*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0e1621; --bg2:#17212b; --bg3:#242f3d; --bg4:#182533;
  --border:#25303e; --border2:#3e546a;
  --text:#f5f5f5; --text2:#8899aa; --text3:#6c7883;
  --accent:#8774e1; --accent-h:#9b8aee; --mybubble:#2b5278;
  --danger:#ff6b6b;
}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);height:100vh;overflow:hidden}
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}
::-webkit-scrollbar-track{background:transparent}
button{cursor:pointer;border:none;background:none;color:var(--text);font-family:inherit}
input,textarea{font-family:inherit}

/* ===== 登录 ===== */
#login-screen{display:flex;align-items:center;justify-content:center;height:100vh;background:var(--bg2)}
.login-box{background:var(--bg3);padding:40px;border-radius:12px;width:520px;max-width:95vw}
.login-box h2{text-align:center;margin-bottom:24px;font-size:20px}
.login-box textarea{width:100%;height:200px;background:var(--bg2);border:1px solid var(--border2);border-radius:8px;color:var(--text);padding:12px;font-family:monospace;font-size:12px;resize:vertical}
.login-box textarea:focus{outline:none;border-color:var(--accent)}
.login-box button{margin-top:16px;width:100%;padding:12px;background:var(--accent);color:#fff;border-radius:8px;font-size:16px;font-weight:600}
.login-box button:hover{background:var(--accent-h)}
.login-box button:disabled{opacity:.6}
.login-box .note{margin-top:12px;font-size:12px;color:var(--text2);text-align:center}
.login-box .error{margin-top:12px;color:var(--danger);font-size:13px;text-align:center;display:none}

/* ===== 主布局 ===== */
#app-screen{display:none;height:100vh}
.app-layout{display:flex;height:100vh}

/* ===== 侧边栏 ===== */
.sidebar{width:340px;min-width:280px;background:var(--bg2);border-right:1px solid var(--border);display:flex;flex-direction:column}
.sidebar-header{padding:12px 16px;display:flex;align-items:center;gap:10px;border-bottom:1px solid var(--border);flex-shrink:0}
.sidebar-header .avatar{width:40px;height:40px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:18px;flex-shrink:0}
.sidebar-header .user-info{flex:1;min-width:0}
.sidebar-header .user-name{font-weight:600;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sidebar-header .user-phone{font-size:12px;color:var(--text2)}
.icon-btn{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:16px;color:var(--text2);flex-shrink:0}
.icon-btn:hover{background:var(--bg3);color:var(--text)}
.btn-logout:hover{color:var(--danger)}
.sidebar-search{padding:8px 12px;border-bottom:1px solid var(--border);flex-shrink:0}
.sidebar-search input{width:100%;padding:8px 12px;background:var(--bg3);border:1px solid var(--border2);border-radius:8px;color:var(--text);font-size:13px}
.sidebar-search input::placeholder{color:var(--text3)}
.sidebar-search input:focus{outline:none;border-color:var(--accent)}

.dialog-list{flex:1;overflow-y:auto}

/* ===== 选项卡 ===== */
.tab-bar{display:flex;gap:2px;padding:6px 10px;border-bottom:1px solid var(--border);flex-shrink:0;overflow-x:auto}
.tab-bar::-webkit-scrollbar{height:0}
.tab-btn{flex:1;min-width:52px;padding:7px 4px;background:transparent;color:var(--text2);font-size:12.5px;font-weight:600;border-radius:14px;white-space:nowrap;transition:background .15s,color .15s}
.tab-btn:hover{background:var(--bg3);color:var(--text)}
.tab-btn.active{background:var(--accent);color:#fff}
.tab-btn .tab-count{font-size:10px;opacity:.8;margin-left:2px}
.dialog-item{padding:10px 14px;cursor:pointer;border-bottom:1px solid #1c2733;transition:background .15s;display:flex;align-items:center;gap:10px}
.dialog-item:hover{background:#1f2c3a}
.dialog-item.active{background:var(--mybubble)}
.dialog-item .dl-avatar{width:48px;height:48px;border-radius:50%;background:var(--border2);flex-shrink:0;overflow:hidden;position:relative}
.dialog-item .dl-avatar .av-initial{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:17px;color:#fff;z-index:0}
.dialog-item .dl-avatar img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:1}
.dialog-item .online-dot{position:absolute;bottom:2px;right:2px;width:11px;height:11px;border-radius:50%;background:#4caf50;border:2px solid var(--bg2);z-index:2}
.dialog-item .dl-info{flex:1;min-width:0}
.dialog-item .dl-row1{display:flex;align-items:center;justify-content:space-between;gap:8px}
.dialog-item .dl-name{font-size:14px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dialog-item .dl-time{font-size:11px;color:var(--text3);flex-shrink:0}
.dialog-item .dl-row2{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:2px}
.dialog-item .dl-last{font-size:12px;color:var(--text2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}
.dialog-item .dl-last.unread{color:var(--text)}
.dialog-item .dl-badge{background:var(--accent);color:#fff;font-size:11px;padding:2px 7px;border-radius:10px;flex-shrink:0;min-width:20px;text-align:center}
.dialog-item .dl-badge:empty{display:none}
.dialog-item .dl-pin{font-size:11px;flex-shrink:0;color:var(--text2)}

/* ===== 聊天区 ===== */
.chat-area{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--bg)}
.chat-header{padding:10px 18px;border-bottom:1px solid var(--border);background:var(--bg2);flex-shrink:0;display:flex;align-items:center;gap:12px}
.ch-avatar{width:38px;height:38px;border-radius:50%;background:var(--border2);overflow:hidden;flex-shrink:0;position:relative}
.ch-avatar .av-initial{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:16px;color:#fff;z-index:0}
.ch-avatar img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:1}
.ch-info{flex:1;min-width:0}
.ch-name{font-weight:600;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ch-status{font-size:12px;color:var(--text3)}
.ch-status.online{color:#4caf50}
.ch-actions{display:flex;gap:4px}

.empty-chat{flex:1;display:flex;align-items:center;justify-content:center;color:var(--text3);font-size:15px}

.message-list{flex:1;overflow-y:auto;padding:14px 16px;display:flex;flex-direction:column;gap:3px}
.message-list .date-divider{text-align:center;color:var(--text3);font-size:12px;margin:10px 0;align-self:center;background:var(--bg2);padding:3px 12px;border-radius:12px}
.message-list .load-more{text-align:center;color:var(--text2);font-size:12px;padding:8px;cursor:pointer}
.message-list .load-more:hover{color:var(--accent)}

.message-row{display:flex;flex-direction:column;max-width:72%;animation:fadeIn .18s;position:relative}
.message-row.me{align-self:flex-end}
.message-row.them{align-self:flex-start}
.message-row .msg-sender{font-size:12px;color:var(--accent);margin:0 4px 2px;font-weight:500}
.message-bubble{padding:7px 12px;border-radius:12px;font-size:14px;line-height:1.45;word-wrap:break-word;white-space:pre-wrap;position:relative;cursor:pointer}
.message-row.me .message-bubble{background:var(--mybubble);border-bottom-right-radius:2px}
.message-row.them .message-bubble{background:var(--bg4);border-bottom-left-radius:2px}
.message-bubble .reply-block{border-left:2px solid var(--accent);padding-left:8px;margin-bottom:4px;font-size:12px;color:var(--text2)}
.message-bubble .reply-block .reply-name{color:var(--accent);font-weight:500}
.message-bubble .media-wrap{margin-top:6px;max-width:100%}
.message-bubble .media-img{max-width:280px;max-height:320px;border-radius:8px;display:block;cursor:zoom-in}
.message-bubble .media-file{display:flex;align-items:center;gap:10px;background:rgba(255,255,255,.06);padding:8px 10px;border-radius:8px;margin-top:6px;cursor:pointer}
.message-bubble .media-file .file-icon{font-size:22px}
.message-bubble .media-file .file-info{min-width:0}
.message-bubble .media-file .file-name{font-size:13px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:200px}
.message-bubble .media-file .file-size{font-size:11px;color:var(--text2)}
.message-bubble .media-file .dl-btn{font-size:18px;color:var(--text2);margin-left:auto}
.message-bubble .webpage-block{border-left:2px solid var(--accent);padding-left:8px;margin-top:6px;font-size:13px}
.message-bubble .webpage-block .wp-title{font-weight:600;color:var(--accent)}
.message-bubble .webpage-block .wp-desc{color:var(--text2);font-size:12px}
.message-bubble .msg-edited{font-size:11px;color:var(--text3)}
.message-meta{font-size:11px;color:var(--text2);margin:2px 4px 0;display:flex;align-items:center;gap:4px}
.message-row.me .message-meta{justify-content:flex-end}
.msg-ticks{display:inline-flex;align-items:center;gap:2px}
.tick{font-size:11px;line-height:1}
.tick.read{color:#4fc3f7}
.message-row .msg-views{color:var(--text3)}

.message-bubble .fmt-bold{font-weight:700}
.message-bubble .fmt-italic{font-style:italic}
.message-bubble .fmt-code{font-family:monospace;background:rgba(0,0,0,.25);padding:1px 4px;border-radius:3px;font-size:13px}
.message-bubble .fmt-pre{font-family:monospace;background:rgba(0,0,0,.25);padding:6px 8px;border-radius:6px;display:block;margin:4px 0;white-space:pre-wrap;font-size:13px}
.message-bubble .fmt-link{color:#4fc3f7;text-decoration:underline}
.message-bubble .fmt-strike{text-decoration:line-through}
.message-bubble .fmt-underline{text-decoration:underline}
.message-bubble .fmt-quote{border-left:3px solid var(--accent);padding-left:8px;display:block;margin:4px 0;color:var(--text2)}
.message-bubble .fmt-spoiler{background:#333;color:transparent;cursor:pointer;border-radius:3px}
.message-bubble .fmt-spoiler:hover{color:var(--text)}

@keyframes fadeIn{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}

/* ===== 回复条 ===== */
.reply-bar{padding:8px 16px;border-top:1px solid var(--border);background:var(--bg2);display:flex;align-items:center;gap:10px;flex-shrink:0}
.reply-info{flex:1;border-left:3px solid var(--accent);padding-left:10px;min-width:0}
.reply-title{font-size:12px;color:var(--accent);font-weight:500}
.reply-preview{font-size:13px;color:var(--text2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ===== 输入区 ===== */
.input-area{padding:8px 14px;border-top:1px solid var(--border);display:flex;gap:8px;background:var(--bg2);flex-shrink:0;align-items:flex-end}
.input-box{flex:1;display:flex;flex-direction:column;gap:4px}
.input-toolbar{display:flex;gap:2px}
.fmt-btn{width:24px;height:22px;border-radius:4px;font-size:12px;font-weight:700;color:var(--text2);display:flex;align-items:center;justify-content:center}
.fmt-btn:hover{background:var(--bg3);color:var(--text)}
#msg-input{width:100%;padding:9px 14px;background:var(--bg3);border:1px solid var(--border2);border-radius:20px;color:var(--text);font-size:14px}
#msg-input::placeholder{color:var(--text3)}
#msg-input:focus{outline:none;border-color:var(--accent)}
.send-btn{background:var(--accent);color:#fff;border-radius:50%;width:42px;height:42px;font-size:18px;flex-shrink:0;display:flex;align-items:center;justify-content:center}
.send-btn:hover{background:var(--accent-h)}
.send-btn:disabled{opacity:.5}

/* ===== 弹窗 ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);display:none;align-items:center;justify-content:center;z-index:100}
.modal-overlay.open{display:flex}
.modal-box{background:var(--bg2);border-radius:12px;width:420px;max-width:92vw;max-height:80vh;display:flex;flex-direction:column;overflow:hidden}
.modal-header{padding:14px 18px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);flex-shrink:0}
.modal-title{font-weight:600;font-size:16px}
.modal-search{padding:10px 14px;border-bottom:1px solid var(--border);flex-shrink:0}
.modal-search input{width:100%;padding:8px 12px;background:var(--bg3);border:1px solid var(--border2);border-radius:8px;color:var(--text);font-size:13px}
.modal-search input:focus{outline:none;border-color:var(--accent)}
.modal-list{flex:1;overflow-y:auto;padding:6px}
.modal-item{padding:10px 12px;cursor:pointer;border-radius:8px;display:flex;align-items:center;gap:10px}
.modal-item:hover{background:var(--bg3)}
.modal-item .mi-avatar{width:40px;height:40px;border-radius:50%;background:var(--border2);display:flex;align-items:center;justify-content:center;font-weight:600;color:#fff;flex-shrink:0;overflow:hidden}
.modal-item .mi-avatar img{width:100%;height:100%;object-fit:cover}
.modal-item .mi-name{font-size:14px;font-weight:500}
.modal-item .mi-sub{font-size:12px;color:var(--text2)}
.modal-item .mi-time{font-size:11px;color:var(--text3);margin-left:auto}

/* ===== 图片预览 ===== */
.img-modal-box{position:relative;max-width:90vw;max-height:90vh}
.img-modal-box img{max-width:90vw;max-height:86vh;border-radius:8px}
.img-modal-actions{position:absolute;top:10px;right:10px;display:flex;gap:6px}
.img-modal-actions .icon-btn{background:rgba(0,0,0,.5)}
.img-modal-actions .icon-btn:hover{background:rgba(0,0,0,.8)}

/* ===== 右键菜单 ===== */
.context-menu{position:fixed;background:var(--bg3);border:1px solid var(--border2);border-radius:8px;padding:4px;z-index:200;min-width:140px;box-shadow:0 4px 16px rgba(0,0,0,.4)}
.ctx-item{padding:8px 14px;font-size:13px;border-radius:5px;cursor:pointer;color:var(--text)}
.ctx-item:hover{background:var(--bg4)}
.ctx-danger{color:var(--danger)}
.ctx-item:disabled{color:var(--text3);cursor:default}

/* ===== 空状态 & 错误提示 ===== */
.empty-list{text-align:center;color:var(--text3);padding:32px 16px;font-size:14px}
.error-banner{background:var(--danger);color:#fff;text-align:center;padding:8px 14px;font-size:13px;cursor:pointer;display:none;flex-shrink:0}
.error-banner:hover{opacity:.9}
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--danger);color:#fff;padding:10px 20px;border-radius:8px;font-size:13px;z-index:300;animation:fadeIn .2s;opacity:0;transition:opacity .3s}
.toast.visible{opacity:1}
.loading{text-align:center;color:var(--text2);padding:20px;font-size:13px}
.spinner{display:inline-block;width:20px;height:20px;border:2px solid var(--border2);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ===== 响应式 ===== */
@media (max-width:700px){
  .sidebar{width:100%;min-width:0}
  .app-layout.mobile-chat .sidebar{display:none}
  .app-layout.mobile-chat .chat-area{display:flex}
  .app-layout .chat-area{display:none}
  .app-layout .sidebar{display:flex}
  .app-layout.mobile-chat{flex-direction:column}
}