:root {
  --ink: #111214;
  --ink-2: #1d2024;
  --red: #cf2119;
  --red-dark: #a81610;
  --white: #ffffff;
  --surface: #f4f5f6;
  --line: #d8dadd;
  --muted: #626870;
  --success: #1e7d4d;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 18px);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "Inter", "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
}

body.nav-open {
  overflow: hidden;
}

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

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

button,
input {
  font: inherit;
}

button,
a,
summary,
input {
  outline-offset: 3px;
}

.course-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  padding: 0 clamp(20px, 4vw, 64px);
  border-bottom: 1px solid rgba(17, 18, 20, 0.12);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
}

.course-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.course-brand img {
  width: 38px;
  height: 38px;
  border-radius: 4px;
  object-fit: cover;
  flex: 0 0 auto;
  box-shadow: 0 0 0 1px rgba(17, 18, 20, 0.12);
}

.course-brand strong,
.course-brand small {
  display: block;
  line-height: 1.05;
}

.course-brand strong {
  font-size: 17px;
}

.course-brand small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.course-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.course-nav a {
  padding: 11px 13px;
  color: #363a40;
  font-size: 14px;
  font-weight: 650;
}

.course-nav a:hover,
.course-nav a:focus-visible {
  color: var(--red);
}

.course-nav .nav-cta {
  margin-left: 10px;
  padding: 11px 18px;
  color: var(--white);
  background: var(--red);
}

.course-nav .nav-cta:hover,
.course-nav .nav-cta:focus-visible {
  color: var(--white);
  background: var(--red-dark);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 11px 9px;
  border: 0;
  background: transparent;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.course-hero {
  display: grid;
  grid-template-columns: minmax(360px, 0.82fr) minmax(0, 1.18fr);
  gap: clamp(28px, 4vw, 72px);
  align-items: center;
  min-height: min(780px, calc(84svh - var(--header-height)));
  padding: clamp(52px, 7vw, 104px) clamp(20px, 5vw, 78px) clamp(44px, 5vw, 76px);
}

.hero-copy h1 {
  max-width: 720px;
  margin: 0 0 28px;
  font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
  font-size: clamp(56px, 6.5vw, 104px);
  line-height: 1.02;
  font-weight: 800;
}

.hero-copy h1 em {
  color: var(--red);
  font-style: normal;
}

.hero-copy > p {
  max-width: 590px;
  margin: 0;
  color: #3d4249;
  font-size: clamp(17px, 1.5vw, 22px);
  line-height: 1.75;
}

.hero-actions,
.today-actions,
.enrollment-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 34px 0;
}

.action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 24px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  font-size: 15px;
  font-weight: 750;
  transition: 0.18s ease;
}

.action::after {
  content: "→";
  margin-left: 18px;
  font-size: 20px;
  font-weight: 400;
}

.action.primary {
  border-color: var(--red);
  color: var(--white);
  background: var(--red);
}

.action.primary:hover,
.action.primary:focus-visible {
  border-color: var(--red-dark);
  background: var(--red-dark);
  transform: translateY(-1px);
}

.action.secondary:hover,
.action.secondary:focus-visible {
  color: var(--white);
  background: var(--ink);
}

.action.dark {
  border-color: #62666c;
  color: var(--white);
}

.action.dark:hover,
.action.dark:focus-visible {
  border-color: var(--white);
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  max-width: 620px;
  margin: 40px 0 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.hero-meta div {
  padding: 14px 18px 15px 0;
  border-right: 1px solid var(--line);
}

.hero-meta div + div {
  padding-left: 18px;
}

.hero-meta div:last-child {
  border-right: 0;
}

.hero-meta dt {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
}

.hero-meta dd {
  margin: 6px 0 0;
  font-size: 14px;
  font-weight: 750;
}

.hero-proof {
  display: grid;
  grid-template-columns: 0.88fr 0.88fr 1.24fr;
  align-items: end;
  gap: 8px;
  min-width: 0;
}

.hero-proof-single {
  display: block;
}

.hero-proof-single figure {
  aspect-ratio: 16 / 10 !important;
}

.hero-proof-single img {
  object-position: center;
}

.hero-proof figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: 4px;
  background: var(--surface);
}

.hero-proof figure:nth-child(1) {
  aspect-ratio: 0.72;
}

.hero-proof figure:nth-child(2) {
  aspect-ratio: 0.78;
}

.hero-proof figure:nth-child(3) {
  aspect-ratio: 0.84;
}

.hero-proof img {
  height: 100%;
  object-fit: cover;
}

.hero-proof figcaption {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 11px 13px;
  color: var(--white);
  background: rgba(17, 18, 20, 0.84);
  font-size: 12px;
}

.learner-route {
  display: grid;
  grid-template-columns: minmax(220px, 0.8fr) minmax(420px, 1.4fr) minmax(220px, 0.8fr);
  gap: clamp(24px, 4vw, 72px);
  align-items: center;
  padding: 42px clamp(20px, 5vw, 78px);
  color: var(--white);
  background: var(--ink);
}

.route-entry h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 2vw, 31px);
}

.route-entry p {
  margin: 0;
  color: #bec2c7;
  font-size: 14px;
  line-height: 1.7;
}

.route-flow {
  padding: 20px 24px;
  border: 1px solid #3c4046;
  border-radius: 6px;
}

.route-flow > strong {
  display: block;
  margin-bottom: 18px;
  text-align: center;
}

.route-flow ol {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.route-flow li {
  position: relative;
  color: #dfe1e4;
  font-size: 13px;
  text-align: center;
}

.route-flow li:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -10px;
  color: var(--red);
}

.public-section,
.enrollment-section,
.faq-section {
  padding: clamp(72px, 9vw, 132px) clamp(20px, 5vw, 78px);
}

.painting-thinking-section {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  min-height: 760px;
  background: #17191d;
  color: #f4f0e8;
}

.painting-thinking-visual {
  min-height: 760px;
  overflow: hidden;
}

.painting-thinking-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.painting-thinking-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(48px, 6vw, 100px);
}

.method-kicker {
  margin: 0 0 24px;
  color: var(--red);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.painting-thinking-copy h2 {
  max-width: 720px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(42px, 5vw, 76px);
  font-weight: 500;
  line-height: 1.04;
}

.method-lead {
  max-width: 760px;
  margin: 30px 0 40px;
  color: rgba(244, 240, 232, 0.76);
  font-size: 17px;
  line-height: 1.9;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid rgba(244, 240, 232, 0.22);
}

.method-grid article {
  min-height: 160px;
  padding: 24px 24px 24px 0;
  border-bottom: 1px solid rgba(244, 240, 232, 0.22);
}

.method-grid article:nth-child(2n) {
  padding-left: 24px;
  border-left: 1px solid rgba(244, 240, 232, 0.22);
}

.method-grid span {
  color: var(--red);
  font-size: 11px;
  font-weight: 800;
}

.method-grid strong {
  display: block;
  margin-top: 10px;
  font-size: 17px;
}

.method-grid p {
  margin: 10px 0 0;
  color: rgba(244, 240, 232, 0.62);
  font-size: 13px;
  line-height: 1.7;
}

.method-output {
  margin: 30px 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--red);
  color: rgba(244, 240, 232, 0.76);
  line-height: 1.8;
}

.method-output strong {
  color: #fff;
}

.section-title {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: 48px;
  align-items: end;
  margin-bottom: 48px;
}

.section-title h2 {
  max-width: 880px;
  margin: 0;
  font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
  font-size: clamp(36px, 4vw, 64px);
  line-height: 1.12;
}

.section-title p {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.75;
}

.section-title.compact {
  display: block;
  margin-bottom: 32px;
}

.section-title.compact h2 {
  font-size: clamp(30px, 3vw, 46px);
}

.section-title.compact p {
  margin-top: 14px;
}

.day-rail {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 2px solid var(--red);
}

.day-rail article {
  min-width: 0;
  padding: 24px 8px 0;
  border-right: 1px solid var(--line);
}

.day-rail article:first-child {
  padding-left: 0;
}

.day-rail article:last-child {
  padding-right: 0;
  border-right: 0;
}

.day-rail header {
  min-height: 86px;
  padding: 0 12px 16px;
}

.day-rail article:first-child header {
  padding-left: 0;
}

.day-rail span {
  color: var(--red);
  font-size: 13px;
  font-weight: 800;
}

.day-rail h3 {
  margin: 8px 0 0;
  font-size: clamp(17px, 1.45vw, 23px);
  line-height: 1.35;
}

.day-rail img {
  aspect-ratio: 0.82;
  object-fit: cover;
}

.day-rail p {
  min-height: 108px;
  margin: 0;
  padding: 18px 12px;
  color: #3e434a;
  font-size: 13px;
  line-height: 1.7;
}

.day-rail article:first-child p {
  padding-left: 0;
}

.ai-launch-panel {
  display: grid;
  grid-template-columns: minmax(360px, 0.84fr) minmax(520px, 1.16fr);
  margin-top: 72px;
  color: var(--white);
  background: var(--ink);
}

.ai-launch-media {
  min-height: 640px;
}

.ai-launch-media img {
  height: 100%;
  object-fit: cover;
}

.ai-launch-copy {
  padding: clamp(44px, 5vw, 76px);
}

.ai-launch-kicker {
  margin: 0 0 20px;
  color: #ff5148;
  font-size: 12px;
  font-weight: 800;
}

.ai-launch-copy h3 {
  max-width: 760px;
  margin: 0;
  font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
  font-size: clamp(34px, 3.4vw, 56px);
  line-height: 1.18;
}

.ai-launch-lead {
  max-width: 760px;
  margin: 24px 0 36px;
  color: #c2c6cb;
  line-height: 1.75;
}

.ai-capability-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid #474b50;
}

.ai-capability-grid article {
  min-height: 190px;
  padding: 24px 24px 24px 0;
  border-bottom: 1px solid #474b50;
}

.ai-capability-grid article:nth-child(2n) {
  padding-right: 0;
  padding-left: 24px;
  border-left: 1px solid #474b50;
}

.ai-capability-grid span,
.ai-capability-grid strong {
  display: block;
}

.ai-capability-grid span {
  margin-bottom: 14px;
  color: #ff5148;
  font-size: 11px;
  font-weight: 800;
}

.ai-capability-grid strong {
  font-size: 18px;
}

.ai-capability-grid p {
  margin: 10px 0 0;
  color: #aeb3b9;
  font-size: 13px;
  line-height: 1.7;
}

.ai-launch-output {
  margin: 28px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid #474b50;
  color: #c2c6cb;
  font-size: 13px;
  line-height: 1.7;
}

.ai-launch-output strong {
  color: var(--white);
}

.outcome-band {
  display: grid;
  grid-template-columns: minmax(260px, 0.72fr) minmax(520px, 1.28fr);
  gap: 56px;
  padding: clamp(66px, 8vw, 112px) clamp(20px, 5vw, 78px);
  color: var(--white);
  background: var(--ink);
}

.outcome-band h2 {
  margin: 0;
  font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
  font-size: clamp(35px, 4vw, 60px);
  line-height: 1.15;
}

.outcome-band > div p {
  color: #b9bec4;
  line-height: 1.7;
}

.outcome-band ol {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid #464a50;
}

.outcome-band li {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 16px;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid #464a50;
  font-size: 17px;
}

.outcome-band li span {
  color: var(--red);
  font-weight: 800;
}

.outcome-band .boundary-note {
  grid-column: 2;
  margin: -22px 0 0;
  color: #aeb3b9;
  font-size: 13px;
}

.updates-section {
  background: var(--white);
}

.today-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 0.92fr);
  min-height: 620px;
  color: var(--white);
  background: var(--ink);
}

.today-media {
  min-height: 520px;
}

.today-media img {
  height: 100%;
  object-fit: cover;
}

.today-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(44px, 6vw, 92px);
}

.today-copy time {
  color: #ff5148;
  font-weight: 800;
}

.today-copy h2 {
  margin: 22px 0 24px;
  font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
  font-size: clamp(36px, 4vw, 64px);
  line-height: 1.14;
}

.today-copy p {
  margin: 0;
  color: #c7cbd0;
  font-size: 16px;
  line-height: 1.85;
}

.updates-archive {
  padding: clamp(68px, 8vw, 110px) clamp(20px, 5vw, 78px);
}

.filter-tabs {
  display: flex;
  gap: 28px;
  border-bottom: 1px solid var(--line);
}

.filter-tabs button {
  position: relative;
  padding: 14px 0;
  border: 0;
  color: #4b5057;
  background: transparent;
  font-size: 15px;
  font-weight: 750;
  cursor: pointer;
}

.filter-tabs button.is-active {
  color: var(--red);
}

.filter-tabs button.is-active::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: var(--red);
}

.updates-list {
  border-bottom: 1px solid var(--line);
}

.update-row {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr) 118px 110px;
  gap: 24px;
  align-items: center;
  min-height: 104px;
  border-bottom: 1px solid var(--line);
}

.update-row:last-child {
  border-bottom: 0;
}

.update-date time {
  display: block;
  font-size: 16px;
  font-weight: 800;
}

.update-date small {
  display: block;
  margin-top: 5px;
  color: var(--muted);
}

.update-copy h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.45;
}

.update-copy p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.update-type {
  color: #4b5057;
  font-size: 13px;
  text-align: right;
}

.update-status {
  justify-self: end;
  color: var(--red);
  font-size: 13px;
  font-weight: 750;
}

a.update-status:hover {
  text-decoration: underline;
}

.text-command {
  display: block;
  margin: 28px auto 0;
  padding: 12px 4px;
  border: 0;
  border-bottom: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  font-weight: 750;
  cursor: pointer;
}

.live-section {
  background: var(--surface);
}

.live-list {
  border-top: 1px solid var(--ink);
}

.live-row {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr) 170px;
  gap: 28px;
  align-items: center;
  min-height: 112px;
  border-bottom: 1px solid var(--line);
}

.live-row time {
  font-size: 16px;
  font-weight: 800;
}

.live-row h3 {
  margin: 0;
  font-size: 20px;
}

.live-row p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.live-row span {
  justify-self: end;
  color: var(--red);
  font-size: 13px;
  font-weight: 750;
}

.cases-section {
  padding: clamp(72px, 9vw, 132px) clamp(20px, 5vw, 78px);
  color: var(--white);
  background: var(--ink);
}

.section-title.light p {
  color: #afb4ba;
}

.case-story {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.case-story figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 0.86;
  border-radius: 4px;
}

.case-story img {
  height: 100%;
  object-fit: cover;
}

.case-story figcaption {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 12px;
  background: rgba(17, 18, 20, 0.8);
  font-size: 12px;
}

.case-caption {
  display: grid;
  grid-template-columns: 1fr 1.6fr auto;
  gap: 36px;
  align-items: start;
  padding: 28px 0;
  border-bottom: 1px solid #42464c;
}

.case-caption h3,
.case-caption p {
  margin: 0;
}

.case-caption p {
  color: #b9bec4;
  line-height: 1.7;
}

.case-caption a {
  color: #ff5148;
  font-weight: 750;
}

.case-caption > span {
  color: #ff5148;
  font-size: 13px;
  font-weight: 750;
  text-align: right;
}

.enrollment-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 0 0 72px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  list-style: none;
}

.enrollment-flow li {
  position: relative;
  padding: 0 20px;
  border-right: 1px solid var(--line);
}

.enrollment-flow li:first-child {
  padding-left: 0;
}

.enrollment-flow li:last-child {
  padding-right: 0;
  border-right: 0;
}

.enrollment-flow li > span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  margin-bottom: 16px;
  border-radius: 50%;
  color: var(--white);
  background: var(--ink);
  font-size: 12px;
  font-weight: 800;
}

.enrollment-flow strong,
.enrollment-flow small {
  display: block;
}

.enrollment-flow strong {
  font-size: 15px;
}

.enrollment-flow small {
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.55;
}

.purchase-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.16fr) minmax(360px, 0.84fr);
  gap: clamp(34px, 5vw, 76px);
  align-items: start;
}

.price-selector > h3,
.payment-panel > h3 {
  margin: 0 0 20px;
  font-size: 22px;
}

.price-row {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  min-height: 92px;
  padding: 18px 20px;
  border-top: 1px solid var(--line);
  cursor: pointer;
}

.price-row:last-of-type {
  border-bottom: 1px solid var(--line);
}

.price-row:has(input:checked) {
  color: var(--red);
  background: #fff7f6;
  box-shadow: inset 3px 0 0 var(--red);
}

.price-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--red);
}

.price-row strong,
.price-row small {
  display: block;
}

.price-row strong {
  font-size: 17px;
}

.price-row small {
  margin-top: 7px;
  color: var(--muted);
  line-height: 1.45;
}

.price-row b {
  font-size: clamp(22px, 2.2vw, 32px);
  white-space: nowrap;
}

.payment-principle {
  margin-top: 22px;
  padding: 18px 20px;
  border: 1px solid #ef938e;
  border-radius: 4px;
  color: #71201b;
  background: #fff7f6;
  font-size: 14px;
  line-height: 1.65;
}

.payment-panel {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
}

.payment-panel > p {
  margin: 0 0 24px;
  color: var(--muted);
  line-height: 1.65;
}

.approval-field {
  display: block;
  margin-bottom: 15px;
}

.approval-field span {
  display: block;
  margin-bottom: 7px;
  font-size: 13px;
  font-weight: 750;
}

.approval-field input {
  width: 100%;
  min-height: 48px;
  padding: 0 13px;
  border: 1px solid #c7cbd0;
  border-radius: 4px;
  color: var(--ink);
  background: var(--white);
}

.payment-methods {
  display: grid;
  gap: 10px;
  margin: 22px 0;
}

.payment-methods button {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  min-height: 58px;
  padding: 10px 12px;
  border: 1px solid #cdd0d4;
  border-radius: 4px;
  color: #7a7f86;
  background: #eceeef;
  text-align: left;
}

.payment-methods button span {
  color: #30343a;
  font-size: 12px;
  font-weight: 800;
}

.payment-methods button small {
  font-size: 11px;
}

.payment-methods button:not(:disabled) {
  color: var(--ink);
  background: var(--white);
  cursor: pointer;
}

.payment-methods button:not(:disabled):hover,
.payment-methods button:not(:disabled):focus-visible {
  border-color: var(--red);
}

.payment-methods button.is-selected {
  border-color: var(--red);
  box-shadow: inset 4px 0 0 var(--red);
}

.payment-submit {
  width: 100%;
  min-height: 52px;
  border: 0;
  border-radius: 4px;
  color: var(--white);
  background: var(--red);
  font-weight: 800;
  cursor: pointer;
}

.payment-submit:hover,
.payment-submit:focus-visible {
  background: var(--red-dark);
}

.payment-message {
  min-height: 22px;
  margin: 13px 0 0 !important;
  color: var(--red) !important;
  font-size: 13px;
}

.security-note {
  margin: 20px 0 0 !important;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
}

.fee-boundary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin-top: 80px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.fee-boundary > div {
  padding: 34px 36px 34px 0;
}

.fee-boundary > div + div {
  padding-right: 0;
  padding-left: 36px;
  border-left: 1px solid var(--line);
}

.fee-boundary h3 {
  margin: 0 0 20px;
  font-size: 22px;
}

.fee-boundary ul {
  margin: 0;
  padding-left: 20px;
  color: #474c53;
  line-height: 1.9;
}

.faq-section {
  background: var(--surface);
}

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

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  position: relative;
  padding: 22px 42px 22px 0;
  list-style: none;
  font-size: 17px;
  font-weight: 750;
  cursor: pointer;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 3px;
  font-size: 24px;
  font-weight: 400;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list p {
  max-width: 880px;
  margin: -4px 0 24px;
  color: var(--muted);
  line-height: 1.8;
}

.final-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: clamp(80px, 11vw, 160px) 20px;
  text-align: center;
}

.final-cta h2 {
  max-width: 900px;
  margin: 0;
  font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
  font-size: clamp(38px, 5vw, 76px);
  line-height: 1.12;
}

.final-cta p {
  max-width: 700px;
  margin: 24px 0 10px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.75;
}

.course-footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: center;
  padding: 34px clamp(20px, 5vw, 78px);
  color: var(--white);
  background: var(--ink);
}

.course-brand.inverted small,
.course-footer p {
  color: #aeb3b9;
}

.course-brand.inverted img {
  box-shadow: 0 0 0 1px #45484d;
}

.course-footer p {
  margin: 0;
  font-size: 13px;
}

.course-footer > div {
  display: flex;
  justify-content: flex-end;
  gap: 18px;
  font-size: 13px;
}

@media (max-width: 1120px) {
  .course-nav a:not(.nav-cta) {
    padding-right: 8px;
    padding-left: 8px;
    font-size: 13px;
  }

  .course-hero {
    grid-template-columns: minmax(300px, 0.85fr) minmax(0, 1.15fr);
  }

  .learner-route {
    grid-template-columns: 1fr 1fr;
  }

  .route-flow {
    grid-column: 1 / -1;
    grid-row: 2;
  }

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

  .day-rail article:nth-child(3) {
    border-right: 0;
  }

  .day-rail article:nth-child(n + 4) {
    margin-top: 28px;
    border-top: 2px solid var(--red);
  }

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

@media (max-width: 820px) {
  :root {
    --header-height: 64px;
  }

  .course-header {
    padding: 0 18px;
    backdrop-filter: none;
  }

  .nav-toggle {
    display: block;
  }

  .course-nav {
    position: fixed;
    z-index: 110;
    top: var(--header-height);
    right: 0;
    bottom: 0;
    left: 0;
    display: none;
    align-content: start;
    overflow-y: auto;
    padding: 22px 18px;
    background: var(--white);
  }

  .course-nav.is-open {
    display: grid;
  }

  .course-nav a,
  .course-nav .nav-cta {
    margin: 0;
    padding: 17px 4px;
    border-bottom: 1px solid var(--line);
    font-size: 17px;
  }

  .course-nav .nav-cta {
    margin-top: 16px;
    padding: 16px;
    border-bottom: 0;
    text-align: center;
  }

  .course-hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 52px;
  }

  .hero-copy h1 {
    font-size: clamp(48px, 14vw, 76px);
  }

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

  .hero-proof figure:nth-child(n) {
    aspect-ratio: 0.78;
  }

  .learner-route,
  .section-title,
  .outcome-band,
  .today-panel,
  .case-caption,
  .course-footer {
    grid-template-columns: 1fr;
  }

  .route-flow {
    grid-column: auto;
    grid-row: auto;
  }

  .day-rail {
    grid-template-columns: repeat(2, 1fr);
  }

  .day-rail article:nth-child(2n) {
    border-right: 0;
  }

  .day-rail article:nth-child(n + 3) {
    margin-top: 28px;
    border-top: 2px solid var(--red);
  }

  .ai-launch-panel {
    grid-template-columns: 1fr;
  }

  .ai-launch-media {
    min-height: 480px;
  }

  .outcome-band .boundary-note {
    grid-column: auto;
    margin-top: -26px;
  }

  .today-media {
    min-height: 440px;
  }

  .today-copy {
    padding: 44px 24px;
  }

  .update-row {
    grid-template-columns: 94px minmax(0, 1fr) 80px;
  }

  .update-type {
    display: none;
  }

  .live-row {
    grid-template-columns: 130px minmax(0, 1fr);
  }

  .live-row span {
    grid-column: 2;
    justify-self: start;
  }

  .case-story {
    grid-template-columns: repeat(2, 1fr);
  }

  .enrollment-flow {
    grid-template-columns: 1fr;
    padding: 0;
  }

  .enrollment-flow li,
  .enrollment-flow li:first-child,
  .enrollment-flow li:last-child {
    display: grid;
    grid-template-columns: 40px 1fr;
    padding: 18px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .enrollment-flow li > span {
    grid-row: 1 / span 2;
    margin: 0;
  }

  .enrollment-flow small {
    grid-column: 2;
  }

  .fee-boundary {
    grid-template-columns: 1fr;
  }

  .fee-boundary > div,
  .fee-boundary > div + div {
    padding: 28px 0;
    border-left: 0;
  }

  .fee-boundary > div + div {
    border-top: 1px solid var(--line);
  }

  .course-footer > div {
    justify-content: flex-start;
    flex-wrap: wrap;
  }
}

@media (max-width: 560px) {
  .course-brand img {
    width: 34px;
    height: 34px;
  }

  .course-hero {
    padding: 42px 16px 34px;
  }

  .hero-copy h1 {
    font-size: clamp(42px, 13vw, 58px);
  }

  .hero-actions,
  .today-actions,
  .enrollment-actions {
    display: grid;
  }

  .action {
    width: 100%;
  }

  .hero-meta {
    grid-template-columns: 1fr;
  }

  .hero-meta div,
  .hero-meta div + div {
    padding: 12px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .hero-meta div:last-child {
    border-bottom: 0;
  }

  .hero-proof {
    gap: 4px;
  }

  .hero-proof figcaption {
    padding: 8px 5px;
    font-size: 9px;
  }

  .learner-route,
  .public-section,
  .enrollment-section,
  .faq-section,
  .cases-section,
  .updates-archive {
    padding-right: 16px;
    padding-left: 16px;
  }

  .route-flow {
    padding: 18px 12px;
  }

  .route-flow ol {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }

  .route-flow li::after {
    display: none;
  }

  .section-title {
    gap: 20px;
  }

  .section-title h2 {
    font-size: clamp(34px, 10vw, 48px);
  }

  .day-rail {
    grid-template-columns: 1fr;
  }

  .day-rail article:nth-child(n) {
    margin-top: 24px;
    padding-right: 0;
    padding-left: 0;
    border-top: 2px solid var(--red);
    border-right: 0;
  }

  .day-rail article:first-child {
    margin-top: 0;
  }

  .day-rail header,
  .day-rail article:first-child header,
  .day-rail p,
  .day-rail article:first-child p {
    min-height: auto;
    padding-right: 0;
    padding-left: 0;
  }

  .day-rail img {
    aspect-ratio: 1.35;
  }

  .ai-launch-panel {
    margin-top: 48px;
  }

  .ai-launch-media {
    min-height: 300px;
  }

  .ai-launch-copy {
    padding: 34px 20px;
  }

  .ai-capability-grid {
    grid-template-columns: 1fr;
  }

  .ai-capability-grid article,
  .ai-capability-grid article:nth-child(2n) {
    min-height: auto;
    padding: 20px 0;
    border-left: 0;
  }

  .outcome-band {
    padding: 64px 16px;
  }

  .today-media {
    min-height: 330px;
  }

  .today-copy h2 {
    font-size: 38px;
  }

  .filter-tabs {
    gap: 20px;
    overflow-x: auto;
  }

  .filter-tabs button {
    flex: 0 0 auto;
  }

  .update-row {
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 15px;
    padding: 17px 0;
  }

  .update-status {
    grid-column: 2;
    justify-self: start;
  }

  .live-row {
    grid-template-columns: 1fr;
    gap: 7px;
    padding: 20px 0;
  }

  .live-row span {
    grid-column: auto;
  }

  .case-story {
    gap: 4px;
  }

  .case-caption {
    gap: 16px;
  }

  .price-row {
    grid-template-columns: 22px minmax(0, 1fr);
  }

  .price-row b {
    grid-column: 2;
    justify-self: start;
  }

  .payment-panel {
    padding: 22px 16px;
  }

  .payment-methods button {
    grid-template-columns: 48px minmax(0, 1fr);
  }

  .payment-methods button small {
    grid-column: 2;
  }

  .final-cta {
    padding-right: 16px;
    padding-left: 16px;
  }
}

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

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

@media (max-width: 820px) {
  .painting-thinking-section {
    grid-template-columns: 1fr;
  }

  .painting-thinking-visual {
    min-height: 480px;
  }

  .painting-thinking-copy {
    padding: 56px 28px;
  }
}

@media (max-width: 560px) {
  .painting-thinking-visual {
    min-height: 340px;
  }

  .painting-thinking-copy {
    padding: 48px 16px;
  }

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

  .method-grid article,
  .method-grid article:nth-child(2n) {
    min-height: auto;
    padding: 20px 0;
    border-left: 0;
  }
}