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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f5f5f0;
  color: #1a1a1a;
  min-height: 100vh;
}

header {
  background: #1a1a1a;
  color: #fff;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 100;
}
header h1 { font-size: 18px; font-weight: 500; }
header span { font-size: 13px; color: #888; margin-left: auto; }

.container { max-width: 960px; margin: 0 auto; padding: 1.5rem; }

.search-bar {
  width: 100%; padding: 12px 16px; font-size: 15px;
  border: 1px solid #ddd; border-radius: 10px;
  background: #fff; color: #1a1a1a;
  margin-bottom: 1.25rem; outline: none;
}
.search-bar:focus { border-color: #555; }

.tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 1.5rem; }
.tab {
  padding: 7px 15px; font-size: 13px;
  border: 1px solid #ddd; border-radius: 20px;
  cursor: pointer; background: #fff; color: #555; transition: all 0.15s;
}
.tab:hover { border-color: #999; color: #1a1a1a; }
.tab.active { background: #1a1a1a; color: #fff; border-color: #1a1a1a; }

.section { margin-bottom: 2rem; }
.section-title {
  font-size: 20px; font-weight: 600; color: #1a1a1a;
  margin-bottom: 1rem; padding-bottom: 8px;
  border-bottom: 2px solid #1a1a1a;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(420px, 1fr));
  gap: 12px;
}

.card {
  background: #fff; border: 1px solid #e8e8e8;
  border-radius: 12px; padding: 1rem 1.25rem;
}
.card-title { font-size: 15px; font-weight: 600; color: #1a1a1a; margin-bottom: 6px; }
.card-desc { font-size: 14px; color: #666; margin-bottom: 10px; line-height: 1.7; }

/* code preview */
pre {
  background: #1a1a1a; color: #e8e8e8;
  border-radius: 8px 8px 0 0;
  padding: 12px 14px; font-size: 12.5px;
  overflow-x: auto; line-height: 1.65;
  font-family: 'Fira Code','Cascadia Code','Consolas',monospace;
  white-space: pre; margin: 0;
}

/* toolbar */
.editor-toolbar {
  display: flex; align-items: center; gap: 6px;
  background: #111; padding: 6px 10px;
  border-top: 1px solid #2a2a2a;
}

.btn-run {
  padding: 4px 14px; font-size: 12px; font-weight: 600;
  background: #22c55e; color: #fff;
  border: none; border-radius: 6px;
  cursor: pointer; transition: background 0.15s;
}
.btn-run:hover { background: #16a34a; }

.btn-reset {
  padding: 4px 10px; font-size: 12px;
  background: transparent; color: #888;
  border: 1px solid #333; border-radius: 6px;
  cursor: pointer; transition: all 0.15s;
}
.btn-reset:hover { color: #ccc; border-color: #555; }

.toolbar-hint { font-size: 11px; color: #555; margin-left: auto; }

/* editable textarea */
.code-editor {
  width: 100%;
  background: #1a1a1a; color: #e8e8e8;
  font-family: 'Fira Code','Cascadia Code','Consolas',monospace;
  font-size: 14px; line-height: 1.65;
  border: none; outline: none;
  resize: vertical; padding: 12px 14px;
  min-height: 80px; tab-size: 2;
  display: none;
}

.card.editing pre { display: none; }
.card.editing .code-editor { display: block; }

/* console output */
.console-output {
  background: #0d0d0d;
  border-radius: 0 0 8px 8px;
  padding: 0; max-height: 0; overflow: hidden;
  transition: max-height 0.2s ease, padding 0.2s ease;
  font-family: 'Fira Code','Cascadia Code','Consolas',monospace;
  font-size: 12px;
  border-top: 1px solid #222;
}
.console-output.has-output {
  max-height: 300px; padding: 10px 14px; overflow-y: auto;
}

.console-line { line-height: 1.7; padding: 1px 0; white-space: pre-wrap; word-break: break-all; }
.console-line.log   { color: #e8e8e8; }
.console-line.warn  { color: #fbbf24; }
.console-line.error { color: #f87171; }
.console-line.info  { color: #60a5fa; }
.console-line.result { color: #a78bfa; }
.console-line.divider {
  color: #444; border-top: 1px solid #222;
  margin-top: 6px; padding-top: 6px; font-size: 11px;
}

.empty { text-align: center; color: #999; padding: 3rem 0; font-size: 15px; }

@media (max-width: 600px) {
  .cards-grid { grid-template-columns: 1fr; }
  header h1 { font-size: 16px; }
}

@media (prefers-color-scheme: dark) {
  body { background: #111; color: #e8e8e8; }
  header { background: #000; }
  .search-bar { background: #1e1e1e; border-color: #333; color: #e8e8e8; }
  .search-bar:focus { border-color: #666; }
  .tab { background: #1e1e1e; border-color: #333; color: #aaa; }
  .tab:hover { border-color: #666; color: #e8e8e8; }
  .tab.active { background: #e8e8e8; color: #111; border-color: #e8e8e8; }
  .section-title { color: #e8e8e8; border-color: #444; }
  .card { background: #1e1e1e; border-color: #2a2a2a; }
  .card-title { color: #e8e8e8; }
  .card-desc { color: #aaa; }
  .btn-reset { border-color: #444; }
  .empty { color: #666; }
}

/* ── Порівняння методів ── */
.compare-block {
  margin-top: 2rem;
  border-top: 1px solid #e8e8e8;
  padding-top: 1.5rem;
}

.compare-title {
  font-size: 17px;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 1rem;
}

.compare-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  margin-bottom: 1rem;
}

.compare-card {
  background: #f8f8f5;
  border: 1px solid #e8e8e8;
  border-radius: 10px;
  padding: 1rem;
}

.compare-method {
  font-size: 14px;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 8px;
  font-family: 'Fira Code', monospace;
}

.compare-pro {
  font-size: 13px;
  color: #16a34a;
  margin-top: 8px;
  line-height: 1.5;
}

.compare-con {
  font-size: 13px;
  color: #dc2626;
  margin-top: 4px;
  line-height: 1.5;
}

.compare-winner {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 14px;
  color: #15803d;
  line-height: 1.6;
}

@media (prefers-color-scheme: dark) {
  .compare-block { border-color: #2a2a2a; }
  .compare-title { color: #e8e8e8; }
  .compare-card { background: #1a1a1a; border-color: #2a2a2a; }
  .compare-method { color: #e8e8e8; }
  .compare-winner { background: #0a1f0a; border-color: #1a4a1a; color: #4ade80; }
}