:root{--primary: #2563eb;--primary-dark: #1d4ed8;--primary-light: #dbeafe;--bg: #f5f5f5;--bg-white: #ffffff;--bg-sidebar: #171717;--bg-sidebar-hover: #262626;--bg-sidebar-active: #333333;--text: #1e293b;--text-secondary: #64748b;--text-light: #94a3b8;--text-sidebar: #e5e5e5;--text-sidebar-dim: #a3a3a3;--border: #e2e8f0;--border-light: #f1f5f9;--assistant-bg: #ffffff;--user-bg: #f0f4ff;--shadow-sm: 0 1px 2px rgba(0,0,0,.05);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.1);--shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1);--radius: 12px;--radius-sm: 8px;--radius-lg: 16px;--max-width: 760px;--sidebar-width: 260px;--font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--metallic-accent: #58A6FF;--metallic-dark: #30363D;--metallic-light: #C9D1D9}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;font-family:var(--font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}#app{display:flex;height:100vh;max-height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-width);background:var(--bg-sidebar);display:flex;flex-direction:column;flex-shrink:0;transition:transform .25s ease,width .25s ease;z-index:100;overflow:hidden}.sidebar.collapsed{width:0;transform:translate(calc(var(--sidebar-width) * -1))}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:12px 12px 8px;gap:8px}.new-chat-btn{display:flex;align-items:center;gap:8px;padding:8px 14px;border:1px solid rgba(255,255,255,.15);border-radius:var(--radius-sm);background:transparent;color:var(--text-sidebar);font-family:var(--font);font-size:13px;font-weight:500;cursor:pointer;transition:background 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rgba(255,255,255,.08);padding:8px;display:flex;flex-direction:column;gap:2px}.sidebar-footer-btn{display:flex;align-items:center;gap:10px;padding:10px 12px;border:none;border-radius:var(--radius-sm);background:transparent;color:var(--text-sidebar);font-family:var(--font);font-size:13px;cursor:pointer;transition:background .12s;width:100%;text-align:left}.sidebar-footer-btn:hover{background:var(--bg-sidebar-hover)}.sidebar-footer-btn.upgrade-btn{color:var(--metallic-accent)}.main-wrapper{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--bg)}.topbar{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;background:var(--bg);flex-shrink:0;min-height:48px}.topbar-left,.topbar-brand{display:flex;align-items:center;gap:8px}.topbar-logo{width:28px;height:28px}.topbar-title{font-size:16px;font-weight:600;color:var(--text)}.topbar-right{display:flex;align-items:center;gap:8px}.topbar-btn{padding:6px 14px;border:1px solid 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svg{color:var(--primary)}.welcome-chip-highlight{background:linear-gradient(135deg,#eff6ff,#dbeafe);border-color:var(--primary);color:var(--primary-dark);font-weight:600;box-shadow:0 0 0 1px #2563eb1f,var(--shadow-sm)}.welcome-chip-highlight svg{color:var(--primary)}.welcome-chip-highlight:hover{background:linear-gradient(135deg,#dbeafe,#bfdbfe);border-color:var(--primary-dark);box-shadow:0 0 0 2px #2563eb26,var(--shadow-md)}.signup-method-toggle{display:flex;gap:8px;margin-bottom:16px;background:var(--bg);border-radius:var(--radius-sm);padding:4px}.signup-method-btn{flex:1;padding:8px 12px;border:none;background:transparent;border-radius:6px;font-size:.85rem;color:var(--text-secondary);cursor:pointer;transition:all 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16px;scroll-behavior:smooth}.messages::-webkit-scrollbar{width:6px}.messages::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.message{max-width:var(--max-width);margin:0 auto 24px;width:100%;animation:msgFadeIn .3s ease-out}@keyframes msgFadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.message-header{display:flex;align-items:center;gap:8px;margin-bottom:8px}.message-avatar{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0}.message-avatar img{width:100%;height:100%;border-radius:50%}.message-avatar.user-avatar{background:linear-gradient(135deg,var(--metallic-accent),var(--primary));color:#fff;font-size:12px;font-weight:600}.message-role{font-size:13px;font-weight:600;color:var(--text)}.message-body{padding-left:36px;line-height:1.65;font-size:15px;color:var(--text)}.message-actions{display:flex;gap:4px;margin-top:8px;padding-left:36px;opacity:0;transition:opacity 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a{color:var(--primary);text-decoration:none}.consent-actions{display:flex;gap:8px;flex-shrink:0}.consent-btn{padding:6px 14px;border:1px solid var(--border);border-radius:20px;background:#fff;color:var(--text-secondary);font-size:13px;font-family:var(--font);cursor:pointer;transition:all .15s}.consent-btn-accept{background:var(--primary);color:#fff;border-color:var(--primary)}.consent-btn-accept:hover{background:var(--primary-dark)}.message-body code{background:#0000000f;padding:2px 6px;border-radius:4px;font-size:13px}.message-body pre{background:#1e293b;color:#e2e8f0;padding:12px;border-radius:var(--radius-sm);overflow-x:auto;margin:8px 0}.message-body pre code{background:transparent;padding:0;color:inherit}.message-body a{color:var(--primary);text-decoration:none}.message-body a:hover{text-decoration:underline}.message-body blockquote{border-left:3px solid var(--primary);padding-left:12px;margin:8px 0;color:var(--text-secondary)}.message-body p{margin-bottom:10px}.message-body p:last-child{margin-bottom:0}.message-body strong{font-weight:600}.message-body ul,.message-body ol{margin:8px 0;padding-left:20px}.message-body li{margin-bottom:4px}.message-body h3{font-size:16px;font-weight:600;margin:16px 0 8px}.message-body h4{font-size:15px;font-weight:600;margin:12px 0 6px}.message-body hr{border:none;border-top:1px solid var(--border);margin:12px 0}.message-body table{width:100%;border-collapse:collapse;margin:8px 0;font-size:14px}.message-body th,.message-body td{padding:6px 10px;text-align:left;border:1px solid var(--border)}.message-body th{background:var(--bg);font-weight:600}html,body{overflow-x:hidden}@media (max-width: 768px){.sidebar{position:fixed;top:0;left:0;bottom:0;z-index:200;box-shadow:var(--shadow-lg);width:280px}.sidebar.collapsed{transform:translate(-100%);width:280px}.main-wrapper .sidebar-toggle-btn{display:flex!important}.plans-grid{grid-template-columns:1fr}.modal-upgrade{max-width:420px}.welcome-chips{flex-direction:column;align-items:center}.topbar-brand .topbar-title{display:none}.messages{padding:12px 8px}.message{margin-bottom:16px}.message-body,.message-actions,.feedback-row{padding-left:0}.engine-badge{margin-left:0}.sources,.typing-indicator{padding-left:0}.message-body table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;white-space:nowrap;max-width:100%}.message-body pre{max-width:100%;overflow-x:auto}.input-area{padding:6px 10px 12px}.input-wrapper{padding:8px 10px}.engine-toggle-row{flex-wrap:wrap;gap:6px}.engine-hint{display:none}.modal{padding:24px 18px;margin:8px;max-width:calc(100vw - 16px)}.modal-settings{max-width:calc(100vw - 16px)}.modal-upgrade{max-width:calc(100vw - 16px);padding:24px 16px}.welcome-screen{padding:24px 16px}.welcome-greeting{font-size:24px}.welcome-sub{font-size:14px;margin-bottom:24px}.welcome-logo{width:48px;height:48px}.consent-banner{flex-direction:column;gap:10px;padding:12px 16px;text-align:center}.settings-toggle-row{gap:10px}}@media (max-width: 480px){.welcome-greeting{font-size:20px}.welcome-sub{font-size:13px}.welcome-chip{font-size:13px;padding:8px 14px}.topbar{padding:6px 10px}.topbar-btn{padding:5px 10px;font-size:12px}.message-body{font-size:14px;line-height:1.6}.message-body h3{font-size:15px}.message-body h4{font-size:14px}.message-body table{font-size:12px}.message-body th,.message-body td{padding:4px 6px}.plan-card{padding:18px 14px}.plan-price{font-size:26px}.plan-features li{font-size:12px}.footer-note{font-size:10px}}.splash-content{max-width:560px;text-align:center}.splash-logo{width:80px;height:80px;filter:drop-shadow(0 2px 12px rgba(37,99,235,.25))}.splash-title{font-size:52px;font-weight:800;color:var(--text);margin:14px 0 6px;letter-spacing:-1.5px;background:linear-gradient(135deg,#1e293b,#2563eb);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.splash-tagline{font-size:18px;color:var(--text-secondary);margin-bottom:20px;font-weight:400}.splash-divider{width:60px;height:3px;background:linear-gradient(90deg,var(--primary),#60a5fa);border-radius:2px;margin:0 auto 20px}.splash-badge{display:inline-flex;align-items:center;gap:6px;background:var(--primary-light);border:1px solid rgba(37,99,235,.2);color:var(--primary);font-size:13px;font-weight:600;padding:6px 16px;border-radius:20px;margin-bottom:20px;letter-spacing:.5px;text-transform:uppercase}.splash-desc{font-size:15px;color:var(--text-secondary);line-height:1.7;margin-bottom:24px}.splash-features{display:flex;flex-direction:column;gap:12px;text-align:left;margin-bottom:32px}.splash-feature{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text)}.splash-feature svg{flex-shrink:0}.splash-actions{display:flex;gap:12px;justify-content:center;margin-bottom:24px}.splash-btn{padding:12px 28px;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;transition:all .2s;border:none}.splash-btn-primary{background:var(--primary);color:#fff}.splash-btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 4px 16px #2563eb59}.splash-btn-secondary{background:transparent;color:var(--text);border:1px solid var(--border)}.splash-btn-secondary:hover{border-color:var(--primary);color:var(--primary)}.splash-learn-more{margin-bottom:16px}.splash-learn-more a{color:var(--primary);text-decoration:none;font-size:14px;font-weight:500;transition:color .2s}.splash-learn-more a:hover{color:var(--primary-dark);text-decoration:underline}.splash-footer-note{font-size:12px;color:var(--text-light)}.splash-footer-note a{color:var(--text-light);text-decoration:none}.splash-footer-note a:hover,.splash-footer-note strong{color:var(--text-secondary)}.invite-code-input-row{display:flex;align-items:center;gap:8px}.invite-code-input-row input{flex:1}.invite-code-status{font-size:13px;font-weight:500;white-space:nowrap;min-width:80px;text-align:right}.invite-code-status.checking{color:#8b949e}.invite-code-status.valid{color:#3fb950}.invite-code-status.invalid{color:#f85149}.invite-welcome{background:#58a6ff14;border:1px solid rgba(88,166,255,.2);border-radius:8px;padding:10px 14px;margin-bottom:16px;font-size:13px;color:#58a6ff}.welcome-invite-note{font-size:13px;color:#8b949e;margin-top:12px}.welcome-invite-note a{color:#58a6ff;text-decoration:none}.welcome-invite-note a:hover{text-decoration:underline}.invite-balance-display{display:flex;align-items:baseline;gap:8px;margin:8px 0}.invite-balance-count{font-size:36px;font-weight:700;color:#58a6ff;line-height:1}.invite-balance-label{font-size:14px;color:#8b949e}.invite-send-row{display:flex;gap:8px;align-items:flex-start}.invite-send-row input{flex:1;min-width:0;width:auto}.invite-send-row .form-btn{width:auto;flex-shrink:0;padding:10px 20px}.invites-list{display:flex;flex-direction:column;gap:8px}.invite-item{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:var(--bg-secondary, #161B22);border:1px solid var(--border, #30363D);border-radius:8px;font-size:13px}.invite-item-info{display:flex;flex-direction:column;gap:2px}.invite-item-email{color:#c9d1d9;font-weight:500}.invite-item-code{color:#8b949e;font-size:11px;font-family:monospace}.invite-item-right{display:flex;align-items:center;gap:10px}.invite-status{font-size:12px;font-weight:500;padding:2px 8px;border-radius:12px}.invite-status-accepted{background:#3fb95026;color:#3fb950}.invite-status-pending{background:#58a6ff26;color:#58a6ff}.invite-status-expired{background:#8b949e26;color:#8b949e}.invite-copy-link{background:none;border:1px solid #30363D;color:#58a6ff;font-size:12px;padding:4px 10px;border-radius:6px;cursor:pointer;transition:all .15s}.invite-copy-link:hover{background:#58a6ff1a;border-color:#58a6ff}.invite-delete-btn{background:none;border:1px solid transparent;color:#8b949e;font-size:14px;padding:2px 6px;border-radius:4px;cursor:pointer;transition:all .15s;line-height:1}.invite-delete-btn:hover{color:#f85149;border-color:#f85149;background:#f851491a}@supports (padding: env(safe-area-inset-bottom)){.input-area{padding-bottom:calc(12px + env(safe-area-inset-bottom))}.sidebar{padding-top:env(safe-area-inset-top)}.consent-banner{padding-bottom:calc(12px + env(safe-area-inset-bottom))}}