
  background: #1f6feb;
  border-color: #1f6feb;
}

.btn:active, button:active, .primary-button:active {
  background: #1655c9;
  border-color: #1655c9;
}

.btn:disabled, button:disabled, .primary-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Secondary button variant */
.btn-secondary {
  background: #f6f8fa;
  color: #0a0a0a;
  border-color: #d0d7de;
}

.btn-secondary:hover {
  background: #eef2f6;
}

/* Version indicator */
footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 8px;
}

.version {
  font-size: 0.75rem;
  color: var(--muted);
  font-family: 'Courier New', monospace;
  padding: 2px 6px;
  background: var(--card);
  border-radius: 4px;
  border: 1px solid var(--border);
}

.version.version-live {
  color: #9be9a8;
  border-color: #2f6b3d;
}

.version.version-update {
  color: #ffd28f;
  border-color: #8b5e1a;
}

.version.version-no-sw {
  color: #ffb3b3;
  border-color: #8b3a3a;
}

/* Responsive tweaks */
@media (max-width: 600px) {
  .container {
    padding: 12px;
  }
  .btn, button, .primary-button {
    width: 100%; /* stack and full-width for mobile */
  }
}

header, footer { padding: 16px 20px; }
header h1 { margin: 0 0 4px; font-size: 20px; }
.subtitle { color: var(--muted); margin: 0; }

main { padding: 16px 20px; display: grid; gap: 16px; }

label { display: block; margin-bottom: 6px; color: var(--fg); }
textarea {
  width: 100%;
  min-height: 220px;
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  resize: vertical;
}

.toggles { margin-top: 8px; }
.toggle { display: flex; align-items: center; gap: 8px; color: var(--fg); }

.actions { display: flex; gap: 8px; align-items: center; margin-top: 12px; }
button {
  appearance: none;
  background: var(--accent);
  color: white;
  border: none;
  padding: 10px 14px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  transition: opacity 0.2s;
}
button:disabled { opacity: 0.6; cursor: not-allowed; }
button.loading {
  padding-left: 36px;
}
button.loading::before {
  content: '';
  position: absolute;
  left: 10px;
  top: 50%;
  width: 16px;
  height: 16px;
  margin-top: -8px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

input[type="file"] { color: var(--muted); }

#results h2 { margin: 0; font-size: 16px; color: var(--muted); }
.card {
  margin-top: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}
.hidden { display: none; }
.summary-row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.summary-row code { background: #2b2c2f; padding: 2px 6px; border-radius: 6px; }
.summary-actions { display: flex; gap: 8px; margin-top: 8px; }

.link-btn {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

/* Download section */
#downloadSection { margin-top: 16px; }
.download-card {
  background: var(--card);
  border: 2px solid var(--accent);
  border-radius: 10px;
  padding: 20px;
  text-align: center;
}
.download-card a {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
}
.download-card a:hover {
  opacity: 0.9;
}
.download-info {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

/* Accordion sections */
.accordion {
  margin-top: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.accordion summary {
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 600;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.accordion summary::-webkit-details-marker {
  display: none;
}
.accordion summary::after {
  content: '▼';
  font-size: 12px;
  transition: transform 0.2s;
}
.accordion[open] summary::after {
  transform: rotate(-180deg);
}
.accordion-content {
  padding: 0 16px 16px;
  max-height: 400px;
  overflow-y: auto;
}
.accordion-content .mermaid {
  margin: 16px 0;
  padding: 8px;
  background: white;
  border-radius: 4px;
}
.accordion-content pre {
  background: #2b2c2f;
  padding: 12px;
  border-radius: 6px;
  overflow-x: auto;
}
.accordion-content code {
  background: #2b2c2f;
  padding: 2px 4px;
  border-radius: 4px;
}

#preview { margin-top: 16px; }
#previewContent { max-height: 400px; overflow-y: auto; }
#previewContent .mermaid { margin: 16px 0; padding: 8px; background: white; border-radius: 4px; }
#previewContent pre { background: #2b2c2f; padding: 12px; border-radius: 6px; overflow-x: auto; }
#previewContent code { background: #2b2c2f; padding: 2px 4px; border-radius: 4px; }


/* Mode switch */
.mode-row { display: flex; flex-direction: column; gap: 6px; margin-bottom: 8px; }
.mode-switch { display: inline-flex; gap: 8px; flex-wrap: wrap; }
.mode-chip { background: var(--card); border: 1px solid var(--border); padding: 8px 12px; border-radius: 8px; display: inline-flex; align-items: center; gap: 8px; cursor: pointer; }
.mode-chip input { accent-color: var(--accent); }
.mode-chip span { color: var(--fg); font-weight: 600; }

/* PNG options */
.png-options { margin-top: 8px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: rgba(255,255,255,0.03); }
.inline-input { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.inline-input input { width: 160px; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--border); background: #0f0f10; color: var(--fg); }
.muted-text { color: var(--muted); font-size: 0.9rem; }