/* ==========================================================================
   SNAKE SURGE / WORM - DESIGN SYSTEM & STYLESHEET
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;600;800;900&family=Press+Start+2P&family=Space+Grotesk:wght@500;700&display=swap');

:root {
  /* Default Cyber Neon Palette */
  --bg-primary: #0a0c16;
  --bg-secondary: #121629;
  --bg-glass: rgba(18, 22, 41, 0.75);
  --border-glass: rgba(255, 255, 255, 0.12);
  
  --accent-cyan: #00f0ff;
  --accent-magenta: #ff007f;
  --accent-lime: #39ff14;
  --accent-gold: #ffd700;
  --accent-purple: #9d4edd;

  --snake-head-color: #00f0ff;
  --snake-body-color: #00b4d8;
  --food-color: #ff007f;
  --grid-line-color: rgba(0, 240, 255, 0.05);

  --text-main: #f8f9fa;
  --text-muted: #94a3b8;
  
  --font-main: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-retro: 'Press Start 2P', monospace;
  --font-mono: 'Space Grotesk', monospace;

  --glow-cyan: 0 0 15px rgba(0, 240, 255, 0.6);
  --glow-magenta: 0 0 15px rgba(255, 0, 127, 0.6);
  --glow-lime: 0 0 15px rgba(57, 255, 20, 0.6);
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

/* Theme 2: Nokia 3310 Monocolor LCD */
[data-theme="nokia"] {
  --bg-primary: #9bbc0f;
  --bg-secondary: #8bac0f;
  --bg-glass: rgba(139, 172, 15, 0.9);
  --border-glass: rgba(15, 56, 15, 0.4);

  --accent-cyan: #0f380f;
  --accent-magenta: #306230;
  --accent-lime: #0f380f;
  --accent-gold: #306230;
  --accent-purple: #0f380f;

  --snake-head-color: #0f380f;
  --snake-body-color: #306230;
  --food-color: #0f380f;
  --grid-line-color: rgba(15, 56, 15, 0.15);

  --text-main: #0f380f;
  --text-muted: #306230;
  --font-main: 'Press Start 2P', monospace;

  --glow-cyan: none;
  --glow-magenta: none;
  --glow-lime: none;
}

/* Nokia Scanlines Effect */
[data-theme="nokia"] .game-viewport::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background: linear-gradient(
    rgba(15, 56, 15, 0) 50%,
    rgba(15, 56, 15, 0.1) 50%
  );
  background-size: 100% 4px;
  z-index: 10;
}

/* Theme 3: Midnight OLED */
[data-theme="oled"] {
  --bg-primary: #000000;
  --bg-secondary: #0a0a0a;
  --bg-glass: rgba(15, 15, 15, 0.85);
  --border-glass: rgba(255, 255, 255, 0.15);

  --accent-cyan: #38bdf8;
  --accent-magenta: #f43f5e;
  --accent-lime: #4ade80;
  --accent-gold: #facc15;
  --accent-purple: #a855f7;

  --snake-head-color: #38bdf8;
  --snake-body-color: #0284c7;
  --food-color: #f43f5e;
  --grid-line-color: rgba(255, 255, 255, 0.04);

  --text-main: #ffffff;
  --text-muted: #64748b;

  --glow-cyan: 0 0 10px rgba(56, 189, 248, 0.4);
  --glow-magenta: 0 0 10px rgba(244, 63, 94, 0.4);
  --glow-lime: 0 0 10px rgba(74, 222, 128, 0.4);
}

/* Reset & Global */
*, *::before, *::after {
  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-primary);
  color: var(--text-main);
  font-family: var(--font-main);
  transition: background-color 0.4s ease, color 0.4s ease;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* Background Animated Gradient Mesh */
.bg-ambient {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.bg-ambient .orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.25;
  animation: orbFloat 20s infinite ease-in-out alternate;
}

.bg-ambient .orb-1 {
  width: 450px;
  height: 450px;
  background: var(--accent-cyan);
  top: -100px;
  left: -100px;
}

.bg-ambient .orb-2 {
  width: 500px;
  height: 500px;
  background: var(--accent-magenta);
  bottom: -150px;
  right: -100px;
  animation-delay: -7s;
}

.bg-ambient .orb-3 {
  width: 350px;
  height: 350px;
  background: var(--accent-purple);
  top: 40%;
  left: 60%;
  animation-delay: -14s;
}

@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(60px, 40px) scale(1.15); }
  100% { transform: translate(-40px, 80px) scale(0.9); }
}

/* Application Layout Container */
#app-container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1100px;
  height: 100vh;
  max-height: 900px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Header & Navigation Bar */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

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

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-magenta));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--glow-cyan);
  font-size: 20px;
}

.logo-title {
  font-weight: 900;
  font-size: 1.4rem;
  letter-spacing: -0.5px;
  background: linear-gradient(90deg, #fff, var(--text-muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-title .badge {
  font-size: 0.65rem;
  font-family: var(--font-mono);
  background: var(--accent-magenta);
  -webkit-text-fill-color: #fff;
  padding: 2px 8px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-icon {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all 0.2s ease;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
  border-color: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
}

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

/* Main Game Workspace Area */
main {
  flex: 1;
  display: flex;
  gap: 16px;
  position: relative;
  min-height: 0;
}

/* Left/Center Canvas Viewport */
.game-viewport {
  flex: 1;
  position: relative;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

/* Canvas Element */
#game-canvas {
  background: transparent;
  display: block;
  border-radius: var(--radius-md);
  image-rendering: pixelated;
  cursor: crosshair;
}

/* HUD Overlay on Top of Canvas */
.hud-overlay {
  position: absolute;
  top: 16px;
  left: 20px;
  right: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  pointer-events: none;
  z-index: 5;
}

.hud-card {
  background: rgba(10, 12, 22, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  min-width: 100px;
}

.hud-label {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.hud-value {
  font-size: 1.3rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  text-shadow: var(--glow-cyan);
}

.surge-meter-wrapper {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 140px;
}

.surge-bar-bg {
  width: 100%;
  height: 10px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border-glass);
}

.surge-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-lime));
  box-shadow: var(--glow-lime);
  transition: width 0.2s ease;
}

.surge-ready {
  animation: pulseSurge 0.8s infinite alternate;
}

@keyframes pulseSurge {
  0% { filter: brightness(1); }
  100% { filter: brightness(1.5); }
}

/* Sidebar Info Panel (Desktop) */
.sidebar-panel {
  width: 280px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.panel-section-title {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.mode-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.2s ease;
  font-family: var(--font-main);
  text-align: left;
}

.mode-btn .mode-name {
  font-weight: 700;
  font-size: 0.95rem;
}

.mode-btn .mode-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.mode-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.3);
}

.mode-btn.active {
  background: rgba(0, 240, 255, 0.12);
  border-color: var(--accent-cyan);
  box-shadow: var(--glow-cyan);
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

/* Fever Mode Canvas CSS */
.fever-active {
  animation: feverPulse 0.4s infinite alternate;
  box-shadow: 0 0 40px var(--accent-magenta), 0 0 80px var(--accent-cyan) !important;
}

@keyframes feverPulse {
  0% { transform: translate(-50%, -50%) scale(1); }
  100% { transform: translate(-50%, -50%) scale(1.02); }
}

.stat-item {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 10px;
  display: flex;
  flex-direction: column;
}

.stat-val {
  font-size: 1.1rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-lime);
}

.stat-lbl {
  font-size: 0.68rem;
  color: var(--text-muted);
}

/* Modals & Overlays */
.overlay-screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(10, 12, 22, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 20;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

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

.overlay-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 32px;
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  transform: translateY(20px);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.overlay-screen.active .overlay-card {
  transform: translateY(0);
}

.overlay-title {
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #fff, var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), #00a8ff);
  color: #040914;
  border: none;
  font-weight: 800;
  font-size: 1.1rem;
  padding: 14px 32px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--glow-cyan);
  transition: all 0.2s ease;
  width: 100%;
  justify-content: center;
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  filter: brightness(1.15);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  font-weight: 700;
  padding: 12px 24px;
  border-radius: 12px;
  cursor: pointer;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.16);
}

/* Mobile Virtual Touch Controls */
.mobile-controls {
  display: none;
  position: absolute;
  bottom: 20px;
  left: 0;
  right: 0;
  padding: 0 20px;
  justify-content: space-between;
  align-items: flex-end;
  pointer-events: none;
  z-index: 10;
}

@media (max-width: 900px) {
  .sidebar-panel {
    display: none;
  }
  .mobile-controls {
    display: flex;
  }
}

.d-pad {
  width: 130px;
  height: 130px;
  position: relative;
  pointer-events: all;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  touch-action: none; /* Prevent scroll on touch */
}

/* Virtual Joystick knob styling (added dynamically) */
.joystick-knob {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), #00a8ff);
  position: absolute;
  top: 40px;
  left: 40px;
  box-shadow: var(--glow-cyan);
  pointer-events: none;
  transition: transform 0.1s;
}

/* Hide legacy d-pad buttons since we will use virtual joystick */
.d-btn {
  display: none;
}

.surge-touch-btn {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-magenta), var(--accent-purple));
  border: 2px solid var(--accent-cyan);
  color: #fff;
  font-weight: 900;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: all;
  box-shadow: var(--glow-magenta);
  touch-action: manipulation;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 100;
  pointer-events: none;
}

.toast {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--accent-gold);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), var(--glow-lime);
  animation: slideToast 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), fadeOutToast 0.4s ease 3.6s forwards;
}

@keyframes slideToast {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes fadeOutToast {
  to { opacity: 0; transform: translateY(10px); }
}