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.btn{color:var(--paper);border-color:#ffffff30}.app-main{min-width:0}.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:0 30px;border-bottom:1px solid var(--line);background:var(--paper-2)}.topbar-title{font:600 18px var(--display)}.topbar-search{margin-left:auto;max-width:250px}.topbar-search input{width:100%;min-height:38px;padding:8px 12px;font-size:12px}.avatar{width:34px;height:34px;background:var(--note);border:1px solid var(--gold);border-radius:50%;display:grid;place-items:center;font:600 16px var(--display);flex-shrink:0}.content{padding:30px;max-width:1500px;margin:auto}.menu-toggle{display:none;padding:8px;min-height:44px;min-width:44px;border:1px solid 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var(--display);font-variant-numeric:tabular-nums;line-height:1.2;margin:35px 0}.tutor-grid{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:20px}.chat-box{height:min(660px,calc(100dvh - 210px));min-height:400px;padding:0;display:flex;flex-direction:column;overflow:hidden}.chat-head{padding:18px 22px;border-bottom:1px solid var(--line)}.chat-log{flex:1;overflow:auto;padding:24px;display:flex;flex-direction:column;gap:18px}.msg{max-width:88%;padding:14px 18px;border-radius:10px;background:var(--paper-3);align-self:flex-start;white-space:pre-wrap;overflow-wrap:anywhere;font-size:13px;line-height:1.8}.msg.user{align-self:flex-end;background:var(--navy);color:var(--paper-2)}.chat-compose{display:flex;gap:10px;padding:16px;border-top:1px solid var(--line)}.chat-compose textarea{min-height:46px;height:48px;max-height:140px}.suggestion{display:block;width:100%;text-align:left;margin-top:10px;padding:12px;background:var(--paper-2);border:1px solid 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var(--gold)}.price-card h3{font:600 26px var(--display);margin:12px 0}.price-card .price{font:500 48px var(--display);margin:20px 0 6px}.price-card .price small{font:12px var(--body)}.price-card ul{padding:0;list-style:none;margin:20px 0 26px;flex:1}.price-card li{padding:8px 0;border-bottom:1px solid var(--line);font-size:12px}.price-card .btn{width:100%}.pricing-footnote{text-align:center;margin-top:26px;font-size:12px;color:var(--ink-soft)}.pricing-section a{font-family:var(--body)}.scroll-table{overflow-x:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:12px}td,th{padding:14px 10px;border-bottom:1px solid var(--line)}th{font:500 10px var(--mono);text-transform:uppercase}details>summary{cursor:pointer;font-weight:600;padding:12px 0}details .document{font-size:13px}.filter-input{max-width:400px;margin-bottom:20px}.error-title{font-family:var(--body);font-size:15px}.achievement-locked{opacity:.65}
@media(min-width:1500px){.content{padding:38px 44px}.auth-brand{padding:70px}}
@media(max-width:1100px){.app{grid-template-columns:210px minmax(0,1fr)}.content{padding:24px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tutor-grid{grid-template-columns:minmax(0,1fr)}.tutor-context{display:grid;grid-template-columns:1fr 1fr;gap:16px}.split{grid-template-columns:minmax(0,1fr)}.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.auth-brand{padding:36px}}
@media(max-width:820px){.app{display:block}.sidebar{position:fixed;left:0;width:260px;transform:translateX(-100%)}.sidebar.open{transform:translateX(0)}.menu-backdrop.open{display:block;position:fixed;inset:0;z-index:25;background:#191d2b88;border:0}.menu-toggle{display:inline-grid;place-items:center}.topbar{padding:0 18px;gap:12px;height:66px}.topbar-search{display:none}.topbar-title{margin-right:auto}.content{padding:22px 18px}.auth-wrap{grid-template-columns:1fr}.auth-brand{display:none}.auth-mobile-logo{display:inline-flex;margin-bottom:40px}.auth-form{padding:32px 22px}.pricing-cards{grid-template-columns:1fr;max-width:480px;margin:auto}.pricing-section{padding:65px 20px}.page-heading{flex-wrap:wrap}.chat-box{height:580px;max-height:calc(100dvh - 130px)}}
@media(max-width:480px){.card{padding:20px}.grid,.form-grid,.tutor-context{grid-template-columns:1fr}.stats{gap:10px}.stat{padding:15px}.stat .eyebrow{font-size:9px}.stat small{font-size:10px}.actions>.btn{flex-grow:1}.chat-box{padding:0}.chat-log{padding:16px}.msg{max-width:95%}.chat-compose{padding:10px}.chat-compose .btn{padding:10px 12px}.topbar .badge{display:none}.timer{font-size:76px}.page-heading h1{font-size:32px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
.cookie-consent{position:fixed;z-index:90;inset-inline-end:24px;inset-block-end:24px;width:min(520px,calc(100vw - 48px));display:flex;align-items:center;justify-content:space-between;gap:22px;padding:20px;background:var(--paper-2);border:1px solid var(--ink);border-radius:10px;box-shadow:5px 5px 0 var(--gold)}.cookie-copy{display:grid;gap:4px;max-width:310px}.cookie-copy strong{font:600 20px/1.2 var(--display);letter-spacing:-.02em}.cookie-copy p{color:var(--ink-soft);font-size:12px;line-height:1.55}.cookie-copy .eyebrow{color:var(--crimson)}.cookie-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}.cookie-actions .btn{white-space:nowrap}.cookie-consent[hidden]{display:none}.cookie-consent .btn:hover{transform:translateY(-1px)}.cookie-consent .btn:active{transform:translateY(0) scale(.985)}
@media(max-width:480px){.cookie-consent{inset-inline:14px;width:auto;inset-block-end:14px;align-items:stretch;flex-direction:column;gap:14px;padding:18px}.cookie-copy{max-width:none}.cookie-actions{width:100%}.cookie-actions .btn{flex:1}}
.brand-emblem{width:42px;height:44px;flex:0 0 auto;object-fit:contain;border-radius:0;background:transparent;box-shadow:none;transition:transform var(--dur-fast) var(--ease-out-quart)}.logo:hover .brand-emblem{transform:translateY(-1px) scale(1.03)}.sidebar .brand-emblem,.auth-brand .brand-emblem{filter:brightness(0) invert(1)}
.is-app-loading{overflow:hidden}.app-loader{--loader-gap:18px;--loader-pad:24px;--loader-size:min(380px,72vw,55dvh);position:fixed;inset:0;z-index:1000;display:grid;place-items:center;background:var(--paper);opacity:1;transition:opacity 150ms cubic-bezier(.25,1,.5,1)}.app-loader.is-leaving{opacity:0;pointer-events:none}.loader-inner{display:grid;justify-items:center;gap:var(--loader-gap);padding:var(--loader-pad)}.loader-visual{display:grid;place-items:center;width:var(--loader-size);aspect-ratio:1}.loader-visual video,.loader-fallback{grid-area:1/1;width:100%;height:100%;object-fit:contain}.loader-visual video{display:block;opacity:0;mix-blend-mode:multiply}.loader-fallback{display:block;max-width:70%;max-height:85%;background:transparent}.app-loader.is-playing video{opacity:1}.app-loader.is-playing .loader-fallback{visibility:hidden}.loader-caption{font:500 10px/1.6 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--ink-soft);text-align:center}.app-loader.no-video video{display:none}.app-loader.no-video .loader-fallback{visibility:visible}.loader-skip{background:transparent;border:0;color:var(--ink-soft);font:12px/1.6 var(--body);min-height:44px;padding:0 var(--loader-pad);text-decoration:underline;text-underline-offset:4px}.loader-skip:hover,.loader-skip:focus-visible{color:var(--ink)}.loader-skip:active{opacity:.7}
@media(prefers-reduced-motion:reduce){.app-loader video{display:none}.app-loader .loader-fallback{display:block;visibility:visible}.app-loader{transition:none}}


.study-upload{position:relative;display:grid;justify-items:center;gap:8px;padding:28px 20px;border:1px dashed var(--navy);border-radius:10px;background:color-mix(in srgb,var(--paper-2) 80%,var(--note));text-align:center;cursor:pointer;transition:border-color var(--dur-fast),background-color var(--dur-fast),transform var(--dur-fast)}
.study-upload:hover,.study-upload.is-dragging{border-color:var(--gold);background:var(--note);transform:translateY(-1px)}
.study-upload:focus-within{outline:3px solid var(--gold);outline-offset:3px}
.study-upload.is-loading{opacity:.65;pointer-events:none}
.study-upload input{position:absolute;inset:0;width:100%;height:100%;min-height:0;padding:0;opacity:0;cursor:pointer}
.study-upload-icon{display:grid;place-items:center;width:46px;height:46px;border-radius:50%;background:var(--ink);color:var(--paper-2)}
.study-upload-icon svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.study-upload strong{font:600 18px/1.25 var(--display)}
.study-upload small{max-width:52ch;font-size:11px;color:var(--ink-soft)}
.study-image-list{display:grid;gap:9px}
.study-image{display:grid;grid-template-columns:56px minmax(0,1fr) 40px;align-items:center;gap:12px;padding:9px;border:1px solid var(--line);border-radius:8px;background:var(--paper-2)}
.study-image img{width:56px;height:56px;object-fit:cover;border-radius:5px;background:var(--paper-3)}
.study-image div{display:grid;gap:2px;min-width:0}.study-image strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px}.study-image small{font:10px var(--mono)}
.study-image button{display:grid;place-items:center;width:40px;height:40px;border:0;border-radius:6px;background:transparent;color:var(--ink-soft)}
.study-image button:hover{background:var(--paper-3);color:var(--crimson)}.study-image button:active{transform:scale(.96)}.study-image button svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}
.study-or{display:flex;align-items:center;gap:12px;color:var(--ink-faint);font:500 9px var(--mono);letter-spacing:.13em}.study-or:before,.study-or:after{content:'';height:1px;flex:1;background:var(--line)}
@media(max-width:480px){.study-upload{padding:24px 16px}.study-image{grid-template-columns:48px minmax(0,1fr) 40px}.study-image img{width:48px;height:48px}}


.study-file-icon{display:grid;place-items:center;width:56px;height:56px;border-radius:5px;background:var(--ink);color:var(--paper-2);font:600 9px var(--mono);letter-spacing:.04em}@media(max-width:480px){.study-file-icon{width:48px;height:48px}}


.source-files{display:grid;gap:8px}.source-file{display:grid;grid-template-columns:52px minmax(0,1fr) 20px;align-items:center;gap:10px;padding:10px;border:1px solid var(--line);border-radius:8px;background:var(--paper-2);color:var(--ink);text-decoration:none}.source-file:hover{border-color:var(--gold);background:var(--note)}.source-file:active{transform:translateY(1px)}.source-file-type{display:grid;place-items:center;min-height:42px;border-radius:5px;background:var(--ink);color:var(--paper-2);font:600 8px var(--mono);letter-spacing:.04em}.source-file>span:nth-child(2){display:grid;min-width:0}.source-file strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:11px}.source-file small{font-size:10px}.source-file svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}


.study-upload-status{display:inline-flex;align-items:center;min-height:26px;padding:4px 9px;border:1px solid var(--line);border-radius:5px;background:var(--paper-2);color:var(--ink);font:600 9px var(--mono);letter-spacing:.05em;text-transform:uppercase}