:root{--paper: #fbfaf8;--surface: #ffffff;--surface-sunk: #f4f2ee;--surface-raised: #ffffff;--ink: #1a1826;--ink-soft: #5a5570;--ink-faint: #8b86a0;--ink-invert: #ffffff;--primary: #5b4be7;--primary-hover: #4a3ad4;--primary-tint: #eeecfd;--primary-ring: rgba(91, 75, 231, .35);--accent: #f5a524;--accent-tint: #fef3e0;--success: #10b981;--success-tint: #e6f7f1;--danger: #ef4444;--danger-tint: #fdecec;--line: #e8e4de;--line-strong: #d6d0c7;--rule: #e9e6f5;--shadow-sm: 0 1px 2px rgba(26, 24, 38, .06);--shadow-md: 0 2px 8px rgba(26, 24, 38, .07), 0 1px 2px rgba(26, 24, 38, .04);--shadow-lg: 0 12px 32px rgba(26, 24, 38, .1), 0 2px 8px rgba(26, 24, 38, .05);--r-sm: 8px;--r-md: 12px;--r-lg: 18px;--r-xl: 26px;--r-full: 999px;--font-display: "Fraunces", "Iowan Old Style", Georgia, serif;--font-ui: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--page-max: 1080px;--gutter: 24px}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--paper: #14131c;--surface: #1c1b26;--surface-sunk: #17161f;--surface-raised: #232231;--ink: #f0eef7;--ink-soft: #a8a3bd;--ink-faint: #7a7590;--ink-invert: #14131c;--primary: #8b7cff;--primary-hover: #9d90ff;--primary-tint: #262244;--primary-ring: rgba(139, 124, 255, .4);--accent: #fbbf24;--accent-tint: #33280f;--success: #34d399;--success-tint: #12302a;--danger: #f87171;--danger-tint: #3a1f22;--line: #2e2c3d;--line-strong: #403d54;--rule: #272538;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);--shadow-md: 0 2px 8px rgba(0, 0, 0, .4), 0 1px 2px rgba(0, 0, 0, .3);--shadow-lg: 0 12px 32px rgba(0, 0, 0, .5), 0 2px 8px rgba(0, 0, 0, .3)}}:root[data-theme=dark]{--paper: #14131c;--surface: #1c1b26;--surface-sunk: #17161f;--surface-raised: #232231;--ink: #f0eef7;--ink-soft: #a8a3bd;--ink-faint: #7a7590;--ink-invert: #14131c;--primary: #8b7cff;--primary-hover: #9d90ff;--primary-tint: #262244;--primary-ring: rgba(139, 124, 255, .4);--accent: #fbbf24;--accent-tint: #33280f;--success: #34d399;--success-tint: #12302a;--danger: #f87171;--danger-tint: #3a1f22;--line: #2e2c3d;--line-strong: #403d54;--rule: #272538;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);--shadow-md: 0 2px 8px rgba(0, 0, 0, .4), 0 1px 2px rgba(0, 0, 0, .3);--shadow-lg: 0 12px 32px rgba(0, 0, 0, .5), 0 2px 8px rgba(0, 0, 0, .3)}*,*:before,*:after{box-sizing:border-box}*{margin:0}html{-webkit-text-size-adjust:100%}body{min-height:100dvh;background:var(--paper);color:var(--ink);font-family:var(--font-ui);font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}img,svg,video{display:block;max-width:100%}button,input,textarea,select{font:inherit;color:inherit}a{color:inherit;text-decoration:none}h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;line-height:1.15;letter-spacing:-.015em}:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}::selection{background:var(--primary-tint);color:var(--ink)}.shell{min-height:100dvh;display:flex;flex-direction:column}.container{width:100%;max-width:var(--page-max);margin-inline:auto;padding-inline:var(--gutter)}.stack{display:flex;flex-direction:column}.row{display:flex;align-items:center}.spacer{flex:1}.topbar{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--paper) 88%,transparent);-webkit-backdrop-filter:saturate(1.6) blur(12px);backdrop-filter:saturate(1.6) blur(12px);border-bottom:1px solid var(--line)}.topbar__inner{display:flex;align-items:center;gap:16px;height:62px}.brand{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-display);font-weight:700;font-size:19px;letter-spacing:-.02em}.brand__mark{width:30px;height:30px;border-radius:9px;background:linear-gradient(140deg,var(--primary),#8b7cff);display:grid;place-items:center;color:#fff;font-size:15px;font-weight:700;box-shadow:var(--shadow-sm);flex:none}.navlinks{display:flex;align-items:center;gap:4px}.navlink{padding:7px 13px;border-radius:var(--r-full);font-size:14px;font-weight:500;color:var(--ink-soft);transition:background .15s,color .15s}.navlink:hover{background:var(--surface-sunk);color:var(--ink)}.navlink[aria-current=page]{background:var(--primary-tint);color:var(--primary);font-weight:600}@media(max-width:720px){.navlinks{display:none}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border:1px solid transparent;border-radius:var(--r-full);background:transparent;font-size:14px;font-weight:600;line-height:1.2;cursor:pointer;white-space:nowrap;transition:background .15s,border-color .15s,transform .08s,box-shadow .15s,opacity .15s}.btn:active:not(:disabled){transform:translateY(1px)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn--primary{background:var(--primary);color:#fff;box-shadow:var(--shadow-sm)}.btn--primary:hover:not(:disabled){background:var(--primary-hover);box-shadow:var(--shadow-md)}.btn--ghost{color:var(--ink-soft);border-color:var(--line-strong);background:var(--surface)}.btn--ghost:hover:not(:disabled){color:var(--ink);border-color:var(--ink-faint)}.btn--quiet{color:var(--ink-soft);padding-inline:12px}.btn--quiet:hover:not(:disabled){background:var(--surface-sunk);color:var(--ink)}.btn--accent{background:var(--accent);color:#3a2a06;box-shadow:var(--shadow-sm)}.btn--accent:hover:not(:disabled){filter:brightness(1.05)}.btn--lg{padding:14px 26px;font-size:15.5px}.btn--sm{padding:7px 13px;font-size:13px}.btn--block{width:100%}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-sm)}.card--pad{padding:22px}.pill{display:inline-flex;align-items:center;gap:6px;padding:4px 11px;border-radius:var(--r-full);font-size:12.5px;font-weight:600;letter-spacing:.01em;background:var(--surface-sunk);color:var(--ink-soft)}.pill--primary{background:var(--primary-tint);color:var(--primary)}.pill--accent{background:var(--accent-tint);color:#a16207}.pill--success{background:var(--success-tint);color:#047857}@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .pill--accent{color:var(--accent)}:root:not([data-theme=light]) .pill--success{color:var(--success)}}:root[data-theme=dark] .pill--accent{color:var(--accent)}:root[data-theme=dark] .pill--success{color:var(--success)}.field{display:flex;flex-direction:column;gap:7px}.label{font-size:13px;font-weight:600;color:var(--ink-soft)}.hint{font-size:12.5px;color:var(--ink-faint);line-height:1.45}.input,.textarea{width:100%;padding:11px 14px;background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--r-md);font-size:14.5px;transition:border-color .15s,box-shadow .15s}.input::placeholder,.textarea::placeholder{color:var(--ink-faint)}.input:focus,.textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-ring)}.textarea{resize:vertical;min-height:96px;line-height:1.6}.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:14px}.section-title{font-size:19px;font-weight:600}.eyebrow{font-family:var(--font-ui);font-size:12px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--ink-faint)}.empty{display:grid;place-items:center;gap:14px;text-align:center;padding:56px 24px;border:1.5px dashed var(--line-strong);border-radius:var(--r-lg);color:var(--ink-soft)}.empty__icon{font-size:34px;line-height:1}@keyframes fade-up{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}.fade-up{animation:fade-up .35s cubic-bezier(.22,1,.36,1) both}@keyframes shimmer{0%{background-position:-420px 0}to{background-position:420px 0}}.skeleton{border-radius:var(--r-sm);background:linear-gradient(90deg,var(--surface-sunk) 0%,color-mix(in srgb,var(--surface-sunk) 55%,var(--surface)) 50%,var(--surface-sunk) 100%);background-size:840px 100%;animation:shimmer 1.4s infinite linear}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.muted{color:var(--ink-soft)}.faint{color:var(--ink-faint)}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.page{flex:1;padding-block:34px 96px}.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap}.page-title{font-size:clamp(28px,4.4vw,38px);margin-top:2px}.backlink{align-self:flex-start;font-size:13.5px;font-weight:600;color:var(--ink-faint);padding:5px 0;transition:color .15s}.backlink:hover{color:var(--primary)}.link{color:var(--primary);font-weight:600;text-decoration:underline;text-underline-offset:2px}.section-title--lg{font-size:clamp(24px,3.6vw,32px)}.section-head--center{justify-content:center;text-align:center;margin-bottom:34px}@keyframes spin{to{transform:rotate(360deg)}}.spinner{width:12px;height:12px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;animation:spin .7s linear infinite;opacity:.65;flex:none}.spinner--lg{width:22px;height:22px;border-width:2.5px;color:var(--primary);opacity:1}.subject-badge{width:52px;height:52px;display:grid;place-items:center;font-size:26px;border-radius:var(--r-md);background:var(--surface);border:1px solid var(--line);border-left:5px solid var(--tab);box-shadow:var(--shadow-sm);flex:none}.upload__actions{display:flex;gap:10px;flex-wrap:wrap}.course-list{display:flex;flex-direction:column;gap:8px}.course-row{display:flex;align-items:center;gap:13px;padding:14px 16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);transition:border-color .15s,transform .15s}.course-row:hover{border-color:var(--tab, var(--line-strong));transform:translate(3px)}.course-row__icon{font-size:19px;flex:none}.course-row__body{display:flex;flex-direction:column;flex:1;min-width:0}.course-row__title{font-weight:600;font-size:14.5px}.danger-zone{padding-top:12px;border-top:1px solid var(--line)}.danger-zone__btn{color:var(--danger)}.danger-zone__btn:hover{background:var(--danger-tint);color:var(--danger)}.tabs{display:flex;gap:4px;padding:4px;background:var(--surface-sunk);border-radius:var(--r-full);overflow-x:auto;scrollbar-width:none}.tabs::-webkit-scrollbar{display:none}.tabs__btn{display:inline-flex;align-items:center;gap:5px;padding:8px 17px;border:none;border-radius:var(--r-full);background:transparent;font-size:14px;font-weight:600;color:var(--ink-soft);cursor:pointer;white-space:nowrap;transition:background .15s,color .15s}.tabs__btn:hover{color:var(--ink)}.tabs__btn.is-on{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-sm)}.tabs__lock{color:var(--accent);font-size:11px}.review-banner{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;padding:18px 20px;background:var(--accent-tint);border:1px solid color-mix(in srgb,var(--accent) 34%,transparent);border-radius:var(--r-lg)}.quota-warn{flex-basis:100%;font-size:13.5px;color:var(--ink-soft);margin-top:2px}.original{margin:0;padding:14px;background:var(--surface-sunk);border-radius:var(--r-lg);border:1px solid var(--line)}.original img{width:100%;border-radius:var(--r-md);box-shadow:var(--shadow-md)}.original figcaption{margin-top:9px;text-align:center}.sheet{padding:clamp(24px,4vw,40px);background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-md)}.sheet__hook{font-family:var(--font-display);font-size:clamp(17px,2.3vw,21px);line-height:1.45;font-style:italic;color:var(--ink);padding-left:17px;border-left:3px solid var(--primary);margin-bottom:30px}.sheet__section+.sheet__section{margin-top:26px;padding-top:22px;border-top:1px solid var(--line)}.sheet__heading{font-family:var(--font-ui);font-size:11.5px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--primary);margin-bottom:11px}.sheet__list{list-style:none;padding:0;display:flex;flex-direction:column;gap:9px}.sheet__list li{position:relative;padding-left:20px;font-size:15px;line-height:1.6;color:var(--ink-soft)}.sheet__list li:before{content:"";position:absolute;left:3px;top:.62em;width:5px;height:5px;border-radius:50%;background:var(--tab, var(--primary))}.sheet__list strong{color:var(--ink);font-weight:700}.glossary{display:grid;grid-template-columns:auto 1fr;gap:8px 18px;margin:0;font-size:14.5px}.glossary dt{font-weight:700;color:var(--ink);white-space:nowrap}.glossary dd{margin:0;color:var(--ink-soft);line-height:1.55}@media(max-width:560px){.glossary{grid-template-columns:1fr;gap:3px}.glossary dd{margin-bottom:10px}}.sheet__foot{margin-top:28px;padding-top:16px;border-top:1px solid var(--line);text-align:center}.quiz-head{display:flex;align-items:center;gap:16px}.quiz-progress{flex:1;display:flex;flex-direction:column;gap:6px}.quiz-progress__label{font-size:12.5px;font-weight:600;color:var(--ink-faint)}.quiz-progress__track{height:5px;border-radius:var(--r-full);background:var(--surface-sunk);overflow:hidden}.quiz-progress__fill{display:block;height:100%;border-radius:var(--r-full);background:var(--primary);transition:width .35s cubic-bezier(.22,1,.36,1)}.quiz-badge{margin-right:8px}.quiz-best{flex:none;padding:5px 12px;border-radius:var(--r-full);background:var(--success-tint);color:var(--success);font-size:12.5px;font-weight:700}.quiz-history{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--surface-sunk);border-radius:var(--r-md)}.quiz-history__label{font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint)}.quiz-history__bars{display:flex;align-items:flex-end;gap:5px;height:32px;flex:1}.quiz-history__bar{width:11px;height:var(--h);border-radius:3px 3px 0 0;background:var(--primary);opacity:.55}.quiz-history__bar:last-child{opacity:1}.quiz-history__bar[data-perfect]{background:var(--success)}.quiz-history__last{font-size:12.5px;font-weight:600}.quiz-result__actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:10px}.linkbtn{border:none;background:none;padding:0;font:inherit;font-weight:600;color:var(--primary);text-decoration:underline;text-underline-offset:2px;cursor:pointer}.linkbtn:hover{color:var(--primary-hover)}.qcard.is-reported{border-style:dashed;opacity:.75}.qcard__reported{margin-bottom:12px;padding:9px 13px;border-radius:var(--r-sm);background:var(--accent-tint);font-size:13px;line-height:1.5;color:var(--ink-soft)}.qcard__flag{display:block;margin-top:10px;font-size:12.5px;font-weight:500;color:var(--ink-faint);text-decoration:none}.qcard__flag:hover{color:var(--danger);text-decoration:underline}.quiz-result{display:flex;align-items:center;gap:18px;padding:20px 24px;border-radius:var(--r-lg);background:var(--surface-sunk);border:1px solid var(--line)}.quiz-result.is-perfect{background:var(--success-tint);border-color:color-mix(in srgb,var(--success) 34%,transparent)}.quiz-result__score{font-family:var(--font-display);font-size:30px;font-weight:700;letter-spacing:-.02em;flex:none}.quiz-result p{color:var(--ink-soft);font-size:14.5px}.qcard{padding:22px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-sm)}.qcard__q{display:flex;gap:11px;font-family:var(--font-ui);font-size:15.5px;font-weight:600;line-height:1.45;margin-bottom:15px}.qcard__n{display:grid;place-items:center;width:23px;height:23px;flex:none;border-radius:50%;background:var(--primary-tint);color:var(--primary);font-size:12.5px;font-weight:700}.qcard__choices{display:flex;flex-direction:column;gap:8px}.choice{display:flex;align-items:center;gap:11px;width:100%;padding:12px 15px;text-align:left;background:var(--surface);border:1.5px solid var(--line);border-radius:var(--r-md);font-size:14.5px;line-height:1.4;cursor:pointer;transition:border-color .14s,background .14s,opacity .14s}.choice:hover:not(:disabled){border-color:var(--primary);background:var(--primary-tint)}.choice:disabled{cursor:default}.choice__letter{display:grid;place-items:center;width:22px;height:22px;flex:none;border-radius:var(--r-sm);background:var(--surface-sunk);font-size:12px;font-weight:700;color:var(--ink-faint)}.choice__mark{margin-left:auto;font-weight:700;font-size:16px}.choice.is-correct{border-color:var(--success);background:var(--success-tint)}.choice.is-correct .choice__letter,.choice.is-correct .choice__mark{color:var(--success)}.choice.is-wrong{border-color:var(--danger);background:var(--danger-tint)}.choice.is-wrong .choice__letter,.choice.is-wrong .choice__mark{color:var(--danger)}.choice.is-dim{opacity:.45}.qcard__explain{margin-top:14px;padding:13px 16px;background:var(--surface-sunk);border-radius:var(--r-md);font-size:14px;line-height:1.6;color:var(--ink-soft)}.qcard__explain strong{color:var(--ink)}.tutor{display:flex;flex-direction:column;gap:14px}.tutor__banner{display:flex;gap:12px;padding:14px 18px;background:var(--primary-tint);border-radius:var(--r-md);font-size:13.5px;line-height:1.55;color:var(--ink-soft)}.tutor__thread{display:flex;flex-direction:column;gap:11px;min-height:300px;max-height:480px;overflow-y:auto;padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg)}.bubble{max-width:82%;padding:12px 16px;border-radius:var(--r-lg);font-size:14.5px;line-height:1.55;white-space:pre-wrap;animation:fade-up .25s cubic-bezier(.22,1,.36,1) both}.bubble--tutor{align-self:flex-start;background:var(--surface-sunk);border-bottom-left-radius:6px}.bubble--student{align-self:flex-end;background:var(--primary);color:#fff;border-bottom-right-radius:6px}.bubble--thinking{display:flex;gap:4px;padding:15px 18px}.bubble--thinking span{width:6px;height:6px;border-radius:50%;background:var(--ink-faint);animation:blink 1.3s infinite}.bubble--thinking span:nth-child(2){animation-delay:.18s}.bubble--thinking span:nth-child(3){animation-delay:.36s}@keyframes blink{0%,60%,to{opacity:.25}30%{opacity:1}}.tutor__composer{display:flex;gap:10px}.tutor__starters{display:flex;flex-wrap:wrap;gap:8px}.tutor__starter{padding:8px 14px;border:1px solid var(--line-strong);border-radius:var(--r-full);background:var(--surface);font-size:13.5px;color:var(--ink-soft);cursor:pointer;transition:border-color .14s,color .14s,background .14s}.tutor__starter:hover{border-color:var(--primary);background:var(--primary-tint);color:var(--primary)}.crash{min-height:100dvh;display:grid;place-items:center;padding:24px;background:var(--paper)}.crash__box{display:grid;place-items:center;gap:13px;max-width:460px;text-align:center;padding:clamp(32px,6vw,48px);background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-md)}.crash__icon{font-size:38px;line-height:1}.crash__title{font-size:23px}.crash__actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:6px}.crash__details{width:100%;margin-top:8px;font-size:12.5px;color:var(--ink-faint);text-align:left}.crash__details summary{cursor:pointer;text-align:center}.crash__details pre{margin-top:9px;padding:11px;border-radius:var(--r-sm);background:var(--surface-sunk);font-size:11.5px;line-height:1.5;white-space:pre-wrap;word-break:break-word}.paywall{display:grid;place-items:center;gap:13px;text-align:center;padding:52px 28px;background:linear-gradient(150deg,var(--accent-tint),var(--surface) 68%);border:1px solid color-mix(in srgb,var(--accent) 30%,transparent);border-radius:var(--r-lg)}.paywall__icon{font-size:40px;line-height:1}.paywall h3{font-size:21px}.paywall p{max-width:44ch;font-size:14.5px;line-height:1.6}.quota{display:flex;flex-direction:column;gap:8px}.quota__head{display:flex;align-items:baseline;justify-content:space-between;font-size:13.5px}.quota__track{height:8px;border-radius:var(--r-full);background:var(--surface-sunk);overflow:hidden}.quota__fill{height:100%;border-radius:var(--r-full);background:linear-gradient(90deg,var(--primary),#8b7cff);transition:width .4s cubic-bezier(.22,1,.36,1)}.upsell{display:flex;align-items:center;justify-content:space-between;gap:22px;flex-wrap:wrap;padding:20px 22px;background:linear-gradient(140deg,var(--accent-tint),var(--surface) 70%);border:1px solid color-mix(in srgb,var(--accent) 30%,transparent);border-radius:var(--r-lg)}.upsell__list{margin:8px 0 0;padding-left:18px;font-size:13.5px;line-height:1.75;color:var(--ink-soft)}.subject-lines{list-style:none;padding:0;display:flex;flex-direction:column;gap:3px}.subject-line{display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:var(--r-md);font-size:14.5px;transition:background .14s}.subject-line:hover{background:var(--surface-sunk)}.subject-line__dot{width:9px;height:9px;border-radius:50%;flex:none}.subject-line__name{font-weight:600;flex:1}@media(max-width:600px){.subject-line{flex-wrap:wrap;gap:8px}.subject-line__name{flex-basis:100%}}.boot{min-height:100dvh;display:grid;place-items:center;background:var(--paper)}.boot--inline{min-height:50vh;background:transparent}.alert{display:flex;align-items:flex-start;gap:12px;padding:14px 18px;border-radius:var(--r-md);font-size:14.5px;line-height:1.55}.alert p{flex:1}.alert__icon{flex:none;font-size:17px;line-height:1.4}.alert__actions{display:flex;gap:8px;flex:none}.alert--danger{background:var(--danger-tint);border:1px solid color-mix(in srgb,var(--danger) 32%,transparent);color:var(--ink)}.auth-error{font-size:13px;font-weight:600;color:var(--danger)}.pill--danger{background:var(--danger-tint);color:var(--danger)}.avatar{width:52px;height:52px;border-radius:50%;object-fit:cover;flex:none;border:1px solid var(--line)}.avatar--letter{display:grid;place-items:center;background:var(--primary);color:#fff;font-family:var(--font-display);font-size:22px;font-weight:700;border:none}.notice{padding:14px 18px;border-radius:var(--r-md);background:var(--surface-sunk);border-left:3px solid var(--ink-faint);font-size:14px}.notice code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.88em;padding:1px 5px;border-radius:4px;background:var(--surface);border:1px solid var(--line)}.editable{display:inline-flex;align-items:center;gap:9px;max-width:100%;padding:2px 8px 2px 0;border:none;border-radius:var(--r-sm);background:none;font:inherit;color:inherit;text-align:left;cursor:text;transition:background .14s}.editable:hover{background:var(--surface-sunk)}.editable__pen{flex:none;font-size:.5em;color:var(--ink-faint);opacity:0;transition:opacity .14s}.editable:hover .editable__pen,.editable:focus-visible .editable__pen{opacity:1}.editable__input{width:100%;max-width:100%;padding:2px 8px;border:none;border-bottom:2px solid var(--primary);border-radius:var(--r-sm) var(--r-sm) 0 0;background:var(--surface-sunk);font:inherit;color:inherit}.editable__input:focus{outline:none}.subject-badge--button{cursor:pointer;transition:transform .14s,box-shadow .14s}.subject-badge--button:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.onboarding{min-height:100dvh;display:grid;place-items:center;padding:24px;background:radial-gradient(700px 300px at 20% -10%,var(--primary-tint),transparent 68%),radial-gradient(500px 260px at 90% 110%,var(--accent-tint),transparent 64%),var(--paper)}.onboarding__card{display:flex;flex-direction:column;gap:14px;width:100%;max-width:420px;padding:clamp(28px,5vw,40px);background:var(--surface);border:1px solid var(--line);border-radius:var(--r-xl);box-shadow:var(--shadow-lg)}.onboarding__brand{margin-bottom:6px}.onboarding__title{font-size:clamp(23px,3.4vw,28px);letter-spacing:-.025em;line-height:1.15}.onboarding__sub{font-size:14.5px;line-height:1.55;margin-bottom:4px}.onboarding__input{font-size:16px;padding:13px 16px}.onboarding__note{margin-top:4px;text-align:center}.usage{display:flex;gap:clamp(20px,4vw,40px);flex-wrap:wrap}.usage .stat__value{font-family:var(--font-display);font-size:28px;font-weight:700;line-height:1;letter-spacing:-.03em}.usage .stat__label{margin-top:4px;font-size:11.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint)}.offline-bar{position:sticky;top:62px;z-index:40;display:flex;align-items:center;justify-content:center;gap:9px;padding:9px 18px;background:var(--accent-tint);border-bottom:1px solid color-mix(in srgb,var(--accent) 34%,transparent);font-size:13.5px;font-weight:500;color:var(--ink-soft);text-align:center}.themeswitch{display:inline-flex;gap:4px;padding:4px;border-radius:var(--r-full);background:var(--surface-sunk);border:1px solid var(--line);flex-wrap:wrap}.themeswitch__btn{display:inline-flex;align-items:center;gap:7px;padding:8px 16px;border:none;border-radius:var(--r-full);background:transparent;font-size:13.5px;font-weight:600;color:var(--ink-soft);cursor:pointer;transition:background .14s,color .14s}.themeswitch__btn:hover{color:var(--ink)}.themeswitch__btn.is-on{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-sm)}.status-list{list-style:none;padding:0;display:flex;flex-direction:column;gap:13px}.status-list li{display:flex;align-items:flex-start;gap:11px}.status-list li>span:last-child{display:flex;flex-direction:column;gap:2px}.status-list__dot{width:9px;height:9px;margin-top:6px;border-radius:50%;flex:none;background:var(--ink-faint)}.status-list li.is-on .status-list__dot{background:var(--success);box-shadow:0 0 0 3px var(--success-tint)}.upload{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;padding:22px;border:1px solid color-mix(in srgb,var(--primary) 22%,var(--line));border-radius:var(--r-lg);background:linear-gradient(135deg,var(--primary-tint),var(--surface) 62%);box-shadow:var(--shadow-sm);transition:border-color .15s,background .15s}.upload.is-dragging{border-color:var(--primary);border-style:dashed;background:var(--primary-tint)}.upload__status,.upload__error{flex-basis:100%;margin-top:4px}.upload__error{font-size:13.5px;font-weight:600;color:var(--danger)}.original__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}.original__item{margin:0}.original__item img{width:100%;border-radius:var(--r-md);box-shadow:var(--shadow-md);transition:transform .15s}.original__item a:hover img{transform:scale(1.02)}.original__item figcaption{margin-top:6px;text-align:center}.original__note{margin-top:12px;text-align:center}.tabbar{display:none}@media(max-width:720px){.tabbar{position:fixed;bottom:0;left:0;right:0;z-index:60;display:flex;background:color-mix(in srgb,var(--surface) 94%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}.tabbar__item{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:9px 0 11px;font-size:11px;font-weight:600;color:var(--ink-faint)}.tabbar__item span{font-size:19px}.tabbar__avatar{width:21px;height:21px;border-radius:50%;object-fit:cover}.tabbar__item[aria-current=page]{color:var(--primary)}}.plan--inline{gap:12px;padding:16px 18px;border-radius:var(--r-md);background:var(--surface-sunk);border:1px solid var(--line)}.plan--inline .plan__price{font-size:27px}.legal__body{padding:44px 0 90px}.legal__date{margin-top:6px;font-size:13px}.legal__lead{margin-top:26px;font-size:16px;color:var(--ink-soft);border-left:3px solid var(--primary);padding-left:16px}.legal__body h2{margin-top:38px;margin-bottom:12px;font-family:var(--font-display);font-size:21px;font-weight:600;letter-spacing:-.015em}.legal__body p,.legal__body li{font-size:15px;line-height:1.72;color:var(--ink-soft)}.legal__body p{margin-bottom:13px}.legal__body strong{color:var(--ink);font-weight:600}.legal__body ul{margin:0 0 15px;padding-left:20px;display:flex;flex-direction:column;gap:9px}.legal__body li::marker{color:var(--primary)}.legal__body a{color:var(--primary);text-decoration:underline;text-underline-offset:2px}.legal__body code{padding:1px 6px;border-radius:var(--r-sm);background:var(--surface-sunk);font-size:13.5px}.legal__nav{display:flex;flex-wrap:wrap;gap:18px;margin-top:52px;padding-top:22px;border-top:1px solid var(--line);font-size:14px}.essai-bandeau{display:flex;align-items:center;gap:9px;margin-bottom:14px;padding:10px 14px;border-radius:var(--r-md);background:var(--surface-sunk);border:1px solid var(--line);font-size:13.5px;color:var(--ink-soft)}.bubble__photo{display:block;width:100%;max-width:220px;max-height:260px;object-fit:cover;border-radius:var(--r-sm);margin-bottom:8px;background:var(--surface-sunk)}.tutor__jointe{display:flex;align-items:center;gap:11px;margin-bottom:10px;padding:8px 10px 8px 8px;border:1px solid var(--line);border-radius:var(--r-md);background:var(--surface-sunk);font-size:13.5px;color:var(--ink-soft)}.tutor__jointe img{width:42px;height:42px;object-fit:cover;border-radius:var(--r-sm);flex:none}.tutor__jointe span{flex:1}.tutor__joindre{flex:none;display:grid;place-items:center;width:42px;height:42px;border:1px solid var(--line);border-radius:var(--r-md);background:var(--surface);font-size:18px;cursor:pointer;transition:border-color .15s,background .15s}.tutor__joindre:hover:not(:disabled){border-color:var(--line-strong);background:var(--surface-sunk)}.tutor__joindre:disabled{opacity:.5;cursor:default}.container--narrow{max-width:760px}@media(max-width:760px){.navlink--hide-sm{display:none}}.js-reveal .reveal{opacity:0;transform:translateY(18px);transition:opacity .6s cubic-bezier(.22,1,.36,1),transform .6s cubic-bezier(.22,1,.36,1)}.js-reveal .reveal.is-in{opacity:1;transform:none}@media(prefers-reduced-motion:reduce){.js-reveal .reveal{opacity:1;transform:none}}.section{padding-block:clamp(56px,8vw,108px)}.section--sunk{background:var(--surface-sunk);border-block:1px solid var(--line)}.section-intro{max-width:620px;margin:0 auto clamp(40px,6vw,68px);text-align:center}.section-intro .eyebrow{display:block;margin-bottom:10px}.section-lead{margin-top:14px;font-size:16.5px;line-height:1.65;color:var(--ink-soft)}.hero{position:relative;padding-block:clamp(48px,8vw,104px) clamp(44px,7vw,88px);background:radial-gradient(920px 420px at 12% -12%,var(--primary-tint),transparent 64%),radial-gradient(720px 380px at 92% -4%,var(--accent-tint),transparent 58%);overflow:hidden}.hero__grid{display:grid;grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:clamp(36px,5vw,72px);align-items:center}.hero__copy{display:flex;flex-direction:column;align-items:flex-start;gap:20px;animation:fade-up .6s cubic-bezier(.22,1,.36,1) both}.hero__title{font-size:clamp(36px,6.2vw,60px);line-height:1.04;letter-spacing:-.035em}.hero__title em{font-style:italic;color:var(--primary)}.hero__sub{font-size:clamp(16px,1.7vw,18px);line-height:1.62;color:var(--ink-soft);max-width:44ch}.hero__cta{display:flex;flex-direction:column;gap:11px;align-items:flex-start;margin-top:4px}.hero__visual{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:14px;animation:fade-up .7s cubic-bezier(.22,1,.36,1) .12s both}.hero__arrow{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--primary);color:#fff;font-size:18px;font-weight:700;box-shadow:var(--shadow-md)}@media(max-width:940px){.hero__grid{grid-template-columns:1fr}.hero__visual{grid-template-columns:1fr;gap:24px;max-width:400px;margin-inline:auto}.hero__arrow{transform:rotate(90deg);justify-self:center}}.mock{position:relative}.mock__tag{position:absolute;top:-11px;left:16px;z-index:2;padding:3px 11px;border-radius:var(--r-full);background:var(--ink);color:var(--paper);font-size:11px;font-weight:700;letter-spacing:.05em;text-transform:uppercase}.mock__tag--primary{background:var(--primary);color:#fff}.mock__tag--accent{background:var(--accent);color:#3a2a06}.mock__paper{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);padding:24px 20px 20px;box-shadow:var(--shadow-lg)}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-7px)}}.mock--photo{transform:rotate(-2.2deg)}.mock--photo .mock__paper{animation:float 7s ease-in-out infinite}.mock--notebook .mock__paper{animation:float 7s ease-in-out .9s infinite}.mock__paper--ruled{background-image:repeating-linear-gradient(var(--surface) 0 25px,var(--rule) 25px 26px);background-position:0 16px;min-height:252px}.scrawl{font-family:var(--font-display);font-style:italic;font-size:13.5px;line-height:26px;color:#3d4a7a;letter-spacing:.01em}.scrawl--title{font-weight:700;font-size:16px;text-decoration:underline;text-underline-offset:3px;margin-bottom:4px}.scrawl--formula{font-weight:700;color:#b4433f}.scrawl--faded{opacity:.6;font-size:12.5px}.mock__paper--margin{position:relative;padding-left:30px;min-height:252px}.mock__paper--margin:before{content:"";position:absolute;top:14px;bottom:14px;left:17px;width:1.5px;background:color-mix(in srgb,var(--danger) 30%,transparent)}.mini-nb__title{font-size:15.5px;margin-bottom:12px;padding-bottom:7px;border-bottom:1px solid var(--line)}.mini-nb__heading{display:block;font-family:var(--font-ui);font-size:11px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--primary);margin-bottom:5px}.mini-nb__p{font-family:var(--font-display);font-size:12.5px;line-height:1.62;color:var(--ink-soft)}.mini-nb__formula{margin:11px 0;padding:9px 12px;border-radius:var(--r-sm);background:var(--surface-sunk);border-left:2.5px solid var(--primary);font-family:var(--font-display);font-size:13.5px;font-weight:700;text-align:center;letter-spacing:.02em}.mini-nb__callout{padding:9px 12px;border-radius:var(--r-sm);background:var(--primary-tint);font-size:12px;line-height:1.5;color:var(--ink-soft)}.mini-nb__callout-label{display:block;font-size:9.5px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;color:var(--primary);margin-bottom:3px}.mini-sheet__title{font-size:15px;margin-bottom:7px}.mini-sheet__hook{font-family:var(--font-display);font-style:italic;font-size:12.5px;line-height:1.5;color:var(--ink-soft);padding-left:10px;border-left:2.5px solid var(--primary);margin-bottom:15px}.mini-sheet__section+.mini-sheet__section{margin-top:13px;padding-top:12px;border-top:1px solid var(--line)}.mini-sheet__heading{display:block;font-size:10.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--primary);margin-bottom:6px}.mini-sheet__section ul{margin:0;padding-left:16px}.mini-sheet__section li{font-size:12.5px;line-height:1.6;color:var(--ink-soft)}.mini-sheet__section strong{color:var(--ink)}.mini-quiz__bar{height:4px;border-radius:var(--r-full);background:var(--surface-sunk);margin-bottom:14px;overflow:hidden}.mini-quiz__bar span{display:block;width:40%;height:100%;border-radius:var(--r-full);background:var(--primary)}.mini-quiz__q{display:flex;gap:8px;font-size:12.5px;font-weight:600;line-height:1.45;margin-bottom:11px}.mini-quiz__n{display:grid;place-items:center;width:19px;height:19px;flex:none;border-radius:50%;background:var(--primary-tint);color:var(--primary);font-size:10.5px;font-weight:700}.mini-quiz__choice{display:flex;align-items:center;gap:9px;padding:8px 11px;margin-bottom:6px;border:1.5px solid var(--line);border-radius:var(--r-sm);font-size:11.5px;line-height:1.35;color:var(--ink-soft)}.mini-quiz__letter{display:grid;place-items:center;width:17px;height:17px;flex:none;border-radius:4px;background:var(--surface-sunk);font-size:9.5px;font-weight:700;color:var(--ink-faint)}.mini-quiz__mark{margin-left:auto;font-weight:700;font-size:13px}.mini-quiz__choice.is-correct{border-color:var(--success);background:var(--success-tint)}.mini-quiz__choice.is-correct .mini-quiz__letter,.mini-quiz__choice.is-correct .mini-quiz__mark{color:var(--success)}.mini-quiz__choice.is-wrong{border-color:var(--danger);background:var(--danger-tint)}.mini-quiz__choice.is-wrong .mini-quiz__letter,.mini-quiz__choice.is-wrong .mini-quiz__mark{color:var(--danger)}.mini-quiz__explain{margin-top:10px;padding:10px 12px;border-radius:var(--r-sm);background:var(--surface-sunk);font-size:11.5px;line-height:1.55;color:var(--ink-soft)}.mini-quiz__explain strong{color:var(--ink)}.mock__paper--chat{display:flex;flex-direction:column;gap:8px;background:var(--surface-sunk)}.mini-chat__bubble{max-width:86%;padding:9px 13px;border-radius:var(--r-md);font-size:12.5px;line-height:1.5}.mini-chat__bubble--tutor{align-self:flex-start;background:var(--surface);border:1px solid var(--line);border-bottom-left-radius:5px;color:var(--ink-soft)}.mini-chat__bubble--student{align-self:flex-end;background:var(--primary);color:#fff;border-bottom-right-radius:5px}.strip{padding-block:34px;border-block:1px solid var(--line);background:var(--surface)}.strip__label{text-align:center;font-size:12px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:18px}.strip__list{list-style:none;padding:0;display:flex;flex-wrap:wrap;justify-content:center;gap:10px}.strip__item{display:inline-flex;align-items:center;gap:7px;padding:8px 15px;border-radius:var(--r-full);background:var(--surface-sunk);border:1px solid var(--line);font-size:13.5px;font-weight:600;color:var(--ink-soft)}.pillar{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(32px,6vw,76px);align-items:center}.pillar+.pillar{margin-top:clamp(56px,8vw,104px)}.pillar--flipped .pillar__copy{order:2}.pillar__copy{display:flex;flex-direction:column;align-items:flex-start;gap:11px}.pillar__n{display:grid;place-items:center;width:34px;height:34px;border-radius:var(--r-sm);background:var(--primary-tint);color:var(--primary);font-family:var(--font-display);font-size:16px;font-weight:700;margin-bottom:3px}.pillar__title{font-size:clamp(22px,3vw,29px);letter-spacing:-.02em}.pillar__body{font-size:15.5px;line-height:1.68;color:var(--ink-soft);max-width:46ch}.pillar__visual{max-width:400px;justify-self:center;width:100%}@media(max-width:860px){.pillar{grid-template-columns:1fr;gap:34px}.pillar--flipped .pillar__copy{order:0}}.checklist{list-style:none;padding:0;margin-top:4px;display:flex;flex-direction:column;gap:9px}.checklist li{position:relative;padding-left:27px;font-size:14.5px;line-height:1.5;color:var(--ink-soft)}.checklist li:before{content:"✓";position:absolute;left:0;top:0;display:grid;place-items:center;width:18px;height:18px;border-radius:50%;background:var(--success-tint);color:var(--success);font-size:10.5px;font-weight:800}.feature{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(32px,5vw,64px);align-items:center}.feature--reverse .feature__copy{order:2}.feature__copy{display:flex;flex-direction:column;align-items:flex-start;gap:13px}.feature__body{font-size:15.5px;line-height:1.68;color:var(--ink-soft);max-width:46ch}.feature__demo{display:flex;flex-direction:column;gap:12px}.feature__arrow{text-align:center;color:var(--primary);font-size:19px;font-weight:700}.teacher-quote{font-family:var(--font-display);font-style:italic;font-size:15px;line-height:1.55;color:var(--ink);padding:13px 16px;background:var(--surface-sunk);border-radius:var(--r-md);border-left:3px solid var(--primary)}.teacher-result{font-size:14px;line-height:1.55;color:var(--ink-soft);padding:13px 16px;background:var(--primary-tint);border-radius:var(--r-md)}.teacher-result strong{color:var(--primary)}@media(max-width:860px){.feature{grid-template-columns:1fr}.feature--reverse .feature__copy{order:0}}.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(272px,1fr));gap:22px;max-width:740px;margin-inline:auto;align-items:stretch}.plan{display:flex;flex-direction:column;gap:15px;position:relative}.plan--featured{border-color:var(--primary);box-shadow:var(--shadow-lg)}.plan__ribbon{position:absolute;top:-11px;left:50%;transform:translate(-50%);padding:3px 14px;border-radius:var(--r-full);background:var(--primary);color:#fff;font-size:11.5px;font-weight:700;letter-spacing:.03em;white-space:nowrap}.plan__name{font-size:19px}.plan__price{font-family:var(--font-display);font-size:34px;font-weight:600;letter-spacing:-.025em;line-height:1}.plan__price span{font-family:var(--font-ui);font-size:14px;font-weight:500}.plan__list{list-style:none;padding:0;display:flex;flex-direction:column;gap:10px;font-size:14px;color:var(--ink-soft);flex:1}.plan__list li{position:relative;padding-left:25px}.plan__list li:before{content:"✓";position:absolute;left:0;top:0;display:grid;place-items:center;width:17px;height:17px;border-radius:50%;background:var(--success-tint);color:var(--success);font-size:10px;font-weight:800}.plan__list strong{color:var(--ink)}.plan__off{opacity:.5}.plan__off:before{content:"—"!important;background:var(--surface-sunk)!important;color:var(--ink-faint)!important}.faq{border:1px solid var(--line);border-radius:var(--r-lg);background:var(--surface);overflow:hidden}.faq__item+.faq__item{border-top:1px solid var(--line)}.faq__q{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;padding:19px 22px;border:none;background:transparent;text-align:left;font-size:15.5px;font-weight:600;color:var(--ink);cursor:pointer;transition:background .14s}.faq__q:hover{background:var(--surface-sunk)}.faq__chevron{flex:none;font-size:17px;line-height:1;color:var(--ink-faint);transition:transform .22s cubic-bezier(.22,1,.36,1)}.faq__item.is-open .faq__chevron{transform:rotate(180deg);color:var(--primary)}.faq__a{padding:0 22px 20px;font-size:14.5px;line-height:1.68;color:var(--ink-soft);max-width:62ch;animation:fade-up .28s cubic-bezier(.22,1,.36,1) both}.cta-final{padding-block:clamp(48px,7vw,88px)}.cta-final__box{display:grid;place-items:center;gap:13px;text-align:center;padding:clamp(40px,6vw,68px) clamp(24px,4vw,48px);border-radius:var(--r-xl);background:radial-gradient(600px 260px at 30% 0%,var(--primary-tint),transparent 68%),radial-gradient(500px 240px at 80% 100%,var(--accent-tint),transparent 62%),var(--surface);border:1px solid var(--line);box-shadow:var(--shadow-md)}.cta-final__title{font-size:clamp(24px,3.6vw,34px);letter-spacing:-.025em;max-width:20ch}.cta-final__sub{font-size:16px;color:var(--ink-soft);margin-bottom:6px}.footer{border-top:1px solid var(--line);padding-block:30px}.footer__inner{display:flex;align-items:flex-start;justify-content:space-between;gap:26px;flex-wrap:wrap;font-size:13.5px}.footer__brand{display:flex;flex-direction:column;gap:7px}.footer__links{display:flex;gap:20px}.footer__links a{color:var(--ink-soft);font-weight:500;transition:color .14s}.footer__links a:hover{color:var(--primary)}.footer__legal{margin-left:auto}@media(max-width:620px){.footer__legal{margin-left:0;flex-basis:100%}}.plan--bientot{border-style:dashed}.plan--bientot .plan__ribbon{background:var(--ink-faint)}.plan__price--barre{color:var(--ink-faint)}.plan__price--barre s{text-decoration-thickness:2px;text-decoration-color:var(--ink-faint)}.plan__attente{margin-top:-6px;font-size:13px;font-weight:600;letter-spacing:.02em;color:var(--ink-faint)}.plan__note{margin-top:10px;font-size:12.5px;line-height:1.5;color:var(--ink-faint)}.dash{display:flex;flex-direction:column;gap:clamp(30px,4vw,44px)}.dash-section{display:flex;flex-direction:column}.dash-hero{display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;padding:clamp(22px,3vw,32px) clamp(22px,3.5vw,36px);border-radius:var(--r-xl);border:1px solid var(--line);background:radial-gradient(620px 260px at 8% -30%,var(--primary-tint),transparent 70%),radial-gradient(420px 220px at 96% 130%,var(--accent-tint),transparent 68%),var(--surface);box-shadow:var(--shadow-sm)}.dash-hero__text{display:flex;flex-direction:column;gap:5px;min-width:0}.dash-hero__title{font-size:clamp(27px,4vw,36px);letter-spacing:-.03em;line-height:1.08}.dash-hero__sub{font-size:15px;line-height:1.55;color:var(--ink-soft);max-width:46ch}.dash-stats{display:flex;gap:clamp(18px,3vw,34px);margin:0}.stat{display:flex;flex-direction:column;align-items:flex-start}.stat__value{font-family:var(--font-display);font-size:clamp(24px,3.4vw,32px);font-weight:700;line-height:1;letter-spacing:-.03em;color:var(--ink)}.stat--success .stat__value{color:var(--success)}.stat__label{margin:4px 0 0;font-size:11.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint)}@media(max-width:640px){.dash-hero{align-items:flex-start}.dash-stats{width:100%;justify-content:space-between}}.todo-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(272px,1fr));gap:14px}.todo-card{position:relative;display:flex;flex-direction:column;gap:9px;padding:18px 20px 16px;background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--tab);border-radius:var(--r-md);box-shadow:var(--shadow-sm);transition:transform .16s cubic-bezier(.22,1,.36,1),box-shadow .16s,border-color .16s}.todo-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.todo-card__head{display:flex;align-items:center;justify-content:space-between;gap:12px}.todo-card__subject{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-faint);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.todo-card__title{font-size:17px;font-weight:600;line-height:1.28;letter-spacing:-.015em}.todo-card__excerpt{font-size:13.5px;line-height:1.55;color:var(--ink-soft);display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.todo-card__cta{margin-top:3px;font-size:13px;font-weight:700;color:var(--tab)}.binder{display:grid;grid-template-columns:repeat(auto-fill,minmax(184px,1fr));gap:22px 26px;padding:6px 12px 14px 0}.tab-card{position:relative;display:flex;flex-direction:column;min-height:194px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);overflow:visible;box-shadow:5px 5px 0 -1px var(--surface),5px 5px 0 0 var(--line),10px 10px 0 -1px var(--surface),10px 10px 0 0 var(--line),var(--shadow-sm);transition:transform .18s cubic-bezier(.22,1,.36,1),box-shadow .18s}.tab-card:hover{transform:translate(-3px,-3px);box-shadow:7px 7px 0 -1px var(--surface),7px 7px 0 0 var(--line),14px 14px 0 -1px var(--surface),14px 14px 0 0 var(--line),var(--shadow-lg)}.tab-card__tab{position:absolute;top:-7px;right:20px;width:42px;height:9px;border-radius:3px 3px 0 0;background:var(--tab)}.tab-card__cover{display:flex;align-items:center;justify-content:center;height:78px;border-radius:calc(var(--r-md) - 1px) calc(var(--r-md) - 1px) 0 0;background:color-mix(in srgb,var(--tab) 14%,var(--surface));border-bottom:2px solid var(--tab)}.tab-card__emoji{font-size:32px;line-height:1}.tab-card__body{display:flex;flex-direction:column;gap:3px;padding:13px 15px 15px;flex:1}.tab-card__name{font-family:var(--font-display);font-size:16.5px;font-weight:600;line-height:1.22;letter-spacing:-.015em}.tab-card__meta{font-size:12.5px;color:var(--ink-faint)}.tab-card__flag{margin-top:auto;padding-top:8px;font-size:11.5px;font-weight:700;color:var(--success)}.tab-card--new{gap:11px;padding:20px 15px 15px;min-height:194px;border-style:dashed;border-color:var(--line-strong);box-shadow:none}.tab-card--new:hover{transform:none;box-shadow:none}.picker{display:flex;flex-wrap:wrap;gap:5px}.picker__emoji{width:27px;height:27px;display:grid;place-items:center;border:1px solid transparent;border-radius:var(--r-sm);background:var(--surface-sunk);font-size:14px;cursor:pointer;transition:border-color .12s,transform .12s}.picker__emoji:hover{transform:scale(1.12)}.picker__emoji.is-on{border-color:var(--primary);background:var(--primary-tint)}.picker__color{width:20px;height:20px;border-radius:50%;border:2px solid transparent;cursor:pointer;transition:transform .12s,box-shadow .12s}.picker__color:hover{transform:scale(1.15)}.picker__color.is-on{box-shadow:0 0 0 2px var(--surface),0 0 0 4px currentColor;transform:scale(1.1)}.ready-list{display:flex;flex-direction:column;gap:8px}.ready-row{display:flex;align-items:center;gap:14px;padding:13px 18px 13px 0;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;transition:border-color .15s,transform .15s,box-shadow .15s}.ready-row:hover{border-color:var(--line-strong);transform:translate(4px);box-shadow:var(--shadow-sm)}.ready-row__bar{width:5px;align-self:stretch;flex:none;background:var(--tab)}.ready-row__body{display:flex;flex-direction:column;gap:1px;flex:1;min-width:0}.ready-row__title{font-weight:600;font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.ready-row__sub{font-size:12.5px}.ready-row__go{flex:none;font-size:17px;color:var(--ink-faint);transition:transform .15s,color .15s}.ready-row:hover .ready-row__go{color:var(--tab);transform:translate(3px)}.dash-empty{display:grid;place-items:center;gap:14px;text-align:center;padding:clamp(40px,6vw,64px) 24px;border:1.5px dashed var(--line-strong);border-radius:var(--r-lg)}.dash-empty h3{font-size:21px}.dash-empty p{max-width:44ch;font-size:14.5px;line-height:1.6}.dash-empty__stack{position:relative;width:62px;height:74px;margin-bottom:6px}.dash-empty__stack span{position:absolute;top:0;right:0;bottom:0;left:0;background:var(--surface);border:1px solid var(--line-strong);border-radius:5px}.dash-empty__stack span:nth-child(1){transform:rotate(-8deg) translate(-5px,3px)}.dash-empty__stack span:nth-child(2){transform:rotate(4deg) translate(4px,1px)}.dash-empty__stack span:nth-child(3){border-left:4px solid var(--primary)}:root{--nb-blue: #3b82f6;--nb-blue-bg: #eef4ff;--nb-teal: #0d9488;--nb-teal-bg: #e4f6f4;--nb-slate: #64748b;--nb-slate-bg: #f1f4f8;--nb-paper: var(--surface)}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--nb-blue: #7ba9ff;--nb-blue-bg: #182741;--nb-teal: #2dd4bf;--nb-teal-bg: #10332f;--nb-slate: #94a3b8;--nb-slate-bg: #1e2532}}:root[data-theme=dark]{--nb-blue: #7ba9ff;--nb-blue-bg: #182741;--nb-teal: #2dd4bf;--nb-teal-bg: #10332f;--nb-slate: #94a3b8;--nb-slate-bg: #1e2532}.nb-layout{display:grid;grid-template-columns:minmax(0,1fr) 208px;gap:34px;align-items:start}.nb-layout--full{grid-template-columns:minmax(0,1fr)}.nb-side{position:sticky;top:86px}@media(max-width:1000px){.nb-layout{grid-template-columns:1fr;gap:20px}.nb-side{position:static;order:-1}}.nb-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:12px;font-size:13px;color:var(--ink-faint)}.nb-meta__item{font-weight:600}.nb-meta__dot{width:3px;height:3px;border-radius:50%;background:var(--line-strong)}.nb-actions{display:flex;gap:10px;margin-top:16px}.modeswitch{display:inline-flex;padding:2px;border-radius:var(--r-full);background:var(--surface-sunk);border:1px solid var(--line)}.modeswitch__btn{padding:5px 13px;border:none;border-radius:var(--r-full);background:transparent;font-size:12.5px;font-weight:600;color:var(--ink-faint);cursor:pointer;transition:background .14s,color .14s}.modeswitch__btn:hover{color:var(--ink)}.modeswitch__btn.is-on{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-sm)}.nb{position:relative;padding:clamp(28px,4vw,48px) clamp(22px,3.5vw,46px) clamp(32px,4vw,52px) clamp(34px,5vw,62px);background:var(--nb-paper);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-md);font-family:var(--font-display);font-size:16.5px;line-height:1.78;color:var(--ink)}.nb:before{content:"";position:absolute;top:18px;bottom:18px;left:clamp(18px,2.8vw,34px);width:1.5px;background:color-mix(in srgb,var(--danger) 28%,transparent)}.nb--empty{font-family:var(--font-ui);text-align:center;padding-block:56px}.nb--empty:before{display:none}.nb__title{font-size:clamp(23px,3.2vw,30px);font-weight:700;letter-spacing:-.022em;line-height:1.2;margin-bottom:26px;padding-bottom:14px;border-bottom:2px solid var(--tab, var(--primary))}.nb__h1{display:flex;align-items:baseline;gap:11px;font-size:clamp(18px,2.3vw,21px);font-weight:700;letter-spacing:-.012em;line-height:1.3;margin-top:38px;margin-bottom:12px}.nb__h1:first-child{margin-top:0}.nb__h2{display:flex;align-items:baseline;gap:9px;font-size:16.5px;font-weight:600;line-height:1.35;margin-top:26px;margin-bottom:8px;color:var(--ink-soft)}.nb__num{display:inline-grid;place-items:center;min-width:27px;height:27px;padding-inline:7px;flex:none;border-radius:var(--r-sm);background:var(--tab, var(--primary));color:#fff;font-family:var(--font-ui);font-size:12.5px;font-weight:700;letter-spacing:.01em;transform:translateY(-1px)}.nb__num--sub{min-width:22px;height:22px;font-size:11px;background:transparent;color:var(--tab, var(--primary));border:1.5px solid currentColor}.nb__p{margin-bottom:14px;max-width:68ch;color:var(--ink-soft)}.nb__p strong{color:var(--ink);font-weight:700}.nb-code{font-family:ui-monospace,SFMono-Regular,Cascadia Mono,Menlo,monospace;font-size:.9em;padding:1px 6px;border-radius:5px;background:var(--surface-sunk);color:var(--ink)}.nb__list{list-style:none;padding:0;margin:0 0 16px;max-width:68ch;display:flex;flex-direction:column;gap:8px;counter-reset:nb-item}.nb__list li{position:relative;padding-left:25px;color:var(--ink-soft)}.nb__list li:before{content:"";position:absolute;left:6px;top:.72em;width:6px;height:6px;border-radius:50%;background:var(--tab, var(--primary))}.nb__list--ordered li{counter-increment:nb-item;padding-left:31px}.nb__list--ordered li:before{content:counter(nb-item) ".";left:0;top:0;width:auto;height:auto;border-radius:0;background:none;color:var(--tab, var(--primary));font-family:var(--font-ui);font-size:13.5px;font-weight:700}.nb__list strong{color:var(--ink)}.nb__formula{margin:20px 0;padding:16px 22px;border-radius:var(--r-md);background:var(--surface-sunk);border-left:3px solid var(--tab, var(--primary));font-size:clamp(17px,2.2vw,19.5px);font-weight:700;letter-spacing:.025em;text-align:center;color:var(--ink);overflow-x:auto}.nb__callout{--c: var(--primary);--c-bg: var(--primary-tint);margin:20px 0;padding:16px 20px;border-radius:var(--r-md);background:var(--c-bg);border-left:3px solid var(--c);max-width:68ch}.nb__callout p{font-size:15.5px;line-height:1.68;color:var(--ink-soft)}.nb__callout p+p{margin-top:8px}.nb__callout strong{color:var(--ink)}.nb__callout-formula{font-weight:700;letter-spacing:.02em;color:var(--ink)!important;padding-left:14px;border-left:2px solid color-mix(in srgb,var(--c) 45%,transparent);margin-top:5px!important;overflow-x:auto}.nb__callout-label{display:block;margin-bottom:6px;font-family:var(--font-ui);font-size:10.5px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--c)}.nb__callout--definition{--c: var(--primary);--c-bg: var(--primary-tint)}.nb__callout--theorem{--c: var(--nb-blue);--c-bg: var(--nb-blue-bg)}.nb__callout--property{--c: var(--nb-teal);--c-bg: var(--nb-teal-bg)}.nb__callout--example{--c: var(--success);--c-bg: var(--success-tint)}.nb__callout--method{--c: #b45309;--c-bg: var(--accent-tint)}.nb__callout--warning{--c: var(--danger);--c-bg: var(--danger-tint)}.nb__callout--note{--c: var(--nb-slate);--c-bg: var(--nb-slate-bg)}@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .nb__callout--method{--c: var(--accent)}}:root[data-theme=dark] .nb__callout--method{--c: var(--accent)}.toc{display:flex;flex-direction:column;gap:9px}.toc__label{font-size:10.5px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint);padding-left:11px}.toc__list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:1px;border-left:2px solid var(--line)}.toc__link{display:flex;align-items:baseline;gap:7px;width:100%;padding:6px 10px;margin-left:-2px;border:none;border-left:2px solid transparent;background:transparent;text-align:left;font-size:13px;line-height:1.4;color:var(--ink-faint);cursor:pointer;transition:color .14s,border-color .14s}.toc__link:hover{color:var(--ink)}.toc__link.is-active{color:var(--tab, var(--primary));border-left-color:var(--tab, var(--primary));font-weight:600}.toc__link--sub{padding-left:22px;font-size:12.5px}.toc__num{flex:none;font-weight:700;font-size:11.5px;opacity:.75}@media(max-width:1000px){.toc{padding:14px 16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md)}.toc__list{flex-direction:row;flex-wrap:wrap;gap:6px;border-left:none}.toc__link{width:auto;margin-left:0;padding:5px 11px;border-left:none;border-radius:var(--r-full);background:var(--surface-sunk)}.toc__link.is-active{background:var(--tab, var(--primary));color:#fff}.toc__link--sub{padding-left:11px}}.nbedit{display:flex;flex-direction:column;gap:12px}.nbedit__bar{display:flex;align-items:center;gap:10px;padding:7px 9px;background:var(--surface-sunk);border:1px solid var(--line);border-radius:var(--r-md)}.nbedit__tools{display:flex;align-items:center;gap:3px;flex-wrap:wrap}.nbedit__tool{min-width:32px;height:30px;padding-inline:8px;display:grid;place-items:center;border:1px solid transparent;border-radius:var(--r-sm);background:transparent;font-size:13px;font-weight:600;color:var(--ink-soft);cursor:pointer;transition:background .14s,color .14s,border-color .14s}.nbedit__tool:hover{background:var(--surface);border-color:var(--line-strong);color:var(--ink)}.nbedit__sep{width:1px;height:19px;background:var(--line-strong);margin-inline:5px}.nbedit__toggle{padding:6px 14px;border:1px solid var(--line-strong);border-radius:var(--r-full);background:var(--surface);font-size:13px;font-weight:600;color:var(--ink-soft);cursor:pointer;transition:background .14s,color .14s,border-color .14s}.nbedit__toggle:hover{color:var(--ink)}.nbedit__toggle.is-on{background:var(--primary);border-color:var(--primary);color:#fff}.nbedit__area{width:100%;min-height:460px;padding:24px 26px;background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--r-lg);font-family:var(--font-ui);font-size:15px;line-height:1.85;color:var(--ink);resize:vertical;transition:border-color .15s,box-shadow .15s}.nbedit__area:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-ring)}.nbedit__preview{min-height:460px}.nbedit__foot{display:flex;align-items:center;gap:10px;flex-wrap:wrap}@media(max-width:620px){.nbedit__hint{display:none}}@media print{.topbar,.tabbar,.tabs,.nb-side,.nb-meta,.nb-actions,.danger-zone,.backlink,.review-banner{display:none!important}.page{padding:0}.nb,.sheet{border:none;box-shadow:none;padding:0}.nb:before{display:none}.nb__callout,.nb__formula{break-inside:avoid}.nb__h1,.nb__h2{break-after:avoid}}.pager{position:relative;display:flex;flex-direction:column;align-items:center;gap:16px}.pager__measure-wrap{position:absolute;top:0;left:0;width:0;height:0;overflow:hidden;visibility:hidden;pointer-events:none}.pager__measure{width:calc(var(--nb-page-w) - var(--nb-page-pad) * 2);padding:0;border:0;border-radius:0;background:none;box-shadow:none}.pager__measure:before{content:none}.pager__loading{display:grid;place-items:center;min-height:50vh;width:100%}.pager__stage{display:flex;justify-content:center;gap:var(--nb-spine);width:100%;perspective:2200px}.pager__stage--spread .nbpage:first-child{border-top-right-radius:3px;border-bottom-right-radius:3px}.pager__stage--spread .nbpage:last-child{border-top-left-radius:3px;border-bottom-left-radius:3px}.pager__stage--spread .nbpage:first-child:after,.pager__stage--spread .nbpage:last-child:after{content:"";position:absolute;top:0;bottom:0;width:26px;pointer-events:none}.pager__stage--spread .nbpage:first-child:after{right:0;background:linear-gradient(to right,transparent,rgba(26,24,38,.07))}.pager__stage--spread .nbpage:last-child:after{left:0;background:linear-gradient(to left,transparent,rgba(26,24,38,.07))}.nbpage{position:relative;display:flex;flex-direction:column;flex:none;width:var(--nb-page-w);height:calc(var(--nb-page-h) + var(--nb-page-pad) * 2 + var(--nb-page-header) + var(--nb-page-gap) + var(--nb-page-footer));padding:var(--nb-page-pad);background:var(--nb-paper);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow-lg);overflow:hidden;transform-style:preserve-3d}.nbpage:before{content:"";position:absolute;top:16px;bottom:16px;left:calc(var(--nb-page-pad) - 16px);width:1.5px;background:color-mix(in srgb,var(--danger) 26%,transparent)}.nbpage--blank{background:color-mix(in srgb,var(--nb-paper) 55%,transparent);border-style:dashed;box-shadow:none}.nbpage--blank:before{content:none}.nbpage__head{height:var(--nb-page-header);display:flex;align-items:flex-start;border-bottom:1px solid var(--line);margin-bottom:var(--nb-page-gap)}.nbpage__title{font-family:var(--font-ui);font-size:10.5px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--ink-faint);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nbpage__body{height:var(--nb-page-h);overflow:hidden}.nbpage__foot{height:var(--nb-page-footer);display:flex;align-items:flex-end;justify-content:center;margin-top:auto}.nbpage__num{font-family:var(--font-display);font-size:12.5px;font-weight:600;color:var(--ink-faint)}.nbpage__body>:first-child{margin-top:0!important}@keyframes page-turn-next{0%{opacity:0;transform:translate(22px) rotateY(-7deg)}to{opacity:1;transform:none}}@keyframes page-turn-prev{0%{opacity:0;transform:translate(-22px) rotateY(7deg)}to{opacity:1;transform:none}}.nbpage.is-turning-next{animation:page-turn-next .3s cubic-bezier(.22,1,.36,1) both}.nbpage.is-turning-prev{animation:page-turn-prev .3s cubic-bezier(.22,1,.36,1) both}.pager__nav{display:flex;align-items:center;gap:10px}.pager__arrow{width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--line-strong);border-radius:50%;background:var(--surface);font-size:22px;line-height:1;color:var(--ink-soft);cursor:pointer;transition:background .14s,color .14s,border-color .14s,opacity .14s}.pager__arrow:hover:not(:disabled){background:var(--primary);border-color:var(--primary);color:#fff}.pager__arrow:disabled{opacity:.35;cursor:not-allowed}.pager__counter{min-width:96px;padding:8px 16px;border:1px solid var(--line-strong);border-radius:var(--r-full);background:var(--surface);font-size:14px;font-weight:700;color:var(--ink);cursor:pointer;transition:border-color .14s}.pager__counter:hover{border-color:var(--primary)}.pager__hint{text-align:center}@media(max-width:720px){.pager__hint{display:none}}.overview{width:100%;display:flex;flex-direction:column;gap:18px}.overview__head{display:flex;align-items:center;justify-content:space-between;gap:16px}.overview__grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(158px,1fr));gap:18px}.thumb{display:flex;flex-direction:column;align-items:center;gap:7px;padding:0;border:none;background:none;cursor:pointer}.thumb__paper{position:relative;display:block;width:100%;aspect-ratio:1 / 1.414;overflow:hidden;background:var(--nb-paper);border:1px solid var(--line);border-radius:7px;box-shadow:var(--shadow-sm);transition:border-color .14s,box-shadow .14s,transform .14s}.thumb:hover .thumb__paper{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--line-strong)}.thumb.is-active .thumb__paper{border-color:var(--tab, var(--primary));box-shadow:0 0 0 2px var(--tab, var(--primary))}.thumb__scale{position:absolute;top:0;left:0;display:block;width:calc(var(--nb-page-w) - var(--nb-page-pad) * 2);padding:0;border:0;background:none;box-shadow:none;transform-origin:top left;transform:scale(calc(158 / var(--nb-page-wn)))}.thumb__scale:before{content:none}.thumb__num{font-size:12.5px;font-weight:600;color:var(--ink-faint)}.thumb.is-active .thumb__num{color:var(--tab, var(--primary))}@media print{.pager__nav,.pager__hint,.pager__measure-wrap{display:none!important}.nbpage{box-shadow:none;border:none;break-inside:avoid}}.searchbtn{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border:1px solid var(--line-strong);border-radius:var(--r-full);background:var(--surface);font-size:13.5px;color:var(--ink-faint);cursor:pointer;transition:border-color .14s,color .14s}.searchbtn:hover{border-color:var(--primary);color:var(--ink)}.searchbtn__kbd,.palette__kbd{padding:1px 6px;border:1px solid var(--line-strong);border-radius:5px;background:var(--surface-sunk);font-family:var(--font-ui);font-size:11px;font-weight:600;color:var(--ink-faint)}@media(max-width:860px){.searchbtn__label,.searchbtn__kbd{display:none}.searchbtn{padding:7px 10px;font-size:16px}}.palette-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:flex;justify-content:center;padding:clamp(56px,12vh,130px) 18px 18px;background:color-mix(in srgb,var(--ink) 34%,transparent);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);animation:fade-up .16s ease both}.palette{width:100%;max-width:620px;max-height:70vh;display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--r-lg);box-shadow:var(--shadow-lg);overflow:hidden}.palette__field{display:flex;align-items:center;gap:11px;padding:15px 18px;border-bottom:1px solid var(--line)}.palette__icon{font-size:19px;color:var(--ink-faint);line-height:1}.palette__input{flex:1;border:none;background:none;font-size:16px;color:var(--ink)}.palette__input:focus{outline:none}.palette__input::placeholder{color:var(--ink-faint)}.palette__results{overflow-y:auto;padding:6px}.palette__empty,.palette__hint{padding:18px;font-size:14px;color:var(--ink-soft)}.palette__hit{display:flex;align-items:flex-start;gap:11px;width:100%;padding:11px 13px;border:none;border-radius:var(--r-md);background:none;text-align:left;cursor:pointer}.palette__hit.is-active{background:var(--surface-sunk)}.palette__dot{width:8px;height:8px;margin-top:6px;border-radius:50%;flex:none;background:var(--tab)}.palette__body{display:flex;flex-direction:column;gap:2px;min-width:0}.palette__title{font-size:14.5px;font-weight:600;color:var(--ink)}.palette__sub{font-size:12.5px}.palette__excerpt{margin-top:3px;font-size:12.5px;line-height:1.5;color:var(--ink-soft);display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.sheet__tools{display:flex;gap:9px;flex-wrap:wrap;margin-bottom:22px;padding-bottom:18px;border-bottom:1px solid var(--line)}.cards{display:flex;flex-direction:column;align-items:center;gap:18px}.cards__head{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;max-width:560px}.cards__count{font-size:13px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--ink-faint)}.card3d{width:100%;max-width:560px;aspect-ratio:8 / 5;padding:0;border:none;background:none;cursor:pointer;perspective:1400px}.card3d__inner{position:relative;display:block;width:100%;height:100%;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.22,1,.36,1)}.card3d.is-flipped .card3d__inner{transform:rotateY(180deg)}.card3d__face{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:clamp(24px,5vw,44px);border-radius:var(--r-lg);border:1px solid var(--line);box-shadow:var(--shadow-lg);backface-visibility:hidden;text-align:center}.card3d__face--front{background:var(--surface)}.card3d__face--back{transform:rotateY(180deg);background:linear-gradient(150deg,var(--primary-tint),var(--surface) 70%)}.card3d__label{font-size:10.5px;font-weight:800;letter-spacing:.11em;text-transform:uppercase;color:var(--ink-faint)}.card3d__term{font-family:var(--font-display);font-size:clamp(24px,5vw,36px);font-weight:700;letter-spacing:-.025em;line-height:1.15;color:var(--ink)}.card3d__def{font-size:clamp(15px,2.2vw,18px);line-height:1.6;color:var(--ink);max-width:42ch}.card3d__hint{position:absolute;bottom:18px;font-size:12px;color:var(--ink-faint)}.cards__actions{display:flex;gap:11px;animation:fade-up .22s ease both}.cards__prompt{text-align:center}.cards__done{display:grid;place-items:center;gap:11px;text-align:center;padding:clamp(34px,6vw,56px) 24px;width:100%;max-width:560px;border-radius:var(--r-lg);border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow-sm)}.cards__done h3{font-size:21px}.cards__done-icon{font-size:38px;line-height:1}@media(prefers-reduced-motion:reduce){.card3d__inner{transition:none}}@media print{.sheet__tools{display:none!important}}