:root{--primary:#543f9e;--primary-variant:#3c2d6e;--secondary:#ebe8f1;--accent:#3772e7;--background:#f8f9fa;--surface:#fff;--surface-soft:#f1f5f9;--text-primary:#1f2937;--text-secondary:#6b7280;--text-hint:#9ca3af;--divider:#e5e7eb;--error:#ef4444;--success:#10b981;--warning:#f59e0b;--shadow:#543f9e29}*{box-sizing:border-box}html,body{min-height:100%;margin:0}body{background:var(--background);color:var(--text-primary);font-family:Outfit,Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,textarea,select{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed}.sisu-root{--root-background:var(--background);--root-surface:var(--surface);--root-surface-soft:var(--surface-soft);--root-text:var(--text-primary);--root-muted:var(--text-secondary);--root-hint:var(--text-hint);--root-divider:var(--divider);--root-shadow:var(--shadow);background:linear-gradient(135deg, #ebe8f1c7, #f8f9fae0 42%, #3772e714), var(--root-background);min-height:100svh;color:var(--root-text)}.sisu-root.is-dark{--primary:#6d5bd0;--primary-variant:#4f46a6;--accent:#3772e7;--root-background:#070b14;--root-surface:#0f172a;--root-surface-soft:#111827;--root-text:#f8fafc;--root-muted:#cbd5e1;--root-hint:#9ca3af;--root-divider:#94a3b82e;--root-shadow:#00000057;background:radial-gradient(circle at 14% 8%, #10b9811f, transparent 30%), radial-gradient(circle at 88% 18%, #3772e721, transparent 28%), linear-gradient(135deg, #070b14, #101827 48%, #0d211d), var(--root-background)}.loading-screen{align-content:center;place-items:center;gap:18px;min-height:100svh;display:grid}.loading-mark{color:#fff;background:linear-gradient(135deg, var(--primary), var(--accent));border-radius:24px;place-items:center;width:72px;height:72px;display:grid;box-shadow:0 18px 50px #543f9e47}.loading-bar{background:#543f9e29;border-radius:999px;width:160px;height:6px;overflow:hidden}.loading-bar:after{content:"";border-radius:inherit;background:linear-gradient(90deg, var(--primary), var(--accent));width:42%;height:100%;animation:1.1s ease-in-out infinite loading-slide;display:block}@keyframes loading-slide{0%{transform:translate(-110%)}to{transform:translate(250%)}}.auth-page{place-items:center;min-height:100svh;padding:36px 22px;display:grid;position:relative;overflow:hidden}.auth-page:before{content:"";opacity:.22;background-image:linear-gradient(#543f9e29 1px,#0000 1px),linear-gradient(90deg,#3772e724 1px,#0000 1px);background-size:42px 42px;position:absolute;inset:0;-webkit-mask-image:linear-gradient(#0000,#000 18% 84%,#0000);mask-image:linear-gradient(#0000,#000 18% 84%,#0000)}.auth-grid{z-index:1;grid-template-columns:1.05fr .95fr;align-items:center;gap:28px;width:min(1120px,100%);min-width:0;display:grid;position:relative}.auth-brand{flex-direction:column;justify-content:center;width:100%;min-width:0;min-height:650px;padding:32px;display:flex}.auth-logo{object-fit:contain;filter:drop-shadow(0 22px 42px #543f9e24);width:min(330px,72vw);height:auto;margin:0 0 20px -18px}.auth-mark{color:#fff;background:linear-gradient(135deg, var(--primary), var(--accent));border-radius:999px;place-items:center;width:100px;height:100px;margin-bottom:30px;display:grid;box-shadow:0 22px 70px #543f9e47,0 10px 30px #3772e72e}.auth-brand h1{overflow-wrap:break-word;width:100%;max-width:520px;color:var(--root-text);margin:0;font-size:clamp(2.4rem,5vw,4.7rem);font-weight:800;line-height:1.04}.auth-brand p{overflow-wrap:break-word;width:100%;max-width:520px;color:var(--root-muted);margin:18px 0 0;font-size:1.08rem;line-height:1.65}.feature-strip{flex-wrap:wrap;gap:14px;margin-top:34px;display:flex}.feature-strip div{border:1px solid color-mix(in srgb, var(--primary) 14%, transparent);min-width:0;min-height:44px;color:var(--root-muted);background:color-mix(in srgb, var(--root-surface) 76%, transparent);border-radius:16px;align-items:center;gap:9px;padding:10px 14px;display:inline-flex;box-shadow:0 12px 28px #1f29370a}.feature-strip svg{color:var(--primary);flex:none}.feature-strip span{overflow-wrap:break-word;min-width:0}.auth-card{border:1px solid color-mix(in srgb, var(--root-divider) 74%, transparent);background:color-mix(in srgb, var(--root-surface) 88%, transparent);width:100%;min-width:0;min-height:560px;box-shadow:0 30px 80px var(--root-shadow);-webkit-backdrop-filter:blur(22px);backdrop-filter:blur(22px);border-radius:30px;padding:28px}.auth-form{flex-direction:column;justify-content:center;height:100%;min-height:500px;display:flex}.form-heading{margin-bottom:30px}.form-heading.center{text-align:center}.form-heading h2{margin:0;font-size:2rem;line-height:1.16}.form-heading p{color:var(--root-muted);margin:10px 0 0;line-height:1.5}.field-label{margin:0 0 9px 4px;font-size:.95rem;font-weight:700;display:block}.phone-field{border:1.5px solid var(--root-divider);background:var(--root-surface);border-radius:20px;align-items:center;gap:12px;height:62px;padding:0 18px;transition:border-color .18s,box-shadow .18s;display:flex;box-shadow:0 12px 26px #1f29370f}.phone-field:focus-within{border-color:var(--primary);box-shadow:0 0 0 4px #543f9e1f}.phone-field svg{color:var(--primary)}.phone-field input{width:100%;color:var(--root-text);background:0 0;border:0;outline:0;font-size:1.05rem;font-weight:700}.phone-field input::placeholder{color:var(--root-hint)}.form-error{min-height:22px;color:var(--error);margin:10px 4px 0;font-size:.9rem;font-weight:700}.center-text{text-align:center}.primary-action{color:#fff;background:linear-gradient(135deg, var(--primary), var(--accent));border:0;border-radius:20px;justify-content:center;align-items:center;gap:10px;width:100%;height:60px;margin-top:22px;font-size:1.04rem;font-weight:800;display:inline-flex;box-shadow:0 18px 36px #543f9e47}.primary-action:disabled{opacity:.78}.spinner{border:3px solid #ffffff57;border-top-color:#fff;border-radius:999px;width:24px;height:24px;animation:.8s linear infinite spin}.spinner.light{width:34px;height:34px}.mini-spinner{border:2px solid color-mix(in srgb, var(--error) 30%, transparent);border-top-color:var(--error);border-radius:999px;width:16px;height:16px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.trust-row{color:var(--root-hint);flex-wrap:wrap;justify-content:center;gap:12px;margin-top:26px;font-size:.82rem;font-weight:700;display:flex}.trust-row span,.security-badge,.phone-pill,.resend-row{align-items:center;gap:7px;display:inline-flex}.pricing-note{max-width:330px;color:var(--root-hint);text-align:center;margin:22px auto 0;font-size:.78rem;line-height:1.45}.ghost-back{color:var(--root-muted);background:0 0;border:0;align-self:flex-start;align-items:center;gap:8px;margin-bottom:22px;font-weight:700;display:inline-flex}.pin-icon{color:#fff;background:linear-gradient(135deg, var(--primary), var(--accent));border-radius:999px;align-self:center;place-items:center;width:96px;height:96px;margin-bottom:28px;display:grid;box-shadow:0 22px 48px #543f9e47}.phone-pill{width:fit-content;color:var(--root-text);background:color-mix(in srgb, var(--root-text) 5%, transparent);border-radius:999px;margin-top:14px;padding:9px 16px;font-weight:800}.pin-input{width:min(340px,100%);height:74px;color:var(--root-text);background:color-mix(in srgb, var(--root-text) 4%, transparent);text-align:center;letter-spacing:.58em;text-indent:.58em;border:2px solid #0000;border-radius:18px;outline:0;align-self:center;font-size:2rem;font-weight:800}.pin-input:focus{border-color:var(--primary);box-shadow:0 0 0 4px #543f9e1f}.pin-input.has-error{border-color:var(--error)}.resend-row{color:var(--root-muted);justify-content:center;gap:8px;margin-top:20px;font-size:.92rem}.resend-row button{color:var(--primary);background:0 0;border:0;padding:0;font-weight:800}.security-badge{border:1px solid color-mix(in srgb, var(--success) 18%, transparent);color:var(--root-hint);background:color-mix(in srgb, var(--success) 7%, transparent);border-radius:999px;align-self:center;margin-top:26px;padding:10px 15px;font-size:.82rem;font-weight:800}.security-badge svg{color:var(--success)}.workspace-shell{grid-template-columns:318px minmax(0,1fr);height:100svh;display:grid;position:relative;overflow:hidden}.chat-sidebar{border-right:1px solid var(--root-divider);background:color-mix(in srgb, var(--root-surface) 91%, transparent);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);flex-direction:column;height:100svh;display:flex}.sidebar-header{justify-content:space-between;align-items:center;padding:18px 16px 12px;display:flex}.brand-button{min-width:0;color:var(--root-text);background:0 0;border:0;align-items:center;gap:10px;font-size:1.08rem;font-weight:900;display:inline-flex}.brand-button img{object-fit:contain;width:42px;height:42px}.new-chat-button,.clear-history,.unsubscribe-button,.settings-button{border:1px solid color-mix(in srgb, var(--primary) 22%, transparent);min-height:44px;color:var(--primary);background:color-mix(in srgb, var(--primary) 9%, transparent);border-radius:14px;align-items:center;gap:9px;margin:8px 16px;padding:0 14px;font-weight:800;display:flex}.search-box{border:1px solid var(--root-divider);min-height:42px;color:var(--root-hint);background:color-mix(in srgb, var(--root-text) 4%, transparent);border-radius:14px;align-items:center;gap:10px;margin:8px 16px 14px;padding:0 12px;display:flex}.search-box input{min-width:0;color:var(--root-text);background:0 0;border:0;outline:0;flex:1}.search-box input::placeholder{color:var(--root-hint)}.history-list{flex:1;padding:0 10px 18px;overflow:auto}.history-group{margin-bottom:18px}.history-group-title{color:var(--root-hint);text-transform:uppercase;justify-content:space-between;padding:8px;font-size:.75rem;font-weight:900;display:flex}.history-item{width:100%;min-height:58px;color:var(--root-text);text-align:left;background:0 0;border:1px solid #0000;border-radius:14px;grid-template-columns:34px minmax(0,1fr) auto;align-items:center;gap:10px;margin-bottom:5px;padding:9px 8px;display:grid;position:relative}.history-item:hover,.history-item.is-active{border-color:color-mix(in srgb, var(--primary) 16%, transparent);background:color-mix(in srgb, var(--primary) 8%, transparent)}.history-icon{width:34px;height:34px;color:var(--tutor-color);background:color-mix(in srgb, var(--tutor-color) 14%, transparent);border-radius:12px;place-items:center;display:grid}.history-copy{gap:3px;min-width:0;display:grid}.history-copy span,.history-copy small{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.history-copy span{font-size:.92rem;font-weight:800}.history-copy small{color:var(--root-muted);font-size:.76rem}.history-actions{opacity:0;gap:2px;transition:opacity .16s;display:inline-flex}.history-item:hover .history-actions,.history-item.is-active .history-actions{opacity:1}.history-actions button{width:28px;height:28px;color:var(--root-muted);background:0 0;border:0;border-radius:9px;place-items:center;display:grid}.history-actions button:hover{color:var(--primary);background:color-mix(in srgb, var(--primary) 12%, transparent)}.sidebar-footer{border-top:1px solid var(--root-divider);padding:10px 16px 16px}.settings-button{justify-content:center;width:100%;margin:0}.settings-panel{border:1px solid var(--root-divider);background:color-mix(in srgb, var(--root-text) 3%, transparent);border-radius:18px;gap:10px;margin-top:12px;padding:10px;display:grid}.clear-history{width:100%;color:var(--root-muted);border-color:var(--root-divider);background:0 0;justify-content:center;margin:0}.unsubscribe-button{width:100%;color:var(--error);border-color:color-mix(in srgb, var(--error) 24%, transparent);background:color-mix(in srgb, var(--error) 8%, transparent);justify-content:center;margin:0}.unsubscribe-button:disabled{opacity:.7}.user-chip{border:1px solid var(--root-divider);background:color-mix(in srgb, var(--root-text) 4%, transparent);border-radius:16px;grid-template-columns:38px minmax(0,1fr) 34px;align-items:center;gap:10px;min-height:58px;padding:10px;display:grid}.user-chip>span,.user-chip button{width:34px;height:34px;color:var(--primary);background:color-mix(in srgb, var(--primary) 10%, transparent);border-radius:12px;place-items:center;display:grid}.user-chip strong,.user-chip small{text-overflow:ellipsis;white-space:nowrap;display:block;overflow:hidden}.user-chip strong{font-size:.86rem}.user-chip small{color:var(--root-muted);font-size:.74rem}.user-chip button{border:0}.chat-main{flex-direction:column;min-width:0;height:100svh;display:flex}.chat-topbar{border-bottom:1px solid var(--root-divider);background:color-mix(in srgb, var(--root-surface) 82%, transparent);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);align-items:center;gap:12px;min-height:74px;padding:12px 18px;display:flex}.icon-button{border:1px solid var(--root-divider);width:42px;height:42px;color:var(--root-muted);background:color-mix(in srgb, var(--root-text) 4%, transparent);border-radius:14px;flex:none;place-items:center;display:grid}.mobile-only{display:none}.active-tutor{flex:1;align-items:center;gap:12px;min-width:0;display:flex}.active-tutor h2{margin:0;font-size:1.05rem;line-height:1.2}.active-tutor span{color:var(--root-muted);align-items:center;gap:6px;font-size:.8rem;font-weight:700;display:inline-flex}.active-tutor i{background:var(--success);border-radius:999px;width:8px;height:8px;box-shadow:0 0 0 4px #10b98124}.tutor-avatar{color:#fff;background:linear-gradient(135deg, var(--gradient-start), var(--gradient-end));width:36px;height:36px;box-shadow:0 12px 24px color-mix(in srgb, var(--gradient-start) 25%, transparent);border-radius:13px;flex:none;place-items:center;display:grid}.active-tutor .tutor-avatar{display:grid}.tutor-avatar.is-large{border-radius:15px;width:46px;height:46px}.tutor-avatar svg{display:block}.tutor-avatar.is-zap svg{transform:translate(1px,.5px)}.topbar-controls{align-items:center;gap:9px;min-width:0;display:flex}.topbar-controls select{border:1px solid var(--root-divider);max-width:210px;height:42px;color:var(--root-text);background:var(--root-surface);border-radius:14px;outline:0;padding:0 12px;font-weight:800}.topbar-controls select:first-child{width:210px}.mode-toggle{border:1px solid var(--root-divider);background:color-mix(in srgb, var(--root-text) 4%, transparent);border-radius:14px;gap:4px;padding:4px;display:inline-flex}.mode-toggle button{height:32px;color:var(--root-muted);background:0 0;border:0;border-radius:10px;align-items:center;gap:5px;padding:0 10px;font-size:.78rem;font-weight:900;display:inline-flex}.mode-toggle button.is-active{color:var(--root-text);background:var(--root-surface);box-shadow:0 8px 18px #1f293714}.message-scroll{flex:1;padding:26px 18px 18px;overflow-y:auto}.message-stack{width:min(920px,100%);margin:0 auto}.message-row{align-items:flex-start;gap:12px;margin-bottom:22px;display:flex}.message-row.is-user{justify-content:flex-end;align-items:flex-end}.message-content{max-width:min(760px,82%)}.message-row.is-user .message-content{justify-items:end;display:grid}.message-bubble{border:1px solid var(--root-divider);color:var(--root-text);background:var(--root-surface);border-radius:22px 22px 22px 8px;padding:18px 20px;position:relative;overflow:hidden;box-shadow:0 14px 30px #1f293712}.message-row.is-assistant .tutor-avatar{margin-top:6px}.message-row.is-assistant .message-bubble{border-color:color-mix(in srgb, var(--primary) 17%, var(--root-divider));background:linear-gradient(180deg, color-mix(in srgb, var(--root-surface) 96%, var(--primary) 4%), var(--root-surface))}.message-row.is-assistant .message-bubble:before{content:"";background:linear-gradient(180deg, var(--primary), var(--accent));border-radius:999px;width:3px;position:absolute;top:18px;bottom:18px;left:0}.message-row.is-user .message-bubble{color:#fff;background:linear-gradient(135deg, var(--gradient-start), var(--gradient-end));box-shadow:0 12px 24px color-mix(in srgb, var(--gradient-start) 24%, transparent);border:0;border-radius:22px 22px 8px}.message-bubble p{white-space:pre-wrap;margin:0 0 12px;font-size:.98rem;font-weight:500;line-height:1.72}.message-bubble p:last-child{margin-bottom:0}.message-bubble p.is-blank-line{height:6px;margin:0}.message-meta{color:var(--root-hint);flex-wrap:wrap;align-items:center;gap:10px;margin-top:8px;padding-left:4px;font-size:.75rem;display:flex}.message-row.is-user .message-meta{justify-content:flex-end}.message-meta span,.message-meta button{align-items:center;gap:4px;display:inline-flex}.message-meta button{color:var(--root-hint);background:0 0;border:0;font-weight:800}.message-meta button:hover{color:var(--primary)}.typing-bubble{border:1px solid var(--root-divider);background:var(--root-surface);border-radius:20px 20px 20px 7px;align-items:center;gap:5px;padding:16px 18px;display:inline-flex;box-shadow:0 10px 22px #1f29370f}.typing-bubble span{background:var(--primary);border-radius:999px;width:8px;height:8px;animation:1s ease-in-out infinite typing-dot}.typing-bubble span:nth-child(2){animation-delay:.14s}.typing-bubble span:nth-child(3){animation-delay:.28s}@keyframes typing-dot{0%,70%,to{opacity:.42;transform:translateY(0)}35%{opacity:1;transform:translateY(-5px)}}.composer-wrap{border-top:1px solid var(--root-divider);background:color-mix(in srgb, var(--root-surface) 88%, transparent);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);padding:10px 18px 18px}.suggestion-row{gap:8px;width:min(920px,100%);margin:0 auto 10px;padding-bottom:2px;display:flex;overflow-x:auto}.suggestion-row button{border:1px solid color-mix(in srgb, var(--tutor-color) 22%, transparent);max-width:320px;min-height:36px;color:var(--tutor-color);background:color-mix(in srgb, var(--tutor-color) 9%, transparent);border-radius:999px;flex:none;align-items:center;gap:6px;padding:0 13px;font-size:.82rem;font-weight:800;display:inline-flex}.composer{border:1px solid var(--root-divider);background:var(--root-surface);border-radius:24px;grid-template-columns:46px minmax(0,1fr) 72px 50px;align-items:end;gap:9px;width:min(920px,100%);min-height:64px;margin:0 auto;padding:9px;display:grid;position:relative;box-shadow:0 18px 40px #1f293714}.attach-button,.send-button{border:0;border-radius:16px;place-items:center;width:46px;height:46px;display:grid}.attach-button{color:var(--root-muted);background:color-mix(in srgb, var(--root-text) 5%, transparent)}.composer textarea{resize:none;width:100%;max-height:120px;color:var(--root-text);background:0 0;border:0;outline:0;padding:13px 0;line-height:1.45}.composer textarea::placeholder{color:var(--root-hint)}.char-count{color:var(--root-hint);text-align:right;align-self:center;font-size:.72rem;font-weight:800}.send-button{color:#fff;background:linear-gradient(135deg, var(--gradient-start), var(--gradient-end));box-shadow:0 12px 22px color-mix(in srgb, var(--gradient-start) 28%, transparent)}.send-button:disabled{opacity:.42;box-shadow:none}.toast{z-index:50;color:#fff;text-align:center;background:#1f2937;border-radius:14px;max-width:min(420px,100vw - 32px);padding:12px 16px;font-weight:800;position:fixed;bottom:24px;left:50%;transform:translate(-50%);box-shadow:0 16px 36px #0000003d}.sisu-root.is-dark .chat-sidebar{background:linear-gradient(#090e19,#111827 62%,#131f2d);border-right-color:#94a3b829;box-shadow:0 22px 70px #00000057}.sisu-root.is-dark .chat-main{background:radial-gradient(circle at 58% 8%,#3772e714,#0000 34%),linear-gradient(135deg,#0f172ab8,#111827e0 48%,#0d211d80)}.sisu-root.is-dark .chat-topbar,.sisu-root.is-dark .composer-wrap{background:#0f172ae0;border-color:#94a3b829;box-shadow:0 18px 60px #0000002e}.sisu-root.is-dark .new-chat-button,.sisu-root.is-dark .settings-button{color:#c4b5fd;background:#6d5bd029;border-color:#c4b5fd33}.sisu-root.is-dark .search-box,.sisu-root.is-dark .settings-panel,.sisu-root.is-dark .user-chip,.sisu-root.is-dark .icon-button,.sisu-root.is-dark .mode-toggle,.sisu-root.is-dark .topbar-controls select,.sisu-root.is-dark .composer{background:#02061780;border-color:#94a3b833}.sisu-root.is-dark .topbar-controls select,.sisu-root.is-dark .mode-toggle button.is-active{color:#f8fafc;background-color:#0f172af0}.sisu-root.is-dark .history-item:hover,.sisu-root.is-dark .history-item.is-active{background:#6d5bd029;border-color:#c4b5fd33}.sisu-root.is-dark .history-icon,.sisu-root.is-dark .user-chip>span,.sisu-root.is-dark .user-chip button{color:#93c5fd;background:#3b82f624}.sisu-root.is-dark .message-bubble,.sisu-root.is-dark .typing-bubble{background:#0f172ae6;border-color:#94a3b833;box-shadow:0 18px 54px #00000038}.sisu-root.is-dark .message-row.is-assistant .message-bubble{background:linear-gradient(#111827f5,#0f172af5);border-color:#c4b5fd38}.sisu-root.is-dark .message-row.is-assistant .message-bubble:before{background:linear-gradient(#34d399,#60a5fa 58%,#a78bfa)}.sisu-root.is-dark .suggestion-row button{color:#60a5fa;background:#3772e71f;border-color:#3772e752}.sisu-root.is-dark .attach-button{color:#cbd5e1;background:#94a3b821}.sisu-root.is-dark .send-button,.sisu-root.is-dark .tutor-avatar{box-shadow:0 16px 34px #3772e73d}.sidebar-scrim{display:none}.admin-root{color:#152033;background:radial-gradient(circle at 14% 8%,#10b98124,#0000 30%),radial-gradient(circle at 88% 18%,#3772e721,#0000 28%),linear-gradient(135deg,#f8fafc,#eef2ff 46%,#ecfeff);min-height:100svh;padding:18px}.admin-login-root{place-items:center;display:grid}.admin-loading{color:#475569;align-content:center;place-items:center;gap:14px;min-height:calc(100svh - 36px);font-weight:800;display:grid}.admin-login-panel{-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffffe0;border:1px solid #94a3b83d;border-radius:24px;gap:24px;width:min(470px,100%);padding:34px;display:grid;box-shadow:0 24px 90px 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