:root {
  --bg-page: #f5f5f3;
  --bg-card: #ffffff;
  --border-color: #e0ded8;
  --text-primary: #1f1e1c;
  --text-secondary: #6b6a66;
  --accent: #2f6f4f;
  --accent-soft: #e5f1ea;
  --warn: #b5740b;
  --warn-soft: #fbf0dc;
  --danger: #b3392f;
  --danger-soft: #fbe7e4;
  --radius-md: 8px;
  --radius-lg: 12px;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body.dark {
  --bg-page: #15161a;
  --bg-card: #1f2025;
  --border-color: #33343a;
  --text-primary: #ececec;
  --text-secondary: #9a9a9d;
  --accent: #4caf7d;
  --accent-soft: #1d2e25;
  --warn: #e0a93f;
  --warn-soft: #332a14;
  --danger: #e36a5e;
  --danger-soft: #34201d;
}

body.dark .snippet-title { color: #8ab4f8; }
body.dark .snippet-url { color: #6fcf97; }
body.dark .btn,
body.dark .theme-toggle,
body.dark .ed-btn,
body.dark .tab-btn:not(.active) { color: var(--text-primary); }
body.dark .tab-btn.active { color: var(--accent); }

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.5;
}

.app-header {
  padding: 24px 24px 8px;
  max-width: 1100px;
  margin: 0 auto;
}
.app-header h1 { margin: 0 0 4px; font-size: 24px; font-weight: 600; }
.subtitle { margin: 0; color: var(--text-secondary); font-size: 14px; }

.intro-banner {
  max-width: 1100px;
  margin: 16px auto 0;
  padding: 0 24px;
}
.intro-banner p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
  background: var(--accent-soft);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}
.intro-banner strong { color: var(--text-primary); }

.tabs {
  max-width: 1100px;
  margin: 16px auto 0;
  padding: 0 24px;
  display: flex;
  gap: 8px;
}
.tab-btn {
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
}
.tab-btn.active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.layout {
  max-width: 1100px;
  margin: 16px auto 40px;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 16px;
}
.card label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0 0 6px;
}
.card label:not(:first-child) { margin-top: 12px; }

input[type="text"], textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-family: inherit;
  background: var(--bg-page);
  color: var(--text-primary);
}
input[type="text"]:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.content-card textarea {
  min-height: 280px;
  resize: vertical;
}

.editor-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
  margin-bottom: 8px;
  padding: 6px;
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}
.ed-btn {
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-primary);
  border-radius: 6px;
  padding: 5px 9px;
  font-size: 12px;
  cursor: pointer;
}
.ed-btn:hover {
  background: var(--bg-card);
  border-color: var(--border-color);
}
.ed-sep {
  width: 1px;
  height: 20px;
  background: var(--border-color);
  margin: 0 4px;
}

.editable-content {
  min-height: 280px;
  max-height: 600px;
  overflow-y: auto;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-page);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.6;
}
.editable-content:focus {
  outline: none;
  border-color: var(--accent);
}
.editable-content:empty:before {
  content: attr(data-placeholder);
  color: var(--text-secondary);
}
.editable-content h1 { font-size: 22px; margin: 0.6em 0 0.3em; }
.editable-content h2 { font-size: 19px; margin: 0.6em 0 0.3em; }
.editable-content h3 { font-size: 16px; margin: 0.6em 0 0.3em; }
.editable-content h4 { font-size: 14px; margin: 0.6em 0 0.3em; }
.editable-content p { margin: 0 0 0.6em; }
.editable-content ul, .editable-content ol { margin: 0 0 0.6em; padding-left: 1.4em; }
.editable-content a { color: var(--accent); text-decoration: underline; }
.editable-content table { border-collapse: collapse; margin-bottom: 0.6em; }
.editable-content table td, .editable-content table th {
  border: 1px solid var(--border-color);
  padding: 4px 8px;
  font-size: 13px;
}

.snippet-preview { background: var(--bg-page); }
.snippet-label { font-size: 12px; color: var(--text-secondary); margin: 0 0 6px; }
.snippet-title { font-size: 16px; color: #1a0dab; margin: 0 0 2px; }
.snippet-url { font-size: 12px; color: #006621; margin: 0 0 4px; }
.snippet-desc { font-size: 13px; color: var(--text-secondary); margin: 0; }

.actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.btn {
  padding: 8px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 13px;
}
.btn:hover { background: var(--bg-page); }
.save-status { font-size: 12px; color: var(--text-secondary); }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.placeholder {
  color: var(--text-secondary);
  font-size: 14px;
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
}

.footer {
  margin-top: 40px;
  padding: 40px 24px 28px;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  text-align: center;
}
.footer .container {
  max-width: 700px;
  margin: 0 auto;
}
.footer h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}
.footer-description {
  margin: 0 0 18px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px;
  margin-bottom: 24px;
}
.footer-links a {
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
}
.footer-links a:hover {
  text-decoration: underline;
}
.developer-credit h5 {
  margin: 0 0 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}
.developer-credit p {
  margin: 0;
  font-size: 12px;
  color: var(--text-secondary);
}
.developer-credit .powered {
  margin-top: 4px;
  font-style: italic;
}
.footer hr {
  margin: 20px auto;
  max-width: 320px;
  border: none;
  border-top: 1px solid var(--border-color);
}
.copyright-text {
  margin: 0;
  font-size: 11px;
  color: var(--text-secondary);
}

body { transition: background 0.2s ease, color 0.2s ease; }
.card, .tab-btn, input[type="text"], textarea, .score-card, .stat-strip { transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease; }

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 24px 0;
}
.theme-toggle {
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
}
.theme-toggle:hover { background: var(--bg-page); }

@media (max-width: 800px) {
  .tabs { flex-wrap: wrap; }
  .score-grid { grid-template-columns: 1fr; }
  .stat-strip { flex-direction: column; gap: 10px; }
  .stat-strip div { text-align: left; }
  .header-row { flex-direction: column; gap: 8px; }
}
.score-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}
.score-card {
  background: var(--bg-page);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}
.score-card .score-label { font-size: 13px; color: var(--text-secondary); margin: 0 0 4px; }
.score-card .score-value { font-size: 22px; font-weight: 600; margin: 0; }
.score-good { color: var(--accent); }
.score-ok { color: var(--warn); }
.score-bad { color: var(--danger); }

.check-row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 13px;
}
.check-row:last-child { border-bottom: none; }
.check-icon { font-size: 16px; line-height: 1.4; flex-shrink: 0; }
.check-good .check-icon { color: var(--accent); }
.check-ok .check-icon { color: var(--warn); }
.check-bad .check-icon { color: var(--danger); }

.stat-strip {
  display: flex;
  justify-content: space-between;
  background: var(--bg-page);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-top: 12px;
}
.stat-strip div { text-align: center; }
.stat-strip .stat-label { font-size: 12px; color: var(--text-secondary); margin: 0; }
.stat-strip .stat-value { font-size: 16px; font-weight: 600; margin: 2px 0 0; }