:root{--bg:#f5f7fb;--card:#fff;--text:#172033;--muted:#6d7586;--line:#e7eaf0;--primary:#4f46e5;--danger:#c62828}
*{box-sizing:border-box}body{margin:0;font-family:Tahoma,Arial,sans-serif;background:var(--bg);color:var(--text)}a{color:var(--primary);text-decoration:none}
button,input,textarea,select{font:inherit}input,textarea,select{width:100%;padding:12px 13px;border:1px solid var(--line);border-radius:12px;background:#fff;outline:none;margin:6px 0 12px}input:focus,textarea:focus,select:focus{border-color:var(--primary)}
label{font-size:14px;font-weight:700}.btn{border:1px solid var(--line);background:#fff;padding:10px 15px;border-radius:12px;cursor:pointer}.btn.primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn:disabled{opacity:.6}.small-btn{padding:7px 10px}.muted,.small{color:var(--muted);font-size:13px}
.center-page{min-height:100vh;display:grid;place-items:center;padding:20px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 8px 30px rgba(25,34,60,.05)}.auth-card{width:min(430px,100%)}.alert{padding:12px;border-radius:12px;margin:12px 0}.alert.success{background:#e9f8ef;color:#176638}.alert.danger{background:#ffebee;color:#a01616}
.app{display:grid;grid-template-columns:280px 1fr;min-height:100vh;direction:ltr}.sidebar,.main{direction:rtl}.sidebar{background:#111827;color:#fff;padding:18px;position:sticky;top:0;height:100vh}.brand,.userbox{display:flex;align-items:center;gap:12px}.brand{padding-bottom:20px;border-bottom:1px solid #263245}.brand small,.userbox small{display:block;color:#9ca3af;margin-top:4px}.logo,.avatar{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:#4f46e5;color:#fff;font-weight:800}.userbox{margin:18px 0;padding:12px;background:#182234;border-radius:14px}.nav-title{font-size:12px;color:#9ca3af;margin:18px 8px 8px}.room{display:block;color:#dbe3ef;padding:11px 12px;border-radius:10px;margin:3px 0}.room:hover,.room.active{background:#263245;color:#fff}.admin-link{margin-top:15px;border-top:1px solid #263245}
.main{height:100vh;display:grid;grid-template-rows:auto auto 1fr auto auto;min-width:0}.topbar{display:flex;align-items:center;justify-content:space-between;padding:16px 22px;background:#fff;border-bottom:1px solid var(--line)}.topbar h2{margin:0 0 3px}.topbar p{margin:0}.mobile-menu{display:none}
.announcements{padding:10px 18px 0;display:flex;gap:10px;overflow:auto}.announcement{white-space:nowrap;background:#fff7d6;border:1px solid #ffe08b;padding:10px 14px;border-radius:12px;font-size:13px}.announcement span{margin-right:8px;color:#675500}
.messages{overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:12px}.message{align-self:flex-start;max-width:min(720px,82%);background:#fff;border:1px solid var(--line);border-radius:18px 18px 18px 5px;padding:11px 13px;box-shadow:0 3px 12px rgba(20,30,55,.04)}.message.mine{align-self:flex-end;background:#eef0ff;border-radius:18px 18px 5px 18px}.message-meta{display:flex;gap:8px;align-items:center;font-size:12px}.message-meta span{color:var(--muted)}.message-body{line-height:1.85;margin-top:7px;word-break:break-word}.message-footer{display:flex;gap:10px;justify-content:flex-end;align-items:center;margin-top:7px;color:var(--muted);font-size:11px}.msg-action{border:0;background:none;color:#666;font-size:11px;cursor:pointer}.danger-text{color:var(--danger)}.chat-img,.chat-video{max-width:100%;max-height:420px;border-radius:13px;margin-top:9px;display:block}
.composer{display:flex;gap:10px;align-items:flex-end;padding:12px 18px;background:#fff;border-top:1px solid var(--line)}.composer textarea{resize:none;margin:0;max-height:130px}.composer .btn{height:45px}.attach{width:45px;height:45px;display:grid;place-items:center;border:1px solid var(--line);border-radius:12px;cursor:pointer;font-size:26px;font-weight:400}.file-hint{background:#fff;padding:0 20px 10px;color:var(--muted);font-size:12px}
.admin-wrap{max-width:1200px;margin:auto;padding:30px 18px}.admin-head{display:flex;justify-content:space-between;align-items:center}.admin-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:18px 0}.table-card{margin:18px 0}.table-scroll{overflow:auto}table{width:100%;border-collapse:collapse}th,td{padding:11px;border-bottom:1px solid var(--line);text-align:right;white-space:nowrap}.inline{display:inline}.inline select{margin:0;min-width:130px;padding:7px}.report{border-bottom:1px solid var(--line);padding:13px 0}.report span,.report small{display:block;color:var(--muted);font-size:12px}.report p{margin:8px 0}
@media(max-width:800px){.app{grid-template-columns:1fr}.sidebar{position:fixed;z-index:20;right:-290px;width:280px;transition:.2s}.sidebar.open{right:0}.mobile-menu{display:block;border:0;background:#eef0ff;border-radius:10px;padding:9px 12px}.message{max-width:92%}.admin-grid{grid-template-columns:1fr}.announcements{padding-right:10px}.composer{padding:10px}.topbar{padding:12px 14px}}