/* Modern CSS Design System - Chaos Game Sandbox (Theme Adaptive) */

:root {
  /* Light Theme (Default) */
  --bg-primary: #f4f4fa;
  --bg-secondary: #ececf3;
  --panel-bg: rgba(255, 255, 255, 0.85);
  --panel-bg-hover: rgba(240, 240, 255, 0.95);
  --panel-border: rgba(92, 77, 255, 0.12);
  
  --text-main: #1a1a2e;
  --text-muted: #6b6b8b;
  
  --accent-cyan: #008fae;
  --accent-cyan-glow: rgba(0, 143, 174, 0.15);
  --accent-magenta: #e84393;
  --accent-magenta-glow: rgba(232, 67, 147, 0.15);
  --accent-amber: #d87a00;
  --accent-purple: #8e44ad;
  
  --canvas-bg: #ffffff;
  --canvas-border: rgba(0, 0, 0, 0.08);
  --input-bg: rgba(0, 0, 0, 0.04);
  --button-hover: #00a4c5;
  
  --font-header: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.dark-theme {
  /* Dark Theme */
  --bg-primary: #0b0c10;
  --bg-secondary: #1f2833;
  --panel-bg: rgba(15, 22, 36, 0.7);
  --panel-bg-hover: rgba(30, 38, 54, 0.85);
  --panel-border: rgba(255, 255, 255, 0.08);
  
  --text-main: #f5f6f8;
  --text-muted: #8b9bb4;
  
  --accent-cyan: #66fcf1;
  --accent-cyan-glow: rgba(102, 252, 241, 0.35);
  --accent-magenta: #ff007f;
  --accent-magenta-glow: rgba(255, 0, 127, 0.35);
  --accent-amber: #f5a623;
  --accent-purple: #bd10e0;
  
  --canvas-bg: #040507;
  --canvas-border: rgba(255, 255, 255, 0.05);
  --input-bg: rgba(255, 255, 255, 0.04);
  --button-hover: #45f3e5;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-main);
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow: hidden;
  height: 100vh;
  position: relative;
}

/* Background Grids and Glows */
.bg-grid {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(128, 128, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(128, 128, 255, 0.015) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: center center;
  z-index: 1;
  pointer-events: none;
}

body.dark-theme .bg-grid {
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.012) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.012) 1px, transparent 1px);
}

.bg-glow {
  position: absolute;
  top: -20%;
  left: -20%;
  width: 140%;
  height: 140%;
  background: radial-gradient(circle at 70% 30%, var(--accent-cyan-glow) 0%, transparent 60%),
              radial-gradient(circle at 20% 80%, var(--accent-magenta-glow) 0%, transparent 60%);
  z-index: 1;
  pointer-events: none;
  opacity: 0.5;
}

/* main container */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: relative;
  z-index: 2;
}

/* Header */
.app-header {
  height: 60px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--panel-border);
  background: var(--bg-secondary);
  backdrop-filter: blur(10px);
  z-index: 10;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  font-size: 20px;
  color: var(--accent-cyan);
  text-shadow: 0 0 10px var(--accent-cyan-glow);
  animation: logo-pulse 4s infinite ease-in-out;
}

@keyframes logo-pulse {
  0%, 100% { transform: scale(1); filter: hue-rotate(0deg); }
  50% { transform: scale(1.1); filter: hue-rotate(180deg); }
}

.logo h1 {
  font-family: var(--font-header);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.accent-text {
  background: linear-gradient(135deg, var(--accent-cyan) 30%, var(--accent-magenta) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-btn {
  background: var(--input-bg);
  border: 1px solid var(--panel-border);
  color: var(--text-muted);
  height: 40px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-body);
  font-size: 0.85rem;
}

.icon-btn i {
  font-size: 0.95rem;
}

#theme-toggle {
  padding: 0 16px;
  gap: 8px;
  font-weight: 500;
  color: var(--text-main);
}

#btn-info {
  width: 40px;
}

.icon-btn:hover {
  background: var(--panel-bg-hover);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 12px var(--accent-cyan-glow);
  transform: translateY(-1px);
}

/* App Main Content */
.app-main {
  flex: 1;
  display: flex;
  height: calc(100vh - 115px); /* Adjusted for header + footer height */
  overflow: hidden;
  position: relative;
}

/* Canvas container */
.canvas-container {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--canvas-bg);
  overflow: hidden;
  transition: background-color 0.3s ease;
}

#chaos-canvas {
  max-width: 100%;
  max-height: 100%;
  border: 1px solid var(--canvas-border);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  cursor: crosshair;
}

body.dark-theme #chaos-canvas {
  box-shadow: 0 0 50px rgba(0, 0, 0, 0.6);
}

/* On-canvas dynamic overlays */
.canvas-overlay {
  position: absolute;
  padding: 8px 12px;
  border-radius: 6px;
  background: var(--panel-bg);
  backdrop-filter: blur(5px);
  border: 1px solid var(--panel-border);
  pointer-events: none;
  font-size: 0.8rem;
  letter-spacing: 0.5px;
}

.stats-overlay {
  top: 20px;
  left: 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: var(--text-muted);
}

.stats-overlay span {
  color: var(--text-main);
  font-weight: 600;
}

.hint-overlay {
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--accent-cyan);
  text-shadow: 0 0 8px var(--accent-cyan-glow);
  animation: pulse-glow 2s infinite ease-in-out;
  padding: 10px 18px;
  font-size: 0.85rem;
  border-color: var(--accent-cyan);
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* Controls Panel */
.controls-panel {
  width: 350px;
  background: var(--panel-bg);
  backdrop-filter: blur(20px);
  border-left: 1px solid var(--panel-border);
  display: flex;
  flex-direction: column;
  padding: 24px;
  overflow-y: auto;
  z-index: 5;
  gap: 24px;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.panel-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel-section h2 {
  font-family: var(--font-header);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--panel-border);
  padding-bottom: 8px;
}

/* Custom Controls Elements styling */
select {
  width: 100%;
  padding: 12px;
  background: var(--input-bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
  transition: var(--transition);
}

select:hover, select:focus {
  border-color: var(--accent-cyan);
  background: var(--panel-bg-hover);
  box-shadow: 0 0 10px var(--accent-cyan-glow);
}

option {
  background: var(--bg-secondary);
  color: var(--text-main);
}

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

.control-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.control-label span {
  color: var(--accent-cyan);
  font-weight: 600;
}

/* Ranges */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--input-bg);
  outline: none;
  margin: 10px 0;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan-glow);
  cursor: pointer;
  transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.slider-helper {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: -4px;
}

/* Custom Checkboxes */
.checkbox-group {
  margin: 4px 0;
}

.checkbox-container {
  display: flex;
  align-items: center;
  position: relative;
  padding-left: 28px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: color 0.2s;
}

.checkbox-container:hover {
  color: var(--text-main);
}

.checkbox-container input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

.checkmark {
  position: absolute;
  top: 1px;
  left: 0;
  height: 18px;
  width: 18px;
  background-color: var(--input-bg);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  transition: var(--transition);
}

.checkbox-container:hover input ~ .checkmark {
  background-color: var(--panel-bg-hover);
  border-color: rgba(128, 128, 128, 0.3);
}

.checkbox-container input:checked ~ .checkmark {
  background-color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan-glow);
}

.checkmark:after {
  content: "";
  position: absolute;
  display: none;
}

.checkbox-container input:checked ~ .checkmark:after {
  display: block;
}

.checkbox-container .checkmark:after {
  left: 5px;
  top: 2px;
  width: 5px;
  height: 9px;
  border: solid #ffffff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* Buttons */
.actions-group {
  display: flex;
  gap: 12px;
  margin-top: auto;
  padding-top: 12px;
}

.btn {
  flex: 1;
  padding: 12px;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
}

.btn-primary {
  background: var(--accent-cyan);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 15px var(--accent-cyan-glow);
}

body.dark-theme .btn-primary {
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: var(--button-hover);
  box-shadow: 0 4px 20px var(--accent-cyan-glow);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--input-bg);
  color: var(--text-main);
  border: 1px solid var(--panel-border);
}

.btn-secondary:hover {
  background: var(--panel-bg-hover);
  border-color: rgba(128, 128, 128, 0.3);
}

/* Info Note */
.info-note {
  font-size: 0.8rem;
  padding: 10px;
  background: rgba(216, 122, 0, 0.08);
  border-left: 3px solid var(--accent-amber);
  border-radius: 0 6px 6px 0;
  color: var(--accent-amber);
  line-height: 1.4;
  margin-top: 4px;
}

.hidden {
  display: none !important;
}

/* Footer (styled to match Mandelbrot) */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--panel-border);
  padding: 1.25rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  z-index: 10;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

footer .footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
  justify-content: center;
}

footer a {
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

footer a:hover {
  color: var(--button-hover);
  text-shadow: 0 0 8px var(--accent-cyan-glow);
  text-decoration: underline;
}

.footer-section-title {
  color: var(--text-main);
  font-weight: 600;
}

/* Modal Window styles */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(4, 5, 7, 0.4);
  backdrop-filter: blur(15px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

body.dark-theme .modal {
  background: rgba(4, 5, 7, 0.7);
}

.modal.show {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  width: 90%;
  max-width: 600px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
  transform: scale(0.95);
  transition: transform 0.3s ease;
}

body.dark-theme .modal-content {
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.modal.show .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--panel-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h2 {
  font-family: var(--font-header);
  font-size: 1.4rem;
  font-weight: 700;
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 28px;
  cursor: pointer;
  transition: color 0.2s;
  line-height: 1;
}

.close-btn:hover {
  color: var(--accent-magenta);
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-main);
}

.modal-body h3 {
  font-family: var(--font-header);
  font-size: 1.1rem;
  color: var(--accent-cyan);
  margin-top: 8px;
}

.modal-body ul, .modal-body ol {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.modal-body strong {
  color: var(--text-main);
}

/* Custom Webkit scrollbar for panels & body */
::-webkit-scrollbar {
  width: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: rgba(128, 128, 128, 0.15);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(128, 128, 128, 0.3);
}

/* Responsive styles */
@media (max-width: 900px) {
  .app-main {
    flex-direction: column;
    height: calc(100vh - 120px);
  }
  
  .controls-panel {
    width: 100%;
    height: 45%;
    border-left: none;
    border-top: 1px solid var(--panel-border);
    padding: 16px;
    gap: 16px;
  }
  
  .canvas-container {
    height: 55%;
  }

  .actions-group {
    margin-top: 12px;
  }

  footer {
    display: none; /* Hide footer on small mobile screens to conserve space */
  }
}