.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--topbar-h) 1fr;
  grid-template-areas: 'sidebar topbar' 'sidebar main';
  min-height: 100vh;
}

.sidebar {
  grid-area: sidebar;
  background: var(--paper);
  border-right: 1px solid var(--border-soft);
  padding: 20px 16px;
}

.wordmark {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 4px 0 28px 4px;
}
.wordmark .lockup { display: flex; align-items: center; gap: 10px; }
.wordmark svg { width: 26px; height: 26px; flex-shrink: 0; }
.wordmark .name { font-family: var(--font-display); font-size: 22px; line-height: 26px; letter-spacing: -0.01em; }
.wordmark .name .spec {
  background-image: var(--gradient-spec);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.wordmark .sub {
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--grey);
  margin-left: 36px;
}

.sidebar nav a {
  display: block;
  padding: 8px 10px 8px 12px;
  margin: 2px 0;
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  font-size: 14px;
  line-height: 22px;
  border-left: 2px solid transparent;
}
.sidebar nav a:hover { background: var(--hover-bg); }
.sidebar nav a.active {
  background: var(--active-bg);
  border-left-color: var(--active-accent);   /* subtle CTA-orange accent bar */
  font-weight: 500;
}
.sidebar nav a.disabled { color: var(--grey); cursor: not-allowed; border-left-color: transparent; }
.sidebar nav a.disabled small {
  color: var(--grey);
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-left: 6px;
}

.topbar {
  grid-area: topbar;
  background: var(--paper);
  border-bottom: 1px solid var(--border-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}

.presence { display: flex; gap: 20px; font-size: 13px; color: var(--grey); }
.presence .who { display: inline-flex; align-items: center; gap: 6px; }
.presence .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--grey); }

.me { display: flex; align-items: center; gap: 10px; font-size: 13px; }
.me img { width: 28px; height: 28px; border-radius: 50%; }

.main { grid-area: main; padding: 24px; overflow: auto; }

.btn {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 8px 14px;
  font-size: 13px;
  line-height: 18px;
  cursor: pointer;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  transition: border-color 0.12s, background 0.12s;
}
.btn:hover { border-color: var(--ink); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.primary {
  background: var(--cta);
  color: var(--paper);
  border-color: var(--cta);
  font-weight: 500;
}
.btn.primary:hover { filter: brightness(0.92); border-color: var(--cta); }
a.btn { text-decoration: none; display: inline-block; }

@media (max-width: 720px) {
  .app { grid-template-columns: 1fr; grid-template-areas: 'topbar' 'main'; }
  .sidebar { display: none; }
  .sidebar.open { display: block; position: fixed; inset: 0 40% 0 0; z-index: 10; background: var(--paper); }
}