:root {
  --paper:#f7f6f2;
  --ink:#262621;
  --muted:#77766e;
  --line:#d9d8d0;
  --accent:#bb502f;
  --serif:"Noto Serif SC","Songti SC","STSong","SimSun",serif
}
* {
  box-sizing:border-box
}
html {
  scroll-behavior:smooth;
  scroll-padding-top:28px
}
body {
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Microsoft YaHei",Arial,sans-serif;
  -webkit-font-smoothing:antialiased
}
a {
  color:inherit;
  text-decoration:none
}
button,select {
  font:inherit;
  color:inherit
}
button,a,summary,select {
  -webkit-tap-highlight-color:transparent
}
button,summary {
  cursor:pointer
}
a:focus-visible,button:focus-visible,summary:focus-visible,select:focus-visible {
  outline:2px solid var(--accent);
  outline-offset:6px
}
button {
  background:none
}
p,h1,h2,h3,figure {
  margin:0
}
button {
  border:0
}
img {
  max-width:100%;
  display:block
}
[hidden] {
  display:none!important
}
.wrap {
  max-width:1320px;
  width:calc(100% - 120px);
  margin:auto
}
.skip-link {
  position:fixed;
  top:-60px;
  left:20px;
  background:var(--ink);
  color:white;
  padding:12px;
  z-index:20
}
.skip-link:focus {
  top:10px
}
.site-header {
  border-bottom:1px solid var(--line)
}
.header-inner {
  height:101px;
  display:flex;
  align-items:center;
  justify-content:space-between
}
.brand {
  display:flex;
  gap:12px;
  align-items:center
}
.brand img {
  width:45px;
  height:45px;
  object-fit:contain
}
.brand>span {
  font-size:19px;
  font-weight:600;
  letter-spacing:2px
}
.brand small {
  display:block;
  font-size:8px;
  letter-spacing:1.8px;
  margin-top:7px;
  font-weight:400
}
.header-inner nav {
  display:flex;
  gap:40px;
  font-size:12px;
  letter-spacing:1px
}
.header-inner nav a:hover {
  color:var(--accent)
}
.header-trial {
  display:flex;
  gap:36px;
  align-items:center;
  border:1px solid var(--ink);
  padding:12px 17px;
  font-size:11px
}
.header-trial:hover {
  background:var(--ink);
  color:var(--paper)
}
.header-trial span {
  font-size:20px
}
.edition-line {
  display:flex;
  align-items:center;
  gap:28px;
  font-size:10px;
  color:var(--muted);
  letter-spacing:1px;
  padding-top:25px
}
.edition-line p {
  color:var(--ink);
  font-size:9px;
  letter-spacing:2px
}
.edition-end {
  margin-left:auto
}
.hero-grid {
  display:grid;
  grid-template-columns:1.45fr 1fr;
  gap:55px;
  padding:51px 0 49px;
  align-items:center
}
.hero h1 {
  font:400 clamp(46px,4.7vw,72px)/1.3 var(--serif);
  letter-spacing:-2px
}
.hero h1 span {
  color:var(--accent)
}
.hero-english {
  font:italic 17px/1.5 Georgia,serif;
  margin-top:23px;
  color:var(--muted)
}
.hero-aside {
  max-width:365px;
  justify-self:end
}
.aside-rule {
  display:block;
  width:30px;
  height:2px;
  background:var(--accent);
  margin-bottom:20px
}
.hero-aside>p:first-of-type {
  font:21px/1.7 var(--serif)
}
.hero-description {
  font-size:11px;
  line-height:2.1;
  color:var(--muted);
  margin:18px 0 21px
}
.editorial-link {
  display:inline-flex;
  gap:44px;
  align-items:center;
  padding:10px 0;
  border-bottom:1px solid var(--ink);
  font-size:12px
}
.editorial-link span {
  font-size:22px;
  transition:transform .2s
}
.editorial-link:hover span {
  transform:translate(3px,-3px)
}
.hero-figure {
  position:relative;
  animation:arrive .7s ease both
}
.hero-figure>img {
  width:100%;
  height:clamp(300px,31vw,470px);
  object-fit:cover;
  object-position:50% 60%;
  filter:saturate(.72)
}
.image-caption {
  position:absolute;
  inset:0 0 35px;
  padding:38px 42px;
  display:flex;
  flex-direction:column;
  justify-content:flex-end;
  color:#fff;
  background:linear-gradient(90deg,rgba(25,23,16,.36),transparent 60%)
}
.image-caption>span {
  font-size:9px;
  letter-spacing:2px;
  margin-bottom:14px
}
.image-caption p {
  font:25px/1.6 var(--serif);
  text-shadow:0 1px 10px #33291433
}
.image-caption a {
  position:absolute;
  bottom:37px;
  right:38px;
  width:43px;
  height:43px;
  border:1px solid #ffffff80;
  display:grid;
  place-items:center;
  font-size:22px
}
.hero-figure figcaption {
  height:35px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size:9px;
  letter-spacing:1px;
  color:var(--muted)
}
.brand-statement {
  display:grid;
  grid-template-columns:155px 1fr 180px;
  gap:40px;
  padding:56px 0;
  border-bottom:1px solid var(--line);
  align-items:center
}
.statement-index {
  font-size:10px;
  line-height:1.8;
  letter-spacing:2px;
  color:var(--muted)
}
.statement-title {
  font:26px/1.6 var(--serif)
}
.statement-text {
  font-size:11px;
  color:var(--muted);
  line-height:2;
  margin-top:9px
}
.teacher-signature {
  text-align:right
}
.teacher-signature strong {
  font:25px var(--serif)
}
.teacher-signature span {
  display:block;
  margin-top:11px;
  font-size:10px;
  letter-spacing:2px;
  color:var(--muted)
}
.catalog-section {
  padding:89px 0 95px
}
.section-label {
  display:flex;
  justify-content:space-between;
  font-size:10px;
  letter-spacing:2px
}
.section-label>span:last-child {
  letter-spacing:1px
}
.section-heading {
  display:flex;
  justify-content:space-between;
  gap:40px;
  align-items:flex-end;
  margin:33px 0 47px
}
h2 {
  font:400 40px/1.55 var(--serif);
  letter-spacing:-1px
}
.section-heading h2 span,.contact-grid h2 span {
  color:#77766e
}
.section-heading>p {
  font-size:11px;
  color:var(--muted);
  line-height:2.1;
  padding-bottom:9px
}
.catalog-toolbar {
  display:flex;
  justify-content:space-between;
  border-bottom:1px solid var(--ink);
  align-items:center
}
.segmented {
  display:flex;
  gap:35px
}
.segmented button {
  position:relative;
  font-size:18px;
  padding:17px 0
}
.segmented button span {
  font:10px Georgia,serif;
  margin-left:6px;
  color:var(--muted)
}
.segmented button.active {
  color:var(--accent)
}
.segmented button.active:after {
  content:"";
  position:absolute;
  bottom:-1px;
  left:0;
  right:0;
  height:3px;
  background:var(--accent)
}
.subject-filter {
  font-size:10px;
  color:var(--muted);
  display:flex;
  align-items:center;
  gap:17px
}
.subject-filter select {
  border:0;
  background:transparent;
  padding:8px 20px 8px 0;
  font-size:12px;
  color:var(--ink)
}
.catalog-columns,.course-card {
  display:grid;
  grid-template-columns:1.75fr .8fr .6fr;
  gap:26px;
  align-items:center
}
.catalog-columns {
  padding:18px 0;
  font-size:9px;
  letter-spacing:1px;
  color:var(--muted);
  border-bottom:1px solid var(--line)
}
.catalog-columns>span:first-child {
  padding-left:48px
}
.course-card {
  padding:32px 0;
  border-bottom:1px solid var(--line);
  transition:background .2s
}
.course-card:hover {
  background:#eeede650
}
.course-identity {
  display:flex;
  gap:27px;
  align-items:flex-start
}
.course-number {
  font:italic 16px Georgia,serif;
  color:#908d82;
  padding-top:3px;
  width:21px;
  flex-shrink:0
}
.course-label {
  font-size:9px;
  color:var(--accent);
  letter-spacing:1px
}
.course-info h3 {
  font:400 23px/1.4 var(--serif);
  margin:10px 0
}
.course-info p {
  font-size:11px;
  line-height:1.9;
  color:var(--muted)
}
.course-arrangement {
  font-size:12px;
  line-height:1.8
}
.course-arrangement small {
  display:block;
  font-size:10px;
  color:var(--muted);
  margin-top:8px
}
.course-bottom {
  display:flex;
  justify-content:space-between;
  gap:14px;
  align-items:center
}
.price {
  font:26px Georgia,serif;
  white-space:nowrap
}
.price small {
  font:13px Georgia,serif;
  margin-right:3px
}
.price-label {
  display:block;
  font-size:9px;
  color:var(--muted);
  margin-top:8px
}
.course-bottom button {
  width:43px;
  height:43px;
  border-radius:50%;
  border:1px solid #bcbab0;
  flex-shrink:0;
  font-size:22px;
  transition:background .2s,color .2s
}
.course-bottom button:hover {
  background:var(--ink);
  color:white
}
.catalog-note {
  font-size:10px;
  line-height:1.8;
  color:var(--muted);
  margin-top:20px
}
.loading-copy {
  padding:30px 0;
  font-size:13px;
  color:var(--muted)
}
.approach-section {
  background:#282925;
  color:#ecebe3;
  padding:57px 0 86px
}
.approach-section .section-label {
  border-bottom:1px solid #55564e;
  padding-bottom:25px;
  color:#b6b7ac
}
.approach-grid {
  display:grid;
  grid-template-columns:1fr 1.08fr;
  gap:100px;
  padding-top:64px
}
.serif-english {
  font:italic 21px Georgia,serif;
  color:#b3b3a6;
  margin-bottom:20px
}
.approach-copy h2 {
  font-size:45px;
  line-height:1.5
}
.approach-copy h2 em {
  font-style:normal;
  color:#d18d6e
}
.approach-copy>p:not(.serif-english) {
  font-size:11px;
  line-height:2.1;
  color:#b8b9af;
  margin:23px 0
}
.light-link {
  border-color:#898a7e;
  margin-top:7px
}
.method-list details {
  border-bottom:1px solid #55564e
}
.method-list details:first-child {
  border-top:1px solid #55564e
}
.method-list summary {
  list-style:none;
  display:flex;
  align-items:center;
  gap:26px;
  padding:29px 0;
  font:22px var(--serif)
}
.method-list summary::-webkit-details-marker {
  display:none
}
.method-number {
  font:italic 14px Georgia,serif;
  color:#a8a99b;
  align-self:flex-start;
  padding-top:3px;
  width:22px
}
.method-list summary small {
  display:block;
  font:8px Arial,sans-serif;
  letter-spacing:2px;
  color:#b6b7aa;
  margin-bottom:10px
}
.detail-mark {
  margin-left:auto;
  width:14px;
  height:14px;
  position:relative
}
.detail-mark:before,.detail-mark:after {
  content:"";
  position:absolute;
  background:#b6b7aa;
  left:0;
  top:6px;
  width:14px;
  height:1px
}
.detail-mark:after {
  transform:rotate(90deg)
}
details[open] .detail-mark:after {
  transform:rotate(0)
}
.method-body {
  padding:0 20px 28px 48px;
  font-size:12px;
  line-height:2.1;
  color:#c2c3b8
}
.method-body>span {
  display:block;
  font-size:9px;
  color:#929486;
  margin-top:15px;
  letter-spacing:1px
}
.contact-section {
  padding:82px 0 93px
}
.contact-grid {
  display:grid;
  grid-template-columns:1.2fr 1fr;
  gap:85px;
  margin-top:39px;
  align-items:center
}
.contact-grid>div>p {
  font-size:11px;
  line-height:2.1;
  color:var(--muted);
  margin-top:20px
}
.public-account {
  display:flex;
  gap:20px;
  margin-top:30px;
  font-size:11px;
  align-items:center
}
.public-account span {
  color:var(--muted);
  font-size:10px
}
.public-account strong {
  font-weight:400
}
.assistant {
  border-top:1px solid var(--line);
  padding:27px 0;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:15px
}
.assistant:last-child {
  border-bottom:1px solid var(--line)
}
.assistant p:first-child {
  font-size:11px;
  color:var(--muted)
}
.assistant strong {
  display:block;
  font:25px Georgia,serif;
  margin:10px 0
}
.assistant p:last-child {
  font-size:10px;
  color:var(--muted)
}
.assistant button {
  font-size:10px;
  border-bottom:1px solid var(--ink);
  padding:8px 0;
  white-space:nowrap
}
.site-footer {
  background:#ebeae3;
  padding:33px 0 23px
}
.footer-wordmark {
  font:clamp(40px,8.8vw,134px)/1.2 Georgia,serif;
  letter-spacing:-6px;
  display:flex;
  justify-content:space-between;
  padding:0 0 27px;
  border-bottom:1px solid #cac9c1
}
.footer-wordmark span {
  font-style:italic;
  font-weight:400;
  color:#6c6d62
}
.footer-main {
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:34px 0
}
.footer-main strong {
  font-size:13px;
  font-weight:400;
  letter-spacing:1px
}
.footer-main p {
  font-size:10px;
  color:var(--muted);
  margin-top:12px
}
.footer-links {
  display:flex;
  gap:28px;
  font-size:10px
}
.footer-bottom {
  display:flex;
  justify-content:space-between;
  border-top:1px solid #d5d4cb;
  padding-top:20px;
  font-size:9px;
  color:var(--muted)
}
.preview-note {
  display:flex;
  gap:20px;
  justify-content:flex-end;
  margin-top:17px;
  font-size:9px;
  color:#77766e
}
.preview-note span {
  margin-right:auto
}
.preview-note a {
  text-decoration:underline;
  text-underline-offset:3px
}
.visually-hidden {
  position:absolute;
  width:1px;
  height:1px;
  margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap
}
.dialog-open {
  overflow:hidden
}
dialog {
  background:var(--paper);
  color:var(--ink);
  border:1px solid var(--line);
  padding:58px 48px 42px;
  width:calc(100% - 32px);
  max-width:720px;
  max-height:88vh
}
dialog::backdrop {
  background:#15161199;
  backdrop-filter:blur(4px)
}
.close-dialog {
  position:absolute;
  right:22px;
  top:16px;
  font-size:10px;
  display:flex;
  align-items:center;
  gap:10px
}
.close-dialog span {
  font-size:26px
}
#course-detail h2 {
  font-size:30px;
  margin:13px 0
}
#course-detail>p {
  font-size:12px;
  line-height:1.9;
  color:var(--muted)
}
#course-detail h3 {
  font:21px var(--serif);
  margin:25px 0 12px
}
#course-detail ul {
  padding-left:20px;
  font-size:12px;
  line-height:2;
  color:var(--muted)
}
#course-detail .detail-price {
  margin:20px 0;
  color:var(--ink)
}
.detail-price strong {
  font:32px Georgia,serif
}
.detail-price small {
  margin-left:10px
}
#course-detail .editorial-link {
  margin-top:20px
}
#toast {
  position:fixed;
  z-index:30;
  left:50%;
  bottom:30px;
  transform:translateX(-50%);
  background:var(--ink);
  color:white;
  padding:14px 24px;
  font-size:12px;
  box-shadow:0 4px 20px #0002;
  max-width:90vw
}
body {
  animation:arrive .5s ease both
}
@keyframes arrive {
  from {
    opacity:0;
    transform:translateY(8px)
  }
  to {
    opacity:1;
    transform:none
  }
}
@media(min-width:1600px) {
  .hero h1 {
    font-size:76px
  }
}
@media(max-width:1100px) {
  .wrap {
    width:calc(100% - 72px)
  }
  .hero-grid {
    gap:30px
  }
  .hero h1 {
    font-size:56px
  }
  .brand-statement {
    grid-template-columns:100px 1fr 150px;
    gap:22px
  }
  .statement-title {
    font-size:23px
  }
  .section-heading h2 {
    font-size:34px
  }
  .course-card,.catalog-columns {
    grid-template-columns:1.6fr .75fr .7fr;
    gap:18px
  }
  .approach-grid {
    gap:60px
  }
  .contact-grid {
    gap:50px
  }
  .footer-wordmark {
    letter-spacing:-4px
  }
}
@media(max-width:760px) {
  .wrap {
    width:calc(100% - 40px)
  }
  .header-inner {
    height:82px
  }
  .brand img {
    width:36px;
    height:36px
  }
  .brand>span {
    font-size:16px
  }
  .brand small {
    font-size:7px;
    letter-spacing:1px
  }
  .header-inner nav {
    gap:20px;
    font-size:11px
  }
  .header-inner nav a:nth-child(2) {
    display:none
  }
  .header-trial {
    font-size:10px;
    gap:12px;
    padding:8px 12px
  }
  .edition-line {
    font-size:9px;
    gap:15px;
    padding-top:20px
  }
  .edition-line p {
    font-size:8px
  }
  .edition-end {
    display:none
  }
  .hero-grid {
    grid-template-columns:1fr;
    padding:37px 0 28px;
    gap:26px
  }
  .hero h1 {
    font-size:53px;
    line-height:1.35
  }
  .hero-english {
    font-size:15px;
    margin-top:15px
  }
  .hero-aside {
    justify-self:start;
    max-width:none;
    width:100%;
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:0 28px;
    align-items:center
  }
  .aside-rule {
    display:none
  }
  .hero-aside>p:first-of-type {
    font-size:18px;
    grid-row:span 2
  }
  .hero-description {
    font-size:10px;
    margin:0 0 6px
  }
  .editorial-link {
    font-size:11px;
    gap:24px;
    justify-self:start
  }
  .hero-figure>img {
    height:330px;
    object-position:55% 60%
  }
  .image-caption {
    padding:26px
  }
  .image-caption p {
    font-size:22px
  }
  .image-caption>span {
    font-size:8px
  }
  .image-caption a {
    right:25px;
    bottom:26px
  }
  .hero-figure figcaption {
    font-size:8px;
    letter-spacing:.5px
  }
  .brand-statement {
    grid-template-columns:1fr 135px;
    gap:17px;
    padding:33px 0
  }
  .statement-index {
    display:none
  }
  .statement-title {
    font-size:21px
  }
  .statement-text {
    font-size:10px
  }
  .teacher-signature strong {
    font-size:22px
  }
  .teacher-signature span {
    font-size:9px;
    letter-spacing:1px
  }
  .catalog-section {
    padding:56px 0 61px
  }
  .section-label {
    font-size:9px;
    letter-spacing:1px
  }
  .section-heading {
    display:block;
    margin:28px 0 25px
  }
  .section-heading h2,h2 {
    font-size:32px
  }
  .section-heading>p {
    margin-top:18px;
    font-size:10px
  }
  .segmented {
    gap:24px
  }
  .segmented button {
    font-size:16px
  }
  .subject-filter {
    gap:8px;
    font-size:9px
  }
  .subject-filter select {
    font-size:11px;
    padding-right:6px
  }
  .catalog-columns {
    display:none
  }
  .course-card {
    grid-template-columns:1fr 1fr;
    gap:20px;
    padding:26px 0
  }
  .course-identity {
    grid-column:1/-1;
    gap:17px
  }
  .course-info h3 {
    font-size:23px;
    margin:8px 0
  }
  .course-info p {
    font-size:10px
  }
  .course-arrangement {
    padding-left:38px;
    font-size:11px
  }
  .course-arrangement small {
    font-size:9px;
    margin-top:4px
  }
  .course-bottom {
    justify-content:flex-end;
    gap:23px
  }
  .price {
    font-size:25px
  }
  .price-label {
    font-size:9px
  }
  .course-bottom button {
    width:38px;
    height:38px
  }
  .catalog-note {
    font-size:9px
  }
  .approach-section {
    padding:40px 0 49px
  }
  .approach-grid {
    grid-template-columns:1fr;
    gap:40px;
    padding-top:35px
  }
  .approach-copy h2 {
    font-size:39px
  }
  .serif-english {
    font-size:18px
  }
  .approach-copy>p:not(.serif-english) {
    font-size:11px
  }
  .method-list summary {
    font-size:23px;
    padding:26px 0
  }
  .method-body {
    font-size:11px
  }
  .contact-section {
    padding:49px 0 57px
  }
  .contact-grid {
    grid-template-columns:1fr;
    gap:32px;
    margin-top:28px
  }
  .contact-grid h2 {
    font-size:35px
  }
  .contact-grid>div>p {
    font-size:10px
  }
  .public-account {
    margin-top:23px
  }
  .assistant {
    padding:23px 0
  }
  .assistant strong {
    font-size:24px
  }
  .footer-wordmark {
    font-size:8.8vw;
    letter-spacing:-1.3px;
    padding-bottom:23px
  }
  .footer-main {
    align-items:flex-start;
    gap:25px;
    padding:25px 0
  }
  .footer-main p {
    font-size:9px;
    line-height:1.8
  }
  .footer-links {
    gap:15px;
    font-size:9px;
    flex-wrap:wrap;
    justify-content:flex-end
  }
  .footer-bottom {
    font-size:8px
  }
  .preview-note {
    flex-wrap:wrap;
    font-size:8px;
    gap:12px
  }
  .preview-note span {
    width:100%
  }
  dialog {
    padding:55px 24px 28px
  }
  #course-detail h2 {
    font-size:25px
  }
}
@media(max-width:480px) {
  .header-inner nav {
    display:none
  }
  .hero h1 {
    font-size:43px;
    letter-spacing:-1px
  }
  .hero-aside {
    grid-template-columns:1fr
  }
  .hero-aside>p:first-of-type {
    display:none
  }
  .hero-description {
    font-size:11px;
    line-height:2
  }
  .hero-figure>img {
    height:310px;
    object-position:57% 60%
  }
  .image-caption {
    padding:23px 20px
  }
  .image-caption p {
    font-size:21px
  }
  .image-caption a {
    width:34px;
    height:34px;
    right:20px;
    bottom:24px
  }
  .brand-statement {
    grid-template-columns:1fr;
    gap:18px
  }
  .teacher-signature {
    text-align:left;
    display:flex;
    gap:15px;
    align-items:center
  }
  .teacher-signature strong {
    font-size:19px
  }
  .teacher-signature span {
    margin:0
  }
  .statement-title {
    font-size:23px
  }
  .section-heading h2 {
    font-size:29px
  }
  .subject-filter {
    font-size:0
  }
  .subject-filter select {
    font-size:11px
  }
  .segmented button span {
    font-size:9px
  }
  .course-bottom {
    gap:14px
  }
  .price {
    font-size:22px
  }
  .course-info h3 {
    font-size:22px
  }
  .course-card {
    grid-template-columns:1.1fr 1fr;
    gap:17px
  }
  .approach-copy h2 {
    font-size:36px
  }
  .contact-grid h2 {
    font-size:31px
  }
  .footer-main {
    display:block
  }
  .footer-links {
    justify-content:flex-start;
    margin-top:23px;
    gap:22px
  }
  .footer-bottom {
    flex-direction:column;
    gap:12px
  }
}
@media(prefers-reduced-motion:reduce) {
  html {
    scroll-behavior:auto
  }
  *,*:before,*:after {
    animation:none!important;
    transition:none!important
  }
}