/* ============================================================
   layout.css — Sidebar + main shell for 4suite
   ============================================================ */

.app-shell {
  display: flex;
  min-height: 100vh;
  align-items: stretch;
}

.app-sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  max-height: 100vh;
  overflow-y: auto;
  transition: width 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 50;
}

.app-sidebar.collapsed {
  width: 60px;
}

.app-sidebar::-webkit-scrollbar { width: 6px; }
.app-sidebar::-webkit-scrollbar-thumb { background: var(--border-bright); border-radius: 3px; }

.sb-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 18px 18px 22px;
  border-bottom: 1px solid var(--border);
  min-height: 64px;
}

.sb-brand {
  display: flex;
  align-items: baseline;
  gap: 1px;
  text-decoration: none;
  color: var(--text);
  font-family: var(--serif);
  font-size: 26px;
  line-height: 1;
  font-weight: 400;
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
}

.sb-brand-mark {
  color: var(--gold);
  font-weight: 500;
}

.sb-brand-text em {
  font-style: italic;
  color: var(--gold);
}

.app-sidebar.collapsed .sb-brand-text {
  display: none;
}

.sb-collapse-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 26px;
  height: 26px;
  border-radius: 3px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  line-height: 1;
  transition: all 0.15s;
  flex-shrink: 0;
}

.sb-collapse-btn:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.app-sidebar.collapsed .sb-collapse-icon {
  transform: rotate(180deg);
  display: inline-block;
}

.sb-nav {
  padding: 12px 0;
  flex: 1;
}

.sb-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 16px 9px 22px;
  color: var(--text-dim);
  text-decoration: none;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  border-left: 2px solid transparent;
  transition: all 0.15s;
  white-space: nowrap;
}

.sb-link:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.025);
}

.sb-link.active {
  color: var(--gold);
  background: rgba(245, 200, 66, 0.06);
  border-left-color: var(--gold);
}

.sb-link.disabled {
  opacity: 0.42;
  cursor: not-allowed;
  pointer-events: none;
}

.sb-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 16px;
  color: var(--gold);
  flex-shrink: 0;
}

.sb-link.disabled .sb-icon { color: var(--text-faint); }
.sb-link.active .sb-icon { color: var(--gold); }

.sb-section {
  margin-top: 14px;
}

.sb-section:first-child { margin-top: 0; }

.sb-section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px 6px 22px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  color: var(--text-faint);
  text-transform: uppercase;
}

.sb-section-title .sb-icon {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
  font-style: normal;
}

.sb-soon-dot {
  margin-left: auto;
  color: var(--text-faint);
  font-size: 14px;
  line-height: 0;
}

.app-sidebar.collapsed .sb-label,
.app-sidebar.collapsed .sb-soon-dot {
  display: none;
}

.app-sidebar.collapsed .sb-section-title {
  padding-left: 0;
  padding-right: 0;
  justify-content: center;
}

.app-sidebar.collapsed .sb-link {
  padding-left: 0;
  padding-right: 0;
  justify-content: center;
}

.app-main {
  flex: 1;
  min-width: 0; /* prevent flex blowout */
}

/* Mobile: sidebar becomes a top bar (or off-canvas — kept simple here) */
@media (max-width: 760px) {
  .app-shell {
    flex-direction: column;
  }
  .app-sidebar {
    width: 100% !important;
    max-height: none;
    position: relative;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .app-sidebar.collapsed { width: 100% !important; }
  .app-sidebar.collapsed .sb-label,
  .app-sidebar.collapsed .sb-soon-dot { display: inline; }
  .app-sidebar.collapsed .sb-brand-text { display: inline; }
  .sb-collapse-btn { display: none; }
  .sb-nav {
    display: flex;
    flex-wrap: wrap;
    padding: 8px;
    gap: 4px;
  }
  .sb-section {
    width: 100%;
    margin-top: 4px;
    padding-top: 4px;
    border-top: 1px dashed var(--border);
  }
  .sb-section:first-child { border-top: none; }
  .sb-link {
    padding: 6px 12px;
    border-left: none;
    border-radius: 3px;
  }
  .sb-link.active { border-left: none; background: rgba(245, 200, 66, 0.1); }
}