:root{--bg:#f4f6fb;--card:#fff;--text:#172033;--muted:#7c879e;--line:#e7eaf1;--brand:#111827;--accent:#2563eb;--mine:#e8f1ff;--danger:#dc2626;--shadow:0 18px 50px rgba(18,31,53,.12)}
*{box-sizing:border-box}html,body{height:100%;margin:0}body{font-family:system-ui,-apple-system,"Segoe UI",Tahoma,sans-serif;background:var(--bg);color:var(--text);overflow:hidden}.chat-shell{height:100%;display:flex;flex-direction:column}.chat-header{height:72px;padding:10px 18px;background:rgba(255,255,255,.9);backdrop-filter:blur(18px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;z-index:20}.chat-brand{display:flex;gap:10px;align-items:center}.chat-brand img{width:42px;height:42px;border-radius:14px;object-fit:cover}.chat-brand div{display:flex;flex-direction:column}.chat-brand strong{font-size:16px}.chat-brand small{color:var(--muted)}.icon-btn{width:42px;height:42px;border:1px solid var(--line);background:var(--card);border-radius:14px;display:grid;place-items:center;color:var(--text);text-decoration:none;cursor:pointer}.chat-layout{height:calc(100% - 72px);display:grid;grid-template-columns:300px 1fr;direction:ltr}.chat-sidebar,.conversation{direction:rtl}.chat-sidebar{background:var(--card);border-right:1px solid var(--line);padding:16px;overflow:auto}.me-card{display:grid;grid-template-columns:48px 1fr auto;gap:10px;align-items:center;padding:12px;border-radius:18px;background:linear-gradient(135deg,#f7f9ff,#eef3ff);margin-bottom:18px}.avatar{width:46px;height:46px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#111827,#334155);color:#fff;font-weight:800;overflow:hidden}.avatar img{width:100%;height:100%;object-fit:cover}.me-card div:nth-child(2){display:flex;flex-direction:column;min-width:0}.me-card b{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.me-card span{font-size:12px;color:var(--muted)}.status-dot{width:9px!important;height:9px;border-radius:50%;background:#22c55e!important}.room-title,.users-head{display:flex;justify-content:space-between;align-items:center;font-size:12px;font-weight:800;color:var(--muted);margin:12px 5px 7px}.users-head button{border:0;background:none;color:var(--muted);cursor:pointer}.room{width:100%;display:grid;grid-template-columns:32px 1fr auto;align-items:center;text-align:right;border:0;background:transparent;padding:11px;border-radius:14px;color:var(--text);cursor:pointer;margin-bottom:5px}.room i{color:var(--muted)}.room.active{background:#eef4ff;color:#174ea6;font-weight:800}.room.active i{color:#2563eb}.room b{min-width:20px;padding:2px 6px;border-radius:20px;background:#ef4444;color:#fff;font-size:11px}.user-search{height:40px;border:1px solid var(--line);border-radius:13px;display:flex;align-items:center;gap:8px;padding:0 11px}.user-search i{color:var(--muted);font-size:13px}.user-search input{border:0;outline:0;width:100%;background:none;color:var(--text)}.users-list{margin-top:8px;display:flex;flex-direction:column;gap:3px}.user-row{display:grid;grid-template-columns:38px 1fr auto;gap:9px;align-items:center;padding:8px;border-radius:13px;cursor:pointer}.user-row:hover,.user-row.active{background:#f2f5fb}.user-row .avatar{width:38px;height:38px;font-size:13px}.user-row div:nth-child(2){min-width:0;display:flex;flex-direction:column}.user-row b,.user-row small{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-row small{color:var(--muted)}.rank{font-size:10px;padding:4px 7px;border-radius:20px;background:#f0f2f6;color:#64748b;text-transform:capitalize}.rank.owner,.rank.admin{background:#fff1d6;color:#a16207}.rank.moderator{background:#e8f7ef;color:#16814c}.rank.vip{background:#f3e8ff;color:#7e22ce}.conversation{position:relative;display:flex;flex-direction:column;min-width:0;background:radial-gradient(circle at 20% 10%,rgba(37,99,235,.05),transparent 30%),var(--bg)}.conversation-head{height:70px;padding:10px 18px;background:rgba(255,255,255,.85);backdrop-filter:blur(15px);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px}.conversation-head>div{flex:1}.conversation-head h1{font-size:17px;margin:0}.conversation-head p{font-size:12px;color:var(--muted);margin:2px 0 0}.mobile-sidebar-btn{display:none}.messages{flex:1;overflow-y:auto;padding:20px max(18px,calc((100% - 900px)/2));display:flex;flex-direction:column;gap:12px;scroll-behavior:smooth}.loading{margin:auto;color:var(--muted)}.message{display:flex;gap:9px;align-items:flex-end;max-width:76%;position:relative}.message.mine{align-self:flex-end;flex-direction:row-reverse}.message .avatar{width:34px;height:34px;flex:0 0 34px;font-size:11px}.bubble-wrap{min-width:0}.message-meta{display:flex;align-items:center;gap:6px;margin:0 8px 4px;font-size:11px;color:var(--muted)}.message.mine .message-meta{justify-content:flex-start}.message-meta b{color:var(--text);font-size:12px}.bubble{background:var(--card);border:1px solid var(--line);border-radius:18px 18px 18px 5px;padding:10px 12px;box-shadow:0 4px 20px rgba(27,39,64,.04);overflow:hidden}.mine .bubble{background:var(--mine);border-color:#d5e4ff;border-radius:18px 18px 5px 18px}.bubble p{margin:0;white-space:pre-wrap;word-break:break-word;line-height:1.55}.bubble img{display:block;max-width:min(360px,100%);max-height:360px;border-radius:13px;margin-top:8px;cursor:zoom-in;object-fit:cover}.reply-quote{border-right:3px solid var(--accent);padding:6px 9px;margin-bottom:7px;border-radius:8px;background:rgba(37,99,235,.07);font-size:12px;color:var(--muted);max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.message-actions{position:absolute;top:-10px;left:10px;display:none;background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:10px;overflow:hidden;z-index:3}.message:hover .message-actions{display:flex}.message-actions button{border:0;background:none;padding:7px 9px;cursor:pointer;color:var(--muted)}.message-actions button:hover{background:#f4f6fa;color:var(--text)}.deleted{font-style:italic;color:var(--muted)}.composer{min-height:76px;padding:12px max(18px,calc((100% - 900px)/2));background:rgba(255,255,255,.9);backdrop-filter:blur(16px);border-top:1px solid var(--line);display:flex;gap:9px;align-items:flex-end}.composer textarea{flex:1;min-height:48px;max-height:140px;resize:none;border:1px solid var(--line);border-radius:17px;padding:13px 15px;outline:none;background:var(--card);color:var(--text);font:inherit}.composer textarea:focus{border-color:#a9c5ff;box-shadow:0 0 0 3px rgba(37,99,235,.08)}.attach-btn,.send-btn{width:48px;height:48px;border-radius:15px;display:grid;place-items:center;cursor:pointer;flex:0 0 48px}.attach-btn{background:var(--card);border:1px solid var(--line);color:var(--muted)}.send-btn{border:0;background:var(--brand);color:#fff}.send-btn:disabled{opacity:.5}.reply-bar,.image-preview{margin:0 max(18px,calc((100% - 900px)/2));background:var(--card);border:1px solid var(--line);border-bottom:0;padding:8px 12px;display:flex;justify-content:space-between;align-items:center}.reply-bar div{display:flex;flex-direction:column;min-width:0}.reply-bar span{font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.reply-bar button,.image-preview button{border:0;background:none;font-size:22px;cursor:pointer}.image-preview img{height:70px;border-radius:10px}.notice{margin:12px auto 0;padding:10px 15px;border-radius:12px;background:#fff7d6;color:#855b00;border:1px solid #f7d87b;max-width:90%}.new-messages{position:absolute;bottom:92px;left:50%;transform:translateX(-50%);border:0;border-radius:30px;background:var(--brand);color:#fff;padding:9px 14px;box-shadow:var(--shadow);cursor:pointer;z-index:5}.modal{position:fixed;inset:0;background:rgba(12,20,35,.55);backdrop-filter:blur(7px);display:grid;place-items:center;padding:18px;z-index:100}.modal[hidden]{display:none}.modal-card{width:min(470px,100%);max-height:92vh;overflow:auto;background:var(--card);border-radius:24px;padding:20px;box-shadow:var(--shadow)}.modal-card header{display:flex;justify-content:space-between;gap:12px}.modal-card h2{margin:0}.modal-card header p{margin:4px 0;color:var(--muted);font-size:12px}.modal-close,.image-modal-close{border:0;background:#f1f3f7;border-radius:50%;width:35px;height:35px;font-size:20px;cursor:pointer}.profile-avatar-edit{display:flex;justify-content:center;margin:15px}.avatar.large{width:86px;height:86px;font-size:26px}.profile-avatar-edit label{position:absolute;margin:56px 60px 0 0;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:#fff;cursor:pointer}.modal-card>label{display:flex;flex-direction:column;gap:6px;margin:12px 0;font-size:13px;font-weight:700}.modal-card input,.modal-card textarea{border:1px solid var(--line);border-radius:13px;padding:11px 12px;background:var(--card);color:var(--text);outline:0;font:inherit}.modal-card textarea{min-height:85px;resize:vertical}.form-help,.form-status{font-size:12px;color:var(--muted)}.form-status.error{color:var(--danger)}.form-status.success{color:#15803d}.save-btn{width:100%;border:0;border-radius:14px;background:var(--brand);color:#fff;padding:13px;cursor:pointer;font-weight:800}.image-modal-close{position:absolute;top:20px;right:20px}.modal#imageModal img{max-width:95vw;max-height:90vh;border-radius:16px}.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:200;background:#111827;color:#fff;padding:11px 16px;border-radius:12px;box-shadow:var(--shadow)}
@media(prefers-color-scheme:dark){:root{--bg:#0c111b;--card:#141b27;--text:#edf2ff;--muted:#929db2;--line:#263043;--brand:#e9efff;--mine:#172b4d}.send-btn{color:#111827}.chat-header,.conversation-head,.composer{background:rgba(20,27,39,.88)}.me-card{background:linear-gradient(135deg,#17202f,#18243a)}.room.active{background:#16294a;color:#bcd2ff}.user-row:hover,.user-row.active{background:#1c2635}.modal-close{background:#222c3c;color:var(--text)}}
@media(max-width:760px){.chat-layout{grid-template-columns:1fr}.chat-sidebar{position:fixed;top:72px;bottom:0;right:0;width:min(86vw,320px);z-index:30;transform:translateX(110%);transition:.25s;box-shadow:-20px 0 50px rgba(0,0,0,.2)}.chat-sidebar.open{transform:none}.mobile-sidebar-btn{display:grid;place-items:center;width:40px;height:40px;border:1px solid var(--line);background:var(--card);border-radius:13px;color:var(--text)}.messages{padding:15px 10px}.message{max-width:90%}.composer{padding:10px}.reply-bar,.image-preview{margin:0 10px}.chat-brand small{display:none}.chat-header{height:64px}.chat-layout{height:calc(100% - 64px)}.chat-sidebar{top:64px}.message-actions{display:flex;opacity:.35}.message:hover .message-actions{opacity:1}}

.typing-indicator{margin:6px max(18px,calc((100% - 900px)/2));font-size:12px;color:var(--muted);min-height:18px}.message-actions button[data-action=delete]{color:#dc2626}.message-meta .rank{font-size:9px}

/* Techno B Chat v2.1 — clearer public/private rooms and notifications */
.header-actions{display:flex;align-items:center;gap:8px}.notification-btn{position:relative}.notification-btn b{position:absolute;top:-4px;left:-4px;min-width:19px;height:19px;padding:0 5px;border-radius:20px;background:#ef4444;color:#fff;font-size:10px;display:grid;place-items:center;border:2px solid var(--card)}
.room-card{grid-template-columns:38px 1fr auto!important;min-height:62px;text-align:inherit!important;border:1px solid transparent!important}.room-card>i{width:36px;height:36px;border-radius:12px;display:grid;place-items:center;background:var(--bg)}.room-card>span{display:flex;flex-direction:column;gap:3px;min-width:0}.room-card strong{font-size:13px}.room-card small{font-size:10px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.room-card.active{border-color:#cfe0ff!important;box-shadow:0 5px 18px rgba(37,99,235,.08)}
.conversation-title-wrap{display:flex!important;align-items:center;gap:14px;min-width:0}.mode-switch{display:flex;gap:5px;padding:4px;background:var(--bg);border:1px solid var(--line);border-radius:14px}.mode-tab{position:relative;border:0;background:transparent;color:var(--muted);padding:8px 10px;border-radius:10px;display:flex;align-items:center;gap:6px;cursor:pointer;font-weight:800;font-size:12px;white-space:nowrap}.mode-tab.active{background:var(--card);color:var(--accent);box-shadow:0 3px 12px rgba(0,0,0,.08)}.mode-tab b{position:absolute;top:-6px;left:-5px;min-width:17px;height:17px;padding:0 4px;border-radius:20px;background:#ef4444;color:#fff;font-size:9px;display:grid;place-items:center}
.notifications-card{width:min(520px,100%)}.notifications-tools{display:flex;justify-content:flex-end;margin:8px 0 12px}.notifications-tools button{border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:11px;padding:8px 11px;cursor:pointer}.notifications-list{display:flex;flex-direction:column;gap:8px;max-height:62vh;overflow:auto}.notification-item{display:grid;grid-template-columns:42px 1fr auto;gap:10px;align-items:center;padding:11px;border:1px solid var(--line);border-radius:15px;background:var(--card);cursor:pointer}.notification-item.unread{border-color:#9fc0ff;background:rgba(37,99,235,.06)}.notification-item .notification-icon{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;background:var(--bg);color:var(--accent)}.notification-item .notification-body{min-width:0}.notification-item b,.notification-item p{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.notification-item p{margin:3px 0 0;color:var(--muted);font-size:12px}.notification-item time{font-size:10px;color:var(--muted);white-space:nowrap}.notifications-empty{text-align:center;color:var(--muted);padding:35px 10px}.private-empty{margin:auto;text-align:center;max-width:360px;padding:28px;color:var(--muted)}.private-empty i{font-size:42px;color:var(--accent);margin-bottom:12px}.private-empty b{display:block;color:var(--text);font-size:16px;margin-bottom:6px}
@media(max-width:760px){.conversation-head{height:auto;min-height:82px;padding:8px 10px}.conversation-title-wrap{flex:1;flex-direction:column;align-items:stretch;gap:6px}.conversation-title-wrap>div:last-child{padding-inline:4px}.mode-switch{width:100%}.mode-tab{flex:1;justify-content:center}.conversation-head h1{font-size:14px}.conversation-head p{font-size:10px}.chat-brand strong{font-size:14px}.header-actions{gap:4px}}