:root {
  
  --primary: #1b4d3e; 
  --bg-color: #1b4d3e; 
  --card-bg: #f1f8e9; 
  --accent: #c5a059; 
  --error-color: #d32f2f; 
}

* {
  box-sizing: border-box;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color) !important;
  color: var(--primary);
  padding-top: 120px; 
  height: 100vh;
}

.container {
  max-width: 500px; 
  margin: 0 auto;
  padding: 0 20px;
}

.card {
  background-color: var(--card-bg);
  border-radius: 40px 10px 40px 10px; 
  padding: 40px 20px;
  box-shadow: -10px 10px 0px var(--accent); 
  text-align: center;
  border: none;
}

.timer-display {
  font-family: "Courier New", Courier, monospace; 
  font-size: 4.5rem;
  font-weight: 800;
  color: var(--primary); 
  margin: 30px 0;
  letter-spacing: -2px;
  font-variant-numeric: tabular-nums;
}

.timer-ms {
  font-size: 2rem;
  color: #9ca3af; 
}

.controls {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 30px;
}

.btn-circle {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  border: none;
  color: var(--accent);
  background-color: var(--primary);
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 15px rgba(27, 77, 62, 0.3);
  transition: all 0.2s ease;
}

.btn-circle:active {
  transform: translateY(3px);
  box-shadow: 0 2px 5px rgba(27, 77, 62, 0.2);
}

.btn-start {
  background-color: var(--primary);
  color: var(--accent); 
}

.btn-stop {
  background-color: var(--accent); 
  color: var(--primary); 
  display: none;
  box-shadow: 0 6px 15px rgba(197, 160, 89, 0.3);
}

.btn-reset {
  background-color: var(--error-color);
  color: white;
  box-shadow: 0 6px 15px rgba(211, 47, 47, 0.3);
}

.btn-lap {
  background-color: #ffffff;
  color: var(--primary);
  border: 2px solid var(--primary);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.laps-container {
  max-height: 250px;
  overflow-y: auto;
  border-top: 2px dashed rgba(27, 77, 62, 0.2); 
  padding-top: 15px;
}

.laps-container::-webkit-scrollbar {
  width: 6px;
}
.laps-container::-webkit-scrollbar-thumb {
  background: var(--accent); 
  border-radius: 10px;
}

.lap-item {
  display: flex;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid rgba(27, 77, 62, 0.1);
  font-family: "Courier New", monospace;
  font-weight: 700;
  color: var(--primary);
  animation: fadeIn 0.3s ease;
}

.lap-item:first-child {
  color: var(--accent); 
  font-weight: 800;
  font-size: 1.1rem;
}

.lap-number {
  color: #9ca3af;
}

.back-refresh-btn {
  position: fixed;
  top: 80px;
  left: 15px;
  z-index: 1000;
  background: var(--error-color);
  color: white;
  border: none;
  padding: 10px 15px;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

@media (max-width: 600px) {
  .timer-display {
    font-size: 3.5rem;
  }
  .timer-ms {
    font-size: 1.5rem;
  }
  .controls {
    gap: 15px;
  }
  .btn-circle {
    width: 60px;
    height: 60px;
    font-size: 1.2rem;
  }
  .card {
    padding: 30px 15px;
  }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}