.site-header{display:flex;align-items:center;justify-content:space-between;gap:25px;min-height:92px;border-bottom:1px solid var(--line);position:relative;z-index:10}.site-brand{display:flex;gap:11px;align-items:center;text-decoration:none;color:var(--ink);font-size:22px;font-weight:720;letter-spacing:-.045em}.site-brand svg{flex:none}.site-nav{display:flex;align-items:center;gap:24px;font-size:13px;font-weight:550}.site-nav>a,.chapter-dropdown>summary{color:var(--ink);text-decoration:none}.site-nav>a{padding:12px 0}.site-nav>a:hover,.site-nav>a[aria-current=page]{color:var(--purple-dark)}.site-nav>a[aria-current=page]{box-shadow:inset 0 -2px var(--purple)}.chapter-dropdown{position:relative;margin:0;border:0;background:transparent;border-radius:0}.chapter-dropdown>summary{list-style:none;padding:12px 0;font-size:13px;display:flex;align-items:center;gap:8px}.chapter-dropdown>summary::-webkit-details-marker{display:none}.chapter-dropdown-links{position:absolute;right:0;top:49px;width:270px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 12px 32px #29213b14;padding:9px;display:grid;gap:3px}.chapter-dropdown-links a{padding:11px 12px;border-radius:8px;text-decoration:none;font-size:13px;color:var(--ink)}.chapter-dropdown-links a span{color:var(--purple);font-size:10px;margin-right:10px}.chapter-dropdown-links a:hover,.chapter-dropdown-links a[aria-current=page]{background:var(--lavender);color:var(--purple-dark)}.menu-toggle{display:none;border:1px solid var(--line);border-radius:24px;background:transparent;padding:10px 14px;font-size:13px;gap:10px;align-items:center;min-height:44px}.site-main{min-height:50vh}.site-footer{display:flex;align-items:flex-start;justify-content:space-between;gap:30px;border-top:1px solid var(--line);padding:26px 0 31px;margin-top:45px;color:var(--muted);font-size:11px}.site-footer>div{max-width:650px}.site-footer p+p{margin-top:8px}.site-footer .evidence-date{font-size:10px}.site-footer nav{display:flex;flex-wrap:wrap;gap:8px 17px;justify-content:flex-end;flex:none}.site-footer nav a{font-size:11px}.page-heading{margin:42px 0 27px}.page-heading h1,.watch-heading h1{font-size:clamp(36px,4.4vw,52px)}.page-heading p{margin-top:18px;max-width:750px;font-size:16px;color:var(--muted);line-height:1.75}.lesson{animation:none}.lesson-heading h1{font-size:clamp(28px,3vw,39px)}.chapter-page-tabs{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));border-bottom:1px solid var(--line);margin-top:15px}.chapter-page-tabs a{position:relative;display:flex;gap:8px;align-items:center;justify-content:center;color:var(--muted);font-size:11px;font-weight:550;text-decoration:none;padding:17px 5px;min-height:65px}.chapter-page-tabs a>span:first-child{display:grid;place-items:center;border:1px solid #d7d3dd;border-radius:50%;width:25px;height:25px;flex:none;font-size:10px}.chapter-page-tabs a:hover{background:#efede7}.chapter-page-tabs a[aria-current=page]{color:var(--purple-dark);box-shadow:inset 0 -3px var(--purple)}.chapter-page-tabs a[aria-current=page]>span:first-child{color:white;background:var(--purple);border-color:var(--purple)}.chapter-pagination{margin:35px 0 15px;display:grid;grid-template-columns:1fr 1fr;gap:20px;border-top:1px solid var(--line);padding-top:23px}.chapter-pagination a{text-decoration:none;padding:17px 20px;border:1px solid var(--line);border-radius:14px;display:flex;flex-direction:column;gap:6px;color:var(--ink)}.chapter-pagination a:last-child{text-align:right}.chapter-pagination a:hover{background:var(--lavender);border-color:#cfc4e5}.chapter-pagination span{font-size:11px;color:var(--muted)}.chapter-pagination strong{font-size:15px}.text-next{text-decoration:none}.primary,.secondary{text-decoration:none}.home-hero{grid-template-columns:1.15fr 1fr;gap:25px;padding:43px 0 36px}.home-hero h1{font-size:clamp(42px,5.4vw,67px)}.home-tagline{font-size:15px;color:var(--muted);margin-top:23px;max-width:360px}.home-start{margin-top:23px}.home-brain{border-radius:28px;background:#efebf6;padding:14px 4px}.home-brain svg{display:block;width:100%;height:auto}.home-brain svg [role=button]{cursor:default}.welcome{padding:26px 31px;background:#fff;max-width:100%;margin:0 0 33px;font-size:16px;line-height:1.75}.welcome p:first-child{max-width:1020px}.welcome p+p{color:var(--purple-dark);font-weight:550;margin-top:13px}.section-intro h2{font-size:30px}.chapter-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.chapter-card{position:relative;text-decoration:none;display:flex;flex-direction:column;padding:25px 26px;color:var(--ink);transition:transform .16s,border-color .16s}.chapter-card:hover{border-color:#b3a3d9;transform:translateY(-3px)}.chapter-card-number{font-size:34px;line-height:1.1;font-weight:600;letter-spacing:-.04em;color:#a096bd;margin-bottom:24px}.chapter-card .section-code{font-size:9px;letter-spacing:.09em;margin-bottom:10px}.chapter-card h3{font-size:25px;line-height:1.2;margin-bottom:13px}.chapter-card p{font-size:13px;color:var(--muted);line-height:1.75;margin-bottom:24px}.card-bottom{margin-top:auto;padding-top:16px;border-top:1px solid var(--line);color:var(--purple-dark);font-size:11px;font-weight:650;display:flex;justify-content:space-between}.chapter-card-1,.chapter-card-5{background:#f1edf8}.chapter-card-3,.chapter-card-6{background:#edf4ee}.chapter-card-4{background:#faeee8}.home-watch{background:#2f2b3f;border-radius:22px;padding:29px 32px;display:flex;align-items:center;justify-content:space-between;gap:25px;color:#fff;margin-top:29px}.home-watch .section-code{color:#c6b8e9}.home-watch h2{font-size:29px}.home-watch p{color:#ddd5e8;font-size:14px;margin-top:12px;max-width:650px}.home-watch .secondary{flex:none;background:transparent;color:#fff;border-color:#776886}.prose-page{max-width:850px;margin:0 auto 50px;font-size:16px;line-height:1.8}.prose-page h2{font-size:28px;margin:31px 0 15px}.prose-page p{color:#595663}.prose-page li{color:#595663}.prose-page li+li{margin-top:9px}.privacy-list{padding-left:22px}.privacy-list li+li{margin-top:24px}.license-text{white-space:pre-wrap;overflow-wrap:anywhere;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:13px;line-height:1.8;padding:27px;background:#fff;border:1px solid var(--line);border-radius:18px;margin:26px 0}.sources-page{max-width:1000px;margin:auto}.sources-page .sources li{grid-template-columns:38px 1fr;padding:23px 12px;scroll-margin-top:20px}.sources-page .sources li:before{font-size:12px}.sources-page .sources a{font-size:17px}.sources-page .sources p{font-size:14px;line-height:1.75}.sources .source-publisher{color:var(--purple-dark);font-weight:550}.sources a{overflow-wrap:anywhere}.watch-related{padding:25px 29px;margin-top:23px}.watch-related h3{font-size:25px}.watch-related>p{font-size:14px;color:var(--muted);margin-top:11px}.watch-related>a{display:inline-block;margin-top:18px;font-size:13px}.related-moments{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}.related-moments a{text-decoration:none;padding:15px 17px;background:var(--lavender);border-radius:11px;font-size:13px;line-height:1.6}.related-moments strong{display:block;font-size:16px}.quit-resource-list{padding-left:19px;margin:18px 0 0;font-size:14px;color:#4f6657;line-height:1.8}.quit-resource-list li+li{margin-top:12px}.hope .quit-resource-list a,.hope .kids-help-note a{display:inline;font-size:inherit;margin-top:0}.kids-help-note{border-top:1px solid #cddfd2;padding-top:18px}.hope h2{font-size:27px;color:#315745}.site-main>.lesson{padding-top:1px}.source-dialog .model-note a{font-size:inherit}.site-main:focus{outline:none}.site-footer [aria-current=page]{font-weight:700}
@media(max-width:980px){.site-nav{gap:18px}.site-brand{font-size:20px}.chapter-page-tabs a{font-size:10px;gap:5px}.chapter-cards{gap:14px}.chapter-card{padding:23px}.home-hero{gap:20px}.home-hero h1{font-size:52px}.home-brain{padding:16px 0}.site-footer{display:block}.site-footer nav{justify-content:flex-start;margin-top:17px}}
@media(max-width:760px){.site-header{min-height:77px;gap:12px;flex-wrap:wrap;padding:17px 0}.site-brand{font-size:22px}.menu-toggle{display:inline-flex}.site-nav{width:100%;display:flex;align-items:stretch;flex-direction:column;gap:0;padding:5px 0 0}.site-header[data-enhanced=true] .site-nav{display:none}.site-header.nav-open .site-nav{display:flex}.site-nav>a{padding:12px 10px;border-top:1px solid var(--line);font-size:14px}.site-nav>a[aria-current=page]{box-shadow:none;background:var(--lavender)}.chapter-dropdown>summary{padding:12px 10px;font-size:14px}.chapter-dropdown-links{position:static;box-shadow:none;width:auto;background:#f1edf8;margin:0 0 13px;border-color:#ddd5eb;padding:7px}.chapter-dropdown-links a{font-size:13px}.chapter-page-tabs{grid-template-columns:repeat(3,minmax(0,1fr));margin-top:10px}.chapter-page-tabs a{padding:11px 3px;min-height:54px;font-size:10px}.chapter-page-tabs a>span:first-child{width:21px;height:21px;font-size:9px}.chapter-page-tabs a:nth-child(-n+3){border-bottom:1px solid var(--line)}.home-hero{grid-template-columns:1fr;padding:30px 0 23px;gap:26px}.home-hero h1{font-size:clamp(39px,10vw,58px)}.home-hero .eyebrow{font-size:9px;letter-spacing:.1em}.home-tagline{font-size:14px;margin-top:18px}.home-hero .hero-meta{margin-top:17px}.home-start{margin-top:20px}.home-brain{padding:9px 15px;max-width:500px;justify-self:center}.home-brain svg{max-height:310px}.welcome{padding:23px;font-size:14px;margin-bottom:28px}.section-intro h2{font-size:27px}.chapter-cards{grid-template-columns:1fr 1fr;gap:13px}.chapter-card{padding:21px}.chapter-card h3{font-size:23px}.chapter-card-number{font-size:31px;margin-bottom:19px}.home-watch{padding:25px;display:block}.home-watch .secondary{display:inline-flex;margin-top:21px}.page-heading{margin:30px 0 23px}.page-heading h1,.watch-heading h1{font-size:38px}.page-heading p{font-size:14px}.lesson-heading h1{font-size:28px}.chapter-pagination{gap:12px;margin-top:25px}.chapter-pagination a{padding:15px 12px}.chapter-pagination strong{font-size:13px}.chapter-pagination span{font-size:10px}.prose-page{font-size:15px}.prose-page h2{font-size:26px}.license-text{font-size:11px;padding:20px}.sources-page .sources li{grid-template-columns:25px 1fr;gap:9px;padding:19px 3px}.sources-page .sources a{font-size:15px}.sources-page .sources p{font-size:13px}.watch-related{padding:23px}.watch-related h3{font-size:23px}.related-moments{grid-template-columns:1fr}.quit-resource-list{font-size:13px}.site-footer{margin-top:34px;font-size:10px}.site-footer nav{gap:10px 18px}.site-footer nav a{font-size:11px}}
@media(max-width:460px){.chapter-cards{grid-template-columns:1fr}.chapter-card h3{font-size:25px}.chapter-card-number{font-size:35px;margin-bottom:20px}.home-brain{padding:8px 0}.site-brand{font-size:21px}.site-brand svg{width:32px}.chapter-page-tabs a{font-size:10px;gap:5px;flex-direction:column}.chapter-page-tabs a>span:first-child{width:22px;height:22px}.chapter-page-tabs a{min-height:69px}.sources-page .sources a{font-size:14px}.license-text{font-size:10px}}
@media print{.site-header,.site-footer nav,.chapter-page-tabs,.chapter-pagination,.menu-toggle,.source-dialog{display:none}.site-footer{display:block}.home-hero{grid-template-columns:1fr 1fr}.site-main{min-height:0}.prose-page{max-width:none}.lesson{break-before:auto}.chapter-cards{grid-template-columns:repeat(3,1fr)}}

.survey-invitation{margin:27px 0;padding:25px 29px;display:flex;align-items:center;justify-content:space-between;gap:24px;background:var(--lavender)}.survey-invitation p{font-size:17px;line-height:1.7;max-width:680px;color:var(--ink)}.survey-invitation .section-code{margin-bottom:9px;display:block}.survey-invitation .primary{flex:none}.quiz-source-section{margin:38px 0}.quiz-source-section>h2{font-size:32px;margin-bottom:15px}.quiz-source-section>p{color:var(--muted);line-height:1.7}.quiz-source-list{list-style:none;padding:0;margin:22px 0}.quiz-source-list li{padding:19px 0;border-top:1px solid var(--line);overflow-wrap:anywhere}.quiz-source-list a{font-size:16px}.quiz-source-list p{font-size:13px;color:var(--muted);margin-top:8px}@media(max-width:760px){.survey-invitation{display:block;padding:22px}.survey-invitation .primary{margin-top:18px}.survey-invitation p{font-size:15px}.quiz-source-section>h2{font-size:27px}}

/* Shared brand and survey invitation in the header. */
.site-header{gap:20px}
.site-brand{flex:none;gap:9px;white-space:nowrap}
.site-brand svg{display:block;flex:0 0 40px;width:40px;height:40px}
.site-brand-text{white-space:nowrap}
.site-brand-org{color:#7160d3}
.site-nav{margin-left:auto}
.survey-badge{display:inline-flex;flex:none;align-items:center;justify-content:center;gap:7px;min-height:44px;padding:8px 14px;border-radius:999px;background:#e68e76;color:#282735;text-decoration:none;font-size:13px;font-weight:650;line-height:1.2;white-space:nowrap;transition:background-color .16s ease}
.survey-badge:hover{background:#d9775d;color:#282735}
.survey-badge:focus-visible{outline:2px solid #5140ac;outline-offset:2px}
.survey-badge-dot{display:block;flex:0 0 6px;width:6px;height:6px;border-radius:50%;background:#fff;animation:survey-badge-pulse 2s ease-in-out infinite}
.survey-badge-icon{display:block;flex:0 0 17px;width:17px;height:17px}
.survey-badge-short{display:none}
.survey-badge-duration{font-weight:450}
@keyframes survey-badge-pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.85)}}
@media(max-width:980px){.site-header{gap:14px}.site-nav{gap:14px}}
@media(max-width:760px){
  .site-header{justify-content:flex-start;gap:8px}
  .site-brand{font-size:18px;gap:6px;margin-right:auto}
  .site-nav{order:4;flex-basis:100%;margin-left:0;gap:0}
  .menu-toggle{flex:none;justify-content:center;min-width:46px;padding:10px 7px;font-size:12px;gap:0}
  .menu-toggle span[aria-hidden=true]{display:none}
}
@media(max-width:479.98px){
  .site-header{gap:4px}
  .site-brand{font-size:clamp(14px,4.5vw,20px);gap:4px}
  .survey-badge{gap:6px;padding:8px 10px}
  .survey-badge-dot,.survey-badge-label,.survey-badge-duration{display:none}
  .survey-badge-short{display:inline}
  .survey-badge-icon{flex-basis:16px;width:16px;height:16px}
}
@media(prefers-reduced-motion:reduce){.survey-badge-dot{animation:none}.survey-badge{transition:none}}