:root{--ink:#16232e;--green:#33513f;--green-dark:#25392c;--gold:#b98b2e;--paper:#f1f3ee;--card:#fff;--graphite:#6b6f76;--coral:#b5533c;--line:#dcdfd6}*{box-sizing:border-box}body{background:var(--paper);color:var(--ink);margin:0;font-family:Arial Nova,Arial,sans-serif}h1,h2,h3,h4,h5,h6,button,input,textarea,select{font-family:Arial Nova,Arial,sans-serif}.app{min-height:100vh;display:flex}.sidebar{background:var(--ink);color:#edefea;flex-shrink:0;width:220px;padding:28px 18px}.sidebar h1{color:#fff;margin:0 0 28px;font-size:20px;font-weight:600}.nav-item{color:#c9cfc9;border-radius:6px;margin-bottom:4px;padding:10px 12px;font-size:14px;text-decoration:none;display:block}.nav-item:hover{background:#ffffff0f}.nav-item.active{background:var(--green);color:#fff}.main{flex:1;max-width:900px;padding:32px 40px}.page-title{margin:0 0 6px;font-size:26px;font-weight:600}.page-sub{color:var(--graphite);margin:0 0 26px;font-size:14px}.card{background:var(--card);border:1px solid var(--line);border-radius:10px;margin-bottom:14px;padding:18px 20px}.btn{cursor:pointer;border:none;border-radius:6px;padding:9px 16px;font-family:inherit;font-size:13px;font-weight:600}.btn-primary{background:var(--green);color:#fff}.btn-primary:hover{background:var(--green-dark)}input{border:1px solid var(--line);border-radius:6px;width:100%;padding:9px 12px;font-family:inherit;font-size:14px}.notice{color:#7a5c10;background:#fcf6e8;border:1px solid #ebd9a5;border-radius:8px;margin-bottom:18px;padding:14px 16px;font-size:13px;line-height:1.5}.file-row{border-bottom:1px solid var(--line);align-items:center;gap:12px;padding:10px 0;font-size:13px;display:flex}.file-row:last-child{border-bottom:none}.file-row a{color:var(--green);font-weight:600;text-decoration:none}.msg-layout{gap:20px;height:480px;display:flex}.thread-list{border-right:1px solid var(--line);width:200px;padding-right:14px;overflow-y:auto}.thread-item{color:var(--ink);border-radius:6px;margin-bottom:2px;padding:10px;font-size:13px;text-decoration:none;display:block}.thread-item:hover{background:var(--paper)}.thread-item.active{background:var(--green);color:#fff}.thread-panel{flex-direction:column;flex:1;display:flex}.thread-msgs{flex-direction:column;flex:1;gap:8px;padding:4px 2px;display:flex;overflow-y:auto}.bubble{border-radius:12px;max-width:70%;padding:9px 12px;font-size:13px;line-height:1.4}.bubble.mine{background:var(--green);color:#fff;align-self:flex-end}.bubble.theirs{background:var(--paper);color:var(--ink);align-self:flex-start}.msg-input{gap:8px;margin-top:12px;display:flex}.empty{color:var(--graphite);padding:20px 0;font-size:14px}