body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background-color: #000814;
  color: #00F7FF;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.calculator-container {
  background: linear-gradient(rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.9));
  border: 2px solid #00F7FF;
  border-radius: 20px;
  padding: 40px;
  position: relative;
  width: 90%;
  max-width: 1200px;
  box-shadow: 0 0 20px #00F7FF40;
}

.calculator-container::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 20px;
  background: linear-gradient(45deg, #00F7FF, transparent, #00F7FF);
  z-index: -1;
}

h1 {
  text-align: center;
  margin: 0 0 40px 0;
  font-size: 2.5rem;
  color: #00F7FF;
  text-shadow: 0 0 10px #00F7FF80;
  letter-spacing: 2px;
}

.container {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  padding: 20px;
  margin: auto;
}

@media (max-width: 1200px) {
  .container {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 992px) {
  .container {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .container {
    grid-template-columns: 1fr;
  }
}

:root {
  --primary-color: #00F7FF;
  --usage-percent: 0%;
}

.card {
  background: rgba(0, 0, 0, 0.7);
  border: 1px solid #00F7FF;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 0 10px #00F7FF40;
  transition: all 0.3s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  backdrop-filter: blur(5px);
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(from 0deg at 50% 50%, transparent 0deg, #00F7FF 360deg);
  animation: rotate 4s linear infinite;
  opacity: 0.1;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 247, 255, 0.3);
}

.card:hover .emoji {
  transform: scale(1.2) rotate(15deg);
}

.emoji {
  font-size: 2.5em;
  margin: 10px 0;
  transition: transform 0.3s ease;
  filter: drop-shadow(0 0 10px rgba(0, 247, 255, 0.5));
}

.power-info {
  font-size: 0.9em;
  color: #00F7FF;
  opacity: 0.8;
  text-shadow: 0 0 5px rgba(0, 247, 255, 0.5);
}

.slider-container {
  position: relative;
  width: 100%;
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, #00F7FF var(--usage-percent), rgba(0, 247, 255, 0.2) var(--usage-percent));
  border-radius: 2px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: #00F7FF;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 10px #00F7FF;
  transition: all 0.3s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 15px #00F7FF;
}

.hours-display {
  position: absolute;
  top: -25px;
  right: 0;
  font-size: 0.9em;
  color: #00F7FF;
  text-shadow: 0 0 5px rgba(0, 247, 255, 0.5);
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

#result {
  margin-top: 30px;
  padding: 20px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.8);
  border: 1px solid #00F7FF;
  text-align: center;
  position: relative;
  overflow: hidden;
}

#result::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(0, 247, 255, 0.1) 0%, transparent 70%);
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.2); opacity: 0.8; }
  100% { transform: scale(1); opacity: 0.5; }
}

#calculateBtn {
  background: transparent;
  border: 2px solid #00F7FF;
  color: #00F7FF;
  padding: 12px 30px;
  border-radius: 25px;
  font-size: 1.1em;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  margin-top: 20px;
}

#calculateBtn::before {
  content: '';
  position: absolute;
  top: -100%;
  left: -100%;
  width: 300%;
  height: 300%;
  background: linear-gradient(45deg, transparent, rgba(0, 247, 255, 0.3), transparent);
  transform: rotate(45deg);
  transition: all 0.5s ease;
}

#calculateBtn:hover::before {
  top: -50%;
  left: -50%;
}

#calculateBtn:hover {
  box-shadow: 0 0 20px rgba(0, 247, 255, 0.5);
  text-shadow: 0 0 10px rgba(0, 247, 255, 0.5);
}

input[type="number"] {
  width: 100%;
  padding: 8px 12px;
  background: rgba(0, 247, 255, 0.1);
  border: 1px solid #00F7FF;
  border-radius: 5px;
  color: #00F7FF;
  font-size: 1rem;
  -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 0 20px #00F7FF80;
}

.emoji {
  font-size: 2rem;
  margin-bottom: 15px;
  text-shadow: 0 0 10px #00F7FF80;
}

.error-message {
  color: #ff4444;
  font-size: 0.8rem;
  margin-top: 5px;
  min-height: 1em;
}

.input-group {
  margin: 15px 0;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

input {
  width: 100%;
  padding: 8px 12px;
  background: rgba(0, 247, 255, 0.1);
  border: 1px solid #00F7FF;
  border-radius: 5px;
  color: #00F7FF;
  font-size: 1rem;
}

input:focus {
  outline: none;
  box-shadow: 0 0 10px #00F7FF80;
}

.calculate-btn {
  background: transparent;
  color: #00F7FF;
  padding: 12px 40px;
  border: 2px solid #00F7FF;
  font-size: 1.2rem;
  border-radius: 30px;
  cursor: pointer;
  margin: 30px auto;
  display: block;
  transition: all 0.3s ease;
  text-shadow: 0 0 5px #00F7FF;
  letter-spacing: 1px;
}

.calculate-btn:hover {
  background: #00F7FF;
  color: #000814;
  box-shadow: 0 0 20px #00F7FF80;
  transform: scale(1.05);
}

.results {
  text-align: center;
  font-size: 1.4rem;
  margin-top: 30px;
  padding: 20px;
  border-radius: 10px;
  background: rgba(0, 247, 255, 0.1);
  border: 1px solid #00F7FF;
}

.fade-in {
  animation: fadeIn 1s ease-in-out;
}

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

.card {
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px) scale(1.02);
  box-shadow: 0 0 30px var(--primary-color);
}

.power-info {
  font-size: 0.8rem;
  color: var(--primary-color);
  opacity: 0.8;
  margin-top: 5px;
}

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

input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 4px;
  background: rgba(0, 247, 255, 0.2);
  border-radius: 2px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  background: var(--primary-color);
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 0 10px var(--primary-color);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.hours-display {
  min-width: 40px;
  text-align: right;
  font-size: 0.9rem;
}

.usage-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: rgba(0, 247, 255, 0.1);
}

.usage-fill {
  height: 100%;
  width: 0;
  background: var(--primary-color);
  transition: width 0.3s ease;
  box-shadow: 0 0 10px var(--primary-color);
}

.results {
  position: relative;
  overflow: hidden;
}

.results::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: var(--usage-percent);
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 247, 255, 0.1));
  transition: width 0.5s ease;
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.05); opacity: 1; }
  100% { transform: scale(1); opacity: 0.5; }
}

.emoji {
  animation: pulse 2s infinite ease-in-out;
}

.calculate-btn {
  position: relative;
  overflow: hidden;
}

.calculate-btn::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(0, 247, 255, 0.1), transparent);
  transform: rotate(45deg);
  animation: shine 3s infinite;
}

@keyframes shine {
  0% { transform: translateX(-100%) rotate(45deg); }
  100% { transform: translateX(100%) rotate(45deg); }
}