/* ============================================
   MAGNET GAME — 3D KIDS-APP UI SYSTEM
   Duolingo / Toca Boca Style 3D Glossy Buttons, Modals & Responsive Typography
   ============================================ */

:root {
  --font-family: 'Fredoka', 'Poppins', -apple-system, sans-serif;
  --bg-color: #0f172a;
  --text-color: #ffffff;

  /* 3D Color System */
  --blue-main: #0284c7;
  --blue-top: #38bdf8;
  --blue-bottom: #0369a1;
  --blue-border: #7dd3fc;
  --blue-shadow: rgba(3, 105, 161, 0.65);

  --green-main: #5cb811;
  --green-top: #8ae629;
  --green-bottom: #469a08;
  --green-border: #abf250;
  --green-shadow: rgba(35, 75, 5, 0.65);

  --yellow-main: #ca8a04;
  --yellow-top: #facc15;
  --yellow-bottom: #a16207;
  --yellow-border: #fef08a;
  --yellow-shadow: rgba(113, 63, 18, 0.65);

  --purple-main: #7c3aed;
  --purple-top: #a855f7;
  --purple-bottom: #6d28d9;
  --purple-border: #c084fc;
  --purple-shadow: rgba(88, 28, 135, 0.65);

  --red-main: #dc2626;
  --red-top: #f87171;
  --red-bottom: #991b1b;
  --red-border: #fca5a5;
  --red-shadow: rgba(153, 27, 27, 0.65);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
}

/* =================================================================
   1. APP HEADER WITH 3D BACK BUTTON & HEADING SPACING
   ================================================================= */
.game-app-header {
  position: relative;
  z-index: 50;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.98) 0%, rgba(30, 41, 59, 0.95) 100%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 3px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
  flex-shrink: 0;
}

/* 3D Glossy Arcade Back Button */
.app-back-btn {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  gap: 8px !important;
  padding: 6px 18px !important;
  background: linear-gradient(180deg, var(--blue-top) 0%, var(--blue-main) 55%, var(--blue-bottom) 100%) !important;
  color: #ffffff !important;
  border-radius: 50px !important;
  border: 3px solid var(--blue-border) !important;
  box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.85), 
              inset 0 -3.5px 0 var(--blue-shadow), 
              0 6px 14px rgba(2, 132, 199, 0.4) !important;
  font-family: var(--font-family) !important;
  font-size: 15px !important;
  font-weight: 800 !important;
  letter-spacing: 0.6px !important;
  text-transform: uppercase !important;
  text-decoration: none !important;
  text-shadow: 0 1.5px 2px rgba(0, 0, 0, 0.4) !important;
  position: relative !important;
  overflow: hidden !important;
  cursor: pointer !important;
  transition: all 0.12s ease !important;
  min-height: 40px !important;
  user-select: none !important;
  touch-action: manipulation !important;
}

.app-back-btn::before {
  content: '' !important;
  position: absolute !important;
  top: 2px !important;
  left: 8px !important;
  right: 8px !important;
  height: 38% !important;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.75) 0%, rgba(255, 255, 255, 0.1) 100%) !important;
  border-radius: 50px 50px 20px 20px !important;
  pointer-events: none !important;
}

.app-back-btn:hover {
  background: linear-gradient(180deg, #56c6f8 0%, #0390d9 55%, #0278b8 100%) !important;
  transform: translateY(-2px) !important;
  box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.95), 
              inset 0 -3.5px 0 var(--blue-shadow), 
              0 8px 18px rgba(2, 132, 199, 0.5) !important;
}

.app-back-btn:active {
  transform: translateY(3px) !important;
  box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.4), 
              inset 0 -1.5px 0 var(--blue-shadow), 
              0 3px 6px rgba(2, 132, 199, 0.3) !important;
}

.game-app-title {
  font-size: 18px;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: 0.6px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Canvas Container */
.canvas-container {
  flex-grow: 1;
  width: 100%;
  height: calc(100vh - 56px);
  position: relative;
  overflow: hidden;
  background: #0f172a;
}

#gameCanvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

/* =================================================================
   2. REUSABLE 3D GLOSSY ARCADE BUTTON STYLES
   ================================================================= */
.btn-3d,
button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  background: linear-gradient(180deg, var(--green-top) 0%, var(--green-main) 55%, var(--green-bottom) 100%);
  color: #ffffff;
  font-family: var(--font-family);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 50px;
  border: 3.5px solid var(--green-border);
  box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.85), 
              inset 0 -4px 0 var(--green-shadow), 
              0 6px 16px rgba(70, 154, 8, 0.45);
  text-shadow: 0 1.5px 2.5px rgba(0, 0, 0, 0.45);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.12s ease;
  user-select: none;
  touch-action: manipulation;
}

.btn-3d::before,
button::before,
.btn::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 10px;
  right: 10px;
  height: 38%;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.75) 0%, rgba(255, 255, 255, 0.1) 100%);
  border-radius: 50px 50px 20px 20px;
  pointer-events: none;
}

.btn-3d:hover,
button:hover,
.btn:hover {
  background: linear-gradient(180deg, #96f033 0%, #68cf15 55%, #4ea809 100%);
  box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.95), 
              inset 0 -4px 0 var(--green-shadow), 
              0 9px 22px rgba(70, 154, 8, 0.6);
  transform: translateY(-2px);
}

.btn-3d:active,
button:active,
.btn:active {
  transform: translateY(3px);
  box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.4), 
              inset 0 -2px 0 var(--green-shadow), 
              0 3px 8px rgba(70, 154, 8, 0.3);
}

/* Color Variants */
.btn-3d-blue,
.btn-secondary {
  background: linear-gradient(180deg, var(--blue-top) 0%, var(--blue-main) 55%, var(--blue-bottom) 100%) !important;
  border-color: var(--blue-border) !important;
  box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.85), 
              inset 0 -4px 0 var(--blue-shadow), 
              0 6px 14px rgba(2, 132, 199, 0.4) !important;
}

.btn-3d-yellow {
  background: linear-gradient(180deg, var(--yellow-top) 0%, var(--yellow-main) 55%, var(--yellow-bottom) 100%) !important;
  border-color: var(--yellow-border) !important;
  box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.85), 
              inset 0 -4px 0 var(--yellow-shadow), 
              0 6px 14px rgba(202, 138, 4, 0.4) !important;
}

.btn-3d-purple {
  background: linear-gradient(180deg, var(--purple-top) 0%, var(--purple-main) 55%, var(--purple-bottom) 100%) !important;
  border-color: var(--purple-border) !important;
  box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.85), 
              inset 0 -4px 0 var(--purple-shadow), 
              0 6px 14px rgba(124, 58, 237, 0.4) !important;
}

.btn-3d-red {
  background: linear-gradient(180deg, var(--red-top) 0%, var(--red-main) 55%, var(--red-bottom) 100%) !important;
  border-color: var(--red-border) !important;
  box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.85), 
              inset 0 -4px 0 var(--red-shadow), 
              0 6px 14px rgba(220, 38, 38, 0.4) !important;
}