/* ─── Sidebar ─── */
#sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: transparent;
  display: flex;
  flex-direction: column;
  height: 100vh;
  border-right: 1px solid var(--border);
  overflow: hidden;
  transition: width 0.28s ease;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 12px 4px;
  flex-shrink: 0;
}

#sidebar-close-btn {
  width: 28px; height: 28px;
  border-radius: 7px; border: none;
  background: transparent; color: var(--text-3);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; flex-shrink: 0;
  transition: background 0.15s, color 0.15s;
}
#sidebar-close-btn:hover { background: rgba(0,0,0,0.06); color: var(--text-2); }

#sidebar-open-btn {
  position: fixed; top: 14px; left: 14px; z-index: 100;
  width: 32px; height: 32px; border-radius: 8px; border: none;
  background: rgba(255,255,255,0.88); color: var(--text-2);
  display: none; align-items: center; justify-content: center;
  cursor: pointer; transition: background 0.15s;
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 8px rgba(0,0,0,0.08), 0 0 0 1px var(--border);
}
#sidebar-open-btn:hover { background: rgba(255,255,255,0.98); color: var(--text); }
body.sidebar-collapsed #sidebar-open-btn { display: flex; }

.sidebar-top {
  padding: 0 12px 8px;
  flex-shrink: 0;
}

/* 整体滚动块（2026-08-07）：从「搜索聊天」按钮到两个对话分组一起滚，
   内部不再有任何独立滚动条 */
.sidebar-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.sidebar-scroll .sidebar-top { flex-shrink: 0; }

/* Brand */
.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 10px;
  margin-bottom: 4px;
}

/* New chat button */
.new-chat-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 9px 10px;
  margin-top: 6px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text-2);
  font-size: 13.5px;
  font-family: var(--font);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.new-chat-btn:hover { background: rgba(139,92,246,0.1); color: var(--accent); }

/* Nav */
.nav-section { padding: 4px 12px 8px; flex-shrink: 0; }
.nav-label {
  padding: 10px 10px 4px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.9px;
  text-transform: uppercase;
  color: var(--text-3);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 10px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text-2);
  font-size: 13px;
  font-family: var(--font);
  text-align: left;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.nav-item:hover { background: rgba(139,92,246,0.1); color: var(--accent); }
.nav-item.active { background: rgba(139,92,246,0.12); color: var(--accent); }
.nav-item svg { flex-shrink: 0; opacity: 0.65; }
.nav-item:hover svg, .nav-item.active svg { opacity: 1; }

/* ─── Conversation list ─── */
.conv-section {
  /* 外层 sidebar-scroll 统一滚动后，这里按内容自然撑高，不再自己抢滚动 */
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  padding: 0 12px 4px;
}

/* ─── Sidebar group (项目 / 对话 两个并列可折叠区块) ─── */
.side-group { display: flex; flex-direction: column; }
#projects-group { flex-shrink: 0; }

.side-group-head {
  display: flex; align-items: center;
  padding: 12px 8px 4px;
  gap: 2px;
}
#projects-group .side-group-head { padding-top: 8px; }
.side-group-toggle {
  display: flex; align-items: center; gap: 6px;
  flex: 1; min-width: 0;
  background: none; border: none; cursor: pointer;
  padding: 3px 4px; border-radius: 6px;
  font-size: 13.5px; font-weight: 650; letter-spacing: 0.2px;
  color: var(--text);
  font-family: var(--font); text-align: left;
  transition: color 0.15s;
}
.side-group-toggle:hover { color: var(--accent); }
.side-caret {
  flex-shrink: 0; color: var(--text-3);
  transition: transform 0.15s;
  transform: rotate(90deg);   /* 展开向下 */
}
.side-group.collapsed .side-caret { transform: rotate(0deg); }  /* 收起向右 */
.side-group.collapsed .side-group-body { display: none; }
.side-group-add {
  flex-shrink: 0;
  background: none; border: none; cursor: pointer;
  color: var(--text-3); padding: 3px; border-radius: 6px;
  display: flex; transition: background 0.15s, color 0.15s;
}
.side-group-add:hover { background: rgba(139,92,246,0.1); color: var(--accent); }

/* 滚动统一交给 .sidebar-scroll，分组体自身不再独立滚动（2026-08-07） */
.side-group-body { min-height: 0; }
#projects-body { max-height: 46vh; flex-shrink: 0; }

/* ─── 分组配色（备忘录式上级目录，6 种柔和高级色，非单一紫）─── */
.pg-swatch { display: inline-block; width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.pg-dot-slate  { background: #8A8F98; }
.pg-dot-sage   { background: #7A9A7E; }
.pg-dot-umber  { background: #B08858; }
.pg-dot-mist   { background: #7C93B0; }
.pg-dot-clay   { background: #BC7A66; }
.pg-dot-gold   { background: #BFA059; }
body.private-active .pg-dot-slate  { background: #A0A5AD; }
body.private-active .pg-dot-sage   { background: #8FAE93; }
body.private-active .pg-dot-umber  { background: #C39B6E; }
body.private-active .pg-dot-mist   { background: #93A9C4; }
body.private-active .pg-dot-clay   { background: #CC9280; }
body.private-active .pg-dot-gold   { background: #D3B76E; }

/* ─── Project group row（分组＝上级目录，折叠容纳多个项目）─── */
.pgroup-row { margin-bottom: 2px; }
.pgroup-head {
  display: flex; align-items: center; gap: 7px;
  padding: 7px 6px 7px 8px; border-radius: 8px;
  cursor: pointer; position: relative;
  transition: background 0.15s;
  user-select: none;
}
.pgroup-head:hover { background: rgba(0,0,0,0.045); }
.pgroup-head.drop-target { background: rgba(139,92,246,0.10); box-shadow: inset 0 0 0 1.5px rgba(139,92,246,0.4); }
.pgroup-caret {
  flex-shrink: 0; color: var(--text-3);
  transition: transform 0.15s; transform: rotate(90deg);
  opacity: 0.5;
}
.pgroup-head:hover .pgroup-caret { opacity: 0.85; }
.pgroup-row.collapsed .pgroup-caret { transform: rotate(0deg); }
.pgroup-row.collapsed .pgroup-body { display: none; }
.pgroup-name {
  flex: 1; min-width: 0;
  font-size: 12.5px; font-weight: 700; letter-spacing: 0.3px;
  color: var(--text-2); text-transform: uppercase;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  pointer-events: none;
}
.pgroup-count {
  flex-shrink: 0;
  font-size: 10.5px; font-weight: 600; color: var(--text-3);
  background: rgba(0,0,0,0.05); border-radius: 8px;
  padding: 1px 6px; min-width: 16px; text-align: center;
  pointer-events: none;
}
body.private-active .pgroup-count { background: rgba(255,255,255,0.06); }
.pgroup-menu-btn {
  flex-shrink: 0;
  background: none; border: none; color: var(--text-3);
  cursor: pointer; padding: 3px 5px; border-radius: 5px;
  opacity: 0; font-size: 15px; line-height: 1; letter-spacing: 1.5px;
  transition: opacity 0.15s, background 0.15s;
}
.pgroup-head:hover .pgroup-menu-btn,
.pgroup-menu-btn.open { opacity: 1; }
.pgroup-menu-btn:hover { background: rgba(0,0,0,0.08); }
.pgroup-body { padding-left: 2px; }
.pgroup-rename-input {
  flex: 1; min-width: 0; background: #fff;
  border: 1px solid rgba(26,26,24,0.30); border-radius: 6px; outline: none;
  color: var(--text); font-size: 12.5px; font-weight: 700; letter-spacing: 0.3px;
  text-transform: uppercase; font-family: var(--font); padding: 2px 6px;
}
/* 重命名框聚焦态：边框随墨色加深（2026-07-29 紫色收敛：编辑态应该「像在写字」，
   不是亮彩灯；分组 6 色之外不收新的装饰色） */
.pgroup-rename-input:focus,
.project-rename-input:focus { border-color: rgba(26,26,24,0.55); }
.pgroup-empty { padding: 4px 10px 8px; font-size: 11px; color: var(--text-3); }
/* 未分组项目容器：无标题栏，紧跟在最后一个分组之后 */
.pgroup-ungrouped { margin-top: 2px; }

/* ─── Project row（去掉紫色文件夹图标，改用分组同色的细色条做层级引导）─── */
.project-row { margin-bottom: 1px; }
.project-head {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 8px 7px 6px; border-radius: 8px;
  cursor: pointer; position: relative;
  transition: background 0.15s;
  user-select: none;
}
.project-head:hover { background: rgba(0,0,0,0.05); }
.project-head.drop-target { background: rgba(139,92,246,0.14); box-shadow: inset 0 0 0 1.5px rgba(139,92,246,0.5); }
.project-caret {
  flex-shrink: 0; color: var(--text-3);
  transition: transform 0.15s; transform: rotate(90deg);
  opacity: 0.55;
}
.project-head:hover .project-caret { opacity: 0.9; }
.project-row.collapsed .project-caret { transform: rotate(0deg); }
.project-row.collapsed .project-body { display: none; }
/* 色条：分组内项目继承分组色；未分组项目为中性灰细条 */
.project-bar {
  flex-shrink: 0; width: 3px; height: 13px; border-radius: 2px;
  background: var(--text-3); opacity: 0.45;
}
.project-row[data-group-color="slate"] .project-bar { background: #8A8F98; opacity: 0.85; }
.project-row[data-group-color="sage"]  .project-bar { background: #7A9A7E; opacity: 0.85; }
.project-row[data-group-color="umber"] .project-bar { background: #B08858; opacity: 0.85; }
.project-row[data-group-color="mist"]  .project-bar { background: #7C93B0; opacity: 0.85; }
.project-row[data-group-color="clay"]  .project-bar { background: #BC7A66; opacity: 0.85; }
.project-row[data-group-color="gold"]  .project-bar { background: #BFA059; opacity: 0.85; }
.project-name {
  flex: 1; min-width: 0;
  font-size: 13px; color: var(--text); font-weight: 500;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  pointer-events: none;
}
.project-menu-btn {
  flex-shrink: 0;
  background: none; border: none; color: var(--text-3);
  cursor: pointer; padding: 3px 5px; border-radius: 5px;
  opacity: 0; font-size: 15px; line-height: 1; letter-spacing: 1.5px;
  transition: opacity 0.15s, background 0.15s;
}
.project-head:hover .project-menu-btn,
.project-menu-btn.open { opacity: 1; }
.project-menu-btn:hover { background: rgba(0,0,0,0.08); }
/* 子对话：左侧细引导线，弱化层级让项目名为主 */
.project-body {
  margin-left: 17px;
  padding-left: 9px;
  border-left: 1.5px solid rgba(0,0,0,0.07);
}
.project-body .conv-item { padding: 7px 10px; }
.project-body .conv-title { font-size: 12.5px; }
.proj-empty {
  padding: 5px 10px; font-size: 11px; color: var(--text-3);
}
.project-head.drop-target + .project-body,
.project-row.collapsed .proj-empty { /* keep compact */ }
.project-rename-input {
  flex: 1; min-width: 0; background: #fff;
  border: 1px solid rgba(26,26,24,0.30); border-radius: 6px; outline: none;
  color: var(--text); font-size: 13px; font-family: var(--font); padding: 2px 6px;
}

/* ─── Drag & drop ─── */
.conv-item.dragging { opacity: 0.4; }
.sortable-list.drag-over { background: rgba(0,0,0,0.04); border-radius: 8px; }  /* 2026-07-29 紫色收敛 */

/* ─── Search overlay (点「搜索聊天」弹出) ─── */
#conv-search-overlay {
  position: fixed; inset: 0; z-index: 620;
  background: rgba(0,0,0,0.22); backdrop-filter: blur(4px);
  display: flex; align-items: flex-start; justify-content: center;
  padding-top: 12vh;
}
#conv-search-overlay.hidden { display: none; }
.search-modal {
  background: #fff; border-radius: 16px;
  width: min(640px, 92vw); max-height: 70vh;
  display: flex; flex-direction: column; overflow: hidden;
  box-shadow: 0 24px 64px rgba(0,0,0,0.22);
  border: 1px solid rgba(0,0,0,0.07);
  animation: fadeUp 0.14s ease;
}
.search-modal-head {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 18px; border-bottom: 1px solid var(--border);
}
.search-modal-head svg { flex-shrink: 0; color: var(--text-3); }
#overlay-search {
  flex: 1; border: none; outline: none; background: transparent;
  font-size: 15px; color: var(--text); font-family: var(--font);
}
#overlay-search::placeholder { color: var(--text-3); }
#overlay-results { overflow-y: auto; padding: 6px; min-height: 60px; }
#overlay-results .conv-item { padding: 10px 12px; }

/* ─── Create project / group modal ─── */
#project-create-overlay,
#group-create-overlay {
  position: fixed; inset: 0; z-index: 640;
  background: rgba(18,16,26,0.40);
  backdrop-filter: blur(8px) saturate(1.15);
  -webkit-backdrop-filter: blur(8px) saturate(1.15);
  display: flex; align-items: center; justify-content: center;
  animation: modalOverlayIn 0.18s ease;
}
#project-create-overlay.hidden,
#group-create-overlay.hidden { display: none; }
@keyframes modalOverlayIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes modalIn {
  from { opacity: 0; transform: translateY(12px) scale(0.965); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.project-modal {
  background: #fff; border-radius: 18px;
  width: min(440px, 92vw); padding: 26px 26px 22px;
  box-shadow: 0 32px 80px -16px rgba(18,14,36,0.35), 0 4px 18px rgba(0,0,0,0.08);
  border: 1px solid rgba(0,0,0,0.06);
  animation: modalIn 0.24s cubic-bezier(0.16, 1, 0.3, 1);
}
.project-modal-icon {
  width: 42px; height: 42px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: #F4F4F6; border: 1px solid rgba(0,0,0,0.05);
  color: #52525B; margin-bottom: 16px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
.project-modal-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 18px;
}
.project-modal-head h3 {
  font-size: 17px; font-weight: 600; letter-spacing: 0.01em;
  color: var(--text); font-family: var(--font);
}
.project-modal-close {
  background: none; border: none; color: var(--text-3); cursor: pointer;
  width: 30px; height: 30px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  margin: -4px -6px 0 0;
  transition: background 0.15s, color 0.15s;
}
.project-modal-close:hover { background: rgba(0,0,0,0.06); color: var(--text); }
.project-modal-label {
  display: block; font-size: 13px; font-weight: 600;
  color: var(--text-2); margin-bottom: 8px;
}
#project-name-input,
#group-name-input {
  width: 100%; box-sizing: border-box;
  padding: 11px 13px; font-size: 14px; font-family: var(--font);
  color: var(--text); background: #FAFAFA;
  border: 1px solid rgba(0,0,0,0.10); border-radius: 10px; outline: none;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}
#project-name-input::placeholder,
#group-name-input::placeholder { color: var(--text-3); }
#project-name-input:hover,
#group-name-input:hover { border-color: rgba(0,0,0,0.18); }
#project-name-input:focus,
#group-name-input:focus {
  background: #fff; border-color: rgba(26,26,24,0.50);
  box-shadow: 0 0 0 3.5px rgba(26,26,24,0.07);
}
.project-modal-hint {
  display: flex; gap: 9px; align-items: flex-start;
  margin: 16px 0 22px;
  padding: 12px 14px; border-radius: 10px;
  background: #F7F7F5; border: 1px solid rgba(0,0,0,0.05);
  font-size: 12.5px; line-height: 1.65; color: var(--text-2);
}
.project-modal-hint svg { flex-shrink: 0; color: #A1A1AA; margin-top: 2px; }
/* ─── 分组颜色选择器（新建/编辑分组弹窗共用）─── */
.group-color-picker { display: flex; gap: 12px; margin-top: 2px; }
.group-color-swatch {
  width: 28px; height: 28px; border-radius: 50%; border: none; cursor: pointer;
  position: relative; padding: 0;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.10);
  transition: transform 0.14s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.14s;
}
.group-color-swatch:hover { transform: scale(1.12); }
.group-color-swatch.selected { transform: scale(1.08); }
.group-color-swatch.selected::after {
  content: ""; position: absolute; left: 50%; top: 50%;
  width: 5px; height: 9px;
  border: solid #fff; border-width: 0 2px 2px 0;
  transform: translate(-50%, -62%) rotate(45deg);
}
.group-color-swatch[data-color="slate"] { background: #8A8F98; }
.group-color-swatch[data-color="sage"]  { background: #7A9A7E; }
.group-color-swatch[data-color="umber"] { background: #B08858; }
.group-color-swatch[data-color="mist"]  { background: #7C93B0; }
.group-color-swatch[data-color="clay"]  { background: #BC7A66; }
.group-color-swatch[data-color="gold"]  { background: #BFA059; }

.project-modal-actions { display: flex; justify-content: flex-end; gap: 10px; padding-top: 2px; }
.project-modal-cancel {
  padding: 9px 17px; border-radius: 10px;
  border: 1px solid rgba(0,0,0,0.12); background: #fff;
  color: var(--text-2); font-size: 13.5px; font-weight: 500; font-family: var(--font);
  cursor: pointer; transition: background 0.15s, border-color 0.15s;
}
.project-modal-cancel:hover { background: #F5F5F6; border-color: rgba(0,0,0,0.16); }
.project-modal-create {
  padding: 9px 20px; border-radius: 10px; border: none;
  background: #7C3AED; color: #fff;
  font-size: 13.5px; font-weight: 600; font-family: var(--font);
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(124,58,237,0.35), inset 0 1px 0 rgba(255,255,255,0.14);
  transition: background 0.15s, box-shadow 0.15s, transform 0.06s;
}
.project-modal-create:hover:not(:disabled) { background: #6D28D9; }
.project-modal-create:active:not(:disabled) { transform: scale(0.975); }
.project-modal-create:disabled {
  background: #EFEFF1; color: #A1A1AA; box-shadow: none; cursor: not-allowed;
}

/* ─── Project browser (备忘录式三栏，project-mode 下显示) ─── */
#project-browser { display: none; flex: 1; min-height: 0; flex-direction: row; border-top: 1px solid var(--border); }
#main.project-mode #project-browser { display: flex; }
#main.project-mode #welcome,
#main.project-mode #chat-box,
#main.project-mode #input-wrap,
#main.project-mode #input-footer,
#main.project-mode #private-banner { display: none !important; }