:root {
  --bg: #0d1117;
  --panel: #161b22;
  --border: #30363d;
  --text: #c9d1d9;
  --muted: #8b949e;
  --link: #58a6ff;
  --green: #3fb950;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, sans-serif;
}

.topbar {
  padding: 0.7rem 1.2rem;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.logo {
  font-weight: 600;
}

/* GRID */
.container {
  max-width: 1280px;
  margin: auto;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 260px 1fr 300px;
  gap: 2rem;
}

/* SIDEBAR */
.sidebar {
  text-align: center;
}

.avatar {
  width: 160px;
  border-radius: 50%;
  border: 2px solid var(--border);
}

.sidebar h2 {
  margin: 1rem 0 0;
}

.sidebar p {
  color: var(--muted);
  font-size: 0.95rem;
}

.stats {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin: 0.5rem 0;
}

.btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
}

/* MAIN */
.tabs {
  display: flex;
  gap: 1rem;
  border-bottom: 1px solid var(--border);
}

.tab {
  background: none;
  border: none;
  color: var(--muted);
  padding: 0.6rem;
  cursor: pointer;
}

.tab.active {
  color: var(--text);
  border-bottom: 2px solid var(--link);
}

.panel {
  display: none;
  margin-top: 1rem;
}

.panel.active {
  display: block;
}

input {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem;
  border-radius: 6px;
  margin-bottom: 1rem;
}

/* REPOS */
.repo {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 0.8rem;
}

.repo a {
  color: var(--link);
  text-decoration: none;
  font-size: 1.1rem;
}

.repo .desc {
  color: var(--muted);
  margin: 0.4rem 0;
}

/* ACTIVITY */
.activity h3 {
  margin-top: 0;
}

.activity-item {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}

#contribGraph {
  width: 100%;
  margin-top: 1rem;
  border-radius: 6px;
  background: var(--panel);
}