/* 回音谷教育站 · 0929v7. One page; no entry gate or hidden course content. */
:root{color-scheme:light;--paper:#f5f3ed;--ink:#252823;--muted:#62675f;--line:#d7dad1;--dark:#242224;--light:#f5f3ed;--dark-muted:#bcb9ba;--ease:cubic-bezier(.2,.75,.2,1);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;font-synthesis:none;font-optical-sizing:auto}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--paper);color:var(--ink);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body,input,button{font-family:inherit}
button,input{font-size:inherit}
button,a,input{-webkit-tap-highlight-color:transparent}
a{color:inherit;text-decoration:none;touch-action:manipulation}
button{touch-action:manipulation;cursor:pointer}
button:disabled{cursor:wait}
img{display:block;max-width:100%;height:auto}
figure,p,h1,h2,h3{margin:0}
[hidden]{display:none!important}
::selection{color:#fff;background:#506856}
:focus-visible{outline:2px solid #4d7858;outline-offset:6px;border-radius:4px}
[tabindex="-1"]:focus:not(:focus-visible){outline:none}
.container,.nav-inner{width:min(1184px,calc(100% - 112px));margin-inline:auto}
.skip-link{position:fixed;top:8px;left:16px;z-index:100;padding:14px 20px;background:#fff;color:#111;border-radius:6px;transform:translateY(-150%)}
.skip-link:focus{transform:none}
.site-header{position:sticky;top:0;z-index:20;background:#242224ed;color:var(--light);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;min-height:72px;gap:24px}
.wordmark{display:flex;align-items:center;gap:20px;font-size:21px;font-weight:500;letter-spacing:.14em;white-space:nowrap}
.wordmark>span{padding-left:20px;border-left:1px solid #ffffff30;font-size:11px;font-weight:400;letter-spacing:.08em;color:#bcb9ba}
nav{display:flex;align-items:center;gap:32px;flex-shrink:0}
.nav-link{display:inline-flex;align-items:center;min-height:44px;font-size:12px;color:#d4d0d2}
.button{display:inline-flex;align-items:center;justify-content:center;gap:28px;min-height:50px;padding:0 24px;border:1px solid transparent;border-radius:999px;background:var(--light);color:#272624;font-size:14px;font-weight:500;line-height:1.3;transition:background .18s var(--ease),transform .18s var(--ease)}
.button-small{min-height:36px;padding-inline:18px;font-size:12px}
.button:active,.copy-button:active{transform:scale(.97);transition-duration:80ms}
.text-link{display:inline-flex;align-items:center;gap:16px;min-height:44px;font-size:13px;line-height:1.4}
.text-link>span,.button>span{font-size:17px;line-height:1;transition:transform .2s var(--ease)}
@media(hover:hover){.button:hover{background:#e6e2d9}.nav-link:hover,.text-link:hover{color:#a8b8a9}.button:hover>span{transform:translate(2px,-2px)}.text-link:hover>span{transform:translateY(2px)}}
.hero{position:relative;color:var(--light);background:radial-gradient(ellipse at 82% 24%,#393336 0,transparent 56%),var(--dark);overflow:clip}
.hero-inner{display:grid;grid-template-columns:minmax(0,.94fr) minmax(0,1.12fr);align-items:center;gap:24px;min-height:690px;padding-block:62px 66px}
.eyebrow,.section-label{font-size:12px;line-height:1.5;font-weight:500;letter-spacing:.14em}
.eyebrow{display:flex;align-items:center;gap:10px;color:#d6d2cf;margin-bottom:30px}
.status-dot{width:5px;height:5px;border-radius:50%;background:#bfcab8}
h1{font-size:clamp(58px,6.2vw,82px);line-height:1.14;letter-spacing:-.045em;font-weight:500}
.hero-lead{margin-top:28px;font-size:19px;font-weight:400;line-height:1.6;letter-spacing:.015em}
.hero-summary{margin-top:8px;font-size:13px;line-height:1.6;letter-spacing:.04em;color:var(--dark-muted)}
.price-pair{display:flex;align-items:flex-end;flex-wrap:wrap;column-gap:34px;row-gap:16px;margin-top:34px;font-variant-numeric:lining-nums tabular-nums}
.original-price,.early-price{display:flex;flex-direction:column;gap:8px}
.price-pair span{font-size:11px;line-height:1.4;letter-spacing:.045em}
.original-price>span{color:var(--dark-muted)}
.original-price .original-amount{font-size:46px;font-weight:450;line-height:1;letter-spacing:-.045em;white-space:nowrap}
.original-amount{text-decoration-line:line-through;text-decoration-thickness:.055em;text-decoration-color:currentColor;text-decoration-skip-ink:none}
.early-price{padding-bottom:2px;color:#cac7c3}
.early-price strong{font-size:30px;font-weight:400;line-height:1;letter-spacing:-.035em;white-space:nowrap}
.subsidy{margin-top:16px;font-size:11px;letter-spacing:.035em;line-height:1.6;color:var(--dark-muted)}
.hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:26px;margin-top:29px}
.hero-emblem{min-width:0;align-self:center;margin-top:-12px}
.logo-stage{position:relative;width:100%;aspect-ratio:1240/710;overflow:hidden;isolation:isolate}
/* Untouched original SVG, framed using the motion source's identical viewport. */
.logo-still{position:absolute;width:144.032258%;max-width:none;left:-23.870968%;top:-14.084507%;height:auto}
.logo-stage iframe{position:absolute;inset:0;width:100%;height:100%;border:0;background:transparent;color-scheme:dark;pointer-events:none;opacity:0}
.logo-stage.is-playing iframe{opacity:1}
.logo-stage.is-playing .logo-still{opacity:0}
.emblem-caption{position:relative;display:flex;flex-wrap:wrap;justify-content:center;gap:5px 16px;padding-top:18px;text-align:center;color:#bdb7b9;font-size:11px;line-height:1.8;letter-spacing:.06em}
.motion-toggle{position:absolute;right:0;top:52px;padding:0 8px;min-height:40px;border:0;background:none;color:#aba5a8;font-size:10px;letter-spacing:.05em;text-decoration:underline;text-underline-offset:4px;text-decoration-color:#716b70}
.hero-foot{display:flex;justify-content:space-between;align-items:center;min-height:66px;border-top:1px solid #ffffff1c;color:#b7b2b3;font-size:11px;letter-spacing:.04em}
.hero-foot>a{display:grid;place-items:center;width:44px;height:44px;color:#eee;font-size:21px}
.platform-section{padding-block:108px 85px;background:var(--paper)}
.section-label{color:var(--muted);margin-bottom:28px}
.section-heading{display:grid;grid-template-columns:1.3fr 1fr;align-items:end;gap:70px;margin-bottom:52px}
h2{font-size:clamp(40px,4.6vw,62px);line-height:1.23;letter-spacing:-.045em;font-weight:500}
.section-description{padding-bottom:4px;color:var(--muted);font-size:16px;line-height:1.9;letter-spacing:.01em}
.platform-screen{border:1px solid #d9dcd4;border-radius:16px;overflow:hidden;background:#f9faf7;box-shadow:0 24px 70px -40px #26382a42}
.platform-screen>img{width:100%}
.platform-figure figcaption{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px 24px;margin-top:18px;color:#697166;font-size:11px;line-height:1.6;letter-spacing:.015em}
.platform-notes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:35px;margin-top:44px}
.platform-notes>p{display:flex;align-items:center;gap:16px;padding-top:20px;border-top:1px solid var(--line);font-size:15px;font-weight:400;letter-spacing:.025em}
.platform-notes span{font-size:10px;font-weight:400;color:#626e5a;font-variant-numeric:tabular-nums}
.mentors-section{padding-block:88px 96px;background:#e8ece4}
.mentors-layout{display:grid;grid-template-columns:1.15fr 1fr;align-items:start;gap:100px}
.mentors-heading .section-label{margin-bottom:27px}
.mentors-heading h2{font-size:clamp(39px,4.3vw,57px)}
.mentors-intro{font-size:16px;line-height:1.85;color:#606a5b;margin-top:28px}
.teaching-details{padding-top:6px}
.teaching-details article+article{margin-top:31px;padding-top:31px;border-top:1px solid #cbd2c5}
.detail-index{display:block;color:#5c6854;font-size:10px;line-height:1.4;letter-spacing:.06em;margin-bottom:14px}
.teaching-details h3{font-size:23px;font-weight:500;letter-spacing:-.035em;line-height:1.5}
.teaching-details p{font-size:14px;line-height:1.85;color:#5c6757;margin-top:12px}
.enroll-section{padding-block:108px 90px;background:#fffefa}
.enroll-layout{display:grid;grid-template-columns:1.22fr 1fr;align-items:center;gap:100px}
.enroll-copy .section-label{margin-bottom:27px}
.enroll-copy h2{font-size:clamp(40px,4.6vw,62px)}
.enroll-description{margin-top:28px;color:var(--muted);font-size:15px;line-height:1.9}
.enroll-section .price-pair{margin-top:40px;gap:36px}
.enroll-section .original-price>span{color:#676b62}
.enroll-section .original-amount{color:#383b35;font-size:54px}
.enroll-section .early-price{color:#66715f}
.enroll-section .early-price strong{font-size:34px}
.enroll-section .subsidy{color:#727769;margin-top:20px}
.subsidy>span{display:block;margin-top:3px;font-size:10px;color:#71776a}
.contact{width:300px;max-width:100%;justify-self:end;padding-top:4px;text-align:center}
.contact figure{margin-bottom:24px}
.contact-qr{width:244px;margin:0 auto 20px;background:#fff;border:1px solid #e7e7e0;border-radius:8px;padding:10px}
.contact figcaption{font-size:13px;line-height:1.7;color:#4d5647}
.contact-label{display:block;font-size:10px;color:#65715b;line-height:1.5;letter-spacing:.05em;text-align:left}
.copy-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding-block:2px;border-bottom:1px solid var(--line)}
.copy-row input{display:block;min-width:0;width:100%;padding:10px 0;border:0;outline-offset:0;border-radius:0;background:none;color:#41463b;font-family:ui-monospace,"SFMono-Regular",Menlo,monospace;font-size:13px;line-height:1.4;text-overflow:ellipsis}
.copy-button{flex-shrink:0;min-height:44px;padding:0 8px;border:0;background:transparent;color:#40593c;font-size:12px;transition:transform .18s var(--ease)}
.copy-status{min-height:23px;padding-top:7px;color:#52674a;font-size:11px;line-height:1.5;text-align:left}
.qr-download{font-size:11px;color:#65715b;gap:10px}.qr-download>span{font-size:13px}
.site-footer{padding-block:23px;background:#fffefa;border-top:1px solid #e6e8df}
.site-footer>.container{display:flex;justify-content:space-between;align-items:center;gap:18px;color:#65715b;font-size:12px;line-height:1.5}
.footer-en{font-size:9px;letter-spacing:.08em;margin-left:14px;color:#71776a}
.site-footer a{display:inline-flex;align-items:center;gap:16px;min-height:30px;font-size:11px}.site-footer a>span{font-size:17px}
@media(min-width:1500px){.hero-inner{min-height:760px;grid-template-columns:.96fr 1.16fr;gap:50px}.hero-emblem{margin-right:-35px}h1{font-size:88px}}
@media(max-width:1050px){
  .container,.nav-inner{width:calc(100% - 72px)}.hero-inner{grid-template-columns:1fr 1fr;gap:18px;min-height:655px;padding-block:58px}
  h1{font-size:62px}.hero-lead{font-size:16px}.hero-summary{font-size:11px}.price-pair{gap:24px}.original-price .original-amount{font-size:41px}.early-price strong{font-size:28px}
  .emblem-caption{font-size:10px;letter-spacing:0}.section-heading{gap:36px}.mentors-layout,.enroll-layout{gap:54px}.mentors-heading h2{font-size:44px}.teaching-details h3{font-size:21px}
  .enroll-copy h2{font-size:46px}.enroll-section .original-amount{font-size:46px}.enroll-section .early-price strong{font-size:30px}
}
@media(max-width:760px){
  html{scroll-padding-top:80px}.container,.nav-inner{width:calc(100% - 48px)}
  .nav-inner{min-height:64px;gap:16px}.wordmark{font-size:18px;letter-spacing:.12em}.wordmark>span{display:none}nav{gap:20px}.nav-link{font-size:11px}.button-small{min-height:34px;padding-inline:15px;font-size:11px}
  .hero{background:radial-gradient(ellipse at 70% 18%,#393336 0,transparent 53%),var(--dark)}.hero-inner{display:flex;flex-direction:column;align-items:stretch;gap:32px;min-height:0;padding-block:24px 38px}
  .hero-emblem{order:-1;width:min(86%,390px);margin:0 auto;align-self:auto}.emblem-caption{display:none}.hero-emblem:has(.motion-toggle:not([hidden])) .emblem-caption{display:flex;justify-content:flex-end;padding-top:0;min-height:22px}
  .emblem-caption>span{display:none}.motion-toggle{position:static;min-height:30px;padding:0;font-size:10px}
  .hero-copy{width:100%}.eyebrow{margin-bottom:19px;font-size:11px;gap:8px}h1{font-size:clamp(43px,9.7vw,64px);line-height:1.16;letter-spacing:-.045em}h1 br{display:none}
  .hero-lead{font-size:17px;margin-top:23px}.hero-summary{font-size:12px;margin-top:7px;letter-spacing:.015em}.hero-copy .price-pair{margin-top:27px;gap:30px}
  .original-price .original-amount{font-size:42px}.early-price strong{font-size:29px}.price-pair span{font-size:10px}.original-price,.early-price{gap:7px}
  .subsidy{margin-top:13px;font-size:10px}.hero-actions{gap:25px;margin-top:24px}.button{min-height:47px;font-size:13px;padding-inline:22px}.button-small{min-height:34px;font-size:11px;padding-inline:15px}.text-link{font-size:12px}
  .hero-foot{min-height:58px;font-size:10px;letter-spacing:0}.hero-foot>a{width:34px;font-size:19px}.platform-section{padding-block:68px 58px}.section-label{font-size:11px;margin-bottom:21px;letter-spacing:.1em}
  .section-heading{grid-template-columns:1fr;gap:23px;margin-bottom:31px}h2{font-size:clamp(36px,8.5vw,52px);line-height:1.27}.section-description{font-size:14px;line-height:1.9}.desktop-break{display:none}
  .platform-screen{border-radius:9px;box-shadow:0 16px 36px -24px #26382a30}.platform-figure figcaption{font-size:10px;line-height:1.65;margin-top:12px;gap:4px}.platform-figure figcaption>span:last-child{display:none}
  .platform-notes{gap:15px;margin-top:26px}.platform-notes>p{display:flex;flex-direction:column;align-items:flex-start;gap:9px;padding-top:15px;font-size:13px}.platform-notes span{font-size:9px}
  .mentors-section{padding-block:62px 63px}.mentors-layout{grid-template-columns:1fr;gap:36px}.mentors-heading .section-label{margin-bottom:21px}.mentors-heading h2{font-size:clamp(36px,8.5vw,52px)}.mentors-intro{font-size:14px;margin-top:22px;line-height:1.9}
  .teaching-details{display:grid;grid-template-columns:1fr 1fr;gap:28px;padding:0}.teaching-details article+article{margin:0;padding:0;border:0}.detail-index{font-size:9px;margin-bottom:12px}.teaching-details h3{font-size:19px;line-height:1.6}.teaching-details p{font-size:13px;margin-top:12px}.teaching-details p br{display:none}
  .enroll-section{padding-block:67px 54px}.enroll-layout{grid-template-columns:1fr;gap:44px}.enroll-copy .section-label{margin-bottom:21px}.enroll-copy h2{font-size:clamp(36px,8.5vw,52px)}.enroll-description{font-size:14px;margin-top:22px}
  .enroll-section .price-pair{margin-top:30px;gap:31px}.enroll-section .original-amount{font-size:46px}.enroll-section .early-price strong{font-size:30px}.enroll-section .subsidy{margin-top:17px}
  .contact{justify-self:start;width:100%;max-width:340px;border-top:1px solid var(--line);padding-top:31px}.contact-qr{width:220px;margin-bottom:17px;padding:9px}.contact figure{margin-bottom:20px}.contact figcaption{font-size:12px}.copy-row input{font-size:13px}.contact-label{font-size:10px}.qr-download{font-size:11px}
  .site-footer{padding-block:15px}.site-footer>.container{font-size:11px}.footer-en{font-size:8px;letter-spacing:.03em;margin-left:8px}.site-footer a{font-size:10px;gap:10px}
}
@media(max-width:480px){h1{max-width:340px}h1 br{display:initial}.hero-inner{gap:17px}.hero-emblem{width:90%}.hero-copy .eyebrow{margin-bottom:15px}.hero-lead{margin-top:21px}.hero-copy .price-pair{margin-top:24px}.teaching-details{grid-template-columns:1fr;gap:25px}.teaching-details article+article{padding-top:25px;border-top:1px solid #cbd2c5}.teaching-details h3{font-size:21px}.contact{justify-self:center}}
@media(max-width:360px){.container,.nav-inner{width:calc(100% - 40px)}nav{gap:13px}.hero-lead{font-size:15px}.hero-summary{font-size:11px}.hero-copy .price-pair{gap:24px}.original-price .original-amount{font-size:38px}.early-price strong{font-size:26px}.hero-actions{gap:19px}.hero-foot{font-size:9px}.enroll-section .price-pair{gap:26px}.enroll-section .original-amount{font-size:41px}.enroll-section .early-price strong{font-size:28px}.footer-en{display:none}}
@media(max-height:500px) and (orientation:landscape){.site-header{position:relative}.hero-inner{padding-top:25px}.hero-emblem{width:240px}.hero-inner{gap:25px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}.logo-stage iframe{display:none}.logo-stage .logo-still{opacity:1}.motion-toggle{display:none!important}}
@media(prefers-reduced-transparency:reduce){.site-header{background:var(--dark);backdrop-filter:none;-webkit-backdrop-filter:none}}
@media(prefers-contrast:more){:root{--muted:#394035;--dark-muted:#ddd;--line:#8a9380}.hero-summary,.emblem-caption,.motion-toggle,.hero-foot{color:#ddd}.footer-en,.site-footer,.contact-label,.subsidy>span{color:#4b5543}}
/* Future approved nine-image export, separate from the public reading flow. */
html.export-mode{scrollbar-width:none;scroll-behavior:auto}.export-mode body{background:var(--dark)}.export-mode body>*:not(#mosaic){display:none!important}
.export-poster{position:relative;container-type:inline-size;width:100%;aspect-ratio:1;background:radial-gradient(ellipse at 80% 35%,#3b3339,transparent 60%),var(--dark);color:var(--light);overflow:hidden}
.visual-eyebrow{position:absolute;left:8%;top:7%;font-size:3cqw;letter-spacing:.12em}.visual-eyebrow>span{font-size:1.5cqw;letter-spacing:.08em;margin-left:1.5cqw}
.export-title{position:absolute;left:8%;top:18%;font-size:6.1cqw;font-weight:500;line-height:1.2;letter-spacing:-.04em}.export-logo{position:absolute;width:110%;max-width:none;left:-6%;top:25.5%}
.export-platform{position:absolute;left:8%;top:75.5%;font-size:2.3cqw;color:#cbc5c4}.export-date{position:absolute;left:8%;top:81%;font-size:5.6cqw;line-height:1}.export-date>span{display:block;font-size:2cqw;line-height:1.5;margin-top:.8cqw}
.export-price{position:absolute;left:33%;top:79.5%;line-height:1.25}.export-price>span{display:block;font-size:1.8cqw;color:#bcb5b9;margin-bottom:.6cqw}.export-price>del{font-size:6.3cqw;line-height:1.1;font-weight:500;letter-spacing:-.04em}.export-price>small{display:block;font-size:2.4cqw;margin-top:.6cqw;color:#cbc5c4}
.export-subsidy{position:absolute;left:8%;top:92%;font-size:1.8cqw;color:#bcb5b9}.export-qr{position:absolute;left:75%;top:76%;width:17%;text-align:center}.export-qr>img{width:100%;height:auto;background:#fff;padding:4%;border-radius:.7cqw}.export-qr>span{display:block;font-size:1.7cqw;line-height:1.5;margin-top:.8cqw;color:#cbc5c4}