:root {
  color-scheme: light;
  --ink: #141827;
  --quiet: #535d73;
  --paper: #fff;
  --blue: #2154df;
  --blue-deep: #183eaf;
  --line: #e1e7f1;
  --sans: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.65 var(--sans); }
h1, h2, h3, p, figure { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { display: block; max-width: 100%; height: auto; }
[id] { scroll-margin-top: 20px; }
:focus-visible { outline: 3px solid #527eff; outline-offset: 4px; }
.frame { width: min(1304px, calc(100% - 72px)); margin-inline: auto; }
.skip-link { position: absolute; z-index: 5; top: 10px; left: 10px; transform: translateY(-160%); background: white; padding: 10px 15px; }
.skip-link:focus { transform: none; }

.site-nav { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 20px; min-height: 74px; }
.wordmark { justify-self: start; display: inline-flex; align-items: center; gap: 9px; font-size: 21px; line-height: 1.2; font-weight: 800; letter-spacing: -.055em; white-space: nowrap; }
.site-nav .wordmark-logo { width: 33px; height: auto; flex: none; }
.brand-symbol { display: inline-grid; place-items: center; width: 25px; height: 25px; flex: none; border-radius: 7px; background: linear-gradient(145deg, #2a70ff 6%, #7545ef 100%); box-shadow: inset 0 0 0 1px #ffffff40; }
.brand-symbol::after { content: ""; width: 12px; height: 12px; border: 1.8px solid #fff; border-left-color: #ffffff80; transform: rotate(45deg); border-radius: 3px; }
.site-nav nav { display: flex; align-items: center; gap: clamp(14px, 3vw, 39px); color: #31394b; font-size: 14px; font-weight: 650; }
.site-nav > .pill { justify-self: end; background: #f3f6fd; color: #2946a1; border-color: transparent; }
.site-nav > .pill:hover { background: #e8eeff; }
.site-nav nav a:hover, .text-link:hover, .columns a:hover, .site-footer a:last-child:hover { text-decoration: underline; text-underline-offset: 4px; }
.pill { display: inline-flex; align-items: center; justify-content: center; gap: .55em; border: 1px solid transparent; border-radius: 999px; background: var(--blue); color: white; padding: 11px 20px; font-size: 14px; line-height: 1.45; font-weight: 700; transition: background-color 160ms, border-color 160ms; }
.pill:hover { background: var(--blue-deep); }
.pill.small { padding: 8px 15px; font-size: 13px; }
.pill.secondary { background: #fff9; color: #273960; border-color: #cbd7f3; }
.pill.secondary:hover { background: #fff; border-color: #9db4eb; }
.actions { display: flex; justify-content: center; gap: 9px; flex-wrap: wrap; }

.content-section { padding-block: clamp(48px, 7vw, 96px); border-bottom: 1px solid var(--line); }
.section-head { margin-bottom: clamp(24px, 3.6vw, 46px); }
.section-label { display: inline-block; color: #3858ac; font-size: 13px; font-weight: 750; }
.section-head h2 { font-size: clamp(34px, 5.15vw, 65px); letter-spacing: -.075em; line-height: 1.13; font-weight: 800; margin: .12em 0 .23em; text-wrap: balance; }
.section-head p { color: var(--quiet); max-width: 38em; }
.section-head.split { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); gap: 14px 50px; align-items: end; }
.section-head.split > .text-link { justify-self: end; }
.columns { display: grid; gap: clamp(15px, 3vw, 38px); }
.columns.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.columns.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.columns > * { padding-top: 15px; border-top: 1px solid var(--line); }
.columns h3, .toolkit h3 { font-size: clamp(18px, 2vw, 24px); line-height: 1.35; letter-spacing: -.04em; font-weight: 750; }
.columns p { margin-top: 7px; color: var(--quiet); }
.columns a, .text-link { display: inline-block; margin-top: 13px; color: var(--blue-deep); font-size: 14px; font-weight: 750; }

.membership { margin-top: clamp(43px, 6.5vw, 86px); background: radial-gradient(ellipse at 50% 62%, #202247 0, #101427 36%, #080b13 75%); color: #f7f9ff; }
.membership-inner { padding-block: clamp(49px, 7.7vw, 100px); }
.membership-head { text-align: center; }
.membership-head .section-label { color: #aabaff; }
.membership-head h2 span { color: #c5d1ff; }
.membership-head p { color: #bec7df; margin-inline: auto; }
.membership .pill { background: #f5f7ff; color: #1c2442; }
.membership .pill:hover { background: #e1e8ff; }
.membership .pill.secondary { border-color: #68779a; color: #f0f3ff; background: transparent; }
.membership .pill.secondary:hover { background: #26304f; }
.all-benefits { max-width: 860px; margin: 22px auto 0; }
.all-benefits summary { width: fit-content; margin-inline: auto; color: #c4cfff; cursor: pointer; font-size: 13px; font-weight: 700; }
.rights-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; margin-top: 14px; }
.rights-list a { display: grid; grid-template-columns: 1fr auto; gap: 3px 12px; padding: 11px 0; border-top: 1px solid #414b6a; }
.rights-list h3 { font-size: 15px; }
.rights-list p { color: #bec7df; font-size: 13px; grid-column: 1; grid-row: 2; }
.rights-list a > span { color: #b9c8ff; grid-column: 2; grid-row: 1; }
.rights-list a:hover h3 { text-decoration: underline; }

.library-band { background: radial-gradient(ellipse at 80% 88%, #6852d7 0%, transparent 55%), linear-gradient(155deg, #0c1f5a, #1b52bf 92%); color: white; padding-block: clamp(47px, 7vw, 94px); }
.wall-heading { text-align: center; }
.wall-heading p { color: #e1ebff; margin-inline: auto; }
.sample-wall { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: clamp(10px, 1.55vw, 21px); align-items: stretch; }
.wall-card { --wall-ink: #15285b; min-height: clamp(176px, 21vw, 280px); display: flex; flex-direction: column; align-items: flex-start; justify-content: space-between; gap: 9px; padding: clamp(13px, 2.2vw, 29px); border-radius: clamp(12px, 1.8vw, 22px); border: 1px solid #ffffff82; color: var(--wall-ink); box-shadow: 0 14px 24px #06153b36; transition: transform 180ms ease; }
.wall-card:hover { transform: translateY(-5px); }
.wall-hypit { background: radial-gradient(ellipse at 92% 15%, #dbe8ff, transparent 46%), linear-gradient(155deg, #f6f9ff, #c7d9ff); }
.wall-chatcut { background: radial-gradient(ellipse at 105% 90%, #836fff, transparent 71%), #263983; --wall-ink: #fff; }
.wall-skill { background: radial-gradient(ellipse at 100% 70%, #cbabff, transparent 65%), linear-gradient(140deg, #f7f0ff, #d9d3ff); --wall-ink: #342057; }
.wall-daily { background: radial-gradient(ellipse at 107% 22%, #a4c7ff, transparent 67%), linear-gradient(160deg, #e5edff, #fafaff); }
.wall-type, .wall-link { font-size: 12px; font-weight: 700; }
.wall-card strong { font-size: clamp(22px, 3vw, 42px); line-height: 1.13; letter-spacing: -.06em; font-weight: 820; }
.wall-daily strong { font-size: clamp(21px, 2.65vw, 37px); text-wrap: balance; }
.wall-link { display: flex; align-items: center; gap: 5px; }
.wall-footer { display: grid; justify-items: center; margin-top: 27px; }
.wall-footer .pill { background: #f7faff; color: #1a3378; }
.wall-footer .pill:hover { background: #e1eaff; }
.topic-index { display: flex; justify-content: center; gap: 7px; flex-wrap: wrap; margin-top: 17px; }
.topic-index a { color: #fff; padding: 5px 11px; border: 1px solid #ffffff50; border-radius: 99px; font-size: 12px; }
.topic-index a:hover { background: #ffffff20; }

.toolkit { display: grid; grid-template-columns: minmax(148px, .5fr) 1.5fr; gap: 0 22px; margin-top: 32px; padding: clamp(15px, 3.2vw, 37px); background: #f2f6ff; border-radius: 19px; }
.toolkit ul { margin: 0; padding: 0; list-style: none; }
.toolkit li { display: grid; grid-template-columns: minmax(160px, 1fr) 1.4fr; gap: 4px 13px; padding: 8px 0; border-top: 1px solid #dce5f8; font-size: 14px; }
.toolkit li span { color: var(--quiet); }
.toolkit .text-link { grid-column: 2; }
.updates-list a { display: grid; grid-template-columns: 58px 1fr auto; gap: 13px; padding: 14px 0; border-top: 1px solid var(--line); }
.updates-list a:last-child { border-bottom: 1px solid var(--line); }
.updates-list time { color: #405999; font-variant-numeric: tabular-nums; }
.updates-list h3 { font-size: 17px; }
.updates-list p { margin-top: 3px; color: var(--quiet); font-size: 14px; }
.updates-list a:hover h3 { text-decoration: underline; text-underline-offset: 4px; }
.host-section { display: grid; grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr); gap: clamp(21px, 6.5vw, 88px); align-items: center; }
.host-section figure { overflow: hidden; background: #eef2fb; border-radius: 23px; }
.host-section img { width: 100%; height: clamp(280px, 40vw, 490px); object-fit: cover; object-position: 50% 39%; }
.host-section .section-head { margin-bottom: 0; }
.join-steps { padding: 0; margin: 0; list-style: none; }
.join-steps li > span { display: block; margin-bottom: 9px; color: #3d56a6; font-size: 25px; font-weight: 700; }
.join-actions { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 12px; margin-top: 23px; }
.join-actions summary { padding: 9px 15px; border: 1px solid #a4b4df; border-radius: 99px; color: #25469e; font-size: 14px; font-weight: 750; cursor: pointer; }
.join-actions summary:hover { background: #eef3ff; }
.join-actions details div { padding: 12px; }
.join-actions details img { width: 145px; margin-top: 8px; border: 1px solid var(--line); border-radius: 8px; }
.product-link { display: flex; justify-content: space-between; align-items: center; gap: 19px; padding: clamp(16px, 3.5vw, 43px); border-radius: 23px; background: linear-gradient(135deg, #eff5ff, #f2efff); }
.product-link:hover { background: #e8ecff; }
.product-link h2 { margin: 5px 0; font-size: clamp(22px, 3.45vw, 44px); font-weight: 800; letter-spacing: -.06em; line-height: 1.2; }
.product-link p { color: var(--quiet); }
.product-link > div:last-child { text-align: right; white-space: nowrap; }
.product-link strong { display: block; font-size: clamp(31px, 4vw, 54px); font-weight: 780; line-height: 1.15; letter-spacing: -.05em; }
.product-link > div:last-child span { color: #2e4a9b; font-size: 13px; font-weight: 750; }
.site-footer { display: flex; justify-content: space-between; align-items: center; gap: 9px; min-height: 76px; color: var(--quiet); font-size: 13px; }
.site-footer .wordmark { color: var(--ink); }

@media (max-width: 850px) {
  .frame { width: calc(100% - 46px); }
}
@media (max-width: 660px) {
  .frame { width: calc(100% - 28px); }
  .site-nav { grid-template-columns: 1fr 1fr; gap: 8px 11px; min-height: 0; padding: 12px 0; }
  .site-nav nav { grid-column: 1 / -1; grid-row: 2; justify-content: space-between; gap: 7px; font-size: 12px; }
  .wordmark { font-size: 19px; }
  .brand-symbol { width: 22px; height: 22px; }
  .sample-wall, .columns.four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .wall-card { min-height: 168px; }
  .wall-type, .wall-link { font-size: 11px; }
  .section-head.split, .host-section, .toolkit { grid-template-columns: 1fr; }
  .section-head.split > .text-link { justify-self: start; margin-top: 0; }
  .toolkit ul { margin-top: 12px; }
  .toolkit li { grid-template-columns: 1fr; }
  .toolkit .text-link { grid-column: 1; }
  .host-section img { height: clamp(280px, 78vw, 420px); }
}
@media (max-width: 410px) {
  .pill.small { padding-inline: 11px; }
  .columns.three, .rights-list { grid-template-columns: 1fr; }
  .columns p { font-size: 14px; }
  .product-link { flex-wrap: wrap; gap: 11px; }
  .product-link > div:last-child { text-align: left; }
  .site-footer { font-size: 11px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .pill, .wall-card { transition: none; }
}