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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, rgba(96, 120, 255, 0.12), transparent 28%),
    radial-gradient(circle at bottom right, rgba(95, 125, 255, 0.08), transparent 28%),
    #080a13;
  color: #e0e0e0;
  display: flex;
  align-items: stretch;
}

/* ---- Layout ---- */
.container {
  display: grid;
  grid-template-columns: 300px 1fr;
  width: 100%;
  height: 100vh;
}

/* ---- Sidebar ---- */
.panel {
  background: rgba(12, 16, 34, 0.98);
  border-right: 1px solid rgba(70, 80, 150, 0.18);
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.panel-header {
  padding: 24px 20px 18px;
  border-bottom: 1px solid rgba(71, 88, 197, 0.2);
  background: linear-gradient(180deg, rgba(30, 37, 74, 0.98), rgba(11, 14, 30, 0.98));
  flex-shrink: 0;
}

.brand-title {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 10px;
}

.brand-logo {
  width: 96px;
  height: auto;
  min-width: 96px;
  border-radius: 18px;
  padding: 8px;
  background: transparent;
  filter: drop-shadow(0 0 18px rgba(95, 125, 255, 0.35));
}

.brand-label {
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #8ea0ff;
  margin-bottom: 4px;
}

.panel-header h1 {
  font-size: 22px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.3px;
  margin: 0;
}

.tool-tagline {
  margin: 6px 0 0;
  font-size: 12px;
  color: #b5bfff;
  max-width: 260px;
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scrollbar-width: thin;
  scrollbar-color: #2a2a2a transparent;
}

.panel-body::-webkit-scrollbar { width: 4px; }
.panel-body::-webkit-scrollbar-track { background: transparent; }
.panel-body::-webkit-scrollbar-thumb { background: #2a2a2a; border-radius: 4px; }

/* ---- Section title ---- */
.section-title {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: #444;
  margin-bottom: 8px;
}

/* ---- Textarea ---- */
textarea {
  width: 100%;
  background: #111420;
  border: 1px solid #1e2340;
  border-radius: 8px;
  color: #e0e0e0;
  font-size: 12px;
  font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
  padding: 10px;
  resize: vertical;
  height: 220px;
  outline: none;
  transition: border-color .15s;
  line-height: 1.5;
}
textarea:focus { border-color: #3a4070; }

/* ---- Row ---- */
.row { display: flex; gap: 8px; align-items: center; }
.row label { flex: 1; font-size: 12px; color: #888; }

/* ---- Select ---- */
select {
  background: #1a1a1a;
  border: 1px solid #2a2a2a;
  border-radius: 7px;
  color: #e0e0e0;
  font-size: 12px;
  padding: 5px 8px;
  outline: none;
  cursor: pointer;
  flex: 1.5;
}
select:focus { border-color: #3a3a3a; }

/* ---- Toggle switch ---- */
.toggle {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
  flex-shrink: 0;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: #1e1e1e;
  border: 1px solid #2a2a2a;
  border-radius: 20px;
  transition: background .2s;
}
.slider::before {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  left: 2px;
  top: 50%;
  transform: translateY(-50%);
  background: #444;
  border-radius: 50%;
  transition: transform .2s, background .2s;
}
.toggle input:checked + .slider { background: rgba(95, 125, 255, 0.25); border-color: #5f7dff; }
.toggle input:checked + .slider::before { transform: translate(16px, -50%); background: #5f7dff; }

/* ---- Divider ---- */
hr { border: none; border-top: 1px solid #1c1c1c; }

/* ---- Action buttons ---- */
.action-buttons {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.btn {
  background: #5f7dff;
  color: #fff;
  border: none;
  border-radius: 9px;
  padding: 9px 18px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .15s, background-color .15s;
  width: 100%;
}
.btn:hover { transform: translateY(-1px); background: #718cff; }
.btn.secondary {
  background: rgba(95, 125, 255, 0.1);
  color: #e2e8ff;
  border: 1px solid rgba(95, 125, 255, 0.25);
  font-weight: 500;
}
.btn.secondary:hover { background: rgba(95, 125, 255, 0.18); }

/* ---- Output side ---- */
.output-side {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.output-topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border-bottom: 1px solid rgba(70, 80, 150, 0.18);
  background: rgba(10, 13, 28, 0.8);
  flex-shrink: 0;
}

.status-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 0.05em;
}
.status-badge.idle     { background: rgba(100,100,120,0.2); color: #666; border: 1px solid #222; }
.status-badge.valid    { background: rgba(0, 200, 120, 0.12); color: #00c878; border: 1px solid rgba(0,200,120,0.25); }
.status-badge.invalid  { background: rgba(255, 80, 80, 0.12); color: #ff6060; border: 1px solid rgba(255,80,80,0.25); }

.output-meta {
  flex: 1;
  font-size: 11px;
  color: #444;
  font-family: monospace;
}

.copy-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(95, 125, 255, 0.1);
  color: #8ea0ff;
  border: 1px solid rgba(95, 125, 255, 0.2);
  border-radius: 7px;
  padding: 5px 12px;
  font-size: 12px;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.copy-btn:hover { background: rgba(95, 125, 255, 0.2); color: #fff; }
.copy-btn.copied { color: #00c878; border-color: rgba(0,200,120,0.3); background: rgba(0,200,120,0.08); }

/* ---- Output pre ---- */
.output-wrapper {
  flex: 1;
  overflow: auto;
  padding: 20px;
  scrollbar-width: thin;
  scrollbar-color: #1e1e1e transparent;
}
.output-wrapper::-webkit-scrollbar { width: 6px; height: 6px; }
.output-wrapper::-webkit-scrollbar-track { background: transparent; }
.output-wrapper::-webkit-scrollbar-thumb { background: #1e1e1e; border-radius: 4px; }

#json-output {
  font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.7;
  white-space: pre;
  margin: 0;
  tab-size: 2;
}

.placeholder { color: #333; font-style: italic; }

/* ---- Syntax highlighting ---- */
.json-key    { color: #8ea0ff; }
.json-string { color: #79c7a0; }
.json-number { color: #e5a96a; }
.json-bool   { color: #c788e0; }
.json-null   { color: #c788e0; }
.json-error  { color: #ff6060; }

/* ---- Mobile ---- */
@media (max-width: 700px) {
  html, body { overflow: auto; height: auto; }

  .container {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 100vh;
  }

  .panel { height: auto; overflow: visible; border-right: none; border-bottom: 1px solid rgba(70,80,150,0.18); }
  .panel-body { overflow: visible; }

  .output-side { height: 60vh; }
}