.chat-window{background:var(--bg-primary,#0f172a);width:100%;height:100%;min-height:0;color:var(--text-primary,#fff);flex-direction:column;flex:1;display:flex;position:relative;overflow-y:auto}.chat-window.empty-state{flex:1;justify-content:center;align-items:center;padding:24px 20px;display:flex;overflow-y:auto}.welcome-screen{text-align:center;width:100%;max-width:960px;margin:auto}.welcome-logo{margin-bottom:8px;font-size:42px;display:inline-block}.welcome-header h1{color:#fff;margin-bottom:6px;font-size:28px;font-weight:700}.highlight-gradient{background:linear-gradient(135deg,#60a5fa,#a855f7);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.welcome-header p{color:#94a3b8;max-width:500px;margin:0 auto;font-size:14px}.welcome-grid{text-align:left;grid-template-columns:repeat(3,1fr);gap:14px;display:grid}@media (width<=900px){.welcome-grid{grid-template-columns:repeat(2,1fr)}}@media (width<=600px){.welcome-grid{grid-template-columns:1fr}}.welcome-card{cursor:pointer;background:#1e293b;border:1px solid #334155;border-radius:12px;flex-direction:column;padding:16px;transition:all .2s;display:flex}.welcome-card:hover{background:#243248;border-color:#3b82f6;transform:translateY(-3px)}.welcome-card.active-card{background:#60a5fa1a;border-color:#60a5fa}.card-top-row{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}.card-icon{font-size:22px}.card-tag{text-transform:uppercase;color:#60a5fa;background:#3b82f626;border-radius:4px;padding:2px 6px;font-size:10px;font-weight:700}.welcome-card h3{color:#f8fafc;margin-bottom:4px;font-size:15px;font-weight:600}.messages-container{flex-direction:column;gap:14px;width:100%;max-width:860px;margin:0 auto;padding:20px;display:flex}:root,[data-theme=dark]{--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#334155;--text-primary:#f8fafc;--text-secondary:#cbd5e1;--text-muted:#64748b;--accent-primary:#3b82f6;--accent-hover:#60a5fa;--border-color:#ffffff1a;--card-shadow:0 4px 6px -1px #0000004d, 0 2px 4px -1px #0003;--radius-md:12px;--radius-lg:16px}[data-theme=light]{--bg-primary:#f8fafc;--bg-secondary:#fff;--bg-tertiary:#f1f5f9;--text-primary:#0f172a;--text-secondary:#334155;--text-muted:#64748b;--accent-primary:#2563eb;--accent-hover:#1d4ed8;--border-color:#0000001a;--card-shadow:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f;--radius-md:12px;--radius-lg:16px}:root{--font-main:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-size-sm:.875rem;--font-size-base:1rem;--font-size-lg:1.125rem;--font-size-xl:1.5rem;--font-size-2xl:2rem}.sidebar{background-color:var(--bg-secondary);width:280px;height:100vh;color:var(--text-primary);border-right:1px solid var(--border-color);flex-direction:column;flex-shrink:0;padding:20px;transition:width .3s;display:flex;position:relative}.sidebar.collapsed{width:80px;padding:20px 10px}.logo{align-items:center;gap:12px;margin-bottom:25px;display:flex}.logo-icon{background:linear-gradient(135deg, var(--accent-primary), #7c3aed);border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;font-size:22px;display:flex}.logo-text h2{white-space:nowrap;margin:0;font-size:18px}.logo-text p{color:var(--text-muted);margin:0;font-size:11px}.new-chat{color:#fff;-webkit-user-select:none;user-select:none;background:linear-gradient(135deg,#4f46e5 0%,#7c3aed 100%);border:1px solid #ffffff26;border-radius:12px;justify-content:center;align-items:center;gap:10px;width:calc(100% - 24px);margin:12px auto;padding:12px 18px;font-size:14px;font-weight:600;transition:all .2s ease-in-out;display:flex;box-shadow:0 4px 12px #4f46e54d;cursor:pointer!important;z-index:20!important;pointer-events:auto!important;position:relative!important}.new-chat:hover{filter:brightness(1.08);transform:translateY(-2px);box-shadow:0 6px 16px #7c3aed73}.new-chat:active{transform:scale(.98)}.new-chat span{pointer-events:none}.new-chat svg{pointer-events:none;font-size:18px}.history-container{flex:1;margin-bottom:15px;overflow-y:auto}.history-container::-webkit-scrollbar{display:none}.section-title{text-transform:uppercase;color:var(--text-muted);margin-bottom:8px;padding-left:5px;font-size:11px}.history-item{cursor:pointer;color:var(--text-secondary);border-radius:8px;align-items:center;gap:10px;padding:10px;transition:all .2s;display:flex;position:relative}.history-item:hover{background:var(--bg-tertiary);color:var(--text-primary)}.history-item.active{background:var(--accent-primary);color:#fff}.item-title{text-overflow:ellipsis;white-space:nowrap;font-size:14px;overflow:hidden}.sidebar-section{margin-bottom:15px}.tools-grid{grid-template-columns:repeat(2,1fr);gap:10px;padding:5px;display:grid}.tool-item{cursor:pointer;background:var(--bg-tertiary);color:var(--text-primary);box-sizing:border-box;border:1px solid #0000;border-radius:10px;align-items:center;gap:10px;width:100%;padding:12px 8px;transition:all .2s;display:flex}.tool-item:hover{background-color:var(--bg-secondary);border-color:var(--accent-primary)}.tool-item.active-tool{background-color:var(--accent-primary);color:#fff;box-shadow:0 4px 12px rgba(var(--accent-primary-rgb), .3)}.tool-icon{flex-shrink:0;justify-content:center;align-items:center;font-size:1.2rem;display:flex}.tool-label{white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:500;overflow:hidden}.sidebar.collapsed .tools-grid{grid-template-columns:1fr;gap:15px}.sidebar.collapsed .tool-item{background:0 0;justify-content:center;padding:10px 0}.sidebar.collapsed .tool-label{display:none}.search-box{background:var(--bg-tertiary);border-radius:10px;align-items:center;gap:10px;margin-bottom:15px;padding:8px 12px;display:flex}.search-box input{color:var(--text-primary);background:0 0;border:none;outline:none;width:100%;font-size:14px}.sidebar-footer{border-top:1px solid var(--border-color);flex-direction:row;justify-content:space-between;align-items:center;padding-top:15px;display:flex}.footer-btn-icon{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:8px;justify-content:center;align-items:center;padding:8px;font-size:20px;transition:all .2s;display:flex}.footer-btn-icon:hover{background:var(--bg-tertiary);color:var(--accent-primary)}.chat-dropdown{background:var(--bg-secondary);border:1px solid var(--border-color);box-shadow:var(--card-shadow);z-index:1000;border-radius:8px;width:160px;position:absolute;top:40px;right:10px;overflow:hidden}.chat-dropdown button{width:100%;color:var(--text-primary);cursor:pointer;background:0 0;border:none;align-items:center;gap:8px;padding:10px 12px;font-size:13px;display:flex}.chat-dropdown button:hover{background:var(--bg-tertiary)}.chat-dropdown .delete-opt{color:#ef4444}.collapse-btn{background:var(--accent-primary);color:#fff;cursor:pointer;z-index:10;border:none;border-radius:50%;justify-content:center;align-items:center;width:28px;height:28px;display:flex;position:absolute;top:30px;right:-14px}@media (width<=900px){.sidebar{z-index:1000;height:100vh;position:fixed;left:-280px}.sidebar.open{left:0}}@keyframes fadeIn{0%{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}.header{background:#111827;border-bottom:1px solid #1f2937;flex-shrink:0;justify-content:space-between;align-items:center;height:72px;padding:0 24px;display:flex}.header-left{align-items:center;gap:15px;display:flex}.logo-box{background:linear-gradient(135deg,#2563eb,#3b82f6);border-radius:14px;justify-content:center;align-items:center;width:48px;height:48px;font-size:24px;display:flex;box-shadow:0 8px 20px #2563eb59}.header h1{color:#fff;margin:0;font-size:20px;font-weight:700}.status{color:#94a3b8;align-items:center;gap:8px;margin-top:5px;font-size:13px;display:flex}.online-dot{background:#22c55e;border-radius:50%;width:8px;height:8px;box-shadow:0 0 8px #22c55e}.header-right{align-items:center;gap:12px;display:flex}.header-icon-btn{background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-primary);cursor:pointer;border-radius:10px;justify-content:center;align-items:center;padding:8px;transition:all .2s;display:flex}header-icon-btn:hover{background:var(--accent-primary);color:#fff;transform:translateY(-2px)}.profile{color:#fff;cursor:pointer;background:#2563eb;border-radius:50%;justify-content:center;align-items:center;width:44px;height:44px;font-size:18px;font-weight:700;transition:all .25s;display:flex}.profile:hover{transform:scale(1.05)}@media (width<=768px){.header{padding:0 14px}.header h1{font-size:17px}.status{font-size:12px}.logo-box{width:42px;height:42px;font-size:21px}.icon-btn{width:38px;height:38px}.profile{width:40px;height:40px}}@media (width<=560px){.status{display:none}.header h1{font-size:15px}.header-right{gap:8px}}.chat-window{background:var(--bg-primary);flex:1;padding:35px;overflow-y:auto}.message-row{align-items:flex-start;gap:16px;margin-bottom:32px;animation:.35s fadeUp;display:flex}.message-row.user{flex-direction:row-reverse}.avatar{background:linear-gradient(135deg, var(--accent-primary), #7c3aed);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:46px;height:46px;font-size:22px;display:flex;box-shadow:0 10px 25px #2563eb4d}.message-content{flex-direction:column;max-width:850px;display:flex}.bubble{background:var(--bg-secondary);border-radius:var(--radius-lg);color:var(--text-primary);box-shadow:var(--card-shadow);padding:18px 22px;font-size:15px;line-height:1.9;overflow-x:auto}.user .bubble{background:linear-gradient(135deg, var(--accent-primary), #3b82f6);color:#fff}.message-footer{color:var(--text-muted);align-items:center;gap:14px;margin-top:10px;font-size:12px;display:flex}.copy-btn{cursor:pointer;color:var(--accent-primary);background:0 0;border:none;align-items:center;gap:6px;font-size:13px;transition:all .25s;display:flex}.copy-btn:hover{color:var(--accent-hover)}.bubble pre{background:var(--bg-primary);border-radius:var(--radius-md);margin:15px 0;padding:16px;overflow:auto}.bubble code{font-family:Fira Code,Consolas,monospace;font-size:14px}.typing{gap:6px;padding:15px;display:flex}.typing span{background:var(--accent-primary);border-radius:50%;width:10px;height:10px;animation:1.2s infinite typing}.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}@keyframes typing{0%{opacity:.4;transform:translateY(0)}50%{opacity:1;transform:translateY(-6px)}to{opacity:.4;transform:translateY(0)}}@keyframes fadeUp{0%{opacity:0;transform:translateY(15px)}to{opacity:1;transform:translateY(0)}}.chat-window.empty-state{background-color:var(--bg-primary);justify-content:center;align-items:center;width:100%;height:100%;display:flex;overflow:hidden}.welcome-screen{text-align:center;flex-direction:column;align-items:center;width:100%;max-width:900px;padding:10px;display:flex}.welcome-header{margin-bottom:15px}.welcome-logo{background:linear-gradient(135deg, var(--accent-primary), #7c3aed);border-radius:16px;justify-content:center;align-items:center;width:60px;height:60px;margin:0 auto 10px;font-size:32px;display:flex;box-shadow:0 10px 25px #2563eb4d}.welcome-header h1{color:var(--text-primary);margin:0 0 5px;font-size:28px}.welcome-header p{color:var(--text-muted);max-width:550px;margin:0;font-size:15px;line-height:1.5}.welcome-grid{grid-template-columns:repeat(3,1fr);gap:16px;max-width:960px;margin:24px auto 0;padding:0 16px;display:grid}@media (width<=900px){.welcome-grid{grid-template-columns:repeat(2,1fr)}}@media (width<=600px){.welcome-grid{grid-template-columns:1fr}}.welcome-card{background:var(--bg-secondary,#1e293b);border:1px solid var(--border-color,#334155);text-align:left;cursor:pointer;border-radius:12px;padding:16px 18px;transition:all .2s ease-in-out}.welcome-card:hover{border-color:#6366f1;transform:translateY(-3px);box-shadow:0 8px 20px #6366f126}.welcome-card .card-icon{margin-bottom:8px;font-size:24px;display:inline-block}.welcome-card h3{color:var(--text-primary);margin:5px 0;font-size:1.1rem}.welcome-card p{color:var(--text-muted);margin:0;font-size:.8rem;line-height:1.3}@media (width<=600px){.welcome-grid{grid-template-columns:1fr}.welcome-card{min-height:auto}}.chat-input-container{background:var(--bg-primary);border-top:1px solid var(--border-color);padding:16px 20px 20px}.tone-toolbar{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:10px;display:flex}.tone-heading{color:var(--text-muted,#94a3b8);text-transform:uppercase;letter-spacing:.5px;font-size:12px;font-weight:600}.tone-pill-list{gap:6px;display:flex}.tone-pill-btn{background:var(--bg-secondary);color:var(--text-muted,#94a3b8);border:1px solid var(--border-color);cursor:pointer;border-radius:20px;align-items:center;gap:5px;padding:4px 12px;font-family:inherit;font-size:12px;transition:all .2s;display:flex}.tone-pill-btn:hover{border-color:var(--accent-primary,#3b82f6);color:var(--text-primary)}.tone-pill-btn.active-tone{background:var(--accent-primary,#3b82f6);color:#fff;border-color:var(--accent-primary,#3b82f6);font-weight:600;box-shadow:0 2px 8px #3b82f64d}.active-mode-badge{color:var(--accent-primary,#3b82f6);background:#3b82f626;border:1px solid #3b82f64d;border-radius:6px;margin-left:auto;padding:4px 10px;font-size:11px;font-weight:700}.chat-input-box{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg,12px);align-items:flex-end;gap:12px;padding:12px;transition:border-color .3s,box-shadow .3s;display:flex}.chat-input-box:focus-within{border-color:var(--accent-primary,#3b82f6);box-shadow:0 0 0 1px var(--accent-primary,#3b82f6)}.chat-input-box textarea{resize:none;color:var(--text-primary);background:0 0;border:none;outline:none;flex:1;min-height:28px;max-height:180px;font-family:inherit;font-size:15px;line-height:1.6;overflow-y:auto}.chat-input-box textarea::placeholder{color:var(--text-muted,#94a3b8)}.tool-btn{border-radius:var(--radius-md,8px);background:var(--bg-tertiary);width:42px;height:42px;color:var(--text-primary);cursor:pointer;border:none;justify-content:center;align-items:center;font-size:18px;transition:all .25s;display:flex}.tool-btn:hover{background:var(--accent-primary,#3b82f6);color:#fff}.send-btn{border-radius:var(--radius-md,8px);background:linear-gradient(135deg, var(--accent-primary,#3b82f6), #7c3aed);color:#fff;cursor:pointer;border:none;justify-content:center;align-items:center;width:46px;height:46px;font-size:18px;transition:all .25s;display:flex}.send-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #3b82f666}.send-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.input-footer{color:var(--text-muted,#94a3b8);justify-content:space-between;margin-top:10px;padding:0 5px;font-size:12px;display:flex}@media (width<=768px){.chat-input-container{padding:12px}.tone-toolbar{gap:6px}.tone-pill-btn{padding:3px 8px;font-size:11px}.active-mode-badge{display:none}.input-footer{text-align:center;flex-direction:column;gap:5px}.chat-input-box{padding:8px}}.layout{background-color:var(--bg-primary);width:100vw;height:100vh;display:flex;overflow:hidden}.main{background-color:var(--bg-primary);flex-direction:column;flex:1;display:flex;overflow:hidden}@media (width<=900px){.layout{overflow-x:hidden}}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;width:100%;height:100%;font-family:Inter,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.auth-overlay{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:9999;background:#000000bf;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.auth-card{background:var(--bg-secondary,#1e293b);border:1px solid var(--border-color,#334155);border-radius:16px;width:100%;max-width:400px;padding:28px;animation:.2s ease-out fadeIn;position:relative;box-shadow:0 20px 40px #00000080}.auth-close-btn{color:var(--text-muted,#94a3b8);cursor:pointer;background:0 0;border:none;font-size:20px;position:absolute;top:16px;right:16px}.auth-header{text-align:center;margin-bottom:20px}.auth-logo{margin-bottom:8px;font-size:36px}.auth-header h2{color:var(--text-primary,#fff);margin-bottom:4px;font-size:20px}.auth-header p{color:var(--text-muted,#94a3b8);font-size:13px}.auth-error-msg{color:#ef4444;text-align:center;background:#ef444426;border-radius:8px;margin-bottom:14px;padding:8px 12px;font-size:12px}.auth-form{flex-direction:column;gap:14px;display:flex}.auth-input-group{background:var(--bg-primary,#0f172a);border:1px solid var(--border-color,#334155);border-radius:10px;align-items:center;gap:10px;padding:10px 14px;display:flex}.auth-input-group .input-icon{color:var(--text-muted,#94a3b8);font-size:18px}.auth-input-group input{color:var(--text-primary,#fff);background:0 0;border:none;outline:none;flex:1;font-size:14px}.auth-submit-btn{color:#fff;cursor:pointer;background:linear-gradient(135deg,#3b82f6,#7c3aed);border:none;border-radius:10px;justify-content:center;align-items:center;gap:8px;padding:12px;font-size:15px;font-weight:600;transition:all .2s;display:flex}.auth-submit-btn:hover{opacity:.95;transform:translateY(-1px)}.auth-switch{text-align:center;color:var(--text-muted,#94a3b8);margin-top:18px;font-size:13px}.auth-switch button{color:#3b82f6;cursor:pointer;background:0 0;border:none;margin-left:6px;font-weight:600}.login-btn-header{color:#fff;cursor:pointer;background:#3b82f6;border:none;border-radius:8px;align-items:center;gap:6px;padding:6px 14px;font-size:13px;display:flex}.user-nav{align-items:center;gap:10px;display:flex}.user-tag{color:var(--text-primary);align-items:center;gap:5px;font-size:13px;display:flex}.logout-btn-header{border:1px solid var(--border-color);color:var(--text-muted);cursor:pointer;background:0 0;border-radius:6px;padding:6px}