*{box-sizing:border-box}
body{margin:0;font-family:system-ui,sans-serif;color:#222;background:#f6f8fa;-webkit-text-size-adjust:100%}
a{color:#0366d6;text-decoration:none}
button{font-family:inherit}

/* 登录/注册 */
.auth-wrap{min-height:100vh;display:flex;flex-direction:column}
.auth-top{padding:18px 24px;display:flex;justify-content:space-between;align-items:center}
.auth-top .brand{font-weight:700;font-size:16px}
.auth-top a{margin-left:14px;font-size:14px}
.auth-center{flex:1;display:flex;align-items:center;justify-content:center;padding:20px}
.auth-card{width:100%;max-width:400px;background:#fff;border:1px solid #e1e4e8;border-radius:10px;padding:22px}
.auth-card h2{margin:0 0 6px;font-size:20px}
.auth-card .muted{margin-bottom:14px}
.auth-card input{width:100%;padding:10px;border:1px solid #ccc;border-radius:8px;margin-bottom:10px;font-size:15px}
.auth-card .btn{width:100%;padding:10px;font-size:15px}

/* 登录/注册页底部版权备案 */
.auth-footer{
  text-align:center;
  padding:14px 20px calc(14px + env(safe-area-inset-bottom));
  font-size:12px;line-height:1.6;color:#6a737d;
  border-top:1px solid #eaecef;background:#fafbfc;
}
.auth-footer a{color:#0366d6;text-decoration:none}
.auth-footer a:hover{text-decoration:underline}

/* 主布局 */
.app-wrap{display:flex;min-height:100vh}
.main-nav{width:230px;background:#24292e;color:#c9d1d9;flex-shrink:0;padding-top:10px;
          display:flex;flex-direction:column;overflow-y:auto}
.main-nav .brand{color:#fff;font-weight:700;font-size:15px;padding:12px 18px 16px;word-break:break-all}
.main-nav a{display:flex;justify-content:space-between;align-items:center;color:#c9d1d9;
            padding:9px 18px;font-size:14px;border-left:3px solid transparent}
.main-nav a:hover{background:#2f363d;color:#fff}
.main-nav a.active{background:#0366d6;color:#fff;border-left-color:#58a6ff}
.main-nav .section{padding:12px 18px 4px;color:#8b949e;font-size:12px;text-transform:uppercase;letter-spacing:.05em}
.main-nav .spacer{flex:1}
.main-nav .userbox{padding:12px 18px;border-top:1px solid #3a424a;font-size:13px;color:#8b949e}
.badge-dot{display:inline-block;min-width:18px;height:18px;line-height:18px;padding:0 5px;
           background:#d73a49;color:#fff;border-radius:9px;font-size:11px;text-align:center;margin-left:4px}
.main-content{flex:1;min-width:0;padding:24px 28px;max-width:1200px;display:flex;flex-direction:column}
.main-content > footer.auth-footer{
  margin-top:auto;margin-left:-28px;margin-right:-28px;margin-bottom:0;
  background:transparent;border-top:1px solid #eaecef;
}

/* 侧边栏文件夹树 */
.folder-tree{margin:4px 0 8px}
.tree-node{display:flex;align-items:center;gap:2px;border-left:3px solid transparent;padding:2px 0}
.tree-node.active{background:#0366d6;border-left-color:#58a6ff}
.tree-node.active .tree-label{color:#fff;font-weight:600}
.tree-toggle{
  display:inline-block;width:16px;text-align:center;font-size:10px;color:#8b949e;
  cursor:pointer;user-select:none;flex-shrink:0;
}
.tree-toggle:hover{color:#fff}
.tree-toggle-hidden{visibility:hidden;pointer-events:none}
.tree-label{
  flex:1;min-width:0;padding:5px 8px 5px 0;color:#c9d1d9;font-size:13px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.tree-label:hover{color:#fff}
.tree-node.active .tree-label:hover{color:#fff}

/* 通用控件 */
.flash{background:#fff3cd;border:1px solid #ffe08a;padding:8px 12px;border-radius:6px;margin-bottom:12px}
.card{border:1px solid #e1e4e8;border-radius:8px;padding:16px;margin-bottom:18px;background:#fff}
.muted{color:#6a737d;font-size:13px}
.btn{display:inline-block;padding:6px 12px;background:#0366d6;color:#fff;border:none;border-radius:5px;
     cursor:pointer;text-decoration:none;font-size:14px}
.btn.danger{background:#d73a49}
.btn.gray{background:#6a737d}
.btn.small{padding:3px 8px;font-size:12px}
.btn:disabled{opacity:.6;cursor:not-allowed}
input[type=text],input[type=password],input[type=number],input[type=file],input[type=search]{
  padding:6px;border:1px solid #ccc;border-radius:5px}
table{width:100%;border-collapse:collapse;margin-top:12px}
th,td{border-bottom:1px solid #eee;padding:8px;text-align:left;font-size:14px}
th{background:#fafafa}
.progress{height:8px;background:#eee;border-radius:4px;overflow:hidden}
.progress > div{height:100%;background:#0366d6;transition:width .15s ease}

/* 头像 */
.avatar{
  width:36px;height:36px;border-radius:50%;flex-shrink:0;
  color:#fff;font-weight:600;font-size:15px;
  display:flex;align-items:center;justify-content:center;
  user-select:none;
}
.avatar.small{width:28px;height:28px;font-size:13px}

/* 文件列表 */
.file-toolbar{display:flex;gap:8px;margin-bottom:14px;flex-wrap:wrap}
.file-toolbar input[type=search]{flex:1;min-width:180px}
.file-ext{display:flex;gap:4px;align-items:center;margin-top:4px}
.file-ext input{flex:1;min-width:0;font-size:12px;padding:4px 6px}
.file-shared-tag{display:inline-block;margin-left:6px;padding:1px 7px;border-radius:10px;
                 background:#e6ffed;color:#22863a;font-size:12px;border:1px solid #b7f0c4}

/* 文件浏览头部 */
.file-browser-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;flex-wrap:wrap;margin-bottom:12px}
.breadcrumb{font-size:14px;line-height:1.8;color:#6a737d}
.breadcrumb a{color:#0366d6}
.breadcrumb a:hover{text-decoration:underline}
.crumb-sep{color:#ccc;margin:0 4px}

/* 新建文件夹 / 刷新 按钮行 */
.file-actions-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}

/* 上传区 */
.upload-area{
  background:#f6f8fa;
  border:1px dashed #cbd5e1;
  border-radius:10px;
  padding:16px;
}
.upload-area-inner{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.upload-area-icon{font-size:32px;line-height:1}
.upload-area-text{flex:1;min-width:0;font-size:14px;line-height:1.6}
.upload-area-text strong{color:#0366d6}
.upload-area-text .muted{margin-top:2px}
.upload-btns{display:flex;gap:8px;flex-wrap:wrap}

/* 上传进度 */
.upload-panel{margin-top:14px;padding:12px;background:#fff;border:1px solid #e1e4e8;border-radius:8px}
.upload-panel .row{display:flex;justify-content:space-between;font-size:13px;margin-bottom:6px}
.upload-panel .stats{display:flex;justify-content:space-between;font-size:12px;color:#6a737d;margin-top:6px}

/* 分页 */
.pager{display:flex;gap:8px;justify-content:center;align-items:center;margin-top:14px;flex-wrap:wrap}

/* 文件夹卡片网格 */
.folders-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px;margin-bottom:14px}
.folder-card{
  position:relative;background:#fff;border:1px solid #e1e4e8;border-radius:8px;
  padding:14px 12px 10px;cursor:pointer;transition:border-color .15s, box-shadow .15s, transform .15s;
  display:flex;flex-direction:column;align-items:center;text-align:center;min-height:130px;
}
.folder-card:hover{border-color:#0366d6;box-shadow:0 2px 8px rgba(3,102,214,.12);transform:translateY(-1px)}
.folder-icon{font-size:32px;line-height:1;margin-bottom:6px}
.folder-name{font-weight:600;font-size:14px;word-break:break-all;max-width:100%;
             overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;
             -webkit-box-orient:vertical}
.folder-meta{color:#6a737d;font-size:12px;margin-top:4px}
.folder-actions{display:flex;gap:4px;margin-top:8px;flex-wrap:wrap;justify-content:center}

/* 多选 & 批量操作 */
.col-check{width:34px;text-align:center;padding-left:4px !important;padding-right:4px !important}
.col-check input[type=checkbox]{width:16px;height:16px;cursor:pointer}
.batch-bar{
  position:sticky;bottom:16px;display:flex;gap:10px;align-items:center;
  background:#24292e;color:#fff;padding:10px 14px;border-radius:8px;margin-top:14px;
  box-shadow:0 4px 16px rgba(0,0,0,.18);flex-wrap:wrap;
}
.batch-bar span{font-weight:600;margin-right:4px}
.batch-bar .btn{padding:4px 10px;font-size:13px}

/* 弹窗 */
.modal-backdrop{
  position:fixed;inset:0;z-index:200;background:rgba(0,0,0,.45);
  display:flex;align-items:center;justify-content:center;padding:20px;
}
.modal-box{
  background:#fff;border-radius:10px;padding:18px 20px;width:100%;max-width:460px;max-height:80vh;
  display:flex;flex-direction:column;box-shadow:0 8px 32px rgba(0,0,0,.25);
}
.modal-box h3{margin:0 0 12px;font-size:16px}
.folder-picker-tree{
  flex:1;overflow-y:auto;border:1px solid #e1e4e8;border-radius:6px;
  padding:6px;min-height:200px;max-height:50vh;
}
.fp-node{padding:8px 10px;border-radius:4px;cursor:pointer;font-size:14px;user-select:none}
.fp-node:hover{background:#f6f8fa}
.fp-node.selected{background:#eaf3ff;color:#0366d6;font-weight:600}
.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:14px}

/* 拖拽上传遮罩 */
.drop-overlay{
  position:fixed;inset:0;z-index:300;
  background:rgba(3,102,214,.15);
  border:3px dashed #0366d6;
  pointer-events:none;opacity:0;transition:opacity .15s;
  display:flex;align-items:center;justify-content:center;
}
.drop-overlay.active{opacity:1}
.drop-hint{
  background:#fff;border-radius:12px;padding:24px 40px;
  font-size:18px;box-shadow:0 8px 24px rgba(0,0,0,.2);
  text-align:center;
}
.drop-hint-icon{font-size:48px;line-height:1;margin-bottom:8px}

/* ===== 站内信 ===== */
.msg-wrap{display:flex;gap:16px;align-items:flex-start;height:calc(100vh - 150px);min-height:520px}

.msg-sidebar{
  width:280px;flex-shrink:0;background:#fff;border:1px solid #e1e4e8;border-radius:10px;
  display:flex;flex-direction:column;max-height:100%;overflow:hidden;
  box-shadow:0 1px 3px rgba(0,0,0,.04);
}
.msg-sidebar-head{
  padding:14px 16px 10px;display:flex;align-items:center;justify-content:space-between;
  border-bottom:1px solid #f0f0f0;
}
.msg-sidebar-head strong{font-size:15px}
.msg-sidebar-head .muted{font-size:12px}

.msg-search{padding:8px 12px;border-bottom:1px solid #f0f0f0}
.msg-search input[type=search]{
  width:100%;padding:7px 10px;font-size:13px;border:1px solid #dfe2e5;border-radius:6px;
  background:#f6f8fa;transition:background .15s, border-color .15s;
}
.msg-search input[type=search]:focus{outline:none;border-color:#0366d6;background:#fff}

.msg-list{overflow-y:auto;flex:1;min-height:100px}

.conv-item{
  position:relative;
  display:flex;gap:10px;align-items:center;
  padding:10px 14px;color:#222;border-bottom:1px solid #f5f5f5;
  transition:background .12s;
}
.conv-item:hover{background:#f6f8fa}
.conv-item.active{background:#eaf3ff;border-left:3px solid #0366d6;padding-left:11px}
.conv-main{flex:1;min-width:0}
.conv-top{display:flex;align-items:baseline;justify-content:space-between;gap:6px}
.conv-name{font-weight:600;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conv-time{font-size:11px;color:#8b949e;flex-shrink:0}
.conv-bottom{display:flex;align-items:center;justify-content:space-between;margin-top:2px;gap:6px}
.conv-preview{font-size:12px;color:#8b949e;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1}
.msg-unread{
  background:#d73a49;color:#fff;border-radius:10px;padding:1px 7px;font-size:11px;flex-shrink:0;
  font-weight:600;
}

/* 会话删除按钮（hover 显示） */
.conv-del-btn{
  flex-shrink:0;
  width:26px;height:26px;
  border-radius:50%;
  border:none;
  background:transparent;
  color:#8b949e;
  font-size:18px;
  cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  padding:0;
  opacity:0;
  transition:opacity .15s, background .15s, color .15s;
  line-height:1;
}
.conv-item:hover .conv-del-btn{opacity:1}
.conv-del-btn:hover{background:#ffeef0;color:#d73a49}

.msg-new{border-top:1px solid #f0f0f0;display:flex;flex-direction:column;max-height:40%}
.msg-new-head{padding:10px 14px 0;font-size:12px}
.user-pick-list{
  overflow-y:auto;padding:4px 8px 8px;max-height:180px;
}
.user-pick-item{
  display:flex;gap:8px;align-items:center;
  padding:6px 8px;border-radius:6px;cursor:pointer;font-size:13px;
  transition:background .12s;
}
.user-pick-item:hover{background:#eaf3ff}
.user-pick-item span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.msg-empty-tip{
  padding:20px 12px;text-align:center;color:#8b949e;font-size:13px;
}

/* 聊天窗口 */
.msg-chat{
  flex:1;min-width:0;background:#fff;border:1px solid #e1e4e8;border-radius:10px;
  display:flex;flex-direction:column;max-height:100%;overflow:hidden;
  box-shadow:0 1px 3px rgba(0,0,0,.04);
}
.msg-chat-head{
  padding:12px 16px;border-bottom:1px solid #f0f0f0;
  display:flex;align-items:center;gap:10px;background:#fafbfc;
}
.msg-chat-head .back{display:none;font-size:18px;color:#6a737d;text-decoration:none;padding:0 4px}
.msg-chat-title{display:flex;flex-direction:column;gap:1px;min-width:0;flex:1}
.msg-chat-title strong{font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.msg-chat-sub{font-size:11px}

/* 聊天头部删除按钮（右对齐） */
.msg-chat-head .conv-head-del-btn{margin-left:auto;flex-shrink:0}

.msg-body{
  flex:1;overflow-y:auto;padding:18px 16px;background:#f7f8fa;
  display:flex;flex-direction:column;gap:6px;
}

.msg-row{display:flex;gap:8px;align-items:flex-end;margin-bottom:4px}
.msg-row.mine{flex-direction:row;justify-content:flex-end}
.msg-bubble{
  max-width:70%;padding:9px 13px;border-radius:14px;font-size:14px;line-height:1.45;
  position:relative;word-wrap:break-word;
}
.msg-row.mine .msg-bubble{background:#0366d6;color:#fff;border-bottom-right-radius:4px}
.msg-row:not(.mine) .msg-bubble{
  background:#fff;color:#222;border:1px solid #e6e8eb;border-bottom-left-radius:4px;
  box-shadow:0 1px 2px rgba(0,0,0,.03);
}
.msg-text{white-space:pre-wrap;word-break:break-word}
.msg-time{
  font-size:10px;opacity:.65;margin-top:3px;text-align:right;
}
.msg-row:not(.mine) .msg-time{color:#8b949e}

.msg-form{
  padding:12px 14px;border-top:1px solid #f0f0f0;display:flex;gap:8px;background:#fff;
}
.msg-form input[type=text]{
  flex:1;padding:9px 14px;border:1px solid #dfe2e5;border-radius:20px;font-size:14px;
  background:#f6f8fa;transition:background .15s, border-color .15s;
}
.msg-form input[type=text]:focus{outline:none;border-color:#0366d6;background:#fff}
.msg-form .btn{border-radius:20px;padding:8px 18px;font-weight:500}

.msg-empty{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;
}
.msg-empty-icon{font-size:52px;opacity:.5}

.msg-wrap.has-chat .msg-sidebar{display:flex}

@media (max-width: 768px) {
  .msg-wrap{display:block;height:calc(100vh - 120px);min-height:0;gap:0}
  .msg-sidebar,.msg-chat{width:100%;height:100%;max-height:none;border-radius:0;border:none;box-shadow:none}
  .msg-wrap.has-chat .msg-sidebar{display:none}
  .msg-wrap:not(.has-chat) .msg-chat{display:none}
  .msg-chat-head .back{display:inline-block}
  .msg-sidebar-head{padding:12px 14px}
  .msg-new{max-height:38%}
  .user-pick-list{max-height:150px}
  .msg-bubble{max-width:82%;font-size:15px}
  .msg-form{padding-bottom:calc(8px + env(safe-area-inset-bottom))}
  .msg-form input[type=text]{font-size:15px;padding:10px 14px}
  /* 手机端删除按钮常显，触摸更方便 */
  .conv-del-btn{opacity:1}
  .msg-chat-head .conv-head-del-btn{padding:6px 10px;font-size:13px}
}

/* 移动端导航 */
.mobile-bar{display:none}
.nav-backdrop{display:none}
.nav-close{display:none}

@media (max-width: 768px) {
  body{font-size:15px}
  .mobile-bar{display:flex;align-items:center;gap:10px;position:sticky;top:0;z-index:60;
              background:#24292e;color:#fff;padding:10px 14px;padding-top:calc(10px + env(safe-area-inset-top))}
  .mobile-bar .menu-btn{width:40px;height:40px;border-radius:8px;background:#2f363d;color:#fff;
                        border:none;font-size:20px}
  .mobile-bar .bar-title{flex:1;min-width:0;font-weight:600;font-size:15px;white-space:nowrap;
                         overflow:hidden;text-overflow:ellipsis}
  .mobile-bar .bar-user{font-size:12px;color:#c9d1d9}

  .app-wrap{flex-direction:column}
  .main-nav{position:fixed;top:0;left:0;bottom:0;z-index:80;width:78vw;max-width:300px;min-width:220px;
            padding-top:calc(8px + env(safe-area-inset-top));
            padding-bottom:calc(8px + env(safe-area-inset-bottom));
            transform:translateX(-100%);transition:transform .25s ease;
            box-shadow:2px 0 16px rgba(0,0,0,.25)}
  body.nav-open .main-nav{transform:translateX(0)}
  .nav-close{display:inline-block;position:absolute;top:8px;right:10px;width:34px;height:34px;
             border-radius:8px;border:none;background:transparent;color:#c9d1d9;font-size:20px}
  .nav-backdrop{display:block;position:fixed;inset:0;z-index:70;background:rgba(0,0,0,.45);
                opacity:0;pointer-events:none;transition:opacity .25s ease}
  body.nav-open .nav-backdrop{opacity:1;pointer-events:auto}
  .main-nav a{border-left:none;border-bottom:1px solid #2c333a;padding:12px 16px;font-size:15px}
  .main-nav a.active{border-left:none}
  .main-content{width:100%;padding:14px 12px;max-width:none}

  .main-content > footer.auth-footer{
    margin-left:-12px;margin-right:-12px;padding-left:12px;padding-right:12px;
  }

  .file-browser-head{flex-direction:column;align-items:stretch}
  .folders-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
  .folder-card{min-height:120px;padding:12px 10px 8px}
  .folder-icon{font-size:28px}
  .folder-name{font-size:13px}

  .upload-area-inner{flex-direction:column;text-align:center;gap:10px}
  .upload-area-icon{font-size:40px}
  .upload-btns{width:100%}
  .upload-btns .btn{flex:1}

  .card{padding:14px 12px;margin-bottom:14px;border-radius:10px}
  h2{font-size:20px} h3{font-size:17px}
  .btn{padding:9px 14px;font-size:15px}
  .btn.small{padding:6px 10px;font-size:13px}
  input[type=text],input[type=password],input[type=number],input[type=file],input[type=search]{
    font-size:16px;padding:10px;border-radius:8px;width:100%}

  table.responsive-table thead{display:none}
  table.responsive-table, table.responsive-table tbody,
  table.responsive-table tr, table.responsive-table td{display:block;width:100%}
  table.responsive-table tr{border:1px solid #e1e4e8;border-radius:10px;padding:10px 12px;
                            margin-bottom:12px;background:#fff}
  table.responsive-table td{border:none;padding:6px 0}
  table.responsive-table td::before{content:attr(data-label);display:inline-block;min-width:64px;
                                    color:#8b949e;font-size:12px;margin-right:8px}
  table.responsive-table td input[type=text]{width:100% !important;margin-top:4px}
  table.responsive-table td.col-check{padding:0 0 6px !important}
  table.responsive-table td.col-check::before{content:'选择';}

  .batch-bar{bottom:8px;padding:8px 10px;gap:6px}
  .batch-bar .btn{padding:6px 10px;font-size:13px}

  .modal-box{max-height:85vh;padding:16px}

  .drop-hint{padding:18px 24px;font-size:15px}
  .drop-hint-icon{font-size:36px}
}

/* ===== 修改密码卡片 ===== */
.pwd-card{
  max-width:480px;
  margin:0 auto;
  padding:26px 28px;
  box-shadow:0 1px 4px rgba(0,0,0,.06);
}
.pwd-head{
  display:flex;
  gap:14px;
  align-items:flex-start;
  margin-bottom:20px;
  padding-bottom:16px;
  border-bottom:1px solid #eaecef;
}
.pwd-icon{
  width:46px;height:46px;flex-shrink:0;
  background:linear-gradient(135deg,#eaf3ff,#cbe2ff);
  color:#0366d6;
  border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-size:22px;
}
.pwd-head h3{margin:0;font-size:18px}

.form-group{margin-bottom:16px}
.form-label{
  display:block;
  font-size:13px;
  color:#586069;
  font-weight:500;
  margin-bottom:6px;
}
.form-group input[type=password]{
  width:100%;
  box-sizing:border-box;
  padding:11px 12px;
  border:1px solid #d1d5da;
  border-radius:8px;
  font-size:15px;
  transition:border-color .15s, box-shadow .15s;
}
.form-group input[type=password]:focus{
  outline:none;
  border-color:#0366d6;
  box-shadow:0 0 0 3px rgba(3,102,214,.12);
}
.btn.btn-block{
  display:block;
  width:100%;
  padding:11px;
  font-size:15px;
  border-radius:8px;
  margin-top:8px;
}

@media (max-width:768px){
  .pwd-card{padding:20px 18px;max-width:none}
  .pwd-head h3{font-size:16px}
  .pwd-icon{width:42px;height:42px;font-size:20px}
  .form-group input[type=password]{font-size:16px;padding:12px}
  .btn.btn-block{padding:12px;font-size:16px}
}