:root {
  --purple-900: #3b1d6e;
  --purple-700: #6d28d9;
  --purple-600: #7c3aed;
  --purple-100: #f3e8ff;
  --purple-50: #faf5ff;
  --white: #ffffff;
  --text: #2e1a47;
  --muted: #6b5b80;
  --error: #b42318;
  --error-bg: #fff1f0;
  --success: #067647;
  --success-bg: #ecfdf3;
  --shadow: 0 16px 40px rgba(109, 40, 217, 0.12);
  --radius: 18px;
  --line-height: 22px;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; min-height: 100%; }

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, #e9d5ff 0%, transparent 42%),
    linear-gradient(180deg, var(--purple-50) 0%, var(--white) 100%);
}

.page {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 48px;
}

.eyebrow { margin: 0 0 8px; font-size: 0.82rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }
.eyebrow a { color: var(--purple-700); text-decoration: none; }
.eyebrow a:hover { text-decoration: underline; }

h1 { margin: 0 0 10px; color: var(--purple-900); font-size: clamp(2rem, 5vw, 3rem); line-height: 1.15; }

.subtitle { margin: 0 0 24px; max-width: 720px; color: var(--muted); font-size: 1.05rem; line-height: 1.6; }

.workspace { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }

.panel, .info-section, .step-card {
  background: var(--white);
  border: 1px solid #e9d8fd;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel { padding: 22px; }
.panel-head h2, .info-section h2, .how-to-section h2 { margin: 0 0 12px; color: var(--purple-900); font-size: clamp(1.25rem, 3vw, 1.6rem); line-height: 1.3; }

.editor-label { display: block; margin-bottom: 8px; font-weight: 700; color: var(--purple-900); }

.editor-shell {
  display: flex;
  height: 480px;
  border: 1px solid #ddc8f5;
  border-radius: 14px;
  background: #fdfbff;
  overflow: hidden;
}

.editor-shell:focus-within { border-color: var(--purple-600); box-shadow: 0 0 0 3px #d8b4fe; }

.gutter {
  flex: 0 0 auto;
  overflow: hidden;
  padding: 0 8px;
  background: #f6f0fc;
  color: #8b78a8;
  text-align: right;
  user-select: none;
}

.line-numbers, .editor {
  font-family: Consolas, "Courier New", monospace;
  font-size: 14px;
  line-height: var(--line-height);
}

.line-numbers { margin: 0; white-space: pre; }

.editor {
  flex: 1;
  width: 100%;
  height: 100%;
  margin: 0;
  border: 0;
  resize: none;
  padding: 12px;
  background: transparent;
  color: var(--text);
  overflow: auto;
  white-space: pre;
}

.editor:focus { outline: none; }

.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }

.btn, .toggle, .copy-path, .show-more {
  font: inherit;
  cursor: pointer;
}

.btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font-size: 0.95rem;
  font-weight: 700;
}

.btn-primary { color: var(--white); background: var(--purple-700); box-shadow: 0 8px 18px rgba(109, 40, 217, 0.28); }
.btn-secondary { color: var(--purple-700); background: var(--purple-100); }
.btn-ghost { color: var(--purple-900); background: var(--white); border: 1px solid #e4d4f5; }

.btn:focus-visible, .toggle:focus-visible, .copy-path:focus-visible, .show-more:focus-visible, .search-input:focus-visible, .tree:focus-visible {
  outline: 3px solid #d8b4fe;
  outline-offset: 2px;
}

.search-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #ddc8f5;
  border-radius: 12px;
  background: #fdfbff;
  color: var(--text);
  font: inherit;
}

.legend { display: flex; flex-wrap: wrap; gap: 12px; margin: 12px 0; color: var(--muted); font-size: 0.86rem; }

.tree {
  max-height: 640px;
  overflow: auto;
  padding: 8px;
  border: 1px solid #eadcff;
  border-radius: 14px;
  background: #fdfbff;
}

.tree-empty { margin: 8px; color: var(--muted); line-height: 1.5; }

.tree-node { margin: 2px 0; }

.tree-row {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  padding: 3px 4px;
  border-radius: 8px;
}

.tree-row.is-match { background: var(--purple-100); }

.toggle {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--purple-700);
  font-weight: 700;
}

.toggle-spacer { display: inline-block; width: 28px; height: 28px; }

.token { overflow-wrap: anywhere; line-height: 1.45; }
.token-key { color: var(--purple-900); font-weight: 700; }
.token-punct { color: var(--muted); }
.token-string { color: var(--success); }
.token-number { color: #6d28d9; }
.token-boolean { color: #7c3aed; }
.token-null { color: var(--muted); font-style: italic; }
.token-object, .token-array { color: #5b21b6; }

.copy-path, .show-more {
  border: 1px solid #e4d4f5;
  border-radius: 999px;
  background: var(--white);
  color: var(--purple-700);
  font-size: 0.78rem;
  font-weight: 700;
}

.copy-path { margin-left: auto; padding: 4px 8px; white-space: nowrap; }
.show-more { margin: 6px 0 6px 34px; padding: 8px 12px; }

.tree-children { margin-left: 14px; padding-left: 10px; border-left: 1px solid #eadcff; }

mark.match { background: #e9d5ff; color: inherit; padding: 0 1px; border-radius: 3px; }

.status { min-height: 1.4em; margin: 14px 0 0; font-size: 0.95rem; line-height: 1.5; }
.status.error, .status.success { border-radius: 10px; padding: 10px 12px; }
.status.error { color: var(--error); background: var(--error-bg); }
.status.success { color: var(--success); background: var(--success-bg); }

.info-section, .how-to-section { margin-top: 24px; }
.info-section { padding: 22px; }
.info-section p, .step-card p { margin: 0 0 12px; color: var(--muted); font-size: 1.02rem; line-height: 1.7; }
.info-section h3 { margin: 16px 0 8px; color: var(--purple-700); font-size: 1.05rem; }
.info-section a { color: var(--purple-700); font-weight: 700; }

.json-example {
  margin: 8px 0 20px;
  padding: 16px;
  overflow-x: auto;
  max-width: 100%;
  border: 1px solid #eadcff;
  border-radius: 14px;
  background: #fdfbff;
  color: var(--text);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.92rem;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.step-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.step-card { padding: 20px; }
.step-card h3 { margin: 0 0 8px; color: var(--purple-700); font-size: 1.05rem; }
.step-card p { margin: 0; }
.footer { margin-top: 18px; color: var(--muted); font-size: 0.9rem; }

@media (max-width: 860px) {
  .page { width: min(100% - 24px, 1180px); padding: 24px 0 36px; }
  .workspace, .step-grid { grid-template-columns: 1fr; }
  .panel, .info-section, .step-card { padding: 16px; }
  .editor-shell { height: 320px; }
  .tree { max-height: 480px; }
  .btn, .search-input { width: 100%; }
  .copy-path { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .btn { transition: none; }
}