:root{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.5;color:#111827;background-color:#f3f4f6}*{box-sizing:border-box}body{margin:0}.chat-page{min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(#0006,#0006),url(/3.jpg);background-size:cover;background-position:center}.chat-card{width:min(980px,100%);height:min(85vh,760px);background:#fff;border-radius:16px;box-shadow:0 10px 30px #00000014;display:grid;grid-template-rows:auto 1fr;overflow:hidden}.chat-header{padding:16px 20px;font-size:1.1rem;font-weight:700;border-bottom:1px solid #e5e7eb}.chat-layout{display:grid;grid-template-columns:310px 1fr;min-height:0}.friends-panel{border-right:1px solid #e5e7eb;padding:12px;display:grid;gap:12px;overflow-y:auto;align-content:start}.self-row{display:flex;justify-content:space-between;align-items:center;gap:8px}.self-name{font-weight:700;color:#111827}.add-friend-row{display:grid;grid-template-columns:1fr auto;gap:8px}.add-friend-row input{border:1px solid #d1d5db;border-radius:8px;padding:9px 10px}.add-friend-row button{border:0;border-radius:8px;padding:0 12px;font-weight:600;color:#fff;background:#2563eb;cursor:pointer}.add-friend-row button:disabled{opacity:.45;cursor:not-allowed}.request-list,.friends-list{display:grid;gap:8px}.request-list h3,.friends-list h3{margin:0;font-size:.95rem}.request-item{padding:8px;border:1px solid #e5e7eb;border-radius:8px;display:flex;justify-content:space-between;align-items:center;gap:8px}.request-item div{display:flex;gap:6px}.small-btn{border:0;border-radius:6px;padding:6px 9px;font-size:.8rem;font-weight:600;background:#2563eb;color:#fff;cursor:pointer}.small-btn.ghost{background:#e5e7eb;color:#111827}.friend-btn{border:1px solid #e5e7eb;border-radius:8px;padding:9px 10px;text-align:left;background:#fff;cursor:pointer}.friend-btn.active{background:#eff6ff;border-color:#93c5fd}.chat-main{min-height:0;display:grid;grid-template-rows:auto 1fr auto}.chat-status{padding:10px 14px;border-bottom:1px solid #e5e7eb;font-size:.85rem;color:#1d4ed8;font-weight:600}.auth-panel{padding:20px;display:grid;gap:14px}.auth-mode-row{display:grid;grid-template-columns:1fr 1fr;gap:8px}.tab{border:1px solid #d1d5db;background:#fff;border-radius:8px;padding:10px;cursor:pointer;font-weight:600}.tab.active{background:#2563eb;color:#fff;border-color:#2563eb}.auth-form{display:grid;gap:10px}.auth-form label{display:grid;gap:4px;font-size:.85rem}.auth-form input{border:1px solid #d1d5db;border-radius:8px;padding:9px 10px}.auth-form button{border:0;border-radius:8px;padding:10px 12px;background:#2563eb;color:#fff;font-weight:600;cursor:pointer}.auth-error{margin:0;color:#b91c1c;font-size:.9rem}.logout-btn{border:1px solid #d1d5db;border-radius:8px;padding:8px 12px;background:#fff;cursor:pointer;font-weight:600}.chat-messages{padding:16px;overflow-y:auto;display:grid;align-content:start;gap:12px;background:#f9fafb}.empty-state{margin:0;color:#6b7280;text-align:center}.msg{max-width:80%;padding:10px 12px;border-radius:12px}.msg-meta{display:flex;justify-content:space-between;gap:12px;font-size:.75rem;opacity:.8;margin-bottom:4px}.msg p{margin:0;word-break:break-word}.msg-you{margin-left:auto;background:#2563eb;color:#fff}.msg-other{margin-right:auto;background:#e5e7eb}.chat-input-row{padding:14px;display:grid;grid-template-columns:1fr auto;gap:10px;border-top:1px solid #e5e7eb;background:#fff}.chat-input-row input{border:1px solid #d1d5db;border-radius:10px;padding:10px 12px;font-size:1rem}.chat-input-row input:focus,.add-friend-row input:focus,.auth-form input:focus{outline:2px solid #93c5fd;border-color:#93c5fd}.chat-input-row button{border:0;border-radius:10px;padding:0 16px;font-weight:600;color:#fff;background:#2563eb;cursor:pointer}.chat-input-row button:disabled{opacity:.45;cursor:not-allowed}@media (max-width: 640px){.chat-page{padding:10px}.chat-card{height:92vh}.chat-layout{grid-template-columns:1fr}.friends-panel{border-right:0;border-bottom:1px solid #e5e7eb;max-height:40vh}}