/* =========================================================
   LEARN SOCRATIAN — GLOBAL DESIGN SYSTEM
   ========================================================= */

:root {
  color-scheme: light;

  --color-primary-50: #f7f5fb;
  --color-primary-100: #eee9f7;
  --color-primary-200: #ded5ef;
  --color-primary-300: #c7b8e3;
  --color-primary-400: #ad95d3;
  --color-primary-500: #9174bf;
  --color-primary-600: #765ba8;
  --color-primary-700: #60478b;
  --color-primary-800: #503d71;
  --color-primary-900: #44355e;

  --color-secondary-50: #f4f8f7;
  --color-secondary-100: #e5efec;
  --color-secondary-500: #5f8f83;
  --color-secondary-600: #4f786f;
  --color-secondary-700: #42635c;

  --color-accent-gold: #c79a4a;
  --color-accent-gold-soft: #f5ead5;
  --color-accent-rose: #a96876;
  --color-accent-rose-soft: #f5e9ec;

  --color-white: #ffffff;
  --color-neutral-25: #fdfcfe;
  --color-neutral-50: #faf9fc;
  --color-neutral-100: #f3f1f6;
  --color-neutral-200: #e7e3eb;
  --color-neutral-300: #d4ceda;
  --color-neutral-500: #77707e;
  --color-neutral-600: #625b69;
  --color-neutral-700: #4a4450;
  --color-neutral-800: #312d36;
  --color-neutral-900: #211e25;

  --color-text: var(--color-neutral-800);
  --color-text-muted: var(--color-neutral-600);
  --color-heading: #28222f;
  --color-border: rgba(80, 61, 113, 0.14);
  --color-focus: #5b43a0;
  --color-page: var(--color-white);

  --font-heading: "Libre Baskerville", Georgia, "Times New Roman", serif;
  --font-body: "DM Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: clamp(1.45rem, 2vw, 1.75rem);
  --font-size-2xl: clamp(1.9rem, 3.2vw, 2.75rem);
  --font-size-3xl: clamp(2.55rem, 5.2vw, 4.75rem);

  --line-height-tight: 1.15;
  --line-height-heading: 1.25;
  --line-height-body: 1.7;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-28: 7rem;

  --radius-sm: 0.5rem;
  --radius-md: 0.875rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.75rem;
  --radius-pill: 999px;

  --shadow-sm: 0 4px 14px rgba(53, 42, 70, 0.06);
  --shadow-md: 0 14px 40px rgba(53, 42, 70, 0.1);
  --shadow-lg: 0 24px 70px rgba(53, 42, 70, 0.14);

  --container-width: 75rem;
  --container-gutter: clamp(1.25rem, 4vw, 2.5rem);
  --header-height: 5.5rem;

  --transition-fast: 150ms ease;
  --transition-base: 240ms ease;
  --transition-slow: 420ms cubic-bezier(0.22, 1, 0.36, 1);

  --z-header: 100;
  --z-menu: 110;
  --z-skip-link: 1000;
}

/* =========================================================
   RESET AND BASE
   ========================================================= */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-4));
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-width: 20rem;
  background: var(--color-page);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height-body);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

img,
picture,
svg {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

button,
input,
textarea,
select {
  color: inherit;
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  border: 0;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

p,
h1,
h2,
h3,
ul {
  margin-top: 0;
}

h1,
h2,
h3 {
  color: var(--color-heading);
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: var(--line-height-heading);
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 4px;
}

::selection {
  background: var(--color-primary-200);
  color: var(--color-primary-900);
}

/* =========================================================
   ACCESSIBILITY AND UTILITIES
   ========================================================= */

.container {
  width: min(100% - (2 * var(--container-gutter)), var(--container-width));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.skip-link {
  position: fixed;
  top: var(--space-4);
  left: var(--space-4);
  z-index: var(--z-skip-link);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  background: var(--color-primary-800);
  color: var(--color-white);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(calc(-100% - var(--space-8)));
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  transform: translateY(0);
}

.section {
  padding-block: var(--space-24);
}

.section--tinted {
  background: linear-gradient(180deg, var(--color-primary-50), var(--color-neutral-25));
}

.features,
.featured-courses {
  scroll-margin-top: calc(var(--header-height) + var(--space-4));
}

.section-heading {
  margin-bottom: var(--space-12);
}

.section-heading--centered {
  max-width: 48rem;
  margin-inline: auto;
  text-align: center;
}

.section-heading--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.7fr);
  gap: var(--space-10);
  align-items: end;
}

.section-heading__eyebrow,
.hero__eyebrow,
.course-menu__eyebrow,
.closing-cta__eyebrow {
  margin-bottom: var(--space-3);
  color: var(--color-primary-700);
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1.4;
  text-transform: uppercase;
}

.section-heading__title {
  margin-bottom: var(--space-4);
  font-size: var(--font-size-2xl);
}

.section-heading__description {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-md);
}

/* =========================================================
   BUTTONS
   ========================================================= */

.button {
  display: inline-flex;
  min-height: 2.875rem;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.7rem 1.25rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition:
    color var(--transition-base),
    background-color var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-base);
}

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

.button:active {
  transform: translateY(0);
}

.button--primary {
  background: var(--color-primary-700);
  color: var(--color-white);
  box-shadow: 0 8px 22px rgba(96, 71, 139, 0.22);
}

.button--primary:hover {
  background: var(--color-primary-800);
  box-shadow: 0 12px 30px rgba(80, 61, 113, 0.28);
}

.button--secondary {
  border-color: var(--color-primary-300);
  background: rgba(255, 255, 255, 0.78);
  color: var(--color-primary-800);
}

.button--secondary:hover {
  border-color: var(--color-primary-500);
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.button--text {
  padding-inline: var(--space-3);
  color: var(--color-primary-800);
}

.button--text:hover {
  background: var(--color-primary-50);
}

.button--small {
  min-height: 2.5rem;
  padding: 0.6rem 1rem;
}

.button--large {
  min-height: 3.35rem;
  padding: 0.9rem 1.55rem;
  font-size: var(--font-size-base);
}

/* =========================================================
   SITE HEADER AND NAVIGATION
   ========================================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  border-bottom: 1px solid transparent;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 8px 30px rgba(53, 42, 70, 0.07);
}

.site-header__container {
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-header__brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.site-header__logo {
  width: clamp(11rem, 16vw, 13.75rem);
  height: auto;
  object-fit: contain;
}

.site-header__navigation {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-4), 2vw, var(--space-8));
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(0.15rem, 0.55vw, var(--space-2));
  padding: 0;
  margin: 0;
  list-style: none;
}

.site-nav__item {
  position: relative;
}

.site-nav__link-group {
  display: flex;
  align-items: center;
}

.site-nav__link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  padding: var(--space-2) clamp(0.4rem, 0.7vw, var(--space-3));
  border-radius: var(--radius-pill);
  color: var(--color-neutral-700);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.site-nav__link:hover,
.site-nav__link--active {
  background: var(--color-primary-50);
  color: var(--color-primary-800);
}

.site-nav__link--active {
  box-shadow: inset 0 -2px 0 var(--color-primary-500);
}

.site-nav__submenu-toggle {
  display: inline-grid;
  width: 2rem;
  height: 2rem;
  margin-left: -0.45rem;
  place-items: center;
  border-radius: 50%;
  background: transparent;
  color: var(--color-neutral-600);
  cursor: pointer;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-base);
}

.site-nav__submenu-toggle:hover {
  background: var(--color-primary-100);
  color: var(--color-primary-800);
}

.site-nav__submenu-toggle[aria-expanded="true"] {
  transform: rotate(180deg);
}

.site-header__account-actions {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: var(--space-1);
}

.site-header__menu-button {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-primary-800);
  cursor: pointer;
  font-weight: 700;
}

.site-header__menu-icon {
  display: flex;
  width: 1.25rem;
  height: 1rem;
  flex-direction: column;
  justify-content: space-between;
}

.site-header__menu-icon span {
  width: 100%;
  height: 2px;
  border-radius: var(--radius-pill);
  background: currentColor;
  transform-origin: center;
  transition:
    transform var(--transition-base),
    opacity var(--transition-base);
}

.site-header__menu-button[aria-expanded="true"] .site-header__menu-icon span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header__menu-button[aria-expanded="true"] .site-header__menu-icon span:nth-child(2) {
  opacity: 0;
}

.site-header__menu-button[aria-expanded="true"] .site-header__menu-icon span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* =========================================================
   COURSES MEGA MENU
   ========================================================= */

.course-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  z-index: var(--z-menu);
  display: grid;
  width: min(40rem, calc(100vw - (2 * var(--container-gutter))));
  grid-template-columns: 0.85fr 1.15fr;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-white);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, calc(-1 * var(--space-2)));
  visibility: hidden;
  transition:
    opacity var(--transition-base),
    transform var(--transition-base),
    visibility var(--transition-base);
}

.site-nav__item--has-menu.is-open .course-menu,
.site-nav__item--has-menu:focus-within .course-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
  visibility: visible;
}

.course-menu__intro {
  padding: var(--space-8);
  background:
    radial-gradient(circle at 15% 20%, rgba(255, 255, 255, 0.9), transparent 35%),
    linear-gradient(145deg, var(--color-primary-100), var(--color-primary-50));
}

.course-menu__title {
  margin-bottom: var(--space-5);
  color: var(--color-heading);
  font-family: var(--font-heading);
  font-size: var(--font-size-lg);
  font-weight: 700;
  line-height: 1.45;
}

.course-menu__all-link {
  color: var(--color-primary-800);
  font-size: var(--font-size-sm);
  font-weight: 700;
}

.course-menu__list {
  display: grid;
  align-content: center;
  gap: var(--space-2);
  padding: var(--space-5);
  margin: 0;
  list-style: none;
}

.course-menu__item {
  min-width: 0;
}

.course-menu__link {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition:
    background-color var(--transition-fast),
    transform var(--transition-base);
}

.course-menu__link:hover {
  background: var(--color-primary-50);
  transform: translateX(var(--space-1));
}

.course-menu__icon {
  display: grid;
  width: 2.75rem;
  height: 2.75rem;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--color-primary-100);
  color: var(--color-primary-700);
}

.course-menu__name,
.course-menu__description {
  display: block;
}

.course-menu__name {
  color: var(--color-heading);
  font-weight: 700;
}

.course-menu__description {
  margin-top: 0.15rem;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  line-height: 1.45;
}

/* =========================================================
   HERO
   ========================================================= */

.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 8% 18%, rgba(222, 213, 239, 0.62), transparent 26rem),
    radial-gradient(circle at 94% 85%, rgba(229, 239, 236, 0.72), transparent 24rem),
    var(--color-neutral-25);
}

.hero::before {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(96, 71, 139, 0.13) 0.75px, transparent 0.75px);
  background-size: 24px 24px;
  content: "";
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.55), transparent 78%);
  pointer-events: none;
}

.hero__container {
  position: relative;
  display: grid;
  min-height: calc(100svh - var(--header-height));
  grid-template-columns: minmax(0, 1fr) minmax(23rem, 0.92fr);
  gap: clamp(var(--space-10), 7vw, var(--space-24));
  align-items: center;
  padding-block: var(--space-16);
}

.hero__visual {
  position: relative;
  display: grid;
  min-width: 0;
  place-items: center;
}

.hero__image-frame {
  position: relative;
  z-index: 2;
  width: min(100%, 34rem);
  overflow: hidden;
  border: 1px solid rgba(96, 71, 139, 0.12);
  border-radius: 44% 44% var(--radius-xl) var(--radius-xl);
  background: linear-gradient(155deg, rgba(255, 255, 255, 0.85), rgba(238, 233, 247, 0.72));
  box-shadow: var(--shadow-lg);
}

.hero__image-frame::after {
  position: absolute;
  inset: 0;
  border: 0.5rem solid rgba(255, 255, 255, 0.32);
  border-radius: inherit;
  content: "";
  pointer-events: none;
}

.hero__image {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
}

.hero__accent {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.hero__accent--one {
  top: 7%;
  right: 2%;
  width: 5.5rem;
  height: 5.5rem;
  border: 1px solid var(--color-primary-300);
  background: rgba(255, 255, 255, 0.58);
}

.hero__accent--two {
  bottom: 3%;
  left: 0;
  width: 3.5rem;
  height: 3.5rem;
  background: var(--color-accent-gold-soft);
  opacity: 0.85;
}

.hero__content {
  position: relative;
  z-index: 3;
  max-width: 38rem;
}

.hero__title {
  margin-bottom: var(--space-6);
  font-size: var(--font-size-3xl);
  letter-spacing: -0.045em;
  line-height: var(--line-height-tight);
}

.hero__description {
  max-width: 35rem;
  margin-bottom: var(--space-8);
  color: var(--color-text-muted);
  font-size: clamp(1.05rem, 1.5vw, 1.22rem);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.hero__highlights {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
  padding: 0;
  margin: 0;
  color: var(--color-neutral-700);
  font-size: var(--font-size-sm);
  font-weight: 600;
  list-style: none;
}

.hero__highlight {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.hero__highlight svg {
  color: var(--color-secondary-600);
}

/* =========================================================
   FEATURE CARDS
   ========================================================= */

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

.feature-card {
  position: relative;
  padding: var(--space-8);
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-slow);
}

.feature-card::after {
  position: absolute;
  top: 0;
  right: 0;
  width: 6rem;
  height: 6rem;
  border-radius: 0 0 0 100%;
  background: linear-gradient(225deg, var(--color-primary-100), transparent 72%);
  content: "";
  opacity: 0.7;
}

.feature-card:hover {
  border-color: var(--color-primary-200);
  box-shadow: var(--shadow-md);
  transform: translateY(-0.4rem);
}

.feature-card__icon {
  display: grid;
  width: 4rem;
  height: 4rem;
  margin-bottom: var(--space-6);
  place-items: center;
  border-radius: var(--radius-md);
  background: var(--color-primary-100);
  color: var(--color-primary-700);
}

.feature-card:nth-child(2) .feature-card__icon {
  background: var(--color-secondary-100);
  color: var(--color-secondary-700);
}

.feature-card:nth-child(3) .feature-card__icon {
  background: var(--color-accent-gold-soft);
  color: #8a682d;
}

.feature-card__title {
  margin-bottom: var(--space-3);
  font-size: var(--font-size-xl);
}

.feature-card__description {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

/* =========================================================
   FEATURED COURSE CARDS
   ========================================================= */

.featured-courses__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-8);
}

.course-card {
  display: grid;
  min-width: 0;
  grid-template-columns: minmax(12rem, 0.85fr) minmax(16rem, 1.15fr);
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
  transition:
    box-shadow var(--transition-base),
    transform var(--transition-slow);
}

.course-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-0.35rem);
}

.course-card__visual {
  position: relative;
  display: grid;
  min-height: 100%;
  place-items: center;
  overflow: hidden;
}

.course-card__visual::before,
.course-card__visual::after {
  position: absolute;
  border-radius: 50%;
  content: "";
}

.course-card__visual::before {
  top: -2rem;
  left: -2rem;
  width: 8rem;
  height: 8rem;
  border: 1px solid currentColor;
  opacity: 0.14;
}

.course-card__visual::after {
  right: -1.5rem;
  bottom: -1.5rem;
  width: 6rem;
  height: 6rem;
  background: currentColor;
  opacity: 0.08;
}

.course-card--mathematics .course-card__visual {
  background: linear-gradient(145deg, var(--color-primary-100), #f7f2fc);
  color: var(--color-primary-600);
}

.course-card--french .course-card__visual {
  background: linear-gradient(145deg, var(--color-accent-rose-soft), #fcf6f7);
  color: var(--color-accent-rose);
}

/* FUTURE COURSE: Visual foundations are ready for launch-time enablement. */
.course-card--science .course-card__visual {
  background: linear-gradient(145deg, var(--color-secondary-100), #f4faf8);
  color: var(--color-secondary-700);
}

.course-card--computer-studies .course-card__visual {
  background: linear-gradient(145deg, #e8edf7, #f6f8fc);
  color: #536a96;
}

.course-card__illustration {
  position: relative;
  z-index: 1;
  width: 88%;
  max-width: 17rem;
  height: auto;
}

.course-card__content {
  padding: clamp(var(--space-6), 3vw, var(--space-10));
}

.course-card__label {
  margin-bottom: var(--space-2);
  color: var(--color-primary-700);
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.course-card__title {
  margin-bottom: var(--space-3);
  font-size: var(--font-size-xl);
}

.course-card__description {
  margin-bottom: var(--space-5);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.course-card__topics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: 0;
  margin-bottom: var(--space-6);
  list-style: none;
}

.course-card__topics li {
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--color-primary-200);
  border-radius: var(--radius-pill);
  background: var(--color-primary-50);
  color: var(--color-primary-800);
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1.3;
}

.course-card--french .course-card__topics li {
  border-color: #ead1d7;
  background: var(--color-accent-rose-soft);
  color: #70414b;
}

.course-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary-800);
  font-weight: 700;
  text-decoration: none;
}

.course-card__link svg {
  transition: transform var(--transition-base);
}

.course-card__link:hover {
  text-decoration: underline;
}

.course-card__link:hover svg {
  transform: translateX(var(--space-1));
}

.featured-courses__action {
  display: flex;
  justify-content: center;
  margin-top: var(--space-10);
}

/* =========================================================
   CLOSING CALL TO ACTION
   ========================================================= */

.closing-cta {
  background: var(--color-white);
}

.closing-cta__container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-10);
  padding: clamp(var(--space-8), 5vw, var(--space-16));
  overflow: hidden;
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 92% 12%, rgba(199, 184, 227, 0.24), transparent 15rem),
    var(--color-primary-900);
  box-shadow: var(--shadow-lg);
}

.closing-cta__container::after {
  position: absolute;
  right: 8%;
  bottom: -7rem;
  width: 17rem;
  height: 17rem;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 50%;
  content: "";
}

.closing-cta__content {
  position: relative;
  z-index: 1;
  max-width: 45rem;
}

.closing-cta__eyebrow {
  color: var(--color-primary-200);
}

.closing-cta__title {
  margin-bottom: var(--space-4);
  color: var(--color-white);
  font-size: var(--font-size-2xl);
}

.closing-cta__description {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.76);
  font-size: var(--font-size-md);
}

.closing-cta .button {
  position: relative;
  z-index: 1;
  flex: 0 0 auto;
  background: var(--color-white);
  color: var(--color-primary-900);
  box-shadow: none;
}

.closing-cta .button:hover {
  background: var(--color-primary-100);
}

/* =========================================================
   SITE FOOTER
   ========================================================= */

.site-footer {
  padding-top: var(--space-20);
  background: var(--color-neutral-900);
  color: rgba(255, 255, 255, 0.72);
}

.site-footer__primary {
  display: grid;
  grid-template-columns: minmax(16rem, 0.8fr) minmax(28rem, 1.2fr);
  gap: var(--space-16);
  padding-bottom: var(--space-16);
}

.site-footer__container,
.site-footer__brand,
.site-footer__group {
  min-width: 0;
}

.site-footer__brand-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-white);
  text-decoration: none;
}

.site-footer__logo {
  width: min(100%, 13.75rem);
  height: auto;
  object-fit: contain;
}

.site-footer__tagline {
  max-width: 21rem;
  margin: var(--space-4) 0 0;
  font-size: var(--font-size-sm);
}

.site-footer__navigation {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-8);
}

.site-footer__heading {
  margin-bottom: var(--space-4);
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.site-footer__links,
.site-footer__legal {
  padding: 0;
  margin: 0;
  list-style: none;
}

.site-footer__links {
  display: grid;
  gap: var(--space-2);
}

.site-footer__links a,
.site-footer__legal a {
  color: rgba(255, 255, 255, 0.68);
  font-size: var(--font-size-sm);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-footer__links a:hover,
.site-footer__legal a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

.site-footer__secondary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.11);
}

.site-footer__copyright {
  margin: 0;
  font-size: var(--font-size-xs);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
}

.site-footer__legal a {
  font-size: var(--font-size-xs);
}

.noscript-message {
  position: fixed;
  right: var(--space-4);
  bottom: var(--space-4);
  z-index: var(--z-header);
  max-width: 28rem;
  padding: var(--space-4);
  border: 1px solid var(--color-primary-300);
  border-radius: var(--radius-sm);
  background: var(--color-primary-50);
  color: var(--color-primary-900);
  box-shadow: var(--shadow-md);
  font-size: var(--font-size-sm);
}

/* =========================================================
   RESPONSIVE — COMPACT DESKTOP AND TABLET
   ========================================================= */

@media (max-width: 74.99rem) {
  :root {
    --header-height: 5rem;
  }

  .site-header__navigation {
    gap: var(--space-2);
  }

  .site-nav__link {
    padding-inline: 0.42rem;
  }

  .featured-courses__grid {
    gap: var(--space-6);
  }

  .course-card {
    grid-template-columns: 1fr;
  }

  .course-card__visual {
    min-height: 13rem;
  }
}

@media (max-width: 61.99rem) {
  :root {
    --space-24: 5rem;
  }

  .site-header__menu-button {
    display: inline-flex;
  }

  .site-header__navigation {
    position: fixed;
    top: var(--header-height);
    right: 0;
    bottom: 0;
    width: min(27rem, 100%);
    align-items: stretch;
    flex-direction: column;
    gap: var(--space-6);
    padding: var(--space-6) var(--container-gutter) var(--space-8);
    overflow-y: auto;
    border-top: 1px solid var(--color-border);
    background: var(--color-white);
    box-shadow: -12px 22px 45px rgba(53, 42, 70, 0.14);
    opacity: 0;
    pointer-events: none;
    transform: translateX(100%);
    visibility: hidden;
    transition:
      opacity var(--transition-base),
      transform var(--transition-slow),
      visibility var(--transition-base);
  }

  .site-header__navigation.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(0);
    visibility: visible;
  }

  .site-nav {
    align-items: stretch;
    flex-direction: column;
    gap: var(--space-1);
  }

  .site-nav__link-group {
    justify-content: space-between;
  }

  .site-nav__link {
    min-height: 3rem;
    flex: 1 1 auto;
    justify-content: flex-start;
    padding-inline: var(--space-3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
  }

  .site-nav__link--active {
    box-shadow: inset 3px 0 0 var(--color-primary-500);
  }

  .site-nav__submenu-toggle {
    width: 2.75rem;
    height: 2.75rem;
    margin-left: 0;
  }

  .course-menu {
    position: static;
    display: none;
    width: auto;
    grid-template-columns: 1fr;
    margin: var(--space-2) 0 var(--space-3);
    border-radius: var(--radius-md);
    box-shadow: none;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    visibility: visible;
  }

  .site-nav__item--has-menu.is-open .course-menu,
  .site-nav__item--has-menu:focus-within .course-menu {
    display: grid;
    transform: none;
  }

  .course-menu__intro {
    padding: var(--space-5);
  }

  .course-menu__title {
    font-size: var(--font-size-md);
  }

  .course-menu__list {
    padding: var(--space-3);
  }

  .site-header__account-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
    margin-top: auto;
    padding-top: var(--space-5);
    border-top: 1px solid var(--color-border);
  }

  .site-header__account-actions .button--text {
    border: 1px solid var(--color-primary-200);
  }

  .hero__container {
    min-height: auto;
    grid-template-columns: minmax(0, 0.9fr) minmax(21rem, 1.1fr);
    gap: var(--space-10);
    padding-block: var(--space-16);
  }

  .hero__title {
    font-size: clamp(2.35rem, 5.8vw, 3.8rem);
  }

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

  .feature-card:last-child {
    grid-column: 1 / -1;
    max-width: calc(50% - (var(--space-6) / 2));
    justify-self: center;
  }

  .site-footer__primary {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
}

/* =========================================================
   RESPONSIVE — MOBILE
   ========================================================= */

@media (max-width: 47.99rem) {
  :root {
    --space-20: 4rem;
    --space-24: 4.5rem;
    --container-gutter: 1.25rem;
  }

  .section-heading--split {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .site-header__logo {
    width: 11rem;
  }

  .site-header__menu-label {
    display: none;
  }

  .hero__container {
    grid-template-columns: 1fr;
    gap: var(--space-10);
    padding-block: var(--space-10) var(--space-16);
  }

  .hero__visual {
    order: 0;
  }

  .hero__image-frame {
    width: min(82vw, 25rem);
  }

  .hero__content {
    order: 1;
    max-width: none;
    text-align: center;
  }

  .hero__description {
    margin-inline: auto;
  }

  .hero__actions,
  .hero__highlights {
    justify-content: center;
  }

  .features__grid,
  .featured-courses__grid {
    grid-template-columns: 1fr;
  }

  .feature-card:last-child {
    grid-column: auto;
    max-width: none;
  }

  .course-card__visual {
    min-height: 12rem;
  }

  .closing-cta__container {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-footer__navigation {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: var(--space-10);
  }

  .site-footer__secondary {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 31.99rem) {
  .hero__actions {
    align-items: stretch;
    flex-direction: column;
  }

  .hero__actions .button {
    width: 100%;
  }

  .hero__highlights {
    align-items: flex-start;
    flex-direction: column;
    width: max-content;
    max-width: 100%;
    margin-inline: auto;
  }

  .feature-card,
  .course-card__content {
    padding: var(--space-6);
  }

  .course-card__visual {
    min-height: 10rem;
  }

  .site-footer__navigation {
    grid-template-columns: 1fr;
  }
}

/* =========================================================
   MOTION AND INPUT PREFERENCES
   ========================================================= */

@media (hover: hover) and (min-width: 62rem) {
  .site-nav__item--has-menu:hover .course-menu {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, 0);
    visibility: visible;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (forced-colors: active) {
  .button,
  .feature-card,
  .course-card,
  .course-menu {
    border: 1px solid ButtonText;
  }

  .hero__image-frame {
    border: 1px solid CanvasText;
  }
}

/* =========================================================
   PRINT
   ========================================================= */

@media print {
  .site-header,
  .hero__actions,
  .closing-cta,
  .site-footer,
  .noscript-message {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .hero,
  .section--tinted {
    background: #fff;
  }

  .hero__container {
    min-height: auto;
  }

  .feature-card,
  .course-card {
    break-inside: avoid;
    box-shadow: none;
  }
}
/* =========================================================
   MATHEMATICS LANDING PAGE
   courses/mathematics/index.html
   ========================================================= */

/* ---------------------------------------------------------
   MATHEMATICS HERO
   --------------------------------------------------------- */

.mathematics-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
  background:
    radial-gradient(circle at 92% 14%, rgba(222, 213, 239, 0.5), transparent 28rem),
    linear-gradient(180deg, var(--color-white), var(--color-neutral-25));
}

.mathematics-hero__container {
  display: grid;
  min-height: clamp(38rem, 72vh, 52rem);
  grid-template-columns: minmax(0, 1.08fr) minmax(25rem, 0.92fr);
  align-items: stretch;
}

.mathematics-hero__visual {
  position: relative;
  min-width: 0;
  overflow: hidden;
  background: var(--color-primary-50);
}

.mathematics-hero__visual::after {
  position: absolute;
  top: 0;
  right: -1px;
  width: clamp(4rem, 8vw, 8rem);
  height: 100%;
  background: linear-gradient(to right, transparent, var(--color-neutral-25));
  content: "";
  pointer-events: none;
}

.mathematics-hero__image {
  width: 100%;
  height: 100%;
  min-height: 38rem;
  object-fit: cover;
  object-position: center;
}

.mathematics-hero__content {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  padding: clamp(var(--space-10), 5vw, var(--space-20));
}

.mathematics-hero__eyebrow {
  margin-bottom: var(--space-3);
  color: var(--color-primary-700);
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.mathematics-hero__title {
  margin-bottom: var(--space-4);
  color: var(--color-primary-900);
  font-family: var(--font-heading);
  font-size: clamp(3.2rem, 6vw, 5.8rem);
  letter-spacing: -0.045em;
  line-height: 1;
}

.mathematics-hero__ornament {
  display: grid;
  width: min(100%, 24rem);
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-3);
  align-items: center;
  margin-bottom: var(--space-6);
  color: var(--color-accent-gold);
}

.mathematics-hero__ornament span:first-child,
.mathematics-hero__ornament span:last-child {
  height: 1px;
  background: currentColor;
  opacity: 0.55;
}

.mathematics-hero__ornament span:nth-child(2) {
  font-size: 1.1rem;
  line-height: 1;
}

.mathematics-hero__description {
  max-width: 40rem;
  margin-bottom: var(--space-10);
  color: var(--color-text-muted);
  font-size: clamp(1rem, 1.4vw, 1.18rem);
}

.mathematics-hero__pathways {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--color-border);
}

.mathematics-pathway {
  min-width: 0;
  padding-top: var(--space-6);
}

.mathematics-pathway + .mathematics-pathway {
  padding-left: var(--space-8);
  margin-left: var(--space-8);
  border-left: 1px solid var(--color-border);
}

.mathematics-pathway__heading {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.mathematics-pathway__icon {
  display: grid;
  width: 3.5rem;
  height: 3.5rem;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 50%;
  background: var(--color-primary-100);
  color: var(--color-primary-700);
}

.mathematics-pathway__title {
  margin-bottom: 0.1rem;
  color: var(--color-primary-900);
  font-family: var(--font-heading);
  font-size: clamp(1.35rem, 2vw, 1.7rem);
}

.mathematics-pathway__subtitle {
  margin: 0;
  color: #9a742f;
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.mathematics-pathway__description {
  min-height: 5.2rem;
  margin-bottom: var(--space-5);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.mathematics-pathway .button {
  min-width: 10.75rem;
}


/* ---------------------------------------------------------
   MATHEMATICS DIRECTORY PANELS
   --------------------------------------------------------- */

.mathematics-directory {
  background: var(--color-white);
}

.mathematics-directory--topics {
  background:
    linear-gradient(180deg, var(--color-primary-50), var(--color-neutral-25));
}

.mathematics-directory__panel {
  padding: clamp(var(--space-6), 3vw, var(--space-10));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow-sm);
}

.mathematics-directory__heading {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.mathematics-directory__heading .section-heading__eyebrow {
  margin-bottom: var(--space-1);
}

.mathematics-directory__icon {
  display: grid;
  width: 3.75rem;
  height: 3.75rem;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 50%;
  background: var(--color-primary-100);
  color: var(--color-primary-700);
}

.mathematics-directory__title {
  margin: 0;
  color: var(--color-primary-900);
  font-size: clamp(1.55rem, 2.5vw, 2rem);
}

.mathematics-directory__grid {
  display: grid;
  overflow: hidden;
  border: 1px solid var(--color-primary-200);
  border-radius: var(--radius-md);
  background: var(--color-white);
}

.mathematics-directory__grid--grades {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

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

.mathematics-directory__item {
  position: relative;
  display: flex;
  min-width: 0;
  min-height: 8.5rem;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-4);
  color: var(--color-primary-900);
  text-align: center;
  text-decoration: none;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-base);
}

.mathematics-directory__item:not(:last-child) {
  border-right: 1px solid var(--color-primary-200);
}

.mathematics-directory__grid--topics .mathematics-directory__item:nth-child(4n) {
  border-right: 0;
}

.mathematics-directory__grid--topics .mathematics-directory__item:nth-child(n + 5) {
  border-top: 1px solid var(--color-primary-200);
}

.mathematics-directory__item:hover {
  z-index: 1;
  background: var(--color-primary-50);
  color: var(--color-primary-800);
}

.mathematics-directory__item:focus-visible {
  z-index: 2;
}

.mathematics-directory__symbol {
  display: grid;
  min-height: 2rem;
  place-items: center;
  color: var(--color-primary-700);
  font-family: var(--font-heading);
  font-size: clamp(1.35rem, 2vw, 1.75rem);
  font-weight: 700;
  line-height: 1;
}

.mathematics-directory__grid--topics .mathematics-directory__symbol {
  font-size: clamp(1.15rem, 1.7vw, 1.5rem);
}

.mathematics-directory__item > span:last-child {
  display: grid;
  gap: 0.2rem;
  line-height: 1.3;
}

.mathematics-directory__item strong {
  font-size: var(--font-size-sm);
  font-weight: 700;
}

.mathematics-directory__item small {
  color: var(--color-text-muted);
  font-size: 0.7rem;
  line-height: 1.4;
}

.mathematics-directory__grid--grades .mathematics-directory__item {
  min-height: 8rem;
}

.mathematics-directory__grid--grades .mathematics-directory__item > span:last-child {
  font-size: var(--font-size-sm);
  font-weight: 700;
}


/* ---------------------------------------------------------
   MATHEMATICS RESPONSIVE
   --------------------------------------------------------- */

@media (max-width: 74.99rem) {
  .mathematics-hero__container {
    grid-template-columns: minmax(0, 1fr) minmax(23rem, 0.95fr);
  }

  .mathematics-hero__content {
    padding: var(--space-10);
  }

  .mathematics-pathway + .mathematics-pathway {
    padding-left: var(--space-5);
    margin-left: var(--space-5);
  }

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

  .mathematics-directory__grid--grades .mathematics-directory__item:nth-child(3n) {
    border-right: 0;
  }

  .mathematics-directory__grid--grades .mathematics-directory__item:nth-child(n + 4) {
    border-top: 1px solid var(--color-primary-200);
  }

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

  .mathematics-directory__grid--topics .mathematics-directory__item:nth-child(odd) {
    border-right: 1px solid var(--color-primary-200);
  }

  .mathematics-directory__grid--topics .mathematics-directory__item:nth-child(even) {
    border-right: 0;
  }

  .mathematics-directory__grid--topics .mathematics-directory__item:nth-child(n + 3) {
    border-top: 1px solid var(--color-primary-200);
  }
}

@media (max-width: 61.99rem) {
  .mathematics-hero__container {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .mathematics-hero__visual {
    max-height: 34rem;
  }

  .mathematics-hero__visual::after {
    top: auto;
    right: 0;
    bottom: -1px;
    width: 100%;
    height: 6rem;
    background: linear-gradient(to bottom, transparent, var(--color-neutral-25));
  }

  .mathematics-hero__image {
    min-height: 28rem;
    max-height: 34rem;
  }

  .mathematics-hero__content {
    padding: var(--space-10) var(--container-gutter) var(--space-16);
  }

  .mathematics-hero__description {
    max-width: 44rem;
  }
}

@media (max-width: 47.99rem) {
  .mathematics-hero__image {
    min-height: 22rem;
  }

  .mathematics-hero__content {
    text-align: center;
  }

  .mathematics-hero__ornament {
    margin-inline: auto;
  }

  .mathematics-hero__description {
    margin-inline: auto;
  }

  .mathematics-hero__pathways {
    grid-template-columns: 1fr;
  }

  .mathematics-pathway {
    text-align: left;
  }

  .mathematics-pathway + .mathematics-pathway {
    padding-top: var(--space-6);
    padding-left: 0;
    margin-top: var(--space-6);
    margin-left: 0;
    border-top: 1px solid var(--color-border);
    border-left: 0;
  }

  .mathematics-pathway__description {
    min-height: 0;
  }

  .mathematics-directory__heading {
    align-items: flex-start;
  }

  .mathematics-directory__grid--grades,
  .mathematics-directory__grid--topics {
    grid-template-columns: 1fr;
  }

  .mathematics-directory__grid--grades .mathematics-directory__item,
  .mathematics-directory__grid--topics .mathematics-directory__item {
    min-height: 6.75rem;
    border-right: 0 !important;
    border-top: 1px solid var(--color-primary-200);
  }

  .mathematics-directory__grid--grades .mathematics-directory__item:first-child,
  .mathematics-directory__grid--topics .mathematics-directory__item:first-child {
    border-top: 0;
  }
}

@media (max-width: 31.99rem) {
  .mathematics-hero__content {
    padding-top: var(--space-8);
  }

  .mathematics-hero__title {
    font-size: clamp(2.75rem, 16vw, 4rem);
  }

  .mathematics-pathway .button {
    width: 100%;
  }

  .mathematics-directory__panel {
    padding: var(--space-5);
  }
}

@media print {
  .mathematics-hero__visual {
    display: none;
  }

  .mathematics-hero__container {
    display: block;
    min-height: 0;
  }

  .mathematics-hero__content {
    padding: 0;
  }

  .mathematics-directory__panel {
    box-shadow: none;
  }
}

/* =========================================================
   COURSES PAGE — COMPACT DYNAMIC SUBJECT GRID
   ========================================================= */

.subjects-page {
  position: relative;
  padding-block: clamp(3.25rem, 6vw, 5rem);
  overflow: hidden;
  background:
    radial-gradient(circle at 10% 8%, rgba(222, 213, 239, 0.58), transparent 24rem),
    radial-gradient(circle at 92% 88%, rgba(229, 239, 236, 0.46), transparent 22rem),
    linear-gradient(180deg, var(--color-neutral-25), var(--color-white));
}

.subjects-page__container {
  position: relative;
}

.subjects-page__header {
  max-width: 48rem;
  margin: 0 auto clamp(2.5rem, 5vw, 4rem);
  text-align: center;
}

.subjects-page__eyebrow {
  margin-bottom: var(--space-3);
  color: var(--color-primary-700);
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.subjects-page__title {
  margin-bottom: var(--space-4);
  color: var(--color-primary-900);
  font-size: clamp(2.25rem, 4.5vw, 3.6rem);
  letter-spacing: -0.035em;
  line-height: 1.08;
}

.subjects-page__ornament {
  display: grid;
  width: min(18rem, 70%);
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-3);
  align-items: center;
  margin: 0 auto var(--space-4);
  color: var(--color-primary-400);
}

.subjects-page__ornament span:first-child,
.subjects-page__ornament span:last-child {
  height: 1px;
  background: currentColor;
  opacity: 0.62;
}

.subjects-page__subtitle {
  max-width: 40rem;
  margin: 0 auto;
  color: var(--color-text-muted);
  font-size: clamp(1rem, 1.4vw, 1.1rem);
}

.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  gap: clamp(1.25rem, 2.4vw, 2rem);
  align-items: stretch;
}

.subject-card {
  container-type: inline-size;
  display: grid;
  min-width: 0;
  grid-template-columns: minmax(10.5rem, 0.92fr) minmax(13rem, 1.08fr);
  overflow: hidden;
  border: 1px solid rgba(96, 71, 139, 0.14);
  border-radius: var(--radius-xl);
  background: var(--color-white);
  box-shadow: 0 14px 38px rgba(53, 42, 70, 0.09);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-slow);
}

.subject-card:hover {
  border-color: var(--color-primary-300);
  box-shadow: 0 20px 48px rgba(53, 42, 70, 0.14);
  transform: translateY(-0.3rem);
}

.subject-card__visual {
  min-height: 22rem;
  overflow: hidden;
  background: var(--color-primary-100);
}

.subject-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
}

.subject-card:hover .subject-card__image {
  transform: scale(1.025);
}

.subject-card__content {
  display: flex;
  min-width: 0;
  flex-direction: column;
  align-items: flex-start;
  padding: clamp(1.5rem, 2.4vw, 2.25rem);
  background:
    linear-gradient(145deg, rgba(247, 245, 251, 0.88), rgba(255, 255, 255, 0.96));
}

.subject-card__icon {
  display: grid;
  width: 3.2rem;
  height: 3.2rem;
  place-items: center;
  margin-bottom: var(--space-4);
  border: 1px solid rgba(96, 71, 139, 0.12);
  border-radius: 50%;
  background: var(--color-primary-100);
  color: var(--color-primary-700);
  font-family: var(--font-heading);
  font-size: 0.88rem;
  font-weight: 700;
}

.subject-card__title {
  margin-bottom: var(--space-3);
  color: var(--color-primary-900);
  font-size: clamp(1.6rem, 2.4vw, 2.05rem);
}

.subject-card__rule {
  display: block;
  width: 3.75rem;
  height: 2px;
  margin-bottom: var(--space-5);
  border-radius: var(--radius-pill);
  background: var(--color-primary-400);
}

.subject-card__benefits {
  display: grid;
  gap: 0.68rem;
  padding: 0;
  margin: 0 0 var(--space-6);
  color: var(--color-neutral-700);
  font-size: 0.95rem;
  line-height: 1.5;
  list-style: none;
}

.subject-card__benefits li {
  position: relative;
  padding-left: 1.15rem;
}

.subject-card__benefits li::before {
  position: absolute;
  top: 0.64em;
  left: 0;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: var(--color-primary-500);
  content: "";
  transform: translateY(-50%);
}

.subject-card__button {
  display: inline-flex;
  min-height: 2.8rem;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.65rem 1.1rem;
  margin-top: auto;
  border: 1px solid var(--color-primary-400);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.74);
  color: var(--color-primary-800);
  font-size: var(--font-size-sm);
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-base);
}

.subject-card__button span {
  transition: transform var(--transition-base);
}

.subject-card__button:hover {
  border-color: var(--color-primary-700);
  background: var(--color-primary-700);
  color: var(--color-white);
  transform: translateY(-1px);
}

.subject-card__button:hover span {
  transform: translateX(0.2rem);
}

/* When automatic grid columns become narrow, the card itself
   changes to image-above-text without any manual repositioning. */
@container (max-width: 31rem) {
  .subject-card {
    grid-template-columns: 1fr;
  }

  .subject-card__visual {
    min-height: 0;
    aspect-ratio: 4 / 3;
  }

  .subject-card__content {
    min-height: 20rem;
  }
}

.subjects-closing {
  border-top: 1px solid rgba(96, 71, 139, 0.09);
  border-bottom: 1px solid rgba(96, 71, 139, 0.09);
  background:
    linear-gradient(90deg, var(--color-primary-50), #fbf9fd 52%, var(--color-primary-50));
}

.subjects-closing__container {
  display: grid;
  max-width: 52rem;
  grid-template-columns: auto 1px 1fr;
  gap: var(--space-6);
  align-items: center;
  padding-block: clamp(1.6rem, 3vw, 2.35rem);
}

.subjects-closing__mark {
  color: var(--color-primary-600);
  font-family: Georgia, serif;
  font-size: 2rem;
  line-height: 1;
}

.subjects-closing__divider {
  width: 1px;
  height: 3rem;
  background: var(--color-primary-300);
}

.subjects-closing__quote {
  margin-bottom: 0.2rem;
  color: var(--color-primary-900);
  font-family: var(--font-heading);
  font-size: clamp(1rem, 1.7vw, 1.18rem);
  font-weight: 700;
}

.subjects-closing__note {
  margin-bottom: 0;
  color: var(--color-primary-600);
  font-family: var(--font-heading);
  font-size: var(--font-size-sm);
  font-style: italic;
}

@media (max-width: 47.99rem) {
  .subjects-page {
    padding-block: var(--space-12);
  }

  .subjects-page__header {
    margin-bottom: var(--space-8);
  }

  .subject-grid {
    grid-template-columns: 1fr;
  }

  .subject-card {
    grid-template-columns: 1fr;
  }

  .subject-card__visual {
    min-height: 0;
    aspect-ratio: 4 / 3;
  }

  .subject-card__content {
    min-height: 19rem;
  }

  .subjects-closing__container {
    grid-template-columns: auto 1fr;
    gap: var(--space-4);
  }

  .subjects-closing__divider {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .subject-card,
  .subject-card__image,
  .subject-card__button,
  .subject-card__button span {
    transition: none;
  }
}

/* =========================================================
   FOUNDATIONS OF MATHEMATICS
   courses/mathematics/foundations.html
   ========================================================= */

.foundations-page {
  position: relative;
  min-height: calc(100svh - var(--header-height));
  border-bottom: 1px solid var(--color-border);
  background:
    radial-gradient(circle at 92% 8%, rgba(222, 213, 239, 0.44), transparent 24rem),
    linear-gradient(180deg, var(--color-white), var(--color-neutral-25));
}

.foundations-page__container {
  padding-block: clamp(var(--space-8), 5vw, var(--space-16));
}

.breadcrumb {
  margin-bottom: var(--space-8);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding: 0;
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  list-style: none;
}

.breadcrumb__list li + li::before {
  margin-right: var(--space-2);
  color: var(--color-primary-400);
  content: "/";
}

.breadcrumb__list a {
  color: var(--color-primary-800);
  font-weight: 600;
  text-decoration: none;
}

.breadcrumb__list a:hover {
  text-decoration: underline;
}

.foundations-page__header {
  max-width: 48rem;
  margin: 0 auto clamp(var(--space-8), 5vw, var(--space-12));
  text-align: center;
}

.foundations-page__eyebrow {
  margin-bottom: var(--space-3);
  color: var(--color-primary-700);
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.foundations-page__title {
  margin-bottom: var(--space-4);
  color: var(--color-primary-900);
  font-size: clamp(2.35rem, 5vw, 4.3rem);
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.foundations-page__ornament {
  display: grid;
  width: min(100%, 17rem);
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-3);
  align-items: center;
  margin: 0 auto var(--space-5);
  color: var(--color-accent-gold);
}

.foundations-page__ornament span:first-child,
.foundations-page__ornament span:last-child {
  height: 1px;
  background: currentColor;
  opacity: 0.55;
}

.foundations-page__ornament span:nth-child(2) {
  font-size: 1rem;
  line-height: 1;
}

.foundations-page__intro {
  max-width: 42rem;
  margin: 0 auto;
  color: var(--color-text-muted);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
}

.foundations-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
  max-width: 62rem;
  margin-inline: auto;
}

.foundations-card {
  display: grid;
  min-width: 0;
  grid-template-columns: 3.25rem minmax(0, 1fr) auto;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-5) var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-sm);
  color: var(--color-primary-900);
  text-decoration: none;
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    box-shadow var(--transition-base),
    transform var(--transition-base);
}

.foundations-card:hover {
  border-color: var(--color-primary-300);
  background: var(--color-white);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.foundations-card__symbol {
  display: grid;
  width: 3.25rem;
  height: 3.25rem;
  place-items: center;
  border-radius: 50%;
  background: var(--color-primary-100);
  color: var(--color-primary-700);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
}

.foundations-card__content {
  display: grid;
  min-width: 0;
  gap: 0.2rem;
}

.foundations-card__title {
  color: var(--color-primary-900);
  font-family: var(--font-heading);
  font-size: clamp(1.05rem, 1.7vw, 1.25rem);
  line-height: 1.3;
}

.foundations-card__description {
  color: var(--color-text-muted);
  font-size: 0.78rem;
  line-height: 1.45;
}

.foundations-card__arrow {
  color: var(--color-primary-500);
  font-size: 1.25rem;
  transition: transform var(--transition-base);
}

.foundations-card:hover .foundations-card__arrow {
  transform: translateX(0.2rem);
}

.foundations-page__back {
  display: flex;
  justify-content: center;
  margin-top: var(--space-10);
}

@media (max-width: 47.99rem) {
  .foundations-page__container {
    padding-block: var(--space-8) var(--space-12);
  }

  .breadcrumb {
    margin-bottom: var(--space-6);
  }

  .foundations-page__header {
    margin-bottom: var(--space-8);
  }

  .foundations-grid {
    grid-template-columns: 1fr;
  }

  .foundations-card {
    padding: var(--space-4) var(--space-5);
  }
}

@media (max-width: 31.99rem) {
  .foundations-card {
    grid-template-columns: 2.8rem minmax(0, 1fr) auto;
    gap: var(--space-3);
  }

  .foundations-card__symbol {
    width: 2.8rem;
    height: 2.8rem;
    font-size: 0.9rem;
  }

  .foundations-card__description {
    font-size: 0.73rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .foundations-card,
  .foundations-card__arrow {
    transition: none;
  }
}

/* =========================================================
   SHARED HEADER — ALWAYS VISIBLE SIMPLE NAVIGATION
   ========================================================= */

.site-header__navigation {
  position: static;
  display: flex;
  width: auto;
  align-items: center;
  flex-direction: row;
  gap: clamp(var(--space-4), 2vw, var(--space-8));
  padding: 0;
  overflow: visible;
  border: 0;
  background: transparent;
  box-shadow: none;
  opacity: 1;
  pointer-events: auto;
  transform: none;
  visibility: visible;
}

.site-nav {
  display: flex;
  align-items: center;
  flex-direction: row;
  gap: clamp(0.15rem, 0.55vw, var(--space-2));
}

.site-header__account-actions {
  display: flex;
  align-items: center;
}

.site-header__menu-button {
  display: none;
}

/* =========================================================
   SHARED HEADER — STICKY WRAPPER FIX
   The shared <header> is injected inside #site-header.
   The wrapper must be sticky so it can remain at the top
   for the full page scroll.
   ========================================================= */

#site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
}

#site-header .site-header {
  position: relative;
  top: auto;
}