:root{
  --bg:#f5f6fb;
  --ink:#1f2430;
  --muted:#6b7280;
  --line:#e5e7ef;
  --card:#ffffff;
  --chip:#f0f2f8;
  --accent:#3163ff;
  --accent-2:#1e3a8a;
  --shadow:0 8px 30px rgba(16,24,40,.08);
  --radius:16px;
}

/* Reset & base */
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; 
  font:16px/1.6 "Poppins", ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  color:white; background:var(--bg);
  box-sizing: border-box;
  display: relative;
}

body::before {
  content: "";
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: url("1. HOMEPAGE/photo/background.webp") no-repeat center center / cover;
  opacity: 90%; /* adjust transparency here */
  z-index: -1; /* keeps it behind content */
}


/* Subtle animated gradient bg overlay */
.bg{
  position:fixed; inset:0;
  background:
    radial-gradient(1200px 600px at 80% 10%, rgba(0,123,255,.06), transparent 60%),
    radial-gradient(800px 400px at 10% 90%, rgba(32,201,151,.08), transparent 60%);
  pointer-events:none;
  animation:bgFloat 12s ease-in-out infinite alternate;
  z-index:-1;
}
@keyframes bgFloat{
  from{transform:translateY(0)}
  to{transform:translateY(-12px)}
}

/* Topbar */
.topbar {
  margin: 0 auto;
  position: relative;
  top: 40px;
  z-index: 40;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(25px);
  width: 80%;
}

.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100px;
  max-width: 1140px;
  width: 90%;
  margin: 0 auto;
}

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

.brand__logo {
  width: 250px;
  height: auto;
}

/* Desktop nav */
.nav {
  display: flex;
  gap: 24px;
}

.nav__link {
  color: #fff;
  text-decoration: none;
  transition: color 0.3s ease;  
  cursor:pointer;
}

.nav__link:hover {
  color: var(--bpPrimary-200);
}

/* Hamburger button (hidden on desktop) */
.hamburger {
  display: none;
  width: 42px;
  height: 38px;
  background: none;
  position: relative;
  border: none;
  cursor: pointer;
}

.hamburger-line {
  position: absolute;
  left: 8px;
  height: 2px;
  background: #e9e9e9;
  border-radius: 2px;
  width: 26px;
  transition: all 0.3s ease;
}

.hamburger-line:nth-child(1) { top: 10px; }
.hamburger-line:nth-child(2) { top: 18px; }
.hamburger-line:nth-child(3) { top: 26px; }

.hamburger.active .hamburger-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
}
.hamburger.active .hamburger-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile menu (hidden by default) */
.mobile {
  display: none;
  flex-direction: column;
  width: 90%;
  margin: 10px auto 0;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: all 0.4s ease;
}

.mobile.open {
  max-height: 500px;
  opacity: 1;
  height: 310px;
}

.mobile.show {
display: flex;
}

.mobile .nav__link {
  display: block;
  padding: 12px 20px;
  color: white;
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.mobile .nav__link:hover {
  background: rgba(255,255,255,0.15);
}

/* Responsive */
@media (max-width: 1203px) {
  .nav.top-nav {
    display: none;
  }
  .hamburger {
    display: block; right: 10px;
  }
  .mobile {
    display: flex;
  }
  .topbar__inner{width: max-content;}
}


  @media (max-width: 480px) {
    .topbar__inner{width: max-content;}
  }

    @media (max-width: 344px) {
  .topbar {width: max-content;}
  }

#mainimage {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 20px;
}




/* Screens */
main{max-width:1100px; margin:0 auto; padding:24px}
.screen{display:none; animation:fadeIn .4s ease; margin-top: 80px;background: rgba(255, 255, 255, 0.05);
border-radius: 20px;
box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
backdrop-filter: blur(20px);
padding: 20px;
}
.screen.active{display:block;}
@keyframes fadeIn{from{opacity:0; transform:translateY(6px)} to{opacity:1; transform:none}}

/* Card */
.card{
  padding: 20px;
}

.menu-actions{display:flex; gap:12px; flex-wrap:wrap; margin-top:20px; justify-content: center;}

/* Buttons */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:10px 16px; border-radius:10px; background-color: rgba(255, 255, 255, 0.05);
  text-decoration:none; font-weight:600;color: white;border: none;
  transition:transform 0.3s, box-shadow 0.3s; justify-self: center; cursor: pointer;
}
.btn:hover{transform:translateY(-2px)}
.btn.ghost{background:#eef4ff; color:var(--text)}
.btn.primary{background: linear-gradient(180deg, #5b84ff, #3866ff);color: #fff;width: 130px;height: 50px;border-color: #3866ff;font-size: medium;}
.btn.danger{background:linear-gradient(135deg,#ff6b6b,#ff4d4f)}

/* Howto */
.howto-list{margin:8px 0 0 18px;}
.howto-list li{margin:12px 0}
.legend{padding:2px 8px; border-radius:8px}
.legend.correct{background:#e6fffa; color:#0f766e}
.legend.wrong{background:#fff1f0; color:#a8071a}

/* HUD */
.hud{
  display:grid; grid-template-columns: 120px 1fr repeat(2,120px);
  align-items:center; gap:14px; margin-bottom:14px; background-color: rgba(255, 255, 255, 0.05);
border-radius: 20px;
box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
padding: 20px;
}
.hud-group{display:flex; flex-direction:column; align-items:flex-start; margin: 0 auto;}
.label{font-size:.8rem;}
.value{
  font-family:'Orbitron',sans-serif; font-weight:700; font-size:1.1rem
}
.timer .value{color:#ef4444}

.progress-wrap{
  background:#eef3ff; border-radius:999px; height:12px; overflow:hidden; border:1px solid rgba(0,0,0,.06)
}
.progress{
  height:100%; width:0%;
  background:linear-gradient(90deg, var(--accent), #7cf2c9);
  transition: width .3s ease;
}

/* Quiz */
.quiz-card h3{margin-bottom: 40px; font-size:clamp(1.1rem, 2.2vw, 1.4rem)}
.options{display:grid; gap:10px; width: 90%;}
.option{
  background:#f7faff; border:1px solid #e5eeff; border-radius:14px; padding:14px;
  text-align:left; cursor:pointer;color:rgb(27, 27, 27);
  transition:.2s; position:relative; overflow:hidden; font-size: large;
}
.option:hover{transform:translateY(-2px); box-shadow:0 10px 20px rgba(0,0,0,.06)}
.option.correct{background:#e8fff7; border-color:#00ffa2}
.option.wrong{background:#fff0f0; border-color:#ff4545}
.option.disabled{pointer-events:none; opacity:.8}
.option .tag{
  position:absolute; right:12px; top:12px; font-size:.75rem; color:#8091a7
}

.info{min-height:22px; margin-top:20px;}
.actions{display:flex; gap:10px; justify-content:space-between; margin-top:10px}

/* Result */
.result-card{text-align:center; position:relative}
#confetti{position:absolute; inset:0; pointer-events:none}
#final-score{font-size:1.2rem; margin:6px 0 14px}
.save-form{display:flex; gap:10px; justify-content:center; flex-wrap:wrap}
.save-form input{
  padding:12px 14px; border-radius:12px; border:1px solid #e5eaf5; min-width:220px; outline:none
}

/* Leaderboard */
.board{margin:0; padding: 0px;}
.board li{
  margin:8px 0; font-weight:700;
  background:#f6f9ff; border:1px solid #e8efff; border-radius:10px; padding:10px 12px;
  display:flex; justify-content:space-between; color:#0f172a; gap: 50px;
}

/* Responsive */
@media (max-width: 768px){
  .hud{grid-template-columns: 1fr 1fr; gap:10px}
  .hud-group{margin: 0;}
  .progress-wrap{grid-column:1/3}
}