/* === CSS Variables === */
:root {
  --bg-deep: #06080f;
  --bg-base: #0b0e18;
  --bg-surface: #0f1320;
  --bg-raised: #141928;
  --bg-overlay: #1a2035;

  --border-dim: rgba(56, 189, 248, 0.08);
  --border-subtle: rgba(56, 189, 248, 0.15);
  --border-accent: rgba(56, 189, 248, 0.3);

  --cyan: #38bdf8;
  --cyan-dim: rgba(56, 189, 248, 0.15);
  --cyan-glow: rgba(56, 189, 248, 0.4);
  --magenta: #f472b6;
  --magenta-dim: rgba(244, 114, 182, 0.15);
  --magenta-glow: rgba(244, 114, 182, 0.4);
  --green: #34d399;
  --green-dim: rgba(52, 211, 153, 0.12);
  --amber: #fbbf24;
  --red: #fb7185;
  --red-dim: rgba(251, 113, 133, 0.12);

  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #475569;

  --font-ui: 'Outfit', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-med: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* === Body === */
body {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-ui);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === Toolbar === */
.toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  height: 62px;
  min-height: 62px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-dim);
  position: relative;
  z-index: 10;
}

.toolbar::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--cyan-dim) 20%,
    var(--cyan) 50%,
    var(--cyan-dim) 80%,
    transparent 100%
  );
  opacity: 0.4;
}

/* Brand */
.toolbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: 12px;
  flex-shrink: 0;
}

.brand-icon {
  width: 26px;
  height: 26px;
  color: var(--cyan);
  filter: drop-shadow(0 0 6px var(--cyan-glow));
}

.brand-name {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, var(--cyan), var(--magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Toolbar actions */
.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.toolbar-separator {
  width: 1px;
  height: 24px;
  background: var(--border-subtle);
  margin: 0 4px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 20px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--bg-raised);
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 500;
  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
  user-select: none;
  white-space: nowrap;
}

.btn:hover {
  color: var(--text-primary);
  background: var(--bg-overlay);
  border-color: var(--border-accent);
}

.btn:active {
  transform: scale(0.97);
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Accent button */
.btn--accent:hover {
  border-color: var(--cyan);
  box-shadow:
    0 0 12px var(--cyan-dim),
    inset 0 0 12px var(--cyan-dim);
  color: var(--cyan);
}

.btn--accent.active {
  background: var(--cyan-dim);
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow:
    0 0 16px var(--cyan-dim),
    inset 0 0 16px var(--cyan-dim);
}

/* Danger button */
.btn--danger:hover {
  border-color: var(--magenta);
  box-shadow:
    0 0 12px var(--magenta-dim),
    inset 0 0 12px var(--magenta-dim);
  color: var(--magenta);
}

.btn--danger.active {
  background: var(--magenta-dim);
  border-color: var(--magenta);
  color: var(--magenta);
  box-shadow:
    0 0 16px var(--magenta-dim),
    inset 0 0 16px var(--magenta-dim);
  animation: pulse-danger 2s ease-in-out infinite;
}

@keyframes pulse-danger {
  0%,
  100% {
    box-shadow:
      0 0 16px var(--magenta-dim),
      inset 0 0 16px var(--magenta-dim);
  }
  50% {
    box-shadow:
      0 0 24px var(--magenta-glow),
      inset 0 0 20px var(--magenta-dim);
  }
}

/* Run button */
.btn--run {
  background: linear-gradient(135deg, rgba(52, 211, 153, 0.12), rgba(52, 211, 153, 0.06));
  border-color: rgba(52, 211, 153, 0.25);
  color: var(--green);
}

.btn--run:hover {
  border-color: var(--green);
  box-shadow:
    0 0 16px rgba(52, 211, 153, 0.2),
    inset 0 0 16px rgba(52, 211, 153, 0.1);
  color: var(--green);
  background: linear-gradient(135deg, rgba(52, 211, 153, 0.18), rgba(52, 211, 153, 0.08));
}

.btn--run:active {
  box-shadow:
    0 0 24px rgba(52, 211, 153, 0.3),
    inset 0 0 24px rgba(52, 211, 153, 0.15);
}

.btn--run svg {
  filter: drop-shadow(0 0 4px rgba(52, 211, 153, 0.5));
  transition: transform 0.2s ease;
}

/* Executing state — pulsing glow */
.btn--run.executing {
  animation: run-pulse 1s ease-in-out infinite;
  pointer-events: none;
}

.btn--run.executing svg {
  animation: run-spin 0.8s linear infinite;
}

@keyframes run-pulse {
  0%,
  100% {
    box-shadow:
      0 0 12px rgba(52, 211, 153, 0.15),
      inset 0 0 12px rgba(52, 211, 153, 0.08);
  }
  50% {
    box-shadow:
      0 0 28px rgba(52, 211, 153, 0.35),
      inset 0 0 20px rgba(52, 211, 153, 0.15);
  }
}

@keyframes run-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Flash on success / error */
.btn--run.flash-success {
  animation: flash-green 0.6s ease-out;
}

.btn--run.flash-error {
  animation: flash-red 0.6s ease-out;
}

@keyframes flash-green {
  0% {
    box-shadow:
      0 0 40px rgba(52, 211, 153, 0.6),
      inset 0 0 30px rgba(52, 211, 153, 0.25);
  }
  100% {
    box-shadow: none;
  }
}

@keyframes flash-red {
  0% {
    box-shadow:
      0 0 40px rgba(251, 113, 133, 0.6),
      inset 0 0 30px rgba(251, 113, 133, 0.25);
  }
  100% {
    box-shadow: none;
  }
}

/* Toolbar end (status + lang) */
.toolbar-end {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* Language toggle */
.btn--lang {
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.5px;
  border-color: var(--border-subtle);
  color: var(--text-secondary);
}

.btn--lang:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 10px var(--cyan-dim);
}

/* Status indicator */
.toolbar-status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border-radius: 20px;
  background: var(--bg-raised);
  border: 1px solid var(--border-dim);
  flex-shrink: 0;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan-glow);
  animation: pulse-dot 2.5s ease-in-out infinite;
  transition:
    background 0.3s ease,
    box-shadow 0.3s ease;
}

.status-dot--edge {
  background: var(--green);
  box-shadow: 0 0 8px rgba(52, 211, 153, 0.4);
}

.status-dot--delete {
  background: var(--magenta);
  box-shadow: 0 0 8px var(--magenta-glow);
}

@keyframes pulse-dot {
  0%,
  100% {
    opacity: 1;
    box-shadow: 0 0 8px var(--cyan-glow);
  }
  50% {
    opacity: 0.5;
    box-shadow: 0 0 4px var(--cyan-dim);
  }
}

.status-text {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
}

/* === Main content === */
.main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* === Graph panel === */
.graph-panel {
  flex: 0 0 55%;
  position: relative;
  background: var(--bg-deep);
  overflow: hidden;
}

/* Ambient glow — drifts slowly */
.graph-panel .graph-ambient {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  animation: ambient-drift 12s ease-in-out infinite alternate;
}

/* Line grid background */
.graph-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.1;
  transition: opacity 0.4s ease;
  background-image:
    linear-gradient(to right, var(--text-muted) 1px, transparent 1px),
    linear-gradient(to bottom, var(--text-muted) 1px, transparent 1px);
  background-size: 30px 30px;
}

.graph-grid.hidden {
  opacity: 0;
}

/* Subtle vignette */
.graph-panel::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 40%, var(--bg-deep) 100%);
  pointer-events: none;
  z-index: 1;
  opacity: 0.6;
}

@keyframes ambient-drift {
  0% {
    transform: translate(0, 0) scale(1);
    opacity: 0.5;
  }
  50% {
    transform: translate(30px, -20px) scale(1.1);
    opacity: 0.7;
  }
  100% {
    transform: translate(-20px, 15px) scale(0.95);
    opacity: 0.5;
  }
}

#cy {
  width: 100%;
  height: 100%;
  position: relative;
  z-index: 2;
}

/* Corner brackets */
.graph-overlay-corner {
  position: absolute;
  width: 20px;
  height: 20px;
  z-index: 3;
  pointer-events: none;
  opacity: 0.3;
}

.graph-overlay-corner--tl {
  top: 12px;
  left: 12px;
  border-top: 2px solid var(--cyan);
  border-left: 2px solid var(--cyan);
}

.graph-overlay-corner--tr {
  top: 12px;
  right: 12px;
  border-top: 2px solid var(--cyan);
  border-right: 2px solid var(--cyan);
}

.graph-overlay-corner--bl {
  bottom: 12px;
  left: 12px;
  border-bottom: 2px solid var(--cyan);
  border-left: 2px solid var(--cyan);
}

.graph-overlay-corner--br {
  bottom: 12px;
  right: 12px;
  border-bottom: 2px solid var(--cyan);
  border-right: 2px solid var(--cyan);
}

/* Graph controls container */
.graph-controls {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 4;
  display: flex;
  gap: 6px;
}

/* Graph control button (grid, directed, etc.) */
.graph-control-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  user-select: none;
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast),
    background var(--transition-fast),
    box-shadow var(--transition-fast);
}

.graph-control-btn svg {
  width: 16px;
  height: 16px;
}

.graph-control-btn:hover {
  color: var(--text-secondary);
  border-color: var(--border-accent);
  background: var(--bg-raised);
}

.graph-control-btn.active {
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 10px var(--cyan-dim);
  background: var(--bg-raised);
}

/* === Dividers (shared) === */
.divider {
  position: relative;
  flex-shrink: 0;
  z-index: 5;
}

.divider::before {
  content: '';
  position: absolute;
  transition: opacity var(--transition-med);
  opacity: 0;
}

.divider:hover::before,
.divider.dragging::before {
  opacity: 1;
}

/* Vertical divider (left ↔ right) */
.divider--v {
  width: 7px;
  cursor: col-resize;
  background: var(--border-dim);
}

.divider--v::before {
  top: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(
    180deg,
    transparent 0%,
    var(--cyan) 30%,
    var(--cyan) 70%,
    transparent 100%
  );
  opacity: 0;
}

.divider--v::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 3px;
  height: 32px;
  border-radius: 2px;
  background: var(--text-muted);
  opacity: 0.4;
  transition:
    opacity var(--transition-fast),
    background var(--transition-fast);
}

.divider--v:hover::after,
.divider--v.dragging::after {
  background: var(--cyan);
  opacity: 0.9;
}

/* Horizontal divider (editor ↔ output) */
.divider--h {
  height: 7px;
  cursor: row-resize;
  background: var(--border-dim);
}

.divider--h::before {
  left: 0;
  right: 0;
  top: 0;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--cyan) 30%,
    var(--cyan) 70%,
    transparent 100%
  );
  opacity: 0;
}

.divider--h::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  height: 3px;
  width: 32px;
  border-radius: 2px;
  background: var(--text-muted);
  opacity: 0.4;
  transition:
    opacity var(--transition-fast),
    background var(--transition-fast);
}

.divider--h:hover::after,
.divider--h.dragging::after {
  background: var(--cyan);
  opacity: 0.9;
}

/* Prevent selection while dragging */
body.resizing {
  user-select: none;
  cursor: col-resize;
}

body.resizing-h {
  user-select: none;
  cursor: row-resize;
}

/* === Right panel === */
.right-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg-base);
}

.editor-section {
  flex: 3;
  display: flex;
  flex-direction: column;
  min-height: 80px;
  overflow: hidden;
}

.output-section {
  flex: 2;
  display: flex;
  flex-direction: column;
  min-height: 60px;
  overflow: hidden;
}

/* Section headers */
.editor-header,
.output-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-dim);
  letter-spacing: 0.5px;
  user-select: none;
}

.editor-header svg,
.output-header svg {
  opacity: 0.6;
}

.output-header {
  border-bottom: 1px solid var(--border-dim);
}

/* Language selector */
.lang-select {
  background: var(--bg-raised);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  transition:
    border-color var(--transition-fast),
    color var(--transition-fast);
}

.lang-select:hover {
  border-color: var(--border-accent);
  color: var(--text-primary);
}

.lang-select:focus {
  border-color: var(--cyan);
}

.lang-select option {
  background: var(--bg-surface);
  color: var(--text-primary);
}

/* === Editor === */
#editor {
  flex: 1;
  overflow: auto;
}

/* CodeMirror deep overrides */
#editor .CodeMirror {
  height: 100%;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.65;
  background: var(--bg-base);
  padding-top: 4px;
}

#editor .CodeMirror-gutters {
  background: var(--bg-base);
  border-right: 1px solid var(--border-dim);
  padding-right: 4px;
}

#editor .CodeMirror-linenumber {
  color: var(--text-muted);
  font-size: 12px;
  padding: 0 8px;
}

#editor .CodeMirror-cursor {
  border-left-color: var(--cyan);
  border-left-width: 2px;
}

#editor .CodeMirror-selected {
  background: rgba(56, 189, 248, 0.12) !important;
}

#editor .CodeMirror-activeline-background {
  background: rgba(56, 189, 248, 0.04);
}

#editor .CodeMirror-matchingbracket {
  color: var(--cyan) !important;
  border-bottom: 1px solid var(--cyan);
  background: var(--cyan-dim);
}

/* Scrollbar styling */
#editor .CodeMirror-vscrollbar::-webkit-scrollbar,
#editor .CodeMirror-hscrollbar::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

#editor .CodeMirror-vscrollbar::-webkit-scrollbar-track,
#editor .CodeMirror-hscrollbar::-webkit-scrollbar-track {
  background: transparent;
}

#editor .CodeMirror-vscrollbar::-webkit-scrollbar-thumb,
#editor .CodeMirror-hscrollbar::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 4px;
}

#editor .CodeMirror-vscrollbar::-webkit-scrollbar-thumb:hover,
#editor .CodeMirror-hscrollbar::-webkit-scrollbar-thumb:hover {
  background: var(--border-accent);
}

/* === Output === */
#output {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  background: var(--bg-deep);
  color: var(--green);
  white-space: pre-wrap;
  word-break: break-word;
}

#output::-webkit-scrollbar {
  width: 8px;
}

#output::-webkit-scrollbar-track {
  background: transparent;
}

#output::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 4px;
}

/* Output states */
#output.output--loading {
  color: var(--text-muted);
  animation: output-blink 1.2s ease-in-out infinite;
}

@keyframes output-blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}

#output.output--error {
  color: var(--red);
  animation: output-appear 0.3s ease-out;
}

#output.output--success {
  color: var(--green);
  animation: output-appear 0.3s ease-out;
}

@keyframes output-appear {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* === Animations === */
@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.toolbar {
  animation: fade-in-up 0.4s ease-out;
}

.graph-panel {
  animation: fade-in-up 0.5s ease-out 0.1s both;
}

.right-panel {
  animation: fade-in-up 0.5s ease-out 0.2s both;
}

/* === Tooltips === */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) scale(0.95);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-overlay);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 400;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast);
  z-index: 100;
}

[data-tooltip]:hover::after {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}

/* === Global scrollbar === */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(56, 189, 248, 0.15);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(56, 189, 248, 0.25);
}

/* === Selection === */
::selection {
  background: rgba(56, 189, 248, 0.2);
  color: var(--text-primary);
}