:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --border: #e2e5ea;
  --accent: #1a6fb5;
  --accent-dark: #155a92;
  --text: #2c3e50;
  --muted: #8a94a3;
  --danger: #c0392b;
  --sidebar-w: 268px;
  --chat-font-size: 14px;   /* 聊天文本字号 */
  --math-scale: 100%;       /* 公式相对缩放 */
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI",
    Roboto, "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

button {
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  font-family: inherit;
}
button:hover { background: #eef2f7; }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button.primary:hover { background: var(--accent-dark); }
button.primary:disabled { background: #9db8d4; cursor: not-allowed; border-color: #9db8d4; }
button.icon {
  padding: 2px 6px;
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 14px;
}
button.icon:hover { color: var(--danger); background: transparent; }

input, select, textarea {
  font-family: inherit;
  font-size: 13px;
  padding: 7px 9px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
}

/* ---------- 聊天页布局 ---------- */
.app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* 侧边栏 */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: margin-left .2s ease;
}
.sidebar.collapsed {
  display: none;
}
.sidebar-header {
  padding: 14px 14px 10px;
  border-bottom: 1px solid var(--border);
}
.sidebar-header h1 { margin: 0 0 10px; font-size: 16px; }
.sidebar-header .new-btn { width: 100%; }
.agent-bar { position: relative; margin-bottom: 8px; }
.agent-selector {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: #f0f3f7;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
}
.agent-selector:hover { background: #e8eef5; }
.agent-selector .agent-avatar { font-size: 18px; }
.agent-selector .agent-name {
  flex: 1;
  font-weight: 600;
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.agent-selector .agent-caret { color: var(--muted); font-size: 12px; }
.agent-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: 4px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,.08);
  z-index: 20;
  max-height: 260px;
  overflow-y: auto;
}
.agent-dropdown .agent-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  cursor: pointer;
}
.agent-dropdown .agent-option:hover { background: #f0f3f7; }
.agent-dropdown .agent-option .a-avatar { font-size: 16px; }
.agent-dropdown .agent-option .a-name {
  flex: 1;
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.agent-dropdown .agent-option .a-edit { color: var(--muted); font-size: 12px; }
.agent-dropdown .agent-option .a-edit:hover { color: var(--accent); }
.agent-dropdown .agent-new {
  padding: 10px 12px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--accent);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
}
.agent-dropdown .agent-new:hover { background: #f0f3f7; }
.conv-list { flex: 1; overflow-y: auto; padding: 6px; }
.conv-item {
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 2px;
  position: relative;
  transition: background .12s;
}
.conv-item:hover { background: #f0f3f7; }
.conv-item.active { background: #e8f0f8; }
.conv-item .title {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding-right: 20px;
}
.conv-item .preview {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 2px;
}
.conv-item .del {
  position: absolute;
  top: 8px;
  right: 6px;
  display: none;
}
.conv-item .rename {
  position: absolute;
  top: 8px;
  right: 26px;
  display: none;
}
.conv-item:hover .del,
.conv-item:hover .rename { display: block; }

/* 主区域 */
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.topbar .model-tag {
  font-size: 12px;
  color: var(--accent);
  background: #e8f0f8;
  padding: 3px 10px;
  border-radius: 12px;
}
.topbar .mood-tag {
  font-size: 12px;
  color: #b7791f;
  background: #fef6e7;
  padding: 3px 10px;
  border-radius: 12px;
  white-space: nowrap;
}
.topbar .spacer { flex: 1; }
.topbar .user-tag { font-size: 13px; color: var(--text); white-space: nowrap; }
.topbar a { color: var(--accent); text-decoration: none; font-size: 13px; }
.topbar a:hover { text-decoration: underline; }
.topbar .toggle-sidebar {
  font-size: 16px;
  padding: 4px 9px;
  line-height: 1;
  cursor: pointer;
}

.chat { flex: 1; overflow-y: auto; padding: 20px 16px; }
.chat-inner { max-width: 860px; margin: 0 auto; }

.msg { margin-bottom: 18px; animation: fade .2s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } }
.msg .role { font-size: 12px; font-weight: 600; color: var(--muted); margin-bottom: 4px; }
.msg .role .time {
  font-weight: 400;
  font-size: 11px;
  color: var(--muted);
  margin-left: 8px;
  opacity: .8;
}
.msg.user .role { text-align: right; color: var(--accent); }
.bubble {
  padding: 12px 14px;
  border-radius: 12px;
  line-height: 1.65;
  word-break: break-word;
  font-size: var(--chat-font-size);
}
/* 公式缩放 */
.bubble mjx-container,
.bubble .MathJax {
  font-size: var(--math-scale);
}
.msg.user .bubble {
  background: var(--accent);
  color: #fff;
  border-top-right-radius: 4px;
  white-space: pre-wrap;
  display: inline-block;
  max-width: 100%;
}
.msg.user .img-wrap { text-align: right; }
.msg.user .img-wrap img {
  max-width: 320px;
  max-height: 320px;
  border-radius: 8px;
  margin-top: 6px;
  border: 1px solid var(--border);
  display: inline-block;
}
.msg.assistant .bubble {
  background: var(--card);
  border: 1px solid var(--border);
  border-top-left-radius: 4px;
}
.streaming { color: var(--muted); white-space: pre-wrap; }

/* 思考过程 */
.reasoning {
  margin-bottom: 10px;
  background: #f7f8fa;
  border: 1px dashed var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.reasoning .rl {
  font-size: 12px;
  color: var(--muted);
  padding: 6px 10px;
  cursor: pointer;
  user-select: none;
}
.reasoning .rbody {
  padding: 0 12px 10px;
  font-size: 13px;
  color: #7a8491;
  white-space: pre-wrap;
  display: none;
  line-height: 1.55;
}
.reasoning.open .rbody { display: block; }

/* 折叠条目 (待办橙色 / 日程紫色) */
.collapsible-note {
  margin-bottom: 10px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid;
}
.collapsible-note.todo {
  border-color: #f0c36a;
  background: #fef8ec;
}
.collapsible-note.event {
  border-color: #c9a8f0;
  background: #f7f1fd;
}
.collapsible-note.semester {
  border-color: #e57373;
  background: #fdecea;
}
.collapsible-note.deleted {
  border-color: #cfd8dc;
  background: #f5f7f8;
}
.collapsible-note .cn-header {
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  cursor: pointer;
  user-select: none;
}
.collapsible-note.todo .cn-header { color: #b7791f; }
.collapsible-note.event .cn-header { color: #7c3aed; }
.collapsible-note.semester .cn-header { color: #c0392b; }
.collapsible-note.deleted .cn-header { color: #78909c; }
.collapsible-note .cn-body {
  padding: 0 12px 10px;
  font-size: 13px;
  display: none;
  line-height: 1.6;
}
.collapsible-note.open .cn-body { display: block; }
.collapsible-note.todo .cn-body { color: #7a5a1a; }
.collapsible-note.event .cn-body { color: #5b3a8c; }
.collapsible-note.semester .cn-body { color: #8c3a2a; }
.collapsible-note.deleted .cn-body { color: #78909c; }
.collapsible-note .cn-line { margin: 2px 0; }

/* Markdown / 代码 */
.bubble code {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
}
.bubble pre {
  background: #f6f8fa;
  border-radius: 8px;
  padding: 12px;
  overflow-x: auto;
}
.bubble pre code { background: none; padding: 0; }
.bubble p { margin: 0 0 8px; }
.bubble p:last-child { margin-bottom: 0; }
.bubble table { border-collapse: collapse; margin: 8px 0; }
.bubble th, .bubble td { border: 1px solid var(--border); padding: 6px 10px; }
.bubble img { max-width: 100%; border-radius: 6px; }
.err { color: var(--danger); }
.loading-hint {
  color: var(--muted);
  font-size: 13px;
  text-align: center;
  padding: 40px 0;
  animation: pulse 1.2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* 消息操作栏 (复制/重试) */
.msg-actions {
  margin-top: 6px;
  display: flex;
  gap: 6px;
}
.msg.assistant .msg-actions { justify-content: flex-start; }
.action-btn {
  font-size: 12px;
  padding: 3px 10px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
}
.action-btn:hover { color: var(--accent); border-color: var(--accent); }

/* 用户消息编辑按钮 */
.edit-msg-btn {
  margin-left: 6px;
  font-size: 11px;
  padding: 1px 6px;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  vertical-align: middle;
}
.edit-msg-btn:hover { color: var(--accent); }

/* 编辑输入框 */
.msg.user .bubble.editing {
  display: block;
  width: 100%;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
}
.edit-input {
  width: 100%;
  min-height: 60px;
  font-size: 13px;
  padding: 8px 10px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  resize: vertical;
  font-family: inherit;
  color: var(--text);
  background: #fff;
}
.edit-actions {
  margin-top: 8px;
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}
.search-note {
  font-size: 12px; color: var(--muted);
  margin: 4px 0; padding: 4px 10px;
  background: #eef4fb; border: 1px solid var(--border); border-radius: 6px;
}

/* 输入区 */
.composer {
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 12px 16px;
}
.composer-inner { max-width: 860px; margin: 0 auto; }
.preview-imgs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.preview-imgs .pimg { position: relative; }
.preview-imgs .pimg img {
  width: 72px; height: 72px; object-fit: cover; border-radius: 8px;
  border: 1px solid var(--border);
}
.preview-imgs .pimg .rm {
  position: absolute; top: -6px; right: -6px;
  background: var(--danger); color: #fff; border-radius: 50%;
  width: 18px; height: 18px; line-height: 16px; text-align: center;
  font-size: 12px; cursor: pointer;
}
.input-row { display: flex; gap: 8px; align-items: flex-end; }
#web-search.active { background: var(--accent); color: #fff; border-color: var(--accent); }
textarea {
  flex: 1; resize: none; min-height: 52px; max-height: 180px;
  padding: 10px 12px; line-height: 1.5;
}
.hint { font-size: 12px; color: var(--muted); margin-top: 6px; }

/* ---------- 设置页 ---------- */
.settings-wrap {
  max-width: 560px;
  margin: 40px auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 28px;
}
.settings-wrap h1 { margin: 0 0 4px; font-size: 20px; }
.settings-wrap .sub { color: var(--muted); font-size: 13px; margin-bottom: 20px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.field input, .field select { width: 100%; }
.field textarea {
  width: 100%;
  resize: vertical;
  font-family: inherit;
  font-size: 13px;
  line-height: 1.5;
}
.field .help { font-size: 12px; color: var(--muted); margin-top: 4px; }
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
}
.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
}
.actions { display: flex; gap: 10px; margin-top: 20px; }

/* ---------- 弹窗 ---------- */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.35);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal {
  width: 480px;
  max-width: 92vw;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--card);
  border-radius: 12px;
  box-shadow: 0 8px 40px rgba(0,0,0,.18);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  font-size: 16px;
  font-weight: 700;
}
.modal-body { padding: 20px; }
.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 14px 20px;
  border-top: 1px solid var(--border);
}

/* ---------- 余额悬浮球 ---------- */
.balance-fab {
  position: fixed;
  top: 60px;
  right: 16px;
  z-index: 90;
  min-width: 56px;
  height: 56px;
  padding: 0 12px;
  border-radius: 28px;
  background: #2c3e50;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  box-shadow: 0 4px 14px rgba(0,0,0,.2);
  transition: background .2s, opacity .2s, transform .15s;
  font-family: inherit;
  border: none;
}
.balance-fab:hover {
  background: #1f2b38;
}
.balance-fab.warn {
  background: #d6a419;
  color: #fff;
}
.balance-fab.danger {
  background: #c0392b;
  color: #fff;
}
.balance-fab .balance-fab-value {
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}
.balance-fab.collapsed {
  opacity: .55;
}
.balance-fab.collapsed .balance-fab-value {
  font-size: 18px;
}

/* ---------- 固定余额装饰区 (侧边栏底部) ---------- */
.sidebar {
  position: relative;
}
.balance-fixed {
  border-top: 1px solid var(--border);
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.balance-deco {
  flex: 1;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  cursor: pointer;
  border-radius: 8px;
  background: #fafbfc;
}
.balance-deco img {
  max-width: 100%;
  max-height: 140px;
  object-fit: contain;
  transition: opacity .15s;
}
.balance-fixed-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  padding: 2px 4px;
}
.balance-emoji { font-size: 18px; }
.balance-text {
  font-size: 15px;
  font-weight: 700;
}
.balance-text.green { color: #27ae60; }
.balance-text.yellow { color: #d6a419; }
.balance-text.red { color: #c0392b; }

/* ---------- 登录页 ---------- */
.login-wrap {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}
.login-card {
  width: 340px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  box-shadow: 0 6px 24px rgba(0,0,0,.06);
}
.login-card h1 { margin: 0 0 4px; font-size: 22px; }
.login-card .sub { color: var(--muted); font-size: 13px; margin-bottom: 20px; }
.login-card .field { margin-bottom: 14px; }
.login-card .field label { display: block; margin-bottom: 5px; font-size: 13px; color: var(--text); }
.login-card .field input { width: 100%; }
.login-card .tabs { display: flex; gap: 4px; margin-bottom: 18px; background: var(--bg); border-radius: 8px; padding: 3px; }
.login-card .tab { flex: 1; padding: 7px 0; border: none; background: transparent; color: var(--muted); font-size: 13px; cursor: pointer; border-radius: 6px; }
.login-card .tab.active { background: var(--card); color: var(--accent); font-weight: 600; box-shadow: 0 1px 3px rgba(0,0,0,.08); }

/* ---------- 管理员用户管理 ---------- */
.user-admin { margin-top: 24px; border-top: 1px solid var(--border); padding-top: 16px; }
.user-admin h2 { font-size: 15px; margin: 0 0 8px; }
.user-admin table { width: 100%; border-collapse: collapse; font-size: 13px; }
.user-admin th, .user-admin td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border); }
.user-admin .row { display: flex; gap: 8px; margin-bottom: 10px; }
.user-admin .row input { flex: 1; }

/* ---------- 待办事项页 ---------- */
.todos-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 40px;
}
.todos-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 10px;
}
.todos-heading h1 { margin: 0 0 4px; font-size: 22px; }
.todos-stats { font-size: 13px; color: var(--muted); }
.todos-nav { display: flex; gap: 14px; }
.todos-nav a { color: var(--accent); text-decoration: none; font-size: 13px; }
.todos-nav a:hover { text-decoration: underline; }

.todo-add {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.todo-add input[type="text"] { flex: 1; min-width: 160px; }
.todo-add select, .todo-add input[type="date"] { flex-shrink: 0; }

.todo-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 8px;
}
.todo-filters { display: flex; gap: 4px; }
.todo-filters .filter {
  padding: 5px 12px;
  font-size: 12px;
  border-radius: 14px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
}
.todo-filters .filter.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.todo-sort { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
.todo-sort select { padding: 4px 8px; }

.todo-list { display: flex; flex-direction: column; gap: 8px; }
.todo-empty {
  text-align: center;
  color: var(--muted);
  padding: 40px 0;
  font-size: 14px;
}
.todo-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: opacity .15s;
}
.todo-item.overdue { border-color: var(--danger); }
.todo-item.completed { opacity: .55; }
.todo-item.completed .todo-title { text-decoration: line-through; color: var(--muted); }
.todo-check {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  margin-top: 1px;
  padding: 0;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: transparent;
  color: #fff;
  font-size: 13px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.todo-check:hover { border-color: var(--accent); }
.todo-item.completed .todo-check { background: var(--accent); border-color: var(--accent); }
.todo-body { flex: 1; min-width: 0; }
.todo-top { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.todo-title { font-size: 14px; font-weight: 600; word-break: break-word; }
.todo-priority {
  font-size: 11px;
  padding: 1px 8px;
  border-radius: 10px;
  white-space: nowrap;
}
.todo-priority.high { background: #fdecea; color: #c0392b; }
.todo-priority.medium { background: #fef6e7; color: #b7791f; }
.todo-priority.low { background: #e8f5e9; color: #2e7d32; }
.todo-category {
  font-size: 11px;
  padding: 1px 8px;
  border-radius: 10px;
  background: #ede7f6;
  color: #5e35b1;
  white-space: nowrap;
}
.todo-due { font-size: 12px; color: var(--muted); white-space: nowrap; }
.todo-due.overdue { color: var(--danger); font-weight: 600; }
.todo-notes {
  margin-top: 4px;
  font-size: 12px;
  color: var(--muted);
  white-space: pre-wrap;
  word-break: break-word;
}
.todo-actions { display: flex; gap: 2px; flex-shrink: 0; }

@media (max-width: 768px) {
  .todos-wrap { padding: 16px 12px 32px; }
  .todo-add input[type="text"] { min-width: 100%; }
}

/* ---------- 日历页 ---------- */
.calendar-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 20px 40px;
}
.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}
.calendar-heading h1 { margin: 0; font-size: 22px; }
.calendar-nav { display: flex; gap: 14px; }
.calendar-nav a { color: var(--accent); text-decoration: none; font-size: 13px; }
.calendar-nav a:hover { text-decoration: underline; }

.calendar-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.calendar-toolbar .month-label {
  font-size: 16px;
  font-weight: 700;
  min-width: 110px;
  text-align: center;
}
.calendar-toolbar .icon { font-size: 18px; padding: 4px 10px; }
.calendar-toolbar .filter {
  padding: 5px 12px;
  font-size: 12px;
  border-radius: 14px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
}

.calendar-grid {
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--card);
}
.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  background: #f7f8fa;
  border-bottom: 1px solid var(--border);
}
.calendar-weekdays span {
  padding: 8px 0;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
}
.calendar-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
}
.cal-day {
  min-height: 84px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 4px;
  cursor: pointer;
  overflow: hidden;
  transition: background .12s;
}
.cal-day:nth-child(7n) { border-right: none; }
.cal-day:hover { background: #f0f3f7; }
.cal-day.empty { cursor: default; background: #fafbfc; }
.cal-day.today .cal-day-num {
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
}
.cal-day.selected { background: #e8f0f8; }
.cal-day-num {
  width: 22px;
  height: 22px;
  line-height: 22px;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 3px;
}
.cal-badge {
  font-size: 10px;
  line-height: 1.4;
  padding: 1px 4px;
  border-radius: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
}
.cal-badge.event { background: #e8f0f8; color: var(--accent); }
.cal-badge.todo { background: #fef6e7; color: #b7791f; }
.cal-badge.week { background: #fdecea; color: #c0392b; }
.cal-badge.more { background: transparent; color: var(--muted); }

/* 选中日期详情 */
.day-panel {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  padding: 14px 16px;
}
.day-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.day-panel-header span { font-size: 15px; font-weight: 700; }
.day-events { display: flex; flex-direction: column; gap: 8px; }
.day-empty { color: var(--muted); font-size: 13px; padding: 8px 0; }
.day-event-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  flex-wrap: wrap;
}
.day-event-time {
  font-size: 12px;
  color: var(--accent);
  background: #e8f0f8;
  padding: 2px 8px;
  border-radius: 10px;
  white-space: nowrap;
}
.day-event-title { flex: 1; font-size: 14px; min-width: 100px; }
.day-event-location {
  font-size: 12px;
  color: #7c3aed;
  background: #f3edff;
  padding: 2px 8px;
  border-radius: 10px;
  white-space: nowrap;
}
.day-event-notes {
  width: 100%;
  font-size: 12px;
  color: var(--muted);
  white-space: pre-wrap;
}
.day-event-actions { display: flex; gap: 2px; }
.day-todo-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  padding: 6px 8px;
  border: 1px dashed var(--border);
  border-radius: 8px;
}

.event-time-row { display: flex; gap: 12px; }
.event-time-row > div { flex: 1; }
.event-time-row input { width: 100%; }

/* 视图切换 */
.view-switch { display: flex; gap: 2px; margin-left: auto; }
.view-btn {
  padding: 4px 12px;
  font-size: 12px;
  border-radius: 6px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
}
.view-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* 周视图 */
.calendar-days.week {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  min-height: 200px;
}
.week-col {
  border-right: 1px solid var(--border);
  padding: 6px;
  min-height: 200px;
  overflow-y: auto;
  cursor: pointer;
  transition: background .12s;
}
.week-col:last-child { border-right: none; }
.week-col:hover { background: #f0f3f7; }
.week-col.today { background: #f0f7ff; }
.week-col.selected { background: #e8f0f8; }
.week-event {
  font-size: 11px;
  background: #e8f0f8;
  color: var(--accent);
  border-radius: 4px;
  padding: 2px 4px;
  margin-bottom: 3px;
  word-break: break-word;
}
.week-todo {
  font-size: 11px;
  background: #fef6e7;
  color: #b7791f;
  border-radius: 4px;
  padding: 2px 4px;
  margin-bottom: 3px;
  word-break: break-word;
}

/* 日视图 */
.calendar-days.day {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  min-height: 120px;
}

/* ICS 面板 */
.ics-panel {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  padding: 14px 16px;
}
.ics-panel-header { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
.ics-desc { font-size: 13px; color: var(--muted); margin: 0 0 10px; line-height: 1.6; }
.ics-row { display: flex; gap: 8px; }
.ics-row input { flex: 1; font-size: 12px; }

/* 学期规则 */
.semester-add-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.semester-add-row input { flex: 1; min-width: 100px; }
.semester-list { display: flex; flex-direction: column; gap: 6px; }
.semester-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
}
.semester-info { word-break: break-word; }

@media (max-width: 768px) {
  .calendar-wrap { padding: 16px 12px 32px; }
  .cal-day { min-height: 52px; padding: 2px; }
  .cal-day-num { width: 18px; height: 18px; line-height: 18px; font-size: 11px; }
  .cal-badge { font-size: 9px; padding: 0 2px; }
  /* 移动端隐藏周/日视图切换, 仅迷你月历 */
  .view-switch { display: none; }
  .ics-row { flex-direction: column; }
  .semester-add-row input { min-width: 100%; }
}

/* ---------- 移动端适配 ---------- */
.sidebar-mask { display: none; }

@media (max-width: 768px) {
  /* 侧边栏变抽屉 */
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 280px;
    min-width: 280px;
    z-index: 60;
    transform: translateX(-100%);
    transition: transform .25s ease;
  }
  .sidebar.collapsed { display: flex; }       /* 移动端忽略桌面折叠态 */
  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0,0,0,.15);
  }
  .sidebar-mask.show {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.35);
    z-index: 50;
  }

  /* 顶栏精简 (保留所有元素, 横向可滚动不隐藏) */
  .topbar { padding: 8px 10px; gap: 8px; overflow-x: auto; flex-wrap: nowrap; }
  .topbar .model-tag { font-size: 11px; padding: 2px 8px; white-space: nowrap; }
  .topbar .mood-tag { font-size: 11px; padding: 2px 8px; white-space: nowrap; }
  .topbar .user-tag { font-size: 12px; white-space: nowrap; }
  .topbar a { font-size: 12px; white-space: nowrap; }

  /* 主内容与气泡 */
  .chat { padding: 14px 10px; }
  .msg { margin-bottom: 14px; }
  .bubble { padding: 10px 12px; }
  .msg.user .bubble { max-width: 85%; }
  .msg.user .img-wrap img {
    max-width: 220px;
    max-height: 220px;
  }
  .reasoning .rbody { font-size: 12px; }
  .search-note { font-size: 11px; }

  /* 输入区 */
  .composer { padding: 10px 10px 12px; }
  .input-row { gap: 6px; }
  .input-row button { padding: 8px 10px; }
  textarea { min-height: 46px; padding: 9px 10px; }

  /* 设置页 / 登录页 */
  .settings-wrap {
    margin: 12px 8px;
    padding: 18px 16px;
    border-radius: 10px;
  }
  .login-wrap { padding: 0 16px; }
  .login-card { width: 100%; max-width: 360px; padding: 22px 20px; }

  /* 弹窗 */
  .modal { width: 92vw; }
  .modal-header { padding: 12px 16px; }
  .modal-body { padding: 16px; }
  .modal-footer { padding: 12px 16px; }

  /* 悬浮球下移, 避开输入区 */
  .balance-fab {
    top: auto;
    bottom: 84px;
    right: 12px;
    height: 48px;
    min-width: 48px;
    border-radius: 24px;
  }
  .balance-fab .balance-fab-value { font-size: 13px; }
}