.interchange{--paper:#eef0ec;--paper-raise:#e5e8e1;--paper-sunk:#e2e5de;--ink:#14181a;--ink-soft:#4b5550;--ink-faint:#7c857f;--line:#c7cdc5;--line-strong:#a8b0a4;--hub:#2e3ae0;--hub-ink:#f5f4ef;--chat:#0f9e86;--pro:#c97a1f;--market:#d5522f;--ent:#7c5cfc;--intel:#1e90ae;--accent:var(--ent);--accent-ink:#f5f4ef;background:var(--paper);color:var(--ink);font-family:var(--font-ibm-plex-sans), ui-sans-serif, system-ui, sans-serif;font-size:16px;line-height:1.55}@media (prefers-color-scheme:dark){.interchange:not([data-theme=light]){--paper:#14171a;--paper-raise:#1b1f22;--paper-sunk:#101316;--ink:#eeeee6;--ink-soft:#aab3ab;--ink-faint:#767f78;--line:#2c322e;--line-strong:#3c443e;--hub:#7c86ff;--hub-ink:#0e1030;--chat:#2bcaad;--pro:#e6a13f;--market:#ff7a56;--ent:#a48bff;--intel:#4fc3e6;--accent:var(--ent);--accent-ink:#140b33}}.interchange[data-theme=dark]{--paper:#14171a;--paper-raise:#1b1f22;--paper-sunk:#101316;--ink:#eeeee6;--ink-soft:#aab3ab;--ink-faint:#767f78;--line:#2c322e;--line-strong:#3c443e;--hub:#7c86ff;--hub-ink:#0e1030;--chat:#2bcaad;--pro:#e6a13f;--market:#ff7a56;--ent:#a48bff;--intel:#4fc3e6;--accent:var(--ent);--accent-ink:#140b33}.interchange *{box-sizing:border-box}.interchange h1,.interchange h2,.interchange h3{font-family:var(--font-bricolage-grotesque), ui-sans-serif, system-ui, sans-serif;text-wrap:balance;letter-spacing:-.01em;margin:0}.interchange .mono{font-family:var(--font-ibm-plex-mono), ui-monospace, monospace}.interchange .label{font-family:var(--font-ibm-plex-mono), ui-monospace, monospace;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-faint);font-size:.72rem}.interchange a{color:inherit}.interchange :focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}.interchange .wrap{max-width:1120px;margin:0 auto;padding:0 32px}.interchange nav.top{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;max-width:1120px;margin:0 auto;padding:20px 32px;display:flex}.interchange .brand{font-family:var(--font-bricolage-grotesque);align-items:center;gap:10px;font-size:1.1rem;font-weight:700;display:flex}.interchange .brand .app{color:var(--accent)}.interchange .brand-mark{background:var(--accent);border-radius:8px;flex:none;place-items:center;width:28px;height:28px;display:grid}.interchange .brand-mark svg{width:16px;height:16px}.interchange .nav-links{color:var(--ink-soft);gap:28px;font-size:.92rem;display:flex}.interchange .nav-links a:hover{color:var(--ink)}.interchange .nav-cta{align-items:center;gap:18px;font-size:.92rem;display:flex}.interchange .btn{font-family:var(--font-ibm-plex-sans);cursor:pointer;border:1px solid #0000;border-radius:8px;align-items:center;gap:8px;padding:10px 18px;font-size:.9rem;font-weight:600;text-decoration:none;display:inline-flex}.interchange .btn-solid{background:var(--accent);color:var(--accent-ink)}.interchange .btn-solid:hover{opacity:.92}.interchange .btn-ghost{border-color:var(--line-strong);color:var(--ink);background:0 0}.interchange .btn-ghost:hover{background:var(--paper-raise)}@media (max-width:760px){.interchange .nav-links{display:none}}@media (max-width:420px){.interchange nav.top{flex-wrap:wrap;row-gap:10px;padding:16px}.interchange .nav-cta{gap:10px}.interchange .btn{padding:9px 14px}.interchange .brand{font-size:.95rem}}.interchange .hero{touch-action:none;text-align:center;max-width:1120px;margin:0 auto;padding:80px 32px 48px;position:relative;overflow:hidden}.interchange .hero-canvas{z-index:0;pointer-events:none;width:100%;height:100%;position:absolute;inset:0;-webkit-mask-image:linear-gradient(#0000 0%,#000 12% 85%,#0000 100%);mask-image:linear-gradient(#0000 0%,#000 12% 85%,#0000 100%)}.interchange .hero>:not(.hero-canvas){z-index:1;position:relative}.interchange .eyebrow{border:1px solid var(--line-strong);background:var(--paper);border-radius:999px;align-items:center;gap:8px;margin-bottom:26px;padding:6px 12px;display:inline-flex}.interchange .eyebrow .dot{background:var(--accent);border-radius:50%;width:6px;height:6px}.interchange .hero h1{max-width:16ch;margin:0 auto;font-size:clamp(2.2rem,5vw,3.6rem);font-weight:700;line-height:1.06}.interchange .hero h1 .accent{color:var(--accent)}.interchange .hero-sub{max-width:52ch;color:var(--ink-soft);margin:22px auto 0;font-size:1.05rem}.interchange .hero-actions{flex-wrap:wrap;justify-content:center;gap:14px;margin-top:30px;display:flex}.interchange .hero-actions .btn{padding:13px 22px;font-size:.95rem}.interchange .checks{border-top:1px solid var(--line);border-bottom:1px solid var(--line);grid-template-columns:repeat(3,1fr);gap:20px;max-width:1120px;margin:0 auto;padding:26px 32px;display:grid}.interchange .checks div{color:var(--ink-soft);padding-left:22px;font-size:.88rem;position:relative}.interchange .checks div:before{content:"✓";color:var(--accent);font-weight:700;position:absolute;left:0}@media (max-width:760px){.interchange .checks{grid-template-columns:1fr}}.interchange section{padding:96px 0 0}.interchange .section-head{text-align:center;max-width:1120px;margin:0 auto;padding:0 32px 40px}.interchange .section-head h2{max-width:26ch;margin:0 auto;font-size:clamp(1.6rem,3vw,2.1rem);font-weight:700}.interchange .section-head p{color:var(--ink-soft);max-width:56ch;margin-top:12px;margin-left:auto;margin-right:auto}.interchange .features{background:var(--line);border:1px solid var(--line);border-radius:16px;grid-template-columns:repeat(3,1fr);gap:1px;max-width:1120px;margin:0 auto;padding:0 32px;display:grid;overflow:hidden}.interchange .feat-card{background:var(--paper);flex-direction:column;gap:10px;padding:28px 26px;display:flex}.interchange .feat-card .ico{background:color-mix(in srgb, var(--accent) 16%, transparent);width:34px;height:34px;color:var(--accent);border-radius:9px;place-items:center;margin-bottom:6px;display:grid}.interchange .feat-card h3{font-size:1.05rem;font-weight:700}.interchange .feat-card p{color:var(--ink-soft);margin:0;font-size:.9rem}@media (max-width:820px){.interchange .features{grid-template-columns:1fr}}.interchange .ecosystem{max-width:1120px;margin:0 auto;padding:0 32px}.interchange .eco-grid{background:var(--line);border:1px solid var(--line);border-radius:16px;grid-template-columns:repeat(5,1fr);gap:1px;display:grid;overflow:hidden}.interchange .eco-card{background:var(--paper);flex-direction:column;gap:6px;min-height:120px;padding:20px 18px;display:flex}.interchange .eco-card.self{background:var(--paper-raise)}.interchange .eco-card .dot2{border-radius:3px;width:9px;height:9px;margin-bottom:4px}.interchange .eco-card strong{font-size:.92rem;font-family:var(--font-bricolage-grotesque);font-weight:700}.interchange .eco-card span{color:var(--ink-faint);font-size:.78rem}@media (max-width:820px){.interchange .eco-grid{grid-template-columns:repeat(2,1fr)}}.interchange .dev-banner{max-width:1120px;margin:56px auto 0;padding:0 32px}.interchange .dev-banner .box{border:1px dashed var(--line-strong);color:var(--ink-soft);border-radius:14px;align-items:flex-start;gap:14px;padding:20px 24px;font-size:.9rem;display:flex}.interchange .dev-banner .box strong{color:var(--ink)}.interchange footer{border-top:1px solid var(--line);margin-top:100px;padding:32px}.interchange .footer-inner{max-width:1120px;color:var(--ink-faint);flex-wrap:wrap;justify-content:space-between;gap:14px;margin:0 auto;font-size:.85rem;display:flex}.interchange.app-shell{background:var(--paper-sunk);grid-template-columns:68px 230px 1fr;align-items:start;min-height:100dvh;display:grid}@media (max-width:639px){.interchange.app-shell{grid-template-columns:1fr}}@media (max-width:819px) and (min-width:640px){.interchange.app-shell{grid-template-columns:68px 1fr}.interchange .nav-side{display:none}}.interchange .rail{background:var(--paper);border-right:1px solid var(--line);flex-direction:column;align-items:center;gap:18px;height:100dvh;padding:16px 0;display:none;position:sticky;top:0}@media (min-width:640px){.interchange .rail{display:flex}}.interchange .rail-brand{flex:none;place-items:center;display:grid}.interchange .rail-apps{flex-direction:column;gap:9px;display:flex}.interchange .rail-app{width:38px;height:38px;color:var(--ink-soft);cursor:pointer;border-radius:10px;place-items:center;display:grid}.interchange .rail-app.active{background:color-mix(in srgb, var(--dot) 16%, transparent);color:var(--dot);cursor:default}.interchange .rail-app:hover:not(.active){background:var(--paper-raise)}.interchange .rail-app svg{width:17px;height:17px}.interchange .rail-spacer{flex:1}.interchange .nav-side{flex-direction:column;gap:12px;height:100dvh;padding:16px 14px;display:none;position:sticky;top:0;overflow-y:auto}@media (min-width:640px){.interchange .nav-side{display:flex}}.interchange .side-card{background:var(--paper-raise);border:1px solid var(--line);border-radius:var(--r-lg,16px);padding:14px}.interchange .e-nav{flex-direction:column;gap:2px;display:flex}.interchange .nav-item{border-radius:var(--r-md,12px);color:var(--ink-soft);cursor:pointer;align-items:center;gap:8px;padding:9px 12px;font-size:14px;font-weight:600;text-decoration:none;display:flex}.interchange .nav-item:hover:not(.active){background:var(--paper-sunk)}.interchange .nav-item.active{background:var(--ent-soft,color-mix(in srgb, var(--ent) 16%, transparent));color:var(--ent)}.interchange .mobile-topbar{border-bottom:1px solid var(--line);background:var(--paper);inset-inline:0;z-index:40;justify-content:space-between;align-items:center;padding:12px 16px;display:flex;position:fixed;top:0}.interchange .mobile-bottomnav{border-top:1px solid var(--line);background:var(--paper);inset-inline:0;z-index:40;padding:8px 4px;display:flex;position:fixed;bottom:0;overflow-x:auto}.interchange .mobile-bottomnav-item{color:var(--ink-soft);white-space:nowrap;padding:4px 10px;font-size:.68rem;font-weight:600;text-decoration:none}.interchange .mobile-bottomnav-item.active{color:var(--ent)}@media (min-width:640px){.interchange .mobile-topbar,.interchange .mobile-bottomnav{display:none}}.interchange .app-main{min-width:0;padding:24px}@media (max-width:639px){.interchange .app-main{padding:76px 16px 84px}}.interchange .e-head-row{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:22px;display:flex}.interchange .e-head-row .e-head{flex:1;min-width:260px;margin-bottom:0}.interchange .e-head-row .tab-search{flex:none;align-self:flex-start;width:220px}.interchange .card{background:var(--paper-raise);border:1px solid var(--line);border-radius:var(--r-lg,16px)}.interchange .grid{gap:16px;display:grid}.interchange .grid-3{grid-template-columns:repeat(3,1fr)}@media (max-width:900px){.interchange .grid-3{grid-template-columns:repeat(2,1fr)}}@media (max-width:560px){.interchange .grid-3{grid-template-columns:1fr}}.interchange .game-card{cursor:pointer;overflow:hidden}.interchange .game-card .thumb{background:var(--ent-soft,color-mix(in srgb, var(--ent) 16%, transparent));justify-content:center;align-items:center;height:110px;font-size:44px;display:flex}.interchange .game-card .body{padding:14px 16px}.interchange .game-card h3{font-size:15px}.interchange .game-card .d{color:var(--ink-faint);margin-top:4px;font-size:12px}.interchange .saved-chip{color:var(--ent);background:var(--ent-soft,color-mix(in srgb, var(--ent) 16%, transparent));border-radius:999px;align-items:center;gap:4px;margin-top:8px;padding:2px 9px;font-size:11px;font-weight:700;display:inline-flex}.interchange .match{align-items:center;gap:16px;padding:18px 20px;display:flex}.interchange .match .vs{flex:1;align-items:center;gap:10px;display:flex}.interchange .match .p{align-items:center;gap:8px;font-size:14px;font-weight:600;display:flex}.interchange .match .p .av{background:var(--ent);color:#fff;border-radius:9px;justify-content:center;align-items:center;width:32px;height:32px;font-size:13px;display:flex}.interchange .match .turn{color:var(--ent);background:var(--ent-soft,color-mix(in srgb, var(--ent) 16%, transparent));border-radius:999px;padding:4px 10px;font-size:12px;font-weight:700}.interchange .board-panel{text-align:center;padding:26px}.interchange .board-grid{border:2px solid var(--ink);border-radius:6px;grid-template-columns:repeat(8,1fr);gap:2px;max-width:280px;margin:18px auto;display:grid;overflow:hidden}.interchange .board-grid.chess{max-width:560px;box-shadow:var(--shadow-card,0 12px 28px #0000002e);border-width:3px;border-radius:10px}.interchange .sq{aspect-ratio:1}.interchange .sq.d{background:#3a3d46}.interchange .sq.l{background:#eae7dd}.interchange .chess-piece{filter:drop-shadow(0 3px 1px #00000059)drop-shadow(0 1px #ffffff26);line-height:1;transition:transform .15s;display:inline-block}.interchange .sq:hover .chess-piece{transform:translateY(-2px)scale(1.06)}.interchange .chess-piece.white{color:#f8f8f4;-webkit-text-stroke:1px #6b6b63}.interchange .chess-piece.black{color:#262524;-webkit-text-stroke:1px #0a0a09}@keyframes chess-piece-land{0%{opacity:.5;transform:scale(.55)translateY(-10px)}60%{opacity:1;transform:scale(1.15)translateY(2px)}to{transform:scale(1)translateY(0)}}.interchange .chess-piece.landed{animation:.32s cubic-bezier(.34,1.56,.64,1) chess-piece-land}.interchange .lb-row{border-bottom:1px solid var(--line);justify-content:space-between;padding:10px 0;font-size:13.5px;display:flex}.interchange .lb-row:last-child{border:0}.interchange .lb-row .rank{font-family:var(--font-ibm-plex-mono), monospace;color:var(--ink-faint);width:24px}.interchange .tourney-card{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-bottom:14px;padding:20px;display:flex}.interchange .tourney-card .t{font-size:15px;font-weight:700}.interchange .tourney-card .d{color:var(--ink-faint);margin-top:4px;font-size:12.5px}.interchange .tourney-status{text-transform:uppercase;border-radius:999px;padding:3px 10px;font-size:11px;font-weight:700}.interchange .tourney-status.registering{background:var(--chat-soft,color-mix(in srgb, var(--chat) 16%, transparent));color:var(--chat)}.interchange .tourney-status.live{background:var(--market-soft,color-mix(in srgb, var(--market) 16%, transparent));color:var(--market)}.interchange .tourney-status.completed{background:var(--line);color:var(--ink-faint)}.interchange .pod-card{overflow:hidden}.interchange .pod-card .cover{background:var(--ent-soft,color-mix(in srgb, var(--ent) 16%, transparent));justify-content:center;align-items:center;height:120px;font-size:40px;display:flex}.interchange .pod-card .body{padding:14px 16px}.interchange .pod-card h3{font-size:14.5px}.interchange .pod-card .d{color:var(--ink-faint);margin-top:4px;font-size:12px}.interchange .pod-icon-opt{border-radius:var(--r-md,12px);border:1px solid var(--line);cursor:pointer;background:var(--paper-sunk);justify-content:center;align-items:center;width:40px;height:40px;font-size:19px;display:flex}.interchange .pod-icon-opt.active{border-color:var(--ent);background:var(--ent-soft,color-mix(in srgb, var(--ent) 16%, transparent))}.interchange .wp-toolbar{gap:10px;margin-bottom:16px;display:flex}.interchange .wp-toolbar .f-input{flex:1}.interchange .wp-back{color:var(--ent);cursor:pointer;margin-bottom:16px;font-size:13px;font-weight:600;display:inline-block}.interchange .wp-dir-row{border-bottom:1px solid var(--line);align-items:center;gap:16px;padding:14px 20px;display:flex}.interchange .wp-dir-row:last-child{border-bottom:none}.interchange .wp-dir-row .t{font-size:14px;font-weight:600}.interchange .wp-dir-row .d{color:var(--ink-faint);margin-top:3px;font-size:12px}.interchange .live-badge{color:#fff;background:#c0392b;border-radius:999px;align-items:center;gap:4px;padding:2px 9px;font-size:10.5px;font-weight:700;display:inline-flex}.interchange .live-badge .dot{background:#fff;border-radius:50%;width:6px;height:6px;animation:1.2s infinite live-pulse}@keyframes live-pulse{0%,to{opacity:1}50%{opacity:.35}}.interchange .step-row{border-bottom:1px solid var(--line);align-items:center;gap:12px;padding:12px 0;display:flex}.interchange .step-row:last-child{border:0}.interchange .step-check{border:2px solid var(--line);cursor:pointer;border-radius:50%;flex:none;justify-content:center;align-items:center;width:22px;height:22px;font-size:12px;display:flex}.interchange .step-check.done{background:var(--ent);border-color:var(--ent);color:#fff}.interchange .step-row .label.done{color:var(--ink-faint);text-decoration:line-through}.interchange .progress-track{background:var(--paper-sunk);border-radius:999px;height:8px;margin:14px 0;overflow:hidden}.interchange .progress-fill{background:var(--ent);border-radius:999px;height:100%;transition:width .3s}.interchange .age-chip{border:1px solid var(--line);background:var(--paper-raise);cursor:pointer;border-radius:999px;padding:8px 16px;font-size:13px}.interchange .age-chip.active{background:var(--ent);color:#fff;border-color:var(--ent)}.interchange .school-row{flex-wrap:wrap;align-items:center;gap:16px;margin-bottom:12px;padding:18px 20px;display:flex}.interchange .school-row .t{font-size:14.5px;font-weight:700}.interchange .school-row .d{color:var(--ink-faint);margin-top:3px;font-size:12.5px}.interchange .school-row .cap{color:var(--ink-faint);font-size:12px}.interchange .f-label{color:var(--ink-soft);margin:0 0 6px;font-size:12.5px;font-weight:600;display:block}.interchange .f-input{border:1px solid var(--line);border-radius:var(--r-md,12px);width:100%;font-size:14px;font-family:var(--font-ibm-plex-sans);background:var(--paper-sunk);color:var(--ink);box-sizing:border-box;padding:11px 14px}.interchange .btn-sm{padding:8px 14px;font-size:.82rem}.interchange .modal-backdrop{z-index:100;opacity:0;pointer-events:none;background:#0f101473;justify-content:center;align-items:center;transition:opacity .2s;display:flex;position:fixed;inset:0}.interchange .modal-backdrop.open{opacity:1;pointer-events:auto}.interchange .modal{background:var(--paper-raise);border-radius:var(--r-lg,16px);width:440px;max-width:92vw;box-shadow:var(--shadow-card,0 8px 20px #00000026);flex-direction:column;max-height:86vh;padding:0;transition:transform .2s;display:flex;overflow:hidden;transform:scale(.94)}.interchange .modal-backdrop.open .modal{transform:scale(1)}.interchange .modal-head{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:18px 20px;display:flex}.interchange .modal-head h3{font-size:16px}.interchange .modal-close{cursor:pointer;width:30px;height:30px;color:var(--ink-faint);background:0 0;border:none;border-radius:50%;flex:none;justify-content:center;align-items:center;display:flex}.interchange .modal-close:hover{background:var(--paper-sunk)}.interchange .modal-body{padding:20px;overflow-y:auto}.interchange .modal-actions{border-top:1px solid var(--line);justify-content:flex-end;gap:10px;padding:16px 20px;display:flex}.interchange .helper{color:var(--ink-faint);margin-top:6px;font-size:12px}@media (prefers-reduced-motion:reduce){.interchange *{scroll-behavior:auto!important}}