:root {
  --ink: #18312f;
  --ink-soft: #566d68;
  --paper: #f6f2e9;
  --paper-deep: #ece5d7;
  --card: #fffdf8;
  --green: #173d3a;
  --green-2: #2d6962;
  --green-soft: #dcebe5;
  --green-pale: #eef6f2;
  --orange: #b84d2b;
  --orange-soft: #f9e4d7;
  --yellow: #f0c267;
  --line: rgba(24, 49, 47, 0.13);
  --shadow-sm: 0 10px 30px rgba(37, 54, 49, 0.07);
  --shadow-lg: 0 24px 70px rgba(20, 45, 42, 0.14);
  --radius-lg: 30px;
  --radius-md: 22px;
  --radius-sm: 15px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", system-ui, sans-serif;
  --font-serif: "Songti SC", "STSong", "SimSun", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

::selection {
  color: #fff;
  background: var(--green-2);
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 50%;
  padding: 10px 16px;
  border-radius: 12px;
  color: #fff;
  background: var(--orange);
  font-size: 14px;
  font-weight: 750;
  text-decoration: none;
  transform: translate(-50%, -160%);
  transition: transform 0.18s ease;
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

.site-hero {
  position: relative;
  overflow: hidden;
  min-height: 760px;
  padding: 22px 28px 96px;
  color: #fffdf5;
  background:
    radial-gradient(circle at 82% 20%, rgba(240, 194, 103, 0.14), transparent 24rem),
    radial-gradient(circle at 10% 100%, rgba(184, 77, 43, 0.16), transparent 28rem),
    var(--green);
  isolation: isolate;
}

.site-hero::before {
  position: absolute;
  z-index: -1;
  top: -270px;
  right: -170px;
  width: 680px;
  height: 680px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 50%;
  box-shadow:
    inset 0 0 0 72px rgba(255, 255, 255, 0.025),
    inset 0 0 0 150px rgba(240, 194, 103, 0.035);
  content: "";
}

.top-nav,
.hero-shell,
.section-shell {
  width: min(1120px, 100%);
  margin-inline: auto;
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 50%;
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  border-radius: 999px;
  background: var(--yellow);
  content: "";
}

.brand-mark::before {
  top: 15px;
  left: 7px;
  width: 18px;
  height: 2px;
}

.brand-mark::after {
  top: 7px;
  left: 15px;
  width: 2px;
  height: 18px;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.25;
}

.brand small {
  margin-top: 2px;
  color: rgba(255, 253, 245, 0.58);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}

.nav-links a {
  color: rgba(255, 253, 245, 0.72);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: color 0.18s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: #fff;
}

.nav-start {
  padding: 10px 17px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  color: #fff;
  background: rgba(255, 255, 255, 0.07);
  font-size: 13px;
  font-weight: 750;
  text-decoration: none;
  transition: 0.18s ease;
}

.nav-start:hover,
.nav-start:focus-visible {
  border-color: var(--yellow);
  background: rgba(240, 194, 103, 0.14);
  outline: none;
}

.hero-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(320px, 0.72fr);
  align-items: end;
  gap: 78px;
  padding-top: 92px;
}

.eyebrow,
.section-label,
.map-label {
  margin: 0;
  color: var(--orange);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.eyebrow,
.map-label {
  color: var(--yellow);
}

.hero-copy h1 {
  max-width: 760px;
  margin: 22px 0 26px;
  font-family: var(--font-serif);
  font-size: clamp(48px, 6.2vw, 76px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.045em;
}

.hero-copy h1 span {
  display: block;
  color: var(--yellow);
}

.hero-lead {
  max-width: 710px;
  margin: 0;
  color: rgba(255, 253, 245, 0.72);
  font-size: 18px;
  line-height: 1.82;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 21px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  transition: 0.2s ease;
}

.button-primary {
  color: var(--green);
  background: var(--yellow);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: #ffd477;
  transform: translateY(-2px);
  outline: none;
}

.button-secondary {
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.11);
  outline: none;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 44px 0 0;
  padding: 0;
  list-style: none;
}

.hero-stats li {
  min-width: 132px;
  padding: 0 25px;
  border-left: 1px solid rgba(255, 255, 255, 0.15);
}

.hero-stats li:first-child {
  padding-left: 0;
  border-left: 0;
}

.hero-stats strong,
.hero-stats span {
  display: block;
}

.hero-stats strong {
  color: #fff;
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.25;
}

.hero-stats span {
  margin-top: 3px;
  color: rgba(255, 253, 245, 0.53);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.hero-map {
  position: relative;
  padding: 30px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.075);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.16);
  backdrop-filter: blur(12px);
}

.hero-map::before {
  position: absolute;
  top: 25px;
  right: 25px;
  width: 52px;
  height: 52px;
  border: 1px solid rgba(240, 194, 103, 0.4);
  border-radius: 50%;
  box-shadow: inset 0 0 0 9px rgba(240, 194, 103, 0.08);
  content: "";
}

.hero-map h2 {
  max-width: 310px;
  margin: 14px 0 24px;
  font-family: var(--font-serif);
  font-size: 25px;
  font-weight: 700;
  line-height: 1.48;
}

.hero-map ol {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-map li {
  display: grid;
  grid-template-columns: 40px 1fr;
  align-items: center;
  gap: 12px;
  min-height: 62px;
  padding: 10px 13px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.07);
}

.hero-map li > span {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  color: var(--green);
  background: var(--yellow);
  font-size: 11px;
  font-weight: 850;
}

.hero-map li strong,
.hero-map li small {
  display: block;
}

.hero-map li strong {
  font-size: 15px;
}

.hero-map li small {
  color: rgba(255, 253, 245, 0.54);
  font-size: 11px;
}

.map-note {
  margin: 20px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 253, 245, 0.58);
  font-size: 12px;
  line-height: 1.7;
}

.section {
  padding: 104px 28px;
}

.section-overview {
  position: relative;
  margin-top: -36px;
  border-radius: 36px 36px 0 0;
  background: var(--paper);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.65fr);
  align-items: end;
  gap: 72px;
  margin-bottom: 46px;
}

.section-heading h2 {
  max-width: 720px;
  margin: 13px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(34px, 4.2vw, 50px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.035em;
}

.section-heading > p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.8;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.value-card {
  position: relative;
  min-height: 260px;
  padding: 29px;
  border: 1px solid rgba(255, 255, 255, 0.86);
  border-radius: var(--radius-md);
  background: var(--card);
  box-shadow: var(--shadow-sm);
}

.value-card:nth-child(2) {
  background: var(--green-pale);
}

.value-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 28px;
  border-radius: 999px;
  color: var(--orange);
  background: var(--orange-soft);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.08em;
}

.value-card h3 {
  margin: 55px 0 10px;
  font-family: var(--font-serif);
  font-size: 25px;
  line-height: 1.4;
}

.value-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
}

.section-path {
  color: #fffdf5;
  background: var(--green);
}

.section-heading-light h2 {
  color: #fff;
}

.section-heading-light > p {
  color: rgba(255, 253, 245, 0.62);
}

.section-path .section-label {
  color: var(--yellow);
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: path-stage;
}

.path-grid li {
  position: relative;
  min-height: 238px;
  padding: 27px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
}

.path-grid li::after {
  position: absolute;
  top: 50%;
  right: -23px;
  z-index: 2;
  color: var(--yellow);
  content: "→";
  font-size: 23px;
  font-weight: 800;
  transform: translateY(-50%);
}

.path-grid li:last-child::after {
  display: none;
}

.path-number {
  color: var(--yellow);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.15em;
}

.path-grid h3 {
  margin: 49px 0 9px;
  font-family: var(--font-serif);
  font-size: 26px;
}

.path-grid p {
  margin: 0;
  color: rgba(255, 253, 245, 0.66);
  font-size: 14px;
}

.path-grid small {
  position: absolute;
  right: 27px;
  bottom: 22px;
  color: rgba(255, 253, 245, 0.38);
  font-size: 11px;
  font-weight: 700;
}

.section-courses {
  background:
    radial-gradient(circle at 10% 8%, rgba(240, 194, 103, 0.17), transparent 22rem),
    var(--paper);
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.lesson-card {
  position: relative;
  display: grid;
  grid-template-columns: 52px 1fr 28px;
  align-items: start;
  gap: 17px;
  min-height: 174px;
  padding: 25px;
  border: 1px solid rgba(24, 49, 47, 0.09);
  border-radius: var(--radius-md);
  color: inherit;
  background: var(--card);
  box-shadow: 0 8px 26px rgba(37, 54, 49, 0.045);
  text-decoration: none;
  transition: 0.2s ease;
}

.lesson-card::before {
  position: absolute;
  top: 0;
  right: 28px;
  left: 28px;
  height: 3px;
  border-radius: 0 0 999px 999px;
  background: var(--green-2);
  content: "";
  opacity: 0;
  transition: opacity 0.2s ease;
}

.lesson-card[data-stage="2"]::before {
  background: var(--orange);
}

.lesson-card[data-stage="3"]::before {
  background: var(--yellow);
}

.lesson-card:hover,
.lesson-card:focus-visible {
  border-color: rgba(45, 105, 98, 0.22);
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  outline: none;
}

.lesson-card:hover::before,
.lesson-card:focus-visible::before {
  opacity: 1;
}

.lesson-number {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 17px;
  color: #fff;
  background: var(--green-2);
  font-size: 14px;
  font-weight: 850;
}

.lesson-card small {
  color: var(--orange);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.12em;
}

.lesson-card h3 {
  margin: 6px 0 7px;
  font-family: var(--font-serif);
  font-size: 21px;
  line-height: 1.42;
}

.lesson-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.7;
}

.lesson-arrow {
  align-self: center;
  color: var(--orange);
  font-size: 20px;
  transition: transform 0.2s ease;
}

.lesson-card:hover .lesson-arrow,
.lesson-card:focus-visible .lesson-arrow {
  transform: translateX(3px);
}

.section-method {
  padding-top: 88px;
  background: #fffaf2;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.method-grid li {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  min-height: 168px;
  padding: 24px;
  border-top: 1px solid var(--line);
}

.method-grid > li > span {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  color: #fff;
  background: var(--green-2);
  font-size: 12px;
  font-weight: 850;
}

.method-grid h3 {
  margin: 2px 0 7px;
  font-family: var(--font-serif);
  font-size: 21px;
}

.method-grid p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.professional-note {
  display: grid;
  grid-template-columns: minmax(250px, 0.65fr) minmax(0, 1.35fr);
  align-items: center;
  gap: 54px;
  margin-top: 42px;
  padding: 34px 38px;
  border: 1px solid rgba(45, 105, 98, 0.15);
  border-radius: var(--radius-md);
  background: var(--green-pale);
}

.professional-note h2 {
  margin: 9px 0 0;
  font-family: var(--font-serif);
  font-size: 25px;
  line-height: 1.42;
}

.professional-note > p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.8;
}

.final-cta {
  padding: 70px 28px;
  color: #fff;
  background: var(--green-2);
}

.final-cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 48px;
}

.final-cta .section-label {
  color: var(--yellow);
}

.final-cta h2 {
  max-width: 760px;
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.35;
}

.site-footer {
  padding: 48px 28px;
  color: rgba(255, 253, 245, 0.62);
  background: #102f2d;
}

.footer-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
}

.footer-inner > div strong {
  color: #fffdf5;
  font-family: var(--font-serif);
  font-size: 17px;
}

.footer-inner > div p {
  margin: 4px 0 0;
  font-size: 12px;
}

.credit {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
}

.credit > span {
  color: rgba(255, 253, 245, 0.38);
  font-size: 8px;
  font-weight: 850;
  letter-spacing: 0.2em;
}

.credit strong {
  color: #fffdf5;
  font-family: var(--font-serif);
  font-size: 14px;
}

.credit em {
  font-family: var(--font-serif);
  font-size: 11px;
  font-weight: 400;
}

@media (max-width: 920px) {
  .site-hero {
    min-height: auto;
  }

  .hero-shell {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 48px;
    padding-top: 70px;
  }

  .hero-map {
    max-width: 620px;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .value-grid,
  .path-grid {
    grid-template-columns: 1fr;
  }

  .value-card {
    min-height: auto;
  }

  .value-card h3 {
    margin-top: 30px;
  }

  .path-grid li {
    min-height: 170px;
  }

  .path-grid h3 {
    margin-top: 30px;
  }

  .path-grid li::after {
    top: auto;
    right: auto;
    bottom: -25px;
    left: 50%;
    content: "↓";
    transform: translateX(-50%);
  }

  .professional-note {
    grid-template-columns: 1fr;
    gap: 18px;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }

  .site-hero {
    padding: 16px 18px 68px;
  }

  .top-nav {
    min-height: 58px;
  }

  .nav-links {
    display: none;
  }

  .nav-start {
    padding-inline: 14px;
    font-size: 12px;
  }

  .hero-shell {
    gap: 34px;
    padding-top: 52px;
  }

  .hero-copy h1 {
    margin-top: 17px;
    font-size: clamp(40px, 12vw, 56px);
    line-height: 1.13;
  }

  .hero-lead {
    font-size: 16px;
  }

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

  .button {
    width: 100%;
  }

  .hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-stats li {
    min-width: 0;
    padding: 0 12px;
  }

  .hero-stats strong {
    font-size: 18px;
  }

  .hero-stats span {
    font-size: 9px;
  }

  .hero-map {
    padding: 24px 21px;
    border-radius: 24px;
  }

  .hero-map h2 {
    padding-right: 38px;
    font-size: 22px;
  }

  .section {
    padding: 74px 18px;
  }

  .section-overview {
    margin-top: -26px;
    border-radius: 27px 27px 0 0;
  }

  .section-heading {
    margin-bottom: 32px;
  }

  .section-heading h2 {
    font-size: 32px;
  }

  .section-heading > p {
    font-size: 14px;
  }

  .value-card {
    padding: 24px;
  }

  .value-card h3 {
    font-size: 23px;
  }

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

  .lesson-card {
    grid-template-columns: 46px 1fr 20px;
    gap: 13px;
    min-height: 0;
    padding: 21px 18px;
  }

  .lesson-number {
    width: 46px;
    height: 46px;
    border-radius: 15px;
    font-size: 13px;
  }

  .lesson-card h3 {
    font-size: 19px;
  }

  .lesson-card p {
    font-size: 13px;
  }

  .method-grid li {
    min-height: auto;
    padding: 20px 0;
  }

  .professional-note {
    padding: 27px 23px;
  }

  .final-cta {
    padding: 58px 18px;
  }

  .final-cta-inner {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 430px) {
  .brand strong {
    font-size: 14px;
  }

  .brand small {
    font-size: 9px;
  }

  .nav-start {
    padding-inline: 12px;
  }

  .hero-stats {
    gap: 0;
  }

  .hero-stats span {
    letter-spacing: 0;
  }

  .lesson-arrow {
    display: none;
  }

  .lesson-card {
    grid-template-columns: 44px 1fr;
  }

  .credit {
    flex-wrap: wrap;
  }
}

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

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}