:root{--ink:#24324f;--muted:#74819a;--purple:#6854eb;--line:#e5e7f1;--pale:#f1edff}*{box-sizing:border-box}body{margin:0;background:#fcfcff;color:var(--ink);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.65}a{color:inherit}button,a{ -webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible{outline:3px solid #ac9aff;outline-offset:4px}.site-header{max-width:1180px;margin:auto;padding:28px 36px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{text-decoration:none;font-size:27px;font-weight:800;letter-spacing:-1px}.brand span{color:var(--purple);font-weight:500}.site-header nav{display:flex;gap:28px;font-size:14px}.site-header nav a{text-decoration:none;font-weight:600}.site-main{max-width:1100px;margin:auto;padding:58px 36px 80px}.eyebrow{color:var(--purple);font-size:11px;font-weight:700;letter-spacing:2px;text-transform:uppercase}h1{font-size:clamp(36px,5vw,62px);letter-spacing:-2px;line-height:1.1;margin:22px 0}h2{font-size:28px;letter-spacing:-.8px;line-height:1.25}h3{font-size:20px;letter-spacing:-.3px}.lead{font-size:18px;max-width:600px;color:var(--muted)}.site-hero{display:grid;grid-template-columns:1.2fr 1fr;gap:70px;align-items:center;margin-bottom:70px}.button-row{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0}.button{display:inline-block;background:var(--purple);color:white;border:0;border-radius:12px;padding:13px 22px;text-decoration:none;font-size:14px;font-weight:650}.button.secondary{background:var(--pale);color:var(--purple)}.hero-preview{background:linear-gradient(145deg,#efeaff,#faf9ff);border:1px solid #e4ddfa;border-radius:26px;padding:30px;box-shadow:0 24px 50px #5c4aca0d;transform:rotate(2deg)}.hero-preview .mini-card{margin:20px 0;background:white;border-radius:14px;padding:24px}.hero-preview .mini-card p{font-size:14px;margin:8px 0}.check-banner{background:#e5f5e9;color:#34674e;border-radius:9px;padding:14px;font-size:14px;font-weight:650}.step{display:flex;gap:12px;font-size:13px;margin-top:12px;color:var(--muted)}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.card{padding:28px;border:1px solid var(--line);border-radius:18px;background:white;text-decoration:none;display:block}.card p{color:var(--muted);font-size:14px}.card .link{font-size:13px;font-weight:650;color:var(--purple)}.section-heading{margin:50px 0 22px}.callout{padding:24px 28px;border-radius:16px;background:var(--pale);margin-top:32px}.callout p{margin:8px 0;color:var(--muted);font-size:14px}.pill{display:inline-block;color:var(--purple);background:var(--pale);padding:5px 11px;border-radius:30px;font-size:12px;font-weight:600}.article{max-width:750px;margin:auto}.article p{color:#58677f}.article h2{margin-top:38px}.article .equation{font-size:26px;background:white;border:1px solid var(--line);padding:25px;border-radius:15px;text-align:center;font-family:ui-serif,Georgia,serif;font-style:italic}.fraction{display:inline-flex;flex-direction:column;text-align:center;vertical-align:middle;line-height:1.2;margin:0 8px}.fraction span:first-child{border-bottom:1px solid;padding-bottom:4px}.fraction span:last-child{padding-top:4px}.site-footer{max-width:1180px;margin:auto;padding:35px 36px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}.site-footer .brand{font-size:22px}.site-footer div{display:flex;gap:25px}.site-footer a{text-decoration:none}.account-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:30px}.notice{font-size:13px;color:var(--muted);margin-top:25px}@media(max-width:760px){.site-header{padding:20px;flex-wrap:wrap;gap:14px}.site-header nav{gap:18px;flex-wrap:wrap}.site-main{padding:32px 20px 60px}.site-hero,.cards,.account-grid{grid-template-columns:1fr}.site-hero{gap:30px}.hero-preview{transform:none}h1{letter-spacing:-1px}.site-footer{padding:28px 20px}}
.subject-picker{scroll-margin-top:24px;margin:0 0 56px}.subject-picker h2{font-size:34px;margin:12px 0}.picker-intro{color:var(--muted);max-width:670px;margin-bottom:26px}.subject-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.subject-option{font:inherit;text-align:left;background:#fff;color:var(--ink);border:1px solid var(--line);border-radius:20px;padding:24px 20px;cursor:pointer;display:flex;flex-direction:column;align-items:flex-start;transition:border-color .15s,box-shadow .15s,transform .15s}.subject-option:hover{border-color:#bfb3f5;transform:translateY(-3px)}.subject-option.selected,.course-option.selected{border-color:var(--purple);background:#f6f3ff;box-shadow:0 0 0 1px var(--purple)}.subject-symbol{display:grid;place-items:center;width:46px;height:46px;background:var(--pale);color:var(--purple);border-radius:13px;font-size:27px;line-height:1;margin-bottom:20px}.subject-option strong{font-size:20px}.subject-description{font-size:13px;color:var(--muted);margin:6px 0 20px;min-height:43px}.subject-status{font-size:11px;font-weight:650;color:var(--muted);background:#f2f3f8;border-radius:20px;padding:5px 9px}.subject-status.available,.ready .subject-status{background:#e5f5e9;color:#34674e}.course-panel{margin-top:22px;padding:28px;border:1px solid var(--line);border-radius:20px;background:white}.picker-step{display:flex;align-items:center;gap:12px;margin:0 0 16px}.picker-step h3{font-size:17px;margin:0}.picker-step h3 span{color:var(--muted);font-weight:400}.step-number{background:var(--pale);color:var(--purple);border-radius:50%;width:28px;height:28px;display:grid;place-items:center;font-size:12px;font-weight:700}.picker-options{display:flex;gap:14px;margin-bottom:26px}.course-option{font:inherit;flex:1;cursor:pointer;text-align:left;border:1px solid var(--line);background:white;border-radius:13px;padding:16px 20px;color:var(--ink)}.course-option strong{font-size:18px;display:block}.course-option span{color:var(--muted);font-size:13px}.course-result{display:flex;align-items:center;justify-content:space-between;gap:24px;background:#f7f7fc;border-radius:14px;padding:24px}.course-result.ready{background:#f0faf3}.course-result h3{margin:10px 0 4px}.course-result p{font-size:14px;color:var(--muted);margin:0;max-width:520px}.course-result .button{white-space:nowrap}@media(max-width:900px){.subject-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:560px){.subject-option{padding:18px 14px}.subject-option strong{font-size:18px}.subject-status{font-size:10px}.subject-description{min-height:64px}.course-panel{padding:20px}.picker-options,.course-result{flex-direction:column;align-items:stretch}.course-option{width:100%}.subject-picker h2{font-size:28px}}
.landing-hero{display:grid;grid-template-columns:1.15fr 1fr;gap:70px;align-items:center;padding:12px 0 68px}.landing-hero h1{font-size:clamp(40px,5.2vw,64px);letter-spacing:-2.4px;line-height:1.08}.landing-hero h1 span{color:var(--purple)}.landing-hero .lead{font-size:17px;line-height:1.8;max-width:500px}.landing-hero .button-row{align-items:center;gap:22px}.text-link{font-size:13px;font-weight:650;color:var(--purple);text-decoration:none}.hero-note{font-size:12px;color:var(--muted);line-height:1.8}.live-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:#4d9970;margin-right:7px}.exam-preview{background:white;border:1px solid var(--line);padding:26px;border-radius:22px;box-shadow:0 20px 70px #55429a0c}.preview-top{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:12px;color:var(--muted)}.preview-top .pill{font-size:10px}.preview-question{font-size:17px;line-height:1.65;margin:27px 0}.preview-question strong{margin-right:8px}.preview-question>span{color:var(--purple);float:right;font-weight:700}.preview-working{background:#f8f8fd;padding:20px;border-radius:12px;margin-bottom:16px}.preview-working p{font-size:13px;color:var(--muted)}.math-line{font-size:25px;letter-spacing:-.6px;font-weight:500}.exam-preview .notice{font-size:11px;margin:14px 0 0}.subject-picker{padding:30px 0 46px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:60px}.exam-intro{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:end}.exam-intro h2{font-size:32px;margin:12px 0 0}.exam-intro>p{font-size:15px;color:var(--muted);margin:0}.exam-features{display:grid;grid-template-columns:repeat(3,1fr);gap:38px;margin:36px 0 70px}.feature-number{font-size:12px;color:var(--purple);font-weight:700}.exam-features h3{font-size:18px;margin:10px 0}.exam-features p{font-size:14px;color:var(--muted);margin:0}.feedback-section{scroll-margin-top:28px;display:grid;grid-template-columns:1fr 1.1fr;gap:65px;align-items:center;background:#f2effb;border-radius:26px;padding:42px;margin-bottom:60px}.feedback-copy h2{font-size:34px;line-height:1.2;margin:16px 0}.feedback-copy>p{font-size:14px;color:#69748b}.feedback-copy .notice{font-size:11px}.feedback-demo{background:white;border:1px solid #e5e0f4;border-radius:18px;padding:24px}.demo-heading{display:flex;justify-content:space-between;gap:12px;font-size:13px}.demo-heading>span{font-size:11px;color:var(--muted)}.student-attempt{background:#f8f8fd;border-radius:10px;padding:16px;margin:18px 0}.student-attempt p{font-size:17px;margin:8px 0 0}.estimated-score{display:flex;align-items:center;gap:12px;margin:18px 0}.estimated-score strong{font-size:28px;letter-spacing:-1px}.estimated-score span{font-size:11px;color:var(--muted)}.demo-mark{display:flex;gap:12px;border-top:1px solid var(--line);padding:16px 0}.demo-mark strong{font-size:13px}.demo-mark p{font-size:12px;color:var(--muted);margin:5px 0 0}.mark-icon{flex-shrink:0;width:25px;height:25px;display:grid;place-items:center;border-radius:50%;font-size:13px}.mark-icon.earned{color:#32694e;background:#e5f5e9}.mark-icon.missed{color:#a66636;background:#fff1e6}.correct-answer{background:#e5f5e9;color:#32694e;padding:14px;border-radius:9px;font-size:13px}.demo-solution{font-size:12px;margin-top:15px;color:#65728b}.demo-solution summary{color:var(--purple);font-weight:650;cursor:pointer}.visitor-links{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin-bottom:65px}.visitor-links>a{display:block;text-decoration:none;padding:24px 0;border-top:1px solid var(--line)}.visitor-links h3{margin:10px 0;font-size:22px}.visitor-links p{font-size:14px;color:var(--muted);max-width:380px}.landing-faq{max-width:780px}.landing-faq h2{font-size:32px;margin:12px 0 24px}.landing-faq details{border-bottom:1px solid var(--line);padding:19px 0}.landing-faq summary{font-size:15px;font-weight:600;cursor:pointer}.landing-faq p{font-size:14px;color:var(--muted);padding-right:20px}.button:hover{background:#5945d8}.text-link:hover{text-decoration:underline}@media(max-width:900px){.landing-hero{gap:30px}.feedback-section{gap:28px;padding:28px}.demo-heading{flex-wrap:wrap}}@media(max-width:760px){.landing-hero,.exam-intro,.feedback-section,.visitor-links{grid-template-columns:1fr}.landing-hero{padding:0 0 42px}.landing-hero h1{letter-spacing:-1.6px}.exam-preview{max-width:540px}.exam-intro{gap:20px}.exam-features{grid-template-columns:1fr;gap:25px;margin-bottom:45px}.feedback-section{padding:24px 18px}.feedback-demo{padding:18px}.subject-picker{margin-bottom:40px}.visitor-links{gap:10px;margin-bottom:40px}.exam-intro h2,.feedback-copy h2{font-size:29px}}
.student-login{max-width:460px;padding:28px;background:white;border:1px solid var(--line);border-radius:18px;margin:28px 0}.student-login label{display:block;font-size:14px;font-weight:650;margin-bottom:8px}.student-login input{font:inherit;width:100%;padding:12px;border:1px solid var(--line);border-radius:9px;margin-bottom:20px;color:var(--ink)}.student-login button{width:100%;margin:6px 0;cursor:pointer}.student-login button:disabled{opacity:.55;cursor:not-allowed}.student-login input:focus-visible{outline:3px solid #ac9aff;outline-offset:2px}.student-login [role=status]{font-size:14px}