*{
  margin: 0; padding: 0;
  box-sizing: border-box;
  outline: none;
}

body{
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100vh;
  background: #f3f4f6;
  transition: background .5s;
}

body.dark{
  background: #0f172a;
}

.clock-container{
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.clock-card{
  width: 100%;
  max-width: 32.5rem;
  padding: 2.5rem;
  border-radius: 1.25rem;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  transition: background .5s, box-shadow .5s;
}

body.dark .clock-card{
  background: rgba(30, 41, 59, 0.4);
  border-color: rgba(51, 65, 85, 0.5);
  box-shadow: 0 25px 50px rgba(79, 70, 229, 0.2);
}

.clock-header{
  text-align: center;
  margin-bottom: 2.5rem;
}

.clock-header h1{
  font-size: 0.75rem;
  letter-spacing: 0.25rem;
  text-transform: uppercase;
  font-weight: 300;
  color: #6b7280;
}

body.dark .clock-header h1{
  color: #94a3b8;
}

.clock{
  text-align: center;
  margin-bottom: 2rem;
}

.time{
  font-family: "Orbitron", monospace;
  font-size: clamp(3.5rem, 6vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.02rem;
  color: #111827;
  margin-bottom: 0.75rem;
  transition: color 0.3s;
}

body.dark .time{
  color: #f8fafc;
  text-shadow: 0 0 20px rgba(129, 140, 248, 0.3);
}

.ampm{
  font-family: "Orbitron", monospace;
  font-size: 1.5rem;
  font-weight: 500;
  margin-top: 0.5rem;
  color: #6366f1;
}

.date{
  margin-top: 1.5rem;
  font-size: 0.95rem;
  letter-spacing: 0.05rem;
  color: #6b7280;
}

body.dark .date{
  color: #94a3b8;
}

.hidden{
  display: none;
}

.controls{
  display: flex;
  gap: 0.75rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}

.btn{
  flex: 1;
  padding: 0.9rem 1.5rem;
  border-radius: 0.6rem;
  border: none;
  cursor: pointer;
  font-weight: 500;
  color: #fff;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn:hover{
  transform: scale(1.05);
}

.btn:active{
  transform: scale(0.95);
}

.primary {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  box-shadow: 0 10px 20px rgba(99, 102, 241, 0.35);
}

.primary:hover {
  background: linear-gradient(135deg, #818cf8, #6366f1);
}

.secondary {
  background: linear-gradient(135deg, #6366f1, #9333ea);
  box-shadow: 0 10px 20px rgba(147, 51, 234, 0.35);
}

.secondary:hover {
  background: linear-gradient(135deg, #818cf8, #a855f7);
}

@media (max-width: 40rem) {
  .clock-card {
    padding: 2rem 1.5rem;
  }
}