:root{--primary: #4F46E5;--primary-hover: #4338CA;--primary-light: #EEF2FF;--bg: #0f1117;--bg-surface: #1a1d27;--bg-card: #22252f;--bg-hover: #2a2d3a;--text: #e8eaed;--text-secondary: #9ca3af;--text-muted: #6b7280;--border: #2d3040;--success: #22c55e;--warning: #f59e0b;--danger: #ef4444;--radius: 12px;--shadow: 0 4px 24px rgba(0, 0, 0, .3);--font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none}button{font-family:var(--font);cursor:pointer;border:none;outline:none}input,select,textarea{font-family:var(--font);outline:none}.layout{display:flex;height:100vh;overflow:hidden}.sidebar{width:320px;background:var(--bg-surface);border-right:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0}.main-content{flex:1;display:flex;flex-direction:column;overflow-y:auto}.sidebar-header{padding:20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:12px}.sidebar-logo{font-size:18px;font-weight:700;color:var(--text);display:flex;align-items:center;gap:8px}.sidebar-logo span{font-size:22px}.sidebar-actions{display:flex;gap:8px}.icon-btn{width:36px;height:36px;border-radius:10px;background:var(--bg-card);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;font-size:18px;transition:all .2s;border:1px solid var(--border)}.icon-btn:hover{background:var(--bg-hover);color:var(--text)}.session-list{flex:1;overflow-y:auto;padding:8px}.session-list::-webkit-scrollbar{width:4px}.session-list::-webkit-scrollbar-thumb{background:#444;border-radius:4px}.session-item{padding:14px 16px;border-radius:10px;cursor:pointer;display:flex;align-items:center;gap:12px;transition:background .15s;margin-bottom:2px}.session-item:hover{background:var(--bg-hover)}.session-item.active{background:var(--primary)}.session-item.active .session-name{color:#fff}.session-item.active .session-preview,.session-item.active .session-time{color:#ffffffb3}.session-avatar{width:42px;height:42px;border-radius:50%;background:var(--bg-card);display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0;border:2px solid var(--border)}.session-item.active .session-avatar{border-color:#ffffff4d}.session-info{flex:1;min-width:0}.session-name{font-size:14px;font-weight:600;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.session-preview{font-size:12px;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}.session-meta{text-align:right;flex-shrink:0}.session-time{font-size:11px;color:var(--text-muted)}.session-badge{background:var(--primary);color:#fff;font-size:10px;font-weight:700;width:20px;height:20px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;margin-top:4px}.chat-header{padding:16px 24px;border-bottom:1px solid var(--border);background:var(--bg-surface);display:flex;align-items:center;gap:12px;overflow:hidden;flex-shrink:0}.chat-header-info h2{font-size:16px;font-weight:600}.chat-header-info p{font-size:12px;color:var(--text-secondary);margin-top:2px;word-break:break-all;overflow:hidden}.chat-messages{flex:1;overflow-y:auto;padding:20px 24px;display:flex;flex-direction:column;gap:12px}.chat-messages::-webkit-scrollbar{width:4px}.chat-messages::-webkit-scrollbar-thumb{background:#444;border-radius:4px}.msg-bubble{max-width:70%;animation:fadeSlide .25s ease}@keyframes fadeSlide{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.msg-bubble.customer{align-self:flex-start}.msg-bubble.merchant{align-self:flex-end}.msg-content{padding:12px 16px;border-radius:14px;font-size:14px;line-height:1.5}.msg-bubble.customer .msg-content{background:var(--bg-card);border:1px solid var(--border);border-bottom-left-radius:4px}.msg-bubble.merchant .msg-content{background:var(--primary);color:#fff;border-bottom-right-radius:4px}.msg-original{font-size:14px}.msg-translated{font-size:12px;opacity:.7;margin-top:6px;padding-top:6px;border-top:1px solid rgba(255,255,255,.15);font-style:italic}.msg-bubble.customer .msg-translated{border-top-color:var(--border)}.msg-time{font-size:10px;color:var(--text-muted);margin-top:4px;padding:0 4px}.msg-bubble.merchant .msg-time{text-align:right}.chat-input-area{padding:16px 24px;padding-bottom:calc(16px + env(safe-area-inset-bottom,0px));border-top:1px solid var(--border);background:var(--bg-surface);display:flex;align-items:flex-end;gap:12px;flex-shrink:0}.chat-input{flex:1;background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:12px 16px;color:var(--text);font-size:14px;resize:none;min-height:44px;max-height:120px;line-height:1.4;transition:border-color .2s}.chat-input:focus{border-color:var(--primary)}.chat-input::placeholder{color:var(--text-muted)}.send-btn{height:44px;padding:0 20px;border-radius:12px;background:var(--primary);color:#fff;font-size:14px;font-weight:600;display:flex;align-items:center;gap:6px;transition:background .2s,transform .1s;flex-shrink:0}.send-btn:hover{background:var(--primary-hover)}.send-btn:active{transform:scale(.97)}.send-btn:disabled{opacity:.5;cursor:not-allowed}.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-secondary);gap:12px;padding:40px}.empty-state-icon{font-size:48px}.empty-state h3{font-size:18px;color:var(--text)}.empty-state p{font-size:14px;text-align:center;max-width:400px}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#0f1117,#1a1d35);padding:20px}.auth-card{background:var(--bg-surface);border:1px solid var(--border);border-radius:20px;padding:40px;width:100%;max-width:420px;box-shadow:var(--shadow)}.auth-card h1{font-size:24px;font-weight:700;margin-bottom:4px;text-align:center}.auth-card .tagline{color:var(--text-secondary);font-size:13px;text-align:center;margin-bottom:28px}.form-group{margin-bottom:16px}.form-group label{display:block;font-size:13px;font-weight:500;color:var(--text-secondary);margin-bottom:6px}.form-input{width:100%;background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:12px 14px;color:var(--text);font-size:14px;transition:border-color .2s}.form-input:focus{border-color:var(--primary)}.btn-primary{width:100%;padding:12px;border-radius:10px;background:var(--primary);color:#fff;font-size:15px;font-weight:600;transition:background .2s;margin-top:8px}.btn-primary:hover{background:var(--primary-hover)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.auth-switch{text-align:center;margin-top:20px;font-size:13px;color:var(--text-secondary)}.auth-switch a{font-weight:600}.error-msg{background:#ef44441a;border:1px solid rgba(239,68,68,.3);color:#fca5a5;padding:10px 14px;border-radius:8px;font-size:13px;margin-bottom:16px}.settings-page{padding:32px;max-width:680px;margin:0 auto;overflow-y:auto;flex:1}.settings-page h1{font-size:24px;font-weight:700;margin-bottom:8px}.settings-page .subtitle{color:var(--text-secondary);font-size:14px;margin-bottom:32px}.settings-section{background:var(--bg-surface);border:1px solid var(--border);border-radius:16px;padding:24px;margin-bottom:20px}.settings-section h2{font-size:16px;font-weight:600;margin-bottom:16px}.settings-row{display:flex;align-items:center;gap:16px;margin-bottom:16px}.settings-row:last-child{margin-bottom:0}.settings-row label{font-size:13px;color:var(--text-secondary);width:140px;flex-shrink:0}.settings-row input,.settings-row select{flex:1;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;padding:10px 12px;color:var(--text);font-size:14px}.embed-code{background:var(--bg-card);border:1px solid var(--border);border-radius:10px;padding:16px;font-family:Fira Code,monospace;font-size:13px;color:var(--success);word-break:break-all;line-height:1.6;position:relative}.copy-btn{position:absolute;top:8px;right:8px;background:var(--primary);color:#fff;padding:6px 12px;border-radius:6px;font-size:12px;font-weight:600}.copy-btn:hover{background:var(--primary-hover)}.navbar{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:var(--bg-surface);border-bottom:1px solid var(--border)}.nav-links{display:flex;gap:8px}.nav-link{padding:8px 16px;border-radius:8px;font-size:14px;font-weight:500;color:var(--text-secondary);background:transparent;transition:all .15s}.nav-link:hover{background:var(--bg-hover);color:var(--text)}.nav-link.active{background:var(--primary);color:#fff}.nav-user{display:flex;align-items:center;gap:12px}.nav-user-email{font-size:13px;color:var(--text-secondary)}.btn-logout{padding:8px 16px;border-radius:8px;background:var(--bg-card);color:var(--text-secondary);font-size:13px;border:1px solid var(--border);transition:all .15s}.btn-logout:hover{background:var(--danger);color:#fff;border-color:var(--danger)}@media (max-width: 768px){.layout{flex-direction:column}.sidebar{width:100%;max-height:40vh;overflow-y:auto}.layout.chat-active .sidebar{display:none}.layout.chat-active .main-content{height:100vh;height:100dvh}.chat-header{padding:10px 12px}.chat-header-info h2{font-size:14px}.chat-header-info p{font-size:9px!important;line-height:1.3;max-height:40px;overflow:hidden}.chat-input-area{padding:10px 12px;padding-bottom:calc(10px + env(safe-area-inset-bottom,0px))}.back-btn{display:block!important}.settings-row{flex-direction:column;align-items:stretch}.settings-row label{width:auto}.navbar{flex-wrap:wrap;padding:8px 12px;gap:8px}.nav-links{order:3;width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;white-space:nowrap;gap:4px!important;padding-bottom:4px}.nav-link{font-size:12px!important;padding:6px 10px!important;white-space:nowrap}.nav-user{margin-left:auto}.nav-user-email{max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:11px!important}.sidebar-logo{font-size:14px!important}.settings-page{padding:16px 12px!important}.settings-page h1{font-size:20px!important}.settings-section{padding:16px 12px!important}.embed-code{font-size:11px!important}.embed-code pre{font-size:10px!important;word-break:break-all!important;white-space:pre-wrap!important}}