:root{--ink: #163b50;--muted: #6f8a98;--line: #e2edf0;--bg: #eaf2f5;--paper: #f7fafb;--card: #fff;--sea: #0b7f9c;--sea-deep: #074663;--sea-soft: #e4f5f7;--green: #128a5a;--green-soft: #e3f6ec;--orange: #a35b00;--orange-soft: #fff1dc;--red: #b42318;--red-soft: #fdecea;--blue-soft: #e6f1fb;--radius: 16px;font-family:Hiragino Sans,Noto Sans JP,Yu Gothic UI,system-ui,sans-serif;color:var(--ink);background:var(--bg);-webkit-text-size-adjust:100%}*{box-sizing:border-box}body{margin:0;line-height:1.6}a{color:var(--sea)}h1,h2,h3{line-height:1.35}.shell{max-width:560px;margin:auto;min-height:100dvh;background:var(--paper);padding-bottom:calc(76px + env(safe-area-inset-bottom))}.shell.center{display:flex;flex-direction:column;justify-content:center;gap:12px;padding:24px 16px}header{background:#fff;display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}.brand{display:flex;gap:10px;align-items:center;min-width:0}.brand>div:last-child{min-width:0}.mark{background:#dff5f5;border-radius:12px;font-size:20px;padding:6px 8px}.brand strong{display:block;font-size:15px}.brand span{color:var(--sea)}.brand small{display:block;font-size:11px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.head-btn{border:1px solid #cce2e8;border-radius:999px;background:#f0f8fa;padding:8px 14px;color:#14617b;font-weight:700;font-size:13px;text-decoration:none;white-space:nowrap}main{padding:18px 16px}.page-head{margin-bottom:14px}.page-head h1{font-size:22px;margin:4px 0}.eyebrow{font-size:10px;font-weight:800;color:#148baa;letter-spacing:1.4px}.eyebrow.light{color:#a6edf5}.muted{color:var(--muted)}.small{font-size:13px}.hero{background:linear-gradient(125deg,var(--sea-deep),#138ba8);border-radius:20px;padding:22px;color:#fff;margin-bottom:16px}.hero h1{font-size:22px;margin:8px 0}.hero 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0}.rsvp{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:10px;padding:8px 10px 8px 14px;border-radius:12px;background:#f2f6f8}.rsvp.is-going{background:var(--green-soft)}.rsvp-state{font-weight:700;font-size:14px}.rsvp.is-going .rsvp-state{color:var(--green)}.link{display:inline-block;margin-top:8px;font-size:14px;font-weight:700}.msg{display:flex;align-items:center;gap:8px;flex-wrap:wrap;border-radius:10px;padding:10px 12px;margin:8px 0;font-size:14px;font-weight:600}.msg.ok{background:var(--green-soft);color:var(--green)}.msg.err{background:var(--red-soft);color:var(--red)}.msg.busy{background:#f0f5f7;color:#3f6170}.msg .btn{width:auto;min-height:36px;margin:0}.spinner{width:16px;height:16px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;display:inline-block;animation:spin .8s linear infinite;flex:none}@keyframes 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a{flex:none}.done{text-align:center;padding:30px 8px}.done-icon{font-size:56px}nav#nav{position:fixed;bottom:0;left:0;right:0;max-width:560px;margin:auto;background:#fff;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(5,1fr);padding-bottom:env(safe-area-inset-bottom);z-index:5}nav#nav a{display:flex;flex-direction:column;align-items:center;gap:1px;padding:8px 0 9px;font-size:11px;color:#6f8a98;text-decoration:none}nav#nav a b{font-size:19px;line-height:1.2}nav#nav a.active{color:var(--sea);font-weight:700}.modal{position:fixed;inset:0;background:#0c2a3a99;display:flex;align-items:center;justify-content:center;padding:16px;z-index:50}.modal-box{background:#fff;border-radius:16px;padding:18px;width:100%;max-width:380px}.modal-box p{margin:0 0 12px;font-weight:600}.modal-box .row .btn{flex:1;margin:0}.viewer-box{background:#fff;border-radius:16px;width:100%;max-width:720px;max-height:92dvh;display:flex;flex-direction:column;overflow:hidden}.viewer-head{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;border-bottom:1px solid var(--line)}.viewer-body{overflow:auto;padding:8px;text-align:center}.viewer-body img{max-width:100%;height:auto}.toast{position:fixed;left:50%;bottom:90px;transform:translate(-50%,20px);opacity:0;background:#163b50;color:#fff;padding:10px 16px;border-radius:999px;font-size:14px;transition:.25s;z-index:60}.toast.show{opacity:1;transform:translate(-50%)}@media (min-width: 900px){.shell{max-width:760px}nav#nav{max-width:760px}.tiles.four{grid-template-columns:repeat(4,1fr)}}@media (max-width: 360px){main{padding:14px 12px}.grid2{grid-template-columns:1fr}}