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

/* ===== DESIGN TOKENS ===== */
:root {
  --bg:       #0c0c0c;
  --bg2:      #111111;
  --bg3:      #181818;
  --border:   #252525;
  --border2:  #303030;

  --text:     #d0d0d0;
  --text-dim: #555555;
  --text-mid: #888888;

  --green:    #3ddc84;
  --green-dk: #1a4a30;
  --red:      #f16363;
  --blue:     #5b9cf6;
  --amber:    #f0c040;
  --purple:   #b48eff;
  --orange:   #f0874a;
  --slate:    #7a8694;

  --font: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --h-header: 44px;
  --h-tabs:   38px;
  --h-bar:    32px;

  --radius:   2px;
  --trans:    0.15s ease;
}

/* ===== BASE ===== */
html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== SCROLLBARS ===== */
::-webkit-scrollbar        { width: 5px; height: 5px; }
::-webkit-scrollbar-track  { background: transparent; }
::-webkit-scrollbar-thumb  { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #444; }

/* ===== HEADER ===== */
header {
  position: relative;
  z-index: 10;
  height: var(--h-header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
}

.logo {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--text);
  user-select: none;
}

.logo .accent { color: var(--green); }

.header-actions {
  display: flex;
  gap: 5px;
}

.header-actions button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-mid);
  padding: 4px 10px;
  font-family: var(--font);
  font-size: 11px;
  letter-spacing: 0.04em;
  cursor: pointer;
  border-radius: var(--radius);
  transition: color var(--trans), border-color var(--trans), background var(--trans);
  white-space: nowrap;
}

.header-actions button:hover {
  color: var(--text);
  border-color: var(--border2);
  background: var(--bg3);
}

.header-actions button:active {
  color: var(--green);
  border-color: var(--green-dk);
}

/* ===== TABS (mobile) ===== */
.tabs {
  display: none;
  height: var(--h-tabs);
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
}

@media (max-width: 767px) {
  .tabs { display: flex; }
}

.tab {
  flex: 1;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 11px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: color var(--trans), border-color var(--trans);
  padding: 0 8px;
}

.tab:hover  { color: var(--text-mid); }
.tab.active {
  color: var(--green);
  border-bottom-color: var(--green);
}

/* ===== MAIN LAYOUT ===== */
main {
  display: flex;
  height: calc(var(--vh, 1vh) * 100 - var(--h-header));
  height: calc(100dvh - var(--h-header));
  overflow: hidden;
}

@media (max-width: 767px) {
  main {
    height: calc(var(--vh, 1vh) * 100 - var(--h-header) - var(--h-tabs));
    height: calc(100dvh - var(--h-header) - var(--h-tabs));
    flex-direction: column;
  }
  .divider { display: none; }
}

/* ===== DIVIDER (desktop resize) ===== */
.divider {
  width: 4px;
  background: var(--border);
  cursor: col-resize;
  flex-shrink: 0;
  transition: background var(--trans);
  position: relative;
  z-index: 1;
}

.divider:hover,
.divider.dragging {
  background: var(--green-dk);
}

/* ===== PANE ===== */
.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  flex: 1;
  overflow: hidden;
}

@media (max-width: 767px) {
  .pane { height: 100%; flex: none; }
  .pane.hidden { display: none; }
}

.pane-bar {
  height: var(--h-bar);
  min-height: var(--h-bar);
  padding: 0 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.pane-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

/* ===== STATUS ===== */
.status {
  font-size: 11px;
  font-family: var(--font);
  letter-spacing: normal;
  transition: color var(--trans);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: right;
}

.status.ok    { color: var(--green); }
.status.error { color: var(--red); }

/* ===== COMPACT TOGGLE ===== */
.toggle-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 11px;
  color: var(--text-mid);
  user-select: none;
  letter-spacing: 0.04em;
}

.toggle-wrap input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 13px;
  height: 13px;
  border: 1px solid var(--border2);
  border-radius: 2px;
  background: var(--bg);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: background var(--trans), border-color var(--trans);
}

.toggle-wrap input[type="checkbox"]:checked {
  background: var(--green);
  border-color: var(--green);
}

.toggle-wrap input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  top: 1px; left: 3px;
  width: 4px; height: 7px;
  border: 2px solid var(--bg);
  border-top: none; border-left: none;
  transform: rotate(45deg);
}

/* ===== EDITOR WRAP ===== */
.editor-wrap {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--bg);
  min-width: 0;
}

/* Focus ring on the wrap when textarea is focused */
.editor-wrap:focus-within {
  box-shadow: inset 1px 0 0 var(--green-dk);
}

/* ===== HIGHLIGHT LAYER (behind textarea) ===== */
.editor-hl {
  position: absolute;
  top: 0;
  left: 0;
  /* width/height set wider than container so long lines render fully */
  min-width: 100%;
  min-height: 100%;
  margin: 0;
  padding: 14px 14px 14px 16px;
  font-family: var(--font);
  /* Match textarea font-size exactly - prevent iOS zoom */
  font-size: max(13px, 16px);
  line-height: 1.75;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  tab-size: 2;
  -moz-tab-size: 2;
  pointer-events: none;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  /* GPU-accelerated pan via scroll sync */
  will-change: transform;
  /* Prevent any transform origin issues */
  transform-origin: top left;
}

@media (min-width: 768px) {
  .editor-hl { font-size: 13px; }
}

/* ===== EDITOR TEXTAREA (on top, transparent text) ===== */
#editor {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  background: transparent;
  /* Text transparent so highlight layer shows through */
  color: transparent;
  /* Keep caret visible - supported on Android Chrome 57+, iOS Safari 11.1+ */
  caret-color: var(--green);
  border: none;
  outline: none;
  resize: none;
  font-family: var(--font);
  font-size: max(13px, 16px);
  line-height: 1.75;
  padding: 14px 14px 14px 16px;
  tab-size: 2;
  -moz-tab-size: 2;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 1;
  /* Keep selection visible on mobile */
  -webkit-user-select: text;
  user-select: text;
}

@media (min-width: 768px) {
  #editor { font-size: 13px; }
}

#editor::placeholder {
  /* Placeholder must be visible even with transparent text */
  color: var(--text-dim);
  opacity: 0.6;
  -webkit-text-fill-color: var(--text-dim);
}

/* ===== INPUT SYNTAX HIGHLIGHT COLORS ===== */
.i-cmt  { color: var(--text-dim); font-style: italic; }
.i-key  { color: var(--blue); }
.i-colon{ color: var(--text-dim); }
.i-dash { color: var(--green); font-weight: 700; }
.i-str  { color: var(--amber); }
.i-num  { color: var(--purple); }
.i-bool { color: var(--orange); }
.i-null { color: var(--slate); font-style: italic; }
.i-inline { color: var(--text-mid); }

/* ===== OUTPUT ===== */
#output {
  flex: 1;
  overflow-y: auto;
  padding: 14px 16px;
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.75;
  background: var(--bg);
  white-space: pre;
  word-break: normal;
  overflow-x: auto;
}

/* ===== JSON SYNTAX COLORS ===== */
.j-key  { color: var(--blue); }
.j-str  { color: var(--amber); }
.j-num  { color: var(--purple); }
.j-bool { color: var(--orange); }
.j-null { color: var(--slate); font-style: italic; }
.j-punc { color: var(--text-dim); }
.j-err  { color: var(--red); font-style: italic; }

/* ===== HELP PANEL ===== */
.help-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 19;
}

.help-overlay.visible { display: block; }

.help-panel {
  position: fixed;
  top: 0;
  right: -340px;
  width: 320px;
  height: 100%;
  background: var(--bg2);
  border-left: 1px solid var(--border);
  z-index: 20;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transition: right 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

.help-panel.open { right: 0; }

@media (max-width: 360px) {
  .help-panel { width: 100%; right: -100%; }
}

.help-header {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  height: var(--h-header);
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

#help-close {
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 14px;
  padding: 4px;
  border-radius: var(--radius);
  line-height: 1;
  transition: color var(--trans);
}

#help-close:hover { color: var(--text); }

.help-body {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.help-block {}

.help-title {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--green);
  margin-bottom: 6px;
  font-weight: 500;
}

.help-code {
  font-family: var(--font);
  font-size: 12px;
  line-height: 1.75;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  overflow-x: auto;
  white-space: pre;
}

/* Help code inline colors */
.help-code .k { color: var(--blue); }
.help-code .v { color: var(--amber); }
.help-code .s { color: var(--green); }
.help-code .c { color: var(--text-dim); font-style: italic; }

/* ===== TOAST ===== */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border2);
  padding: 7px 16px;
  border-radius: 3px;
  font-size: 12px;
  letter-spacing: 0.03em;
  opacity: 0;
  pointer-events: none;
  z-index: 999;
  white-space: nowrap;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.err {
  border-color: var(--red);
  color: var(--red);
}

/* ===== LINE NUMBERS (editor gutter illusion) ===== */
#pane-editor {
  position: relative;
}

/* ===== SELECTION ===== */
::selection {
  background: rgba(61, 220, 132, 0.18);
}

/* ===== RESPONSIVE TWEAKS ===== */
@media (max-width: 767px) {
  .header-actions button { padding: 4px 8px; }
}

/* ===== LANGUAGE TOGGLE BUTTON ===== */
.btn-lang-toggle {
  margin-left: 2px;
  border-left: 1px solid var(--border2) !important;
  padding-left: 10px !important;
  color: var(--green) !important;
  border-color: var(--green-dk) !important;
  font-weight: 500;
  letter-spacing: 0.08em !important;
}

.btn-lang-toggle:hover {
  background: rgba(61, 220, 132, 0.08) !important;
  border-color: var(--green) !important;
}

/* ===== PANE-BAR RIGHT GROUP ===== */
.pane-bar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Small action button inside pane-bar */
.pane-btn {
  padding: 2px 8px;
  font-family: var(--font);
  font-size: 10px;
  line-height: 1.6;
  background: transparent;
  color: var(--text-mid);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  cursor: pointer;
  letter-spacing: 0.05em;
  transition: color var(--trans), border-color var(--trans), background var(--trans);
  white-space: nowrap;
}
.pane-btn:hover {
  color: var(--green);
  border-color: var(--green-dk);
  background: rgba(61, 220, 132, 0.06);
}

/* ===== IMPORT JSON MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 16px;
  /* backdrop blur — cosmetic, degrades gracefully */
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  /* Animate in */
  animation: fadeIn 0.12s ease;
}
.modal-overlay[aria-hidden="true"] { display: none; }

@keyframes fadeIn { from { opacity: 0 } to { opacity: 1 } }

.modal {
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  width: 100%;
  max-width: 540px;
  max-height: calc(100vh - 48px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  /* Slide-up on mobile */
  animation: slideUp 0.14s ease;
}
@keyframes slideUp { from { transform: translateY(10px); opacity: 0 } to { transform: none; opacity: 1 } }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-mid);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 14px;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: var(--radius);
  line-height: 1;
  font-family: var(--font);
  transition: color var(--trans);
}
.modal-close:hover { color: var(--text); }

/* JSON paste textarea */
.import-ta {
  flex: 1;
  min-height: 220px;
  max-height: 420px;
  resize: none;
  background: var(--bg);
  color: var(--text);
  border: none;
  outline: none;
  font-family: var(--font);
  font-size: max(12px, 16px);
  line-height: 1.7;
  padding: 12px 14px;
  tab-size: 2;
  overflow-y: auto;
  caret-color: var(--green);
}
@media (min-width: 768px) {
  .import-ta { font-size: 12px; }
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 14px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.import-msg {
  font-size: 11px;
  color: var(--text-dim);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.import-msg.ok  { color: var(--green); }
.import-msg.err { color: var(--red); }

.modal-actions { display: flex; gap: 6px; flex-shrink: 0; }

.modal-btn {
  padding: 4px 14px;
  font-family: var(--font);
  font-size: 11px;
  background: transparent;
  color: var(--text-mid);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: color var(--trans), border-color var(--trans), background var(--trans);
  white-space: nowrap;
}
.modal-btn:hover:not(:disabled) {
  color: var(--text);
  border-color: var(--border2);
  background: var(--bg3);
}
.modal-btn-ok {
  color: var(--green);
  border-color: var(--green-dk);
}
.modal-btn-ok:hover:not(:disabled) {
  background: rgba(61, 220, 132, 0.08);
}
.modal-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}