/* 骨架布局：左侧导航栏 + 工作区（会话列表/聊天、管理页等）+ 移动端底部导航。 */
.app { display: flex; height: 100dvh; min-height: 0; background: var(--bg); overflow: hidden; }
.app[aria-busy='true'] { visibility: hidden; }

/* ============ 左侧导航 ============ */
.rail {
  width: var(--rail-w); flex: none; display: flex; flex-direction: column; align-items: center;
  padding: 14px 0 12px; background: var(--surface); border-right: 1px solid var(--border); z-index: 20;
}
.rail-brand { display: block; width: 42px; height: 42px; border-radius: 13px; overflow: hidden; box-shadow: var(--shadow-1); }
.rail-brand img { width: 100%; height: 100%; }
.rail-nav { display: flex; flex-direction: column; gap: 6px; margin-top: 22px; flex: 1; }
.rail-item {
  position: relative; display: flex; flex-direction: column; align-items: center; gap: 3px;
  width: 58px; padding: 8px 0 6px; border-radius: var(--radius); color: var(--text-3);
  transition: color var(--speed) var(--ease), background var(--speed) var(--ease);
}
.rail-item svg { width: 22px; height: 22px; }
.rail-item .rail-label { font-size: 11px; font-weight: 500; letter-spacing: 0.01em; }
.rail-item:hover { background: var(--surface-3); color: var(--text-2); }
.rail-item.active { background: var(--brand-soft); color: var(--brand-700); }
.rail-item.active::before { content: ''; position: absolute; left: -9px; top: 50%; transform: translateY(-50%); width: 3px; height: 22px; border-radius: 3px; background: var(--brand); }
.rail-item .nav-badge {
  position: absolute; top: 2px; right: 6px; min-width: 17px; height: 17px; padding: 0 4px;
  border-radius: 999px; background: var(--danger); color: #fff; font-size: 10.5px; font-weight: 700;
  display: flex; align-items: center; justify-content: center; border: 2px solid var(--surface);
}
.rail-foot { display: flex; flex-direction: column; align-items: center; gap: 8px; margin-top: auto; }
.rail-avatar { border-radius: 50%; }
.rail-status { display: flex; align-items: center; gap: 4px; font-size: 10px; color: var(--text-3); }
.rail-status .dot { width: 6px; height: 6px; }

/* ============ 工作区 ============ */
.workspace { flex: 1; min-width: 0; min-height: 0; position: relative; display: flex; flex-direction: column; }
.page-view { flex: 1; min-height: 0; overflow-y: auto; }
.page-inner { max-width: 1120px; margin: 0 auto; padding: 28px 28px 48px; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-5); flex-wrap: wrap; }
.page-head h1 { font-size: 24px; letter-spacing: -0.02em; }
.page-head .sub { color: var(--text-3); font-size: 13px; margin-top: 4px; }
.section-title { display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 650; color: var(--text-2); margin: 26px 0 10px; letter-spacing: 0.01em; }
.section-title:first-child { margin-top: 0; }
.grid { display: grid; gap: var(--space-4); }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ============ 聊天布局 ============ */
.chat-layout { flex: 1; min-height: 0; display: grid; grid-template-columns: var(--list-w) minmax(0, 1fr); position: relative; }
.conversation-panel {
  display: flex; flex-direction: column; min-height: 0; background: var(--surface);
  border-right: 1px solid var(--border); position: relative; z-index: 5;
}
.list-head { padding: 14px 14px 10px; display: flex; flex-direction: column; gap: 10px; border-bottom: 1px solid var(--border); }
.list-title-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.list-title-row h1 { font-size: 19px; letter-spacing: -0.02em; }
.list-filters { display: flex; gap: 4px; }
.list-filter {
  height: 28px; padding: 0 10px; border-radius: 999px; font-size: 12.5px; color: var(--text-2);
  background: transparent; transition: background var(--speed), color var(--speed);
}
.list-filter:hover { background: var(--surface-3); }
.list-filter.active { background: var(--brand-soft); color: var(--brand-700); font-weight: 600; }
.list-filter .count { opacity: 0.65; font-size: 11px; margin-left: 3px; }
.list-scroll { flex: 1; overflow-y: auto; overscroll-behavior: contain; padding: 6px; }
.list-empty { padding: 40px 20px; text-align: center; color: var(--text-3); font-size: 13px; }
.list-foot { padding: 8px 14px; border-top: 1px solid var(--border); display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--text-3); }

.conversation-item {
  position: relative; display: flex; gap: 11px; align-items: center; padding: 10px 10px;
  border-radius: var(--radius); cursor: pointer; transition: background var(--speed) var(--ease);
  user-select: none;
}
.conversation-item:hover { background: var(--surface-2); }
.conversation-item.active { background: var(--brand-tint); }
.conversation-item.active::before { content: ''; position: absolute; left: 0; top: 14px; bottom: 14px; width: 3px; border-radius: 3px; background: var(--brand); }
.conversation-item .ci-body { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.conversation-item .ci-top { display: flex; align-items: center; gap: 6px; }
.conversation-item .ci-name { font-weight: 600; font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conversation-item .ci-time { margin-left: auto; font-size: 11px; color: var(--text-3); flex: none; }
.conversation-item .ci-bottom { display: flex; align-items: center; gap: 6px; }
.conversation-item .ci-preview { font-size: 12.5px; color: var(--text-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conversation-item.unread .ci-preview { color: var(--text-2); font-weight: 550; }
.conversation-item .ci-flags { margin-left: auto; display: flex; align-items: center; gap: 4px; flex: none; }
.conversation-item .ci-flags svg { width: 13px; height: 13px; color: var(--text-3); }
.conversation-item .ci-badge { min-width: 18px; height: 18px; padding: 0 5px; border-radius: 999px; background: var(--danger); color: #fff; font-size: 11px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.conversation-item .ci-badge.muted { background: var(--surface-3); color: var(--text-3); }
.avatar-badge { position: relative; }

/* 聊天主区 */
.chat-main { display: flex; flex-direction: column; min-width: 0; min-height: 0; background: var(--bg); position: relative; }
.chat-main.empty { align-items: center; justify-content: center; }
.chat-header {
  height: var(--header-h); flex: none; display: flex; align-items: center; gap: 10px;
  padding: 0 16px; border-bottom: 1px solid var(--border); background: var(--surface); z-index: 6;
}
.chat-header .peer { display: flex; align-items: center; gap: 10px; min-width: 0; }
.chat-header .peer-text { min-width: 0; }
.chat-header .peer-name { font-weight: 650; font-size: 15px; display: flex; align-items: center; gap: 6px; }
.chat-header .peer-sub { font-size: 12px; color: var(--text-3); display: flex; align-items: center; gap: 5px; }
.chat-header .head-actions { margin-left: auto; display: flex; align-items: center; gap: 2px; }
.mobile-only { display: none !important; }

.message-area { flex: 1; min-height: 0; position: relative; display: flex; flex-direction: column; }
.message-scroll { flex: 1; overflow-y: auto; overscroll-behavior: contain; scroll-behavior: auto; padding: 18px clamp(16px, 4vw, 44px) 8px; }
.message-inner { max-width: var(--composer-max); margin: 0 auto; display: flex; flex-direction: column; gap: 3px; }
.history-hint { align-self: center; margin: 6px 0 14px; font-size: 12px; color: var(--text-3); padding: 4px 12px; border-radius: 999px; background: var(--surface-3); }
.history-hint[disabled] { opacity: 0.6; }
.date-sep { align-self: center; margin: 16px 0 10px; font-size: 11.5px; color: var(--text-3); background: color-mix(in srgb, var(--bg) 70%, var(--surface)); padding: 3px 10px; border-radius: 999px; }
.chat-empty { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; color: var(--text-3); text-align: center; padding: 32px; }
.chat-empty .logo { width: 84px; height: 84px; border-radius: 24px; box-shadow: var(--shadow-2); }
.chat-empty h2 { font-size: 20px; color: var(--text); }
.chat-empty p { font-size: 13px; max-width: 340px; }

/* 底部输入区 */
.composer-wrap { flex: none; padding: 0 clamp(12px, 3vw, 36px) max(12px, env(safe-area-inset-bottom)); background: linear-gradient(to top, var(--bg) 78%, transparent); }
.composer {
  max-width: var(--composer-max); margin: 0 auto; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-1);
  padding: 8px 8px 8px 12px; display: flex; flex-direction: column; gap: 6px;
  transition: border-color var(--speed), box-shadow var(--speed);
}
.composer:focus-within { border-color: color-mix(in srgb, var(--brand) 55%, var(--border)); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 10%, transparent), var(--shadow-1); }
.composer-toolbar { display: flex; align-items: center; gap: 2px; }
.composer-row { display: flex; align-items: flex-end; gap: 6px; }
.composer textarea {
  flex: 1; min-height: 26px; max-height: 168px; padding: 5px 4px; border: none; background: transparent;
  resize: none; outline: none; font-size: 14.5px; line-height: 1.5; color: var(--text);
}
.composer textarea::placeholder { color: var(--text-3); }
.composer-meta { display: flex; align-items: center; gap: 8px; padding: 0 4px 2px; font-size: 11.5px; color: var(--text-3); min-height: 16px; }
.composer-meta .error { color: var(--danger); }
.send-btn {
  width: 40px; height: 40px; border-radius: 12px; background: var(--brand); color: #fff;
  display: grid; place-items: center; flex: none; transition: background var(--speed), transform 80ms, opacity var(--speed);
}
.send-btn svg { width: 20px; height: 20px; }
.send-btn:hover:not(:disabled) { background: var(--brand-600); }
.send-btn:active:not(:disabled) { transform: scale(0.95); }
.send-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* 附件预览 / 录音状态 / 拖拽遮罩 */
.attachment-strip { display: flex; flex-wrap: wrap; gap: 8px; padding: 2px 2px 6px; }
.attachment-chip { position: relative; display: flex; align-items: center; gap: 8px; padding: 6px 10px 6px 6px; background: var(--surface-3); border-radius: var(--radius); font-size: 12px; max-width: 240px; }
.attachment-chip .thumb { width: 34px; height: 34px; border-radius: 7px; object-fit: cover; background: var(--surface); flex: none; }
.attachment-chip .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.attachment-chip .remove { position: absolute; top: -6px; right: -6px; width: 18px; height: 18px; border-radius: 50%; background: var(--text); color: var(--bg); display: grid; place-items: center; font-size: 11px; }
.drop-overlay {
  position: absolute; inset: 0; z-index: 30; background: color-mix(in srgb, var(--brand) 8%, var(--bg) 60%);
  border: 2px dashed var(--brand); border-radius: var(--radius-lg); display: grid; place-items: center;
  color: var(--brand-700); font-weight: 600; pointer-events: none; margin: 10px;
}

.typing-indicator { display: inline-flex; align-items: center; gap: 4px; height: 16px; }
.typing-indicator i { width: 5px; height: 5px; border-radius: 50%; background: var(--text-3); animation: typing-bounce 1.2s infinite; }
.typing-indicator i:nth-child(2) { animation-delay: 0.15s; }
.typing-indicator i:nth-child(3) { animation-delay: 0.3s; }
@keyframes typing-bounce { 0%, 60%, 100% { transform: none; opacity: 0.4; } 30% { transform: translateY(-4px); opacity: 1; } }

/* 断网横幅 */
.connection-banner {
  position: absolute; top: 0; left: 0; right: 0; z-index: 50; padding: 6px 12px; font-size: 12.5px;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--warning-soft); color: var(--warning); border-bottom: 1px solid color-mix(in srgb, var(--warning) 25%, transparent);
}

/* ============ 移动端 ============ */
@media (max-width: 1024px) {
  :root { --list-w: 284px; --rail-w: 66px; }
  .rail-item { width: 52px; }
  .page-inner { padding: 20px 18px 40px; }
  .grid.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid.cols-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  :root { --rail-w: 0px; --header-h: 58px; }
  .app { flex-direction: column-reverse; }
  .rail {
    width: 100%; height: calc(58px + env(safe-area-inset-bottom)); flex-direction: row;
    padding: 0 6px env(safe-area-inset-bottom); border-right: none; border-top: 1px solid var(--border);
    justify-content: space-around; flex: none;
  }
  .rail-brand, .rail-foot { display: none; }
  .rail-nav { flex-direction: row; margin: 0; flex: 1; justify-content: space-around; gap: 0; }
  .rail-item { flex: 1; width: auto; height: 54px; justify-content: center; gap: 2px; border-radius: 10px; }
  .rail-item svg { width: 21px; height: 21px; }
  .rail-item .rail-label { font-size: 10px; }
  .rail-item.active::before { display: none; }
  .rail-item .nav-badge { top: 6px; right: 50%; margin-right: -22px; }
  .chat-layout { grid-template-columns: minmax(0, 1fr); }
  .conversation-panel { border-right: none; }
  .chat-main {
    position: absolute; inset: 0; z-index: 10; transform: translateX(100%);
    transition: transform 240ms var(--ease); background: var(--bg);
  }
  .chat-layout.mobile-chat-open .chat-main { transform: none; }
  .mobile-only { display: inline-flex !important; }
  .desktop-only { display: none !important; }
  .message-scroll { padding: 12px 12px 4px; }
  .composer-wrap { padding: 0 8px max(8px, env(safe-area-inset-bottom)); }
  .composer { border-radius: var(--radius); }
  .toast-stack { bottom: calc(76px + env(safe-area-inset-bottom)); }
  .page-inner { padding: 16px 14px 90px; }
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: minmax(0, 1fr); }
  .modal-box { border-radius: var(--radius-lg); }
  .page-head h1 { font-size: 20px; }
  .date-sep { margin: 10px 0 6px; }
}

@media (min-width: 761px) {
  .mobile-only { display: none !important; }
}