:root { 
  --font-main: ui-sans-serif, system-ui, -apple-system, sans-serif;
  --bg-main: #0b0f14;
  --bg-card: #0f1623;
  --border-color: #202938;
  --text-main: #e6edf3;
  --text-muted: #8b949e;
  --color-accent: #7ee787;
  --color-success: #238636;
  --color-danger: #da3633;
  --bg-code: #161b22;
}

body { 
  margin: 0; 
  background: var(--bg-main); 
  color: var(--text-main); 
  font-family: var(--font-main);
  line-height: 1.5;
}

a { color: var(--color-accent); text-decoration: none; transition: opacity 0.2s; }
a:hover { text-decoration: underline; opacity: 0.8; }

.topbar {
  display: flex; 
  justify-content: space-between; 
  align-items: center;
  padding: 12px 24px; 
  border-bottom: 1px solid var(--border-color); 
  background: var(--bg-main);
  position: sticky; 
  top: 0;
  z-index: 100;
}

.brand a { font-weight: 800; font-size: 1.2rem; color: var(--text-main); letter-spacing: -0.5px; }
.nav a { margin-left: 16px; color: var(--text-muted); font-size: 14px; font-weight: 500; }
.nav a:hover { color: var(--text-main); }

.auth-status { display: flex; align-items: center; gap: 12px; }
.container { padding: 32px 20px; max-width: 1100px; margin: 0 auto; }

h1 { margin: 0 0 16px 0; font-size: 32px; font-weight: 700; }
h2 { margin: 0 0 12px 0; font-size: 18px; color: var(--text-main); font-weight: 600; }
.muted { color: var(--text-muted); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  margin: 16px 0;
}

.hero { padding: 40px 0; text-align: center; border-bottom: 1px solid var(--border-color); margin-bottom: 30px; }
.hero h1 { font-size: 48px; letter-spacing: -1px; }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 900px) { .grid { grid-template-columns: 1fr; } }

.btn {
  padding: 8px 16px; border-radius: 8px; border: none;
  background: var(--color-success); color: white;
  font-size: 14px; font-weight: 600; cursor: pointer;
  display: inline-flex; align-items: center; gap: 8px;
}
.btn:hover { background: #2ea043; }
.btn-outline { background: transparent; border: 1px solid var(--border-color); color: var(--text-main); }
.btn-outline:hover { background: rgba(255,255,255,0.05); }
.btn-sm { padding: 4px 10px; font-size: 12px; }

table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 8px; border-bottom: 1px solid var(--border-color); font-size: 14px; vertical-align: top; }
th { text-align: left; color: var(--text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; }

.markdown-body { font-size: 15px; line-height: 1.6; }
.markdown-body pre {
  margin-bottom: 16px; padding: 16px; overflow: auto;
  background-color: var(--bg-code); border-radius: 6px; border: 1px solid var(--border-color);
}

.chat-bubble { padding: 16px; border-radius: 12px; margin-top: 8px; }
.chat-bubble.user { background: rgba(255,255,255,0.03); border: 1px solid var(--border-color); }
.chat-bubble.assistant { background: rgba(210, 168, 255, 0.05); border-left: 4px solid #d2a8ff; }

.timeline-item { display: flex; gap: 20px; position: relative; }
.timeline-visual { display: flex; flex-direction: column; align-items: center; width: 24px; }
.timeline-dot { width: 12px; height: 12px; background: var(--color-accent); border-radius: 50%; margin-top: 6px; z-index: 2; }
.timeline-line { width: 2px; flex-grow: 1; background: var(--border-color); }
.timeline-content { flex-grow: 1; padding-bottom: 24px; }

.commit-card {
  background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px;
  padding: 12px 16px; display: flex; justify-content: space-between; align-items: center;
}
.commit-card:hover { border-color: var(--color-accent); transform: translateX(4px); }

.toast {
  position: fixed; bottom: 24px; right: 24px; padding: 12px 20px;
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: 12px; z-index: 10000;
}

.modal-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.8); display: flex; align-items: center; justify-content: center; z-index: 1000;
}