:root {
  --bg: #090d16;
  --card-bg: #111827;
  --panel-bg: #1f2937;
  --accent: #06b6d4;
  --accent-hover: #0891b2;
  --success: #10b981;
  --text: #f9fafb;
  --text-muted: #9ca3af;
  --border: #374151;
  --console-bg: #030712;
  --kw-color: #38bdf8;
}

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

body {
  font-family: 'Plus Jakarta Sans', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 0.85rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.brand-logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid rgba(6, 182, 212, 0.4);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.2);
}

.brand-badge {
  background: linear-gradient(135deg, var(--accent), #3b82f6);
  color: #ffffff;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  font-size: 0.8rem;
  letter-spacing: 0.5px;
}

h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.header-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

select, button, .btn-learn {
  font-family: inherit;
  font-size: 0.85rem;
  border-radius: 8px;
  padding: 0.45rem 0.85rem;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  text-decoration: none;
}

select {
  background: var(--panel-bg);
  color: var(--text);
  border: 1px solid var(--border);
  outline: none;
}

.btn-learn {
  background: var(--panel-bg);
  color: #a5b4fc;
  border: 1px solid var(--border);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.btn-learn:hover {
  background: #312e81;
  color: white;
  border-color: #6366f1;
}

.btn-run {
  background: linear-gradient(135deg, #10b981, #059669);
  color: white;
  border: none;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}

.btn-run:hover {
  background: linear-gradient(135deg, #059669, #047857);
  transform: translateY(-1px);
}

.btn-clear {
  background: var(--panel-bg);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-clear:hover {
  color: var(--text);
  background: var(--border);
}

.suggestions-bar {
  background: #0d1322;
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
}

.suggestions-bar::-webkit-scrollbar {
  height: 4px;
}

.suggestions-bar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.sug-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.kw-chip {
  background: var(--panel-bg);
  color: var(--kw-color);
  font-family: 'Fira Code', monospace;
  font-size: 0.8rem;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
  transition: all 0.15s;
}

.kw-chip:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding: 1rem 1.25rem;
  min-height: 0;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.card-header {
  background: var(--panel-bg);
  padding: 0.6rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}

.editor-wrapper {
  flex: 1;
  position: relative;
  min-height: 320px;
  background: var(--console-bg);
  border-radius: 0 0 12px 12px;
}

#codeEditor, #highlighting, #highlightingContent, #highlighting * {
  margin: 0;
  font-family: 'Fira Code', monospace !important;
  font-size: 0.95rem !important;
  line-height: 1.6 !important;
  font-weight: 400 !important;
  letter-spacing: 0px !important;
  word-spacing: 0px !important;
  tab-size: 2;
  white-space: pre-wrap;
  word-wrap: break-word;
  word-break: break-all;
  box-sizing: border-box;
}

#codeEditor, #highlighting {
  padding: 1rem;
  border: none;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  overflow: auto;
}

#codeEditor {
  color: transparent;
  background: transparent;
  caret-color: var(--text);
  resize: none;
  outline: none;
  z-index: 1;
}

#highlighting {
  z-index: 0;
  pointer-events: none;
  color: #f3f4f6;
}

/* Syntax Highlighting Colors - uniform font-weight: 400 for perfect 1-to-1 caret alignment */
.syn-keyword { color: var(--kw-color); }
.syn-boolean { color: #f472b6; }
.syn-string { color: #34d399; }
.syn-number { color: #fbbf24; }
.syn-operator { color: #c084fc; }
.syn-comment { color: #6b7280; font-style: italic !important; }

#consoleOutput {
  flex: 1;
  background: var(--console-bg);
  color: #10b981;
  font-family: 'Fira Code', monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  padding: 1rem;
  overflow-y: auto;
  white-space: pre-wrap;
  min-height: 320px;
}

.console-input-row {
  display: none;
  background: var(--panel-bg);
  border-top: 1px solid var(--border);
  padding: 0.5rem 1rem;
  align-items: center;
  gap: 0.5rem;
}

.console-input-row.active {
  display: flex;
}

.console-input-row input {
  flex: 1;
  background: var(--console-bg);
  border: 1px solid var(--border);
  color: white;
  font-family: 'Fira Code', monospace;
  padding: 0.45rem 0.75rem;
  border-radius: 6px;
  outline: none;
  font-size: 0.9rem;
}

footer {
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  padding: 0.85rem 1.25rem;
  display: flex;
  justify-content: center;
  align-items: center;
}

.footer-text {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  transition: all 0.2s ease-in-out;
}

.footer-link:hover {
  background: #1e293b;
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.2);
}

.footer-logo {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--accent);
}

/* Mobile Responsive Breakpoint */
@media (max-width: 768px) {
  header { padding: 0.75rem 1rem; }
  h1 { font-size: 1.1rem; }
  main {
    grid-template-columns: 1fr;
    padding: 0.75rem 1rem;
    height: auto;
  }
  .editor-wrapper, #consoleOutput { min-height: 240px; }
  .header-controls { width: 100%; justify-content: space-between; }
  select { flex: 1; }
}