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

body {
  font-family: "Arial", sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Main Stopwatch Container */
.stopwatch {
  background: rgba(255, 255, 255, 0.95);
  padding: 3vh 5vw;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  text-align: center;
  backdrop-filter: blur(10px);
  border-radius: 44px;
  border-style: ridge;
  border-width: 15px;
  border-left-color: rgb(255, 164, 85);
  border-right-color: rgb(255, 164, 85);
  border-bottom: none;
  border-top: none;
}

/* Heading Styles */
.heading h1 {
  color: #2c3e50;
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1.5vh;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
  letter-spacing: 1px;
}

/* Timer Container */
.timer-container {
  margin: 3vh 0;
}

.timer-display {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-bottom: 4vh;
}

/* Individual Digit Cards */
.digit-card {
  background: linear-gradient(145deg, #34495e, #2c3e50);
  color: #00ff88;
  padding: 2vh 1vw;
  border-radius: 12px;
  box-shadow: inset 5px 5px 10px rgba(0, 0, 0, 0.3),
    inset -5px -5px 10px rgba(255, 255, 255, 0.1), 0 5px 15px rgba(0, 0, 0, 0.2);
  min-width: 3.5vw;
  position: relative;
  overflow: hidden;
}

.digit-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    45deg,
    transparent 30%,
    rgba(255, 255, 255, 0.1) 50%,
    transparent 70%
  );
  pointer-events: none;
}

.digit-card span {
  font-size: 3rem;
  font-weight: bold;
  font-family: "Courier New", monospace;
  text-shadow: 0 0 10px rgba(0, 255, 136, 0.5);
  display: block;
  transition: all 0.3s ease;
}

/* Separator Styling */
.separator {
  color: #2c3e50;
  font-size: 3rem;
  font-weight: bold;
  margin: 0 10px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
  animation: blink 1s infinite;
}

@keyframes blink {
  0%,
  50% {
    opacity: 1;
  }
  51%,
  100% {
    opacity: 0.3;
  }
}

/* Button Container */
.button-display {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* Button Styles */
button {
  padding: 15px 30px;
  font-size: 1.1rem;
  font-weight: 600;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 1px;
  min-width: 120px;
  position: relative;
  overflow: hidden;
}

button::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.5s;
}

button:hover::before {
  left: 100%;
}

/* Start Button */
#start-btn {
  background: linear-gradient(45deg, #27ae60, #2ecc71);
  color: white;
  box-shadow: 0 5px 15px rgba(46, 204, 113, 0.4);
}

#start-btn:hover {
  background: linear-gradient(45deg, #229954, #27ae60);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(46, 204, 113, 0.6);
}

/* Pause Button */
#pause-btn {
  background: linear-gradient(45deg, #f39c12, #e67e22);
  color: white;
  box-shadow: 0 5px 15px rgba(243, 156, 18, 0.4);
}

#pause-btn:hover {
  background: linear-gradient(45deg, #e67e22, #d35400);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(243, 156, 18, 0.6);
}

/* Reset Button */
#reset-btn {
  background: linear-gradient(45deg, #e74c3c, #c0392b);
  color: white;
  box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4);
}

#reset-btn:hover {
  background: linear-gradient(45deg, #c0392b, #a93226);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(231, 76, 60, 0.6);
}

/* Button Active States */
button:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

/* Responsive Design */
@media (max-width: 768px) {
  .stopwatch {
    padding: 30px 20px;
    margin: 20px;
  }

  .heading h1 {
    font-size: 2rem;
  }

  .digit-card {
    padding: 15px 10px;
    min-width: 60px;
  }

  .digit-card span {
    font-size: 2.5rem;
  }

  .separator {
    font-size: 2.5rem;
    margin: 0 5px;
  }

  button {
    padding: 12px 20px;
    font-size: 1rem;
    min-width: 100px;
  }

  .button-display {
    gap: 15px;
  }
}

@media (max-width: 480px) {
  .timer-display {
    gap: 5px;
  }

  .digit-card {
    padding: 12px 8px;
    min-width: 50px;
  }

  .digit-card span {
    font-size: 2rem;
  }

  .separator {
    font-size: 2rem;
    margin: 0 3px;
  }

  .button-display {
    flex-direction: column;
    align-items: center;
  }
}

/* Hover Effects for Digit Cards */
.digit-card:hover {
  transform: scale(1.05);
  box-shadow: inset 5px 5px 10px rgba(0, 0, 0, 0.3),
    inset -5px -5px 10px rgba(255, 255, 255, 0.1), 0 8px 25px rgba(0, 0, 0, 0.3);
}

/* Animation for number changes */
.digit-card span.changing {
  animation: digitFlip 0.3s ease-in-out;
}

@keyframes digitFlip {
  0% {
    transform: rotateX(0deg);
  }
  50% {
    transform: rotateX(90deg);
  }
  100% {
    transform: rotateX(0deg);
  }
}