/* Reusable national-certificate-first subject hubs. */
:root {
  --subject-accent: #2563eb;
  --subject-accent-dark: #1746a2;
  --subject-accent-soft: #dbeafe;
  --subject-ink: #101828;
  --subject-muted: #667085;
  --subject-line: rgba(15, 23, 42, .10);
  --subject-surface: #ffffff;
  --subject-shadow: 0 20px 52px rgba(15, 23, 42, .10);
}

body.subject-hub-page[data-tone="rose"] {
  --subject-accent: #e11d48;
  --subject-accent-dark: #9f1239;
  --subject-accent-soft: #ffe4e6;
}

body.subject-hub-page[data-tone="amber"] {
  --subject-accent: #d97706;
  --subject-accent-dark: #92400e;
  --subject-accent-soft: #fef3c7;
}

body.subject-hub-page[data-tone="green"] {
  --subject-accent: #059669;
  --subject-accent-dark: #065f46;
  --subject-accent-soft: #d1fae5;
}

body.subject-hub-page[data-tone="violet"] {
  --subject-accent: #7c3aed;
  --subject-accent-dark: #5b21b6;
  --subject-accent-soft: #ede9fe;
}

body.subject-hub-page[data-tone="blue"] {
  --subject-accent: #2563eb;
  --subject-accent-dark: #1e40af;
  --subject-accent-soft: #dbeafe;
}

body.subject-hub-page[data-tone="teal"] {
  --subject-accent: #0f766e;
  --subject-accent-dark: #115e59;
  --subject-accent-soft: #ccfbf1;
}

body.subject-hub-page[data-tone="indigo"] {
  --subject-accent: #4f46e5;
  --subject-accent-dark: #3730a3;
  --subject-accent-soft: #e0e7ff;
}

body.subject-hub-page[data-tone="cyan"] {
  --subject-accent: #0891b2;
  --subject-accent-dark: #155e75;
  --subject-accent-soft: #cffafe;
}

body.subject-hub-page[data-tone="slate"] {
  --subject-accent: #475569;
  --subject-accent-dark: #1e293b;
  --subject-accent-soft: #e2e8f0;
}

body.subject-hub-page {
  background:
    radial-gradient(circle at 92% 0, color-mix(in srgb, var(--subject-accent) 13%, transparent), transparent 27%),
    radial-gradient(circle at 8% 5%, color-mix(in srgb, var(--subject-accent) 9%, transparent), transparent 24%),
    #f5f7fa;
  color: var(--subject-ink);
}

body.subject-hub-page .subject-main {
  width: 100%;
  max-width: 1240px;
  padding: 32px 36px 84px;
}

body.subject-hub-page[data-view="certificate"] .subject-main {
  max-width: none;
}

.subject-back-link {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 9px 15px;
  border: 1px solid var(--subject-line);
  border-radius: 11px;
  background: rgba(255, 255, 255, .9);
  box-shadow: 0 9px 22px rgba(15, 23, 42, .07);
  color: var(--subject-ink);
  font-weight: 900;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease;
}

.subject-back-link:hover {
  box-shadow: 0 13px 28px rgba(15, 23, 42, .10);
  transform: translateY(-1px);
}

.subject-hero,
.subject-certificate-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
  margin-top: 18px;
  padding: clamp(30px, 5vw, 62px);
  border-radius: 30px;
  background:
    linear-gradient(135deg, #08111f 0%, #13233b 54%, var(--subject-accent-dark) 130%);
  box-shadow: 0 30px 74px rgba(15, 23, 42, .23);
  color: #ffffff;
  overflow: hidden;
}

.subject-hero::before,
.subject-certificate-hero::before {
  content: "";
  position: absolute;
  width: 440px;
  height: 440px;
  top: -270px;
  right: -190px;
  border: 72px solid rgba(255, 255, 255, .055);
  border-radius: 50%;
}

.subject-hero::after,
.subject-certificate-hero::after {
  content: "";
  position: absolute;
  width: 190px;
  height: 190px;
  left: 46%;
  bottom: -160px;
  border: 42px solid color-mix(in srgb, var(--subject-accent) 28%, transparent);
  transform: rotate(22deg);
}

.subject-hero > *,
.subject-certificate-hero > * {
  position: relative;
  z-index: 1;
}

.subject-kicker,
.subject-eyebrow {
  display: inline-flex;
  align-items: center;
  color: color-mix(in srgb, var(--subject-accent-soft) 88%, white);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: .09em;
  text-transform: uppercase;
}

.subject-kicker {
  min-height: 30px;
  padding: 6px 11px;
  border: 1px solid color-mix(in srgb, var(--subject-accent) 42%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--subject-accent) 18%, transparent);
}

.subject-hero h1,
.subject-certificate-hero h1 {
  max-width: 820px;
  margin: 18px 0 15px;
  color: #ffffff;
  font-size: clamp(37px, 5.2vw, 66px);
  line-height: 1;
  letter-spacing: -.046em;
}

.subject-hero h1 span,
.subject-certificate-hero h1 span {
  color: color-mix(in srgb, var(--subject-accent-soft) 75%, white);
}

.subject-hero-copy > p,
.subject-certificate-hero p {
  max-width: 720px;
  margin: 0;
  color: rgba(255, 255, 255, .76);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.7;
}

.subject-hero-actions,
.subject-priority-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 11px;
  margin-top: 27px;
}

.subject-primary-button,
.subject-secondary-button,
.subject-priority-button,
.subject-official-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 18px;
  border-radius: 12px;
  font-weight: 950;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.subject-primary-button,
.subject-priority-button {
  background: var(--subject-accent);
  box-shadow: 0 12px 28px color-mix(in srgb, var(--subject-accent) 34%, transparent);
  color: #ffffff;
}

.subject-secondary-button,
.subject-official-link {
  border: 1px solid rgba(255, 255, 255, .19);
  background: rgba(255, 255, 255, .08);
  color: #ffffff;
}

.subject-primary-button:hover,
.subject-secondary-button:hover,
.subject-priority-button:hover,
.subject-official-link:hover {
  transform: translateY(-2px);
}

.subject-hero-panel {
  display: flex;
  min-height: 305px;
  flex-direction: column;
  justify-content: flex-end;
  padding: 25px;
  border: 1px solid rgba(255, 255, 255, .15);
  border-radius: 23px;
  background: rgba(255, 255, 255, .09);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .12);
  backdrop-filter: blur(9px);
}

.subject-hero-icon,
.subject-certificate-mark {
  display: inline-grid;
  width: 64px;
  height: 64px;
  margin-bottom: auto;
  place-items: center;
  border-radius: 19px;
  background: color-mix(in srgb, var(--subject-accent) 26%, rgba(255, 255, 255, .08));
  color: color-mix(in srgb, var(--subject-accent-soft) 78%, white);
}

.subject-hero-icon svg,
.subject-certificate-mark svg,
.subject-priority-icon svg,
.subject-card-icon svg {
  width: 32px;
  height: 32px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
}

.subject-hero-panel small {
  color: rgba(255, 255, 255, .60);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.subject-hero-panel strong {
  display: block;
  margin-top: 5px;
  color: #ffffff;
  font-size: 29px;
  letter-spacing: -.025em;
}

.subject-hero-panel p {
  margin: 10px 0 0;
  color: rgba(255, 255, 255, .7);
  font-size: 14px;
  font-weight: 650;
  line-height: 1.55;
}

.subject-section {
  margin-top: 70px;
}

.subject-section-heading {
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(300px, 1fr);
  gap: 40px;
  align-items: end;
  margin-bottom: 23px;
}

.subject-section-heading.compact {
  align-items: center;
}

.subject-eyebrow {
  color: var(--subject-accent-dark);
}

.subject-section-heading h2,
.subject-data-checklist h2 {
  margin: 5px 0 0;
  color: var(--subject-ink);
  font-size: clamp(29px, 4vw, 44px);
  line-height: 1.08;
  letter-spacing: -.035em;
}

.subject-section-heading > p {
  margin: 0;
  color: var(--subject-muted);
  font-weight: 650;
  line-height: 1.65;
}

.subject-priority-card {
  position: relative;
  padding: clamp(25px, 4vw, 44px);
  border-radius: 26px;
  background: linear-gradient(135deg, #101828, #1d2939);
  box-shadow: 0 24px 58px rgba(15, 23, 42, .19);
  color: #ffffff;
  overflow: hidden;
}

.subject-priority-card::after {
  content: "MS";
  position: absolute;
  right: -22px;
  top: -32px;
  color: rgba(255, 255, 255, .035);
  font-size: 190px;
  font-weight: 950;
  letter-spacing: -.09em;
}

.subject-priority-card.is-planned::after {
  content: "2026";
  font-size: 120px;
}

.subject-priority-card > * {
  position: relative;
  z-index: 1;
}

.subject-priority-intro {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
}

.subject-priority-icon,
.subject-card-icon {
  display: grid;
  width: 62px;
  height: 62px;
  place-items: center;
  border-radius: 18px;
  background: color-mix(in srgb, var(--subject-accent) 25%, transparent);
  color: color-mix(in srgb, var(--subject-accent-soft) 80%, white);
}

.subject-priority-intro small {
  color: color-mix(in srgb, var(--subject-accent-soft) 76%, white);
  font-size: 11px;
  font-weight: 950;
  letter-spacing: .09em;
  text-transform: uppercase;
}

.subject-priority-intro h3 {
  margin: 4px 0 4px;
  color: #ffffff;
  font-size: clamp(23px, 3vw, 34px);
  letter-spacing: -.025em;
}

.subject-priority-intro p {
  margin: 0;
  color: rgba(255, 255, 255, .67);
  font-weight: 600;
}

.subject-priority-modules {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 27px;
}

.subject-priority-modules > div {
  min-height: 130px;
  padding: 17px;
  border: 1px solid rgba(255, 255, 255, .09);
  border-radius: 16px;
  background: rgba(255, 255, 255, .055);
}

.subject-priority-modules b {
  display: block;
  color: color-mix(in srgb, var(--subject-accent-soft) 75%, white);
  font-size: 12px;
}

.subject-priority-modules strong,
.subject-priority-modules span {
  display: block;
}

.subject-priority-modules strong {
  margin-top: 16px;
  color: #ffffff;
  font-size: 15px;
}

.subject-priority-modules span {
  margin-top: 5px;
  color: rgba(255, 255, 255, .54);
  font-size: 12px;
  font-weight: 650;
}

.subject-exam-grid,
.subject-module-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.subject-exam-card,
.subject-module-card {
  position: relative;
  display: flex;
  min-height: 310px;
  flex-direction: column;
  padding: 24px;
  border: 1px solid var(--subject-line);
  border-radius: 21px;
  background: var(--subject-surface);
  box-shadow: var(--subject-shadow);
  color: var(--subject-ink);
  text-decoration: none;
  overflow: hidden;
}

.subject-card-status {
  align-self: flex-start;
  padding: 6px 9px;
  border-radius: 999px;
  background: #f2f4f7;
  color: #475467;
  font-size: 10px;
  font-weight: 950;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.subject-card-icon {
  width: 54px;
  height: 54px;
  margin-top: 25px;
  background: var(--subject-accent-soft);
  color: var(--subject-accent-dark);
}

.subject-exam-card h3,
.subject-module-card h3,
.subject-topic-card h3 {
  margin: 20px 0 8px;
  color: var(--subject-ink);
  font-size: 21px;
  letter-spacing: -.02em;
}

.subject-exam-card p,
.subject-module-card p {
  margin: 0;
  color: var(--subject-muted);
  font-weight: 600;
  line-height: 1.62;
}

.subject-exam-card > strong {
  margin-top: auto;
  padding-top: 22px;
  color: var(--subject-accent-dark);
  font-size: 12px;
}

.subject-topic-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.subject-topic-card {
  min-height: 150px;
  padding: 20px;
  border: 1px solid var(--subject-line);
  border-radius: 17px;
  background: rgba(255, 255, 255, .84);
}

.subject-topic-card > span,
.subject-module-card > span {
  color: var(--subject-accent);
  font-size: 12px;
  font-weight: 950;
}

.subject-topic-card h3 {
  margin-top: 16px;
  font-size: 17px;
}

.subject-topic-card p {
  margin: 7px 0 0;
  color: #98a2b3;
  font-size: 12px;
  font-weight: 700;
}

.subject-quality-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin-top: 70px;
  border: 1px solid var(--subject-line);
  border-radius: 21px;
  background: #ffffff;
  box-shadow: var(--subject-shadow);
  overflow: hidden;
}

.subject-quality-strip > div {
  padding: 24px;
}

.subject-quality-strip > div + div {
  border-left: 1px solid var(--subject-line);
}

.subject-quality-strip strong,
.subject-quality-strip span {
  display: block;
}

.subject-quality-strip strong {
  color: var(--subject-ink);
  font-size: 15px;
}

.subject-quality-strip span {
  margin-top: 6px;
  color: var(--subject-muted);
  font-size: 12px;
  font-weight: 650;
  line-height: 1.5;
}

.subject-certificate-hero {
  grid-template-columns: minmax(0, 1fr) 105px;
}

.subject-certificate-mark {
  width: 92px;
  height: 92px;
  margin: 0;
  border-radius: 27px;
}

.subject-certificate-mark svg {
  width: 45px;
  height: 45px;
}

.subject-disclosure {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 20px;
  align-items: center;
  margin-top: 18px;
  padding: 20px 23px;
  border: 1px solid color-mix(in srgb, var(--subject-accent) 25%, transparent);
  border-radius: 16px;
  background: color-mix(in srgb, var(--subject-accent-soft) 58%, white);
}

.subject-disclosure strong {
  color: var(--subject-accent-dark);
  font-size: 16px;
}

.subject-disclosure p {
  margin: 0;
  color: #475467;
  font-size: 13px;
  font-weight: 650;
  line-height: 1.55;
}

.subject-module-card {
  min-height: 260px;
}

.subject-module-card.is-ready {
  border-color: color-mix(in srgb, var(--subject-accent) 30%, transparent);
  background: linear-gradient(145deg, #ffffff, color-mix(in srgb, var(--subject-accent-soft) 36%, white));
  transition: transform .2s ease, box-shadow .2s ease;
}

.subject-module-card.is-ready:hover {
  box-shadow: 0 24px 50px color-mix(in srgb, var(--subject-accent) 16%, transparent);
  transform: translateY(-3px);
}

.subject-module-card > b {
  margin-top: auto;
  padding-top: 20px;
  color: var(--subject-accent-dark);
  font-size: 12px;
}

.subject-data-checklist {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(380px, 1fr);
  gap: 42px;
  align-items: center;
  margin-top: 70px;
  padding: clamp(25px, 4vw, 42px);
  border: 1px solid var(--subject-line);
  border-radius: 24px;
  background: #ffffff;
  box-shadow: var(--subject-shadow);
}

.subject-data-checklist ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.subject-data-checklist li {
  position: relative;
  min-height: 54px;
  padding: 16px 15px 14px 42px;
  border-radius: 13px;
  background: #f8fafc;
  color: #344054;
  font-size: 13px;
  font-weight: 750;
}

.subject-data-checklist li::before {
  content: "✓";
  position: absolute;
  left: 16px;
  color: var(--subject-accent);
  font-weight: 950;
}

.subject-load-error {
  padding: 30px;
  border-radius: 16px;
  background: #fff1f2;
  color: #9f1239;
  font-weight: 800;
}

/* Simple exam-first layout shared by every subject hub. */
body.subject-hub-page[data-view="hub"] .subject-main {
  max-width: 1220px;
}

body.subject-hub-page[data-view="certificate"] .subject-main {
  max-width: none;
}

body.subject-hub-page[data-view="hub"],
body.subject-hub-page[data-view="certificate"] {
  min-height: 100vh;
  background:
    radial-gradient(circle at 92% 6%, color-mix(in srgb, var(--subject-accent) 18%, transparent) 0, transparent 27%),
    radial-gradient(circle at 14% 86%, color-mix(in srgb, var(--subject-accent-dark) 9%, transparent) 0, transparent 30%),
    linear-gradient(135deg, rgba(255, 255, 255, .94), rgba(255, 255, 255, .18) 36%, transparent 60%),
    linear-gradient(145deg, #ffffff 0%, #f6f7fb 48%, color-mix(in srgb, var(--subject-accent-soft) 58%, white) 100%);
  background-attachment: fixed;
}

.math-teacher-promo-strip {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 13px;
  min-height: 66px;
  margin-top: 15px;
  padding: 12px 16px;
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 16px;
  background: linear-gradient(105deg, #111827 0%, #173f5f 60%, #047a45 100%);
  box-shadow: 0 17px 36px rgba(15, 23, 42, .16);
  color: #ffffff;
  text-decoration: none;
}

.math-teacher-promo-strip:hover {
  transform: translateY(-1px);
  box-shadow: 0 21px 42px rgba(15, 23, 42, .20);
}

.math-teacher-promo-strip > span:first-child {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 11px;
  background: rgba(255, 255, 255, .12);
  color: #9df2c4;
  font-size: 19px;
}

.math-teacher-promo-strip strong,
.math-teacher-promo-strip small {
  display: block;
}

.math-teacher-promo-strip strong {
  font-size: 15px;
  font-weight: 950;
}

.math-teacher-promo-strip small {
  margin-top: 3px;
  color: rgba(255, 255, 255, .66);
  font-size: 11px;
  font-weight: 700;
}

.math-teacher-promo-strip b {
  font-size: 22px;
}

.subject-teacher-promo-strip {
  background: linear-gradient(105deg, #101828 0%, var(--subject-accent-dark) 62%, var(--subject-accent) 125%);
}

.subject-teacher-promo-strip > span:first-child {
  color: #ffffff;
}

.subject-teacher-promo-strip > span:first-child svg {
  width: 21px;
  height: 21px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}

.russian-teacher-promo-strip {
  background: linear-gradient(105deg, #111827 0%, #312e81 58%, #6d28d9 100%);
}

.russian-teacher-promo-strip > span:first-child {
  color: #ddd6fe;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 800;
}

.physics-teacher-promo-strip {
  background: linear-gradient(105deg, #071120 0%, #123d69 58%, #2563eb 100%);
}

.physics-teacher-promo-strip > span:first-child {
  color: #bae6fd;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 800;
}

.ona-certificate-test-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  padding-top: 28px;
}

.history-catalog-heading {
  grid-column: 1 / -1;
  max-width: 820px;
  padding: 6px 2px 0;
}

.history-catalog-heading--sessions {
  margin-top: 18px;
  padding-top: 28px;
  border-top: 1px solid color-mix(in srgb, var(--subject-accent) 25%, transparent);
}

.history-catalog-heading span {
  color: var(--subject-accent-dark);
  font-size: .76rem;
  font-weight: 900;
  letter-spacing: .09em;
  text-transform: uppercase;
}

.history-catalog-heading h2 {
  margin: 7px 0 8px;
  color: var(--subject-ink);
  font-size: clamp(25px, 3vw, 36px);
  line-height: 1.1;
  letter-spacing: -.035em;
}

.history-catalog-heading p {
  max-width: 700px;
  margin: 0;
  color: var(--subject-muted);
  line-height: 1.6;
}

.ona-certificate-intro {
  max-width: 900px;
  padding-top: 10px;
}

.ona-certificate-intro h1 {
  margin: 0;
  color: var(--subject-ink);
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.04;
  letter-spacing: -.045em;
}

.ona-certificate-test-card {
  position: relative;
  display: flex;
  min-height: 240px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-end;
  gap: 10px;
  padding: clamp(25px, 4vw, 38px);
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 32px;
  background:
    radial-gradient(circle at 88% 20%, rgba(255, 255, 255, .18), transparent 24%),
    linear-gradient(135deg, var(--subject-accent-dark) 0%, var(--subject-accent) 58%, color-mix(in srgb, var(--subject-accent) 72%, white) 120%);
  box-shadow: 0 28px 70px color-mix(in srgb, var(--subject-accent-dark) 26%, transparent);
  color: #ffffff;
  text-decoration: none;
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
}

.ona-certificate-test-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 34px 78px color-mix(in srgb, var(--subject-accent-dark) 32%, transparent);
}

.ona-certificate-test-card::before {
  content: "";
  position: absolute;
  width: 260px;
  height: 260px;
  top: -120px;
  right: -65px;
  border: 42px solid rgba(255, 255, 255, .08);
  border-radius: 50%;
}

.ona-certificate-test-card > * {
  position: relative;
  z-index: 1;
}

.ona-certificate-test-card h2 {
  position: relative;
  margin: 4px 0 0;
  color: #ffffff;
  font-size: clamp(36px, 4.2vw, 52px);
  line-height: 1;
  letter-spacing: -.045em;
  overflow-wrap: anywhere;
}

.ona-certificate-test-card small {
  color: rgba(255, 255, 255, .78);
  font-weight: 700;
}

.ona-certificate-test-card p {
  max-width: 310px;
  margin: 0;
  color: rgba(255, 255, 255, .9);
  line-height: 1.55;
}

.ona-certificate-test-card strong {
  margin-top: 8px;
  color: #ffffff;
}

.ona-certificate-badge {
  align-self: flex-start;
  padding: 7px 11px;
  border: 1px solid rgba(255, 255, 255, .3);
  border-radius: 999px;
  background: rgba(255, 255, 255, .16);
  color: #ffffff;
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.ona-test-list {
  display: grid;
  gap: 22px;
  margin-top: clamp(34px, 5vw, 58px);
}

.ona-test-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.ona-test-card {
  --ona-card-accent: #be123c;
  --ona-card-soft: #ffe4e6;
  position: relative;
  display: flex;
  min-height: 320px;
  flex-direction: column;
  padding: clamp(26px, 3vw, 36px);
  border: 1px solid rgba(15, 23, 42, .08);
  border-radius: 30px;
  background:
    radial-gradient(circle at 100% 0, color-mix(in srgb, var(--ona-card-soft) 80%, transparent), transparent 35%),
    rgba(255, 255, 255, .92);
  box-shadow: 0 20px 50px rgba(15, 23, 42, .09);
  color: var(--subject-ink);
  text-decoration: none;
  overflow: hidden;
  transition: transform .24s ease, box-shadow .24s ease, border-color .24s ease;
}

.ona-test-grid .ona-test-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--ona-card-accent), color-mix(in srgb, var(--ona-card-accent) 42%, white));
}

.ona-test-grid .ona-test-card::after {
  content: "";
  position: absolute;
  width: 150px;
  height: 150px;
  top: -76px;
  right: -62px;
  border: 24px solid color-mix(in srgb, var(--ona-card-accent) 8%, transparent);
  border-radius: 50%;
}

.ona-test-grid .ona-test-card:nth-child(2) {
  --ona-card-accent: #7c3aed;
  --ona-card-soft: #ede9fe;
}

.ona-test-grid .ona-test-card:nth-child(3) {
  --ona-card-accent: #0369a1;
  --ona-card-soft: #e0f2fe;
}

.ona-test-grid .ona-test-card:hover {
  border-color: color-mix(in srgb, var(--ona-card-accent) 22%, transparent);
  box-shadow: 0 28px 66px color-mix(in srgb, var(--ona-card-accent) 13%, transparent);
  transform: translateY(-6px);
}

.ona-test-card-primary {
  min-height: 390px;
  border: 0;
  background:
    radial-gradient(circle at 83% 13%, rgba(255, 255, 255, .19), transparent 21%),
    linear-gradient(125deg, var(--subject-accent-dark) 0%, var(--subject-accent) 52%, color-mix(in srgb, var(--subject-accent) 72%, white) 120%);
  box-shadow: 0 32px 78px color-mix(in srgb, var(--subject-accent-dark) 29%, transparent);
  color: #ffffff;
  transition: transform .2s ease, box-shadow .2s ease;
}

.ona-test-card-primary::before {
  content: "";
  position: absolute;
  width: 330px;
  height: 330px;
  right: -90px;
  bottom: -215px;
  border: 58px solid rgba(255, 255, 255, .07);
  border-radius: 50%;
}

.ona-test-card-primary::after {
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  top: -118px;
  left: 43%;
  border: 34px solid rgba(255, 255, 255, .055);
  border-radius: 46px;
  transform: rotate(28deg);
}

.ona-test-card-primary:hover {
  box-shadow: 0 38px 88px color-mix(in srgb, var(--subject-accent-dark) 36%, transparent);
  transform: translateY(-5px);
}

.ona-test-card-primary.is-coming-soon {
  cursor: default;
}

.ona-test-card-primary.is-coming-soon:hover {
  transform: none;
}

.ona-certificate-empty {
  padding: clamp(26px, 4vw, 38px);
  border: 1px solid var(--subject-line);
  border-radius: 26px;
  background: rgba(255, 255, 255, .9);
  box-shadow: var(--subject-shadow);
}

.ona-certificate-empty h2 {
  margin: 0;
  color: var(--subject-ink);
  font-size: clamp(25px, 3vw, 34px);
}

.ona-certificate-empty p {
  margin: 10px 0 0;
  color: var(--subject-muted);
  line-height: 1.6;
}

.ona-test-card-topline {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.ona-test-status {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 13px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 950;
  letter-spacing: .055em;
  text-transform: uppercase;
}

.ona-test-status {
  background: rgba(255, 255, 255, .16);
  color: #ffffff;
}

.ona-test-arrow {
  position: relative;
  z-index: 2;
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  border-radius: 50%;
  background: #ffffff;
  color: var(--subject-accent-dark);
  font-size: 28px;
  font-weight: 800;
  box-shadow: 0 12px 28px rgba(88, 8, 36, .22);
  transition: transform .22s ease;
}

.ona-test-card-primary:hover .ona-test-arrow {
  transform: translateX(4px);
}

.ona-test-card-body {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: flex-end;
  gap: 22px;
  margin-top: auto;
}

.ona-test-icon {
  display: grid;
  width: 66px;
  height: 66px;
  flex: 0 0 66px;
  place-items: center;
  border-radius: 20px;
  background: var(--ona-card-soft);
  color: var(--ona-card-accent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--ona-card-accent) 8%, transparent);
}

.ona-test-card-primary .ona-test-icon {
  background: rgba(255, 255, 255, .15);
  color: #ffffff;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .09);
}

.ona-test-icon svg {
  width: 32px;
  height: 32px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
}

.ona-test-card h2 {
  margin: 0;
  color: var(--subject-ink);
  font-size: clamp(24px, 2.5vw, 32px);
  line-height: 1.08;
  letter-spacing: -.035em;
}

.ona-test-card-primary h2 {
  color: #ffffff;
  font-size: clamp(42px, 5vw, 62px);
}

.ona-test-card p {
  margin: 10px 0 0;
  color: var(--subject-muted);
  font-weight: 650;
  line-height: 1.55;
}

.ona-test-card-primary p {
  max-width: 710px;
  color: rgba(255, 255, 255, .82);
  font-size: 18px;
}

.ona-test-grid .ona-test-card-body {
  flex: 1;
  align-items: flex-start;
  flex-direction: column;
  justify-content: flex-end;
  margin-top: 0;
}

.ona-test-grid .ona-test-icon {
  width: 72px;
  height: 72px;
  flex-basis: 72px;
  border-radius: 22px;
}

.ona-test-grid .ona-test-card h2 {
  font-size: clamp(27px, 2.5vw, 35px);
}

.ona-test-grid .ona-test-card p {
  font-size: 15px;
}


@media (max-width: 1050px) {
  .subject-hero {
    grid-template-columns: minmax(0, 1fr) 270px;
  }

  .subject-priority-modules,
  .subject-topic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ona-test-grid {
    grid-template-columns: 1fr;
  }

  .ona-test-grid .ona-test-card {
    min-height: 270px;
  }

  .ona-certificate-test-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  body.subject-hub-page .subject-main {
    padding: 76px 18px 66px;
  }

  .subject-hero,
  .subject-certificate-hero {
    grid-template-columns: 1fr;
    padding: 30px 24px;
    border-radius: 23px;
  }

  .subject-hero-panel {
    min-height: 230px;
  }

  .subject-certificate-mark {
    display: none;
  }

  .subject-section {
    margin-top: 54px;
  }

  .subject-section-heading,
  .subject-data-checklist {
    grid-template-columns: 1fr;
    gap: 17px;
  }

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

  .subject-exam-card,
  .subject-module-card {
    min-height: 250px;
  }

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

  .subject-quality-strip > div + div {
    border-top: 1px solid var(--subject-line);
    border-left: 0;
  }

  .ona-test-card-primary {
    min-height: 350px;
  }

  .ona-certificate-test-card {
    min-height: 250px;
    border-radius: 22px;
  }
}

@media (max-width: 540px) {
  .ona-certificate-test-list {
    grid-template-columns: 1fr;
  }

  .subject-hero h1,
  .subject-certificate-hero h1 {
    font-size: 37px;
  }

  .subject-hero-actions,
  .subject-priority-actions {
    display: grid;
  }

  .subject-primary-button,
  .subject-secondary-button,
  .subject-priority-button,
  .subject-official-link {
    width: 100%;
  }

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

  .subject-priority-modules,
  .subject-topic-grid,
  .subject-data-checklist ul {
    grid-template-columns: 1fr;
  }

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

  .ona-test-card {
    min-height: 270px;
    border-radius: 21px;
  }

  .ona-test-card-primary {
    min-height: 360px;
  }

  .ona-test-card-body {
    align-items: flex-start;
    flex-direction: column;
  }

  .math-teacher-promo-strip {
    min-height: 60px;
    padding: 10px 12px;
  }

  .math-teacher-promo-strip small {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .subject-hub-page *,
  .subject-hub-page *::before,
  .subject-hub-page *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}