:root {
  --bg: #FAFAF7;
  --panel: #FFFFFF;
  --panel-2: #F2F0E9;
  --ink: #1C1E26;
  --ink-dim: #6B6A63;
  --border: #E4E1D8;
  --accent: #2952CC;
  --accent-ink: #FFFFFF;
  --accent-soft: #E9EDFB;
  --good: #1F8A5F;
  --bad: #C4432B;
  --str: #1F8A5F;
  --num: #2952CC;
  --bool: #8A4FCC;
  --null: #8B897E;
  --key: #1C1E26;
  --shadow: 0 1px 2px rgba(28,30,38,.04), 0 6px 20px rgba(28,30,38,.06);
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15161C;
    --panel: #1C1E26;
    --panel-2: #23252F;
    --ink: #ECEBE6;
    --ink-dim: #9C9A91;
    --border: #34353F;
    --accent: #6E8CF5;
    --accent-ink: #101223;
    --accent-soft: #26304F;
    --good: #4FCE9B;
    --bad: #E77A63;
    --str: #4FCE9B;
    --num: #6E8CF5;
    --bool: #B48CF0;
    --null: #7D7C74;
    --shadow: 0 1px 2px rgba(0,0,0,.25), 0 10px 30px rgba(0,0,0,.35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #15161C;
  --panel: #1C1E26;
  --panel-2: #23252F;
  --ink: #ECEBE6;
  --ink-dim: #9C9A91;
  --border: #34353F;
  --accent: #6E8CF5;
  --accent-ink: #101223;
  --accent-soft: #26304F;
  --good: #4FCE9B;
  --bad: #E77A63;
  --str: #4FCE9B;
  --num: #6E8CF5;
  --bool: #B48CF0;
  --null: #7D7C74;
  --shadow: 0 1px 2px rgba(0,0,0,.25), 0 10px 30px rgba(0,0,0,.35);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body {
  min-height: 100%;
  margin: 0;
}
html { scroll-padding-top: env(safe-area-inset-top, 0px); }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--accent-soft); }

.app { display: flex; flex-direction: column; height: 100vh; }

/* ---------- Header ---------- */
header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  gap: 16px;
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand .mark {
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 600; font-size: 20px; color: var(--accent);
}
.brand .name { font-weight: 700; font-size: 19px; letter-spacing: -0.01em; }
.brand .tag { color: var(--ink-dim); font-size: 13px; display: none; }
@media (min-width: 760px) { .brand .tag { display: inline; } }

.search-wrap {
  display: flex; align-items: center; gap: 8px;
  background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 8px; padding: 7px 10px; flex: 1; max-width: 340px;
  color: var(--ink-dim);
}
.search-wrap input {
  border: none; background: transparent; outline: none; color: var(--ink);
  font-family: 'IBM Plex Mono', monospace; font-size: 13px; width: 100%;
}
.search-wrap svg { flex-shrink: 0; }
.search-count { font-size: 12px; color: var(--ink-dim); white-space: nowrap; }

.header-actions { display: flex; align-items: center; gap: 8px; }

button { font-family: inherit; cursor: pointer; }
.icon-btn {
  width: 34px; height: 34px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--panel);
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-dim); transition: background .15s, color .15s, border-color .15s;
}
.icon-btn:hover { background: var(--panel-2); color: var(--ink); }

.btn {
  border-radius: 8px; border: 1px solid var(--border); background: var(--panel);
  color: var(--ink); font-size: 13px; font-weight: 500; padding: 8px 13px;
  display: inline-flex; align-items: center; gap: 6px;
  transition: background .15s, border-color .15s;
}
.btn:hover { background: var(--panel-2); }
.btn-primary {
  background: var(--accent); color: var(--accent-ink); border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent); filter: brightness(1.1); }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* ---------- Toolbar ---------- */
.toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 16px; border-bottom: 1px solid var(--border);
  background: var(--panel-2); gap: 10px; flex-wrap: wrap;
}
.toolbar .group { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.meta { font-family: 'IBM Plex Mono', monospace; font-size: 12px; color: var(--ink-dim); }

/* ---------- Main split ---------- */
main {
  flex: 1; display: flex; min-height: 0;
  overflow-x: auto;
}
@media (max-width: 860px) { main { flex-direction: column; } }

.pane {
  flex: 1; min-width: 0; display: flex; flex-direction: column;
  border-right: 1px solid var(--border);
}
.pane:last-child { border-right: none; }
@media (max-width: 860px) {
  .pane { border-right: none; border-bottom: 1px solid var(--border); min-height: 420px; }
}

.pane-head {
  padding: 10px 16px; font-size: 12px; font-weight: 600; letter-spacing: 0.02em;
  color: var(--ink-dim); background: var(--panel); border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
}

textarea#input {
  flex: 1; resize: none; border: none; outline: none;
  background: var(--panel); color: var(--ink);
  font-family: 'IBM Plex Mono', monospace; font-size: 13.5px; line-height: 1.65;
  padding: 16px; width: 100%;
}

.error-banner {
  display: none; align-items: flex-start; gap: 8px;
  background: color-mix(in srgb, var(--bad) 12%, var(--panel));
  color: var(--bad); border-top: 1px solid var(--border);
  padding: 10px 16px; font-size: 12.5px; font-family: 'IBM Plex Mono', monospace;
}
.error-banner.show { display: flex; }

.output-scroll {
  flex: 1; overflow: auto; background: var(--panel);
  padding: 14px 10px;
}
.tree, .tree * { font-family: 'IBM Plex Mono', monospace; font-size: 13.5px; line-height: 1.75; }

/* ---------- Tree node styling ---------- */
.node-line {
  position: relative; display: flex; align-items: flex-start;
  padding: 1px 8px 1px 4px; border-radius: 6px;
  white-space: pre-wrap; word-break: break-word;
}
.node-line.hoverable:hover { background: var(--panel-2); }
.node-line mark { background: color-mix(in srgb, var(--accent) 35%, transparent); color: inherit; border-radius: 3px; }

.toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 15px; height: 20px; flex-shrink: 0; color: var(--ink-dim);
  cursor: pointer; user-select: none;
}
.toggle svg { transition: transform .12s; }
.toggle.collapsed svg { transform: rotate(-90deg); }
.no-toggle { width: 15px; flex-shrink: 0; }

.indent { flex-shrink: 0; }
.k { color: var(--key); font-weight: 500; }
.k .qm { color: var(--ink-dim); }
.colon { color: var(--ink-dim); margin: 0 4px 0 1px; }
.punc { color: var(--ink-dim); }
.v-str { color: var(--str); }
.v-num { color: var(--num); }
.v-bool { color: var(--bool); }
.v-null { color: var(--null); }
.summary { color: var(--ink-dim); font-style: normal; }

.node-tools {
  margin-left: 10px; display: none; gap: 4px; flex-shrink: 0;
}
.node-line.hoverable:hover .node-tools { display: inline-flex; }
.tool-btn {
  display: inline-flex; align-items: center; gap: 4px;
  font-family: 'Space Grotesk', sans-serif; font-size: 11px; font-weight: 500;
  color: var(--ink-dim); background: var(--panel); border: 1px solid var(--border);
  border-radius: 5px; padding: 2px 7px; line-height: 1.5;
}
.tool-btn:hover { color: var(--accent); border-color: var(--accent); }
.tool-btn.copied { color: var(--good); border-color: var(--good); }

.children { margin-left: 15px; border-left: 1px dashed var(--border); padding-left: 0; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: calc(24px + env(safe-area-inset-bottom, 0px)); left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: var(--ink); color: var(--bg);
  padding: 9px 16px; border-radius: 8px; font-size: 13px; font-weight: 500;
  opacity: 0; pointer-events: none; transition: opacity .18s, transform .18s;
  z-index: 100; box-shadow: var(--shadow);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Modal ---------- */
.overlay {
  position: fixed; inset: 0; background: rgba(15,16,20,.45);
  display: none; align-items: center; justify-content: center; z-index: 200; padding: 20px;
}
.overlay.show { display: flex; }
.modal {
  background: var(--panel); border-radius: 14px; width: 100%; max-width: 440px;
  box-shadow: var(--shadow); border: 1px solid var(--border); overflow: hidden;
}
.modal-head {
  padding: 18px 20px 0 20px; display: flex; justify-content: space-between; align-items: flex-start;
}
.modal-head h3 { margin: 0 0 4px 0; font-size: 17px; }
.modal-head p { margin: 0; font-size: 13px; color: var(--ink-dim); line-height: 1.5; }
.modal-body { padding: 16px 20px 20px 20px; }
.link-row {
  display: flex; gap: 8px; align-items: center;
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 10px; margin-top: 14px;
}
.link-row input {
  flex: 1; border: none; background: transparent; outline: none; color: var(--ink);
  font-family: 'IBM Plex Mono', monospace; font-size: 12.5px;
}
.expiry-row {
  margin-top: 14px; display: flex; align-items: center; justify-content: space-between;
  font-size: 12.5px; color: var(--ink-dim);
}
.expiry-row .clock { font-family: 'IBM Plex Mono', monospace; color: var(--accent); font-weight: 600; }
.close-x {
  background: none; border: none; color: var(--ink-dim); font-size: 20px; line-height: 1;
  padding: 4px; margin: -4px -4px 0 0;
}

.seo-content h1 { font-size: 28px; margin-bottom: 12px; }
.seo-content h2 { font-size: 20px; margin-top: 32px; margin-bottom: 12px; border-bottom: 1px solid var(--border); padding-bottom: 8px; }
.seo-content p { line-height: 1.6; color: var(--ink); margin-bottom: 16px; }
.seo-content ul, .seo-content ol { line-height: 1.6; margin-bottom: 16px; padding-left: 24px; }
.seo-content li { margin-bottom: 8px; }
.seo-content details { margin-bottom: 12px; background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 12px 16px; }
.seo-content summary { font-weight: 500; cursor: pointer; outline: none; list-style: none; display: flex; align-items: center; justify-content: space-between; }
.seo-content summary::-webkit-details-marker { display: none; }
.seo-content summary:after { content: '+'; font-size: 18px; color: var(--ink-dim); }
.seo-content details[open] summary:after { content: '−'; }
.seo-content details p { margin-top: 12px; margin-bottom: 0; color: var(--ink-dim); font-size: 15px; }