:root {
  --sk-color-background: #f8fbfc;
  --sk-color-surface: #ffffff;
  --sk-color-surface-muted: #eef7f8;
  --sk-color-surface-strong: #dff2f4;
  --sk-color-text: #102a43;
  --sk-color-text-muted: #486581;
  --sk-color-border: #d9e7ea;
  --sk-color-primary: #087e8b;
  --sk-color-primary-hover: #056772;
  --sk-color-primary-active: #044f58;
  --sk-color-primary-contrast: #ffffff;
  --sk-color-accent: #26c6da;
  --sk-color-lime: #b7e36b;
  --sk-color-sun: #ffd166;
  --sk-color-coral: #ff8f70;
  --sk-color-success: #367a55;
  --sk-color-warning: #a65f00;
  --sk-color-danger: #b53a3a;
  --sk-color-focus: #0b7189;

  --sk-font-sans: "Avenir Next", Avenir, "Segoe UI", Helvetica, Arial, sans-serif;
  --sk-font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sk-font-size-xs: 0.75rem;
  --sk-font-size-sm: 0.875rem;
  --sk-font-size-base: 1rem;
  --sk-font-size-lg: 1.125rem;
  --sk-font-size-xl: 1.375rem;
  --sk-font-size-2xl: clamp(1.75rem, 3vw, 2.5rem);
  --sk-font-size-display: clamp(2.5rem, 6vw, 5rem);
  --sk-font-weight-regular: 400;
  --sk-font-weight-medium: 600;
  --sk-font-weight-bold: 800;
  --sk-line-height-tight: 1.1;
  --sk-line-height-heading: 1.22;
  --sk-line-height-body: 1.65;

  --sk-space-0: 0;
  --sk-space-1: 0.5rem;
  --sk-space-2: 1rem;
  --sk-space-3: 1.5rem;
  --sk-space-4: 2rem;
  --sk-space-5: 2.5rem;
  --sk-space-6: 3rem;
  --sk-space-8: 4rem;
  --sk-space-10: 5rem;
  --sk-space-12: 6rem;

  --sk-radius-xs: 0.375rem;
  --sk-radius-sm: 0.75rem;
  --sk-radius-md: 1.25rem;
  --sk-radius-lg: 2rem;
  --sk-radius-full: 999px;

  --sk-shadow-sm: 0 0.4rem 1rem rgba(16, 42, 67, 0.07);
  --sk-shadow-md: 0 1rem 2.25rem rgba(16, 42, 67, 0.09);
  --sk-shadow-lg: 0 1.5rem 3.5rem rgba(16, 42, 67, 0.13);
  --sk-duration-fast: 150ms;
  --sk-duration-base: 220ms;
  --sk-ease-standard: ease-out;

  --sk-container-width: 73.75rem;
  --sk-section-space: clamp(4.5rem, 8vw, 7rem);

  /* Homepage aliases keep existing modular sections compatible. */
  --sk-home-background: var(--sk-color-background);
  --sk-home-surface: var(--sk-color-surface);
  --sk-home-surface-muted: var(--sk-color-surface-muted);
  --sk-home-ink: var(--sk-color-text);
  --sk-home-ink-soft: var(--sk-color-text-muted);
  --sk-home-line: var(--sk-color-border);
  --sk-home-primary: var(--sk-color-primary);
  --sk-home-primary-hover: var(--sk-color-primary-hover);
  --sk-home-accent: var(--sk-color-accent);
  --sk-home-lime: var(--sk-color-lime);
  --sk-home-sun: var(--sk-color-sun);
  --sk-home-coral: var(--sk-color-coral);
  --sk-home-radius-sm: var(--sk-radius-sm);
  --sk-home-radius-md: var(--sk-radius-md);
  --sk-home-radius-lg: var(--sk-radius-lg);
  --sk-home-shadow: var(--sk-shadow-md);
  --sk-home-space-1: var(--sk-space-1);
  --sk-home-space-2: var(--sk-space-2);
  --sk-home-space-3: var(--sk-space-3);
  --sk-home-space-4: var(--sk-space-4);
  --sk-home-space-6: var(--sk-space-6);
  --sk-home-space-8: var(--sk-space-8);
  --sk-home-motion: var(--sk-duration-base) var(--sk-ease-standard);
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--sk-color-background);
  color: var(--sk-color-text);
  font-family: var(--sk-font-sans);
  font-size: var(--sk-font-size-base);
  line-height: var(--sk-line-height-body);
}

body :where(h1, h2, h3, h4, h5, h6) {
  color: var(--sk-color-text);
  font-family: var(--sk-font-sans);
  font-weight: var(--sk-font-weight-bold);
  line-height: var(--sk-line-height-heading);
}

body :where(a, button, input, select, textarea):focus-visible {
  outline: 0.1875rem solid var(--sk-color-focus);
  outline-offset: 0.1875rem;
}

::selection {
  background: var(--sk-color-sun);
  color: var(--sk-color-text);
}

.sk-container {
  width: min(calc(100% - 3rem), var(--sk-container-width));
  margin-inline: auto;
}

.sk-page-main {
  min-height: 55vh;
  padding-block: var(--sk-section-space);
}

.sk-page-main > article > :first-child {
  margin-top: 0;
}

.sk-section {
  padding-block: var(--sk-section-space);
}

.sk-section--compact {
  padding-block: clamp(3rem, 6vw, 4.5rem);
}

.sk-section--wide {
  padding-block: clamp(6rem, 10vw, 9rem);
}

.sk-section-header {
  display: grid;
  gap: var(--sk-space-2);
  max-width: 46rem;
  margin-bottom: var(--sk-space-6);
}

.sk-grid {
  display: grid;
  gap: var(--sk-space-3);
}

.sk-grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.sk-grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.sk-grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.sk-grid--auto {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
}

.sk-button,
.sk-home-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.75rem 1.25rem;
  border: 0.125rem solid transparent;
  border-radius: var(--sk-radius-full);
  background: var(--sk-color-primary);
  color: var(--sk-color-primary-contrast);
  font: inherit;
  font-weight: var(--sk-font-weight-bold);
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--sk-duration-fast) var(--sk-ease-standard), border-color var(--sk-duration-fast) var(--sk-ease-standard), color var(--sk-duration-fast) var(--sk-ease-standard), transform var(--sk-duration-fast) var(--sk-ease-standard), box-shadow var(--sk-duration-fast) var(--sk-ease-standard);
}

.sk-button:hover,
.sk-home-button:hover {
  background: var(--sk-color-primary-hover);
  color: var(--sk-color-primary-contrast);
  transform: translateY(-0.125rem);
  box-shadow: var(--sk-shadow-sm);
}

.sk-button:active,
.sk-home-button:active {
  background: var(--sk-color-primary-active);
  transform: translateY(0);
  box-shadow: none;
}

.sk-button--secondary,
.sk-home-button--secondary {
  background: var(--sk-color-sun);
  color: var(--sk-color-text);
}

.sk-button--secondary:hover,
.sk-home-button--secondary:hover {
  background: #f4bf43;
  color: var(--sk-color-text);
}

.sk-button--outline,
.sk-home-button--outline {
  border-color: var(--sk-color-primary);
  background: transparent;
  color: var(--sk-color-primary);
}

.sk-button--outline:hover,
.sk-home-button--outline:hover {
  background: var(--sk-color-primary);
  color: var(--sk-color-primary-contrast);
}

.sk-button--light,
.sk-home-button--light {
  background: var(--sk-color-surface);
  color: var(--sk-color-primary);
}

.sk-button--small {
  min-height: 2.5rem;
  padding: 0.55rem 1rem;
  font-size: var(--sk-font-size-sm);
}

.sk-button[disabled],
.sk-button.is-disabled {
  opacity: 0.55;
  pointer-events: none;
}

.sk-card {
  padding: var(--sk-space-4);
  border: 0.0625rem solid var(--sk-color-border);
  border-radius: var(--sk-radius-md);
  background: var(--sk-color-surface);
  box-shadow: var(--sk-shadow-sm);
}

.sk-card--muted {
  background: var(--sk-color-surface-muted);
  box-shadow: none;
}

.sk-card--interactive {
  transition: border-color var(--sk-duration-base) var(--sk-ease-standard), transform var(--sk-duration-base) var(--sk-ease-standard), box-shadow var(--sk-duration-base) var(--sk-ease-standard);
}

.sk-card--interactive:hover {
  border-color: var(--sk-color-accent);
  transform: translateY(-0.25rem);
  box-shadow: var(--sk-shadow-md);
}

.sk-card__eyebrow {
  color: var(--sk-color-primary);
  font-size: var(--sk-font-size-xs);
  font-weight: var(--sk-font-weight-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.sk-card__title {
  margin-block: var(--sk-space-1);
  font-size: var(--sk-font-size-xl);
}

.sk-card__text {
  margin: 0;
  color: var(--sk-color-text-muted);
}

.sk-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 0.0625rem solid rgba(217, 231, 234, 0.9);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 0.25rem 1rem rgba(16, 42, 67, 0.04);
  backdrop-filter: blur(0.75rem);
}

.sk-header-inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--sk-space-3);
  min-height: 5rem;
}

.sk-header-logo {
  color: var(--sk-color-text);
  font-weight: var(--sk-font-weight-bold);
  text-decoration: none;
}

.sk-nav {
  display: flex;
  justify-content: center;
  overflow: visible;
}

.sk-nav-list,
.sk-footer-menu {
  margin: 0;
  padding: 0;
  list-style: none;
}

.sk-nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(0.55rem, 1.05vw, 1.1rem);
  white-space: nowrap;
}

.sk-nav-list > li > a,
.sk-nav-dropdown-toggle {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0;
  border-bottom: 0.125rem solid transparent;
  color: var(--sk-color-text);
  font-size: var(--sk-font-size-sm);
  font-weight: var(--sk-font-weight-medium);
  text-decoration: none;
  transition: border-color var(--sk-duration-fast) var(--sk-ease-standard), color var(--sk-duration-fast) var(--sk-ease-standard);
}

.sk-nav-dropdown-toggle {
  border-top: 0;
  border-right: 0;
  border-left: 0;
  background: transparent;
  cursor: pointer;
  font-family: inherit;
}

.sk-nav-dropdown-toggle svg {
  width: 0.7rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
  transition: transform var(--sk-duration-fast) var(--sk-ease-standard);
}

.sk-nav-list > li > a:hover,
.sk-nav-list > li > a:focus-visible,
.sk-nav-dropdown-toggle:hover,
.sk-nav-dropdown-toggle:focus-visible,
.sk-nav-dropdown.open > .sk-nav-dropdown-toggle,
.sk-nav-list .current-menu-item > a,
.sk-nav-list .current_page_item > a {
  border-color: var(--sk-color-primary);
  color: var(--sk-color-primary);
}

.sk-nav-dropdown {
  position: relative;
}

.sk-nav-dropdown.open > .sk-nav-dropdown-toggle svg {
  transform: rotate(180deg);
}

.sk-nav-submenu {
  position: absolute;
  z-index: 10;
  top: calc(100% + 0.35rem);
  left: 50%;
  display: grid;
  min-width: 15.5rem;
  visibility: hidden;
  margin: 0;
  padding: var(--sk-space-1);
  transform: translate(-50%, 0.4rem);
  border: 0.0625rem solid var(--sk-color-border);
  border-radius: var(--sk-radius-md);
  background: var(--sk-color-surface);
  box-shadow: var(--sk-shadow-md);
  list-style: none;
  opacity: 0;
  transition: opacity var(--sk-duration-fast) var(--sk-ease-standard), transform var(--sk-duration-fast) var(--sk-ease-standard), visibility var(--sk-duration-fast);
}

.sk-nav-submenu a {
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  padding: 0.55rem var(--sk-space-2);
  border-radius: var(--sk-radius-sm);
  color: var(--sk-color-text);
  font-size: var(--sk-font-size-sm);
  text-decoration: none;
}

.sk-nav-submenu a:hover,
.sk-nav-submenu a:focus-visible {
  background: var(--sk-color-surface-muted);
  color: var(--sk-color-primary);
}

.sk-nav-dropdown:hover > .sk-nav-submenu,
.sk-nav-dropdown:focus-within > .sk-nav-submenu,
.sk-nav-dropdown.open > .sk-nav-submenu {
  visibility: visible;
  transform: translate(-50%, 0);
  opacity: 1;
}

.sk-header-icons {
  display: flex;
  align-items: center;
  gap: var(--sk-space-1);
}

.sk-account-menu {
  position: relative;
}

.sk-account-toggle {
  padding: 0;
  cursor: pointer;
  font-family: inherit;
}

.sk-account-dropdown {
  position: absolute;
  z-index: 20;
  top: calc(100% + 0.55rem);
  right: 0;
  display: grid;
  width: 13.5rem;
  visibility: hidden;
  padding: var(--sk-space-1);
  transform: translateY(0.4rem);
  border: 0.0625rem solid var(--sk-color-border);
  border-radius: var(--sk-radius-md);
  background: var(--sk-color-surface);
  box-shadow: var(--sk-shadow-md);
  opacity: 0;
  transition: opacity var(--sk-duration-fast) var(--sk-ease-standard), transform var(--sk-duration-fast) var(--sk-ease-standard), visibility var(--sk-duration-fast);
}

.sk-account-dropdown::before {
  position: absolute;
  top: -0.35rem;
  right: 1rem;
  width: 0.65rem;
  height: 0.65rem;
  transform: rotate(45deg);
  border-top: 0.0625rem solid var(--sk-color-border);
  border-left: 0.0625rem solid var(--sk-color-border);
  background: var(--sk-color-surface);
  content: '';
}

.sk-account-menu:hover .sk-account-dropdown,
.sk-account-menu:focus-within .sk-account-dropdown,
.sk-account-menu.open .sk-account-dropdown {
  visibility: visible;
  transform: translateY(0);
  opacity: 1;
}

.sk-account-dropdown__title {
  padding: 0.6rem var(--sk-space-2);
  color: var(--sk-color-text-muted);
  font-size: var(--sk-font-size-xs);
  font-weight: var(--sk-font-weight-bold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sk-account-dropdown > a {
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  padding: 0.55rem var(--sk-space-2);
  border-radius: var(--sk-radius-sm);
  color: var(--sk-color-text);
  font-size: var(--sk-font-size-sm);
  text-decoration: none;
}

.sk-account-dropdown > a:hover,
.sk-account-dropdown > a:focus-visible {
  background: var(--sk-color-surface-muted);
  color: var(--sk-color-primary);
}

.sk-account-social {
  margin-top: var(--sk-space-1);
  padding: var(--sk-space-1) var(--sk-space-2) 0;
  border-top: 0.0625rem solid var(--sk-color-border);
}

.sk-icon-link,
.sk-nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.75rem;
  min-height: 2.75rem;
  border: 0.0625rem solid var(--sk-color-border);
  border-radius: var(--sk-radius-full);
  background: var(--sk-color-surface);
  color: var(--sk-color-text);
  transition: background-color var(--sk-duration-fast) var(--sk-ease-standard), border-color var(--sk-duration-fast) var(--sk-ease-standard), color var(--sk-duration-fast) var(--sk-ease-standard);
}

.sk-icon-link:hover,
.sk-nav-toggle:hover {
  border-color: var(--sk-color-accent);
  background: var(--sk-color-surface-muted);
  color: var(--sk-color-primary);
}

.sk-nav-toggle {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
}

.sk-nav-toggle span {
  display: block;
  width: 1.1rem;
  height: 0.125rem;
  background: currentColor;
}

.sk-cta-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sk-space-4);
  padding: clamp(2rem, 5vw, 4rem);
  border-radius: var(--sk-radius-lg);
  background: var(--sk-color-primary);
  color: var(--sk-color-primary-contrast);
  box-shadow: var(--sk-shadow-md);
}

.sk-cta-band :where(h2, h3, p) {
  color: inherit;
}

.sk-cta-band__content {
  max-width: 44rem;
}

.sk-cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sk-space-2);
  flex: 0 0 auto;
}

.sk-cta-band--accent {
  background: linear-gradient(135deg, var(--sk-color-primary), #0c9dad);
}

.sk-cta-band--light {
  border: 0.0625rem solid var(--sk-color-border);
  background: var(--sk-color-surface-muted);
  color: var(--sk-color-text);
  box-shadow: none;
}

@media (max-width: 64rem) {
  .sk-header-inner {
    gap: var(--sk-space-2);
  }

  .sk-nav-list {
    gap: 0.65rem;
  }

  .sk-nav-list > li > a,
  .sk-nav-dropdown-toggle {
    font-size: var(--sk-font-size-xs);
  }

  .sk-grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sk-grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 48rem) {
  .sk-container {
    width: min(calc(100% - 2rem), var(--sk-container-width));
  }

  .sk-grid--2,
  .sk-grid--3,
  .sk-grid--4 {
    grid-template-columns: 1fr;
  }

  .sk-header-inner {
    display: flex;
    flex-wrap: nowrap;
    min-height: 4.5rem;
  }

  .sk-nav-toggle {
    display: inline-flex;
  }

  .sk-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    order: initial;
    display: none;
    width: auto;
    max-height: calc(100vh - 4.5rem);
    overflow-y: auto;
    padding: var(--sk-space-2);
    border-top: 0.0625rem solid var(--sk-color-border);
    background: var(--sk-color-surface);
    box-shadow: var(--sk-shadow-md);
  }

  .sk-nav.open {
    display: block;
  }

  .sk-nav.open .sk-nav-list {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0;
    white-space: normal;
  }

  .sk-nav-list a {
    display: flex;
    min-height: 3rem;
    align-items: center;
    border-bottom: 0.0625rem solid var(--sk-color-border);
  }

  .sk-nav-dropdown-toggle {
    width: 100%;
    min-height: 3rem;
    justify-content: space-between;
    border-bottom: 0.0625rem solid var(--sk-color-border);
    color: var(--sk-color-text);
    font-size: var(--sk-font-size-sm);
    text-align: left;
  }

  .sk-nav-submenu {
    position: static;
    display: none;
    min-width: 0;
    visibility: visible;
    padding: 0 0 0 var(--sk-space-2);
    transform: none;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    opacity: 1;
  }

  .sk-nav-dropdown.open > .sk-nav-submenu {
    display: grid;
    transform: none;
  }

  .sk-nav-submenu a {
    border-bottom: 0.0625rem solid var(--sk-color-border);
    border-radius: 0;
  }

  .sk-cta-band {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 30rem) {
  .sk-header-icons {
    gap: 0.25rem;
  }

  .sk-icon-link,
  .sk-nav-toggle {
    min-width: 2.5rem;
    min-height: 2.5rem;
  }

  .sk-account-dropdown {
    right: -3rem;
    width: min(13.5rem, calc(100vw - 2rem));
  }

  .sk-cta-band__actions,
  .sk-cta-band__actions .sk-button {
    width: 100%;
  }
}

.sk-home-main {
  overflow: hidden;
  background: var(--sk-home-background);
  color: var(--sk-home-ink);
}

.sk-home-container {
  width: min(calc(100% - 3rem), var(--sk-container-width));
  margin-inline: auto;
}

.sk-home-section {
  padding-block: clamp(4.5rem, 8vw, 7rem);
}

.sk-section-heading {
  width: min(100%, 720px);
  margin: 0 auto clamp(2.5rem, 5vw, 4rem);
  text-align: center;
}

.sk-section-heading--left {
  margin-inline: 0;
  margin-bottom: 0;
  text-align: left;
}

.sk-section-eyebrow,
.sk-home-kicker {
  margin: 0 0 var(--sk-home-space-2);
  color: var(--sk-home-primary);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  line-height: 1.4;
  text-transform: uppercase;
}

.sk-section-heading h2,
.sk-home-why h2,
.sk-home-split-card h2,
.sk-subscription-card h2 {
  margin: 0;
  color: var(--sk-home-ink);
  font-size: clamp(2rem, 4vw, 3.45rem);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1.04;
}

.sk-section-intro {
  margin: var(--sk-home-space-3) auto 0;
  color: var(--sk-home-ink-soft);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.7;
}

.sk-section-heading--left .sk-section-intro {
  margin-left: 0;
}

.sk-home-button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  padding: 0.8rem 1.35rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 750;
  line-height: 1.2;
  text-decoration: none;
  transition: background-color var(--sk-home-motion), border-color var(--sk-home-motion), color var(--sk-home-motion), transform var(--sk-home-motion);
}

.sk-home-button:hover {
  transform: translateY(-2px);
}

.sk-home-button:focus-visible,
.sk-category-card:focus-visible,
.sk-subject-grid a:focus-visible,
.sk-home-learning-grid a:focus-visible {
  outline: 3px solid var(--sk-home-sun);
  outline-offset: 4px;
}

.sk-home-button--primary {
  background: var(--sk-home-ink);
  color: var(--sk-home-surface);
}

.sk-home-button--primary:hover {
  background: var(--sk-home-primary);
  color: var(--sk-home-surface);
}

.sk-home-button--secondary {
  border-color: var(--sk-home-line);
  background: var(--sk-home-surface);
  color: var(--sk-home-ink);
}

.sk-home-button--secondary:hover {
  border-color: var(--sk-home-primary);
  color: var(--sk-home-primary);
}

.sk-home-button--light {
  background: var(--sk-home-surface);
  color: var(--sk-home-ink);
}

.sk-home-hero {
  position: relative;
  display: grid;
  min-height: 690px;
  align-items: center;
  padding-block: clamp(4.5rem, 9vw, 7rem);
  background:
    linear-gradient(rgba(8, 126, 139, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8, 126, 139, 0.055) 1px, transparent 1px),
    radial-gradient(circle at 78% 26%, rgba(38, 198, 218, 0.18), transparent 28rem),
    var(--sk-home-background);
  background-size: 32px 32px, 32px 32px, auto, auto;
}

.sk-home-hero::after {
  position: absolute;
  right: -8rem;
  bottom: -9rem;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  background: var(--sk-home-lime);
  content: "";
  filter: blur(90px);
  opacity: 0.18;
}

.sk-home-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(420px, 0.94fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 6rem);
}

.sk-home-kicker {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.sk-home-kicker span {
  width: 2rem;
  height: 2px;
  background: var(--sk-home-accent);
}

.sk-home-hero h1 {
  max-width: 760px;
  margin: 0;
  color: var(--sk-home-ink);
  font-size: clamp(3rem, 6vw, 5.75rem);
  font-weight: 850;
  letter-spacing: -0.06em;
  line-height: 0.96;
}

.sk-home-hero__lead {
  max-width: 650px;
  margin: var(--sk-home-space-4) 0 0;
  color: var(--sk-home-ink-soft);
  font-size: clamp(1.05rem, 1.7vw, 1.3rem);
  line-height: 1.7;
}

.sk-home-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: var(--sk-home-space-4);
}

.sk-home-trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sk-home-space-3);
  margin: var(--sk-home-space-4) 0 0;
  padding: 0;
  color: var(--sk-home-ink-soft);
  font-size: 0.85rem;
  font-weight: 650;
  list-style: none;
}

.sk-home-trust-list li::before {
  margin-right: 0.5rem;
  color: var(--sk-home-primary);
  content: "✓";
}

.sk-home-hero__visual {
  position: relative;
  min-height: 510px;
  border: 1px solid rgba(8, 126, 139, 0.18);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.7);
  box-shadow: var(--sk-home-shadow);
  isolation: isolate;
}

.sk-orbit {
  position: absolute;
  inset: 11%;
  border: 1px solid var(--sk-home-line);
  border-radius: 50%;
}

.sk-orbit--inner {
  inset: 27%;
  border-style: dashed;
}

.sk-orbit span {
  position: absolute;
  width: 1.15rem;
  height: 1.15rem;
  border: 3px solid var(--sk-home-surface);
  border-radius: 50%;
  background: var(--sk-home-accent);
  box-shadow: 0 0 0 1px var(--sk-home-line);
}

.sk-orbit span:nth-child(1) { top: 8%; left: 24%; }
.sk-orbit span:nth-child(2) { right: 7%; bottom: 25%; background: var(--sk-home-coral); }
.sk-orbit span:nth-child(3) { bottom: 2%; left: 31%; background: var(--sk-home-lime); }
.sk-orbit--inner span:nth-child(1) { top: 10%; left: 62%; background: var(--sk-home-sun); }
.sk-orbit--inner span:nth-child(2) { right: auto; bottom: 8%; left: 16%; }

.sk-hero-core {
  position: absolute;
  inset: 36%;
  display: grid;
  place-content: center;
  border-radius: 50%;
  background: var(--sk-home-ink);
  color: var(--sk-home-surface);
  text-align: center;
}

.sk-hero-core strong {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  letter-spacing: 0.08em;
}

.sk-hero-core small {
  color: var(--sk-home-accent);
  font-size: 0.65rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.sk-hero-note {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--sk-home-line);
  border-radius: 999px;
  background: var(--sk-home-surface);
  box-shadow: 0 0.75rem 2rem rgba(16, 42, 67, 0.1);
  color: var(--sk-home-ink);
  font-size: 0.78rem;
  font-weight: 750;
}

.sk-hero-note span { color: var(--sk-home-primary); font-size: 0.68rem; }
.sk-hero-note--one { top: 8%; left: 2%; }
.sk-hero-note--two { top: 25%; right: -4%; }
.sk-hero-note--three { right: 8%; bottom: 7%; }

.sk-home-categories {
  background: var(--sk-home-surface);
}

.sk-category-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sk-home-space-2);
}

.sk-category-card {
  --sk-category-tint: var(--sk-home-surface-muted);
  position: relative;
  display: flex;
  min-height: 310px;
  flex-direction: column;
  padding: var(--sk-home-space-4);
  overflow: hidden;
  border: 1px solid var(--sk-home-line);
  border-radius: var(--sk-home-radius-md);
  background: linear-gradient(145deg, var(--sk-home-surface) 45%, var(--sk-category-tint));
  color: var(--sk-home-ink);
  text-decoration: none;
  transition: border-color var(--sk-home-motion), box-shadow var(--sk-home-motion), transform var(--sk-home-motion);
}

.sk-category-card--2 { --sk-category-tint: rgba(255, 209, 102, 0.2); }
.sk-category-card--3 { --sk-category-tint: rgba(255, 143, 112, 0.16); }

.sk-category-card:hover {
  border-color: var(--sk-home-primary);
  box-shadow: var(--sk-home-shadow);
  color: var(--sk-home-ink);
  transform: translateY(-5px);
}

.sk-category-card__code {
  display: grid;
  width: 4.25rem;
  height: 4.25rem;
  place-items: center;
  border: 1px solid var(--sk-home-line);
  border-radius: 50%;
  background: var(--sk-home-surface);
  color: var(--sk-home-primary);
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.08em;
}

.sk-category-card__number {
  position: absolute;
  top: var(--sk-home-space-4);
  right: var(--sk-home-space-4);
  color: var(--sk-home-ink-soft);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
}

.sk-category-card h3 {
  margin: auto 0 0.7rem;
  color: var(--sk-home-ink);
  font-size: 1.35rem;
  line-height: 1.2;
}

.sk-category-card p {
  min-height: 3rem;
  margin: 0;
  color: var(--sk-home-ink-soft);
  font-size: 0.9rem;
  line-height: 1.6;
}

.sk-category-card__link {
  margin-top: var(--sk-home-space-3);
  color: var(--sk-home-primary);
  font-size: 0.82rem;
  font-weight: 800;
}

.sk-home-why {
  background: var(--sk-home-ink);
  color: var(--sk-home-surface);
}

.sk-home-why__layout {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
  gap: clamp(3rem, 8vw, 7rem);
}

.sk-home-why__intro {
  position: sticky;
  top: 8rem;
  align-self: start;
}

.sk-home-why h2,
.sk-home-why__intro > p:last-child {
  color: var(--sk-home-surface);
}

.sk-home-why__intro > p:last-child {
  margin-top: var(--sk-home-space-3);
  opacity: 0.72;
  line-height: 1.75;
}

.sk-reason-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.sk-reason-list li {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: var(--sk-home-space-3);
  padding-block: var(--sk-home-space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.sk-reason-list li:last-child { border-bottom: 1px solid rgba(255, 255, 255, 0.16); }
.sk-reason-list > li > span { color: var(--sk-home-accent); font-size: 0.7rem; font-weight: 800; letter-spacing: 0.12em; }
.sk-reason-list h3 { margin: 0; color: var(--sk-home-surface); font-size: 1.25rem; }
.sk-reason-list p { margin: 0.55rem 0 0; color: rgba(255, 255, 255, 0.67); line-height: 1.65; }

.sk-featured-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--sk-home-space-4);
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.sk-featured-heading > a {
  flex: 0 0 auto;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--sk-home-primary);
  color: var(--sk-home-primary);
  font-size: 0.86rem;
  font-weight: 800;
  text-decoration: none;
}

.sk-products-empty {
  display: grid;
  grid-template-columns: 7rem 1fr;
  align-items: center;
  gap: var(--sk-home-space-4);
  min-height: 210px;
  padding: clamp(2rem, 5vw, 4rem);
  border: 1px dashed var(--sk-home-primary);
  border-radius: var(--sk-home-radius-lg);
  background: var(--sk-home-surface-muted);
}

.sk-products-empty > span { color: var(--sk-home-primary); font-size: 0.75rem; font-weight: 850; letter-spacing: 0.12em; }
.sk-products-empty h3 { margin: 0; color: var(--sk-home-ink); font-size: 1.5rem; }
.sk-products-empty p { margin: 0.65rem 0 0; color: var(--sk-home-ink-soft); line-height: 1.65; }

.sk-home-subjects { background: var(--sk-home-surface); }

.sk-subject-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  border-top: 1px solid var(--sk-home-line);
  border-left: 1px solid var(--sk-home-line);
}

.sk-subject-grid a {
  position: relative;
  min-height: 180px;
  padding: var(--sk-home-space-3);
  border-right: 1px solid var(--sk-home-line);
  border-bottom: 1px solid var(--sk-home-line);
  background: var(--sk-home-surface);
  color: var(--sk-home-ink);
  text-decoration: none;
  transition: background-color var(--sk-home-motion), color var(--sk-home-motion);
}

.sk-subject-grid a:hover { background: var(--sk-home-ink); color: var(--sk-home-surface); }
.sk-subject-grid span { color: var(--sk-home-primary); font-size: 0.67rem; font-weight: 850; letter-spacing: 0.12em; }
.sk-subject-grid h3 { margin: 4rem 0 0; color: inherit; font-size: 1.05rem; }
.sk-subject-grid i { position: absolute; right: var(--sk-home-space-3); bottom: var(--sk-home-space-3); font-style: normal; }

.sk-home-schools { background: var(--sk-home-surface); }

.sk-home-split-card {
  display: grid;
  grid-template-columns: minmax(320px, 0.8fr) minmax(0, 1.2fr);
  overflow: hidden;
  border-radius: var(--sk-home-radius-lg);
  background: var(--sk-home-ink);
  box-shadow: var(--sk-home-shadow);
}

.sk-home-split-card__visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  min-height: 510px;
  padding: 1px;
  background: rgba(255, 255, 255, 0.14);
}

.sk-school-cell {
  display: grid;
  place-items: center;
  background: var(--sk-home-primary);
  color: var(--sk-home-surface);
  font-size: clamp(1rem, 2.5vw, 1.7rem);
  font-weight: 850;
  letter-spacing: 0.1em;
}

.sk-school-cell:nth-child(2) { background: var(--sk-home-accent); color: var(--sk-home-ink); }
.sk-school-cell:nth-child(3) { background: var(--sk-home-lime); color: var(--sk-home-ink); }
.sk-school-cell:nth-child(4) { background: var(--sk-home-sun); color: var(--sk-home-ink); }

.sk-home-split-card__content {
  align-self: center;
  padding: clamp(2.5rem, 6vw, 5rem);
}

.sk-home-split-card h2 { color: var(--sk-home-surface); }
.sk-home-split-card__content > p:not(.sk-section-eyebrow) { margin: var(--sk-home-space-3) 0; color: rgba(255, 255, 255, 0.7); line-height: 1.7; }
.sk-home-split-card ul { margin: 0 0 var(--sk-home-space-4); padding: 0; color: var(--sk-home-surface); list-style: none; }
.sk-home-split-card li { padding: 0.55rem 0; border-bottom: 1px solid rgba(255, 255, 255, 0.12); }
.sk-home-split-card li::before { margin-right: 0.7rem; color: var(--sk-home-accent); content: "+"; }

.sk-home-subscription { background: var(--sk-home-surface-muted); }

.sk-subscription-card {
  display: grid;
  grid-template-columns: 0.45fr 1.2fr auto;
  align-items: center;
  gap: clamp(2rem, 5vw, 5rem);
  padding: clamp(2rem, 5vw, 4.5rem);
  border: 1px solid var(--sk-home-line);
  border-radius: var(--sk-home-radius-lg);
  background:
    radial-gradient(circle at 10% 20%, rgba(38, 198, 218, 0.18), transparent 12rem),
    var(--sk-home-surface);
}

.sk-subscription-card__label {
  display: grid;
  min-height: 180px;
  align-content: space-between;
  padding: var(--sk-home-space-3);
  border: 1px dashed var(--sk-home-primary);
  border-radius: var(--sk-home-radius-md);
  color: var(--sk-home-primary);
}

.sk-subscription-card__label span { font-size: 0.72rem; font-weight: 850; letter-spacing: 0.1em; text-transform: uppercase; }
.sk-subscription-card__label strong { font-size: 1.15rem; }
.sk-subscription-card__copy p:last-child { margin: var(--sk-home-space-3) 0 0; color: var(--sk-home-ink-soft); line-height: 1.7; }

.sk-home-learning { background: var(--sk-home-surface); }

.sk-home-learning-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sk-home-space-2);
}

.sk-home-learning-grid a {
  min-height: 240px;
  padding: var(--sk-home-space-4);
  border: 1px solid var(--sk-home-line);
  border-radius: var(--sk-home-radius-md);
  background: var(--sk-home-background);
  color: var(--sk-home-ink);
  text-decoration: none;
  transition: background-color var(--sk-home-motion), border-color var(--sk-home-motion), transform var(--sk-home-motion);
}

.sk-home-learning-grid a:hover { border-color: var(--sk-home-primary); background: var(--sk-home-surface); color: var(--sk-home-ink); transform: translateY(-4px); }
.sk-home-learning-grid span { color: var(--sk-home-primary); font-size: 0.68rem; font-weight: 850; letter-spacing: 0.12em; }
.sk-home-learning-grid h3 { margin: 4rem 0 0.8rem; color: inherit; font-size: 1.35rem; }
.sk-home-learning-grid p { margin: 0; color: var(--sk-home-ink-soft); font-size: 0.92rem; line-height: 1.65; }

@media (max-width: 1024px) {
  .sk-home-hero__grid { grid-template-columns: 1fr 400px; gap: 2rem; }
  .sk-home-hero__visual { min-height: 400px; }
  .sk-category-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sk-subject-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sk-home-split-card { grid-template-columns: 0.8fr 1.2fr; }
  .sk-subscription-card { grid-template-columns: 0.55fr 1.45fr; }
  .sk-subscription-card > .sk-home-button { grid-column: 2; justify-self: start; }
}

@media (max-width: 768px) {
  .sk-home-container { width: min(100% - 2rem, 1180px); }
  .sk-home-section { padding-block: 4.5rem; }
  .sk-home-hero { min-height: auto; padding-top: 4rem; }
  .sk-home-hero__grid { grid-template-columns: 1fr; }
  .sk-home-hero__visual { width: min(100%, 430px); min-height: 430px; margin: 1rem auto 0; }
  .sk-home-why__layout { grid-template-columns: 1fr; gap: 2.5rem; }
  .sk-home-why__intro { position: static; }
  .sk-featured-heading { align-items: start; flex-direction: column; }
  .sk-home-split-card { grid-template-columns: 1fr; }
  .sk-home-split-card__visual { min-height: 320px; }
  .sk-subscription-card { grid-template-columns: 1fr; }
  .sk-subscription-card__label { min-height: 130px; }
  .sk-subscription-card > .sk-home-button { grid-column: auto; }
  .sk-home-learning-grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .sk-home-hero h1 { font-size: clamp(2.65rem, 13vw, 4rem); }
  .sk-home-actions { align-items: stretch; flex-direction: column; }
  .sk-home-button { width: 100%; }
  .sk-home-trust-list { gap: 0.65rem 1rem; }
  .sk-home-hero__visual { min-height: 330px; }
  .sk-hero-note--two { right: 0; }
  .sk-category-grid { grid-template-columns: 1fr; }
  .sk-category-card { min-height: 280px; }
  .sk-reason-list li { grid-template-columns: 2.5rem 1fr; }
  .sk-products-empty { grid-template-columns: 1fr; gap: 1rem; }
  .sk-subject-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sk-subject-grid a { min-height: 155px; }
  .sk-school-cell { font-size: 0.82rem; }
}

@media (prefers-reduced-motion: reduce) {
  .sk-home-main *,
  .sk-home-main *::before,
  .sk-home-main *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

.sk-home-settings {
  background: var(--sk-home-surface-muted);
}

.sk-learning-settings-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sk-home-space-2);
}

.sk-learning-settings-grid article {
  padding: var(--sk-home-space-4);
  border: 1px solid var(--sk-home-line);
  border-radius: var(--sk-home-radius-md);
  background: var(--sk-home-surface);
}

.sk-learning-settings-grid span {
  color: var(--sk-home-primary);
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.12em;
}

.sk-learning-settings-grid h3 {
  margin: var(--sk-home-space-4) 0 var(--sk-home-space-2);
  color: var(--sk-home-ink);
  font-size: 1.4rem;
}

.sk-learning-settings-grid p {
  margin: 0;
  color: var(--sk-home-ink-soft);
  line-height: 1.7;
}

.sk-home-final-cta {
  padding-top: 0;
  background: var(--sk-home-surface);
}

.sk-home-final-cta__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sk-home-space-6);
  padding: clamp(2.5rem, 6vw, 5rem);
  border-radius: var(--sk-home-radius-lg);
  background: var(--sk-home-primary);
  color: var(--sk-home-surface);
}

.sk-home-final-cta h2 {
  max-width: 48rem;
  margin: 0;
  color: var(--sk-home-surface);
}

.sk-home-final-cta .sk-section-eyebrow {
  color: var(--sk-home-accent);
}

.sk-home-final-cta .sk-home-actions {
  flex: 0 0 auto;
  margin: 0;
}

@media (max-width: 768px) {
  .sk-learning-settings-grid {
    grid-template-columns: 1fr;
  }

  .sk-home-final-cta__inner {
    align-items: flex-start;
    flex-direction: column;
  }
}