/* ============================================================
   NetRoute Simulator — Technical Brutalism Design System
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;600;700&family=Space+Mono:ital,wght@0,400;0,700;1,400&display=swap');

/* --- Custom Properties --- */
:root {
  --bg-void: #0A0B0E;
  --surface-charcoal: #121418;
  --grid-gray: #262930;
  --grid-gray-light: #3A3F47;
  
  --signal-orange: #FF3E00;
  --radar-cyan: #00E5FF;
  --phosphor-green: #39FF14;
  --alert-red: #FF003C;

  --text-main: #E0E4EA;
  --text-muted: #8E95A3;
  
  --font-ui: 'Space Grotesk', sans-serif;
  --font-data: 'Space Mono', monospace;

  --pattern-color: rgba(255,255,255,0.02);

  --transition-fast: 0.15s cubic-bezier(0, 0, 0.2, 1);
  --border-thick: 2px solid var(--grid-gray-light);
  --border-thin: 1px solid var(--grid-gray);
}

/* --- Light Mode Overrides --- */
body.light-theme {
  --bg-void: #F3F4F6; /* Light gray background */
  --surface-charcoal: #FFFFFF; /* Pure white panels */
  --grid-gray: #D1D5DB; /* Light borders */
  --grid-gray-light: #9CA3AF; /* Slightly darker borders */
  --text-main: #111827; /* Near black text */
  --text-muted: #6B7280; /* Gray text */
  --signal-orange: #EA580C; /* Darker orange for contrast */
  --radar-cyan: #0284C7; /* Darker blue */
  --phosphor-green: #16A34A; /* Darker green */
  --alert-red: #DC2626; /* Darker red */
  --pattern-color: rgba(0,0,0,0.04);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: inherit;
}

html, body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  font-family: var(--font-ui);
  background: var(--bg-void);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--signal-orange);
  color: var(--bg-void);
}

/* --- App Grid Layout --- */
body {
  padding: 16px;
  background: var(--bg-void);
}

#app {
  display: flex;
  flex-direction: column;
  width: calc(100vw - 32px);
  height: calc(100vh - 32px);
  border: var(--border-thin);
  background: var(--bg-void);
}

.layout-grid {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ============================================================
   Header
   ============================================================ */
.header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: var(--surface-charcoal);
  border-bottom: var(--border-thin);
  z-index: 10;
}

.header__brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header__logo {
  width: 32px;
  height: 32px;
  background: var(--signal-orange);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg-void);
  font-weight: 700;
  font-family: var(--font-data);
  font-size: 16px;
  border: 1px solid var(--signal-orange);
}

.header__title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
  text-transform: uppercase;
}

.header__status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 12px;
  font-family: var(--font-data);
  font-size: 11px;
  text-transform: uppercase;
  color: var(--phosphor-green);
  border: 1px solid var(--grid-gray-light);
  background: rgba(57, 255, 20, 0.05);
}

.header__status-dot {
  width: 8px;
  height: 8px;
  background: var(--phosphor-green);
  box-shadow: 0 0 8px var(--phosphor-green);
  animation: blink 2s steps(2, start) infinite;
}

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

/* ============================================================
   Panels
   ============================================================ */
.panel-left, .panel-right {
  width: 280px;
  background: var(--bg-void);
  border-right: var(--border-thin);
  overflow-y: auto;
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  flex-shrink: 0;
}

.panel-right {
  border-right: none;
  border-left: var(--border-thin);
}

.panel-left::-webkit-scrollbar, .panel-right::-webkit-scrollbar { width: 6px; }
.panel-left::-webkit-scrollbar-track, .panel-right::-webkit-scrollbar-track { background: var(--bg-void); }
.panel-left::-webkit-scrollbar-thumb, .panel-right::-webkit-scrollbar-thumb { background: var(--grid-gray-light); }

/* --- Section Card --- */
.section-card {
  background: var(--surface-charcoal);
  padding: 16px;
  border: var(--border-thin);
  position: relative;
}

.section-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 8px; height: 8px;
  border-top: 2px solid var(--signal-orange);
  border-left: 2px solid var(--signal-orange);
}

.section-card__title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--grid-gray);
  font-family: var(--font-data);
  margin-left:8px;
  margin-top:8px;
}

.section-card__title .icon {
  color: var(--signal-orange);
  font-weight: 700;
}

.section-hint {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 10px;
  font-family: var(--font-data);
  border-left: 2px solid var(--grid-gray-light);
  padding-left: 8px;
}

/* --- Slider Controls --- */
.slider-group {
  margin-bottom: 16px;
}

.slider-group:last-of-type {
  margin-bottom: 8px;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  font-family: var(--font-data);
  text-transform: uppercase;
  color: var(--text-main);
  margin-bottom: 8px;
}

.slider-label__value {
  color: var(--radar-cyan);
  font-weight: 700;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--grid-gray);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 16px;
  background: var(--radar-cyan);
  cursor: pointer;
  border-radius: 0;
  border: 1px solid var(--bg-void);
  transition: transform var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scaleY(1.2);
  background: var(--signal-orange);
}

/* --- Buttons --- */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 10px;
  border: var(--border-thin);
  background: transparent;
  color: var(--text-main);
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.btn:active {
  transform: translateY(2px);
}

.btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  pointer-events: none;
}

.btn--primary {
  background: var(--signal-orange);
  color: var(--bg-void);
  border-color: var(--signal-orange);
}

.btn--primary:hover {
  background: var(--bg-void);
  color: var(--signal-orange);
}

.btn--secondary {
  background: var(--surface-charcoal);
  border: 1px solid var(--grid-gray-light);
}

.btn--secondary:hover {
  border-color: var(--text-main);
  background: var(--grid-gray);
}

.btn--secondary.active {
  background: var(--radar-cyan);
  color: var(--bg-void);
  border-color: var(--radar-cyan);
}

.btn--danger {
  color: var(--alert-red);
  border-color: var(--grid-gray-light);
}

.btn--danger:hover {
  background: var(--alert-red);
  color: var(--bg-void);
  border-color: var(--alert-red);
}

.btn--algo {
  justify-content: flex-start;
  padding-left: 14px;
}

.btn--algo:hover {
  border-color: var(--radar-cyan);
  color: var(--radar-cyan);
}

/* --- Pause / Resume button (amber) --- */
.btn--pause {
  background: transparent;
  color: #F59E0B;
  border-color: #F59E0B;
  animation: pausePulse 1.4s ease-in-out infinite;
}

.btn--pause:hover {
  background: #F59E0B;
  color: var(--bg-void);
  animation: none;
}

@keyframes pausePulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(245,158,11,0); }
  50%       { box-shadow: 0 0 0 4px rgba(245,158,11,0.25); }
}

/* --- Stop button (red) --- */
.btn--stop {
  background: transparent;
  color: var(--alert-red);
  border-color: var(--alert-red);
}

.btn--stop:hover {
  background: var(--alert-red);
  color: var(--bg-void);
}

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

/* --- Packet Selection Display --- */
.selection-display {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px;
  background: var(--bg-void);
  border: 1px solid var(--grid-gray-light);
  font-family: var(--font-data);
}

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

.selection-node__label {
  font-size: 9px;
  color: var(--text-muted);
  text-transform: uppercase;
}

.selection-node__value {
  font-size: 16px;
  color: var(--signal-orange);
}

.selection-arrow {
  color: var(--grid-gray-light);
  font-size: 14px;
}

/* --- Terminal / System Logs --- */
.terminal {
  background: var(--bg-void);
  border: 1px solid var(--grid-gray-light);
  padding: 12px;
  height: 160px;
  overflow-y: auto;
  font-family: var(--font-data);
  font-size: 10px;
  line-height: 1.6;
}

.terminal::-webkit-scrollbar { width: 4px; }
.terminal::-webkit-scrollbar-track { background: var(--bg-void); }
.terminal::-webkit-scrollbar-thumb { background: var(--grid-gray-light); }

.terminal .log-line {
  word-break: break-all;
  border-bottom: 1px solid rgba(255,255,255,0.02);
  padding-bottom: 4px;
  margin-bottom: 4px;
}

.terminal .log-line--info { color: var(--text-muted); }
.terminal .log-line--success { color: var(--phosphor-green); }
.terminal .log-line--error { color: var(--alert-red); }

.terminal .log-timestamp {
  color: var(--grid-gray-light);
  margin-right: 8px;
}

/* ============================================================
   Main Center Area
   ============================================================ */
.panel-center {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 19px,
    var(--pattern-color) 20px
  ),
  repeating-linear-gradient(
    90deg,
    transparent,
    transparent 19px,
    var(--pattern-color) 20px
  );
  overflow: hidden;
}

/* --- Top Bar Generation --- */
.top-bar {
  border-bottom: var(--border-thin);
  border-top: none;
  border-left: none;
  border-right: none;
  margin: 0;
  padding: 16px 24px;
}

.generator-controls {
  display: flex;
  align-items: flex-end;
  gap: 20px;
}

.generator-controls .slider-group {
  flex: 1;
  margin-bottom: 0;
}

.generator-btn {
  width: 200px;
  height: 38px;
}

/* --- Canvas Row --- */
.canvas-row {
  display: flex;
  gap: 24px;
  padding: 24px;
  flex: 1;
  min-height: 0;
}

.canvas-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--surface-charcoal);
  border: var(--border-thin);
  position: relative;
  overflow: hidden;
}

/* Brutalist corners */
.canvas-panel::after {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 10px; height: 10px;
  border-bottom: 1px solid var(--grid-gray);
  border-left: 1px solid var(--grid-gray);
  background: var(--bg-void);
}

.canvas-panel--hidden {
  display: none;
}

.canvas-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: var(--border-thin);
  background: var(--grid-gray);
}

.canvas-panel__title {
  font-family: var(--font-data);
  font-size: 11px;
  text-transform: uppercase;
  color: var(--text-main);
  letter-spacing: 1px;
}

.canvas-panel__badge {
  font-family: var(--font-data);
  font-size: 9px;
  padding: 4px 8px;
  background: var(--bg-void);
  color: var(--radar-cyan);
  border: 1px solid var(--radar-cyan);
}

.canvas-panel__badge:empty {
  display: none;
}

.canvas-panel__body {
  flex: 1;
  position: relative;
  background: var(--bg-void);
}

.canvas-panel__body canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* --- Resizer Handlers --- */
.horizontal-resizer {
  height: 8px;
  background: var(--surface-charcoal);
  border-top: var(--border-thin);
  border-bottom: var(--border-thin);
  cursor: ns-resize;
  flex-shrink: 0;
  transition: background 0.2s;
}

.horizontal-resizer:hover, .horizontal-resizer:active {
  background: var(--grid-gray-light);
}

/* --- Bottom Bar --- */
.bottom-bar {
  display: flex;
  gap: 24px;
  padding: 16px 24px;
  background: var(--surface-charcoal);
  border-top: none; /* handled by resizer */
  height: 220px;
  flex-shrink: 0;
  min-height: 40px;
}

.stats-row {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stat-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-direction: row;
  background: var(--bg-void);
  border: var(--border-thin);
  padding: 12px 16px;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  width: 4px;
}

.stat-card:nth-child(1)::before { background: var(--signal-orange); }
.stat-card:nth-child(2)::before { background: var(--radar-cyan); }
.stat-card:nth-child(3)::before { background: var(--phosphor-green); }

.stat-card__icon {
  display: none; /* Hide soft emojis */
}

.stat-card__info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.stat-card__label {
  font-family: var(--font-data);
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.stat-card__value {
  font-family: var(--font-data);
  font-size: 24px;
  font-weight: 400;
  color: var(--text-main);
}

.stat-card:nth-child(1) .stat-card__value { color: var(--signal-orange); }
.stat-card:nth-child(2) .stat-card__value { color: var(--radar-cyan); }
.stat-card:nth-child(3) .stat-card__value { color: var(--phosphor-green); }

.logger-card {
  flex: 2;
  margin: 0;
  border-left: none;
  border-right: none;
  border-top: none;
  border-bottom: none;
  padding: 0;
}

.logger-card .terminal {
  height: 120px;
}

/* ============================================================
   Dijkstra Modal
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 11, 14, 0.85); /* Void Black with opacity */
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--surface-charcoal);
  border: 1px solid var(--signal-orange);
  padding: 32px;
  width: 400px;
  box-shadow: 8px 8px 0px rgba(255, 62, 0, 0.2);
}

.modal__title {
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--signal-orange);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--grid-gray-light);
}

.modal__field {
  margin-bottom: 20px;
}

.modal__field label {
  display: block;
  font-family: var(--font-data);
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.modal__field input {
  width: 100%;
  padding: 12px;
  background: var(--bg-void);
  border: 1px solid var(--grid-gray-light);
  color: var(--text-main);
  font-family: var(--font-data);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.modal__field input:focus {
  border-color: var(--signal-orange);
}

.modal__actions {
  display: flex;
  gap: 16px;
  margin-top: 32px;
}

.modal__actions .btn {
  flex: 1;
}

/* ============================================================
   Utility / Hacks
   ============================================================ */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

/* ============================================================
   Compact Mode — Stats & Logs overflow into side panels
   ============================================================ */

/* Hidden by default; shown when .layout--compact is applied to #app */
.side-slot {
  display: none;
}

.layout--compact .side-slot {
  display: block;
}

/* Logs slot needs flex so the terminal can grow vertically */
.layout--compact #side-logs-slot {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

/* --- Stats in the left panel --- */
#side-stats-slot .stats-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

#side-stats-slot .stat-card {
  padding: 8px 12px;
}

#side-stats-slot .stat-card__value {
  font-size: 16px;
}

/* --- Logger card in the right panel --- */
#side-logs-slot .logger-card {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  /* Restore borders stripped for the bottom-bar context */
  border: var(--border-thin);
  padding: 16px;
}

#side-logs-slot .logger-card .section-card__title {
  margin-left: 0;
  margin-top: 0;
}

#side-logs-slot .logger-card .terminal {
  /* Grow instead of fixed height */
  flex: 1;
  height: unset;
  min-height: 80px;
}