.thoughts-journal-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  align-items: start;
  gap: clamp(34px, 4vw, 58px);
  margin-top: 46px;
}

.thoughts-journal-main,
.archive-content {
  min-width: 0;
}

.thoughts-journal-main .thoughts-volume-nav {
  margin-top: 0;
}

.thoughts-folder-sidebar {
  position: sticky;
  top: 104px;
  min-width: 0;
}

.thoughts-folder-panel {
  padding: 0 22px 18px 0;
  border-right: 1px solid rgba(166, 134, 85, 0.25);
}

.thoughts-folder-panel > summary,
.thoughts-folder-tree details > summary {
  list-style: none;
  cursor: pointer;
}

.thoughts-folder-panel > summary::-webkit-details-marker,
.thoughts-folder-tree details > summary::-webkit-details-marker {
  display: none;
}

.thoughts-folder-panel > summary {
  display: grid;
  grid-template-columns: 20px 1fr;
  align-items: center;
  gap: 8px;
  padding: 4px 0 17px;
  color: #7c6646;
  border-bottom: 1px solid rgba(166, 134, 85, 0.2);
  font-size: 17px;
  letter-spacing: 0.1em;
}

.thoughts-folder-panel > summary small {
  grid-column: 2;
  margin-top: -7px;
  color: #aa916b;
  font-family: var(--font-en-serif);
  font-size: 12px;
  font-style: italic;
  letter-spacing: 0.02em;
}

.thoughts-folder-tree {
  display: grid;
  gap: 4px;
  padding-top: 13px;
}

.thoughts-tree-root,
.thoughts-folder-tree details > summary,
.thoughts-folder-tree details a {
  color: #746752;
  text-decoration: none;
}

.thoughts-tree-root {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 36px;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 14px;
}

.thoughts-tree-root:hover,
.thoughts-tree-root.is-active,
.thoughts-folder-tree details a:hover {
  color: #8e6b36;
  background: rgba(255, 253, 247, 0.74);
}

.thoughts-folder-tree details {
  margin-top: 3px;
}

.thoughts-folder-tree details > summary {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 38px;
  padding: 5px 8px;
  font-size: 15px;
  letter-spacing: 0.06em;
}

.thoughts-folder-tree details > summary::after {
  content: "›";
  margin-left: auto;
  color: #b69a6e;
  transform: rotate(0deg);
  transition: transform 0.2s ease;
}

.thoughts-folder-tree details[open] > summary::after {
  transform: rotate(90deg);
}

.thoughts-folder-tree details > div {
  display: grid;
  margin: 1px 0 7px 24px;
  padding-left: 13px;
  border-left: 1px solid rgba(166, 134, 85, 0.22);
}

.thoughts-folder-tree details a {
  position: relative;
  padding: 7px 7px 7px 15px;
  border-radius: 3px;
  font-size: 13px;
}

.thoughts-folder-tree details a::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 2px;
  width: 5px;
  height: 1px;
  background: #c4aa7d;
}

.thoughts-folder-icon {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 11px;
  flex: 0 0 auto;
  border: 1px solid #b49562;
  border-radius: 2px;
  background: #fffaf0;
}

.thoughts-folder-icon::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 1px;
  width: 7px;
  height: 4px;
  border: 1px solid #b49562;
  border-bottom: 0;
  border-radius: 2px 2px 0 0;
  background: #fffaf0;
}

.thoughts-note-icon {
  display: inline-block;
  width: 12px;
  height: 15px;
  flex: 0 0 auto;
  border: 1px solid #b9a27d;
  border-radius: 1px;
  background: linear-gradient(135deg, transparent 0 7px, #efe3ce 7px) top right / 6px 6px no-repeat, #fffdf8;
}

@media (min-width: 901px) {
  .thoughts-folder-panel > summary {
    pointer-events: none;
  }

  .thoughts-folder-panel:not([open]) > .thoughts-folder-tree {
    display: grid;
  }
}

@media (max-width: 900px) {
  .thoughts-journal-layout,
  .archive-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .thoughts-folder-sidebar {
    position: static;
  }

  .thoughts-folder-panel {
    padding: 0;
    border: 1px solid rgba(166, 134, 85, 0.25);
    border-radius: 5px;
    background: rgba(255, 253, 248, 0.58);
  }

  .thoughts-folder-panel > summary {
    position: relative;
    grid-template-columns: 20px 1fr auto;
    min-height: 56px;
    padding: 10px 16px;
    border-bottom: 0;
  }

  .thoughts-folder-panel > summary small {
    grid-column: 3;
    margin: 0 22px 0 0;
  }

  .thoughts-folder-panel > summary::after {
    content: "+";
    position: absolute;
    right: 16px;
    color: #aa8c5d;
  }

  .thoughts-folder-panel[open] > summary::after {
    content: "−";
  }

  .thoughts-folder-tree {
    padding: 8px 14px 16px;
    border-top: 1px solid rgba(166, 134, 85, 0.18);
  }
}

@media (prefers-reduced-motion: reduce) {
  .thoughts-folder-tree details > summary::after {
    transition: none;
  }
}