.math-hero{grid-template-columns:.72fr 34px 1.6fr;gap:24px;align-items:center}.hero-source{align-self:center}.hero-destination{padding-right:9px}.hero-transfer{align-self:center}.destination-label{align-items:center;margin-bottom:22px}.destination-label>b{font-size:14px}.page-deck{position:relative;isolation:isolate;aspect-ratio:.97;max-width:720px;margin:0 auto 14px}.page-card{font-family:inherit;position:absolute;width:80%;padding:0;border:1px solid #ccd2df;border-radius:3px;background:#fff;cursor:pointer;box-shadow:0 12px 34px #25304b20;transition:transform .5s cubic-bezier(.2,.75,.2,1),box-shadow .4s;transform-origin:50% 80%;text-align:left}.page-card img{display:block;width:100%;height:auto;pointer-events:none}.page-card.is-front{z-index:2;transform:translate(1%,0) rotate(-1deg);cursor:zoom-in}.page-card.is-back{z-index:1;transform:translate(23%,5%) rotate(4deg);box-shadow:0 7px 22px #25304b18}.page-card.is-back:hover{transform:translate(26%,3%) rotate(5deg)}.page-card:focus-visible{outline:3px solid var(--accent);outline-offset:5px}.deck-page-label{display:flex;justify-content:space-between;gap:8px;padding:11px 15px;border-bottom:1px solid #e1e5ee;font-weight:650;font-size:13px;color:var(--accent-ink);background:#f5f7fb}.deck-page-label span{font-size:12px;font-weight:400;color:var(--ink-2)}.deck-corner{position:absolute;bottom:12px;right:13px;font:600 12px var(--sans);color:var(--accent-ink);background:#edf1fc;padding:6px 9px;border-radius:4px}.deck-toolbar{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--ink-2);position:relative;z-index:3;margin-top:28px}.deck-pagination{display:flex;gap:4px;flex-shrink:0}.deck-pagination button,.deck-next{font:600 12px var(--sans);padding:8px 11px;border:1px solid var(--rule);border-radius:5px;background:var(--paper);color:var(--ink-2);cursor:pointer}.deck-pagination button[aria-pressed=true]{background:var(--accent-soft);color:var(--accent-ink);border-color:#bec7ef}.deck-next{font-size:19px;padding:1px 11px;margin-left:auto}.hero-evidence{font-size:11px}.mode-one{padding:48px 0;border-top:1px solid var(--rule)}.mode-one-grid{grid-template-columns:1fr 1fr;gap:70px}.mode-one-grid h2{font-size:27px}.mode-one-grid .pair{max-width:460px;margin-left:auto}.mode-one-grid .page,.mode-one-grid .page img{max-height:235px}.mode-one-grid .cap{font-size:10px}.mode-three{padding-bottom:65px}.mode-three .benefits{margin-bottom:0}img.zoom:focus-visible{outline:3px solid var(--accent);outline-offset:4px}
@media(max-width:960px){.math-hero{gap:15px;grid-template-columns:.7fr 22px 1.6fr}.deck-toolbar{flex-wrap:wrap;margin-top:35px;gap:9px}.deck-toolbar>span{font-size:11px}.mode-one-grid{gap:35px}}
@media(max-width:720px){.math-hero{grid-template-columns:1fr;gap:22px}.hero-source{max-width:240px}.hero-destination{padding-right:12px}.page-deck{aspect-ratio:.94}.destination-label{margin-bottom:18px}.deck-toolbar{margin-top:26px}.deck-page-label{padding:8px;font-size:12px}.deck-page-label span{font-size:10px}.mode-one-grid{grid-template-columns:1fr;gap:25px}.mode-one-grid .pair{max-width:460px;margin:0}.mode-one-grid h2{font-size:26px}}
.page-deck{aspect-ratio:.76;max-width:620px}
@media(prefers-reduced-motion:reduce){.page-card{transition:none}}
/* MathLine: clearly marked live input and illustrated feature cards. */
.ml .head{gap:32px}.ml .head h2{font-size:clamp(25px,2.65vw,36px);letter-spacing:-.045em}.ml .head .sub{line-height:1.85}
.math-playground{min-width:0;width:92%;justify-self:center;padding:0}
.math-try-heading{margin-bottom:18px}.math-live{display:inline-flex;align-items:center;gap:7px;color:var(--accent-ink);font-size:13px;font-weight:700;margin-bottom:9px}.math-live::before{content:'';width:7px;height:7px;border-radius:50%;background:var(--accent)}
.math-try-heading h3{font-size:23px;line-height:1.4;letter-spacing:-.04em}.math-try-heading p{font-size:13px;color:var(--ink-2);margin-top:7px}
.math-playground .panel{border-radius:10px;box-shadow:none}.math-playground .panel .ph{padding:12px}.math-playground .panel .ph .chip{font-size:10px}
.math-input{margin:4px 12px 0;padding:12px;border:2px solid #83a9ff;border-radius:9px;background:#f1f5ff;color:#18366e;transition:box-shadow .15s}
.math-input:focus-within{border-color:#a5c1ff;box-shadow:0 0 0 3px #729bff40}.math-input label{display:flex;align-items:center;justify-content:space-between;font-size:13px;font-weight:700;cursor:text}.math-input label span{font-size:23px;line-height:1}
.math-playground .panel textarea{background:#fff;color:#172c51;border:1px solid #c8d7f5;border-radius:5px;padding:10px;height:86px;margin-top:9px;resize:vertical;line-height:1.65;font-size:13px;caret-color:#1d4fd8}.math-playground .panel textarea:focus-visible{outline:2px solid #1d4fd8;outline-offset:1px}
.math-input p{font-size:11px;margin-top:7px;color:#4c628a}.math-result-label{display:flex;justify-content:space-between;gap:8px;padding:0 12px;color:#e6e7ea;font-size:12px}.math-result-label span{color:#abb6c9;font-size:11px}.math-playground .panel .warn:empty{min-height:12px;padding:0}.math-playground .panel .pv{min-height:108px;margin-top:7px}.math-try-note{margin-top:12px;color:var(--ink-2);font-size:11px;text-align:center}
.math-features{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:36px;margin-top:40px;padding-top:28px;border-top:1px solid var(--ml-rule)}.math-features article{padding:0}.math-features h3{font-size:17px;letter-spacing:-.035em;margin:0 0 7px}.math-features p{font-size:13px;line-height:1.85;color:var(--ink-2)}
.math-feature-art{height:76px;box-sizing:border-box;margin-top:18px;padding:12px 18px;border-radius:8px;background:color-mix(in srgb,var(--paper) 70%,transparent);color:var(--accent-ink);display:flex;align-items:center;justify-content:flex-start;gap:18px}.syntax-art code{font:14px var(--mono)}.mini-fraction{display:flex;flex-direction:column;text-align:center;font:italic 23px/1.05 Georgia,serif;min-width:24px}.mini-fraction i:first-child{border-bottom:1px solid currentColor;padding-bottom:3px}.mini-fraction i:last-child{padding-top:3px}.baseline-art{gap:9px;position:relative}.baseline-art::after{content:'';position:absolute;left:18px;right:18px;top:48px;border-top:1px dashed var(--accent);opacity:.5}.baseline-art>span{font-size:11px}.baseline-art>i{font:italic 23px Georgia,serif}.edit-art{font:italic 23px Georgia,serif;gap:17px}.selected-equation{border:1px solid #7e9cdc;padding:5px 8px;position:relative}.selected-equation::after{content:'';position:absolute;width:5px;height:5px;background:var(--paper);border:1px solid #7e9cdc;bottom:-3px;right:-3px}.corrected-equation{display:flex;align-items:center}.edit-caret{height:25px;border-left:2px solid var(--accent);margin-left:4px}
@media(max-width:960px){.ml-grid{grid-template-columns:1fr}.math-playground{width:100%}.math-features article{padding:0}.math-feature-art{gap:10px}}
@media(max-width:720px){.math-features{grid-template-columns:1fr;gap:28px;padding-top:24px}.math-features article{display:block}.math-feature-art{height:68px;margin-top:14px;gap:12px;max-width:340px}.math-features h3{margin:0 0 5px;font-size:16px}.math-features p{font-size:12px}.syntax-art code{font-size:10px}.baseline-art{flex-wrap:wrap;align-content:center;gap:3px 6px}.baseline-art>span:last-child{display:none}.baseline-art::after{top:44px;left:18px;right:18px}.baseline-art>i{font-size:20px}.edit-art{font-size:15px;gap:5px}.selected-equation{padding:4px}.math-playground{padding:0}.math-try-heading h3{font-size:22px}.ml .head{gap:18px}}
/* Independent MathLine product identity. */
.ml .math-product-heading{margin-bottom:32px}
.ml .math-product-heading h2{font-size:clamp(48px,5.5vw,72px);font-weight:700;line-height:1.08;letter-spacing:-.045em;margin:0;color:var(--ml-ink)}
.ml .math-product-heading p{margin-top:12px;font-size:16px;line-height:1.6;color:var(--ml-ink2)}
.ml .math-product-lead{font-size:clamp(25px,2.65vw,36px);font-weight:700;line-height:1.4;letter-spacing:-.045em;color:var(--ml-ink);margin:0}
@media(max-width:720px){.ml .math-product-heading{margin-bottom:24px}.ml .math-product-heading p{font-size:14px}.ml .math-product-lead{font-size:25px}}
/* Product overview and the three IntoLine import modes. */
.product-overview{background:var(--paper);border-top:1px solid var(--rule);padding:64px 0}.product-overview .wrap{display:grid;grid-template-columns:.8fr 1.5fr;gap:48px;align-items:center}.product-overview-copy h2{font-size:26px;line-height:1.5;letter-spacing:-.04em}.product-overview-copy p{font-size:14px;color:var(--ink-2);line-height:1.9;margin-top:15px}.product-links{display:grid;grid-template-columns:1fr 1fr;gap:18px}.product-links>a{display:block;text-decoration:none;border:1px solid var(--rule-2);border-radius:14px;padding:26px;background:var(--ground);transition:border-color .15s,transform .15s}.product-links>a:last-child{background:var(--ml-bg)}.product-links>a:hover{border-color:var(--accent);transform:translateY(-3px)}.product-purpose{display:block;font-size:12px;color:var(--ink-2);margin-bottom:10px}.product-links strong{font-size:32px;letter-spacing:-.045em;line-height:1.2}.product-links p{font-size:13px;color:var(--ink-2);line-height:1.8;margin:12px 0 20px}.product-link-label{font-size:12px;color:var(--accent-ink);font-weight:600}
section.intoline-product{padding:80px 0 0;background:var(--ground);border-top:1px solid var(--rule)}.intoline-product-heading{margin-bottom:40px}.intoline-product-heading h2{font-size:clamp(48px,5.5vw,72px);font-weight:700;line-height:1.08;letter-spacing:-.045em;margin:0}.intoline-product-heading p{margin-top:12px;font-size:16px;color:var(--ink-2);line-height:1.6}.mode-intro{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:26px}.mode-intro h3{font-size:30px;line-height:1.4;letter-spacing:-.04em}.mode-intro p{font-size:14px;line-height:1.9;color:var(--ink-2)}.import-modes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.import-modes button{display:flex;flex-direction:column;align-items:flex-start;text-align:left;border:1px solid var(--rule-2);border-radius:12px;padding:24px;background:var(--paper);color:var(--ink);font-family:var(--sans);cursor:pointer;position:relative}.import-modes button[aria-selected=true]{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent);background:var(--accent-soft)}.import-modes button:focus-visible,.product-links a:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.mode-number{display:flex;align-items:center;gap:10px;color:var(--ink-2);font-size:12px;margin-bottom:16px}.mode-number em{font-style:normal;font-size:10px;border:1px solid var(--rule-2);padding:2px 7px;border-radius:4px}.import-modes strong{font-size:20px;letter-spacing:-.045em;line-height:1.4}.mode-description{font-size:14px;color:var(--ink-2);line-height:1.8;margin-top:12px}.mode-action{font-size:12px;margin-top:24px;color:var(--accent-ink);font-weight:600}.mode-shared{font-size:12px;color:var(--ink-2);margin-top:16px;line-height:1.8}.mode-panels{margin-top:36px;border-top:1px solid var(--rule-2)}.intoline-product .import-mode-panel{padding:48px 0 64px;background:transparent}.import-mode-panel[hidden]{display:none!important}.import-mode-panel .section-top h2,.import-mode-panel .head h2{font-size:30px}.import-mode-panel .section-top{margin-bottom:30px}.import-mode-panel .mode-tag{margin-bottom:22px}
@media(max-width:960px){.product-overview .wrap{grid-template-columns:1fr;gap:26px}.product-overview-copy{display:flex;justify-content:space-between;gap:24px}.product-overview-copy p{margin:0}.import-modes button{padding:18px}.import-modes strong{font-size:18px}}
@media(max-width:720px){.product-overview{padding:40px 0}.product-overview-copy{display:block}.product-overview-copy p{margin-top:14px}.product-links{grid-template-columns:1fr}.product-links>a{padding:22px}.product-links strong{font-size:30px}section.intoline-product{padding-top:48px}.intoline-product-heading p{font-size:14px}.mode-intro{display:block}.mode-intro h3{font-size:26px}.mode-intro p{margin-top:14px}.import-modes{grid-template-columns:1fr;gap:10px}.import-modes button{display:grid;grid-template-columns:1fr auto;gap:5px 12px;padding:17px}.mode-number{grid-column:1/-1;margin-bottom:4px}.import-modes strong{font-size:19px}.mode-description{grid-column:1;grid-row:3;font-size:12px;margin:0}.mode-description br{display:none}.mode-action{grid-column:2;grid-row:2/4;align-self:center;margin:0;font-size:11px}.mode-shared{font-size:11px}.intoline-product .import-mode-panel{padding:32px 0 44px}.import-mode-panel .section-top h2,.import-mode-panel .head h2{font-size:26px}}