/* Public workbook layout; colors come from shared/palette.css. */
* {
  box-sizing:border-box;
}

body.public-entry {
  margin:0;
  background:var(--bg);
  color:var(--entry-ink);
  font-family:'Hanken Grotesk',Arial,sans-serif;
  font-size:17px;
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
a {
  color:inherit;
  text-underline-offset:5px;
}
button,input {
  font:inherit;
}
button,a,input,summary {
  -webkit-tap-highlight-color:transparent;
}
button {
  cursor:pointer;
}
button:disabled {
  cursor:wait;
  opacity:.65;
}
[hidden] {
  display:none!important;
}
h1,h2,h3,p {
  margin:0;
}
h1,h2,h3 {
  line-height:1.06;
  letter-spacing:-.045em;
}
h1,h2 {
  font-weight:700;
}
p {
  max-width:65ch;
}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible {
  outline:3px solid var(--entry-blue);
  outline-offset:5px;
}
input:focus-visible {
  outline-offset:2px;
}
.wrap {
  width:calc(100% - 48px);
  max-width:none;
  margin-inline:auto;
}
.skip-link {
  position:fixed;
  left:16px;
  top:-80px;
  background:var(--card);
  color:var(--entry-ink);
  padding:12px 20px;
  z-index:100;
}
.skip-link:focus {
  top:12px;
}
.site-header {
  height:104px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  border-bottom:1px solid var(--entry-rule);
  gap:24px;
}
.brand {
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:28px;
  font-weight:800;
  letter-spacing:-1.2px;
  text-decoration:none;
}
.brand svg {
  width:39px;
  height:39px;
  color:var(--entry-blue);
}
.site-header nav {
  display:flex;
  align-items:center;
  gap:34px;
}
.site-header nav>a:not(.button),.quiet-link {
  font-size:15px;
  font-weight:600;
  text-decoration:none;
  min-height:44px;
  display:inline-flex;
  align-items:center;
}
.site-header nav>a:hover,.quiet-link:hover {
  text-decoration:underline;
}
.button {
  min-height:54px;
  padding:14px 24px;
  border:1px solid transparent;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:12px;
  text-decoration:none;
  font-weight:700;
  font-size:16px;
  border-radius:2px;
  line-height:1.35;
}
.primary {
  color:var(--on-action);
  background:var(--action);
}
.primary:hover {
  background:var(--feature-bg);
}
.secondary {
  color:var(--entry-ink);
  background:var(--card);
  border-color:var(--entry-rule);
}
.secondary:hover {
  background:var(--entry-wash);
}
.compact {
  min-height:44px;
  padding:10px 25px;
}
.text-link {
  display:inline-flex;
  align-items:center;
  min-height:44px;
  font-weight:700;
  font-size:16px;
}
.text-link:hover {
  color:var(--entry-blue);
}
.hero {
  display:grid;
  grid-template-columns:1.05fr 1fr;
  align-items:center;
  gap:64px;
  padding-top:64px;
  padding-bottom:72px;
}
.hero h1 {
  font-size:clamp(60px,6.6vw,96px);
  line-height:.99;
  letter-spacing:-.062em;
  margin-bottom:30px;
}
.hero-copy>p:not(.hero-note) {
  font-size:22px;
  line-height:1.5;
  color:var(--entry-muted);
}
.hero-actions {
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:24px;
  margin-top:32px;
}
.hero-note {
  font-size:14px;
  color:var(--entry-muted);
  margin-top:22px;
}
.workbook {
  background:var(--feature-bg);
  padding:23px 30px 0;
  color:white;
  align-self:stretch;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
}
.workbook-top {
  display:flex;
  justify-content:space-between;
  gap:20px;
  font-size:13px;
  font-weight:600;
  padding-bottom:22px;
}
.workbook-top span:last-child {
  color:var(--feature-muted);
}
.worksheet {
  background:var(--card);
  color:var(--entry-ink);
  padding:28px 32px 26px;
}
.worksheet-heading {
  display:flex;
  align-items:center;
  justify-content:space-between;
  font-size:13px;
  font-weight:600;
  color:var(--entry-muted);
  margin-bottom:12px;
}
.worksheet-heading>span {
  font-size:48px;
  line-height:1;
  color:var(--entry-blue);
  font-weight:500;
}
.worksheet h2 {
  font-size:38px;
  line-height:1.05;
  margin-bottom:16px;
}
.worksheet-question {
  font-size:16px;
  color:var(--entry-muted);
}
.fraction-demo {
  margin-top:27px;
}
.diagram-label {
  display:flex;
  justify-content:space-between;
  font-size:13px;
  font-weight:600;
  margin:14px 0 8px;
}
.fraction-strip {
  display:grid;
  height:43px;
  border:1px solid var(--entry-blue);
  gap:2px;
  background:var(--card);
  padding:2px;
}
.fraction-strip i {
  background:var(--entry-wash);
}
.fraction-strip.two {
  grid-template-columns:repeat(2,1fr);
}
.fraction-strip.four {
  grid-template-columns:repeat(4,1fr);
}
.fraction-strip.eight {
  grid-template-columns:repeat(8,1fr);
}
.fraction-strip.two i:first-child,.fraction-strip.four i:nth-child(-n+2),.fraction-strip.eight i:nth-child(-n+4) {
  background:var(--action);
}
.demo-controls {
  display:flex;
  gap:8px;
  margin-top:20px;
}
.demo-controls button {
  background:var(--card);
  border:1px solid var(--entry-rule);
  padding:9px 16px;
  min-height:44px;
  font-size:14px;
  font-weight:600;
  color:var(--entry-ink);
  border-radius:2px;
}
.demo-controls button[aria-pressed=true] {
  background:var(--entry-wash);
  border-color:var(--entry-blue);
  color:var(--entry-blue);
}
.demo-controls button:hover {
  border-color:var(--entry-blue);
}
.demo-caption {
  font-size:13px;
  color:var(--entry-muted);
  margin-top:13px;
  min-height:39px;
  max-width:35ch;
}
.workbook-bottom {
  display:flex;
  align-items:center;
  gap:14px;
  min-height:71px;
  font-size:15px;
}
.small-star {
  color:var(--entry-yellow);
  font-size:35px;
  line-height:1;
}
.learning-loop {
  background:var(--entry-wash);
  padding:70px 0 60px;
  scroll-margin-top:24px;
}
.loop-layout {
  display:grid;
  grid-template-columns:1fr 1.1fr;
  gap:100px;
}
.loop-layout h2,.parent-copy h2 {
  font-size:45px;
  line-height:1.08;
}
.loop-layout>div>p {
  margin-top:22px;
  color:var(--entry-muted);
  font-size:18px;
}
.loop-steps {
  list-style:none;
  padding:0;
  margin:0;
}
.loop-steps li {
  display:flex;
  gap:26px;
  padding:22px 0;
  border-bottom:1px solid var(--border);
}
.loop-steps li:first-child {
  padding-top:0;
}
.loop-steps li:last-child {
  border:0;
  padding-bottom:0;
}
.step-number {
  color:var(--entry-blue);
  font-size:15px;
  font-weight:700;
  line-height:1.4;
  padding-top:3px;
}
.loop-steps h3 {
  font-size:21px;
  letter-spacing:-.025em;
  line-height:1.25;
  margin-bottom:6px;
}
.loop-steps p {
  font-size:16px;
  color:var(--entry-muted);
  max-width:43ch;
}
.parents-section {
  padding-block:84px;
  display:grid;
  grid-template-columns:1fr 1.1fr;
  gap:100px;
  scroll-margin-top:24px;
}
.parent-copy>p {
  font-size:18px;
  line-height:1.65;
  color:var(--entry-muted);
  margin:25px 0 20px;
  max-width:44ch;
}
.questions>h3 {
  font-size:19px;
  letter-spacing:-.02em;
  margin-bottom:18px;
}
.questions details {
  border-top:1px solid var(--entry-rule);
}
summary {
  list-style:none;
  cursor:pointer;
  min-height:54px;
  padding:18px 32px 18px 0;
  font-size:16px;
  font-weight:600;
  position:relative;
}
summary::-webkit-details-marker {
  display:none;
}
summary:after {
  content:'+';
  position:absolute;
  right:4px;
  font-size:22px;
  line-height:24px;
  font-weight:400;
}
details[open]>summary:after {
  content:'−';
}
details>p {
  color:var(--entry-muted);
  font-size:16px;
  line-height:1.65;
  padding-bottom:18px;
}
.access-section {
  background:var(--feature-bg);
  color:var(--on-action);
  padding-block:48px;
}
.access-layout {
  display:grid;
  grid-template-columns:1fr 1.1fr;
  gap:100px;
  align-items:center;
}
.access-layout h2 {
  font-size:34px;
  letter-spacing:-.035em;
  line-height:1.2;
}
.access-layout>div>p {
  font-size:15px;
  color:var(--feature-muted);
  margin-top:14px;
}
.access-layout .field-help {
  color:var(--feature-muted);
}
.access-layout :focus-visible {
  outline-color:var(--entry-yellow);
}
.site-footer {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  min-height:108px;
  font-size:13px;
  color:var(--entry-muted);
}
.site-footer nav {
  display:flex;
  gap:26px;
  flex-wrap:wrap;
}
.site-footer a {
  min-height:44px;
  display:inline-flex;
  align-items:center;
  text-decoration:none;
}
.site-footer a:hover {
  text-decoration:underline;
}
.footer-name {
  font-size:17px;
  font-weight:700;
  color:var(--entry-ink);
}
.login-page {
  min-height:100svh;
  display:flex;
  flex-direction:column;
}
.login-layout {
  display:grid;
  grid-template-columns:minmax(0, .7fr) minmax(0, 1.3fr);
  gap:32px;
  align-items:start;
  padding-block:32px;
  flex:1;
}
.login-story {
  background:var(--feature-bg);
  color:var(--on-action);
  padding:28px;
  align-self:start;
  display:flex;
  flex-direction:column;
  justify-content:flex-start;
  min-height:0;
}
.story-note {
  font-size:13px;
  color:var(--feature-muted);
  font-weight:500;
  margin-bottom:30px;
}
.login-story h2 {
  font-size:36px;
  line-height:1.04;
  margin-bottom:20px;
  letter-spacing:-.048em;
}
.login-story>p:not(.story-note) {
  font-size:17px;
  line-height:1.6;
  color:var(--feature-muted);
}
.login-fraction {
  margin:36px 0 30px;
}
.fraction-title {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  margin-bottom:14px;
}
.fraction-title>span:first-child {
  max-width:22ch;
  font-size:14px;
}
.fraction-title>span:last-child {
  font-size:48px;
  line-height:1;
  color:var(--entry-yellow);
}
.login-fraction .fraction-strip {
  height:40px;
  border-color:#d5e9ec;
  background:var(--action);
  margin-top:8px;
  gap:3px;
  padding:2px;
}
.login-fraction .fraction-strip i {
  background:#006b78;
}
.login-fraction .fraction-strip.two i:first-child,.login-fraction .fraction-strip.four i:nth-child(-n+2),.login-fraction .fraction-strip.eight i:nth-child(-n+4) {
  background:var(--entry-yellow);
}
.fraction-caption {
  font-size:13px;
  margin-top:14px;
  color:var(--feature-muted);
}
.story-link {
  display:flex;
  justify-content:space-between;
  align-items:center;
  min-height:44px;
  font-size:14px;
  border-top:1px solid var(--feature-border);
  padding-top:20px;
}
.login-story :focus-visible {
  outline-color:var(--entry-yellow);
}
.login-panel {
  width:100%;
  max-width:560px;
  justify-self:start;
  padding-block:0;
}
.login-intro h1 {
  font-size:32px;
  line-height:1.1;
  letter-spacing:-.045em;
}
.login-intro>p {
  margin-top:12px;
  color:var(--entry-muted);
  font-size:17px;
}
.login-intro {
  margin-bottom:20px;
}
.form-group {
  margin-bottom:16px;
}
.form-group label {
  display:block;
  font-size:15px;
  font-weight:600;
  margin-bottom:8px;
}
.form-group input {
  width:100%;
  min-height:54px;
  border:1px solid var(--field-border);
  border-radius:2px;
  background:var(--card);
  color:var(--entry-ink);
  font-size:17px;
  padding:13px 15px;
}
.form-group input::placeholder {
  color:var(--muted);
  opacity:1;
}
.field-help {
  font-size:13px;
  color:var(--entry-muted);
  line-height:1.5;
  margin-top:8px;
}
.login-submit {
  width:100%;
}
.form-error:not(:empty) {
  color:var(--danger);
  font-size:15px;
  line-height:1.5;
  background:var(--danger-bg);
  padding:12px 14px;
  margin-top:14px;
}
.clerk-divider {
  text-align:center;
  color:var(--entry-muted);
  font-size:13px;
  margin:22px 0 12px;
}
.login-help {
  border-bottom:1px solid var(--entry-rule);
  margin-top:18px;
}
.login-help summary {
  font-size:14px;
}
.login-help>p {
  font-size:14px;
}
.parent-note {
  font-size:13px;
  line-height:1.65;
  color:var(--entry-muted);
  margin-top:20px;
  max-width:45ch;
}
.login-page .site-footer {
  min-height:78px;
  border-top:1px solid var(--entry-rule);
}
@media(min-width:1500px) {
  .hero {
    padding-block:76px;
  }
  .hero h1 {
    font-size:100px;
  }
  .login-layout {
    padding-block:32px;
  }
}
@media(max-width:1100px) {
  .wrap {
    width:calc(100% - 48px);
  }
  .hero {
    gap:36px;
  }
  .hero h1 {
    font-size:72px;
  }
  .workbook {
    padding:20px 22px 0;
  }
  .worksheet {
    padding:24px;
  }
  .worksheet h2 {
    font-size:33px;
  }
  .loop-layout,.parents-section,.access-layout {
    gap:55px;
  }
  .login-layout {
    gap:24px;
  }
  .login-story {
    padding:24px;
  }
  .login-story h2 {
    font-size:32px;
  }
  .login-intro h1 {
    font-size:32px;
  }
  .login-fraction {
    margin-block:30px;
  }
}
@media(max-width:800px) {
  .wrap {
    width:calc(100% - 40px);
  }
  .site-header {
    height:82px;
  }
  .brand {
    font-size:25px;
  }
  .brand svg {
    width:34px;
    height:34px;
  }
  .site-header nav {
    gap:20px;
  }
  .hero {
    gap:24px;
    padding-block:44px;
  }
  .hero h1 {
    font-size:56px;
  }
  .hero-copy>p:not(.hero-note) {
    font-size:18px;
  }
  .hero-actions {
    gap:12px;
    margin-top:24px;
  }
  .hero-note {
    font-size:12px;
  }
  .workbook {
    padding:18px 18px 0;
  }
  .workbook-top {
    font-size:11px;
    padding-bottom:16px;
    gap:8px;
  }
  .worksheet {
    padding:20px;
  }
  .worksheet h2 {
    font-size:29px;
  }
  .worksheet-question {
    font-size:14px;
  }
  .worksheet-heading>span {
    font-size:38px;
  }
  .demo-controls button {
    padding:9px 12px;
  }
  .learning-loop {
    padding-block:48px;
  }
  .loop-layout,.parents-section,.access-layout {
    gap:35px;
  }
  .loop-layout h2,.parent-copy h2 {
    font-size:35px;
  }
  .parents-section {
    padding-block:55px;
  }
  .loop-steps li {
    gap:16px;
  }
  .loop-steps h3 {
    font-size:19px;
  }
  .login-layout {
    gap:24px;
  }
  .login-story {
    padding:24px;
    min-height:0;
  }
  .login-story h2 {
    font-size:30px;
  }
  .login-panel {
    max-width:none;
  }
  .login-intro h1 {
    font-size:32px;
  }
  .login-story>p:not(.story-note) {
    font-size:16px;
  }
  .story-note {
    margin-bottom:24px;
    font-size:12px;
  }
  .desktop-break {
    display:none;
  }
}
@media(max-width:640px) {
  .landing-page .site-header .nav-about {
    display:none;
  }
  .site-header {
    height:76px;
  }
  .site-header nav {
    gap:12px;
  }
  .hero {
    grid-template-columns:1fr;
    gap:36px;
    padding-block:36px 40px;
  }
  .hero h1 {
    font-size:clamp(48px,12vw,72px);
    line-height:1;
    letter-spacing:-.055em;
    margin-bottom:22px;
  }
  .hero-copy>p:not(.hero-note) {
    font-size:19px;
  }
  .hero-actions {
    margin-top:25px;
    gap:20px;
  }
  .hero-actions .button {
    padding-inline:20px;
  }
  .hero-note {
    font-size:13px;
    margin-top:16px;
  }
  .workbook {
    padding:20px 22px 0;
  }
  .workbook-top {
    font-size:12px;
    padding-bottom:18px;
  }
  .worksheet {
    padding:24px;
  }
  .worksheet h2 {
    font-size:34px;
  }
  .worksheet-question {
    font-size:16px;
  }
  .worksheet-heading {
    margin-bottom:18px;
  }
  .worksheet-heading>span {
    font-size:46px;
  }
  .workbook-bottom {
    min-height:64px;
  }
  .demo-caption {
    min-height:0;
  }
  .loop-layout,.parents-section,.access-layout {
    grid-template-columns:1fr;
    gap:32px;
  }
  .loop-layout h2,.parent-copy h2 {
    font-size:37px;
  }
  .loop-layout>div>p {
    font-size:17px;
    margin-top:16px;
  }
  .loop-steps li {
    padding:20px 0;
    gap:22px;
  }
  .loop-steps h3 {
    font-size:20px;
  }
  .loop-steps p {
    font-size:16px;
  }
  .parents-section {
    padding-block:48px;
  }
  .parent-copy>p {
    font-size:17px;
    margin-top:20px;
  }
  .questions>h3 {
    margin-bottom:14px;
  }
  .access-section {
    padding-block:36px;
  }
  .access-layout h2 {
    font-size:32px;
  }
  .access-layout {
    gap:26px;
  }
  .site-footer {
    align-items:flex-start;
    flex-direction:column;
    gap:0;
    padding-block:20px;
    min-height:100px;
  }
  .site-footer nav {
    gap:20px;
  }
  .site-footer a {
    font-size:12px;
  }
  .site-footer .footer-name {
    font-size:17px;
  }
  .login-layout {
    display:flex;
    flex-direction:column;
    align-items:stretch;
    padding-top:24px;
    padding-bottom:30px;
    gap:28px;
  }
  .login-panel {
    order:0;
    padding:0;
  }
  .login-story {
    order:1;
    min-height:0;
    padding:24px;
    display:block;
  }
  .login-intro {
    margin-bottom:20px;
  }
  .login-intro h1 {
    font-size:32px;
  }
  .login-intro>p {
    font-size:16px;
  }
  .login-story .story-note,.login-story .login-fraction {
    display:none;
  }
  .login-story h2 {
    font-size:29px;
    line-height:1.15;
    margin-bottom:12px;
  }
  .login-story h2 br {
    display:none;
  }
  .login-story>p:not(.story-note) {
    font-size:15px;
    max-width:34ch;
  }
  .login-story .story-link {
    margin-top:18px;
    padding-top:14px;
  }
  .parent-note {
    margin-top:18px;
  }
  .login-page .site-footer {
    min-height:100px;
  }
  .quiet-link {
    font-size:14px;
  }
  .form-group {
    margin-bottom:20px;
  }
  .login-help {
    margin-top:12px;
  }
}
@media(max-width:360px) {
  .hero-actions {
    gap:10px;
  }
  .hero-actions .button {
    font-size:15px;
    padding-inline:14px;
  }
  .text-link {
    font-size:14px;
  }
  .workbook {
    padding-inline:16px;
  }
  .worksheet {
    padding:20px;
  }
  .worksheet h2 {
    font-size:31px;
  }
  .site-footer nav {
    gap:12px;
  }
  .login-intro h1 {
    font-size:32px;
  }
}
@media(prefers-reduced-motion:reduce) {
  *,*::before,*::after {
    scroll-behavior:auto!important;
  }
}
.join-family>.button {
  background:var(--entry-yellow);
  color:var(--on-highlight);
  margin-top:12px;
}
.join-family>.button:hover {
  background:var(--highlight-hover);
}
.join-family>p:first-child {
  font-size:15px;
}

/* Explain the platform on login rather than using an unrelated lesson graphic. */
.login-overview { margin:32px 0 24px; }
.login-overview>div { padding:16px 0; border-top:1px solid var(--feature-border); }
.login-overview dt { color:var(--highlight); font-size:17px; font-weight:700; }
.login-overview dd { margin:5px 0 0; color:var(--feature-muted); font-size:15px; line-height:1.5; }
.affiliation-note { margin-top:18px; padding-top:18px; border-top:1px solid var(--entry-rule); color:var(--entry-muted); font-size:13px; line-height:1.6; }
.hero-note { max-width:46ch; }
.login-story .story-link { margin-top:24px; }
@media(max-width:640px) { .login-overview { margin:20px 0 0; } .login-overview>div { padding:12px 0; } }