:root{color-scheme:dark;--bg: #000;--bg-alt: #0a0a0a;--bg-elev: #181818;--bg-hover: #1f1f1f;--border: #262626;--border-strong: #363636;--text: #f5f5f5;--text-dim: #a8a8a8;--text-faint: #737373;--accent: #0095f6;--accent-hover: #1877f2;--bubble-them: #262626;--bubble-me: linear-gradient(135deg, #4f5bd5 0%, #962fbf 25%, #d62976 50%, #fa7e1e 75%, #feda75 100%);--bubble-me-flat: #3797f0;--shadow: 0 6px 24px rgba(0, 0, 0, .5);--radius-md: 12px;--radius-lg: 22px;--radius-bubble: 22px;--sidebar-w: 360px;--header-h: 60px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif}*{box-sizing:border-box}html,body,#app{height:100%;margin:0;font-family:var(--font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}button{font-family:inherit}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:#ffffff14;padding:1px 6px;border-radius:4px;font-size:.9em}.upload-screen{height:100%;display:grid;place-items:center;background:radial-gradient(circle at 30% 20%,rgba(150,47,191,.12),transparent 50%),radial-gradient(circle at 70% 80%,rgba(0,149,246,.1),transparent 50%),var(--bg);padding:24px}.drop-zone{width:100%;max-width:560px;border:2px dashed var(--border-strong);border-radius:18px;background:var(--bg-elev);padding:56px 32px;text-align:center;transition:border-color .18s ease,background .18s ease,transform .18s ease}.drop-zone--hover{border-color:var(--accent);background:#131313;transform:scale(1.01)}.drop-zone--loading{pointer-events:none;opacity:.85}.drop-zone__inner h1{margin:18px 0 8px;font-size:28px;font-weight:600}.drop-zone__inner p{margin:6px 0;color:var(--text-dim)}.drop-zone__inner .hint{color:var(--text-faint);font-size:13px}.drop-zone__icon{display:inline-flex;width:88px;height:88px;align-items:center;justify-content:center;border-radius:22px;background:var(--bubble-me);color:#fff;margin-bottom:4px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:0;border-radius:8px;padding:10px 18px;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s ease}.btn--primary{background:var(--accent);color:#fff;margin-top:18px}.btn--primary:hover{background:var(--accent-hover)}.sample-hint{margin-top:14px;font-size:13px;color:var(--text-faint)}.sample-link{color:var(--accent);cursor:pointer}.sample-link:hover{text-decoration:underline}.load-progress{margin-top:24px}.load-progress__bar{width:100%;height:6px;background:var(--border);border-radius:999px;overflow:hidden}.load-progress__fill{width:0;height:100%;background:var(--bubble-me);transition:width .12s ease}.load-progress__label{margin-top:8px;font-size:12px;color:var(--text-dim)}.load-progress__list{list-style:none;margin:12px 0 0;padding:0;display:flex;flex-direction:column;gap:4px;text-align:left;font-size:12px}.load-part{display:flex;justify-content:space-between;gap:12px;padding:6px 10px;border-radius:8px;background:#ffffff0a;color:var(--text-dim)}.load-part--active{background:#0095f61f;color:var(--text)}.load-part--done{color:var(--text-faint)}.load-part__name{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}.load-part__size{flex-shrink:0;font-variant-numeric:tabular-nums}.viewer{display:grid;grid-template-columns:var(--sidebar-w) 1fr;height:100%;background:var(--bg)}.sidebar{display:flex;flex-direction:column;border-right:1px solid var(--border);background:var(--bg);min-width:0}.sidebar__header{display:flex;align-items:center;gap:12px;height:var(--header-h);padding:0 16px;border-bottom:1px solid var(--border)}.sidebar__title{margin:0;font-size:17px;font-weight:600}.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:8px;border:0;background:transparent;color:var(--text);cursor:pointer;transition:background .12s ease}.icon-btn:hover:not(:disabled){background:var(--bg-hover)}.icon-btn:disabled{opacity:.4;cursor:not-allowed}.sidebar__search{padding:10px 12px 6px}.sidebar__search input,.chat__searchbar input{width:100%;border:0;background:var(--bg-elev);color:var(--text);border-radius:8px;padding:9px 12px;font-size:14px;outline:none}.sidebar__search input:focus,.chat__searchbar input:focus{background:var(--bg-hover)}.conversation-list{flex:1;overflow-y:auto;padding:6px 4px 12px}.convo-empty{padding:32px 18px;color:var(--text-dim);text-align:center;font-size:14px}.convo-row{display:grid;grid-template-columns:56px 1fr;align-items:center;gap:12px;width:100%;background:transparent;border:0;border-radius:12px;padding:8px 12px;cursor:pointer;text-align:left;color:inherit}.convo-row:hover{background:var(--bg-hover)}.convo-row--active{background:var(--bg-elev)}.convo-row__avatar{width:56px;height:56px;border-radius:50%;background:var(--bubble-me);display:grid;place-items:center;color:#fff;font-weight:600;font-size:16px;flex-shrink:0}.convo-row__body{min-width:0}.convo-row__top{display:flex;justify-content:space-between;align-items:baseline;gap:8px}.convo-row__title{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.convo-row__time{font-size:12px;color:var(--text-faint);flex-shrink:0}.convo-row__preview{font-size:13px;color:var(--text-dim);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}.chat{position:relative;display:flex;flex-direction:column;min-width:0;background:var(--bg)}.chat__empty{margin:auto;color:var(--text-faint);font-size:15px}.chat__active{display:flex;flex-direction:column;height:100%;min-height:0}.chat__header{display:flex;align-items:center;gap:12px;height:var(--header-h);padding:0 18px;border-bottom:1px solid var(--border);flex-shrink:0}.chat-header__avatar{width:36px;height:36px;border-radius:50%;background:var(--bubble-me);display:grid;place-items:center;color:#fff;font-weight:600;font-size:13px}.chat-header__body{min-width:0}.chat-header__title{font-weight:600;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-header__subtitle{font-size:12px;color:var(--text-faint);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat__searchbar{display:flex;align-items:center;gap:8px;padding:10px 14px;border-bottom:1px solid var(--border);flex-shrink:0}.chat__searchbar input{flex:1}.chat__search-meta{font-size:12px;color:var(--text-faint);min-width:36px;text-align:right}.chat__viewport{flex:1;min-height:0;overflow-y:auto;padding:6px 18px 18px;scroll-behavior:auto;overflow-anchor:none}.chat__items{display:flex;flex-direction:column}.chat__spacer{width:100%}.date-sep{text-align:center;margin:14px 0;position:relative}.date-sep span{display:inline-block;padding:4px 12px;font-size:12px;font-weight:600;color:var(--text-faint);letter-spacing:.02em}.msg{display:flex;flex-direction:column;margin:2px 0;max-width:100%}.msg--them{align-items:flex-start}.msg--me{align-items:flex-end}.msg__sender{font-size:11px;color:var(--text-faint);margin:6px 12px 2px}.msg__bubble-wrap{display:flex;flex-direction:column;max-width:min(70%,520px);position:relative}.msg--me .msg__bubble-wrap{align-items:flex-end}.msg__bubble{padding:8px 14px;border-radius:var(--radius-bubble);word-wrap:break-word;overflow-wrap:anywhere;line-height:1.4;font-size:14.5px;max-width:100%}.msg--them .msg__bubble{background:var(--bubble-them);color:var(--text);border-top-left-radius:4px}.msg--me .msg__bubble{background:var(--bubble-me-flat);color:#fff;border-top-right-radius:4px}.msg__text{white-space:pre-wrap;word-break:break-word}.msg__text mark{background:#feda75b3;color:inherit;border-radius:2px;padding:0 2px}.msg--me .msg__text a{color:#d6ecff}.msg__time{font-size:10.5px;color:var(--text-faint);margin:2px 12px 6px}.msg__reply{font-size:12px;color:var(--text-dim);background:var(--bg-elev);padding:6px 10px;border-left:3px solid var(--accent);border-radius:8px;margin-bottom:4px;max-width:100%}.msg__shared{background:var(--bg-elev);padding:10px 12px;border-radius:12px;font-size:13px;margin-bottom:4px;max-width:100%}.msg__shared-label{font-size:11px;color:var(--text-faint);margin-bottom:4px}.msg__shared-link{display:block;word-break:break-all;font-size:13px}.msg__shared-text{margin-top:4px;color:var(--text-dim)}.msg__media{display:grid;gap:4px;border-radius:16px;overflow:hidden;margin-bottom:4px;max-width:100%}.msg__media--n1{grid-template-columns:1fr}.msg__media--n2{grid-template-columns:1fr 1fr}.msg__media--n3{grid-template-columns:1fr 1fr 1fr}.msg__media--n4{grid-template-columns:1fr 1fr}.media-tile{background:var(--bg-elev);display:grid;place-items:center;min-height:120px;cursor:zoom-in;overflow:hidden}.media-tile img,.media-tile video{width:100%;height:auto;max-height:360px;display:block;object-fit:cover}.media-tile video,.media-tile audio{cursor:default}.media-tile--audio,.media-tile--file{min-height:auto;cursor:default;padding:8px}.media-tile audio,.media-tile a{width:100%}.media-placeholder{color:var(--text-dim);font-size:13px;padding:24px;text-align:center}.media-placeholder--missing{color:var(--text-faint)}.msg__reactions{display:flex;gap:4px;margin-top:-6px;padding:0 8px}.msg__reaction{display:inline-flex;align-items:center;gap:2px;background:var(--bg-elev);border:1px solid var(--border);border-radius:999px;padding:1px 6px;font-size:11.5px}.msg__reaction small{color:var(--text-faint);font-size:10px}.lightbox{position:fixed;inset:0;background:#000000d9;display:none;align-items:center;justify-content:center;z-index:1000;padding:24px;cursor:zoom-out}.lightbox--open{display:flex}.lightbox img{max-width:95vw;max-height:95vh;border-radius:8px;box-shadow:var(--shadow)}@media (max-width: 760px){:root{--sidebar-w: 100%}.viewer{grid-template-columns:1fr}.sidebar{border-right:0;border-bottom:1px solid var(--border);max-height:40vh}}