:root{--bg: #f7f7f8;--surface: #ffffff;--border: #e2e2e6;--text: #1c1c1e;--muted: #6b6b73;--accent: #2f6fed;--danger: #c0392b;--radius: 10px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Hiragino Sans,Noto Sans JP,sans-serif;font-size:15px;line-height:1.6}.app{min-height:100vh;display:flex;flex-direction:column}.header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 20px;background:var(--surface);border-bottom:1px solid var(--border);flex-wrap:wrap}.brand{font-weight:700;font-size:17px;text-decoration:none;color:var(--text)}.nav{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.nav a{color:var(--accent);text-decoration:none}.who{color:var(--muted)}.main{flex:1;width:100%;max-width:900px;margin:0 auto;padding:24px 20px 48px}.stack{display:flex;flex-direction:column;gap:14px}.narrow{max-width:460px}.row{display:flex;gap:10px;align-items:flex-end;flex-wrap:wrap}h1{font-size:22px;margin:0}label{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--muted);flex:1}label.check{flex-direction:row;align-items:center;gap:8px}input,textarea{font:inherit;padding:9px 11px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--text);width:100%}input[type=checkbox]{width:auto}button{font:inherit;padding:9px 18px;border:0;border-radius:var(--radius);background:var(--accent);color:#fff;cursor:pointer;white-space:nowrap}button:disabled{opacity:.5;cursor:default}button.secondary{background:var(--surface);color:var(--danger);border:1px solid var(--border)}button.linklike{background:none;color:var(--accent);padding:0;text-align:left}.muted{color:var(--muted)}.small{font-size:13px}.error{color:var(--danger)}.desc{white-space:pre-wrap}.cards{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:12px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px}.card-title{font-weight:600;font-size:16px;color:var(--text);text-decoration:none;margin:0}.card-purpose{margin:4px 0;color:var(--muted)}.room{display:flex;flex-direction:column;gap:12px;height:calc(100vh - 140px)}.room-head h1{margin-bottom:2px}.messages{flex:1;overflow-y:auto;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px;display:flex;flex-direction:column;gap:8px}.msg{background:#ffffffeb;border:1px solid var(--border);border-radius:14px 14px 14px 4px;padding:7px 11px;max-width:80%;align-self:flex-start;word-break:break-word}.msg.mine{align-self:flex-end;background:var(--accent);border-color:var(--accent);border-radius:14px 14px 4px;color:#fff}.msg.system{align-self:center;background:transparent;border:0;color:var(--muted);font-size:13px}.msg.pending{opacity:.55}.msg-nick{display:block;font-size:12px;color:var(--muted)}.msg-image{display:block;max-width:260px;border-radius:6px;margin-top:4px}.composer{display:flex;gap:8px}.composer input[type=text],.composer input:not([type]){flex:1}