.shell {
  min-height: 100vh;
  position: relative;
}

.content {
  max-width: 1500px;
  min-height: 100svh;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
}

.sidebar {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  width: 280px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.2rem;
  border: 1px solid #30363d;
  border-radius: 20px;
  background: rgba(22, 27, 34, 0.92);
  backdrop-filter: blur(10px);
  z-index: 20;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.brand {
  color: #e6edf3;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.subtitle {
  margin: 0;
  color: #8b949e;
  font-size: 0.92rem;
}

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

.nav a {
  padding: 0.7rem 0.8rem;
  border: 1px solid transparent;
  border-radius: 12px;
  color: #c9d1d9;
  text-decoration: none;
  transition: border-color 120ms ease, background-color 120ms ease, color 120ms ease;
}

.nav a:hover,
.nav a:focus-visible,
.nav a.active {
  border-color: #2f81f7;
  background: rgba(47, 129, 247, 0.14);
  color: #ffffff;
  outline: none;
}

.burger {
  display: none;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid #30363d;
  border-radius: 10px;
  background: rgba(13, 17, 23, 0.65);
  cursor: pointer;
  padding: 0.25rem;
}

.burger span {
  display: block;
  width: 1.2rem;
  height: 2px;
  margin: 0.24rem auto;
  background: #e6edf3;
}

.site-footer {
  margin-top: auto;
  padding-top: 2rem;
  text-align: center;
  color: #8b949e;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 1320px) {
  .content {
    max-width: 1040px;
  }

  .sidebar {
    position: static;
    width: auto;
    margin: 0 1.25rem 1.5rem;
  }

  .nav {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

@media (max-width: 768px) {
  .content {
    padding-top: calc(6.5rem + env(safe-area-inset-top));
  }

  .sidebar {
    position: fixed;
    top: 0.75rem;
    right: 0.75rem;
    left: 0.75rem;
    width: auto;
    margin: 0;
    gap: 0.6rem;
    border-radius: 16px;
  }

  .subtitle {
    display: none;
  }

  .burger {
    display: inline-block;
  }

  .nav {
    display: none;
    flex-direction: column;
    gap: 0.4rem;
  }

  .nav.nav-open {
    display: flex;
  }
}