:root {
  --edu-ink: var(--ink, #18191a);
  --edu-charcoal: var(--charcoal, #151515);
  --edu-console: var(--console, #252523);
  --edu-paper: var(--paper, #f4efe6);
  --edu-paper-bright: var(--paper-soft, #fffaf1);
  --edu-amber: var(--amber, #d89d4a);
  --edu-amber-bright: var(--amber-bright, #f1bd68);
  --edu-muted: var(--muted, #766e64);
  --edu-line-dark: rgba(255, 250, 241, 0.14);
  --edu-line-light: rgba(24, 25, 26, 0.1);
  --edu-display: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --edu-body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color-scheme: light dark;
  font-family: var(--edu-body);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  overflow-x: clip;
  color: var(--edu-ink);
  background: var(--edu-paper);
}

body::selection {
  color: var(--edu-charcoal);
  background: var(--edu-amber-bright);
}

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

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

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  width: 100%;
}

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

h1,
h2,
h3,
.eyebrow,
.edu-button,
.text-button,
.proof-grid strong,
.proof-grid span,
.step-number,
.loop-index,
.audience-label,
.value-comparison span,
.process-list span {
  font-family: var(--edu-display);
  font-stretch: normal;
}

h1,
h2 {
  letter-spacing: 0;
}

h2 {
  margin-bottom: 22px;
  font-size: clamp(2.1rem, 5vw, 4.7rem);
  line-height: 0.95;
}

h3 {
  letter-spacing: 0;
}

p {
  line-height: 1.65;
}

.page-width {
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}

.eyebrow {
  margin-bottom: 16px;
  color: var(--edu-amber-bright);
  font-size: 0.78rem;
  font-weight: 780;
  letter-spacing: 0;
  line-height: 1.35;
  text-transform: uppercase;
}

.edu-hero {
  position: relative;
  display: grid;
  min-height: 88svh;
  align-items: center;
  overflow: hidden;
  background: var(--edu-charcoal);
  color: var(--edu-paper-bright);
}

.hero-image,
.hero-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-image {
  object-fit: cover;
  object-position: center;
  filter: none;
}

.hero-overlay {
  background:
    linear-gradient(180deg, rgba(0, 0, 0, 0.32), transparent 42%, rgba(0, 0, 0, 0.56)),
    linear-gradient(90deg, rgba(15, 15, 14, 0.88), rgba(15, 15, 14, 0.18) 60%, rgba(15, 15, 14, 0.72));
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-top: 120px;
  padding-bottom: 76px;
}

.hero-content h1 {
  max-width: 980px;
  margin-bottom: 26px;
  color: var(--edu-paper-bright);
  font-size: clamp(3rem, 5.9vw, 5.8rem);
  line-height: 0.92;
  text-wrap: balance;
}

.hero-copy {
  max-width: 660px;
  margin-bottom: 0;
  color: rgba(255, 250, 241, 0.84);
  font-size: clamp(1rem, 1.8vw, 1.24rem);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 36px;
}

.edu-button,
.text-button {
  cursor: pointer;
}

.edu-button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 760;
  letter-spacing: 0;
  padding: 13px 20px;
  transition: transform 180ms ease, background-color 180ms ease, color 180ms ease, box-shadow 180ms ease;
}

.edu-button:hover,
.edu-button:focus-visible {
  transform: translateY(-2px);
}

.edu-button.primary {
  background: var(--edu-amber-bright);
  color: #1a1610;
  box-shadow: 0 14px 34px rgba(241, 189, 104, 0.18);
}

.edu-button.primary:hover,
.edu-button.primary:focus-visible {
  background: #ffd084;
}

.edu-button.secondary {
  border-color: rgba(255, 250, 241, 0.36);
  background: rgba(255, 250, 241, 0.12);
  color: var(--edu-paper-bright);
}

.edu-button.secondary:hover,
.edu-button.secondary:focus-visible {
  border-color: rgba(255, 250, 241, 0.52);
  background: rgba(255, 250, 241, 0.18);
  color: var(--edu-paper-bright);
}

.edu-button.secondary.dark {
  border-color: var(--edu-line-light);
  background: transparent;
  color: var(--edu-ink);
}

.edu-button.secondary.dark:hover,
.edu-button.secondary.dark:focus-visible {
  background: var(--edu-ink);
  color: var(--edu-paper-bright);
}

.proof-strip {
  background: var(--edu-paper);
  color: var(--edu-ink);
  padding: clamp(12px, 1.4vw, 18px);
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(12px, 0.95vw, 16px);
}

.proof-grid div {
  display: grid;
  min-height: 126px;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: center;
  border: 1px solid rgba(24, 25, 26, 0.08);
  border-radius: var(--radius);
  background: rgba(255, 250, 241, 0.7);
  padding: 24px 22px;
  box-shadow: 0 10px 24px rgba(40, 30, 20, 0.06);
}

.proof-grid div:first-child {
  border-left: 1px solid rgba(24, 25, 26, 0.08);
}

.proof-grid strong {
  color: var(--oxide);
  font-size: 1.6rem;
}

.proof-grid span {
  color: var(--edu-muted);
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0;
  line-height: 1.3;
}

.dark-section,
.paper-section {
  padding-block: clamp(82px, 10vw, 142px);
}

.dark-section {
  background:
    linear-gradient(180deg, rgba(24, 24, 22, 0.94), rgba(24, 24, 22, 0.98)),
    url("../images/offer-stage.png") center / cover fixed;
  color: var(--edu-paper-bright);
}

.paper-section {
  background: linear-gradient(180deg, var(--edu-paper), var(--edu-paper-bright) 56%, var(--edu-paper));
}

.section-lead {
  max-width: 760px;
}

.section-lead > p:last-child,
.section-heading > p:last-child {
  color: var(--edu-muted);
}

.dark-section .section-lead > p:last-child,
.dark-section .section-heading > p:last-child {
  color: rgba(255, 250, 241, 0.62);
}

.split-lead {
  display: grid;
  max-width: none;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: clamp(44px, 8vw, 116px);
  align-items: end;
}

.split-lead > p {
  max-width: 520px;
  margin-bottom: 18px;
}

.section-heading.centered {
  display: block;
  max-width: 840px;
  margin-inline: auto;
  text-align: center;
}

.process .section-heading.centered {
  max-width: 1120px;
}

.reality-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 72px;
  border-top: 1px solid var(--edu-line-dark);
  border-bottom: 1px solid var(--edu-line-dark);
}

.reality-grid article {
  min-height: 300px;
  border-right: 1px solid var(--edu-line-dark);
  padding: 32px 34px;
}

.reality-grid article:first-child {
  border-left: 1px solid var(--edu-line-dark);
}

.reality-grid h3 {
  margin: 44px 0 14px;
  font-size: clamp(1.15rem, 1.8vw, 1.55rem);
  line-height: 1.2;
}

.reality-grid p {
  margin-bottom: 0;
  color: rgba(255, 250, 241, 0.58);
  font-size: 0.92rem;
}

.step-number,
.loop-index {
  color: var(--edu-amber-bright);
  font-weight: 900;
}

.step-number {
  font-size: 1rem;
  letter-spacing: 0.12em;
}

.learning-loop .section-heading {
  margin-bottom: 62px;
}

.loop-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.loop-step {
  position: relative;
  border-right: 1px solid var(--edu-line-light);
  border-radius: var(--radius);
  background: rgba(255, 250, 241, 0.46);
  padding: 26px 26px 34px;
  box-shadow: 0 20px 54px rgba(64, 52, 33, 0.08);
}

.loop-step:first-child {
  border-left: 0;
}

.loop-step.featured {
  background: var(--edu-paper-bright);
}

.loop-index {
  margin-bottom: 18px;
  font-size: 3.4rem;
  line-height: 1;
}

.loop-step img {
  height: 215px;
  margin-bottom: 28px;
  object-fit: cover;
  filter: saturate(0.74) contrast(1.05);
}

.loop-step h3 {
  margin-bottom: 14px;
  font-size: clamp(1.25rem, 1.8vw, 1.65rem);
  line-height: 1.2;
}

.loop-step > p:not(.eyebrow) {
  min-height: 100px;
  color: var(--edu-muted);
  font-size: 0.91rem;
}

.loop-step .eyebrow {
  color: var(--edu-muted);
  font-size: 0.69rem;
}

.text-button {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  border: 1px solid var(--edu-line-light);
  border-radius: 999px;
  background: transparent;
  color: var(--edu-ink);
  font-size: 0.82rem;
  font-weight: 760;
  letter-spacing: 0;
  padding: 0 16px;
  transition: background-color 160ms ease, color 160ms ease;
}

.text-button:hover,
.text-button:focus-visible {
  background: var(--edu-ink);
  color: var(--edu-paper-bright);
}

.text-button.light {
  border-color: var(--edu-line-dark);
  color: var(--edu-paper-bright);
}

.text-button.light:hover,
.text-button.light:focus-visible {
  background: var(--edu-paper-bright);
  color: var(--edu-charcoal);
}

.outcomes-layout {
  display: grid;
  grid-template-columns: minmax(300px, 0.86fr) minmax(0, 1.14fr);
  gap: clamp(50px, 8vw, 120px);
}

.outcomes-copy h2 {
  font-size: clamp(2.1rem, 5vw, 4.7rem);
}

.outcomes-copy ul {
  margin: 34px 0 0;
  color: rgba(255, 250, 241, 0.72);
  padding-left: 1.2em;
}

.outcomes-copy li {
  margin-bottom: 11px;
  line-height: 1.45;
}

.audience-grid {
  display: grid;
  border-top: 1px solid var(--edu-line-dark);
}

.audience-grid article {
  border-bottom: 1px solid var(--edu-line-dark);
  padding: 26px 0 28px;
}

.audience-grid h3 {
  margin-bottom: 10px;
  font-size: clamp(1.25rem, 1.8vw, 1.7rem);
  line-height: 1.2;
}

.audience-grid p:last-child {
  max-width: 540px;
  margin-bottom: 0;
  color: rgba(255, 250, 241, 0.56);
}

.audience-label {
  margin-bottom: 12px;
  color: var(--edu-amber-bright);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.value-layout {
  display: grid;
  grid-template-columns: minmax(300px, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(50px, 8vw, 110px);
  align-items: end;
}

.value-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--edu-line-light);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 54px rgba(64, 52, 33, 0.1);
}

.value-comparison article {
  min-height: 290px;
  padding: 30px;
}

.value-comparison article + article {
  border-left: 1px solid var(--edu-line-light);
}

.value-comparison span {
  color: var(--edu-muted);
  font-size: 0.73rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.value-comparison h3 {
  margin: 70px 0 14px;
  font-size: clamp(1.25rem, 1.8vw, 1.7rem);
  line-height: 1.2;
}

.value-comparison p {
  margin-bottom: 0;
  color: var(--edu-muted);
  font-size: 0.9rem;
}

.value-comparison .value-focus {
  background: var(--edu-amber);
}

.value-focus span,
.value-focus p {
  color: rgba(17, 17, 15, 0.7);
}

.stage-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 70px;
  background: transparent;
  border: 0;
}

.stage-grid article {
  overflow: hidden;
  border: 1px solid rgba(255, 250, 241, 0.14);
  border-radius: var(--radius);
  background: rgba(255, 250, 241, 0.08);
  padding: 12px 12px 25px;
}

.stage-grid img {
  height: 185px;
  margin-bottom: 22px;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.06);
  border-radius: calc(var(--radius) - 2px);
}

.stage-grid article > span {
  color: var(--edu-amber-bright);
  font-family: var(--edu-display);
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0.1em;
}

.stage-grid h3 {
  margin: 24px 0 12px;
  font-size: 1.25rem;
  line-height: 1.2;
}

.stage-grid p {
  min-height: 105px;
  color: rgba(255, 250, 241, 0.55);
  font-size: 0.85rem;
}

.instruments,
.contact-section {
  position: relative;
  display: grid;
  min-height: 680px;
  align-items: center;
  overflow: hidden;
  background: var(--edu-charcoal);
  color: var(--edu-paper-bright);
}

.instruments > img,
.instrument-shade,
.contact-section > img,
.contact-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.instruments > img,
.contact-section > img {
  object-fit: cover;
}

.instrument-shade {
  background: rgba(10, 10, 9, 0.54);
}

.instrument-content,
.contact-content {
  position: relative;
  z-index: 1;
}

.instrument-content h2,
.contact-content h2 {
  max-width: 900px;
}

.instrument-content > p:not(.eyebrow),
.contact-content > p:not(.eyebrow) {
  max-width: 630px;
  margin-bottom: 30px;
  color: rgba(255, 250, 241, 0.75);
}

.recording-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 64px;
}

.recording-grid article {
  border: 1px solid var(--edu-line-light);
  border-radius: var(--radius);
  background: rgba(255, 250, 241, 0.46);
  padding: 12px 12px 24px;
  box-shadow: 0 20px 54px rgba(64, 52, 33, 0.08);
}

.recording-grid img {
  height: 220px;
  margin-bottom: 24px;
  object-fit: cover;
  filter: saturate(0.8) contrast(1.03);
  border-radius: calc(var(--radius) - 2px);
}

.recording-grid .eyebrow {
  color: var(--edu-muted);
  font-size: 0.68rem;
}

.recording-grid h3 {
  min-height: 58px;
  margin-bottom: 20px;
  font-size: 1.25rem;
  line-height: 1.2;
}

.process-list {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  margin: 68px 0 0;
  border-top: 1px solid var(--edu-line-dark);
  border-bottom: 1px solid var(--edu-line-dark);
  padding: 0;
  list-style: none;
}

.process-list li {
  min-height: 230px;
  border-right: 1px solid var(--edu-line-dark);
  padding: 24px 18px;
}

.process-list li:first-child {
  border-left: 1px solid var(--edu-line-dark);
}

.process-list span {
  color: var(--edu-amber-bright);
  font-size: 0.74rem;
  font-weight: 850;
  letter-spacing: 0.1em;
}

.process-list h3 {
  margin: 62px 0 11px;
  font-size: 1.25rem;
}

.process-list p {
  margin-bottom: 0;
  color: rgba(255, 250, 241, 0.52);
  font-size: 0.78rem;
  line-height: 1.5;
}

.faq-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(50px, 8vw, 120px);
}

.faq-list {
  border-top: 1px solid var(--edu-line-light);
}

.faq-list details {
  border-bottom: 1px solid var(--edu-line-light);
  padding: 0 4px;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 720;
  padding: 25px 0;
}

.faq-list details p {
  max-width: 650px;
  color: var(--edu-muted);
  padding-bottom: 22px;
}

.contact-section {
  min-height: 720px;
}

.contact-section > img {
  filter: saturate(0.68) contrast(1.1) brightness(0.63);
}

.contact-shade {
  background: rgba(8, 8, 7, 0.47);
}

.edu-footer {
  background: #0b0b0a;
  color: rgba(255, 250, 241, 0.58);
  padding-block: 44px;
}

.footer-layout {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 30px;
  align-items: center;
  font-size: 0.78rem;
}

.footer-layout p {
  margin: 0;
}

.footer-layout p:nth-child(2) {
  text-align: center;
}

.edu-dialog {
  width: min(840px, calc(100% - 32px));
  max-height: calc(100svh - 40px);
  border: 1px solid rgba(23, 23, 21, 0.18);
  border-radius: var(--radius);
  background: var(--edu-paper-bright);
  color: var(--edu-ink);
  padding: clamp(28px, 5vw, 58px);
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.45);
}

.edu-dialog::backdrop {
  background: rgba(5, 5, 4, 0.78);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.edu-dialog .eyebrow {
  color: var(--edu-amber);
}

.edu-dialog h2 {
  max-width: 680px;
  font-size: clamp(2.5rem, 5vw, 4.9rem);
}

.dialog-close {
  float: right;
  cursor: pointer;
  border: 1px solid var(--edu-line-light);
  border-radius: 999px;
  background: transparent;
  color: var(--edu-ink);
  font-family: var(--edu-display);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0;
  padding: 10px 14px;
}

:lang(zh-CN) .hero-content h1 {
  line-height: 1.08;
}

:lang(zh-CN) main h2 {
  font-size: clamp(2.3rem, 4vw, 4.1rem);
  line-height: 1.14;
}

.dialog-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin-top: 38px;
  background: var(--edu-line-light);
  border: 1px solid var(--edu-line-light);
}

.dialog-columns section {
  background: var(--edu-paper-bright);
  padding: 26px;
}

.dialog-columns section > span {
  color: var(--edu-amber);
  font-family: var(--edu-display);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.08em;
}

.dialog-columns h3 {
  margin: 42px 0 18px;
  font-size: 1.8rem;
}

.dialog-columns li {
  margin-bottom: 10px;
}

.stage-pending img {
  filter: saturate(0) contrast(1.06);
}

.stage-dialog img,
.edu-dialog > img {
  max-height: 340px;
  margin-bottom: 28px;
  object-fit: cover;
}

.dialog-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

@media (max-width: 1000px) {
  .edu-header {
    grid-template-columns: 1fr auto;
  }

  .edu-nav {
    display: none;
  }

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

  .proof-grid div:nth-child(3) {
    border-left: 1px solid var(--edu-line-dark);
  }

  .split-lead,
  .outcomes-layout,
  .value-layout,
  .faq-layout {
    grid-template-columns: 1fr;
  }

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

  .process-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .process-list li:nth-child(4) {
    border-left: 1px solid var(--edu-line-dark);
  }
}

@media (max-width: 760px) {
  html {
    scroll-padding-top: 80px;
  }

  .page-width {
    width: min(100% - 36px, 620px);
  }

  .edu-header {
    top: 8px;
    width: calc(100% - 16px);
    min-height: 54px;
    padding: 6px 7px 6px 9px;
  }

  .edu-brand img {
    width: 36px;
    height: 36px;
  }

  .edu-brand span,
  .header-cta {
    display: none;
  }

  .language-button {
    min-width: 60px;
    min-height: 36px;
  }

  .edu-hero {
    min-height: auto;
  }

  .hero-image {
    object-position: 64% center;
  }

  .hero-content {
    padding-top: 132px;
    padding-bottom: 76px;
  }

  .hero-content h1 {
    font-size: clamp(2.25rem, 10.5vw, 3.25rem);
    line-height: 1.02;
  }

  .hero-copy {
    max-width: 480px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .edu-button {
    width: 100%;
  }

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

  .proof-grid div,
  .proof-grid div:nth-child(3) {
    min-height: 82px;
    border: 1px solid var(--edu-line-light);
  }

  .reality-grid,
  .loop-grid,
  .recording-grid,
  .stage-grid,
  .value-comparison,
  .dialog-columns {
    grid-template-columns: 1fr;
  }

  .reality-grid article,
  .loop-step,
  .loop-step:first-child,
  .value-comparison article + article {
    border-right: 1px solid var(--edu-line-light);
    border-bottom: 1px solid var(--edu-line-light);
    border-left: 1px solid var(--edu-line-light);
  }

  .reality-grid article {
    min-height: auto;
  }

  .reality-grid h3 {
    margin-top: 28px;
  }

  .loop-step > p:not(.eyebrow),
  .stage-grid p,
  .recording-grid h3 {
    min-height: 0;
  }

  .loop-step img,
  .recording-grid img {
    height: auto;
    aspect-ratio: 16 / 10;
  }

  .outcomes-layout {
    gap: 54px;
  }

  .value-comparison article {
    min-height: 240px;
  }

  .value-comparison h3 {
    margin-top: 48px;
  }

  .stage-grid {
    gap: 1px;
  }

  .stage-grid img {
    height: auto;
    aspect-ratio: 16 / 10;
  }

  .instruments,
  .contact-section {
    min-height: 720px;
  }

  .instruments > img {
    object-position: 62% center;
  }

  .process-list {
    grid-template-columns: 1fr 1fr;
  }

  .process-list li:nth-child(odd) {
    border-left: 1px solid var(--edu-line-dark);
  }

  .process-list li:nth-child(4) {
    border-left: 0;
  }

  .footer-layout {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-layout .edu-brand {
    justify-content: center;
  }

  .footer-layout p:nth-child(2) {
    text-align: center;
  }

  .edu-dialog {
    padding: 22px;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}