:root{color-scheme:light;--app-bg:#d8e4ec;--panel-bg:#ffffff;--panel-line:#e4ebf2;--text:#1f2d3d;--muted:#73869a;--accent:#3390ec;--accent-strong:#2b7dd0;--bubble-in:#ffffff;--bubble-out:#d8f1ff}*{box-sizing:border-box}body,html{margin:0;padding:0;min-height:100%;font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:linear-gradient(180deg,#c7d7e3,#d8e4ec);color:var(--text)}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.layout-shell{min-height:100vh;display:grid;grid-template-columns:64px 1fr;max-width:1320px;margin:0 auto;border-left:1px solid rgba(31,45,61,.08);border-right:1px solid rgba(31,45,61,.08);background:#ebf1f6}.sidebar{background:var(--panel-bg);border-right:1px solid var(--panel-line);padding:10px;position:relative}.sidebar h2{margin:0;font-size:1.1rem}.menu-drawer>summary{list-style:none;width:42px;height:42px;border-radius:12px;border:1px solid var(--panel-line);background:#f5f9fc;display:flex;flex-direction:column;justify-content:center;gap:4px;padding:0 10px;cursor:pointer}.menu-drawer>summary::-webkit-details-marker{display:none}.hamburger-line{display:block;width:100%;height:2px;border-radius:2px;background:#35587a}.menu-panel{position:fixed;left:0;top:0;width:min(320px,88vw);height:100vh;overflow-y:auto;background:#fff;border-right:1px solid var(--panel-line);box-shadow:8px 0 24px rgba(27,50,74,.16);padding:14px 12px 12px;display:flex;flex-direction:column;gap:10px;z-index:60;transform:translateX(-105%);transition:transform .18s ease}.menu-drawer[open] .menu-panel{transform:translateX(0)}.menu-drawer[open]>summary{background:#d9ecff;border-color:#c8e1f9}.conversation-list{display:flex;flex-direction:column;gap:4px;overflow-y:auto;min-height:130px}.create-chat-form{border:1px solid var(--panel-line);border-radius:14px;padding:10px;display:flex;flex-direction:column;gap:8px;background:#f8fbfe}.create-chat-form input,.create-chat-form select{border:1px solid #d8e2ed;border-radius:10px;padding:9px 11px;background:#fff}.participant-list{max-height:115px;overflow-y:auto;border:1px solid #dfe7f1;border-radius:10px;padding:6px;background:#fff;display:flex;flex-direction:column;gap:6px}.participant-item{display:flex;align-items:center;gap:8px;font-size:.9rem}.conversation-item{border-radius:12px;padding:10px;display:block;background:transparent;border:1px solid transparent}.conversation-item:hover{background:#f1f6fb}.conversation-item.active{background:#d9ecff;border-color:#c8e1f9}.chat-main{display:flex;flex-direction:column;min-width:0;background:linear-gradient(180deg,#f5f9fc,#eef4f8);justify-content:flex-start;align-items:stretch}.chat-header{border-bottom:1px solid var(--panel-line);background:rgba(255,255,255,.92);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);padding:12px 16px}.chat-header-title{font-size:1rem;font-weight:700}.chat-header-subtitle{margin-top:4px;font-size:.8rem;color:var(--muted)}.message-list{flex:1 1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:8px;background-image:radial-gradient(circle at 15px 15px,rgba(31,45,61,.03) 2px,transparent 0);background-size:26px 26px}.inbox-list{background:transparent;background-image:none;align-items:stretch;justify-content:flex-start}.inbox-main .message-list{flex:0 1 auto;min-height:0;align-content:flex-start}.inbox-search-wrap{padding:10px 14px 0;background:rgba(255,255,255,.92)}.inbox-search-input{width:100%;border:1px solid #d4e2ee;border-radius:999px;padding:10px 14px;background:#fff}.message{padding:8px 10px;background:var(--bubble-in);border:1px solid #e4edf5;border-radius:14px;max-width:min(78%,620px);box-shadow:0 1px 0 rgba(31,45,61,.04)}.message.own{margin-left:auto;background:var(--bubble-out);border-color:#bfe8ff}.message-meta{margin-top:4px;font-size:.72rem;color:var(--muted)}.inbox-item{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid #e4ebf2;border-radius:12px;padding:12px}.inbox-item:hover{border-color:#cfe0ee;background:#fcfeff}.inbox-item-title{font-size:.98rem;font-weight:700}.inbox-item-content{min-width:0}.inbox-item-preview{margin-top:4px;color:var(--muted);font-size:.84rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-avatar{background:linear-gradient(180deg,#f0f3f7,#e4e9ef);position:relative;overflow:hidden}.chat-avatar,.chat-avatar-img{width:42px;height:42px;border-radius:50%;flex:0 0 auto;border:1px solid #d9e1ea}.chat-avatar-img{object-fit:cover}.chat-avatar:before{width:13px;height:13px;border-radius:50%;top:8px}.chat-avatar:after,.chat-avatar:before{content:"";position:absolute;background:#c3ccd8;left:50%;transform:translateX(-50%)}.chat-avatar:after{width:28px;height:16px;border-radius:14px 14px 8px 8px;bottom:5px}.chat-avatar.group:before{width:10px;height:10px;left:40%;top:10px;box-shadow:10px 0 0 #c3ccd8}.chat-avatar.group:after{width:30px;height:14px;border-radius:10px}.chat-composer{border-top:1px solid var(--panel-line);background:#ffffff;padding:10px 12px;display:flex;gap:8px;align-items:center}.chat-composer input{flex:1 1;border:1px solid #dbe6f0;border-radius:999px;padding:10px 14px;background:#fdfefe}.btn{border:0;border-radius:10px;background:var(--accent);color:#fff;padding:10px 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10px}.menu-panel{width:min(360px,90vw)}.chat-main{justify-content:flex-start}.chat-header{position:-webkit-sticky;position:sticky;top:0;z-index:10}.auth-card{border-radius:18px;padding:22px}.phone-chat,.phone-group,.phone-home,.phone-inbox{opacity:.2;transform:none}.phone-home{left:-20px;top:60px}.phone-inbox{left:30px;bottom:40px}.phone-chat{right:-24px;top:90px}.phone-group{right:20px;bottom:20px}}:root{--surface:#ffffff;--surface-2:#f5f8fc;--surface-3:#eef3f8;--line:#d7e2ee;--bubble-left:#ffffff;--bubble-right:#dff2ff;--text-strong:#11253b;--text-soft:#688097;--primary:#3b9cff;--primary-strong:#2f84da}@media (prefers-color-scheme:dark){:root{--surface:#16212c;--surface-2:#1c2a37;--surface-3:#202f3d;--line:#304455;--bubble-left:#233342;--bubble-right:#21435f;--text-strong:#e8f1f9;--text-soft:#9eb1c3;--primary:#4ba2ff;--primary-strong:#3b87d9}}.layout-shell{grid-template-columns:320px 1fr;background:var(--surface-3)}.sidebar{background:var(--surface);border-right:1px solid 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var(--line);position:relative}.chat-composer input{background:var(--surface-2);border-color:var(--line);color:var(--text-strong)}.icon-btn{width:36px;height:36px;border:1px solid var(--line);border-radius:50%;background:var(--surface-2);color:var(--text-soft);display:inline-grid;place-items:center;cursor:pointer;transition:transform .12s ease,background-color .12s ease}.icon-btn:hover{transform:translateY(-1px);background:color-mix(in srgb,var(--primary) 13%,var(--surface-2))}.emoji-popover{position:absolute;left:12px;bottom:58px;background:var(--surface);border:1px solid var(--line);border-radius:12px;box-shadow:0 10px 24px rgba(0,0,0,.14);padding:8px;display:grid;grid-template-columns:repeat(4,1fr);grid-gap:6px;gap:6px;z-index:12}.emoji-btn{border:1px solid transparent;background:transparent;border-radius:8px;cursor:pointer;padding:6px 4px}.emoji-btn:hover{border-color:var(--line);background:var(--surface-2)}.btn{background:var(--primary)}.btn:hover{background:var(--primary-strong)}.inbox-search-wrap{background:color-mix(in srgb,var(--surface) 88%,transparent)}.inbox-search-input{color:var(--text-strong)}.inbox-item,.inbox-search-input{background:var(--surface);border-color:var(--line)}.inbox-item{transition:transform .15s ease,border-color .15s ease,background-color .15s ease}.inbox-item:hover{transform:translateY(-1px);border-color:color-mix(in srgb,var(--primary) 34%,var(--line))}.inbox-item-title{color:var(--text-strong)}.inbox-item-preview,.inbox-item-time{color:var(--text-soft)}.inbox-item-row{display:flex;align-items:center;justify-content:space-between;gap:8px}.inbox-item-time{font-size:.72rem;white-space:nowrap}@media (max-width:980px){.layout-shell{grid-template-columns:1fr}.sidebar{position:-webkit-sticky;position:sticky;top:0;z-index:30}.rail-list{max-height:34vh;border-top:1px solid var(--line)}}