/**
 * GARGANTUA — Core CSS & Design System
 * Sci-Fi Glassmorphism, Modern Typography, Responsive Layout, and Animations
 */

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

:root {
  --bg-deep: #030408;
  --panel-bg: rgba(8, 12, 22, 0.72);
  --panel-border: rgba(0, 229, 255, 0.18);
  --panel-border-hover: rgba(0, 229, 255, 0.45);
  --panel-blur: blur(20px);
  
  --accent-cyan: #00e5ff;
  --accent-cyan-glow: rgba(0, 229, 255, 0.35);
  --accent-gold: #ffb300;
  --accent-gold-glow: rgba(255, 179, 0, 0.4);
  --accent-magenta: #ff007f;
  --accent-red: #ff3366;
  
  --text-main: #f0f4f8;
  --text-dim: #8b9bb4;
  --text-muted: #53637a;
  
  --font-ui: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Space Mono', 'SF Mono', Consolas, monospace;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-deep);
  color: var(--text-main);
  font-family: var(--font-ui);
  font-size: 14px;
}

#app-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

#blackhole-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 1;
}

/* --- Glassmorphism Base Styles --- */

.glass-card {
  background: var(--panel-bg);
  backdrop-filter: var(--panel-blur);
  -webkit-backdrop-filter: var(--panel-blur);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6), inset 0 0 16px rgba(0, 229, 255, 0.03);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.glass-card:hover {
  border-color: var(--panel-border-hover);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.7), inset 0 0 20px rgba(0, 229, 255, 0.06);
}

/* --- Loading / Splash Screen --- */

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: radial-gradient(circle at center, #090e1a 0%, #020306 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.6s ease;
}

.loading-overlay.fade-out {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-spinner-ring {
  position: relative;
  width: 90px;
  height: 90px;
  margin-bottom: 24px;
}

.loading-spinner-ring::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid transparent;
  border-top-color: var(--accent-gold);
  border-right-color: var(--accent-cyan);
  animation: spin 1.2s cubic-bezier(0.68, -0.55, 0.27, 1.55) infinite;
}

.loading-spinner-ring::after {
  content: '';
  position: absolute;
  inset: 12px;
  border-radius: 50%;
  background: #000;
  border: 1px solid var(--accent-gold);
  box-shadow: 0 0 20px var(--accent-gold-glow);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-title {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 6px;
  color: var(--text-main);
  text-shadow: 0 0 20px var(--accent-cyan-glow);
  margin-bottom: 8px;
}

.loading-subtitle {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--accent-cyan);
  opacity: 0.85;
}

/* --- Control Panel (Right Drawer) --- */

.control-panel {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 350px;
  max-height: calc(100vh - 32px);
  z-index: 20;
  display: flex;
  flex-direction: column;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

.control-panel.collapsed {
  transform: translateX(390px);
  opacity: 0;
  pointer-events: none;
}

.gui-tab-toggle {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 15;
  background: var(--panel-bg);
  backdrop-filter: var(--panel-blur);
  border: 1px solid var(--accent-cyan);
  color: var(--accent-cyan);
  padding: 8px 16px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0, 229, 255, 0.25);
  transition: all 0.2s ease;
}

.gui-tab-toggle:hover {
  background: var(--accent-cyan);
  color: #000;
  box-shadow: 0 0 20px var(--accent-cyan-glow);
}

.gui-tab-toggle.hidden {
  display: none;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--accent-cyan);
}

.panel-glow-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

.panel-toggle-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s;
}

.panel-toggle-btn:hover {
  color: var(--text-main);
}

.panel-scroll-area {
  padding: 14px 18px 48px 18px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 229, 255, 0.3) transparent;
}

.panel-scroll-area::-webkit-scrollbar {
  width: 4px;
}

.panel-scroll-area::-webkit-scrollbar-thumb {
  background: rgba(0, 229, 255, 0.3);
  border-radius: 4px;
}

/* Sections */

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

.section-title {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.2px;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* Grids & Buttons */

.preset-buttons-grid,
.quality-buttons-grid,
.action-buttons-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.quality-buttons-grid {
  grid-template-columns: 1fr 1fr 1fr;
}

.btn-preset,
.btn-quality,
.btn-action {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 6px;
  padding: 8px 10px;
  color: var(--text-dim);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-align: center;
}

.btn-preset:hover,
.btn-quality:hover,
.btn-action:hover {
  background: rgba(0, 229, 255, 0.08);
  border-color: var(--accent-cyan);
  color: var(--text-main);
}

.btn-preset.active,
.btn-quality.active,
.btn-action.active {
  background: rgba(0, 229, 255, 0.16);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.2);
  font-weight: 700;
}

.btn-action.primary {
  background: rgba(0, 229, 255, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.btn-action.primary:hover {
  background: var(--accent-cyan);
  color: #000;
  box-shadow: 0 0 16px var(--accent-cyan-glow);
}

/* Accordions & Parameter Groups */

.control-accordion {
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: rgba(12, 18, 30, 0.7);
  overflow: visible;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.control-accordion:hover {
  border-color: rgba(0, 229, 255, 0.35);
  background: rgba(16, 24, 40, 0.85);
}

.control-accordion.active {
  border-color: rgba(0, 229, 255, 0.45);
  background: rgba(10, 16, 28, 0.92);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
}

.accordion-header {
  padding: 11px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.2px;
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.04);
  border-radius: 7px;
  user-select: none;
  transition: background 0.2s, color 0.2s;
}

.accordion-header:hover {
  background: rgba(0, 229, 255, 0.12);
  color: var(--accent-cyan);
}

.control-accordion.active .accordion-header {
  color: var(--accent-cyan);
  background: rgba(0, 229, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.accordion-icon {
  font-size: 14px;
  font-weight: 800;
  color: var(--accent-cyan);
  transition: transform 0.2s ease;
}

.accordion-body {
  display: none;
  padding: 14px 14px 16px 14px;
  flex-direction: column;
  gap: 12px;
}

.control-accordion.active > .accordion-body {
  display: flex !important;
}

/* Form Controls & Sliders */

.select-field {
  width: 100%;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  padding: 8px 10px;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  cursor: pointer;
  outline: none;
}

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

.control-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.control-row label {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-dim);
}

.control-row label .val {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  font-weight: 700;
}

/* Custom Slider */

input[type=range].slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type=range].slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan-glow);
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

input[type=range].slider::-webkit-slider-thumb:hover {
  transform: scale(1.3);
  box-shadow: 0 0 14px var(--accent-cyan);
}

/* --- Help / Keybindings Modal --- */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  transition: opacity 0.25s ease;
}

.modal-backdrop.hidden {
  opacity: 0;
  pointer-events: none;
}

.modal-card {
  width: 100%;
  max-width: 680px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 12px;
}

.modal-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent-cyan);
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 20px;
  cursor: pointer;
  line-height: 1;
}

.modal-close-btn:hover {
  color: var(--text-main);
}

.modal-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

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

.modal-subhead {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--accent-gold);
  margin-bottom: 4px;
}

.key-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11.5px;
  color: var(--text-dim);
}

kbd {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--accent-cyan);
  min-width: 24px;
  text-align: center;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.5);
}

.modal-footer {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-muted);
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 12px;
}

/* --- Responsive Adjustments --- */

@media (max-width: 860px) {
  .control-panel {
    width: 300px;
  }
  .modal-grid {
    grid-template-columns: 1fr;
  }
}