.shell {
  position: relative;
  display: grid;
  grid-template-columns: 340px 1fr;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  padding: var(--space-5) var(--space-4);
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  background: linear-gradient(
    180deg,
    rgba(0, 0, 0, 0.18),
    rgba(0, 0, 0, 0.03)
  );
  backdrop-filter: blur(10px);
  overflow: auto;
}

.main {
  padding: var(--space-6) clamp(18px, 4vw, 56px);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: var(--space-4);
}

.logo {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: radial-gradient(
      18px 18px at 30% 30%,
      rgba(255, 255, 255, 0.18),
      transparent 55%
    ),
    linear-gradient(135deg, rgba(56, 189, 248, 0.35), rgba(251, 113, 133, 0.3));
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.25);
  display: grid;
  place-items: center;
}

.logo-dot {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 99px;
  background: linear-gradient(135deg, var(--brand-a), var(--brand-b));
  filter: drop-shadow(0 10px 12px rgba(0, 0, 0, 0.35));
}

.brand-title {
  font-family: var(--font-serif);
  letter-spacing: 0.2px;
  font-size: 18px;
}

.brand-sub {
  font-size: 13px;
  color: var(--muted);
}

.panel {
  border-radius: var(--r-lg);
  padding: var(--space-4);
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.18);
  margin-top: var(--space-3);
}

.panel-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-serif);
  font-size: 16px;
  letter-spacing: 0.2px;
}

.panel-text {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.panel-note p {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.hero {
  max-width: 940px;
  margin-bottom: var(--space-5);
  animation: heroIn 520ms ease-out both;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.06;
  letter-spacing: 0.2px;
  margin: 0 0 var(--space-2);
}

.hero-sub {
  margin: 0 0 var(--space-2);
  font-size: 16px;
  color: var(--muted);
  max-width: 70ch;
}

.hero-kicker {
  margin: 0;
  font-size: 13px;
  color: var(--faint);
  max-width: 85ch;
}

@keyframes heroIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.footer {
  margin-top: var(--space-6);
  color: var(--faint);
  font-size: 13px;
}

@media (max-width: 980px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: relative;
    height: auto;
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  }

  .main {
    padding-top: var(--space-4);
  }
}