:root { color-scheme: light; font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; color: #273e33; background: #f7f6f2; font-synthesis: none; --green: #2c644b; --muted: #68766c; --line: #dedfd6; }
* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
a, button { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible { outline: 3px solid #ad791d; outline-offset: 5px; }
.section-wrap { max-width: 1200px; margin-inline: auto; padding-inline: 36px; }
.skip-link { position: absolute; top: -70px; left: 20px; z-index: 10; padding: 12px; background: white; }
.skip-link:focus { top: 12px; }
.site-header { max-width: 1320px; margin: auto; padding: 26px 48px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 800; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; background: #efce7a; border-radius: 12px; font-size: 32px; transform: rotate(-9deg); }
.brand small { display: block; margin-top: 4px; font: 10px Consolas, monospace; letter-spacing: 2px; color: var(--muted); }
.site-header nav { display: flex; align-items: center; gap: 32px; font-size: 13px; font-weight: 600; }
.site-header nav a:hover, .text-link:hover { color: #20733e; }
.site-header .nav-start { border: 1px solid #cbd4c8; border-radius: 30px; padding: 11px 20px; }
.nav-start span { margin-left: 15px; }
.hero { min-height: 610px; display: grid; grid-template-columns: 1.1fr 1fr; align-items: center; gap: 24px; padding-block: 55px 64px; }
.eyebrow { display: flex; align-items: center; gap: 9px; margin: 0 0 24px; color: #527258; font: 10px/1.6 Consolas, monospace; letter-spacing: 1.7px; }
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: #719679; flex: none; }
h1 { font-size: clamp(36px, 4.5vw, 60px); line-height: 1.4; letter-spacing: -2px; margin: 0 0 25px; font-weight: 800; }
.title-accent { position: relative; color: var(--green); white-space: nowrap; }
.title-accent svg { position: absolute; left: 0; bottom: -10px; width: 100%; height: 22px; fill: none; stroke: #e9be5c; stroke-width: 4; stroke-linecap: round; }
.title-dot { color: #bd983e; }
.hero-description { color: var(--muted); line-height: 2; font-size: 15px; }
.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 35px; padding: 16px 25px; border-radius: 7px; font-size: 14px; font-weight: 600; transition: background .2s, transform .2s; }
.button-primary { background: var(--green); color: #fff; box-shadow: 0 7px 16px #2c644b16; }
.button-primary:hover { background: #214f3a; transform: translateY(-2px); }
.text-link { font-size: 13px; }
.text-link span { margin-left: 12px; }
.hero-note { margin-top: 23px; font-size: 11px; line-height: 1.8; color: var(--muted); }
.hero-note span { font-size: 16px; margin-right: 6px; }
.hero-art { position: relative; width: 100%; max-width: 490px; aspect-ratio: 1; justify-self: center; overflow: hidden; }
.hero-art::before { content: ""; position: absolute; inset: 4%; border-radius: 50%; background: radial-gradient(circle, #e5ead9 10%, #e9ecdd88 45%, transparent 70%); }
.orbit { position: absolute; border: 1px dashed #b7c5b688; border-radius: 50%; }
.orbit-outer { inset: 3%; transform: rotate(-25deg); }
.orbit-inner { inset: 15%; border-style: solid; border-color: #cdd6c3; }
.art-coordinate, .art-caption { position: absolute; color: #6f826f; font: 9px Consolas, monospace; letter-spacing: 1.7px; }
.art-coordinate { top: 8%; left: 12%; transform: rotate(-12deg); }
.art-caption { bottom: 1%; left: 16%; }
.planet { position: absolute; top: 10%; left: 38%; width: 32%; aspect-ratio: 1; border-radius: 50%; display: grid; place-items: center; background: radial-gradient(circle at 28% 25%, #ffe8a7, #e6b956 75%); box-shadow: inset -8px -10px 0 #bc8b3620, 0 15px 30px #b3a16d20; transform: rotate(-12deg); }
.planet > span { font-size: clamp(50px, 7vw, 90px); color: #99722f; }
.planet-ring { position: absolute; width: 150%; height: 32%; border: 9px solid #eac578; border-top-color: #f9e7b400; border-radius: 50%; transform: rotate(-25deg); box-shadow: 0 5px 0 #b68d3914; }
.floating-key { position: absolute; width: 15%; aspect-ratio: 1; display: grid; place-items: center; border: 1px solid #d6ddca; border-bottom: 6px solid #cdd6c1; border-radius: 14px; background: #fffef8; color: #466c4f; font: 28px Georgia, serif; box-shadow: 0 10px 15px #71885b12; }
.floating-key i { position: absolute; bottom: 12%; width: 17%; height: 3px; border-radius: 4px; background: #99b192; }
.key-f { top: 24%; left: 11%; transform: rotate(-15deg); }
.key-j { right: 5%; top: 34%; transform: rotate(18deg); background: #e4eddf; }
.small-star { position: absolute; color: #bc903b; }
.star-one { left: 23%; top: 9%; font-size: 31px; }
.star-two { right: 13%; top: 18%; font-size: 22px; color: #729477; }
.keyboard-art { position: absolute; top: 46%; left: 6%; width: 85%; padding: 17px 12px 12px; border: 1px solid #ccd4c4; border-bottom: 9px solid #c7d1bd; border-radius: 17px; background: #e4e9db; box-shadow: 0 25px 35px #56714f1c; transform: perspective(800px) rotateX(24deg) rotateZ(-9deg); }
.art-row { display: flex; justify-content: center; gap: 5px; margin-bottom: 5px; }
.art-row span { display: grid; place-items: center; width: 9%; aspect-ratio: 1.08; border: 1px solid #d2d8ca; border-bottom: 3px solid #c8d0c0; border-radius: 5px; background: #fffef7; color: #74846c; font: 11px Consolas, monospace; }
.art-row .home-key { background: #91b299; color: #fff; border-color: #6e9877; position: relative; }
.art-row .home-key::after { content: ""; position: absolute; bottom: 4px; height: 1px; width: 6px; background: white; }
.art-row .space-key { width: 46%; aspect-ratio: 6.5; font-size: 8px; }
.art-sticker { position: absolute; right: 0; bottom: 12%; transform: rotate(5deg); padding: 12px 16px; border: 1px solid #eee3c4; background: #fff9e7; border-radius: 6px; color: #786b43; font-size: 11px; box-shadow: 0 6px 18px #665e2910; }
.art-sticker span { margin-right: 5px; color: #bb9140; }
.benefit-strip { display: grid; grid-template-columns: repeat(3, 1fr); padding-block: 25px; border-block: 1px solid var(--line); }
.benefit-strip > div { display: flex; align-items: center; gap: 16px; justify-content: center; border-right: 1px solid var(--line); }
.benefit-strip > div:last-child { border: 0; }
.benefit-strip > div > span { font-size: 27px; color: #7c9478; }
.benefit-strip p { margin: 0; }
.benefit-strip strong { display: block; font-size: 13px; font-weight: 600; }
.benefit-strip small { display: block; margin-top: 6px; color: var(--muted); font-size: 11px; }
.explore { padding-block: 85px; scroll-margin-top: 24px; }
.playground-invite { display:grid; grid-template-columns:.65fr 1fr; gap:42px; align-items:center; padding-block:35px 70px; }
.playground-invite h2 { font-size:30px; margin:0 0 15px; }
.playground-invite p:not(.eyebrow) { color:var(--muted); line-height:1.9; font-size:14px; max-width:520px; }
.playground-invite .eyebrow { margin-bottom:15px; }
.playground-invite small { display:block; margin-top:14px; color:var(--muted); font-size:11px; }
.playground-art { position:relative; min-height:230px; background:#e6ecd9; border-radius:90px 90px 24px 24px; display:flex; align-items:center; justify-content:center; gap:20px; overflow:hidden; }
.playground-art:before { content:""; position:absolute; width:300px; height:115px; border:1px dashed #9faf88; border-radius:50%; transform:rotate(-25deg); }
.playground-art span { font-size:70px; position:relative; }
.playground-art span:nth-child(2) { font-size:25px; color:#a88a36; align-self:flex-start; margin-top:42px; }
.playground-art span:last-child { transform:rotate(10deg); }
@media(max-width:680px) { .playground-invite { grid-template-columns:1fr; gap:25px; } .playground-invite h2 { font-size:25px; } .site-header nav { flex-wrap:wrap; justify-content:flex-end; } }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 32px; }
.section-heading .eyebrow, .creator-story .eyebrow { margin-bottom: 14px; }
h2 { font-size: clamp(24px, 2.7vw, 34px); line-height: 1.5; margin: 0; letter-spacing: -.8px; }
.section-heading > p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.9; }
.course-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.course-card { padding: 27px; border: 1px solid #dcdfd3; border-radius: 12px; background: #edf1e7; }
.course-yellow { background: #f5efdf; border-color: #e9dfc8; }
.course-lilac { background: #eeedf3; border-color: #dfdce7; }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 28px; }
.course-symbol { display: grid; place-items: center; width: 64px; height: 59px; border: 1px solid #d1dccc; border-bottom-width: 4px; border-radius: 9px; background: #ffffff85; font: 22px Georgia, serif; color: #56785e; transform: rotate(-5deg); }
.word-symbol { font-size: 30px; color: #99804b; border-color: #e3d8bb; transform: rotate(5deg); }
.course-lilac .word-symbol { font-size: 26px; color: #807091; border-color: #d8d0e2; transform: rotate(-5deg); }
.course-tag { color: #647561; font-size: 10px; border: 1px solid #d7dfd0; padding: 5px 9px; border-radius: 20px; }
.course-number { font: 9px Consolas, monospace; letter-spacing: .8px; color: #6e7869; }
.course-card h3 { font-size: 20px; margin: 15px 0 12px; }
.course-card > p:not(.course-number) { font-size: 13px; line-height: 1.9; color: #657163; margin: 0 0 26px; }
.course-card > a { display: flex; justify-content: space-between; align-items: center; border-top: 1px solid #3c533618; padding-top: 17px; font-size: 12px; font-weight: 600; }
.course-card > a:hover { text-decoration: underline; text-underline-offset: 4px; }
.course-note { color: var(--muted); font-size: 11px; line-height: 1.8; margin-top: 18px; }
.creator-section { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center; padding-block: 60px 75px; border-top: 1px solid var(--line); scroll-margin-top: 24px; }
.creator-story > p:not(.eyebrow) { color: var(--muted); font-size: 14px; line-height: 2; margin-top: 20px; }
.creator-story strong { font-weight: 600; color: #405846; }
.creator-signature { display: block; font: italic 33px/1.5 Georgia, serif; color: #49684c; margin-top: 20px; }
.creator-signature span { display: inline-block; color: #d5af59; font-style: normal; font-size: 30px; transform: rotate(-15deg); margin-left: 15px; }
.creator-card { background: #fffefa; border: 1px solid #dedfd3; border-radius: 14px; padding: 27px 30px 20px; box-shadow: 0 15px 40px #334c3810; position: relative; }
.creator-card::before { content: ""; position: absolute; top: -10px; left: 43%; width: 65px; height: 22px; background: #ded7bb70; transform: rotate(-5deg); }
.creator-card-heading { display: flex; align-items: center; justify-content: space-between; gap: 10px; font: 9px Consolas, monospace; letter-spacing: 1.3px; color: var(--muted); }
.creator-badge { background: #edf3e8; color: #5c785c; padding: 6px 9px; font: 10px "Microsoft YaHei", sans-serif; letter-spacing: 0; border-radius: 4px; }
.creator-identity { display: flex; align-items: center; gap: 18px; padding: 26px 0; }
.creator-avatar { position: relative; width: 66px; height: 66px; flex: none; display: grid; place-items: center; border-radius: 50%; background: #e7edde; font: 28px Georgia, serif; color: #486446; }
.creator-avatar span { position: absolute; right: -2px; bottom: -3px; display: grid; place-items: center; width: 25px; height: 25px; background: #f1d282; border: 3px solid #fffefa; border-radius: 50%; font-size: 15px; }
.creator-identity h3 { font: 600 26px/1.4 Georgia, serif; margin: 0; }
.creator-identity p { margin: 4px 0 0; font-size: 11px; color: var(--muted); }
.contact-row { display: flex; align-items: center; gap: 15px; border-top: 1px solid #eaece3; padding-block: 18px; }
.contact-icon { flex: none; width: 32px; height: 32px; display: grid; place-items: center; border-radius: 8px; background: #f0f3ea; color: #6e8368; font-size: 15px; }
.contact-row > div { min-width: 0; }
.contact-label { display: block; font: 9px Consolas, monospace; color: var(--muted); letter-spacing: 1px; margin-bottom: 6px; }
.contact-row a { font: 16px/1.4 Consolas, monospace; overflow-wrap: anywhere; user-select: text; }
.contact-row a:hover { text-decoration: underline; text-underline-offset: 4px; }
.contact-row a span { color: #839579; margin-left: 9px; }
.planet-motto { position: relative; margin-top: 4px; padding: 20px; border-radius: 8px; background: #f4f2e7; }
.planet-motto blockquote { margin: 14px 0 0; padding-left: 14px; border-left: 2px solid #d9b966; color: #49644d; font-size: 14px; line-height: 2; }
.motto-star { position: absolute; bottom: 19px; right: 18px; color: #bd9848; font-size: 21px; }
.closing { text-align: center; padding-block: 50px 65px; }
.closing > span { color: #c7a54f; font-size: 29px; }
.closing h2 { margin: 15px 0 25px; font-size: clamp(22px, 3vw, 31px); }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-block: 25px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
.footer-brand { font-size: 13px; font-weight: 600; color: #49664d; }
.footer-brand span { font: 9px Consolas, monospace; letter-spacing: 1px; margin-left: 8px; }
.site-footer p { margin: 0; }
.site-footer a:hover { text-decoration: underline; text-underline-offset: 4px; }
@media (max-width: 900px) {
  .site-header { padding-inline: 28px; }
  .section-wrap { padding-inline: 28px; }
  .hero { gap: 12px; min-height: auto; padding-block: 45px; }
  .hero-description { font-size: 13px; }
  .hero .eyebrow { font-size: 8px; letter-spacing: .8px; }
  .hero-art .art-coordinate, .art-caption { font-size: 7px; letter-spacing: .8px; }
  .art-sticker { padding: 8px; font-size: 9px; }
  .art-row { gap: 3px; margin-bottom: 3px; }
  .art-row span { font-size: 8px; }
  .keyboard-art { padding: 10px 8px; }
  .course-grid { gap: 12px; }
  .course-card { padding: 20px; }
  .course-card h3 { font-size: 18px; }
  .course-tag { font-size: 9px; padding: 4px; }
  .creator-section { gap: 30px; }
  .creator-card { padding-inline: 20px; }
}
@media (max-width: 680px) {
  .site-header { padding: 20px; gap: 12px; }
  .brand { font-size: 17px; gap: 8px; }
  .brand-mark { width: 34px; height: 34px; font-size: 27px; border-radius: 9px; }
  .brand small { font-size: 8px; letter-spacing: 1.3px; }
  .site-header nav { gap: 16px; font-size: 12px; }
  .site-header nav > a:first-child { display: none; }
  .site-header .nav-start { padding: 9px 12px; }
  .nav-start span { margin-left: 4px; }
  .section-wrap { padding-inline: 22px; }
  .hero { grid-template-columns: 1fr; padding-block: 35px 40px; gap: 26px; }
  h1 { font-size: clamp(36px, 8.4vw, 52px); letter-spacing: -1.5px; }
  .hero .eyebrow { font-size: 9px; letter-spacing: 1px; }
  .hero-description { font-size: 14px; }
  .hero-art { width: min(100%, 410px); }
  .planet > span { font-size: 68px; }
  .benefit-strip { gap: 14px; padding-block: 23px; }
  .benefit-strip > div { display: block; text-align: center; padding-right: 5px; }
  .benefit-strip > div > span { display: block; margin-bottom: 10px; }
  .benefit-strip strong { font-size: 11px; }
  .benefit-strip small { font-size: 10px; line-height: 1.7; }
  .explore { padding-block: 55px; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 14px; }
  .course-grid { grid-template-columns: 1fr; gap: 16px; }
  .course-card { padding: 25px; }
  .card-top { margin-bottom: 22px; }
  .course-card h3 { font-size: 21px; }
  .course-tag { padding: 5px 10px; font-size: 11px; }
  .creator-section { grid-template-columns: 1fr; padding-block: 40px; gap: 35px; }
  .creator-card { padding-inline: 22px; }
  .contact-row { gap: 10px; }
  .contact-row a { font-size: 15px; }
  .closing { padding-block: 30px 50px; }
  .site-footer { flex-wrap: wrap; gap: 16px; }
  .footer-brand { flex-basis: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  .button { transition: none; }
  .button-primary:hover { transform: none; }
}