/* Reset & base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Arial', sans-serif;
}

body {
  background: url(background.png);
  color: #fff;
  height: 100vh;
  overflow-x: hidden;
  /* background-image: url("background.png"); */
  background-size: cover;          /* Cover the whole screen */
  background-position: center;     /* Center the image */
  background-repeat: no-repeat;    /* Don’t tile */
  background-attachment: fixed;    /* Fix background on scroll */
}

/* Main layout */
.main-container {
  display: flex;
  height: 100%;
}

/* ========== Navbar ========== */
.navbar {
  position: relative;
  top: 1rem;
  background: transparent;
  margin-top: 10px;
  padding: 20px 20px;
  display: flex;
  justify-content: space-evenly;
  align-items: center;
 height: 60px;
 width: 100vw;
}

.nav-links a {
  color: #f0f0f0;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.2rem;
  padding: 8px 16px; /* so background is visible */
  border-radius: 20px;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

/* Glassy + Glossy 3D Hover */
.nav-links a:hover {
  color: #fff;
  background: transparent; /* semi-transparent glass look */
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 
     0 2px 10px rgba(255, 255, 255, 0.167), /* soft shadow under */
    inset 0 2px 3px rgba(116, 106, 204, 0.753); /* inner glossy shine */
  transform: translateY(-3px); /* subtle 3D lift */
}

/* Sidebar */
.sidebar {
  width: 250px;
  background: rgba(30,30,40,0.95);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 15px;
  border-right: 1px solid rgba(255,255,255,0.1);
  margin-top: 1.4rem;
  border-radius: 15px;
}

.sidebar h2 {
  color: #3E98FF;
  margin-bottom: 10px;
}

.slider-container label {
  display: block;
  font-size: 14px;
  margin-bottom: 5px;
}

input[type=range] {
  width: 100%;
}

.sidebar-buttons {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
}

.sidebar button {
  padding: 8px 12px;
  border: none;
  border-radius: 6px;
  background: #3E98FF;
  color: #fff;
  cursor: pointer;
  transition: 0.3s;
}

.sidebar button:hover {
  background: #5AB3FF;
}

/* Right content */
.right-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 20px;
}

/* Glassy card */
.card {
  background: rgba(30,30,40,0.85);
  padding: 20px;
  border-radius: 15px;
  box-shadow: 0 0 15px rgba(0,0,0,0.5);
  transition: transform 0.5s ease, opacity 0.5s ease;
}

/* Canvas container with corner badge */
.canvas-container {
  position: relative;
  width: 100%;
}

#impactCanvas {
  width: 100%;
  height: 200px;
  border-radius: 10px;
  background: rgba(0,0,0,0.2);
  /* Ensure logical canvas size matches visuals and add vignette */
.canvas-container {
  position: relative;
  width: 100%;
  overflow: hidden;
}

#impactCanvas {
  width: 100%;
  height: 200px; /* unchanged visual size */
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(6,12,30,0.35), rgba(2,6,12,0.5));
  box-shadow: inset 0 30px 60px rgba(0,0,0,0.45), 0 8px 30px rgba(0,0,0,0.6);
  display: block;
}

/* subtle vignette around the canvas */
.canvas-container::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: 10px;
  background: radial-gradient(ellipse at center, rgba(0,0,0,0) 40%, rgba(0,0,0,0.35) 100%);
}

}

.corner-badge {
  position: absolute;
  top: 5px;
  right: 5px;
  background: rgba(62,152,255,0.7);
  padding: 5px 10px;
  border-radius: 8px;
  font-size: 12px;
  color: #fff;
  box-shadow: 0 0 10px rgba(62,152,255,0.6);
  animation: glow 1.5s infinite alternate;
}

@keyframes glow {
  0% { box-shadow: 0 0 5px rgba(62,152,255,0.3); }
  100% { box-shadow: 0 0 15px rgba(62,152,255,0.9); }
}

/* Quiz */
.quiz-container {
  overflow: hidden;
  position: relative;
  height: 150px;
}

.quiz-question {
  min-width: 100%;
  transition: transform 0.5s ease;
  position: absolute;
  top: 0;
  left: 0;
}

.quiz-question h3 {
  color: #3E98FF;
  margin-bottom: 10px;
}

.quiz-question button {
  display: block;
  width: 100%;
  padding: 8px;
  margin: 5px 0;
  border: none;
  border-radius: 6px;
  background: #1E1E1E;
  color: #fff;
  cursor: pointer;
  transition: 0.3s;
}

.quiz-question button:hover {
  background: #3E98FF;
}

/* Navigation buttons */
.quiz-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
}

.quiz-nav button {
  padding: 8px 12px;
  border: none;
  border-radius: 6px;
  background: #3E98FF;
  color: #fff;
  cursor: pointer;
  transition: 0.3s;
}

.quiz-nav button:hover {
  background: #5AB3FF;
}

/* Info popup */
.info-popup {
  display: none;
  position: fixed;
  top:0;
  left:0;
  width: 100%;
  height:100%;
  background: rgba(0,0,0,0.7);
  justify-content: center;
  align-items: center;
}

.info-content {
  background: rgba(30,30,40,0.95);
  padding: 20px;
  border-radius: 12px;
  width: 300px;
  position: relative;
}

#closePopup {
  position: absolute;
  top: 8px;
  right: 12px;
  cursor: pointer;
  font-size: 18px;
  color: #fff;
}