.post-side-panel {
  display: none;
}

.post-side-panel.open {
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  right: 0;
  width: 480px;
  height: 100vh;
  background: var(--bg);
  border-left: 1px solid var(--border);
  z-index: 900;
  box-shadow: -4px 0 16px rgba(0, 0, 0, 0.08);
  animation: side-slide-in 0.2s ease-out;
}

@keyframes side-slide-in {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

.post-side-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 1;
}

.post-side-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-h);
}

.post-side-close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: none;
  color: var(--text-h);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.post-side-close:hover {
  background: var(--hover-bg);
}

.post-side-body {
  overflow-y: auto;
  flex: 1;
}

@media (max-width: 1100px) {
  .post-side-panel.open {
    width: 400px;
  }
}

@media (max-width: 768px) {
  .post-side-panel.open {
    width: 100%;
  }
}

[data-theme="dark"] .post-side-panel.open {
  box-shadow: -4px 0 16px rgba(0, 0, 0, 0.3);
}