:root{--grade-green:#19685b;--grade-wash:#edf3eb;--grade-line:#d7e2dc}body{background-color:#f8f8f3;background-size:32px 32px,32px 32px,auto}.container{max-width:1200px}html{scroll-padding-top:90px}.skip{position:absolute;left:12px;top:-80px;background:white;padding:12px;z-index:100}.skip:focus{top:10px}.site-header .site-nav{font-size:14px}.grade-hero{display:grid;grid-template-columns:1fr 1.15fr;gap:45px;align-items:center;padding:62px 0 48px}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:11px;font-weight:700;color:var(--grade-green)}.grade-hero h1{font-size:clamp(30px,3.5vw,45px);line-height:1.18;letter-spacing:-.025em}.grade-hero .lead{font-size:21px;line-height:1.6}.grade-hero .actions{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0}.small{font-size:13px;color:var(--ink-soft);line-height:1.6}.hero-preview{background:#fff;border:1px solid var(--grade-line);border-radius:20px;padding:20px;box-shadow:0 12px 35px #19363c09}.preview-heading{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:12px}.preview-heading .eyebrow{margin:0}.silent{font-size:11px;white-space:nowrap;color:var(--ink-soft)}.hero-preview video{display:block;width:100%;aspect-ratio:16/9;border-radius:12px;background:#183d3a}.hero-preview p{font-size:13px;color:var(--ink-soft);margin:12px 0}.hero-preview>a{font-size:14px;font-weight:700}.section-block{padding:36px 0}.section-heading{max-width:740px;margin-bottom:23px}.section-heading h2{font-size:clamp(25px,3vw,34px)}.section-heading>p:last-child{color:var(--ink-soft)}.subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.subject-card{position:relative;border:1px solid var(--grade-line);border-radius:18px;padding:28px;background:white;display:flex;flex-direction:column;min-width:0}.subject-card h3{font-size:26px;line-height:1.25}.subject-card>.eyebrow{padding-right:20px}.subject-card .number{position:absolute;right:20px;top:23px;font:18px Georgia,serif;color:#83938b}.subject-card .formula{font:36px/1.3 Georgia,serif;letter-spacing:-.02em;margin:20px 0;color:var(--grade-green);min-height:70px;display:flex;align-items:center;white-space:nowrap}.subject-card svg{height:70px;width:100%;margin:20px 0;color:#406b90}.subject-card>.btn{margin-top:auto;text-align:center}.subject-card>.small{margin-top:14px;margin-bottom:0}.algebra{border-top:4px solid var(--grade-green)}.geometry{border-top:4px solid #406b90}.foundations{border-top:4px solid #b08342}.small-links{display:flex;gap:16px;flex-wrap:wrap;margin-top:15px;font-size:13px}.geometry-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.topic-card{background:white;border:1px solid var(--grade-line);border-radius:16px;padding:23px;min-width:0}.topic-card h3{font-size:21px}.topic-card ul{padding-left:18px;margin-bottom:10px;font-size:15px}.topic-card li{margin:12px 0}.video-link{font-size:14px;font-weight:700}.video-library{background:var(--grade-wash);border:1px solid var(--grade-line);border-radius:20px;padding:30px;margin:20px 0}.video-topics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.video-topics a{display:flex;align-items:center;background:white;border:1px solid #d4e0d5;border-radius:10px;padding:14px;min-height:52px;text-decoration:none;font-size:14px;color:var(--ink)}.video-topics a:hover{background:#f8fbf7;border-color:var(--grade-green)}.study-cycle{list-style:none;counter-reset:step;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;margin:30px 0}.study-cycle li{counter-increment:step}.study-cycle li:before{content:counter(step);display:grid;place-items:center;width:34px;height:34px;background:var(--grade-green);color:white;border-radius:50%;font-weight:700;margin-bottom:14px}.study-cycle b{display:block;font-size:18px;margin-bottom:7px}.study-cycle span{font-size:15px;color:var(--ink-soft)}.study-options{display:grid;grid-template-columns:1fr 1fr;gap:18px}.progress-note{border-left:3px solid var(--grade-green);padding:10px 22px;margin:28px 0;font-size:14px;max-width:900px}.progress-note h3{font-size:19px}.grade-footer{border-top:1px solid var(--grade-line);padding-top:24px;padding-bottom:35px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:14px}.grade-footer nav{display:flex;gap:20px;flex-wrap:wrap}.btn{min-height:44px}.btn,.video-topics a,.site-nav a{overflow-wrap:anywhere}
@media(max-width:980px){.grade-hero{gap:24px}.subject-grid{grid-template-columns:1fr}.subject-card .formula,.subject-card svg{max-width:300px}.subject-card>.btn{align-self:flex-start}.geometry-grid{grid-template-columns:1fr 1fr}.video-topics{grid-template-columns:1fr 1fr}.study-cycle{grid-template-columns:1fr 1fr}.subject-card{padding:25px}.subject-card h3 br{display:none}}
@media(max-width:680px){.container{padding-left:18px;padding-right:18px}.site-header{position:static}.site-header .container{gap:6px 18px;padding-top:12px;padding-bottom:12px}.site-nav{margin-left:0}.site-nav a{font-size:13px}.grade-hero{grid-template-columns:1fr;padding:30px 0 20px;gap:24px}.grade-hero h1{font-size:34px}.grade-hero .lead{font-size:19px}.grade-hero .actions{display:flex;flex-wrap:wrap;gap:10px}.hero-preview{padding:16px}.section-block{padding-top:25px;padding-bottom:25px}.geometry-grid,.video-topics,.study-options{grid-template-columns:1fr}.video-library{padding:22px 18px}.subject-card .formula{font-size:33px}.study-cycle{gap:24px 18px}.study-cycle b{font-size:16px}.study-cycle span{font-size:14px}.grade-footer{display:block}.grade-footer nav{gap:12px 20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.practice-filters{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.practice-filters button{font:inherit;font-size:15px;border:1px solid var(--grade-line);border-radius:99px;min-height:44px;padding:9px 16px;background:#fff;color:var(--ink);cursor:pointer}.practice-filters button[aria-pressed=true]{background:var(--grade-green);border-color:var(--grade-green);color:#fff}.practice-filters button:focus-visible,.practice-actions a:focus-visible{outline:3px solid #b08342;outline-offset:3px}.practice-strand{scroll-margin-top:100px;margin:28px 0}.practice-strand[hidden]{display:none}.practice-strand>h3{font-size:26px;margin-bottom:6px}.practice-strand>.small{margin-top:0}.practice-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.practice-card{display:flex;flex-direction:column;padding:22px;background:#fff;border:1px solid var(--grade-line);border-radius:14px;min-width:0}.practice-card h4{font-size:18px;line-height:1.35;margin:0 0 12px}.practice-card p{font-size:14px;color:var(--ink-soft);margin:0 0 16px}.practice-actions{display:flex;flex-direction:column;gap:12px;margin-top:auto;font-size:14px}.practice-primary{font-weight:700}.practice-preview{color:var(--ink-soft)}.new-video-heading{font-size:22px;margin-top:30px}.practice-actions a{min-height:32px;display:flex;align-items:center;overflow-wrap:anywhere}
@media(max-width:980px){.practice-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.practice-grid{grid-template-columns:1fr}.practice-card{padding:20px}.practice-strand{scroll-margin-top:20px}}

.pre7-intro{display:grid;grid-template-columns:1.2fr 1fr;gap:36px;background:#edf3eb;border:1px solid var(--grade-line);border-radius:20px;padding:32px;margin:12px 0 30px}.pre7-intro h2{font-size:clamp(26px,3vw,34px);line-height:1.2;margin-top:10px}.pre7-intro p{line-height:1.7}.pre7-steps{display:flex;flex-direction:column;gap:18px;padding-left:24px;align-self:center}.pre7-steps b,.pre7-steps span{display:block}.pre7-steps span{font-size:14px;line-height:1.6;color:var(--ink-soft);margin-top:5px}.practice-video{color:var(--grade-green)}
@media(max-width:680px){.pre7-intro{grid-template-columns:1fr;padding:22px;gap:8px}.pre7-intro h2 br{display:none}}