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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f0f4f8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: linear-gradient(135deg, #1a365d 0%, #2c5282 100%);
  color: white;
  text-align: center;
  padding: 20px 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

header h1 { font-size: 1.6rem; font-weight: 700; }
header p  { font-size: 0.9rem; opacity: 0.8; margin-top: 4px; }

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  gap: 20px;
}

.pin-card {
  background: white;
  border-radius: 20px;
  padding: 36px 32px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.1);
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.navodilo {
  font-size: 1rem;
  color: #4a5568;
  font-weight: 500;
}

.pin-prikaz {
  display: flex;
  gap: 18px;
}

.pin-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid #cbd5e0;
  background: transparent;
  transition: all 0.15s ease;
}

.pin-dot.vnesen {
  background: #2c5282;
  border-color: #2c5282;
  transform: scale(1.1);
}

.pin-dot.napaka-anim {
  border-color: #e53e3e;
  background: #e53e3e;
}

.napaka {
  font-size: 0.88rem;
  color: #e53e3e;
  font-weight: 500;
  min-height: 1.2em;
  text-align: center;
}

.tipkovnica {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  width: 100%;
}

.tipka {
  aspect-ratio: 1;
  border: 2px solid #e2e8f0;
  border-radius: 14px;
  background: white;
  font-size: 1.5rem;
  font-weight: 600;
  color: #2d3748;
  cursor: pointer;
  transition: all 0.12s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.tipka:hover {
  background: #ebf4ff;
  border-color: #4299e1;
  transform: scale(1.05);
}

.tipka:active {
  transform: scale(0.96);
  background: #bee3f8;
}

.tipka-brisi {
  background: #fff5f5;
  border-color: #fed7d7;
  color: #e53e3e;
  font-size: 1.3rem;
}

.tipka-brisi:hover {
  background: #fed7d7;
  border-color: #e53e3e;
}

.tipka-prazna {
  background: transparent;
  border: none;
  cursor: default;
  pointer-events: none;
}
.tipka-prazna:hover { transform: none; background: transparent; }

.nazaj {
  font-size: 0.88rem;
  color: #4299e1;
  text-decoration: none;
}
.nazaj:hover { text-decoration: underline; }

@keyframes tresenje {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-8px); }
  40%       { transform: translateX(8px); }
  60%       { transform: translateX(-6px); }
  80%       { transform: translateX(6px); }
}

.tresenje { animation: tresenje 0.4s ease; }