:root {
  --bg-dark-blue: #0d1117;
  --card-bg: #1a1e2c;
  --card-header: #262b3c;
  --text-white: #e6e7e9;
  --text-gray: #a3a6b5;
  --blue-accent: #3b82f6;
}

body {
  background-color: var(--bg-dark-blue);
  color: var(--text-white);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.nav-tab {
  background-color: var(--card-bg);
  color: #a3a6b5;
  padding: 10px 24px;
  border-radius: 6px;
  font-weight: 500;
  transition: all 0.2s;
  text-decoration: none;
}

.nav-tab.active {
  background-color: #32384d;
  color: white;
}

.card {
  background-color: var(--card-bg);
  border-radius: 12px;
  overflow: hidden;
}

.card-header {
  background-color: var(--card-header);
  padding: 16px 24px;
  border-top-left-radius: 12px;
  border-top-right-radius: 12px;
}

.progress-bar {
  background-color: #272c3d;
  border-radius: 9999px;
  height: 8px;
  overflow: hidden;
}

.progress-fill {
  background-color: var(--blue-accent);
  height: 100%;
  border-radius: 9999px;
}

.stats-card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 20px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid #272c3d;
}

th {
  color: var(--text-gray);
  font-weight: normal;
  font-size: 0.9rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--blue-accent);
  color: white;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 6px;
  transition: all 0.2s;
  cursor: pointer;
  text-decoration: none;
  border: none;
}

.btn:hover {
  background-color: #2563eb;
}

.btn-outline {
  background-color: transparent;
  border: 1px solid #4b5563;
  color: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 6px;
  transition: all 0.2s;
  cursor: pointer;
  text-decoration: none;
}

.btn-outline:hover {
  background-color: #272c3d;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--card-bg);
  color: white;
  width: 36px;
  height: 36px;
  border-radius: 6px;
  border: 1px solid #4b5563;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-icon:hover {
  background-color: #272c3d;
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 9999px;
  background: #272c3d;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--blue-accent);
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--blue-accent);
  cursor: pointer;
  border: none;
}