/* Global Theme Variables */
:root {
  --bg-color: #0d1117;
  --card-bg: #161b22;
  --card-border: #30363d;
  --accent-color: #0088cc;
  --accent-hover: #0099e6;
  --text-main: #e6edf3;
  --text-muted: #8b949e;
  --nav-bg: rgba(13, 17, 23, 0.9);
}

[data-theme="light"] {
  --bg-color: #f6f8fa;
  --card-bg: #ffffff;
  --card-border: #d0d7de;
  --accent-color: #0969da;
  --accent-hover: #0860ca;
  --text-main: #1f2328;
  --text-muted: #656d76;
  --nav-bg: rgba(255, 255, 255, 0.95);
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif; transition: background-color 0.2s, color 0.2s; }
body { background-color: var(--bg-color); color: var(--text-main); min-height: 100vh; display: flex; flex-direction: column; overflow-x: hidden; }

/* Navbar */
header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(14px); background: var(--nav-bg);
  border-bottom: 1px solid var(--card-border);
}
.navbar {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  font-size: 20px; font-weight: 800; color: var(--text-main); text-decoration: none;
}
.brand img {
  width: 36px; height: 36px; border-radius: 10px; object-fit: cover;
}
.nav-links {
  display: flex; list-style: none; gap: 20px; align-items: center;
}
.nav-links a {
  color: var(--text-muted); text-decoration: none; font-size: 14px; font-weight: 500;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text-main);
}
.btn-login-nav {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: 8px; padding: 7px 14px; color: var(--text-main); font-weight: 600; text-decoration: none;
}
.theme-toggle-btn {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: 8px; padding: 8px; color: var(--text-muted);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
}
.theme-toggle-btn:hover { color: var(--text-main); }

/* Footer */
footer {
  border-top: 1px solid var(--card-border); background: var(--card-bg);
  padding: 24px 0; margin-top: auto;
}
.footer-content {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px;
}
.footer-disclaimer { font-size: 13px; color: var(--text-muted); }
.footer-disclaimer a { color: var(--text-muted); text-decoration: underline; }
.footer-nav { display: flex; list-style: none; gap: 20px; flex-wrap: wrap; }
.footer-nav a { font-size: 13px; color: var(--text-muted); text-decoration: none; }
.footer-nav a:hover { color: var(--text-main); }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .footer-content { flex-direction: column; text-align: center; }
  .footer-nav { justify-content: center; }
}