:root {
  --cell-size: 12px;
  --gap: 3px;
  --color-scale-0: #ebedf0;
  --color-scale-1: #9be9a8;
  --color-scale-2: #40c463;
  --color-scale-3: #30a14e;
  --color-scale-4: #216e39;
  --primary-color: #0366d6;
  --secondary-color: #586069;
  --border-color: #e1e4e8;
  --bg-color: #f6f8fa;
  --card-bg: #ffffff;
  --hover-bg: #f0f3f6;
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-color);
  color: #24292e;
  padding: 2rem;
  line-height: 1.5;
}

.container {
  max-width: 950px;
  margin: 0 auto;
}

header {
  margin-bottom: 2rem;
  text-align: center;
}

h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: #24292e;
}

.subtitle {
  color: var(--secondary-color);
  font-size: 1.1rem;
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2rem 0 1rem;
  color: #24292e;
}

.calendar-wrapper {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.05);
  margin-bottom: 2rem;
  position: relative;
}

.calendar-header {
  display: flex;
  margin-bottom: 0.5rem;
}

.month-labels {
  display: flex;
  padding-left: 28px;
  width: 100%;
}

.month-label {
  flex: 1;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--secondary-color);
}

.day-labels {
  display: flex;
  flex-direction: column;
  gap: calc(var(--cell-size) + var(--gap));
  position: absolute;
  top: 70px;
  font-size: 0.75rem;
  color: var(--secondary-color);
}

.day-labels span {
  height: var(--cell-size);
  line-height: var(--cell-size);
  text-align: right;
  width: 24px;
  padding-right: 4px;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(26, var(--cell-size));
  grid-template-rows: repeat(7, var(--cell-size));
  gap: var(--gap);
  margin-left: 28px;
}

.day-cell {
  background: var(--color-scale-0);
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.day-cell:hover {
  transform: scale(1.2);
  z-index: 2;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
}

.day-cell.active {
  border: 2px solid #24292e;
}

.legend {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--secondary-color);
}

.legend-scale {
  display: flex;
  gap: 1px;
}

.legend-item {
  display: inline-block;
  width: 16px;
  height: 16px;
  border-radius: 2px;
}

.contributions-container {
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: var(--card-bg);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.05);
  overflow: hidden;
}

.contribution-item {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: background-color 0.15s ease;
}

.contribution-item:hover {
  background-color: var(--hover-bg);
}

.contribution-item:last-child {
  border-bottom: none;
}

.contribution-date {
  font-weight: 600;
  color: #24292e;
  padding: 0.5rem 0;
  background-color: rgba(245, 248, 250, 0.8);
  font-size: 1rem;
}

.contribution-type {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: capitalize;
  color: var(--primary-color);
  background: rgba(3, 102, 214, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  text-align: center;
  min-width: 85px;
}

.contribution-type.like {
  color: #e36209;
  background: rgba(227, 98, 9, 0.1);
}

.contribution-type.project {
  color: #6f42c1;
  background: rgba(111, 66, 193, 0.1);
}

.contribution-title {
  font-size: 0.95rem;
  font-weight: 500;
  flex-grow: 1;
}

.tooltip {
  position: absolute;
  background: #24292e;
  color: white;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  pointer-events: none;
  white-space: nowrap;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.16);
  z-index: 100;
}

.tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: #24292e transparent transparent transparent;
}

.stats-bar {
  display: flex;
  justify-content: space-around;
  margin-bottom: 2rem;
  gap: 1rem;
}

.stat {
  background: var(--card-bg);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  flex: 1;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
}

.stat span:first-child {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--secondary-color);
}