:root {
  --bg: #0E1318;
  --bg-2: #121920;
  --surface: #172029;
  --surface-2: #1E2933;
  --line: rgba(226, 234, 242, 0.09);
  --line-strong: rgba(226, 234, 242, 0.18);
  --fg: #E9EEF3;
  --fg-2: #BCC6D0;
  --muted: #8794A2;
  --steel: #9FC3E3;
  --steel-ink: #6E95B8;
  --invert-bg: #E9EEF3;
  --invert-fg: #0E1318;
  --accent: #62B0F0;
  --accent-soft: rgba(98, 176, 240, 0.13);
  --ok: var(--accent);
  --ok-soft: var(--accent-soft);
  --right: #3FD27A;
  --right-soft: rgba(63, 210, 122, 0.12);
  --scrim: rgba(14, 19, 24, 0.82);
  --mark-ink: #B7C5D3;
  --stage-top: #16202A;
  --stage-bottom: #0E141A;
  --stage-dot: rgba(226, 234, 242, 0.06);
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme=dark]) {
    --bg: #EEF1F4;
    --bg-2: #E4E9EE;
    --surface: #FFFFFF;
    --surface-2: #F3F6F9;
    --line: rgba(16, 26, 36, 0.10);
    --line-strong: rgba(16, 26, 36, 0.2);
    --fg: #111A23;
    --fg-2: #33404D;
    --muted: #5F6D7B;
    --steel: #2F5878;
    --steel-ink: #2F5878;
    --invert-bg: #111A23;
    --invert-fg: #EEF1F4;
    --accent: #1C5FA8;
    --accent-soft: rgba(28, 95, 168, 0.09);
    --ok: var(--accent);
    --ok-soft: var(--accent-soft);
    --right: #0A783B;
    --right-soft: rgba(14, 138, 68, 0.10);
    --scrim: rgba(238, 241, 244, 0.86);
    --mark-ink: #22303D;
    --stage-top: #E5EAF0;
    --stage-bottom: #D7DFE7;
    --stage-dot: rgba(16, 26, 36, 0.07);
  }
}
:root[data-theme=light] {
  --bg: #EEF1F4;
  --bg-2: #E4E9EE;
  --surface: #FFFFFF;
  --surface-2: #F3F6F9;
  --line: rgba(16, 26, 36, 0.10);
  --line-strong: rgba(16, 26, 36, 0.2);
  --fg: #111A23;
  --fg-2: #33404D;
  --muted: #5F6D7B;
  --steel: #2F5878;
  --steel-ink: #2F5878;
  --invert-bg: #111A23;
  --invert-fg: #EEF1F4;
  --accent: #1C5FA8;
  --accent-soft: rgba(28, 95, 168, 0.09);
  --ok: var(--accent);
  --ok-soft: var(--accent-soft);
  --right: #0A783B;
  --right-soft: rgba(14, 138, 68, 0.10);
  --scrim: rgba(238, 241, 244, 0.86);
  --mark-ink: #22303D;
  --stage-top: #E5EAF0;
  --stage-bottom: #D7DFE7;
  --stage-dot: rgba(16, 26, 36, 0.07);
}
.brand-mark-737 {
  width: 34px;
  height: 34px;
  transition: transform .5s var(--ease-out);
}
.brand:hover .brand-mark-737,
.brand:focus-visible .brand-mark-737 {
  transform: translateY(-2px);
}
.site-header .brand-mark-737 {
  width: 30px;
  height: 30px;
}
@media (min-width: 900px) {
  .site-header .brand-mark-737 {
    width: 32px;
    height: 32px;
  }
}
.footer-brand .brand-mark-737 {
  width: 34px;
  height: 34px;
}
.opt.is-correct {
  border-color: var(--right);
  background: var(--right-soft);
}
.opt.is-correct .key {
  border-color: var(--right);
  color: var(--right);
}
.opt.is-correct .verdict,
.chip-ok {
  color: var(--right);
}
.chip-ok {
  border-color: color-mix(in srgb, var(--right) 40%, transparent);
}
.qwhy {
  border-left-color: var(--accent);
}
.qwhy-k {
  color: var(--accent);
}
.hero {
  background: #0A0F14;
}
.hero::before {
  background:
    radial-gradient(
      120% 85% at 50% 40%,
      rgba(8, 12, 16, 0.80) 0%,
      rgba(8, 12, 16, 0.60) 55%,
      rgba(8, 12, 16, 0.88) 100%),
    linear-gradient(
      0deg,
      rgba(8, 12, 16, 0.95) 0%,
      rgba(8, 12, 16, 0) 40%);
}
.hero-home .hero-photo {
  background: #0A0F14;
}
.hero-home .hero-photo img {
  filter: saturate(0.95) contrast(1.06);
  object-position: 60% 55%;
}
.hero-home .hero-photo::after {
  background:
    radial-gradient(
      48% 44% at 26% 42%,
      rgba(98, 176, 240, 0.10),
      transparent 70%),
    linear-gradient(
      90deg,
      rgba(8, 12, 16, 0.92) 0%,
      rgba(8, 12, 16, 0.76) 40%,
      rgba(8, 12, 16, 0.44) 72%,
      rgba(8, 12, 16, 0.60) 100%),
    linear-gradient(
      0deg,
      rgba(8, 12, 16, 0.95) 0%,
      rgba(8, 12, 16, 0) 42%);
}
.k-hero-k {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: clamp(18px, 2vw, 26px);
  color: #9CCBF2;
}
.k-hero-k::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: .8;
}
.hero-q {
  --ok: #62B0F0;
  --ok-soft: rgba(98,176,240,0.13);
  --right: #3FD27A;
  --right-soft: rgba(63,210,122,0.13);
  --surface: rgba(22,30,38,0.72);
}
.hero-q .qcard {
  background:
    linear-gradient(
      180deg,
      rgba(24, 33, 42, 0.84),
      rgba(12, 17, 22, 0.9));
  box-shadow:
    0 40px 80px -40px rgba(0, 0, 0, 0.9),
    0 0 60px -20px rgba(98, 176, 240, 0.14),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.hero-q .qcard-top .eyebrow {
  color: #9CCBF2;
}
.figure .fig-n .fig-v {
  font-variant-numeric: tabular-nums;
}
.k-growing,
.qb-grow {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.k-growing {
  margin-top: clamp(20px, 3vw, 32px);
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  max-width: 760px;
}
.k-growing p,
.qb-grow p {
  margin: 0;
  color: var(--fg-2);
  font-size: 0.9375rem;
  line-height: 1.6;
}
.k-growing b,
.qb-grow b {
  color: var(--fg);
}
.k-growing-dot {
  flex: none;
  width: 9px;
  height: 9px;
  margin-top: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 50%, transparent);
  animation: k-pulse 2.4s ease-in-out infinite;
}
@keyframes k-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 45%, transparent);
  }
  50% {
    box-shadow: 0 0 0 7px transparent;
  }
}
@media (prefers-reduced-motion: reduce) {
  .k-growing-dot {
    animation: none;
  }
}
.tools-sec .tools {
  grid-template-columns: 1fr;
}
.k-coming .tools-head {
  align-items: end;
}
.k-soon {
  list-style: none;
  margin: clamp(24px, 3vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
@media (max-width: 1100px) {
  .k-soon {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 600px) {
  .k-soon {
    grid-template-columns: 1fr;
  }
}
.k-soon-card {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}
.k-soon-img {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #0A0F14;
}
.k-soon-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) brightness(0.72);
  transform: scale(1.02);
  transition: transform 1.2s var(--ease-out), filter .6s ease;
}
.k-soon-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      180deg,
      transparent 40%,
      rgba(8, 12, 16, 0.55));
}
.k-soon-card:hover .k-soon-img img {
  transform: scale(1.06);
  filter: saturate(0.85) brightness(0.8);
}
.k-soon-body {
  padding: 18px 20px 22px;
  display: grid;
  gap: 8px;
  align-content: start;
}
.k-soon-body p {
  margin: 0;
  color: var(--fg-2);
  font-size: 0.9063rem;
  line-height: 1.6;
}
.k-soon-tag {
  justify-self: start;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  border-radius: 999px;
  padding: 4px 10px;
}
.k-coming-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  margin-top: clamp(24px, 3vw, 36px);
}
.k-coming-cta p {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
  max-width: 52ch;
}
.k-sister-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 6px);
  overflow: hidden;
  background: var(--surface);
}
@media (max-width: 899px) {
  .k-sister-card {
    grid-template-columns: 1fr;
  }
}
.k-sister-photo {
  min-height: 260px;
  background: #0A0F14;
}
.k-sister-photo img,
.k-sister-photo picture {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.k-sister-copy {
  padding: clamp(28px, 4vw, 56px);
  display: grid;
  gap: 16px;
  align-content: center;
  justify-items: start;
}
.k-sister-copy p {
  margin: 0;
  color: var(--fg-2);
  line-height: 1.7;
  max-width: 52ch;
}
.k-sister-copy a.sister,
.ab-story-copy a.sister,
.prose a.sister {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 60%, transparent);
  text-underline-offset: 0.2em;
}
.k-end {
  border-top: 1px solid var(--line);
}
.k-end-in {
  display: grid;
  gap: 18px;
  justify-items: center;
  text-align: center;
}
.k-end-in .lede {
  margin: 0 auto;
}
.footer-sister {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  margin-top: 18px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  color: var(--fg-2);
  font-size: 0.8125rem;
  transition: border-color .25s ease, color .25s ease;
}
.footer-sister b {
  font-weight: 600;
  color: var(--fg);
}
.footer-sister:hover,
.footer-sister:focus-visible {
  border-color: color-mix(in srgb, var(--accent) 50%, transparent);
  color: var(--fg);
}
.k-page-hero .hero-photo img {
  object-position: 50% 45%;
  filter: saturate(0.85) contrast(1.05) brightness(0.9);
}
.k-page-hero-in {
  padding-block: clamp(56px, 8vw, 104px) clamp(40px, 5vw, 64px);
}
.k-page-title {
  margin: 0;
  max-width: 16ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.25rem, 1.2rem + 3.2vw, 3.75rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: #FFFFFF;
  text-wrap: balance;
}
.k-page-title span {
  display: block;
  margin-top: 0.16em;
  color: rgba(242, 243, 245, 0.55);
}
.k-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 40px;
  margin: clamp(28px, 3vw, 40px) 0 0;
  padding-top: 22px;
  border-top: 1px solid rgba(242, 243, 245, 0.14);
  max-width: 620px;
}
.k-stats div {
  display: grid;
  gap: 4px;
}
.k-stats dt {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(242, 243, 245, 0.6);
}
.k-stats dd {
  margin: 0;
  font-size: 1.375rem;
  font-weight: 700;
  color: #FFFFFF;
  font-variant-numeric: tabular-nums;
}
.qb-wrap {
  padding-block: clamp(28px, 4vw, 56px) clamp(64px, 8vw, 104px);
}
.qb-setup {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}
@media (max-width: 899px) {
  .qb-setup {
    grid-template-columns: 1fr;
  }
}
.qb-panel {
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  background: var(--surface);
  padding: clamp(22px, 3vw, 36px);
}
.qb-sub {
  margin: 8px 0 0;
  font-size: 0.9375rem;
}
.qb-lab {
  margin: 26px 0 10px;
}
.qb-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.qb-chips .chip-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.qb-chips .chip-btn[aria-pressed=true] {
  background: var(--accent);
  border-color: var(--accent);
  color: #FFFFFF;
}
:root:not([data-theme=light]) .qb-chips .chip-btn[aria-pressed=true] {
  color: #0A1018;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme=dark]) .qb-chips .chip-btn[aria-pressed=true] {
    color: #FFFFFF;
  }
}
.qb-setup > *,
.qb-panel {
  min-width: 0;
}
@media (max-width: 640px) {
  #qb-topics {
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    scroll-snap-type: x proximity;
    margin-inline: -4px;
    padding: 2px 28px 6px 4px;
    -webkit-mask-image:
      linear-gradient(
        90deg,
        #000 85%,
        transparent);
    mask-image:
      linear-gradient(
        90deg,
        #000 85%,
        transparent);
  }
  #qb-topics::-webkit-scrollbar {
    display: none;
  }
  #qb-topics .chip-btn {
    flex: none;
    scroll-snap-align: start;
  }
}
.qb-n {
  font-size: 0.75rem;
  opacity: 0.7;
  font-variant-numeric: tabular-nums;
}
.qb-chips .chip-btn[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
}
.qb-go-row {
  margin-top: 30px;
}
.qb-side {
  display: grid;
  gap: 22px;
}
.qb-lock {
  display: grid;
  gap: 10px;
  justify-items: start;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.qb-lock .eyebrow {
  color: var(--accent);
}
.qb-lock p {
  margin: 0;
  color: var(--fg-2);
  line-height: 1.6;
}
.qb-lock b {
  color: var(--fg);
}
.qb-fine {
  margin: 0;
  color: var(--muted);
  font-size: 0.8125rem;
  line-height: 1.6;
}
.qb-play {
  max-width: 820px;
  margin: 0 auto;
}
.qb-play-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.qb-bar {
  height: 3px;
  border-radius: 3px;
  background: var(--line);
  overflow: hidden;
  margin-bottom: 18px;
}
.qb-bar i {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  border-radius: inherit;
  transition: width .5s var(--ease-out);
}
.qb-card {
  padding: clamp(20px, 3vw, 34px);
}
.qb-done {
  max-width: 820px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
}
.qb-done:focus {
  outline: none;
}
.qb-done .h2 {
  font-size: clamp(3rem, 2rem + 4vw, 4.5rem);
  line-height: 1;
  color: var(--accent);
  margin: 4px 0;
}
.qb-missed {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: grid;
  gap: 10px;
}
.qb-missed li {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-2);
}
.qb-missed b {
  font-weight: 600;
}
.qb-missed span {
  color: var(--right);
  font-weight: 600;
  font-size: 0.9375rem;
}
.qb-missed small {
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}
.k-empty-sec {
  padding-top: clamp(40px, 6vw, 72px);
}
.k-empty {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
  display: grid;
  gap: 16px;
  justify-items: center;
  padding: clamp(32px, 5vw, 56px) clamp(20px, 4vw, 48px);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 8px);
  background:
    radial-gradient(
      120% 120% at 50% 0%,
      color-mix(in srgb, var(--accent) 7%, var(--surface)) 0%,
      var(--surface) 60%);
}
.k-empty .h2 {
  margin: 0;
  text-wrap: balance;
}
.k-empty .lede {
  margin: 0 auto;
}
.k-empty-ic {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.k-empty-ic svg {
  width: 28px;
  height: 28px;
}
.k-empty-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  text-align: left;
  width: 100%;
}
@media (max-width: 640px) {
  .k-empty-list {
    grid-template-columns: 1fr;
  }
}
.k-empty-list li {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
.k-empty-list span {
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.5;
}
.k-empty-cta {
  justify-content: center;
  margin-top: 8px;
}
.k-empty-fine {
  margin: 0;
  color: var(--muted);
  font-size: 0.8125rem;
}
.k-page-hero .hero-photo::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(
      90deg,
      rgba(8, 12, 16, 0.94) 0%,
      rgba(8, 12, 16, 0.82) 45%,
      rgba(8, 12, 16, 0.55) 100%),
    linear-gradient(
      0deg,
      rgba(8, 12, 16, 0.9) 0%,
      rgba(8, 12, 16, 0) 50%);
}
.pr-hero-photo img {
  filter: saturate(0.8) contrast(1.04) brightness(0.6);
}
.pr-hero-photo::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(
      60% 70% at 50% 40%,
      rgba(8, 12, 16, 0.72),
      rgba(8, 12, 16, 0.35) 70%,
      transparent);
}
.faq-hero-photo img {
  filter: saturate(0.8) brightness(0.7);
}
.pr-tr,
.pr-tr-link,
.pr-head {
  --instr: var(--accent);
  --instr-soft: var(--accent-soft);
}
.pr-head .pr-tr-link {
  --instr: #9CCBF2;
}