/* Operation: Osprey / R01.HF15 — scoped conversation navigation design.
   Replaces ONLY the long reply-ancestry breadcrumb and adds a responsive navigator.
   No changes to feed, post composer, engagement, notifications or branded rails. */
.rt-v2 .osp-thread-path{display:flex;align-items:center;gap:12px;justify-content:space-between;min-width:0;margin:0 0 14px;padding:9px 11px;border:1px solid #17516d;border-radius:11px;background:linear-gradient(115deg,#071d2e,#061627 76%,#092337);box-shadow:inset 0 1px 0 #30b8ed12}
.rt-v2 .osp-thread-path-main{display:flex;align-items:center;gap:5px;min-width:0;flex:1;overflow:hidden;white-space:nowrap}
.rt-v2 .osp-thread-path-main>button,.rt-v2 .osp-thread-path-main>span{flex:none}
.rt-v2 .osp-path-link{display:inline-flex;align-items:center;gap:5px;padding:6px 7px;border:1px solid transparent;border-radius:7px;color:#80cdec;font-size:11px;white-space:nowrap;max-width:140px;overflow:hidden;text-overflow:ellipsis}
.rt-v2 .osp-path-link:hover{border-color:#1b6e92;background:#0d3851;color:#ebfbff}
.rt-v2 .osp-path-separator{color:#4c809a;display:inline-flex;align-items:center}
.rt-v2 .osp-path-hidden{display:inline-flex;align-items:center;gap:3px;padding:6px 9px;color:#67dafa;border:1px solid #1a7697;border-radius:999px;background:#072d43;font-weight:800;font-size:11px}
.rt-v2 .osp-path-hidden span{font-weight:500}
.rt-v2 .osp-path-hidden:hover{background:#124761;border-color:#2bdbff}
.rt-v2 .osp-path-current{display:inline-flex;align-items:center;gap:4px;min-width:0;max-width:180px;overflow:hidden;text-overflow:ellipsis;padding:6px 10px;font-weight:750;font-size:11px;color:#f4faff;background:#0d354b;border:1px solid #20536d;border-radius:8px}
.rt-v2 .osp-path-current svg{flex:none;color:#17cdff}
.rt-v2 .osp-thread-path-tools{display:flex;gap:5px;align-items:center;flex:none}
.rt-v2 .osp-path-browse,.rt-v2 .osp-path-toggle{display:inline-flex;align-items:center;gap:6px;padding:7px 10px;border:1px solid #1e6181;border-radius:9px;background:#07263a;color:#8de1fa;font-size:11px;font-weight:700}
.rt-v2 .osp-path-browse b{color:#fff;background:#0b4866;border-radius:12px;padding:2px 7px}
.rt-v2 .osp-path-browse:hover,.rt-v2 .osp-path-toggle:hover{border-color:#16caff;background:#10445c;color:#fff}
.rt-v2 .osp-path-toggle{padding:7px}
.rt-v2 .osp-thread-path button:focus-visible{outline:2px solid #27deff;outline-offset:2px}

.osp-nav-backdrop{position:fixed;inset:0;z-index:1700;background:#000b;display:flex;align-items:center;justify-content:center;padding:20px;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.osp-nav-dialog{--osp-line:#1d526c;--osp-text:#e5f3ff;display:flex;flex-direction:column;max-width:970px;width:min(970px,100%);height:min(760px,calc(100dvh - 42px));min-height:310px;min-width:0;color:var(--osp-text);background:linear-gradient(130deg,#071d2d,#04121f 80%);border:1px solid #1d9bc8;border-radius:17px;box-shadow:0 20px 90px #000d,0 0 24px #04baff1b;outline:0;overflow:hidden;isolation:isolate}
.osp-nav-head{display:flex;align-items:center;gap:13px;flex:none;min-height:118px;padding:19px 22px;background:linear-gradient(90deg,#031526ec 20%,#05233bea 75%,#071c2cb8),url('../img/sky-fortress.webp') right 47%/cover no-repeat;border-bottom:1px solid #1a5773}
.osp-nav-head-icon{width:47px;height:47px;border:1px solid #1a9ccb;border-radius:13px;display:grid;place-items:center;flex:none;background:#041a2bd9;color:#20cfff;box-shadow:inset 0 0 15px #10bafa0d}
.osp-nav-head-copy{flex:1;min-width:0}.osp-nav-head-copy>span{font-size:10px;letter-spacing:2px;font-weight:800;color:#24d6ff;display:block}.osp-nav-head-copy h2{font-size:25px;line-height:1.16;letter-spacing:-.5px;margin:5px 0;color:#f4fbff}.osp-nav-head-copy p{font-size:12px;color:#93bacc;margin:4px 0 0}
.osp-nav-close{width:38px;height:38px;display:grid;place-items:center;border:1px solid #2b708e;border-radius:10px;color:#b6d9ea;align-self:flex-start;flex:none;background:#071c2db0}.osp-nav-close:hover{color:#fff;border-color:#28d6ff}
.osp-nav-layout{display:grid;grid-template-columns:255px minmax(0,1fr);min-height:0;flex:1}
.osp-nav-aside{display:flex;flex-direction:column;min-height:0;border-right:1px solid #1c4058;background:#061827}
.osp-nav-aside-label{display:flex;align-items:center;gap:8px;padding:17px 15px 13px;font-size:12px;font-weight:800;color:#b9d9e9;letter-spacing:.3px;flex:none}.osp-nav-aside-label svg{color:#27cfff}.osp-nav-aside-label span{margin-left:auto;background:#0a3048;padding:3px 7px;border-radius:20px;color:#70d8f6}
.osp-nav-branch-scroll{overflow:auto;flex:1;min-height:0;scrollbar-color:#19516d transparent;scrollbar-width:thin}
.osp-nav-branches{display:flex;flex-direction:column;padding:0 9px 13px;gap:5px}
.osp-nav-branch{display:flex;align-items:center;gap:10px;padding:10px 9px;min-height:60px;text-align:left;border:1px solid transparent;border-radius:10px;color:#c6e7f5;background:transparent;min-width:0}
.osp-nav-branch:hover{background:#0a2b40;border-color:#185674}.osp-nav-branch.selected{background:#0a344d;border-color:#139fce;box-shadow:inset 3px 0 #16d2ff}
.osp-nav-branch-glyph{width:32px;height:32px;flex:none;display:grid;place-items:center;border-radius:9px;background:#061d2d;color:#42d0fa;border:1px solid #1c6888}
.osp-nav-branch-dot{font-weight:800;background:radial-gradient(circle at 35% 30%,#106487,#06324c);font-size:13px}
.osp-nav-branch-copy{display:flex;flex-direction:column;gap:3px;min-width:0;flex:1}.osp-nav-branch-copy strong{font-size:12px;color:#e2f6ff}.osp-nav-branch-copy small{font-size:10px;line-height:1.35;color:#8caabd;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.osp-nav-branch>b{font-size:11px;padding:3px 7px;border-radius:99px;color:#65dbff;background:#062b40}
.osp-nav-workspace{display:flex;flex-direction:column;min-height:0;min-width:0;background:linear-gradient(145deg,#061723,#05121d)}
.osp-nav-controls{padding:16px 18px 12px;flex:none;display:grid;grid-template-columns:minmax(0,1fr) 245px;align-items:center;gap:11px;border-bottom:1px solid #173d55}
.osp-nav-tabs{display:flex;align-items:center;gap:3px;min-width:0}
.osp-nav-tabs button{display:flex;align-items:center;gap:6px;font-size:11px;font-weight:700;color:#93b3c5;padding:9px 10px;border-radius:9px;border:1px solid transparent;white-space:nowrap}
.osp-nav-tabs button.active{color:#00d4ff;border-color:#0f83af;background:#092e45}.osp-nav-tabs button:hover{color:#ebfaff;background:#092b41}
.osp-nav-search{display:flex;align-items:center;gap:8px;min-width:0;height:38px;border-radius:999px;border:1px solid #1b4b64;background:#031421;padding:0 12px;color:#75b0c8}.osp-nav-search:focus-within{border-color:#1ed5ff;box-shadow:0 0 0 2px #08b7ed1d}
.osp-nav-search input{background:transparent;border:0;outline:0;color:#e3f8ff;width:100%;min-width:0;font-size:12px}.osp-nav-search input::placeholder{color:#718fa4}
.osp-nav-filter-row{grid-column:1/-1;display:flex;gap:11px;justify-content:flex-end}.osp-nav-filter-row label{display:flex;align-items:center;gap:8px;color:#87afc5;font-size:11px}.osp-nav-filter-row select{background:#071e2d;border:1px solid #245974;border-radius:9px;min-width:115px;max-width:240px;color:#d7f6ff;padding:7px 10px;font-size:11px;color-scheme:dark}
.osp-nav-results{display:flex;flex:1;flex-direction:column;min-height:0;overflow:auto;scrollbar-width:thin;scrollbar-color:#1d6480 transparent;padding:0 16px 14px}
.osp-nav-results-head{position:sticky;top:0;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:10px;background:#051722f7;border-bottom:1px solid #153d54;padding:12px 2px}
.osp-nav-results-head>div{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}.osp-nav-results-head strong{font-size:13px;color:#e7f8ff}.osp-nav-results-head span{font-size:11px;color:#76b1ce}.osp-nav-clear{color:#3bcdf8;font-size:11px;display:flex;align-items:center;gap:4px}
.osp-nav-results-list{padding:8px 0 0;display:flex;flex-direction:column;gap:6px}
.osp-nav-result{display:flex;align-items:center;gap:11px;text-align:left;min-height:65px;padding:9px 11px;border:1px solid #1a3f55;border-radius:10px;background:linear-gradient(100deg,#081e30,#061927);color:#beddf0;min-width:0;width:100%}
.osp-nav-result:hover{border-color:#23a9d8;background:linear-gradient(100deg,#10364f,#082438)}.osp-nav-result.is-current{border-color:#14cef8;box-shadow:inset 3px 0 #1bd4ff,0 0 12px #0cc6f412}
.osp-nav-avatar{width:37px;height:37px;border-radius:50%;object-fit:cover;border:1px solid #2688ab;flex:none;background:#051626}
.osp-nav-result-main{display:flex;min-width:0;flex:1;flex-direction:column;gap:5px}.osp-nav-result-main strong{font-size:12px;color:#f1faff;display:flex;align-items:center;gap:5px;flex-wrap:wrap}.osp-nav-result-main strong span{font-size:10px;font-weight:400;color:#8db6c8}.osp-nav-result-main strong em{font-style:normal;color:#28dbff;background:#063850;border:1px solid #155c7b;border-radius:99px;padding:2px 6px;font-size:9px}
.osp-nav-result-main small{font-size:11px;line-height:1.4;color:#9ec0d2;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;line-clamp:2;overflow:hidden;overflow-wrap:anywhere}.osp-nav-result>svg:last-child{color:#56c1e4;flex:none}.osp-nav-subline{font-size:10px;color:#33b6d9}
.osp-nav-path-label{display:flex;align-items:center;gap:7px;color:#b5d6e5;font-weight:750;font-size:11px;padding:5px}.osp-nav-path-label span{margin-left:auto;color:#83b4cb;font-size:10px;font-weight:400}
.osp-nav-path-item{min-height:58px}.osp-nav-path-marker{display:grid;place-items:center;width:31px;height:31px;flex:none;border-radius:100px;border:1px solid #1d7392;background:#07334b;color:#67dbfd;font-size:12px;font-weight:800}
.osp-nav-more{display:flex;align-items:center;justify-content:center;gap:8px;padding:13px;border:1px dashed #158ab4;border-radius:10px;color:#3bd9ff;font-size:12px;margin:4px 0 10px}.osp-nav-more:hover{background:#0a3248}
.osp-nav-empty{display:flex;align-items:center;flex-direction:column;text-align:center;padding:55px 12px;color:#82b0c8;gap:11px}.osp-nav-empty>svg{color:#22cfff}.osp-nav-empty b{color:#e6f6fd}.osp-nav-empty p{max-width:310px;font-size:12px;margin:0;line-height:1.5}.osp-nav-empty button{color:#28cfff;border:1px solid #2687ad;border-radius:8px;padding:8px 15px;margin-top:5px}
.osp-nav-footer{min-height:57px;flex:none;display:flex;align-items:center;justify-content:space-between;gap:9px;padding:10px 20px;border-top:1px solid #17445d;background:#051827}.osp-nav-footer span{display:flex;align-items:center;gap:7px;font-size:10px;color:#91bad0}.osp-nav-footer svg{color:#25cef5}.osp-nav-footer button{border:1px solid #2d708f;border-radius:9px;padding:8px 13px;color:#d5ecf8;background:#09273a;font-size:11px}
.osp-nav-dialog button:focus-visible,.osp-nav-dialog select:focus-visible{outline:2px solid #27d4fc;outline-offset:2px}
.osp-nav-grip{display:none}
body.thread-navigator-open{overflow:hidden}
@media(max-width:900px){.osp-nav-dialog{width:min(880px,100%)}.osp-nav-layout{grid-template-columns:210px minmax(0,1fr)}.osp-nav-controls{grid-template-columns:1fr}.osp-nav-search{width:100%}.osp-nav-filter-row{justify-content:space-between}.osp-nav-head{min-height:94px}.osp-nav-head-copy h2{font-size:22px}}
@media(max-width:590px){
 .rt-v2 .osp-thread-path{padding:7px;gap:6px;margin:0 0 11px}.rt-v2 .osp-path-link{font-size:10px;padding:6px 4px;max-width:103px}.rt-v2 .osp-path-hidden{font-size:10px;padding:5px 7px}.rt-v2 .osp-path-hidden span{display:none}.rt-v2 .osp-path-separator svg{width:10px}.rt-v2 .osp-path-current{font-size:10px;padding:6px 7px;max-width:100px}.rt-v2 .osp-path-browse{padding:7px}.rt-v2 .osp-path-browse span{display:none}.rt-v2 .osp-path-browse b{font-size:10px}.rt-v2 .osp-path-toggle{padding:7px 5px}
 .osp-nav-backdrop{align-items:flex-end;padding:0;background:#0009}.osp-nav-dialog{height:min(90dvh,900px);width:100%;min-height:300px;max-width:none;border-radius:19px 19px 0 0;border-bottom:0;box-shadow:0 -12px 55px #000b}
 .osp-nav-grip{display:block;position:absolute;top:8px;left:calc(50% - 21px);width:42px;height:4px;border-radius:99px;background:#3085a6;z-index:4}
 .osp-nav-head{min-height:97px;padding:22px 13px 10px;gap:9px}.osp-nav-head-icon{width:36px;height:36px;border-radius:10px}.osp-nav-head-icon svg{width:20px}.osp-nav-head-copy>span{font-size:8px;letter-spacing:1.2px}.osp-nav-head-copy h2{font-size:20px}.osp-nav-head-copy p{font-size:10px}.osp-nav-close{width:32px;height:32px}
 .osp-nav-layout{display:flex;flex-direction:column;min-height:0}.osp-nav-aside{border-right:0;border-bottom:1px solid #1c4058;flex:none;min-height:0;padding:7px 0}
 .osp-nav-aside-label{font-size:10px;padding:3px 13px 6px}.osp-nav-branch-scroll{max-height:85px;overflow-x:auto;overflow-y:hidden;scrollbar-width:none}
 .osp-nav-branches{flex-direction:row;padding:0 9px;gap:7px;min-width:max-content}.osp-nav-branch{min-height:57px;max-width:156px;min-width:120px;padding:7px}.osp-nav-branch-glyph{width:25px;height:25px;font-size:11px}.osp-nav-branch-copy{min-width:0}.osp-nav-branch-copy strong{font-size:11px}.osp-nav-branch-copy small{font-size:9px}.osp-nav-branch>b{font-size:9px;padding:2px 5px}
 .osp-nav-controls{padding:8px 10px;gap:7px}.osp-nav-tabs{justify-content:space-between}.osp-nav-tabs button{font-size:10px;padding:7px 5px;gap:4px}.osp-nav-tabs button svg{width:13px}.osp-nav-search{height:37px}.osp-nav-filter-row{gap:5px}.osp-nav-filter-row label{gap:5px;font-size:10px}.osp-nav-filter-row select{min-width:84px;max-width:130px;font-size:10px;padding:6px}
 .osp-nav-results{padding:0 9px 10px}.osp-nav-results-head{padding:9px 2px}.osp-nav-result{padding:9px 8px;min-height:59px;gap:9px}.osp-nav-avatar{width:32px;height:32px}.osp-nav-result-main strong{font-size:11px}.osp-nav-result-main small{font-size:10px}.osp-nav-footer{min-height:49px;padding:7px 10px 11px}.osp-nav-footer span{font-size:9px}.osp-nav-footer button{padding:7px 10px}
}
@media(max-width:375px){.rt-v2 .osp-path-current{max-width:78px}.rt-v2 .osp-path-browse{gap:3px}.rt-v2 .osp-path-link{max-width:90px}.osp-nav-head-copy h2{font-size:18px}.osp-nav-filter-row select{max-width:116px}}
@media(prefers-reduced-motion:reduce){.osp-nav-dialog,.osp-nav-backdrop{transition:none}}

/* Bounded branch list — HF16 can replace this with virtualized rows without a layout change. */
.osp-nav-showbranches{display:flex;align-items:center;justify-content:center;gap:6px;padding:11px 8px;margin-top:5px;border:1px dashed #1b7b9b;border-radius:9px;color:#49cdf1;font-size:11px;background:#071e30;white-space:nowrap}
.osp-nav-showbranches:hover{border-color:#1bd4f9;color:#fff;background:#093449}