:root {
  color-scheme: light dark;
  --bg: #f7f7f9;
  --panel-bg: #ffffff;
  --border: #d8d8de;
  --text: #1f2328;
  --muted: #6b7280;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --error: #dc2626;
  --error-bg: #fef2f2;
  --success: #16a34a;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171d;
    --panel-bg: #1e1f27;
    --border: #33343d;
    --text: #e6e6e6;
    --muted: #9ca3af;
    --accent: #818cf8;
    --accent-hover: #a5b4fc;
    --error: #f87171;
    --error-bg: #3b1a1a;
    --success: #4ade80;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  padding: 1.5rem 2rem 0.5rem;
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 1.8rem;
  color: var(--accent);
}

.tagline {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1rem 2rem 2rem;
  gap: 1rem;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.toolbar button {
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.55rem 1.1rem;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s ease;
}

.toolbar button:hover {
  background: var(--accent-hover);
}

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

#clearBtn, #copyBtn {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

#clearBtn:hover, #copyBtn:hover {
  background: var(--panel-bg);
}

.indent-label {
  margin-left: auto;
  font-size: 0.85rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.view-toggle {
  font-size: 0.85rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
}

.indent-label select {
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel-bg);
  color: var(--text);
}

.panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  flex: 1;
  min-height: 400px;
}

@media (max-width: 800px) {
  .panels { grid-template-columns: 1fr; }
  .indent-label { margin-left: 0; }
}

.panel {
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.9rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.stats {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
}

.status.valid { color: var(--success); font-weight: 600; text-transform: none; }
.status.invalid { color: var(--error); font-weight: 600; text-transform: none; }

#input {
  flex: 1;
  border: none;
  resize: none;
  padding: 0.9rem;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.5;
  background: transparent;
  color: var(--text);
  outline: none;
  min-height: 350px;
}

#input.drag-over {
  outline: 2px dashed var(--accent);
  outline-offset: -4px;
  background: var(--error-bg);
}

.output {
  flex: 1;
  margin: 0;
  padding: 0.9rem;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.5;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 350px;
}

.tree-output {
  font-family: var(--mono);
  font-size: 0.85rem;
}

.tree-node {
  margin-left: 0.3rem;
}

.tree-node > summary {
  cursor: pointer;
  list-style: none;
}

.tree-node > summary::-webkit-details-marker {
  display: none;
}

.tree-node > summary::before {
  content: "▸";
  display: inline-block;
  width: 1em;
  color: var(--muted);
}

.tree-node[open] > summary::before {
  content: "▾";
}

.tree-children {
  margin-left: 1.1rem;
  border-left: 1px solid var(--border);
  padding-left: 0.6rem;
}

.tree-leaf {
  margin-left: 1.5rem;
  padding: 0.05rem 0;
}

.tree-bracket {
  color: var(--muted);
}

.tree-empty {
  margin-left: 1.5rem;
  color: var(--muted);
  font-style: italic;
}

.jkey { color: #a626a4; }
.jstr { color: #50a14f; }
.jnum { color: #986801; }
.jbool { color: #4078f2; }
.jnull { color: #986801; }

@media (prefers-color-scheme: dark) {
  .jkey { color: #c678dd; }
  .jstr { color: #98c379; }
  .jnum { color: #d19a66; }
  .jbool { color: #61afef; }
  .jnull { color: #d19a66; }
}

.error-box {
  border: 1px solid var(--error);
  background: var(--error-bg);
  color: var(--error);
  padding: 0.8rem 1rem;
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 0.85rem;
  white-space: pre-wrap;
}

.hidden { display: none; }

.search-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--border);
}

.search-bar input {
  flex: 1;
  padding: 0.35rem 0.55rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.82rem;
  outline: none;
}

.search-bar input:focus {
  border-color: var(--accent);
}

.search-bar button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 0.3rem 0.55rem;
  cursor: pointer;
  font-size: 0.8rem;
  line-height: 1;
}

.search-bar button:hover {
  background: var(--bg);
}

.search-count {
  font-size: 0.78rem;
  color: var(--muted);
  min-width: 3.5em;
  text-align: right;
}

.search-results {
  border-bottom: 1px solid var(--border);
  max-height: 220px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 0.82rem;
}

.search-results .path-row {
  display: flex;
  gap: 0.6rem;
  padding: 0.35rem 0.7rem;
  border-bottom: 1px dashed var(--border);
  cursor: pointer;
}

.search-results .path-row:hover {
  background: var(--bg);
}

.path {
  color: var(--accent);
  flex-shrink: 0;
}

.search-results .no-match {
  padding: 0.5rem 0.7rem;
  color: var(--muted);
}

.path-error {
  padding: 0.5rem 0.7rem;
  color: var(--error);
}

mark.hit {
  background: #fde68a;
  color: #1f2328;
  border-radius: 2px;
}

mark.hit.current {
  background: #fbbf24;
  outline: 1px solid var(--error);
}

.tree-node.match-path > summary {
  outline: 1px solid var(--accent);
  border-radius: 3px;
}

.extra-tools {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.tool-section {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.tool-section summary {
  cursor: pointer;
  padding: 0.7rem 1rem;
  font-weight: 600;
  font-size: 0.9rem;
  list-style: none;
}

.tool-section summary::-webkit-details-marker {
  display: none;
}

.tool-section summary::before {
  content: "▸ ";
  color: var(--muted);
}

.tool-section[open] summary::before {
  content: "▾ ";
}

.tool-body {
  padding: 0 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.tool-note {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.tool-body textarea {
  width: 100%;
  min-height: 140px;
  resize: vertical;
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 0.7rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  box-sizing: border-box;
}

.tool-actions button {
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
}

.tool-actions button:hover {
  background: var(--accent-hover);
}

.tool-result {
  font-family: var(--mono);
  font-size: 0.85rem;
}

.tool-result .ok {
  color: var(--success);
  font-weight: 600;
}

.tool-result ul {
  margin: 0.4rem 0 0;
  padding-left: 1.2rem;
}

.tool-result li {
  margin-bottom: 0.3rem;
}

.tool-result .err-path {
  color: var(--accent);
}

.diff-row {
  display: flex;
  gap: 0.5rem;
  padding: 0.3rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.2rem;
  flex-wrap: wrap;
}

.diff-row .badge {
  border-radius: 4px;
  padding: 0.05rem 0.4rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  flex-shrink: 0;
  height: fit-content;
}

.diff-row.added { background: rgba(22, 163, 74, 0.1); }
.diff-row.added .badge { background: var(--success); color: #06280f; }

.diff-row.removed { background: rgba(220, 38, 38, 0.1); }
.diff-row.removed .badge { background: var(--error); color: #3b0a0a; }

.diff-row.changed { background: rgba(217, 119, 6, 0.1); }
.diff-row.changed .badge { background: #d97706; color: #2a1600; }

.diff-summary {
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
}

footer {
  text-align: center;
  padding: 1rem;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 600;
}

footer p {
  margin: 0.2rem 0;
  font-size: 1rem;
}

.copyright {
  font-weight: 400;
  color: var(--muted);
  margin-top: 1rem !important;
}

.rights {
  font-weight: 400;
  color: var(--muted);
  margin-top: 0.15rem !important;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

.faq-section {
  width: 40vw;
  min-width: 280px;
  max-width: 640px;
  margin: 1.5rem auto 0.5rem;
  text-align: left;
}

.faq-section h2 {
  margin: 0 0 0.7rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  text-align: center;
}

.faq-item {
  margin-bottom: 0.5rem;
}

.faq-item summary {
  font-size: 0.95rem;
}

.faq-answer {
  margin: 0;
  padding: 0 1rem 0.9rem;
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text);
  line-height: 1.5;
}

@media (max-width: 700px) {
  .faq-section {
    width: 90vw;
  }
}

.developer-btn {
  display: inline-block;
  margin-top: 0.4rem;
  padding: 0.55rem 1.6rem;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #fff !important;
  text-decoration: none !important;
  border-radius: 999px;
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 55%, #ec4899 100%);
  background-size: 200% 200%;
  background-position: 0% 50%;
  box-shadow: 0 4px 16px rgba(168, 85, 247, 0.45);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-position 0.4s ease;
}

.developer-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(236, 72, 153, 0.55);
  background-position: 100% 50%;
}

.developer-btn:active {
  transform: translateY(0);
  box-shadow: 0 3px 10px rgba(168, 85, 247, 0.45);
}

.developer-btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
}

/* Floating action buttons (Tally feedback, Ko-fi support) — same size/font, stacked bottom-right.
   Built as plain same-origin buttons rather than embedding Ko-fi's own widget script: that widget
   renders inside a cross-origin iframe, whose internal font size a parent page's CSS cannot reach
   at all, making an exact font match with the Tally button impossible any other way. */
.floating-action-btn {
  position: fixed;
  right: 20px;
  z-index: 9998;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 92px;
  color: #fff;
  border: none;
  padding: 0.65rem 1.2rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 700;
  font-family: inherit;
  text-decoration: none !important;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.floating-action-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
}

.floating-action-btn:active {
  transform: translateY(0);
}

.floating-action-btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
}

.tally-float-btn {
  bottom: 90px;
  background: var(--accent);
}

.tally-float-btn:hover {
  background: var(--accent-hover);
}

.kofi-float-btn {
  bottom: 20px;
  background: #00b9fe;
}

.kofi-float-btn:hover {
  background: #009fdb;
}

@media (max-width: 480px) {
  .floating-action-btn {
    right: 12px;
    min-width: 80px;
    padding: 0.55rem 0.95rem;
    font-size: 0.8rem;
  }
  .tally-float-btn { bottom: 76px; }
  .kofi-float-btn { bottom: 14px; }
}