/* ============================================================
   chatgpt theme — layout.css
   侧边栏 / 主区 / 顶栏 / 输入框布局 + 收起态 + 响应式
   ============================================================ */

/* ══════════ 侧边栏 ══════════ */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-w);
  display: flex;
  flex-direction: column;
  background: var(--bg-sidebar);
  z-index: 40;
  padding: 0.625rem 0.625rem 0.625rem;
  transition: transform 0.28s ease;
}

.sidebar__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.125rem 0.25rem 0.625rem;
}

.sidebar__brand {
  display: inline-flex;
  align-items: center;
  border-radius: 10px;
}

.sidebar__brand-logo {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}

.sidebar__brand-logo--fallback {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  background: var(--hover);
}
.sidebar__brand-logo--fallback svg {
  width: 15px;
  height: 15px;
}

/* 搜索入口 */
.sidebar__search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.4375rem 0.625rem;
  border-radius: 8px;
  color: var(--text-3);
  background: var(--hover);
  font-size: 0.8125rem;
  text-align: left;
  transition: background-color 0.15s ease;
  margin-bottom: 0.625rem;
}
.sidebar__search:hover {
  background: var(--active);
  color: var(--text-2);
}
.sidebar__search svg {
  width: 14px;
  height: 14px;
  flex: none;
}
.sidebar__search span {
  flex: 1;
}
.sidebar__search-kbd {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  color: var(--text-3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0 0.25rem;
  line-height: 1.5;
}

/* 导航 */
.sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.sidebar__nav-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.625rem;
  border-radius: 8px;
  font-size: 0.875rem;
  color: var(--text);
  transition: background-color 0.15s ease;
}
.sidebar__nav-item:hover {
  background: var(--hover);
}
.sidebar__nav-item.is-active {
  background: var(--active);
  font-weight: 600;
}
.sidebar__nav-icon {
  display: inline-flex;
  color: var(--text-2);
  flex: none;
}
.sidebar__nav-icon svg {
  width: 16px;
  height: 16px;
}
.sidebar__nav-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  line-height: 1.5;
}

/* 最近文章（JS 填充；滚动条隐藏） */
.sidebar__recent {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  margin-top: 0.875rem;
  padding-bottom: 0.5rem;
  scrollbar-width: none;
}
.sidebar__recent::-webkit-scrollbar {
  display: none;
}

.sidebar__recent-title {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-3);
  padding: 0 0.625rem;
  margin-bottom: 0.25rem;
  letter-spacing: 0.03em;
}

.sidebar__recent-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.sidebar__recent-list a {
  display: block;
  padding: 0.375rem 0.625rem;
  border-radius: 8px;
  font-size: 0.8125rem;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: background-color 0.15s ease;
}
.sidebar__recent-list a:hover {
  background: var(--hover);
}
.sidebar__recent-list a.is-active {
  background: var(--active);
  font-weight: 600;
}

/* 底部用户卡片 + 弹出菜单 */
.sidebar__foot {
  position: relative;
  margin-top: 0.25rem;
}

.sidebar__user {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.5rem 0.625rem;
  border-radius: 10px;
  text-align: left;
  transition: background-color 0.15s ease;
}
.sidebar__user:hover {
  background: var(--hover);
}
.sidebar__user-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  object-fit: cover;
  flex: none;
}
.sidebar__user-avatar--fallback {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--active);
  color: var(--text-2);
}
.sidebar__user-avatar--fallback svg {
  width: 15px;
  height: 15px;
}
.sidebar__user-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.35;
  flex: 1;
}
.sidebar__user-name {
  font-size: 0.8125rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sidebar__user-desc {
  font-size: 0.6875rem;
  color: var(--text-3);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sidebar__user-chevron {
  width: 14px;
  height: 14px;
  color: var(--text-3);
  flex: none;
  transition: transform 0.2s ease;
}
.sidebar__user[aria-expanded="true"] .sidebar__user-chevron {
  transform: rotate(180deg);
}

/* 用户弹出菜单 */
.user-menu {
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(100% + 6px);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  padding: 0.375rem;
  z-index: 50;
}
.user-menu__item {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  width: 100%;
  padding: 0.4375rem 0.625rem;
  border-radius: 8px;
  font-size: 0.8125rem;
  color: var(--text);
  text-align: left;
  transition: background-color 0.15s ease;
}
.user-menu__item:hover {
  background: var(--hover);
}
.user-menu__item svg {
  width: 15px;
  height: 15px;
  color: var(--text-2);
  flex: none;
}
.user-menu__sep {
  height: 1px;
  background: var(--border);
  margin: 0.25rem 0.375rem;
}

/* 遮罩（移动端抽屉） */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 39;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s ease;
}
body.sidebar-open .sidebar-overlay {
  opacity: 1;
  pointer-events: auto;
}

/* ══════════ 桌面端收起态 ══════════ */
html.sidebar-collapsed .sidebar {
  transform: translateX(-100%);
}
html.sidebar-collapsed .main {
  margin-left: 0;
}

/* ══════════ 主区 ══════════ */
.main {
  margin-left: var(--sidebar-w);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  transition: margin-left 0.28s ease;
}

/* ── 顶栏 ── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.topbar__left,
.topbar__right {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* 展开按钮：桌面端仅收起后显示；移动端始终显示 */
.topbar__menu {
  display: none;
}
html.sidebar-collapsed .topbar__menu {
  display: inline-flex;
}

.topbar__title {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.375rem 0.75rem;
  border-radius: 10px;
  font-size: 1.0625rem;
  font-weight: 600;
  transition: background-color 0.15s ease;
}
.topbar__title:hover {
  background: var(--hover);
}
.topbar__chevron {
  width: 15px;
  height: 15px;
  color: var(--text-3);
}

/* 主题切换按钮：按当前模式只显示其一（深色显示太阳，浅色显示月亮） */
#theme-toggle .icon-sun,
.user-menu .icon-sun {
  display: none;
}
#theme-toggle .icon-moon,
.user-menu .icon-moon {
  display: block;
}
html[data-theme="dark"] #theme-toggle .icon-sun,
html[data-theme="dark"] .user-menu .icon-sun {
  display: block;
}
html[data-theme="dark"] #theme-toggle .icon-moon,
html[data-theme="dark"] .user-menu .icon-moon {
  display: none;
}

/* ── 内容区（对话流） ── */
.content {
  flex: 1;
  width: 100%;
}

.chat-thread {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 1.5rem 1.5rem 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* ── 底部输入框区域 ── */
.composer-wrap {
  position: sticky;
  bottom: 0;
  z-index: 30;
  padding: 0.5rem 1.5rem 0;
  background: linear-gradient(to top, var(--bg) 78%, transparent);
}

.composer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 0.5rem 0.625rem;
  background: var(--composer-bg);
  border: 1px solid var(--border);
  border-radius: 1.75rem;
  box-shadow: var(--composer-shadow);
}
html[data-theme="dark"] .composer {
  border-color: transparent;
}

.composer__plus {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  color: var(--text-2);
  flex: none;
  cursor: default;
}
.composer__plus svg {
  width: 18px;
  height: 18px;
}

.composer__input {
  flex: 1;
  min-width: 0;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
  padding: 0.375rem 0;
}
.composer__input::placeholder {
  color: var(--text-3);
}

.composer__send {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--text);
  color: var(--bg);
  flex: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.composer__send:hover {
  opacity: 0.85;
}
.composer__send:active {
  transform: scale(0.92);
}
.composer__send svg {
  width: 16px;
  height: 16px;
}

.composer__note {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 0.4375rem 0 0.625rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-3);
}

.composer-wrap--empty {
  padding-top: 0;
}

/* ══════════ 响应式：≤920px 抽屉化 ══════════ */
@media (max-width: 920px) {
  .sidebar {
    transform: translateX(-100%);
    width: min(78vw, 320px);
    box-shadow: none;
  }
  body.sidebar-open .sidebar {
    transform: translateX(0);
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.25);
  }
  /* 移动端不受桌面收起态影响 */
  html.sidebar-collapsed .sidebar {
    transform: translateX(-100%);
  }
  html.sidebar-collapsed body.sidebar-open .sidebar,
  body.sidebar-open .sidebar {
    transform: translateX(0);
  }

  /* 移动端侧栏内的收起按钮改为关闭抽屉 */
  .main {
    margin-left: 0;
  }

  .topbar {
    padding: 0.375rem 0.625rem;
  }
  .topbar__menu {
    display: inline-flex;
  }

  .chat-thread {
    padding: 1rem 1rem 2rem;
    gap: 1.5rem;
  }

  .composer-wrap {
    padding: 0.375rem 0.75rem 0;
  }
  .composer__note {
    padding-bottom: max(0.5rem, env(safe-area-inset-bottom));
  }
}