*{margin:0;padding:0;box-sizing:border-box}
html{touch-action:manipulation;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background:#f5f5f5;height:100vh;overflow:hidden;-webkit-overflow-scrolling:touch}
.page{width:100%;height:100vh;display:flex;flex-direction:column}
.hidden{display:none!important}
#loginPage{justify-content:center;align-items:center;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%)}
.login-card{background:#fff;padding:40px;border-radius:16px;box-shadow:0 10px 40px rgba(0,0,0,.2);width:90%;max-width:400px}
.login-card h1{text-align:center;margin-bottom:30px;color:#333}
.login-card input{width:100%;padding:14px;margin-bottom:16px;border:1px solid #ddd;border-radius:8px;font-size:16px}
.login-card button{width:100%;padding:14px;background:#667eea;color:#fff;border:none;border-radius:8px;font-size:16px;cursor:pointer;margin-bottom:10px}
.error{color:#dc2626;text-align:center;margin-top:10px;font-size:14px}
#chatPage{background:#f5f5f5}
.chat-header{background:#fff;padding:12px 16px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 2px 8px rgba(0,0,0,.1);flex-shrink:0}
.header-left h2{font-size:18px;color:#333}.header-left span{font-size:12px;color:#666}
.header-right{display:flex;align-items:center;gap:10px}.header-right span{font-size:14px;color:#667eea}
.icon-btn{background:none;border:none;font-size:20px;cursor:pointer;padding:5px}
/* 置顶通知栏 */
.notice-bar{flex-shrink:0;background:linear-gradient(135deg,#fff8e1 0%,#fff3c4 100%);border-bottom:1px solid #f0d060;box-shadow:0 2px 6px rgba(0,0,0,.06);z-index:10;overflow:hidden;transition:all .3s ease}
.notice-bar-collapsed{display:flex;align-items:center;padding:10px 16px;cursor:pointer;gap:8px;min-height:42px}
.notice-icon{font-size:16px;flex-shrink:0}
.notice-preview{flex:1;font-size:13px;color:#8b6914;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:500}
.notice-toggle{font-size:10px;color:#b8860b;flex-shrink:0;transition:transform .3s ease}
.notice-toggle.expanded{transform:rotate(180deg)}
.notice-full{padding:0 16px 12px 40px;animation:noticeSlideDown .25s ease}
.notice-full-text{font-size:14px;color:#5d4e14;line-height:1.7;white-space:pre-wrap;word-break:break-word;max-height:200px;overflow-y:auto;padding:8px 12px;background:rgba(255,255,255,.5);border-radius:8px}
@keyframes noticeSlideDown{from{opacity:0;max-height:0}to{opacity:1;max-height:300px}}
.messages-wrapper{flex:1;min-height:0;position:relative;overflow:hidden;display:flex;flex-direction:column}
.messages-wrapper>.bg-video-layer,.preview-messages>.bg-video-layer{position:absolute;top:0;left:0;width:100%;height:100%;z-index:0;pointer-events:none;overflow:hidden}
.bg-video-layer>video{width:100%;height:100%;object-fit:cover;display:block}
.bg-video-layer>iframe{border:none}
.bg-video-layer.fit-cover>iframe{position:absolute;top:50%;left:50%;width:300%;height:300%;transform:translate(-50%,-50%);min-width:100%;min-height:100%}
.bg-video-layer.fit-contain>iframe{width:100%;height:100%}
.bg-video-layer.fit-contain>video{object-fit:contain}
.bg-video-layer.fit-stretch>iframe{width:100%;height:100%}
.bg-video-layer.fit-stretch>video{object-fit:fill}
.messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px;min-height:0;background-color:#f5f5f5;background-position:center;transition:background-color .3s;position:relative;z-index:1}
.messages>*{position:relative;z-index:1}
.load-more{text-align:center;padding:12px;color:#667eea;cursor:pointer;background:rgba(255,255,255,.85);border-radius:8px;margin-bottom:10px}
.message{max-width:75%;padding:10px 14px;border-radius:16px;position:relative;word-wrap:break-word;display:flex;gap:10px;align-items:flex-start}
.message.my{align-self:flex-end;background:#667eea;color:#fff;border-bottom-right-radius:4px}
.message.other{align-self:flex-start;background:#fff;color:#333;border-bottom-left-radius:4px;box-shadow:0 1px 3px rgba(0,0,0,.1)}
.message-avatar{width:36px;height:36px;border-radius:50%;object-fit:cover;flex-shrink:0}
.message-body{flex:1;min-width:0}
.message .sender{font-size:12px;font-weight:600;margin-bottom:2px;opacity:.8}
.message .time{font-size:10px;opacity:.6;display:block;text-align:right;margin-top:6px;white-space:nowrap}
.message img.chat-image{max-width:200px;max-height:200px;border-radius:8px;cursor:pointer;margin-top:8px}
.message .file{display:flex;align-items:center;gap:8px;padding:8px 12px;background:rgba(0,0,0,.05);border-radius:8px;margin-top:8px;cursor:pointer}
.message a{color:inherit;text-decoration:underline}
.message .content{white-space:pre-wrap;word-break:break-word;line-height:1.5}
.message .content b,.message .content strong{font-weight:700}
.message .content i,.message .content em{font-style:italic}
.message .content u{text-decoration:underline}
.message .content s,.message .content strike{text-decoration:line-through}
.input-area{background:#fff;padding:12px 16px;display:flex;gap:10px;align-items:flex-end;box-shadow:0 -2px 8px rgba(0,0,0,.05);flex-shrink:0}
.input-area input[type="text"]{flex:1;padding:12px 16px;border:1px solid #ddd;border-radius:24px;font-size:16px;outline:none}
/* Textarea input */
.text-input{flex:1;min-height:24px;max-height:120px;padding:10px 16px;border:1px solid #ddd;border-radius:16px;font-size:16px;outline:none;overflow-y:auto;resize:none;line-height:1.5;font-family:inherit;-webkit-appearance:none;background:#fff}
.text-input:focus{border-color:#667eea;box-shadow:0 0 0 2px rgba(102,126,234,.15)}
.attach-btn,.send-btn{height:44px;border-radius:22px;border:none;font-size:15px;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.attach-btn{width:44px;background:#f0f0f0;font-size:20px}.send-btn{min-width:44px;padding:0 18px;background:#667eea;color:#fff;font-weight:500;white-space:nowrap}
.chain-btn-inline{width:44px;height:44px;border-radius:22px;border:none;background:#f0f0f0;font-size:20px;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s}
.chain-btn-inline:hover{background:#e0e4f8}
.newline-btn{width:44px;height:44px;border-radius:22px;border:none;background:#f0f0f0;font-size:18px;cursor:pointer;display:none;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s;color:#666;font-weight:700}
.newline-btn:hover{background:#e0e4f8}
@media screen and (max-width:768px){.newline-btn{display:flex}}
.reply-box{background:#f0f2ff;padding:8px 16px;display:flex;align-items:center;gap:8px;font-size:13px;color:#555;border-left:3px solid #667eea}
.reply-box .reply-label{font-weight:600;color:#667eea;white-space:nowrap}
.reply-box .reply-content{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.reply-box .reply-cancel{background:none;border:none;font-size:16px;cursor:pointer;color:#999;padding:0 4px;width:auto;min-width:24px}
.reply-preview{background:rgba(0,0,0,.06);padding:4px 8px;border-radius:6px;margin-bottom:4px;font-size:12px;border-left:2px solid #667eea;color:#666;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.reply-preview .reply-name{font-weight:600}
.message-menu{background:#fff;border-radius:8px;box-shadow:0 4px 16px rgba(0,0,0,.15);z-index:2000;overflow:hidden;min-width:140px}
.message-menu .menu-item{padding:10px 16px;cursor:pointer;font-size:14px;transition:background .15s}
.message-menu .menu-item:hover{background:#f0f2ff}
/* 接龙 (Chain) styles */
.chain-card{background:linear-gradient(135deg,#f0f4ff 0%,#e8eeff 100%);border:1px solid #c7d2fe;border-radius:12px;padding:12px;margin-top:4px}
.chain-card .chain-header{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:700;color:#4f46e5;margin-bottom:8px}
.chain-card .chain-topic{font-size:15px;font-weight:600;color:#1e1b4b;margin-bottom:4px}
.chain-card .chain-desc{font-size:13px;color:#555;margin-bottom:8px;line-height:1.4}
.chain-card .chain-list{font-size:14px;line-height:1.8;color:#333}
.chain-card .chain-list .chain-item{padding:2px 0}
.chain-card .chain-list .chain-seq{display:inline-block;min-width:22px;height:22px;line-height:22px;text-align:center;background:#667eea;color:#fff;border-radius:50%;font-size:11px;font-weight:700;margin-right:6px;vertical-align:middle}
.chain-card .chain-list .chain-name{font-weight:600;color:#4338ca}
.chain-join-btn{display:inline-flex;align-items:center;gap:4px;margin-top:10px;padding:6px 14px;background:#667eea;color:#fff;border:none;border-radius:20px;font-size:13px;font-weight:600;cursor:pointer;transition:all .2s;box-shadow:0 2px 6px rgba(102,126,234,.3)}
.chain-join-btn:hover{background:#5567d8;transform:translateY(-1px)}
.chain-join-btn:active{transform:translateY(0)}
.chain-join-btn.joined{background:#10b981}
.message.my .chain-card{background:linear-gradient(135deg,rgba(255,255,255,.2) 0%,rgba(255,255,255,.1) 100%);border-color:rgba(255,255,255,.3)}
.message.my .chain-card .chain-header{color:rgba(255,255,255,.9)}
.message.my .chain-card .chain-topic{color:#fff}
.message.my .chain-card .chain-desc{color:rgba(255,255,255,.8)}
.message.my .chain-card .chain-list{color:rgba(255,255,255,.95)}
.message.my .chain-card .chain-list .chain-seq{background:rgba(255,255,255,.3);color:#fff}
.message.my .chain-card .chain-list .chain-name{color:rgba(255,255,255,.95)}
.message.my .chain-join-btn{background:rgba(255,255,255,.25);color:#fff}
.message.my .chain-join-btn:hover{background:rgba(255,255,255,.35)}
.chain-modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:16px}
.chain-modal-actions button{width:auto!important;margin-bottom:0!important;padding:8px 24px!important;font-size:14px}
.chain-cancel-btn{background:#fff!important;color:#333!important;border:1px solid #ddd!important;border-radius:8px}
.chain-cancel-btn:hover{background:#f5f5f5!important}
.chain-submit-btn{background:#667eea!important;color:#fff!important;border:none!important;border-radius:8px;font-weight:600}
.modal{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);display:flex;justify-content:center;align-items:center;z-index:1000}
.modal-content{background:#fff;padding:24px;border-radius:16px;width:90%;max-width:450px;max-height:80vh;overflow-y:auto}
.modal-wide{max-width:520px}
.modal-content h3{margin-bottom:20px;text-align:center}
.modal-content h4{margin:16px 0 10px;font-size:14px;color:#666}
.modal-content input[type="text"],.modal-content input[type="password"],.modal-content input[type="date"],.modal-content select{width:100%;padding:12px;margin-bottom:10px;border:1px solid #ddd;border-radius:8px;font-size:16px}
.modal-content button{width:100%;padding:12px;background:#667eea;color:#fff;border:none;border-radius:8px;font-size:14px;cursor:pointer;margin-bottom:10px}
.modal-content button.danger{background:#dc2626}.modal-content button.admin-btn{background:#10b981}
.close-btn{background:#f0f0f0!important;color:#333!important}
.danger-btn{width:100%;padding:12px;background:#dc2626;color:#fff;border:none;border-radius:8px;font-size:14px;cursor:pointer;margin-bottom:10px}
.danger-text{color:#dc2626;text-align:center;margin-bottom:16px}
.settings-section{margin-bottom:20px;padding-bottom:20px;border-bottom:1px solid #eee}
.field-label{display:block;font-size:13px;color:#555;margin-bottom:6px;font-weight:500}
.timezone-setting{margin-bottom:14px}.timezone-setting label{display:block;font-size:13px;color:#555;margin-bottom:6px}
.timezone-setting select{width:100%;padding:10px;border:1px solid #ddd;border-radius:8px;font-size:16px;background:#fff}
.tz-indicator{font-size:11px;color:rgba(255,255,255,.7);background:rgba(0,0,0,.15);padding:2px 8px;border-radius:10px;white-space:nowrap}
.add-user{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}
.user-list{max-height:200px;overflow-y:auto}
.user-item{display:flex;justify-content:space-between;align-items:center;padding:10px;background:#f9f9f9;border-radius:8px;margin-bottom:8px}
.user-item .username{font-weight:600}.user-item .nickname{font-size:12px;color:#666}
.user-item .delete-btn{background:#dc2626;color:#fff;border:none;padding:6px 12px;border-radius:6px;cursor:pointer;font-size:12px}
.avatar-upload{display:flex;flex-direction:column;align-items:center;gap:10px}
.avatar-preview{width:80px;height:80px;border-radius:50%;object-fit:cover;border:2px solid #ddd}
#avatarInput{display:none}
.color-row{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.color-row input[type="color"]{width:50px;height:40px;border:1px solid #ddd;border-radius:8px;padding:2px;cursor:pointer}
.color-hex{font-size:13px;color:#666;font-family:monospace}
.radio-group{display:flex;gap:20px;margin-bottom:12px}
.radio-group label{display:flex;align-items:center;gap:6px;font-size:14px;color:#555;cursor:pointer}
.bg-preview-area{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.bg-preview{width:80px;height:60px;object-fit:cover;border-radius:8px;border:1px solid #ddd}
.bg-filename{font-size:13px;color:#888}
.save-appear-btn{background:#667eea!important;font-size:15px!important;padding:14px!important}
.live-preview{border:1px solid #ddd;border-radius:12px;overflow:hidden}
.preview-label{background:#f9f9f9;padding:8px 12px;font-size:12px;color:#999;text-align:center;border-bottom:1px solid #eee}
.preview-messages{padding:16px;min-height:100px;display:flex;flex-direction:column;gap:10px;background-color:#f5f5f5;background-position:center;transition:background-color .3s;position:relative;overflow:hidden}
.preview-messages>*{position:relative;z-index:1}
.preview-bubble{padding:8px 14px;border-radius:14px;font-size:13px;max-width:70%}
.preview-bubble.left{align-self:flex-start;background:#fff;color:#333;box-shadow:0 1px 2px rgba(0,0,0,.1)}
.preview-bubble.right{align-self:flex-end;background:#667eea;color:#fff}
#imageModal{cursor:zoom-out}#imageModal img{max-width:90vw;max-height:90vh;border-radius:8px}
.avatar-wrapper{position:relative;display:inline-block;flex-shrink:0}
.avatar-wrapper .message-avatar{width:36px;height:36px;border-radius:50%;object-fit:cover}
.online-dot{position:absolute;bottom:0;right:0;width:10px;height:10px;border-radius:50%;background:#22c55e;border:2px solid #fff;display:none}
.online-dot.online{display:block}
.kicked-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.7);display:flex;justify-content:center;align-items:center;z-index:9999}
.kicked-overlay .kicked-card{background:#fff;padding:32px;border-radius:16px;text-align:center;max-width:360px;width:90%}
.kicked-overlay .kicked-card h3{margin-bottom:12px;color:#dc2626}
.kicked-overlay .kicked-card p{margin-bottom:20px;color:#666;font-size:14px}
.kicked-overlay .kicked-card button{padding:12px 32px;background:#667eea;color:#fff;border:none;border-radius:8px;font-size:14px;cursor:pointer}
@media(min-width:768px){.message{max-width:60%}.message img.chat-image{max-width:300px;max-height:300px}}
@media screen and (max-width:768px){.page{height:100dvh}body{height:100dvh}}