:root{--bg: #0d0d0f;--card: #141416;--border: #222226;--text: #e0e0e0;--muted: #5c5c66;--accent: #5b5bff;--danger: #ff5252;--success: #00c853;--radius: 8px}*{margin:0;padding:0;box-sizing:border-box}html,body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);height:100%;overflow:hidden}body{display:flex;justify-content:center;align-items:center}.hidden{display:none!important}#auth-screen{width:100%;max-width:400px;margin:0 16px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:32px 24px}#auth-screen h1{text-align:center;margin-bottom:24px;font-size:20px}#auth-screen h1 span{color:var(--accent)}.form-group{margin-bottom:12px}.form-group label{display:block;font-size:12px;color:var(--muted);margin-bottom:4px}.form-group input{width:100%;padding:10px 12px;background:#ffffff08;border:1px solid var(--border);border-radius:var(--radius);color:var(--text);font-size:14px;outline:none}.form-group input:focus{border-color:var(--accent)}.btn{width:100%;padding:12px;border:none;border-radius:var(--radius);font-size:14px;font-weight:600;cursor:pointer;margin-top:8px;transition:opacity .15s}.btn:active{opacity:.8}.btn-primary{background:var(--accent);color:#fff}.btn-secondary{background:transparent;border:1px solid var(--border);color:var(--text)}.toggle-link{text-align:center;margin-top:16px;font-size:13px;color:var(--muted)}.toggle-link a{color:var(--accent);cursor:pointer;text-decoration:none}.error-msg{color:var(--danger);font-size:12px;margin-top:8px;text-align:center}#chat-screen{width:100%;height:100%;display:flex;flex-direction:column;background:var(--card);overflow:hidden}.chat-header{padding:12px 16px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;flex-shrink:0;gap:12px}.chat-header h2{font-size:16px;white-space:nowrap}.chat-header .user-info{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:12px;min-width:0}.chat-header .user-info span:first-child{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-header .logout{color:var(--danger);cursor:pointer;font-size:12px;white-space:nowrap;padding:4px 8px;border-radius:4px;transition:background .15s}.chat-header .logout:hover{background:#ff52521a}#messages{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:6px;-webkit-overflow-scrolling:touch}.msg{max-width:85%;padding:8px 12px;border-radius:12px;font-size:14px;line-height:1.4;word-break:break-word}.msg.mine{align-self:flex-end;background:var(--accent);color:#fff;border-bottom-right-radius:4px}.msg.other{align-self:flex-start;background:#ffffff0d;color:var(--text);border-bottom-left-radius:4px}.msg .author{font-size:11px;opacity:.7;margin-bottom:2px}.msg .time{font-size:10px;opacity:.5;margin-top:4px}.msg-img{max-width:100%;max-height:320px;border-radius:8px;display:block;cursor:pointer;transition:opacity .15s}.msg-img:hover{opacity:.9}.msg:has(.msg-img){background:transparent;padding:0}.msg.other:has(.msg-img) .author{padding:0 4px}.system-msg{text-align:center;font-size:12px;color:var(--muted);padding:8px}.chat-input-wrap{padding:10px 12px;border-top:1px solid var(--border);display:flex;gap:8px;flex-shrink:0}.chat-input-wrap input{flex:1;padding:10px 14px;background:#ffffff08;border:1px solid var(--border);border-radius:20px;color:var(--text);font-size:14px;outline:none;min-width:0}.chat-input-wrap input:focus{border-color:var(--accent)}.chat-input-wrap input[type=file].hidden-input{display:none}.attach-btn{background:transparent;border:1px solid var(--border);color:var(--muted);border-radius:50%;width:38px;height:38px;font-size:16px;cursor:pointer;flex-shrink:0;display:flex;align-items:center;justify-content:center;transition:color .15s,border-color .15s}.attach-btn:hover{color:var(--text);border-color:var(--accent)}.chat-input-wrap button{padding:10px 18px;background:var(--accent);color:#fff;border:none;border-radius:20px;font-size:14px;font-weight:600;cursor:pointer;white-space:nowrap;transition:opacity .15s}.chat-input-wrap button:active{opacity:.8}.loading{color:var(--muted);text-align:center;padding:40px}@media(min-width:640px){body{padding:16px}#auth-screen{margin:0;padding:32px}#chat-screen{max-width:700px;max-height:90vh;border:1px solid var(--border);border-radius:var(--radius)}.chat-header{padding:16px 20px}#messages{padding:16px 20px;gap:8px}.msg{max-width:80%;padding:10px 14px}.chat-input-wrap{padding:12px 20px}}@supports (padding-bottom: env(safe-area-inset-bottom)){.chat-input-wrap{padding-bottom:calc(10px + env(safe-area-inset-bottom))}}@media(min-width:640px){@supports (padding-bottom: env(safe-area-inset-bottom)){.chat-input-wrap{padding-bottom:calc(12px + env(safe-area-inset-bottom))}}}