* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

html, body {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: linear-gradient(135deg, #fafafa, #f5f3ff, #e0f2fe);
  color: #1f2937;
  line-height: 1.6;
  position: relative;
  overflow-x: hidden;
}

main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  position: relative;
  z-index: 1;
}

.container {
  max-width: 700px;
  margin: auto;
  z-index: 2;
  position: relative;
}

h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: #111827;
  text-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.tagline {
  font-size: 1.3rem;
  margin-bottom: 2.5rem;
  color: #4b5563;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

button {
  background: linear-gradient(to right, #8b5cf6, #3b82f6);
  color: white;
  border: none;
  padding: 20px 50px;
  font-size: 1.5rem;
  font-weight: 600;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 10px 25px rgba(139, 92, 246, 0.3);
  transition: transform 0.2s ease, opacity 0.2s ease, box-shadow 0.2s ease;
}

button:hover {
  transform: scale(1.07);
  opacity: 0.9;
  box-shadow: 0 15px 30px rgba(139, 92, 246, 0.4);
}

button:active {
  transform: scale(0.98);
}

.card {
  margin-top: 2.5rem;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  border-radius: 24px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.1);
  padding: 35px;
  max-width: 550px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeIn 0.5s ease forwards;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.label {
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 1px;
  color: #6b7280;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.problem {
  font-size: 1.4rem;
  margin-bottom: 1.8rem;
  color: #111827;
  font-weight: 500;
  line-height: 1.5;
}

.solution a {
  font-size: 1.5rem;
  color: #7c3aed;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s ease;
  padding: 4px 8px;
  border-radius: 8px;
  background: rgba(124, 58, 237, 0.1);
}

.solution a:hover {
  text-decoration: underline;
  background: rgba(124, 58, 237, 0.2);
}

.hidden { 
  display: none; 
}

footer {
  text-align: center;
  font-size: 0.9rem;
  color: #6b7280;
  padding: 1.2rem;
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(8px);
  position: relative;
  z-index: 2;
  border-top: 1px solid rgba(0,0,0,0.05);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Background circles */
.background {
  position: fixed;
  width: 100%;
  height: 100%;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.circle {
  position: absolute;
  border-radius: 50%;
  cursor: pointer;
  animation: float 15s linear infinite;
  pointer-events: auto;
  transition: transform 0.3s ease, opacity 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

@keyframes float {
  0% { transform: translateY(0) rotate(0); }
  50% { transform: translateY(-60px) rotate(180deg); }
  100% { transform: translateY(0) rotate(360deg); }
}

/* Explosion effect */
.explosion {
  position: absolute;
  pointer-events: none;
  z-index: 10;
}

.particle {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  animation: explode 0.6s ease-out forwards;
}

@keyframes explode {
  0% { transform: translate(0, 0); opacity: 1; }
  100% { transform: translate(var(--tx), var(--ty)); opacity: 0; }
}

/* Responsive design */
@media (max-width: 768px) {
  h1 { font-size: 2.5rem; }
  .tagline { font-size: 1.1rem; }
  button { padding: 16px 40px; font-size: 1.3rem; }
  .card { padding: 25px; margin-top: 2rem; }
  .problem { font-size: 1.2rem; }
  .solution a { font-size: 1.3rem; }
}

@media (max-width: 480px) {
  h1 { font-size: 2rem; }
  .tagline { font-size: 1rem; margin-bottom: 2rem; }
  button { padding: 14px 32px; font-size: 1.1rem; }
  .card { padding: 20px; }
}