/* ═══════════════════════════════════════════════════════════════════
   RULang IDE — style.css  (Redesigned)
   Modern Developer Tool / IDE Aesthetic
   Roman Urdu Programming Language — Compiler Construction
═══════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=JetBrains+Mono:ital,wght@0,300;0,400;0,500;0,600;1,400&family=DM+Sans:wght@300;400;500;600&display=swap');

/* ──────────────────────── CSS Variables ─────────────────────────── */
:root {
  --bg-void:          #07090f;
  --bg-base:          #0d1117;
  --bg-panel:         #10161f;
  --bg-panel-alt:     #131a25;
  --bg-elevated:      #161d2b;
  --bg-hover:         #1a2338;
  --bg-active:        #1e2a40;
  --bg-selection:     rgba(99,137,255,0.18);

  --accent-primary:   #6389ff;
  --accent-bright:    #839bff;
  --accent-dim:       #3b5099;
  --accent-glow:      rgba(99,137,255,0.18);
  --accent-glow-soft: rgba(99,137,255,0.07);

  --cyan:             #38bdf8;
  --cyan-dim:         #164e63;
  --cyan-glow:        rgba(56,189,248,0.12);

  --purple:           #a78bfa;
  --purple-dim:       #4c3888;

  --green:            #34d399;
  --green-dim:        #065f46;
  --green-glow:       rgba(52,211,153,0.12);

  --amber:            #fbbf24;
  --amber-dim:        #78350f;

  --red-err:          #f87171;
  --red-dim:          #7f1d1d;
  --red-glow:         rgba(248,113,113,0.1);

  --orange:           #fb923c;

  --text-primary:     #e2e8f0;
  --text-secondary:   #94a3b8;
  --text-dim:         #475569;
  --text-muted:       #2d3748;
  --text-code:        #c9d1d9;

  --border:           rgba(255,255,255,0.06);
  --border-bright:    rgba(255,255,255,0.11);
  --border-accent:    rgba(99,137,255,0.32);

  --font-ui:          'DM Sans', system-ui, sans-serif;
  --font-display:     'Syne', sans-serif;
  --font-mono:        'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --explorer-w:       240px;
  --console-w:        320px;
  --header-h:         52px;
  --statusbar-h:      26px;
  --panel-header-h:   38px;

  --radius-sm:        4px;
  --radius-md:        8px;
  --radius-lg:        12px;
  --transition:       0.2s ease;
}

/* ──────────────────────── Themes ───────────────────────────────── */
/* Light Theme */
.theme-light {
  --bg-void:          #f8fafc;
  --bg-base:          #ffffff;
  --bg-panel:         #f1f5f9;
  --bg-panel-alt:     #e2e8f0;
  --bg-elevated:      #ffffff;
  --bg-hover:         #e2e8f0;
  --bg-active:        #cbd5e1;
  --bg-selection:     rgba(59,130,246,0.1);

  --accent-primary:   #3b82f6;
  --accent-bright:    #60a5fa;
  --accent-dim:       #1d4ed8;
  --accent-glow:      rgba(59,130,246,0.1);
  --accent-glow-soft: rgba(59,130,246,0.05);

  --cyan:             #06b6d4;
  --cyan-dim:         #0891b2;
  --cyan-glow:        rgba(6,182,212,0.1);

  --purple:           #8b5cf6;
  --purple-dim:       #7c3aed;

  --green:            #10b981;
  --green-dim:        #059669;
  --green-glow:       rgba(16,185,129,0.1);

  --amber:            #f59e0b;
  --amber-dim:        #d97706;

  --red-err:          #ef4444;
  --red-dim:          #dc2626;
  --red-glow:         rgba(239,68,68,0.1);

  --orange:           #f97316;

  --text-primary:     #1e293b;
  --text-secondary:   #475569;
  --text-dim:         #64748b;
  --text-muted:       #94a3b8;
  --text-code:        #334155;

  --border:           rgba(0,0,0,0.08);
  --border-bright:    rgba(0,0,0,0.12);
  --border-accent:    rgba(59,130,246,0.2);
}

/* Monokai Theme */
.theme-monokai {
  --bg-void:          #272822;
  --bg-base:          #272822;
  --bg-panel:         #3e3d32;
  --bg-panel-alt:     #49483e;
  --bg-elevated:      #49483e;
  --bg-hover:         #75715e;
  --bg-active:        #75715e;
  --bg-selection:     rgba(249,38,114,0.2);

  --accent-primary:   #f92672;
  --accent-bright:    #fd971f;
  --accent-dim:       #a6e22e;
  --accent-glow:      rgba(249,38,114,0.2);
  --accent-glow-soft: rgba(249,38,114,0.1);

  --cyan:             #66d9ef;
  --cyan-dim:         #66d9ef;
  --cyan-glow:        rgba(102,217,239,0.2);

  --purple:           #ae81ff;
  --purple-dim:       #ae81ff;

  --green:            #a6e22e;
  --green-dim:        #a6e22e;
  --green-glow:       rgba(166,226,46,0.2);

  --amber:            #fd971f;
  --amber-dim:        #fd971f;

  --red-err:          #f92672;
  --red-dim:          #f92672;
  --red-glow:         rgba(249,38,114,0.2);

  --orange:           #fd971f;

  --text-primary:     #f8f8f2;
  --text-secondary:   #f8f8f0;
  --text-dim:         #75715e;
  --text-muted:       #49483e;
  --text-code:        #f8f8f2;

  --border:           rgba(255,255,255,0.1);
  --border-bright:    rgba(255,255,255,0.2);
  --border-accent:    rgba(249,38,114,0.3);
}

/* GitHub Theme */
.theme-github {
  --bg-void:          #ffffff;
  --bg-base:          #ffffff;
  --bg-panel:         #f6f8fa;
  --bg-panel-alt:     #f6f8fa;
  --bg-elevated:      #ffffff;
  --bg-hover:         #f6f8fa;
  --bg-active:        #f6f8fa;
  --bg-selection:     rgba(3,102,214,0.1);

  --accent-primary:   #0366d6;
  --accent-bright:    #0366d6;
  --accent-dim:       #0366d6;
  --accent-glow:      rgba(3,102,214,0.1);
  --accent-glow-soft: rgba(3,102,214,0.05);

  --cyan:             #005cc5;
  --cyan-dim:         #005cc5;
  --cyan-glow:        rgba(0,92,197,0.1);

  --purple:           #6f42c1;
  --purple-dim:       #6f42c1;

  --green:            #28a745;
  --green-dim:        #28a745;
  --green-glow:       rgba(40,167,69,0.1);

  --amber:            #ffd33d;
  --amber-dim:        #ffd33d;

  --red-err:          #d73a49;
  --red-dim:          #d73a49;
  --red-glow:         rgba(215,58,73,0.1);

  --orange:           #e36209;

  --text-primary:     #24292e;
  --text-secondary:   #586069;
  --text-dim:         #959da5;
  --text-muted:       #d1d5db;
  --text-code:        #24292e;

  --border:           rgba(0,0,0,0.08);
  --border-bright:    rgba(0,0,0,0.12);
  --border-accent:    rgba(3,102,214,0.2);
}

/* Dracula Theme */
.theme-dracula {
  --bg-void:          #282a36;
  --bg-base:          #282a36;
  --bg-panel:         #44475a;
  --bg-panel-alt:     #44475a;
  --bg-elevated:      #44475a;
  --bg-hover:         #6272a4;
  --bg-active:        #6272a4;
  --bg-selection:     rgba(189,147,249,0.2);

  --accent-primary:   #bd93f9;
  --accent-bright:    #ff79c6;
  --accent-dim:       #50fa7b;
  --accent-glow:      rgba(189,147,249,0.2);
  --accent-glow-soft: rgba(189,147,249,0.1);

  --cyan:             #8be9fd;
  --cyan-dim:         #8be9fd;
  --cyan-glow:        rgba(139,233,253,0.2);

  --purple:           #bd93f9;
  --purple-dim:       #bd93f9;

  --green:            #50fa7b;
  --green-dim:        #50fa7b;
  --green-glow:       rgba(80,250,123,0.2);

  --amber:            #f1fa8c;
  --amber-dim:        #f1fa8c;

  --red-err:          #ff5555;
  --red-dim:          #ff5555;
  --red-glow:         rgba(255,85,85,0.2);

  --orange:           #ffb86c;

  --text-primary:     #f8f8f2;
  --text-secondary:   #f8f8f2;
  --text-dim:         #6272a4;
  --text-muted:       #44475a;
  --text-code:        #f8f8f2;

  --border:           rgba(255,255,255,0.1);
  --border-bright:    rgba(255,255,255,0.2);
  --border-accent:    rgba(189,147,249,0.3);
}

/* ──────────────────────── Syntax Highlighting ─────────────────── */
/* Base syntax colors - will be overridden by themes */
.syntax-keyword    { color: var(--accent-primary); font-weight: 600; }
.syntax-identifier { color: var(--text-primary); }
.syntax-number     { color: var(--amber); }
.syntax-string     { color: var(--green); }
.syntax-comment    { color: var(--text-dim); font-style: italic; }
.syntax-operator   { color: var(--cyan); }
.syntax-builtin    { color: var(--purple); font-weight: 500; }
.syntax-function   { color: var(--green); font-weight: 500; }
.syntax-variable   { color: var(--orange); }

/* Theme-specific syntax overrides */
.theme-light .syntax-keyword    { color: #0000ff; }
.theme-light .syntax-identifier { color: #000000; }
.theme-light .syntax-number     { color: #09885a; }
.theme-light .syntax-string     { color: #008000; }
.theme-light .syntax-comment    { color: #008000; font-style: italic; }
.theme-light .syntax-operator   { color: #000000; }
.theme-light .syntax-builtin    { color: #795e26; }
.theme-light .syntax-function   { color: #795e26; }
.theme-light .syntax-variable   { color: #9b27af; }

.theme-monokai .syntax-keyword    { color: #f92672; }
.theme-monokai .syntax-identifier { color: #f8f8f2; }
.theme-monokai .syntax-number     { color: #ae81ff; }
.theme-monokai .syntax-string     { color: #e6db74; }
.theme-monokai .syntax-comment    { color: #75715e; }
.theme-monokai .syntax-operator   { color: #f92672; }
.theme-monokai .syntax-builtin    { color: #a6e22e; }
.theme-monokai .syntax-function   { color: #a6e22e; }
.theme-monokai .syntax-variable   { color: #fd971f; }

.theme-github .syntax-keyword    { color: #d73a49; }
.theme-github .syntax-identifier { color: #24292e; }
.theme-github .syntax-number     { color: #005cc5; }
.theme-github .syntax-string     { color: #032f62; }
.theme-github .syntax-comment    { color: #6a737d; }
.theme-github .syntax-operator   { color: #d73a49; }
.theme-github .syntax-builtin    { color: #6f42c1; }
.theme-github .syntax-function   { color: #6f42c1; }
.theme-github .syntax-variable   { color: #e36209; }

.theme-dracula .syntax-keyword    { color: #ff79c6; }
.theme-dracula .syntax-identifier { color: #f8f8f2; }
.theme-dracula .syntax-number     { color: #bd93f9; }
.theme-dracula .syntax-string     { color: #f1fa8c; }
.theme-dracula .syntax-comment    { color: #6272a4; }
.theme-dracula .syntax-operator   { color: #ff79c6; }
.theme-dracula .syntax-builtin    { color: #50fa7b; }
.theme-dracula .syntax-function   { color: #50fa7b; }
.theme-dracula .syntax-variable   { color: #ffb86c; }

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

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg-void);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 13px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Remove old CRT overlays */
.scanlines, .crt-flicker { display: none; }

/* ──────────────────────── Scrollbars ───────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-dim); }

/* ──────────────────────── Header ───────────────────────────────── */
.menubar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 14px;
  z-index: 100;
}

.menubar::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--accent-primary) 30%, var(--cyan) 70%, transparent 100%);
  opacity: 0.5;
}

/* ── Logo */
.menubar__logo {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
  user-select: none;
}

.logo-bracket { display: none; }

.logo-text {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  color: var(--accent-bright);
  letter-spacing: -0.5px;
}

.logo-lang {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 400;
  color: var(--cyan);
  letter-spacing: -0.5px;
}

.logo-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 0.3px;
  margin-left: 6px;
  padding: 2px 9px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 99px;
}

/* ── Action buttons */
.menubar__actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
}

.btn {
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.2px;
  padding: 7px 15px;
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
  outline: none;
}

.btn:active { transform: scale(0.97); }
.btn:hover  { color: var(--text-primary); }
.btn:focus  { outline: 2px solid var(--accent-primary); outline-offset: 2px; }

/* Ensure buttons are always interactive */
.btn, .btn-small {
  position: relative;
  z-index: 101;
  pointer-events: auto !important;
}

.btn-icon { font-size: 13px; line-height: 1; }

/* Run — primary CTA */
.btn--run {
  color: #fff;
  background: linear-gradient(135deg, #5b7fff, #4060d4);
  border-color: var(--accent-bright);
  font-weight: 600;
}
.btn--run:hover {
  background: linear-gradient(135deg, var(--accent-bright), var(--accent-primary));
  box-shadow: 0 0 22px rgba(99,137,255,0.35), 0 4px 12px rgba(99,137,255,0.2);
  transform: translateY(-1px);
}
.btn--run:active { transform: scale(0.97) translateY(0); }

/* Clear */
.btn--clear {
  color: var(--amber);
  border-color: rgba(251,191,36,0.22);
}
.btn--clear:hover {
  background: rgba(251,191,36,0.07);
  border-color: rgba(251,191,36,0.5);
  box-shadow: 0 0 14px rgba(251,191,36,0.1);
}

/* Python */
.btn--python {
  color: var(--cyan);
  border-color: rgba(56,189,248,0.22);
}
.btn--python:hover {
  background: rgba(56,189,248,0.07);
  border-color: rgba(56,189,248,0.5);
  box-shadow: 0 0 14px rgba(56,189,248,0.12);
}

/* Help */
.btn--help {
  color: var(--text-dim);
  border-color: var(--border);
}
.btn--help:hover {
  color: var(--text-primary);
  border-color: var(--border-bright);
  background: var(--bg-hover);
}

/* File operations */
.btn--file {
  color: var(--text-dim);
  border-color: var(--border);
}
.btn--file:hover {
  color: var(--text-primary);
  border-color: var(--border-bright);
  background: var(--bg-hover);
}

/* Theme selector */
.theme-selector {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 6px 10px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-left: 8px;
}
.theme-selector:hover {
  border-color: var(--accent-primary);
  background: var(--bg-hover);
}
.theme-selector:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}
.theme-selector option {
  background: var(--bg-panel);
  color: var(--text-primary);
}

/* ── Status chip */
.menubar__status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  flex-shrink: 0;
  padding: 5px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.status-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
  animation: pulse-dot 2.5s ease-in-out infinite;
  flex-shrink: 0;
}

.status-dot.running {
  background: var(--amber);
  box-shadow: 0 0 8px var(--amber);
  animation: pulse-fast 0.6s ease-in-out infinite;
}

.status-dot.error {
  background: var(--red-err);
  box-shadow: 0 0 8px var(--red-err);
  animation: none;
}

@keyframes pulse-dot  { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.45;transform:scale(.82)} }
@keyframes pulse-fast { 0%,100%{opacity:1;transform:scale(1.1)} 50%{opacity:.55;transform:scale(.88)} }

/* ──────────────────────── IDE Layout ───────────────────────────── */
.ide-layout {
  position: fixed;
  top: var(--header-h);
  bottom: var(--statusbar-h);
  left: 0; right: 0;
  display: flex;
  overflow: hidden;
}

/* ──────────────────────── Panels ───────────────────────────────── */
.panel {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  overflow: hidden;
  background: var(--bg-panel);
}

.panel--explorer {
  width: var(--explorer-w);
  min-width: 180px;
  flex-shrink: 0;
  transition: width 0.22s cubic-bezier(0.4,0,0.2,1);
  background: var(--bg-base);
}

.panel--explorer.collapsed {
  width: 36px;
  min-width: 36px;
}

.panel--editor {
  flex: 1;
  overflow: hidden;
  background: var(--bg-base);
}

.panel--console {
  width: var(--console-w);
  min-width: 260px;
  flex-shrink: 0;
  border-right: none;
  border-left: 1px solid var(--border);
}

/* ── Panel header */
.panel__header {
  height: var(--panel-header-h);
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 8px;
  font-family: var(--font-ui);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.7px;
  color: var(--text-dim);
  text-transform: uppercase;
  flex-shrink: 0;
}

.panel__header--sub {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.panel__icon { font-size: 13px; opacity: 0.7; }

.panel__collapse {
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  cursor: pointer;
  font-size: 11px;
  padding: 3px 6px;
  transition: all var(--transition);
  line-height: 1;
}
.panel__collapse:hover {
  color: var(--text-primary);
  border-color: var(--border-bright);
  background: var(--bg-hover);
}

/* ──────────────────────── File Explorer ────────────────────────── */
.explorer-section {
  padding: 8px 0;
  overflow-y: auto;
  flex: 1;
}

.explorer-label {
  padding: 6px 12px 8px;
  color: var(--accent-primary);
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  opacity: 0.85;
}

.file-group { margin-bottom: 4px; }

.file-group__label {
  padding: 5px 12px;
  color: var(--text-dim);
  font-size: 11px;
  font-weight: 500;
}

.file-list { list-style: none; }

.file-item {
  padding: 6px 12px 6px 26px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
  transition: all var(--transition);
  border-left: 2px solid transparent;
  position: relative;
}

.file-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.file-item.active {
  background: var(--bg-active);
  color: var(--accent-bright);
  border-left-color: var(--accent-primary);
}

.file-item.active::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-glow-soft);
  pointer-events: none;
}

.file-icon { font-size: 12px; opacity: 0.75; }

/* ──────────────────────── Language Reference ───────────────────── */
.lang-ref {
  border-top: 1px solid var(--border);
  padding: 10px 10px 14px;
  flex-shrink: 0;
  background: var(--bg-void);
}

.lang-ref__title {
  color: var(--text-dim);
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.lang-ref__row {
  display: flex;
  gap: 8px;
  align-items: baseline;
  padding: 2.5px 4px;
  font-size: 11px;
  color: var(--text-dim);
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.lang-ref__row:hover { background: var(--bg-hover); }

.lang-ref__row .kw {
  color: var(--purple);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 11px;
  min-width: 70px;
  flex-shrink: 0;
}

/* ──────────────────────── Editor Tabs ─────────────────────────── */
.editor-tabs {
  display: flex;
  margin-left: 4px;
  flex: 1;
}

.tab {
  padding: 0 16px;
  height: var(--panel-header-h);
  display: flex;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.3px;
  color: var(--text-dim);
  border-right: 1px solid var(--border);
  transition: all var(--transition);
  position: relative;
  white-space: nowrap;
  user-select: none;
}

.tab:hover {
  color: var(--text-secondary);
  background: var(--bg-hover);
}

.tab.active {
  color: var(--accent-bright);
  background: var(--bg-base);
}

.tab.active::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--cyan));
  border-radius: 2px 2px 0 0;
}

.tab--demo {
  background: linear-gradient(135deg, var(--amber), var(--orange));
  color: #fff !important;
  font-weight: 700 !important;
  border: none !important;
  margin-left: 4px;
  padding: 0 12px !important;
}

.tab--demo:hover {
  background: linear-gradient(135deg, var(--orange), var(--amber));
  box-shadow: 0 0 12px rgba(251, 146, 60, 0.4);
}

.editor-info {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  flex-shrink: 0;
  padding-right: 6px;
}

.lang-badge {
  background: rgba(99,137,255,0.1);
  border: 1px solid var(--border-accent);
  color: var(--accent-bright);
  padding: 2px 9px;
  border-radius: 99px;
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

#editor-filename {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  padding: 2px 8px;
  background: var(--bg-base);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

/* ──────────────────────── Tab Content ─────────────────────────── */
.tab-content {
  display: none;
  flex: 1;
  overflow: hidden;
  flex-direction: column;
}
.tab-content.active {
  display: flex;
  overflow: hidden;
}

/* Demo tab needs special handling for scrolling content */
#tab-demo {
  overflow: hidden;
}
#tab-demo .demo-viewer {
  overflow: hidden;
}
#tab-demo .demo-content {
  overflow-y: auto;
  flex: 1;
}

/* ──────────────────────── Code Editor ─────────────────────────── */
.editor-wrapper {
  display: flex;
  flex: 1;
  overflow: hidden;
  background: var(--bg-void);
}

.line-numbers {
  width: 50px;
  padding: 14px 10px 14px 0;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-muted);
  background: var(--bg-base);
  border-right: 1px solid var(--border);
  user-select: none;
  white-space: pre;
  overflow: hidden;
  flex-shrink: 0;
}

.code-editor-container {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.syntax-highlight {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  white-space: pre;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
  color: var(--text-code); /* Show default text color for non-token parts */
}

.syntax-highlight * {
  /* color: inherit !important; */ /* Remove or comment this out to allow span colors to work */
}

.code-editor {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px;
  background: transparent;
  color: transparent; /* Make textarea text transparent */
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  border: none;
  outline: none;
  resize: none;
  tab-size: 4;
  white-space: pre;
  overflow: auto;
  caret-color: var(--accent-bright); /* Keep caret visible */
  z-index: 2;
}

.code-editor::placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.code-editor::selection {
  background: var(--bg-selection);
}

.code-editor:focus {
  box-shadow: inset 3px 0 0 var(--accent-primary);
}

/* ──────────────────────── AST Viewer ──────────────────────────── */
.ast-viewer {
  flex: 1;
  overflow: auto;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-void);
}

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

.ast-node__label {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-left: 2px solid;
  margin-bottom: 2px;
  cursor: pointer;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: all var(--transition);
  font-size: 12px;
}

.ast-node__label:hover {
  background: var(--bg-hover);
  padding-left: 14px;
}

.ast-node--program > .ast-node__label  { border-color: var(--amber);  color: var(--amber);  }
.ast-node--var-decl > .ast-node__label { border-color: var(--cyan);   color: var(--cyan);   }
.ast-node--print > .ast-node__label    { border-color: var(--green);  color: var(--green);  }
.ast-node--if > .ast-node__label       { border-color: var(--orange); color: var(--orange); }
.ast-node--expr > .ast-node__label     { border-color: var(--text-dim); color: var(--text-secondary); }
.ast-node--literal > .ast-node__label  { border-color: var(--purple-dim); color: var(--purple); }

.ast-children {
  margin-left: 20px;
  border-left: 1px solid var(--border-bright);
  padding-left: 8px;
  margin-top: 1px;
  margin-bottom: 1px;
}

.ast-toggle-row {
  display: flex;
  gap: 8px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
}

.ast-toggle-btn {
  padding: 6px 14px;
  background: var(--bg-panel);
  border: 1px solid var(--border-bright);
  color: var(--text-secondary);
  font-size: 12px;
  font-family: var(--font-ui);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.ast-toggle-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.ast-toggle-btn.active {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

.ast-view-container {
  flex: 1;
  overflow: auto;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
}

/* Parse Tree Styles */
.parse-tree-viewer {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-bright);
}

.parse-tree-title {
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.parse-node {
  margin: 3px 0;
  display: flex;
  flex-direction: column;
}

.parse-node__line {
  display: flex;
  align-items: center;
  gap: 4px;
}

.parse-node__rule {
  font-size: 11px;
  color: var(--text-dim);
  margin-left: 20px;
  padding: 2px 8px;
  background: var(--bg-panel-alt);
  border-radius: 3px;
}

.parse-token {
  padding: 2px 8px;
  border-radius: 3px;
  font-size: 11px;
  font-family: var(--font-mono);
}

.parse-token--keyword { background: var(--purple-dim); color: var(--purple); }
.parse-token--number { background: var(--cyan-dim); color: var(--cyan); }
.parse-token--string { background: var(--green-dim); color: var(--green); }
.parse-token--identifier { background: var(--accent-dim); color: var(--accent-bright); }
.parse-token--operator { background: var(--amber-dim); color: var(--amber); }

/* ──────────────────────── NFA/DFA Viewer ───────────────────────── */
.nfa-dfa-viewer {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-void);
}

.nfa-dfa-content {
  flex: 1;
  overflow: auto;
  padding: 16px;
}

.nfa-diagram {
  background: var(--bg-panel);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 16px;
}

.nfa-state-diagram {
  display: flex;
  align-items: center;
  gap: 40px;
  justify-content: center;
  padding: 20px;
  min-height: 120px;
}

.state-circle {
  width: 70px;
  height: 70px;
  border: 3px solid var(--accent-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-bright);
  position: relative;
  transition: all var(--transition);
}

.state-circle.start {
  background: linear-gradient(135deg, var(--bg-panel) 0%, var(--bg-elevated) 100%);
}

.state-circle.accept {
  border-color: var(--green);
  box-shadow: 0 0 12px var(--green-glow);
}

.state-circle.accept::after {
  content: '';
  position: absolute;
  width: 60px;
  height: 60px;
  border: 2px solid var(--green);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.state-circle.active {
  background: var(--accent-primary);
  color: white;
  box-shadow: 0 0 20px var(--accent-glow);
}

.transition-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.transition-line {
  width: 50px;
  height: 3px;
  background: var(--text-dim);
  position: relative;
}

.transition-line::after {
  content: '';
  position: absolute;
  right: -6px;
  top: -4px;
  border: 5px solid transparent;
  border-left-color: var(--text-dim);
}

.transition-label {
  font-size: 11px;
  color: var(--amber);
  font-family: var(--font-mono);
  background: var(--bg-panel);
  padding: 2px 6px;
  border-radius: 3px;
}

.nfa-legend {
  display: flex;
  gap: 16px;
  padding: 12px 16px;
  background: var(--bg-panel-alt);
  border-radius: var(--radius-sm);
  font-size: 11px;
  color: var(--text-secondary);
}

.nfa-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nfa-legend-item::before {
  content: '';
  width: 14px;
  height: 14px;
  border: 2px solid;
  border-radius: 50%;
}

.nfa-legend-item.start::before { border-color: var(--accent-primary); }
.nfa-legend-item.accept::before { border-color: var(--green); }
.nfa-legend-item.normal::before { border-color: var(--text-dim); }

.nfa-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
}

.nfa-table th {
  background: var(--bg-panel);
  color: var(--text-dim);
  padding: 8px 10px;
  text-align: center;
  border: 1px solid var(--border-bright);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
}

.nfa-table td {
  padding: 6px 10px;
  border: 1px solid var(--border);
  text-align: center;
  color: var(--text-secondary);
}

.nfa-table td:first-child {
  background: var(--bg-panel-alt);
  color: var(--accent-bright);
  font-weight: 500;
}

/* ──────────────────────── Tokens Viewer ───────────────────────── */
.tokens-viewer {
  flex: 1;
  overflow: auto;
  padding: 12px;
  background: var(--bg-void);
}

.token-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 12px;
}

.token-table th {
  background: var(--bg-panel);
  color: var(--text-dim);
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-bright);
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  position: sticky;
  top: 0;
  z-index: 1;
}

.token-table td {
  padding: 5px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  transition: background var(--transition);
}

.token-table tr:hover td { background: var(--bg-hover); }

.tok-type { color: var(--accent-bright); }
.tok-kw   { color: var(--purple); font-weight: 500; }
.tok-num  { color: var(--cyan); }
.tok-str  { color: var(--green); }
.tok-op   { color: var(--amber); }
.tok-id   { color: var(--text-primary); }

/* ──────────────────────── Python Viewer ───────────────────────── */
.python-viewer {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  background: var(--bg-void);
}

.python-header {
  background: var(--bg-panel);
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 500;
  flex-shrink: 0;
}

.python-code {
  flex: 1;
  overflow: auto;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: #c9d1d9;
  white-space: pre;
  background: var(--bg-void);
}

/* ──────────────────────── Small Buttons ───────────────────────── */
.btn-small {
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 500;
  padding: 4px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.btn-small:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--accent-dim);
}

/* ──────────────────────── Console ─────────────────────────────── */
.console-controls { margin-left: auto; }

.console-output {
  flex: 1;
  overflow-y: auto;
  padding: 12px 14px;
  min-height: 0;
}
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.8;
  background: var(--bg-void);
}

.console-welcome { margin-bottom: 14px; }

.welcome-art {
  font-family: var(--font-mono);
  font-size: 6.5px;
  line-height: 1.3;
  color: var(--accent-dim);
  white-space: pre;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
  opacity: 0.55;
}

.welcome-text { font-size: 12px; line-height: 1.9; }

/* Console color aliases — map old retro names to new palette */
.con-green  { color: var(--green); }
.con-dim    { color: var(--text-dim); }
.con-yellow { color: var(--amber); }
.con-red    { color: var(--red-err); }
.con-cyan   { color: var(--cyan); }
.con-amber  { color: var(--amber); }

.console-line {
  display: block;
  padding: 1px 0;
  animation: lineIn 0.12s ease;
}

.console-line--output  { color: var(--text-primary); }
.console-line--info    { color: var(--cyan); }
.console-line--success { color: var(--green); }
.console-line--warn    { color: var(--amber); }

.console-line--error {
  color: var(--red-err);
  background: rgba(248,113,113,0.06);
  padding: 4px 8px;
  border-left: 2px solid var(--red-err);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 3px 0;
}

.console-line--sep {
  color: var(--border-bright);
  letter-spacing: 2px;
  opacity: 0.45;
}

.console-line--system {
  color: var(--text-dim);
  font-style: italic;
  font-size: 11px;
}

.console-prompt {
  color: var(--accent-dim);
  user-select: none;
  margin-right: 4px;
}

@keyframes lineIn {
  from { opacity: 0; transform: translateX(-5px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ──────────────────────── Symbol Table ────────────────────────── */
.symbol-table-wrapper {
  overflow-y: auto;
  max-height: 180px;
  flex-shrink: 0;
}

.symbol-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 11.5px;
}

.symbol-table th {
  background: var(--bg-panel);
  color: var(--text-dim);
  padding: 6px 10px;
  text-align: left;
  border-bottom: 1px solid var(--border-bright);
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  position: sticky;
  top: 0;
}

.symbol-table td {
  padding: 5px 10px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  transition: background var(--transition);
}

.symbol-table tr:hover td { background: var(--bg-hover); }

.symbol-table td:nth-child(1) { color: var(--text-primary); }
.symbol-table td:nth-child(2) { color: var(--cyan); font-weight: 500; }
.symbol-table td:nth-child(3) { color: var(--text-dim); font-size: 10.5px; }

.empty-row td {
  color: var(--text-muted) !important;
  text-align: center;
  font-family: var(--font-ui);
  font-style: italic;
  font-size: 11px;
}

/* ──────────────────────── Pipeline Visualization ────────────────── */
.pipeline-viz {
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  padding: 10px 12px;
  flex-shrink: 0;
}

.pipeline-header {
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.pipeline-layers {
  display: flex;
  gap: 3px;
  justify-content: space-between;
}

.pipeline-layer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 6px 4px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  flex: 1;
  min-width: 0;
  transition: all 0.3s ease;
}

.pipeline-layer.active {
  background: rgba(99, 137, 255, 0.15);
  border-color: var(--accent-primary);
  box-shadow: 0 0 10px rgba(99, 137, 255, 0.2);
}

.pipeline-layer.success {
  background: rgba(52, 211, 153, 0.1);
  border-color: var(--green);
}

.pipeline-layer.error {
  background: rgba(248, 113, 113, 0.1);
  border-color: var(--red-err);
}

.pipeline-layer__num {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-void);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
}

.pipeline-layer.active .pipeline-layer__num,
.pipeline-layer.success .pipeline-layer__num {
  background: var(--accent-primary);
  color: white;
}

.pipeline-layer.error .pipeline-layer__num {
  background: var(--red-err);
  color: white;
}

.pipeline-layer__name {
  font-family: var(--font-ui);
  font-size: 9px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.pipeline-layer.active .pipeline-layer__name,
.pipeline-layer.success .pipeline-layer__name {
  color: var(--text-primary);
}

.pipeline-layer__status {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
}

.pipeline-layer.active .pipeline-layer__status {
  background: var(--amber);
  animation: pulse-status 0.8s ease-in-out infinite;
}

.pipeline-layer.success .pipeline-layer__status {
  background: var(--green);
}

.pipeline-layer.error .pipeline-layer__status {
  background: var(--red-err);
}

@keyframes pulse-status {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

/* ──────────────────────── Layer Header ──────────────────────────── */
.layer-header {
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  flex-shrink: 0;
}

.layer-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-bright);
  margin-bottom: 4px;
}

.layer-icon {
  font-size: 16px;
  opacity: 0.9;
}

.layer-desc {
  font-family: var(--font-ui);
  font-size: 11px;
  color: var(--text-dim);
}

/* ──────────────────────── Semantic Viewer ───────────────────────── */
.semantic-viewer {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  background: var(--bg-void);
}

.semantic-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.semantic-section {
  margin-bottom: 16px;
}

.semantic-section__title {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--bg-panel);
  border-left: 3px solid var(--amber);
  color: var(--amber);
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.semantic-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 12px;
}

.semantic-table th {
  background: var(--bg-elevated);
  color: var(--text-dim);
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-bright);
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

.semantic-table td {
  padding: 6px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}

.semantic-table tr:hover td {
  background: var(--bg-hover);
}

.check-pass { color: var(--green); }
.check-warn { color: var(--amber); }
.check-fail { color: var(--red-err); }

/* ──────────────────────── IR Viewer ─────────────────────────────── */
.ir-viewer {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  background: var(--bg-void);
}

.ir-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.ir-code {
  background: var(--bg-base);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  line-height: 1.8;
}

.ir-line {
  display: flex;
  gap: 16px;
  padding: 3px 0;
  border-bottom: 1px solid var(--border);
}

.ir-label {
  color: var(--accent-bright);
  min-width: 60px;
  flex-shrink: 0;
}

.ir-opcode {
  color: var(--purple);
  min-width: 100px;
  flex-shrink: 0;
  font-weight: 500;
}

.ir-args {
  color: var(--cyan);
  flex: 1;
}

.ir-comment {
  color: var(--text-muted);
  font-style: italic;
}

/* ──────────────────────── Optimize Viewer ──────────────────────── */
.optimize-viewer {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  background: var(--bg-void);
}

.optimize-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.optimize-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.optimize-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.optimize-panel__header {
  padding: 10px 14px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.optimize-panel__header--before { color: var(--red-err); }
.optimize-panel__header--after { color: var(--green); }

.optimize-panel__code {
  padding: 14px;
  line-height: 1.7;
}

.optimize-stats {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px;
}

.optimize-stats__title {
  color: var(--amber);
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.optimize-stat {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
  border-bottom: 1px solid var(--border);
}

.optimize-stat:last-child { border-bottom: none; }

.optimize-stat__label { color: var(--text-secondary); }
.optimize-stat__value { color: var(--cyan); font-weight: 500; }
.optimize-stat__value--improved { color: var(--green); }

/* ──────────────────────── Target Viewer ───────────────────────── */
.target-viewer {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  background: var(--bg-void);
}

.target-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.target-code {
  background: var(--bg-base);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
}

.target-section {
  margin-bottom: 16px;
}

.target-section__title {
  color: var(--purple);
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}

.target-line {
  display: flex;
  gap: 12px;
  padding: 4px 0;
}

.target-line__addr {
  color: var(--text-muted);
  min-width: 80px;
  flex-shrink: 0;
}

.target-line__instr {
  color: var(--accent-bright);
  min-width: 120px;
  flex-shrink: 0;
}

.target-line__ops {
  color: var(--cyan);
}

.target-line__comment {
  color: var(--text-muted);
  font-style: italic;
}

/* ──────────────────────── Demo Viewer ──────────────────────────── */
.demo-viewer {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  background: var(--bg-void);
}

.demo-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  font-family: var(--font-ui);
  font-size: 13px;
}

.demo-layer {
  margin-bottom: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-panel);
}

.demo-layer__header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background var(--transition);
}

.demo-layer__header:hover {
  background: var(--bg-hover);
}

.demo-layer__num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
}

.demo-layer__info {
  flex: 1;
}

.demo-layer__title {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 14px;
  margin-bottom: 2px;
}

.demo-layer__subtitle {
  font-size: 11px;
  color: var(--text-dim);
}

.demo-layer__toggle {
  color: var(--text-dim);
  font-size: 16px;
  transition: transform var(--transition);
}

.demo-layer.expanded .demo-layer__toggle {
  transform: rotate(180deg);
}

.demo-layer__body {
  display: none;
  padding: 16px;
}

.demo-layer.expanded .demo-layer__body {
  display: block;
}

.demo-step {
  margin-bottom: 16px;
}

.demo-step__title {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--bg-base);
  border-left: 3px solid var(--accent-primary);
  color: var(--accent-bright);
  font-weight: 600;
  font-size: 12px;
  margin-bottom: 8px;
}

.demo-step__content {
  padding: 12px;
  background: var(--bg-void);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  overflow-x: auto;
}

.demo-step__content code {
  color: var(--text-code);
  white-space: pre-wrap;
}

.demo-step__highlight {
  background: rgba(99, 137, 255, 0.15);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--accent-bright);
}

.demo-step__result {
  margin-top: 8px;
  padding: 8px 12px;
  background: var(--green-glow);
  border-left: 3px solid var(--green);
  color: var(--green);
  font-size: 12px;
}

.demo-explanation {
  padding: 12px;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.6;
  margin-top: 12px;
}

.demo-explanation strong {
  color: var(--amber);
}

.demo-flow {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px;
  background: var(--bg-base);
  border-radius: var(--radius-sm);
  margin: 8px 0;
}

.demo-flow__input, .demo-flow__output {
  flex: 1;
  padding: 8px 12px;
  background: var(--bg-void);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-code);
}

.demo-flow__arrow {
  color: var(--amber);
  font-size: 20px;
}

.demo-flow__label {
  font-size: 10px;
  color: var(--text-dim);
  text-align: center;
}

/* ──────────────────────── Emission Viewer ──────────────────────── */
.emission-viewer {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  background: var(--bg-void);
}

.emission-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.emission-final {
  background: var(--bg-base);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 16px;
}

.emission-hex {
  color: var(--text-code);
  line-height: 1.6;
  word-break: break-all;
}

/* ══════════════════════════════════════════════════════════════════
   RESPONSIVE DESIGN — Mobile First Approach
═════════════════════════════════════════════════════════════════════ */

/* MOBILE (< 768px) — Primary mobile layout */
@media (max-width: 768px) {
  :root {
    --header-h: 50px;
    --panel-header-h: 40px;
    --explorer-w: 100%;
    --console-w: 100%;
  }
  
  body {
    font-size: 13px;
  }
  
  /* Menu bar responsive */
  .menubar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 8px;
    height: auto;
  }
  
  .menubar__logo {
    flex: 1;
    min-width: 120px;
    font-size: 12px;
    text-align: center;
    padding: 4px 0;
  }
  
  .logo-sub {
    display: none;
  }
  
  .logo-text, .logo-lang {
    font-size: 11px;
  }
  
  .menubar__actions {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
    order: 3;
  }
  
  .menubar__status {
    width: 100%;
    justify-content: center;
    order: 2;
    padding: 4px 0;
    font-size: 11px;
  }
  
  .btn {
    padding: 6px 4px;
    font-size: 10px;
    height: auto;
    min-height: 32px;
  }
  
  .btn-icon {
    font-size: 14px;
    margin-right: 0;
    display: block;
  }
  
  .btn span:not(.btn-icon) {
    display: none;
  }
  
  .theme-selector {
    grid-column: 1 / -1;
    padding: 6px 4px;
    font-size: 11px;
  }
  
  /* IDE Layout - Stack vertically and allow scrolling */
  .ide-layout {
    position: relative !important;
    top: auto !important;
    bottom: auto !important;
    flex-direction: column;
    overflow-y: auto !important;
    overflow-x: hidden;
    padding: 6px;
    gap: 6px;
    min-height: calc(100vh - var(--header-h) - var(--statusbar-h));
    padding-bottom: 100px;
  }
  
  /* Explorer Panel */
  .panel--explorer {
    width: 100%;
    max-height: 200px;
    flex-shrink: 0;
    border-radius: 4px;
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    overflow-y: auto !important;
  }
  
  .panel--explorer.collapsed {
    width: 100%;
    max-height: auto;
  }
  
  .explorer-section {
    max-height: 160px;
    overflow-y: auto;
    font-size: 12px;
  }
  
  .file-item {
    padding: 4px 8px;
    font-size: 11px;
  }
  
  .file-icon {
    font-size: 12px;
    margin-right: 4px;
  }
  
  .lang-ref {
    max-height: 100px;
    overflow-y: auto;
    font-size: 10px;
    padding: 8px;
  }
  
  /* Editor Panel */
  .panel--editor {
    width: 100%;
    min-height: 300px;
    flex: 0 1 auto;
    border-radius: 4px;
    overflow: hidden !important;
  }
  
  .panel__header {
    padding: 6px 8px;
    font-size: 11px;
    height: auto;
    min-height: 36px;
    flex-wrap: wrap;
    gap: 4px;
  }
  
  .editor-tabs {
    width: 100%;
    overflow-x: auto !important;
    display: flex;
    gap: 2px;
    padding: 2px 0;
    -webkit-overflow-scrolling: touch;
    flex-wrap: nowrap;
  }
  
  .tab {
    padding: 4px 8px;
    font-size: 10px;
    white-space: nowrap;
    flex-shrink: 0;
  }
  
  #editor-filename {
    flex: 1;
    min-width: 80px;
    font-size: 11px;
  }
  
  .editor-info {
    width: 100%;
    font-size: 9px;
    justify-content: space-between;
  }
  
  #code-editor {
    font-size: 12px;
    line-height: 1.4;
  }
  
  .line-numbers {
    width: 30px;
    font-size: 11px;
  }
  
  /* Console Panel - Scrollable on mobile */
  .panel--console {
    width: 100%;
    min-height: 200px;
    flex-shrink: 0;
    border-radius: 4px;
    border-left: 1px solid var(--border);
    border-top: 1px solid var(--border);
    overflow-y: auto !important;
  }
  
  .console-output {
    font-size: 10px;
    padding: 8px;
  }
  
  .console-line {
    padding: 2px 0;
    font-size: 10px;
  }
  
  /* Hide pipeline layers and symbol table on mobile - show only output */
  .pipeline-viz {
    display: none;
  }
  
  .symbol-table-wrapper {
    display: none;
  }
  
  .panel__header--sub {
    display: none;
  }
  
  /* Status bar */
  .statusbar {
    height: 28px;
    font-size: 10px;
  }
  
  .statusbar__item {
    padding: 0 8px;
    font-size: 10px;
  }
  
  /* Modal */
  .modal {
    width: 95vw !important;
    max-height: 85vh;
    border-radius: 6px;
  }
  
  .modal__header {
    padding: 10px 12px;
    font-size: 12px;
  }
  
  .modal__body {
    padding: 12px 14px;
    font-size: 11px;
  }
  
  .help-section {
    margin-bottom: 16px;
  }
  
  .help-section h3 {
    font-size: 11px;
  }
  
  .help-section p {
    font-size: 11px;
  }
  
  .help-code {
    font-size: 10px;
    padding: 10px;
  }
  
  .help-table {
    font-size: 10px;
  }
  
  .help-table th, .help-table td {
    padding: 4px 6px;
  }
  
  kbd {
    font-size: 9px;
    padding: 2px 6px;
  }
}

/* TABLET (768px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
  :root {
    --explorer-w: 150px;
    --console-w: 200px;
    --header-h: 48px;
  }
  
  .menubar {
    padding: 8px;
    gap: 6px;
  }
  
  .menubar__logo {
    font-size: 13px;
  }
  
  .menubar__actions {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
  }
  
  .btn {
    padding: 6px 10px;
    font-size: 11px;
  }
  
  .btn span:not(.btn-icon) {
    display: inline;
  }
  
  .panel--explorer {
    width: var(--explorer-w);
    min-width: 120px;
  }
  
  .panel--console {
    width: var(--console-w);
    min-width: 180px;
  }
  
  .editor-tabs {
    overflow-x: auto;
    flex-wrap: nowrap;
  }
  
  .tab {
    font-size: 11px;
    padding: 4px 8px;
  }
}

/* DESKTOP (> 1024px) */
@media (min-width: 1025px) {
  /* Keep default desktop layout */
}

.emission-binary {
  color: var(--text-dim);
  font-size: 10px;
  line-height: 1.4;
  word-break: break-all;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.emission-stats {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-top: 16px;
}

.emission-stats__title {
  color: var(--green);
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

/* ──────────────────────── Empty States ────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 10px;
  color: var(--text-dim);
  font-family: var(--font-ui);
  font-size: 13px;
}

.empty-state__icon {
  font-size: 30px;
  filter: grayscale(0.6);
  opacity: 0.35;
}

.empty-state__sub {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ──────────────────────── Status Bar ──────────────────────────── */
.statusbar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: var(--statusbar-h);
  background: linear-gradient(90deg, #4a6bff 0%, #3a5bbf 40%, #2a4b8f 100%);
  display: flex;
  align-items: center;
  z-index: 100;
  overflow: hidden;
}

.statusbar__item {
  padding: 0 12px;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2px;
  color: rgba(255,255,255,0.8);
  border-right: 1px solid rgba(255,255,255,0.14);
  height: 100%;
  display: flex;
  align-items: center;
  white-space: nowrap;
  transition: background var(--transition);
}

.statusbar__item:hover {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

.statusbar__item--lang {
  background: rgba(0,0,0,0.2);
  color: #fff;
  font-weight: 700;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.5px;
}

.statusbar__item--right {
  margin-left: auto;
  border-right: none;
  border-left: 1px solid rgba(255,255,255,0.14);
}

/* ──────────────────────── Help Modal ──────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(7,9,15,0.82);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
}

.modal-overlay.open { display: flex; }

.modal {
  width: 640px;
  max-width: 95vw;
  max-height: 82vh;
  background: var(--bg-panel);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-lg);
  box-shadow:
    0 0 0 1px var(--border),
    0 24px 80px rgba(0,0,0,0.6),
    0 0 60px rgba(99,137,255,0.07);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: modal-in 0.22s cubic-bezier(0.34,1.56,0.64,1);
}

@keyframes modal-in {
  from { transform: scale(0.93) translateY(-10px); opacity: 0; }
  to   { transform: scale(1) translateY(0);         opacity: 1; }
}

.modal__header {
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  flex-shrink: 0;
}

.modal__close {
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px 10px;
  font-size: 14px;
  line-height: 1;
  transition: all var(--transition);
}
.modal__close:hover {
  border-color: var(--red-err);
  color: var(--red-err);
  background: rgba(248,113,113,0.08);
}

.modal__body {
  padding: 22px 24px;
  overflow-y: auto;
  flex: 1;
}

.help-section { margin-bottom: 24px; }
.help-section:last-child { margin-bottom: 0; }

.help-section h3 {
  color: var(--accent-bright);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.help-section p {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.75;
  font-family: var(--font-ui);
}

.help-code {
  background: var(--bg-void);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-code);
  line-height: 1.75;
  overflow-x: auto;
}

.shortcuts { display: flex; flex-direction: column; gap: 8px; }

.shortcuts div {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 13px;
  font-family: var(--font-ui);
}

/* Help Table Styles */
.help-table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
  font-family: var(--font-mono);
  font-size: 12px;
}

.help-table th {
  background: var(--bg-elevated);
  color: var(--accent-bright);
  padding: 10px 12px;
  text-align: left;
  border-bottom: 2px solid var(--accent-primary);
  font-weight: 600;
}

.help-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}

.help-table tr:hover td {
  background: var(--bg-hover);
}

.help-table td:first-child {
  color: var(--purple);
  font-weight: 500;
}

.help-table td:nth-child(2) {
  color: var(--cyan);
}

kbd {
  background: var(--bg-elevated);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  color: var(--accent-bright);
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.5px;
  box-shadow: 0 2px 0 rgba(0,0,0,0.4);
  white-space: nowrap;
}

/* ──────────────────────── Collapsed Explorer ───────────────────── */
.panel--explorer.collapsed .explorer-section,
.panel--explorer.collapsed .lang-ref,
.panel--explorer.collapsed .panel__icon,
.panel--explorer.collapsed > *:not(.panel__header) {
  display: none;
}

.panel--explorer.collapsed .panel__header {
  writing-mode: vertical-rl;
  justify-content: center;
  padding: 14px 0;
  height: 100%;
}

.panel--explorer.collapsed .panel__collapse {
  transform: rotate(180deg);
  margin: 0;
}

/* ──────────────────────── Error / States ───────────────────────── */
.error-glow {
  box-shadow: 0 0 0 2px var(--red-err), 0 0 20px var(--red-glow);
  border-color: var(--red-err) !important;
}

/* ──────────────────────── Misc Animations ──────────────────────── */
@keyframes blink {
  0%,100% { opacity: 1; }
  50%      { opacity: 0; }
}

.blink { animation: blink 1s step-end infinite; }

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