* { 
  box-sizing: border-box; 
  margin: 0; 
  padding: 0; 
}

body {
  background: linear-gradient(120deg,#0f172a 0%, #0b3b46 50%, #05263a 100%);
  min-height: 100vh;
  margin: 0;
  font-family: "Poppins", sans-serif;
  color: #fff;
  text-align: center;
  overflow-x: hidden;
  padding-top: 80px; 
}

/* ===== HEADER ===== */
.header {
  position: fixed;   /* 🔥 fix header */
  top: 10px;
  margin-left: 18px;
  left: 0;
  width: 98%;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border-bottom-left-radius: 25px;
  border-top-right-radius: 25px;
  background: linear-gradient(135deg, rgba(255,255,255,0.14), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.4);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  box-shadow: 0 6px 10px rgba(2, 6, 23, 0.45);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: 40px;
  text-decoration: none;
  color: white;
  font-weight: 700;
  letter-spacing: .2px;
}
.logo .mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(255,255,255,0.14), rgba(255,255,255,0.02));
  display:flex; align-items:center; justify-content:center;
  font-weight:800; color:#fff;
  box-shadow: 0 4px 10px rgba(2,6,23,0.4) inset;
  border: 1px solid rgba(255,255,255,0.1);
  font-size: 16px;
}

/* General link styling */
a {
  color: rgba(255, 255, 255, 0.85); /* semi-transparent white */
  text-decoration: none; /* remove underline */
  font-weight: 500;
  transition: all 0.3s ease;
}

a:hover {
  color: #ffffff; /* full white on hover */
  text-shadow: 0 0 8px rgba(255,255,255,0.6);
  transform: scale(1.05); /* subtle zoom effect */
}

a:active {
  color: #ffd700; /* gold color on click */
}



/* ===== MAIN CONTENT ===== */
h1 {
  font-size: 2.5rem;
  margin-top: 20px;
  margin-bottom: 8px;
  color: #00f0ff;
  text-shadow: 0 0 10px rgba(0,240,255,0.8);
}
p {
  font-size: 1.1rem;
  margin-bottom: 20px;
  color: rgba(255,255,255,0.85);
}

/* ===== GRID 4x4 ===== */
.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
  padding: 30px;
  max-width: 1100px;
  margin: 0 auto;
}


.theme-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 16px;
  padding: 30px 10px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  box-shadow: 0 6px 14px rgba(0,0,0,0.4);
}
#design1357{
  border-bottom-left-radius: 50px;
  border-top-right-radius: 50px;
}
#design2468{
  border-top-left-radius: 50px;
  border-bottom-right-radius: 50px;
}

.theme-card h2 {
  color: #fff;
  font-size: 1.3rem;
}
.theme-card:hover {
  transform: translateY(-6px) scale(1.05);
  box-shadow: 0 10px 20px rgba(0,240,255,0.4);
  border-color: #00f0ff;
}



/* Dark Glassmorphism Quiz Container */
#quiz-container {
  margin: 40px auto;
  padding: 25px;
  max-width: 1000px;
  background: rgba(30, 41, 59, 0.4);   /* semi-transparent dark */
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  color: #f1f5f9;
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
  text-align: center;
  font-family: "Poppins", sans-serif;
  transition: 0.3s ease;
  border: 1px solid rgba(255,255,255,0.1);
}

/* Question Text */
#quiz-container h2 {
  font-size: 1.7rem;
  margin-bottom: 20px;
  color: white; /* sky blue */
  text-shadow: 0 0 8px rgba(56, 189, 248, 0.7);
}

/* Options */
#quiz-container .option {
  display: block;
  width: 100%;
  margin: 12px 0;
  padding: 14px;
  background: rgba(51, 65, 85, 0.6);
  color: #f1f5f9;
  font-size: 1rem;
  font-weight: 500;
  border: 1px solid rgba(148,163,184,0.3);
  border-radius: 12px;
  cursor: pointer;
  transition: 0.3s ease;
  backdrop-filter: blur(8px);
}

#quiz-container .option:hover {
  background: rgba(56, 189, 248, 0.2);
  border: 1px solid #38bdf8;
  color: #38bdf8;
  box-shadow: 0 0 12px rgba(56,189,248,0.5);
  transform: translateY(-2px);
}

/* Restart Button */
#quiz-container button {
  margin-top: 20px;
  padding: 12px 24px;
  background: rgba(16, 185, 129, 0.8); /* emerald green */
  color: white;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  font-weight: bold;
  font-size: 1rem;
  transition: 0.3s ease;
  backdrop-filter: blur(8px);
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.6);
}

#quiz-container button:hover {
  background: rgba(5, 150, 105, 0.9);
  box-shadow: 0 0 18px rgba(16, 185, 129, 0.8);
  transform: scale(1.05);
}


/* Input Box (for personality chat type) */
.input-box {
  width: 100%;
  padding: 12px;
  font-size: 16px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(148,163,184,0.3);
  border-radius: 12px;
  color: #f1f5f9;
  outline: none;
  transition: 0.3s;
  text-align: center;
  backdrop-filter: blur(8px);
}

.input-box:focus {
  border: 1px solid #38bdf8;
  box-shadow: 0 0 12px rgba(56,189,248,0.6);
}


footer {
  position: fixed;       /* fix footer at bottom */
  bottom: 10px;
  left: 0;
  width: 98%;
  margin-left: 18px;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border-top-left-radius: 25px;
  border-bottom-right-radius: 25px;
  background: linear-gradient(135deg, rgba(255,255,255,0.14), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.4);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  box-shadow: 0 -6px 10px rgba(2, 6, 23, 0.45);
}





/* ===== MEDIA QUERIES ===== */

/* Small devices (mobile portrait) */
@media (max-width: 480px) {
  body {
    padding-top: 60px;
  }

  .header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 10px 12px;
  }

  .logo {
    margin-left: 0;
    font-size: 14px;
  }
  .logo .mark {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }

  .grid {
    grid-template-columns:  repeat(2, 1fr);
    gap: 15px;
    padding: 15px;
  }

  h1 {
    font-size: 2rem;
  }
  p {
    font-size: 1rem;
  }

  #quiz-container {
    padding: 20px;
    margin: 20px 10px;
  }

  #quiz-container h2 {
    font-size: 1.4rem;
  }

  #quiz-container .option {
    font-size: 0.95rem;
    padding: 12px;
  }

  #quiz-container button {
    font-size: 0.95rem;
    padding: 10px 20px;
  }
}

/* Medium devices (mobile landscape / small tablets) */
@media (max-width: 768px) {
  body {
    padding-top: 70px;
  }

  .grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    padding: 20px;
  }

  h1 {
    font-size: 2.2rem;
  }
  p {
    font-size: 1rem;
  }

  #quiz-container {
    padding: 22px;
  }

  #quiz-container h2 {
    font-size: 1.5rem;
  }

  #quiz-container .option {
    font-size: 1rem;
    padding: 12px;
  }

  #quiz-container button {
    font-size: 1rem;
    padding: 11px 22px;
  }
}

/* Large tablets / small desktops */
@media (max-width: 1024px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }

  h1 {
    font-size: 2.4rem;
  }

  #quiz-container {
    padding: 24px;
  }
}