:root {
  --paper: #f4f1e9; --paper-bright: #fbfaf6; --ink: #112d38; --cinnabar: #d4552d;
  --teal: #2f6f6c; --line: rgba(17, 45, 56, .16); --muted-text: #627176;
  --background: var(--paper); --foreground: var(--ink); --card: var(--paper-bright); --card-foreground: var(--ink);
  --primary: var(--ink); --primary-foreground: var(--paper-bright); --secondary: #e8e3d6; --secondary-foreground: var(--ink);
  --muted: #e8e3d6; --muted-foreground: #627176; --accent: var(--cinnabar); --accent-foreground: #fff;
  --border: rgba(17, 45, 56, .16); --ring: var(--teal); --radius: .25rem;
}
.dark {
  --background: #0d242c; --foreground: #f4f1e9; --card: #15343f; --card-foreground: #f4f1e9;
  --primary: #f4f1e9; --primary-foreground: #112d38; --secondary: #21424b; --secondary-foreground: #f4f1e9;
  --muted: #21424b; --muted-foreground: #c6d0cf; --accent: #e76b42; --accent-foreground: #fff;
  --border: rgba(244, 241, 233, .18); --ring: #65aaa4;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px; -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
p { text-wrap: pretty; }
section[id] { scroll-margin-top: 88px; }
.site-header {
  position: absolute; z-index: 10; top: 0; left: 50%; width: min(1240px, calc(100% - 48px)); height: 86px;
  transform: translateX(-50%); display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
  border-bottom: 1px solid rgba(244, 241, 233, .28); color: var(--paper-bright);
}
.brand { display: inline-flex; align-items: center; gap: 12px; width: max-content; }
.brand-mark { width: 39px; height: 39px; display: grid; place-items: center; background: var(--cinnabar); color: #fff; font: 700 20px/1 "Songti SC", STSong, serif; }
.brand-name { display: flex; flex-direction: column; gap: 4px; font: 700 17px/1.05 "Songti SC", STSong, serif; letter-spacing: .12em; }
.brand-name small { font: 600 8px/1 sans-serif; letter-spacing: .21em; }
.top-brand { display: block; font-size: 16px; line-height: 1.3; letter-spacing: .07em; white-space: nowrap; }
.top-brand em { margin: 0 .22em; color: #efb576; font-style: normal; font-weight: 400; }
.site-header nav { display: flex; gap: 34px; font-size: 14px; }
.site-header nav a { opacity: .76; transition: opacity .2s ease; }
.site-header nav a:hover { opacity: 1; }
.header-cta { justify-self: end; padding: 10px 16px; border: 1px solid rgba(244,241,233,.45); font-size: 14px; }
.hero {
  position: relative; min-height: 810px; height: 100svh; max-height: 980px; overflow: hidden;
  display: grid; grid-template-columns: minmax(380px, .82fr) minmax(560px, 1.18fr); align-items: center; gap: 4vw;
  padding: 120px max(5vw, calc((100vw - 1240px)/2)) 92px; background: var(--ink); color: var(--paper-bright);
}
.hero::before { content: ""; position: absolute; inset: 0; opacity: .12; background-image: linear-gradient(rgba(255,255,255,.22) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.22) 1px, transparent 1px); background-size: 68px 68px; mask-image: linear-gradient(to right, #000, transparent 65%); }
.hero-copy { position: relative; z-index: 2; animation: rise .85s ease-out both; }
.kicker, .section-label, .mini-label { margin: 0; color: var(--cinnabar); font-size: 12px; font-weight: 700; letter-spacing: .2em; }
.hero h1, .section h2, .join h2 { margin: 28px 0 0; font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif; font-size: clamp(58px, 6vw, 92px); line-height: 1.06; letter-spacing: -.06em; }
.hero h1 em { color: #f0bd77; font-style: normal; }
.hero-lead { max-width: 550px; margin: 34px 0 0; color: rgba(251,250,246,.72); font-size: 18px; line-height: 1.9; }
.hero-actions { display: flex; align-items: center; gap: 30px; margin-top: 42px; }
.button { min-height: 52px; display: inline-flex; align-items: center; justify-content: center; gap: 32px; padding: 0 23px; border: 1px solid transparent; font-size: 15px; transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--cinnabar); color: #fff; }
.button-primary:hover { background: #e06439; }
.text-link { padding: 12px 0; border-bottom: 1px solid rgba(251,250,246,.35); font-size: 15px; }
.hero-visual { position: relative; z-index: 1; margin: 0; height: min(66vh, 660px); animation: fade 1s .15s ease-out both; }
.hero-visual::after { content: ""; position: absolute; inset: 0; box-shadow: inset 0 0 0 1px rgba(255,255,255,.17); pointer-events: none; }
.hero-visual img { width: 100%; height: 100%; object-fit: cover; object-position: 58% center; filter: saturate(.82) contrast(1.02); }
.hero-visual figcaption { position: absolute; left: -34px; bottom: 28px; padding: 16px 20px; background: var(--paper-bright); color: var(--ink); box-shadow: 0 20px 40px rgba(0,0,0,.22); font-size: 14px; }
.hero-visual figcaption strong { color: var(--cinnabar); font-family: Georgia, serif; font-size: 24px; }
.hero-visual figcaption i { margin: 0 8px; color: var(--muted-text); font-style: normal; }
.hero-foot { position: absolute; z-index: 2; left: max(5vw, calc((100vw - 1240px)/2)); bottom: 31px; display: flex; gap: 13px; color: rgba(251,250,246,.48); font-family: "Songti SC", STSong, serif; letter-spacing: .14em; }
.hero-foot i { color: var(--cinnabar); font-style: normal; }
.section { padding: 124px max(6vw, calc((100vw - 1160px)/2)); }
.section-label { display: flex; align-items: center; gap: 14px; color: var(--muted-text); }
.section-label span { color: var(--cinnabar); font-family: Georgia, serif; font-size: 13px; }
.section-label.light { color: rgba(251,250,246,.55); }
.idea { background: var(--paper-bright); }
.idea-grid { margin-top: 62px; display: grid; grid-template-columns: 1.1fr .9fr; gap: 9%; }
.section h2 { color: var(--ink); font-size: clamp(42px, 5vw, 70px); }
.idea-copy { padding-top: 10px; }
.idea-copy > p { margin: 0; color: var(--muted-text); font-size: 19px; line-height: 1.9; }
blockquote { margin: 46px 0 0; padding-left: 22px; border-left: 3px solid var(--cinnabar); color: var(--ink); font: 700 25px/1.7 "Songti SC", STSong, serif; }
.values-row { margin-top: 88px; display: grid; grid-template-columns: repeat(3,1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.values-row article { padding: 34px 32px 38px; border-right: 1px solid var(--line); }
.values-row article:last-child { border: 0; }
.values-row article > span { color: var(--cinnabar); font: 13px Georgia, serif; }
.values-row h3 { margin: 38px 0 11px; font: 700 33px/1 "Songti SC", STSong, serif; }
.values-row p { margin: 0; color: var(--muted-text); font-size: 14px; }
.learning { background: var(--ink); color: var(--paper-bright); }
.learning-head { margin-top: 58px; display: grid; grid-template-columns: 1.2fr .8fr; align-items: end; gap: 10%; }
.learning .learning-head h2 { color: var(--paper-bright); margin: 0; }
.learning-head > p { margin: 0 0 5px; color: rgba(251,250,246,.65); font-size: 18px; line-height: 1.85; }
.steps { margin-top: 76px; display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid rgba(251,250,246,.2); }
.steps article { min-height: 270px; padding: 28px 28px 34px 0; border-right: 1px solid rgba(251,250,246,.18); }
.steps article:not(:first-child) { padding-left: 28px; }
.steps article:last-child { border: 0; }
.steps span { color: #efb576; font: 14px Georgia, serif; }
.steps h3 { margin: 55px 0 16px; font: 700 23px/1.35 "Songti SC", STSong, serif; }
.steps p { margin: 0; color: rgba(251,250,246,.58); font-size: 15px; line-height: 1.75; }
.ai-principle { margin-top: 72px; padding: 50px; display: grid; grid-template-columns: 150px 1fr 1fr; gap: 6%; align-items: center; background: #e9dfca; color: var(--ink); }
.ai-orbit { position: relative; width: 128px; aspect-ratio: 1; display: grid; place-items: center; border: 1px solid rgba(17,45,56,.22); border-radius: 50%; }
.ai-orbit::before { content: ""; position: absolute; width: 82px; aspect-ratio: 1; border: 1px solid var(--cinnabar); border-radius: 50%; }
.ai-orbit span { z-index: 1; font: 700 24px Georgia, serif; }
.ai-principle h3 { margin: 19px 0 0; font: 700 33px/1.45 "Songti SC", STSong, serif; }
.ai-principle > p { margin: 0; color: #52646a; line-height: 1.85; }
.teachers { background: var(--paper); }
.teachers-head { margin-top: 58px; display: flex; align-items: end; justify-content: space-between; gap: 8%; }
.teachers-head h2 { margin: 0; }
.teachers-head p { max-width: 440px; margin: 0 0 4px; color: var(--muted-text); font-size: 18px; line-height: 1.85; }
.teacher-list { margin-top: 74px; border-top: 1px solid var(--line); }
.teacher-list article { min-height: 156px; display: grid; grid-template-columns: 70px 88px 1fr 1.2fr; align-items: center; gap: 24px; border-bottom: 1px solid var(--line); }
.teacher-number { color: var(--muted-text); font: 13px Georgia, serif; }
.teacher-seal { width: 66px; height: 66px; display: grid; place-items: center; border: 1px solid var(--cinnabar); color: var(--cinnabar); font: 700 27px "Songti SC", STSong, serif; }
.teacher-list h3 { margin: 0; font: 700 29px "Songti SC", STSong, serif; }
.teacher-list div p { margin: 10px 0 0; color: var(--teal); font-size: 14px; }
.teacher-note { margin: 0; color: var(--muted-text); line-height: 1.75; }
.teacher-list .teacher-feature { grid-template-columns: 70px 88px 1fr 1.2fr; background: none; }
.teacher-avatar { width: 52px; height: 52px; object-fit: cover; border-radius: 50%; border: 1px solid rgba(212,85,45,.26); box-shadow: 0 6px 16px rgba(17,45,56,.1); }
.teacher-feature h3 small { margin-left: 8px; color: var(--muted-text); font: 500 13px/1 sans-serif; letter-spacing: .03em; }
.teacher-summary { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.teacher-summary .teacher-note { margin: 0; color: var(--muted-text); font-size: 14px; line-height: 1.65; }
.profile-link { width: max-content; margin-top: 0; display: inline-flex; align-items: center; gap: 14px; padding-bottom: 4px; border-bottom: 1px solid var(--cinnabar); color: var(--ink); font-size: 14px; }
.scale { background: #d85a32; color: #fff; }
.scale-grid { margin-top: 66px; display: grid; grid-template-columns: 1fr 1fr; gap: 8%; align-items: end; }
.scale .section-label span, .scale .section-label { color: rgba(255,255,255,.76); }
.scale-number { margin: 0; font: 700 clamp(100px, 14vw, 180px)/.75 Georgia, serif; letter-spacing: -.08em; }
.scale-number small { margin-left: 22px; font: 500 17px sans-serif; letter-spacing: .06em; }
.scale h2 { color: #fff; font-size: clamp(39px, 4vw, 58px); line-height: 1.25; }
.nine-seats { display: grid; grid-template-columns: repeat(3,1fr); border-top: 1px solid rgba(255,255,255,.45); border-left: 1px solid rgba(255,255,255,.45); }
.nine-seats span { aspect-ratio: 1.5; display: flex; align-items: flex-end; justify-content: flex-end; padding: 14px; border-right: 1px solid rgba(255,255,255,.45); border-bottom: 1px solid rgba(255,255,255,.45); color: rgba(255,255,255,.8); font: 13px Georgia, serif; }
.nine-seats span:nth-child(5) { background: #fff; color: var(--cinnabar); }
.scale-note { max-width: 760px; margin: 70px 0 0 auto; padding-top: 26px; border-top: 1px solid rgba(255,255,255,.35); font-size: 18px; line-height: 1.85; }
.join { text-align: center; background: var(--paper-bright); }
.join .kicker { color: var(--teal); }
.join h2 { color: var(--ink); font-size: clamp(45px, 6vw, 76px); }
.join > p:not(.kicker) { max-width: 650px; margin: 30px auto 0; color: var(--muted-text); font-size: 18px; line-height: 1.8; }
.button-light { margin-top: 40px; background: var(--ink); color: var(--paper-bright); }
.button-light:hover { background: var(--cinnabar); }
footer { min-height: 180px; padding: 52px max(5vw, calc((100vw - 1240px)/2)); display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; background: var(--ink); color: var(--paper-bright); }
footer > p { color: rgba(251,250,246,.62); letter-spacing: .13em; }
footer > small { justify-self: end; color: rgba(251,250,246,.4); }
@keyframes rise { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
@media (max-width: 960px) {
  .site-header { grid-template-columns: 1fr auto; } .site-header nav { display: none; }
  .hero { height: auto; max-height: none; grid-template-columns: 1fr; padding-top: 150px; }
  .hero-visual { height: min(62vw, 560px); } .hero-foot { display: none; }
  .idea-grid, .learning-head, .scale-grid { grid-template-columns: 1fr; }
  .idea-copy { max-width: 640px; margin-top: 30px; } .learning-head > p { max-width: 600px; margin-top: 28px; }
  .steps { grid-template-columns: repeat(2,1fr); } .steps article:nth-child(2) { border-right: 0; }
  .steps article:nth-child(3), .steps article:nth-child(4) { border-top: 1px solid rgba(251,250,246,.18); }
  .ai-principle { grid-template-columns: 120px 1fr; } .ai-principle > p { grid-column: 2; }
  .teacher-list article { grid-template-columns: 52px 72px 1fr; padding: 26px 0; } .teacher-note { grid-column: 3; }
  .teacher-list .teacher-feature { grid-template-columns: 52px 72px 1fr; padding: 26px 0; }
  .teacher-avatar { width: 52px; height: 52px; }
  .teacher-summary { grid-column: 3; }
  .nine-seats { margin-top: 30px; } footer { grid-template-columns: 1fr auto; } footer > p { display: none; }
}
@media (max-width: 640px) {
  .site-header { width: calc(100% - 32px); height: 72px; } .brand-mark { width: 35px; height: 35px; } .header-cta { display: none; }
  .top-brand { font-size: 13px; letter-spacing: .025em; }
  .hero { min-height: 0; padding: 118px 20px 66px; } .hero h1 { font-size: clamp(48px, 14vw, 68px); } .hero-lead { font-size: 17px; }
  .hero-actions { align-items: stretch; flex-direction: column; gap: 12px; } .text-link { width: max-content; }
  .hero-visual { height: 72vw; min-height: 290px; margin-top: 8px; } .hero-visual figcaption { left: 12px; bottom: 12px; }
  .section { padding: 88px 20px; } .idea-grid, .learning-head, .teachers-head { margin-top: 44px; } .section h2 { font-size: 43px; }
  .idea-copy > p, .learning-head > p, .teachers-head p, .join > p:not(.kicker), .scale-note { font-size: 17px; }
  .values-row { grid-template-columns: 1fr; margin-top: 60px; } .values-row article { border-right: 0; border-bottom: 1px solid var(--line); } .values-row article:last-child { border-bottom: 0; }
  .steps { grid-template-columns: 1fr; } .steps article, .steps article:not(:first-child) { min-height: auto; padding: 26px 0 30px; border-right: 0; border-bottom: 1px solid rgba(251,250,246,.18); }
  .steps article:nth-child(3), .steps article:nth-child(4) { border-top: 0; } .steps h3 { margin-top: 28px; }
  .ai-principle { padding: 32px 24px; grid-template-columns: 1fr; } .ai-orbit { width: 96px; } .ai-principle > p { grid-column: 1; }
  .teachers-head { align-items: start; flex-direction: column; } .teacher-list { margin-top: 50px; }
  .teacher-list article { grid-template-columns: 42px 64px 1fr; gap: 14px; } .teacher-seal { width: 56px; height: 56px; } .teacher-note { grid-column: 2 / -1; }
  .teacher-list .teacher-feature { grid-template-columns: 42px 64px 1fr; gap: 14px; padding: 26px 0; }
  .teacher-avatar { width: 46px; height: 46px; }
  .teacher-summary { grid-column: 2 / -1; }
  .scale-number { font-size: 112px; } .scale h2 { font-size: 39px; } .nine-seats span { aspect-ratio: 1.2; } .scale-note { margin-top: 50px; }
  footer { padding: 42px 20px; grid-template-columns: 1fr; gap: 32px; } footer > small { justify-self: start; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; } *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}