:root {
  --background: #ffffff;
  --foreground: #0f172a;
  --blue: #1664d9;
  --blue-deep: #0b3f9c;
  --blue-soft: #e8f1ff;
  --line: #d9e2f2;
  --muted: #536171;
  --green: #11855b;
  --mint: #17a37b;
  --gold: #d99618;
  --rose: #df5d78;
  --violet: #7357d8;
  --shadow: 0 18px 42px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 14% 12%, rgba(22, 100, 217, 0.09), transparent 27%),
    radial-gradient(circle at 88% 16%, rgba(23, 163, 123, 0.08), transparent 24%),
    var(--background);
  color: var(--foreground);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

button {
  font: inherit;
}

.site-shell {
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(232, 241, 255, 0.86) 0, rgba(255, 255, 255, 0) 390px),
    linear-gradient(90deg, rgba(22, 100, 217, 0.05) 1px, transparent 1px),
    linear-gradient(180deg, rgba(22, 100, 217, 0.05) 1px, transparent 1px),
    #ffffff;
  background-size: auto, 44px 44px, 44px 44px, auto;
  color: #0b1220;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 0 48px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}

.brand,
.topbar nav button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  background: transparent;
  color: #0b1220;
  cursor: pointer;
}

.topbar nav {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand {
  gap: 10px;
  min-height: 44px;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--blue), #18a1d6);
  color: #ffffff;
  font-weight: 900;
  box-shadow: 0 10px 22px rgba(22, 100, 217, 0.24);
}

.brand-mark svg {
  width: 27px;
  height: 27px;
  fill: currentColor;
}

.topbar nav button {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 700;
}

.category-menu {
  position: relative;
}

.category-menu summary {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  padding: 0 14px;
  color: #0b1220;
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

.category-menu summary::-webkit-details-marker {
  display: none;
}

.category-menu summary::after {
  width: 7px;
  height: 7px;
  border-bottom: 2px solid currentColor;
  border-right: 2px solid currentColor;
  content: "";
  transform: translateY(-2px) rotate(45deg);
  transition: transform 160ms ease;
}

.category-menu[open] summary::after {
  transform: translateY(2px) rotate(225deg);
}

.category-menu summary:hover,
.category-menu summary:focus-visible,
.category-menu[open] summary {
  border-color: var(--blue);
  color: var(--blue-deep);
  outline: none;
}

.category-menu-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 20;
  display: grid;
  width: min(240px, calc(100vw - 32px));
  grid-template-columns: 1fr;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.98);
  padding: 10px;
  box-shadow: 0 22px 56px rgba(15, 23, 42, 0.16);
  backdrop-filter: blur(12px);
}

.topbar nav .category-menu-panel button {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: center;
  justify-content: stretch;
  gap: 10px;
  min-height: 52px;
  border-color: #e2eaf6;
  background: #ffffff;
  padding: 8px 12px 8px 6px;
  color: #0b1220;
  font-size: 0.9rem;
  text-align: left;
}

.topbar nav .category-menu-panel button > span:last-child {
  display: flex;
  min-height: 40px;
  align-items: center;
  justify-self: start;
  min-width: 0;
  text-align: left;
  line-height: 1.2;
}

.topbar nav .category-menu-panel button:hover,
.topbar nav .category-menu-panel button:focus-visible {
  border-color: var(--blue);
  background: var(--blue-soft);
  color: var(--blue-deep);
}

.menu-icon {
  display: grid;
  width: 42px;
  height: 32px;
  flex: 0 0 auto;
  justify-self: center;
  place-items: center;
  color: var(--blue);
}

.menu-icon svg {
  display: block;
  width: 24px;
  height: 24px;
  fill: currentColor;
  stroke: none;
}

.menu-icon .icon-cutout {
  fill: #ffffff;
  opacity: 0.92;
}

.topbar nav button:hover,
.topbar nav button:focus-visible {
  border-color: var(--blue);
  color: var(--blue-deep);
  outline: none;
}

.hero-band {
  display: block;
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 18px 0 18px;
}

.hero-top-ad,
.quiz-bottom-ad {
  width: min(1160px, calc(100% - 40px));
  margin: 16px auto;
}

.hero-band > div:first-child {
  position: relative;
  padding-left: 18px;
}

.hero-band > div:first-child::before {
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 0;
  width: 5px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--blue), var(--mint), var(--gold));
  content: "";
}

.hero-band h1 {
  max-width: 860px;
  margin: 0;
  font-size: clamp(1.75rem, 3.3vw, 3.45rem);
  line-height: 1.04;
  letter-spacing: 0;
}

.eyebrow,
.section-kicker {
  margin: 0 0 10px;
  color: var(--blue-deep);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.adv {
  display: block;
  width: 100%;
  height: auto;
  min-height: 0;
  margin: 0;
  padding: 0;
  overflow: hidden;
  text-align: center;
}

.adv:empty {
  display: none;
  height: 0;
  margin: 0;
  padding: 0;
}

.adv:has(iframe) {
  margin: 0.8rem 0;
}

.adv p {
  display: none;
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.adv:has(iframe) p {
  display: block;
}

.adv a {
  display: block;
  width: 100%;
}

.adv img {
  display: block;
  width: 100%;
  height: auto;
}

.category-grid,
.category-heading,
.content-layout,
.quiz-layout,
.result-layout {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding-bottom: 40px;
}

.category-heading h2 {
  margin: 0;
  color: #0b1220;
  font-size: clamp(1.45rem, 2.4vw, 2.25rem);
  line-height: 1.1;
  letter-spacing: 0;
}

.category-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.category-card {
  position: relative;
  display: flex;
  min-height: 232px;
  flex-direction: column;
  align-items: flex-start;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--accent, var(--blue)) 22%, var(--line));
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.99)),
    linear-gradient(135deg, color-mix(in srgb, var(--accent, var(--blue)) 13%, #ffffff), #ffffff);
  padding: 20px;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.06);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.category-card::after {
  position: absolute;
  top: -42px;
  right: -42px;
  width: 86px;
  height: 86px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent, var(--blue)) 13%, transparent);
  content: "";
}

.category-card:hover,
.category-card:focus-within {
  border-color: color-mix(in srgb, var(--accent, var(--blue)) 54%, var(--line));
  box-shadow: 0 20px 44px rgba(15, 23, 42, 0.1);
  transform: translateY(-3px);
}

.category-fun-facts {
  --accent: var(--blue);
}

.category-brain-teasers {
  --accent: var(--violet);
}

.category-science {
  --accent: var(--mint);
}

.category-history {
  --accent: var(--gold);
}

.category-geography {
  --accent: #0f91c8;
}

.category-sports {
  --accent: #e0682f;
}

.category-arts {
  --accent: var(--rose);
}

.category-life-skills {
  --accent: var(--green);
}

.category-icon {
  display: grid;
  width: 64px;
  height: 64px;
  place-items: center;
  position: relative;
  z-index: 1;
  border: 1px solid color-mix(in srgb, var(--accent, var(--blue)) 28%, #b9d3fb);
  border-radius: 24px;
  background:
    linear-gradient(135deg, #ffffff, color-mix(in srgb, var(--accent, var(--blue)) 24%, #ffffff));
  color: color-mix(in srgb, var(--accent, var(--blue)) 82%, #0b1220);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.82), 0 10px 22px color-mix(in srgb, var(--accent, var(--blue)) 12%, transparent);
}

.category-icon svg {
  width: 40px;
  height: 40px;
  fill: currentColor;
  stroke: none;
}

.category-icon .icon-cutout {
  fill: #ffffff;
  opacity: 0.92;
}

.category-card p {
  position: relative;
  z-index: 1;
  margin: 16px 0 0;
  color: color-mix(in srgb, var(--accent, var(--blue)) 80%, #0b1220);
  font-size: 0.82rem;
  font-weight: 800;
}

.category-card h2 {
  position: relative;
  z-index: 1;
  margin: 12px 0 10px;
  font-size: 1.28rem;
  line-height: 1.16;
  letter-spacing: 0;
}

.category-card span,
.intro-panel p,
.result-panel p {
  position: relative;
  z-index: 1;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.62;
}

.category-card button,
.intro-panel button,
.answer-grid button,
.answer-grid a.answer-link,
.result-panel button {
  min-height: 46px;
  border: 0;
  border-radius: 8px;
  background: var(--blue);
  color: #ffffff;
  cursor: pointer;
  font-weight: 900;
}

.category-card button,
.category-card a.category-card-link {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 46px;
  margin-top: 22px;
  border: 0;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent, var(--blue)), color-mix(in srgb, var(--accent, var(--blue)) 62%, #0b1220));
  color: #ffffff;
  cursor: pointer;
  font-weight: 900;
  text-decoration: none;
}

.category-card button:hover,
.category-card a.category-card-link:hover,
.category-card button:focus-visible,
.category-card a.category-card-link:focus-visible {
  background: var(--blue-deep);
  outline: 3px solid rgba(22, 100, 217, 0.18);
}

.action-row a.secondary-link,
a.secondary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: #0b1220;
  font-weight: 900;
  text-decoration: none;
}

.category-grid .category-grid-ad,
.home-categories-bottom .adv {
  grid-column: 1 / -1;
  width: 100%;
  justify-self: center;
}

.category-card button:hover,
.intro-panel button:hover,
.answer-grid button:hover,
.answer-grid a.answer-link:hover,
.result-panel button:hover,
.category-card button:focus-visible,
.intro-panel button:focus-visible,
.answer-grid button:focus-visible,
.answer-grid a.answer-link:focus-visible,
.result-panel button:focus-visible {
  background: var(--blue-deep);
  outline: 3px solid rgba(22, 100, 217, 0.18);
}

.content-layout,
.quiz-layout,
.result-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 24px;
  align-items: start;
}

.intro-panel,
.question-panel,
.result-panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(248, 251, 255, 0.94)),
    #ffffff;
  padding: clamp(24px, 4vw, 42px);
  box-shadow: var(--shadow);
}

.intro-panel::after,
.question-panel::after,
.result-panel::after {
  position: absolute;
  top: -56px;
  right: -56px;
  width: 140px;
  height: 140px;
  border-radius: 999px;
  background: rgba(22, 100, 217, 0.07);
  content: "";
}

.intro-panel h2,
.question-panel h2,
.result-panel h2 {
  margin: 0;
  color: #0b1220;
  font-size: clamp(1.55rem, 3vw, 2.4rem);
  line-height: 1.12;
  letter-spacing: 0;
}

.intro-panel p {
  max-width: 720px;
  margin: 18px 0 0;
}

.category-detail .intro-panel {
  border-color: color-mix(in srgb, var(--accent, var(--blue)) 24%, var(--line));
}

.category-detail .intro-panel::after {
  background: color-mix(in srgb, var(--accent, var(--blue)) 11%, transparent);
}

.detail-main {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.detail-icon {
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--accent, var(--blue)) 30%, #b9d3fb);
  border-radius: 16px;
  background:
    linear-gradient(135deg, #ffffff, color-mix(in srgb, var(--accent, var(--blue)) 24%, #ffffff));
  color: color-mix(in srgb, var(--accent, var(--blue)) 84%, #0b1220);
  box-shadow: 0 8px 16px color-mix(in srgb, var(--accent, var(--blue)) 16%, transparent);
}

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

.detail-icon .icon-cutout {
  fill: #ffffff;
  opacity: 0.92;
}

.knowledge-section {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 0 0 64px;
}

.knowledge-heading {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  width: 100%;
  margin-bottom: 14px;
}

.knowledge-heading h2 {
  margin: 0;
  color: #0b1220;
  font-size: clamp(1.35rem, 2.2vw, 2rem);
  line-height: 42px;
  letter-spacing: 0;
}

.knowledge-heading button {
  grid-column: 3;
  align-self: center;
  justify-self: end;
  min-width: 112px;
  height: 42px;
  border: 1px solid color-mix(in srgb, var(--accent, var(--blue)) 42%, var(--line));
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent, var(--blue)) 12%, #ffffff);
  color: color-mix(in srgb, var(--accent, var(--blue)) 80%, #0b1220);
  font-weight: 900;
}

.knowledge-heading button:hover,
.knowledge-heading button:focus-visible {
  background: color-mix(in srgb, var(--accent, var(--blue)) 20%, #ffffff);
}

.knowledge-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.knowledge-grid .warmup-grid-ad {
  width: 100%;
  margin: 4px 0;
}

.warmup-card {
  position: relative;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--accent, var(--blue)) 18%, var(--line));
  border-radius: 8px;
  background:
    linear-gradient(135deg, #ffffff, color-mix(in srgb, var(--accent, var(--blue)) 9%, #ffffff));
  padding: 20px;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.05);
}

.warmup-card::after {
  position: absolute;
  right: -28px;
  bottom: -28px;
  width: 78px;
  height: 78px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent, var(--blue)) 10%, transparent);
  content: "";
}

.warmup-card summary {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr) max-content;
  gap: 18px;
  align-items: center;
  cursor: pointer;
  list-style: none;
}

.warmup-card summary::-webkit-details-marker {
  display: none;
}

.warmup-icon {
  position: relative;
  z-index: 1;
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 18px;
  background: color-mix(in srgb, var(--accent, var(--blue)) 18%, #ffffff);
  color: color-mix(in srgb, var(--accent, var(--blue)) 84%, #0b1220);
}

.warmup-question {
  min-width: 0;
}

.warmup-question small {
  display: block;
  margin-bottom: 5px;
  color: color-mix(in srgb, var(--accent, var(--blue)) 74%, #0b1220);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.warmup-question strong {
  display: block;
  color: #0b1220;
  font-size: 1.02rem;
  line-height: 1.34;
}

.warmup-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  justify-self: end;
  min-width: 104px;
  border: 1px solid color-mix(in srgb, var(--accent, var(--blue)) 22%, var(--line));
  border-radius: 999px;
  background: #ffffff;
  padding: 9px 14px;
  color: color-mix(in srgb, var(--accent, var(--blue)) 76%, #0b1220);
  font-size: 0.78rem;
  font-weight: 900;
  white-space: nowrap;
}

.warmup-card[open] .warmup-toggle {
  background: color-mix(in srgb, var(--accent, var(--blue)) 14%, #ffffff);
}

.warmup-answer {
  position: relative;
  z-index: 1;
  margin-top: 16px;
  border-top: 1px solid color-mix(in srgb, var(--accent, var(--blue)) 14%, var(--line));
  padding-top: 16px;
}

.knowledge-grid h3 {
  position: relative;
  z-index: 1;
  margin: 16px 0 0;
  color: #0b1220;
  font-size: 1.05rem;
  line-height: 1.32;
  letter-spacing: 0;
}

.preview-answer {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  border: 1px solid color-mix(in srgb, var(--accent, var(--blue)) 24%, var(--line));
  border-radius: 8px;
  background: color-mix(in srgb, var(--accent, var(--blue)) 8%, #ffffff);
  padding: 12px;
}

.preview-answer small,
.knowledge-grid p small {
  display: block;
  color: color-mix(in srgb, var(--accent, var(--blue)) 80%, #0b1220);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.preview-answer strong {
  color: #0b1220;
  font-size: 0.98rem;
  text-align: right;
}

.knowledge-grid svg {
  width: 38px;
  height: 38px;
  fill: currentColor;
  stroke: none;
}

.knowledge-grid .icon-cutout {
  fill: #ffffff;
  opacity: 0.92;
}

.knowledge-grid p {
  position: relative;
  z-index: 1;
  margin: 16px 0 0;
  color: #183152;
  font-weight: 650;
  line-height: 1.58;
}

.knowledge-grid p small {
  margin-bottom: 8px;
}

.detail-actions button:first-child {
  background: linear-gradient(135deg, var(--accent, var(--blue)), color-mix(in srgb, var(--accent, var(--blue)) 62%, #0b1220));
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.action-row button {
  min-width: 150px;
  padding: 0 20px;
}

.action-row .secondary {
  border: 1px solid var(--line);
  background: #ffffff;
  color: #0b1220;
}

.action-row .secondary:hover,
.action-row .secondary:focus-visible {
  border-color: var(--blue);
  background: var(--blue-soft);
  color: var(--blue-deep);
}

.action-row .category-back,
.action-row .page-back {
  position: relative;
  min-width: 176px;
  min-height: 54px;
  padding: 0 28px;
  border: 2px solid color-mix(in srgb, var(--accent, var(--blue)) 68%, var(--blue));
  background: #ffffff;
  color: color-mix(in srgb, var(--accent, var(--blue)) 78%, #0b1220);
  font-size: 1.02rem;
  font-weight: 850;
  box-shadow: 0 10px 22px color-mix(in srgb, var(--accent, var(--blue)) 14%, transparent);
}

.action-row .category-back::before,
.action-row .page-back::before {
  content: "<";
  margin-right: 10px;
  font-size: 1.1rem;
  font-weight: 900;
}

.action-row .category-back:hover,
.action-row .category-back:focus-visible,
.action-row .page-back:hover,
.action-row .page-back:focus-visible {
  background: color-mix(in srgb, var(--accent, var(--blue)) 12%, #ffffff);
  box-shadow: 0 14px 28px color-mix(in srgb, var(--accent, var(--blue)) 20%, transparent);
}

.progress-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 800;
}

.progress-track {
  height: 10px;
  margin: 14px 0 34px;
  overflow: hidden;
  border-radius: 999px;
  background: #edf2f8;
}

.progress-track span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue), var(--green));
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 30px;
}

.answer-grid button,
.answer-grid a.answer-link {
  display: flex;
  min-height: 130px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 22px;
  text-align: left;
  text-decoration: none;
  background: linear-gradient(135deg, var(--blue), #1885d6);
  box-shadow: 0 12px 26px rgba(22, 100, 217, 0.17);
  font-size: 1.25rem;
  line-height: 1.2;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.answer-grid button:hover,
.answer-grid button:focus-visible,
.answer-grid a.answer-link:hover,
.answer-grid a.answer-link:focus-visible {
  box-shadow: 0 18px 34px rgba(22, 100, 217, 0.24);
  transform: translateY(-2px);
}

.answer-grid small {
  margin-bottom: 10px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-panel strong {
  display: block;
  margin: 8px 0 10px;
  color: var(--blue);
  font-size: clamp(4rem, 10vw, 7.5rem);
  line-height: 0.9;
}

.result-panel h2 {
  color: #0b1220;
  font-size: clamp(1.3rem, 2.4vw, 2rem);
}

.result-panel p {
  max-width: 620px;
  margin: 18px 0 0;
  font-size: 1.06rem;
}

.review-section {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding: 4px 0 64px;
}

.review-section .category-heading {
  width: 100%;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.review-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  padding: 20px;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.06);
}

.review-card.is-correct {
  border-color: rgba(17, 133, 91, 0.26);
}

.review-card.is-wrong {
  border-color: rgba(223, 93, 120, 0.26);
}

.review-card.is-missing {
  border-color: rgba(83, 97, 113, 0.2);
}

.review-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.review-topline span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.review-topline strong {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--blue-deep);
  font-size: 1rem;
}

.review-card.is-correct .review-topline strong {
  background: rgba(17, 133, 91, 0.12);
  color: var(--green);
}

.review-card.is-wrong .review-topline strong {
  background: rgba(223, 93, 120, 0.12);
  color: var(--rose);
}

.review-card.is-missing .review-topline strong {
  background: rgba(83, 97, 113, 0.1);
  color: var(--muted);
}

.review-card h3 {
  margin: 0;
  color: #0b1220;
  font-size: 1.18rem;
  line-height: 1.28;
  letter-spacing: 0;
}

.answer-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 18px;
}

.answer-summary p,
.explanation-box p {
  margin: 0;
}

.answer-summary p {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbff;
  padding: 12px;
}

.answer-summary small,
.explanation-box small {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.answer-summary span {
  color: #0b1220;
  font-weight: 850;
}

.explanation-box {
  margin-top: 12px;
  border: 1px solid rgba(22, 100, 217, 0.18);
  border-radius: 8px;
  background: linear-gradient(135deg, #ffffff, #f8fbff);
  padding: 14px;
}

.explanation-box p {
  color: var(--muted);
  line-height: 1.55;
}

.info-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 24px;
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  padding-bottom: 64px;
}

.info-layout-simple {
  grid-template-columns: 1fr;
}

.info-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  padding: clamp(22px, 4vw, 36px);
  box-shadow: var(--shadow);
}

.info-panel > p {
  max-width: 780px;
  margin: 0;
  color: #183152;
  font-size: 1.08rem;
  line-height: 1.7;
}

.info-panel ul {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.info-panel li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  border: 1px solid rgba(22, 100, 217, 0.14);
  border-radius: 8px;
  background: #f8fbff;
  padding: 14px;
}

.info-panel li span {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 16px;
  background: var(--blue-soft);
  color: var(--blue);
}

.info-panel li svg {
  width: 26px;
  height: 26px;
  fill: currentColor;
}

.info-panel li .icon-cutout {
  fill: #ffffff;
}

.info-panel li p {
  margin: 0;
  color: #0b1220;
  line-height: 1.55;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
  border-top: 1px solid var(--line);
  padding: 36px 0 46px;
}

.site-footer nav {
  display: grid;
  grid-template-columns: repeat(3, max-content);
  justify-content: center;
  gap: 12px 14px;
  align-items: center;
  text-align: center;
}

.site-footer nav button,
.site-footer nav a:not(.footer-email) {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #ffffff;
  padding: 10px 16px;
  color: #0b1220;
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 850;
  text-decoration: none;
}

.site-footer nav button:hover,
.site-footer nav button:focus-visible,
.site-footer nav a:not(.footer-email):hover,
.site-footer nav a:not(.footer-email):focus-visible {
  border-color: var(--blue);
  background: var(--blue-soft);
  color: var(--blue-deep);
}

.footer-email {
  grid-column: 1 / -1;
  justify-self: center;
  margin-top: 8px;
  color: #0b1220;
  font-size: 0.92rem;
  font-weight: 850;
  text-decoration: none;
  white-space: nowrap;
}

.footer-email:hover,
.footer-email:focus-visible {
  color: var(--blue-deep);
}

@media (max-width: 960px) {
  .topbar {
    padding: 0 24px;
  }

  .hero-band,
  .review-grid,
  .content-layout,
  .quiz-layout,
  .result-layout,
  .info-layout {
    grid-template-columns: 1fr;
  }

  .category-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (max-width: 640px) {
  .topbar {
    min-height: 62px;
    padding: 0 16px;
  }

  .brand {
    font-size: 0.95rem;
  }

  .topbar nav button {
    min-height: 38px;
    padding: 0 10px;
    font-size: 0.9rem;
  }

  .category-menu summary {
    min-height: 38px;
    padding: 0 10px;
    font-size: 0.9rem;
  }

  .topbar nav {
    gap: 8px;
  }

  .category-menu-panel {
    right: -54px;
    width: min(300px, calc(100vw - 24px));
    grid-template-columns: 1fr;
  }

  .hero-band,
  .category-heading,
  .category-grid,
  .knowledge-section,
  .review-section,
  .info-layout,
  .site-footer,
  .content-layout,
  .quiz-layout,
  .result-layout {
    width: min(100% - 28px, 1160px);
  }

  .hero-band {
    padding-top: 22px;
    padding-bottom: 14px;
  }

  .hero-band h1 {
    font-size: clamp(1.55rem, 8vw, 2.2rem);
  }

  .category-grid,
  .answer-summary,
  .answer-grid {
    grid-template-columns: 1fr;
  }

  .category-heading {
    padding-bottom: 10px;
  }

  .category-card {
    min-height: 210px;
    padding: 20px;
  }

  .category-card button {
    margin-top: 18px;
  }

  .detail-main,
  .knowledge-grid {
    grid-template-columns: 1fr;
  }

  .knowledge-heading {
    align-items: center;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 10px;
  }

  .knowledge-heading button {
    grid-column: 3;
    align-self: center;
    justify-self: end;
    min-width: 92px;
    height: 38px;
    font-size: 0.86rem;
  }

  .knowledge-heading h2 {
    line-height: 38px;
  }

  .warmup-card summary {
    grid-template-columns: 150px minmax(0, 1fr) max-content;
    gap: 12px;
  }

  .warmup-toggle {
    grid-column: 3;
    min-width: 88px;
    padding: 8px 10px;
  }

  .detail-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
  }

  .detail-icon svg {
    width: 28px;
    height: 28px;
  }

  .progress-row {
    flex-direction: column;
  }

  .answer-grid button,
  .answer-grid a.answer-link {
    min-height: 104px;
  }

  .action-row button {
    width: 100%;
  }

  .site-footer {
    padding: 30px 0 38px;
  }

  .site-footer nav {
    grid-template-columns: repeat(3, minmax(0, max-content));
    gap: 10px;
    justify-content: center;
  }

  .footer-email {
    justify-self: center;
    margin-top: 6px;
    white-space: normal;
  }

  .info-panel li {
    grid-template-columns: 36px minmax(0, 1fr);
  }

  .info-panel li span {
    width: 36px;
    height: 36px;
    border-radius: 14px;
  }
}