:root {
  --bg-color: #0d1117;
  --text-color: #c9d1d9;
  --muted-color: #8b949e;
  --border-color: #30363d;
  --card-bg: #161b22;
  --accent-color: #58a6ff;
  --accent-hover: #1f6feb;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --sidebar-width: 320px;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.5;
  min-height: 100vh;
}

.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: 2.5rem;
  max-width: 1400px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

/* Sidebar Styling */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.profile-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.avatar {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  border: 4px solid var(--border-color);
  margin: 0 auto 1.5rem;
  display: block;
}

.profile-card h1 {
  font-size: 1.6rem;
  color: #fff;
  margin-bottom: 0.5rem;
}

.bio {
  font-size: 0.95rem;
  color: var(--muted-color);
  margin-bottom: 2rem;
}

.profile-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2rem;
  width: 100%;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-weight: 600;
  color: #fff;
  font-size: 1.2rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--muted-color);
  text-transform: lowercase;
}

.account-meta {
  width: 100%;
  text-align: left;
  font-size: 0.9rem;
  color: var(--muted-color);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.github-link {
  display: block;
  width: 100%;
  padding: 0.75rem 1.25rem;
  background-color: var(--accent-color);
  border: 1px solid var(--accent-hover);
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
  transition: background-color 0.2s;
  text-align: center;
}

.github-link:hover {
  background-color: var(--accent-hover);
}

.sidebar-section h3 {
  font-size: 1.1rem;
  margin-bottom: 1.2rem;
  color: #fff;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.6rem;
}

/* Analysis Charts - Horizontal Bars */
.analysis-chart {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.chart-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.chart-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--muted-color);
}

.chart-bar-bg {
  width: 100%;
  height: 8px;
  background-color: #161b22;
  border-radius: 4px;
  overflow: hidden;
}

.chart-bar-fill {
  height: 100%;
  background-color: var(--accent-color);
  border-radius: 4px;
  transition: width 0.5s ease-out;
}

/* Main Content Styling */
.main-content {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.content-section {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.section-header h2 {
  font-size: 1.6rem;
  color: #fff;
}

.badge {
  background-color: var(--border-color);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--muted-color);
}

/* Insights Grid - 2x4 Layout */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}

.insight-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.insight-label {
  font-size: 0.75rem;
  color: var(--muted-color);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.insight-value {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-color);
}

/* Calendar Styling */
.calendar-wrapper {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  overflow-x: auto;
}

.calendar-grid {
  display: flex;
  gap: 4px;
}

.calendar-week {
  display: grid;
  grid-template-rows: repeat(7, 12px);
  gap: 4px;
}

.calendar-day {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background-color: #21262d; /* Improved visibility for empty days */
}

.calendar-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--muted-color);
}

.calendar-legend {
  display: flex;
  gap: 4px;
}

.calendar-legend div {
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

/* Repos Grid */
.repos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.repo-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.8rem;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
}

.repo-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-color);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.repo-card h3 a {
  color: var(--accent-color);
  text-decoration: none;
  font-size: 1.2rem;
  font-weight: 600;
}

.repo-desc {
  font-size: 0.9rem;
  color: var(--muted-color);
  margin: 1rem 0 1.5rem;
  min-height: 3rem;
  flex-grow: 1;
}

.repo-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  font-size: 0.85rem;
  color: var(--muted-color);
  margin-bottom: 1.2rem;
}

.repo-meta span {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.repo-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.topic {
  background-color: rgba(88, 166, 255, 0.1);
  color: var(--accent-color);
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
  font-size: 0.75rem;
}

/* Activity Timeline Horizontal */
.activity-timeline-horizontal {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.activity-item {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 1.2rem;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.activity-msg {
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.activity-meta {
  font-size: 0.8rem;
  color: var(--muted-color);
  margin-top: auto;
}

footer {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 0 2rem;
  color: var(--muted-color);
  font-size: 0.85rem;
  border-top: 1px solid var(--border-color);
  margin-top: 2rem;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--accent-color);
}

@media (max-width: 1100px) {
  .insights-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .app-layout {
    grid-template-columns: 1fr;
    padding: 1.5rem;
  }
  .sidebar {
    position: static;
  }
  .insights-grid {
    grid-template-columns: 1fr;
  }
}