:root {
  --ink: #10182b;
  --muted: #526079;
  --line: #dce3ee;
  --paper: #ffffff;
  --mist: #f2f5fb;
  --lavender: #f1efff;
  --navy: #08152e;
  --blue: #2164ef;
  --cyan: #00b8c8;
  --violet: #7654e8;
  --mint: #44d2a3;
  --amber: #f2ad3c;
  --shadow: 0 18px 45px rgba(24, 39, 77, 0.1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; font-size: 16px; line-height: 1.7; }
button, a { font: inherit; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { cursor: pointer; }

.container { width: min(1200px, calc(100% - 48px)); margin: 0 auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255, 255, 255, 0.96); border-bottom: 1px solid #edf0f5; }
.navigation { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: block; width: 222px; flex: 0 0 auto; }
.brand img { width: 100%; height: auto; }
.main-nav { display: flex; align-items: center; gap: 28px; font-weight: 700; color: #1c2b43; }
.main-nav a { position: relative; padding: 26px 0; white-space: nowrap; font-size: 15px; }
.main-nav a::after { content: ""; position: absolute; height: 2px; left: 0; right: 0; bottom: 17px; background: var(--blue); transform: scaleX(0); transform-origin: left; transition: transform 0.2s ease; }
.main-nav a:hover::after, .main-nav a:focus-visible::after { transform: scaleX(1); }
.menu-toggle { display: none; width: 42px; height: 40px; padding: 9px; border: 1px solid var(--line); border-radius: 6px; background: #fff; }
.menu-toggle span { display: block; height: 2px; margin: 4px 0; background: var(--ink); }

.hero { min-height: 686px; color: #fff; background: #080b1d url("assets/generated/hero-llm.png") center / cover no-repeat; }
.hero-content { min-height: 686px; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; padding: 72px 0 60px; }
.eyebrow { margin: 0 0 10px; color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: 0; line-height: 1.2; text-transform: uppercase; }
.eyebrow.light { color: #91e7e4; }
h1, h2, h3, h4, p { margin-top: 0; }
h1 { max-width: 770px; margin-bottom: 16px; font-size: clamp(48px, 6.4vw, 82px); line-height: 1.08; letter-spacing: 0; }
h2 { margin-bottom: 18px; font-size: clamp(32px, 4vw, 52px); line-height: 1.16; letter-spacing: 0; }
h3 { font-size: 22px; line-height: 1.32; letter-spacing: 0; }
.hero-subtitle { max-width: 638px; margin: 0; color: #dce7ff; font-size: 21px; line-height: 1.65; }
.hero-actions { display: flex; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 12px 20px; border: 1px solid transparent; border-radius: 6px; font-weight: 800; line-height: 1.2; transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease; }
.button span { margin-left: 9px; }
.button:hover, .button:focus-visible { transform: translateY(-2px); }
.button.primary { color: #07122c; background: #8ff0d9; box-shadow: 0 10px 22px rgba(68, 210, 163, 0.22); }
.button.secondary { color: #fff; background: rgba(7, 13, 35, 0.4); border-color: rgba(255, 255, 255, 0.5); }
.button.outline { color: var(--ink); background: transparent; border-color: #8390a8; }
.button.light-button { color: var(--ink); background: #fff; }
.hero-stats { display: flex; gap: 34px; margin: 44px 0 0; }
.hero-stats div { display: flex; align-items: baseline; gap: 8px; }
.hero-stats dt { color: #8ff0d9; font-size: 30px; font-weight: 900; line-height: 1; }
.hero-stats dd { margin: 0; color: #e2eaff; font-weight: 700; font-size: 14px; }

.section { padding: 108px 0; }
.intro { background: #fff; }
.split-layout { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(310px, 0.75fr); gap: 92px; align-items: center; }
.lead { color: #334461; font-size: 21px; line-height: 1.72; }
.intro p:not(.eyebrow), .group-layout p:not(.eyebrow) { color: var(--muted); }
.text-action { display: inline-flex; align-items: center; gap: 9px; margin-top: 14px; color: var(--blue); font-weight: 800; }
.text-action:hover, .text-action:focus-visible { color: var(--violet); }
.assurance-panel { padding: 33px 34px; color: #e9f0ff; background: var(--navy); border-radius: 8px; box-shadow: var(--shadow); }
.panel-label { margin-bottom: 21px; color: #91e7e4; font-size: 12px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
.check-list { display: grid; gap: 17px; margin: 0; padding: 0; list-style: none; }
.check-list li { position: relative; padding-left: 25px; font-weight: 600; }
.check-list li::before { content: "+"; position: absolute; left: 0; color: #8ff0d9; font-size: 18px; font-weight: 900; }

.advantages { background: var(--mist); }
.section-heading { margin-bottom: 42px; }
.compact-heading { display: flex; align-items: end; justify-content: space-between; gap: 48px; }
.compact-heading h2, .centered h2 { margin-bottom: 0; }
.compact-heading > p { max-width: 465px; margin: 0; color: var(--muted); }
.centered { max-width: 760px; margin-right: auto; margin-left: auto; text-align: center; }
.centered > p:not(.eyebrow) { margin: 15px 0 0; color: var(--muted); }
.advantage-grid { display: grid; grid-template-columns: repeat(5, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.advantage-card { min-height: 252px; padding: 25px 23px; background: #fff; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.advantage-card:nth-child(2) { background: #eefbfb; }
.advantage-card:nth-child(3) { background: #f4f1ff; }
.advantage-card:nth-child(4) { background: #fff8ea; }
.advantage-card:nth-child(5) { background: #f1f7ff; }
.number, .teacher-code, .story-index, .project-mini span, .project-feature span { display: block; color: var(--blue); font-size: 13px; font-weight: 900; letter-spacing: 0; }
.advantage-card h3 { margin: 38px 0 14px; font-size: 20px; }
.advantage-card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.66; }

.role-section { color: #fff; background: #12183a; }
.role-layout { display: grid; grid-template-columns: minmax(300px, 0.85fr) minmax(0, 1.15fr); gap: 94px; align-items: center; }
.role-copy p:not(.eyebrow) { max-width: 430px; color: #cbd7ef; font-size: 19px; }
.role-copy .button { margin-top: 17px; color: #fff; border-color: #8aa0ce; }
.skill-list { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255, 255, 255, 0.2); }
.skill-list li { display: grid; grid-template-columns: 150px 1fr; gap: 24px; padding: 18px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.2); }
.skill-list strong { color: #95edda; }
.skill-list span { color: #e5ebfa; line-height: 1.62; }

.faq-section { background: #fff; }
.faq-layout { align-items: start; }
.faq-layout p:not(.eyebrow) { max-width: 440px; color: var(--muted); }
.faq-list { border-top: 1px solid var(--line); }
.faq-list a { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 18px 0; font-size: 18px; font-weight: 700; border-bottom: 1px solid var(--line); transition: color 0.2s ease, padding-left 0.2s ease; }
.faq-list a:hover, .faq-list a:focus-visible { padding-left: 12px; color: var(--blue); }
.faq-list b { color: var(--violet); font-size: 13px; }

.career-section { background: var(--lavender); }
.career-table { overflow: hidden; margin-top: 43px; border: 1px solid #d9d2fa; border-radius: 8px; background: #fff; }
.career-head, .career-row { display: grid; grid-template-columns: 1.1fr 0.8fr 2fr; gap: 24px; align-items: center; padding: 19px 24px; }
.career-head { color: #fff; background: #372a78; font-size: 14px; font-weight: 800; }
.career-row { min-height: 91px; border-top: 1px solid #e8e5f6; }
.career-row:nth-child(odd) { background: #fbfaff; }
.career-row strong { font-size: 18px; }
.career-row span, .career-row p { color: var(--muted); }
.career-row p { margin: 0; }
.fine-print { margin: 16px 0 0; color: #657089; font-size: 13px; }

.stories { background: #fff; }
.story-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.story-card { min-height: 285px; padding: 24px; background: #f6f8fc; border-top: 3px solid #86a8ff; }
.story-card:nth-child(2), .story-card:nth-child(6) { background: #effbf8; border-color: #48c9a4; }
.story-card:nth-child(3), .story-card:nth-child(7) { background: #fff7ea; border-color: #eeb14d; }
.story-card:nth-child(4), .story-card:nth-child(8) { background: #f5f1ff; border-color: #9d82ff; }
.story-person { display: flex; align-items: center; gap: 15px; margin-bottom: 18px; }
.story-person img { width: 70px; height: 70px; flex: 0 0 70px; object-fit: cover; border: 3px solid #fff; border-radius: 50%; box-shadow: 0 5px 15px rgba(24, 39, 77, 0.14); }
.story-card h3 { margin: 5px 0 0; font-size: 20px; }
.story-card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.68; }

.audience-section { background: var(--mist); }
.audience-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.audience-grid article { min-height: 265px; padding: 26px 25px; background: #fff; border-radius: 8px; box-shadow: 0 7px 20px rgba(24, 39, 77, 0.06); }
.audience-grid article:nth-child(2) span { color: var(--violet); }
.audience-grid article:nth-child(3) span { color: #d88020; }
.audience-grid article:nth-child(4) span { color: #049886; }
.audience-grid h3 { margin: 39px 0 14px; font-size: 21px; }
.audience-grid p { margin: 0; color: var(--muted); font-size: 15px; }

.projects { color: #fff; background: #0a1a32; }
.projects .compact-heading > p { color: #c0d2e9; }
.project-gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; align-items: start; }
.project-case { margin: 0; overflow: hidden; border: 1px solid rgba(164, 196, 255, 0.24); border-radius: 8px; background: #fff; }
.project-case a { display: block; overflow: hidden; background: #fff; }
.project-case img { width: 100%; height: auto; transition: transform 0.25s ease; }
.project-case a:hover img, .project-case a:focus-visible img { transform: scale(1.012); }
.project-case figcaption { display: flex; align-items: center; gap: 12px; min-height: 60px; padding: 13px 18px; color: #e8f0ff; background: #102446; font-size: 16px; font-weight: 800; }
.project-case figcaption span { color: #8ff0d9; font-size: 13px; }
.projects .text-action { margin-top: 30px; color: #91e7e4; }

.group-section { background: #fff; }
.group-layout { display: grid; grid-template-columns: 285px 1fr; gap: 92px; align-items: center; }
.group-mark { min-height: 250px; display: flex; flex-direction: column; justify-content: space-between; padding: 26px; color: #fff; background: #1667b8; border-radius: 8px; }
.group-mark span { color: #b9ffec; font-size: 20px; font-weight: 900; }
.group-mark b { font-size: 31px; line-height: 1.15; letter-spacing: 0; }

.partner-section { padding-top: 82px; padding-bottom: 82px; background: #f9fafc; }
.partner-logo-wall { margin-top: 35px; padding: 28px 24px; background: #fff; border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 8px 24px rgba(24, 39, 77, 0.06); }
.partner-logo-wall img { width: 100%; height: auto; }

.teachers { background: #fff; }
.teacher-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.teacher-card { min-height: 310px; padding: 26px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.teacher-card:nth-child(2), .teacher-card:nth-child(5) { background: #f2f9ff; }
.teacher-card:nth-child(3), .teacher-card:nth-child(6) { background: #f5f2ff; }
.teacher-head { display: flex; align-items: center; gap: 17px; margin-bottom: 19px; }
.teacher-head img { width: 84px; height: 84px; flex: 0 0 84px; object-fit: cover; border: 3px solid #fff; border-radius: 50%; box-shadow: 0 6px 18px rgba(24, 39, 77, 0.13); }
.teacher-code { color: var(--violet); }
.teacher-card h3 { margin: 5px 0 0; }
.teacher-card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.7; }

.curriculum { background: var(--mist); }
.curriculum-shell { overflow: hidden; border: 1px solid #d6e0ee; border-radius: 8px; background: #fff; }
.phase-panels { padding: 0 38px; }
.phase-panel { display: block; padding: 42px 0; border-bottom: 1px solid #dce3ee; }
.phase-panel:last-child { border-bottom: 0; }
.phase-label { margin-bottom: 8px; color: var(--violet); font-size: 13px; font-weight: 900; letter-spacing: 0; text-transform: uppercase; }
.phase-panel h3 { margin-bottom: 28px; font-size: 30px; }
.syllabus-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.syllabus-grid article { min-height: 135px; padding: 20px 20px; border-left: 3px solid #4d83f3; background: #f7faff; }
.syllabus-grid article:nth-child(even) { border-left-color: #7c5de4; background: #faf8ff; }
.syllabus-grid h4 { margin: 0 0 9px; font-size: 18px; line-height: 1.32; }
.syllabus-grid p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.68; }

.contact-band { color: #fff; background: #1a2582; }
.contact-layout { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 90px; padding: 88px 0; align-items: center; }
.contact-band h2 { max-width: 670px; }
.contact-band p:not(.eyebrow) { max-width: 550px; color: #dbe4ff; }
.contact-details { display: grid; gap: 17px; margin: 0; }
.contact-details div { padding-bottom: 16px; border-bottom: 1px solid rgba(255, 255, 255, 0.26); }
.contact-details dt { margin-bottom: 3px; color: #91e7e4; font-size: 13px; font-weight: 900; }
.contact-details dd { margin: 0; color: #f7f9ff; }

.site-footer { color: #c8d3e6; background: #071126; }
.footer-grid { display: grid; grid-template-columns: 1.1fr 1.2fr 0.7fr; gap: 80px; padding: 57px 0 38px; }
.site-footer h2 { margin-bottom: 15px; color: #fff; font-size: 19px; }
.site-footer a, .site-footer p { display: block; margin: 8px 0; color: #c8d3e6; font-size: 14px; }
.site-footer a:hover, .site-footer a:focus-visible { color: #91e7e4; }
.qr-block img { width: 125px; padding: 6px; background: #fff; border-radius: 5px; }
.footer-bottom { position: relative; display: flex; align-items: center; justify-content: center; min-height: 78px; padding-right: 70px; border-top: 1px solid rgba(255, 255, 255, 0.14); }
.footer-bottom p { margin: 0; text-align: center; }
.footer-bottom p a { display: inline; }
.back-to-top { position: absolute; right: 0; width: 44px; height: 44px; color: #fff; border: 0; border-radius: 50%; background: #196ac3; font-size: 22px; line-height: 1; }
.back-to-top:hover, .back-to-top:focus-visible { background: #2d89e5; }

@media (max-width: 1050px) {
  .main-nav { gap: 18px; }
  .main-nav a { font-size: 14px; }
  .advantage-grid { grid-template-columns: repeat(3, 1fr); }
  .story-grid { grid-template-columns: repeat(3, 1fr); }
  .audience-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-strip { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 820px) {
  .container { width: min(100% - 36px, 640px); }
  .navigation { min-height: 66px; }
  .brand { width: 183px; }
  .menu-toggle { display: block; }
  .main-nav { display: none; position: absolute; top: 66px; left: 0; right: 0; padding: 10px 18px 18px; flex-direction: column; align-items: stretch; gap: 0; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 12px 22px rgba(24, 39, 77, 0.08); }
  .main-nav.is-open { display: flex; }
  .main-nav a { padding: 12px 0; }
  .main-nav a::after { display: none; }
  .hero, .hero-content { min-height: 625px; }
  .hero { background-position: 62% center; }
  .hero-content { padding-top: 85px; justify-content: flex-start; }
  h1 { margin-top: 38px; font-size: 54px; }
  .hero-subtitle { font-size: 18px; }
  .hero-stats { flex-wrap: wrap; gap: 17px 23px; margin-top: 36px; }
  .section { padding: 74px 0; }
  .split-layout, .role-layout, .group-layout, .contact-layout { grid-template-columns: 1fr; gap: 40px; }
  .compact-heading { display: block; }
  .compact-heading > p { margin-top: 16px; }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .advantage-card { min-height: 220px; }
  .career-head, .career-row { grid-template-columns: 1.1fr 0.85fr 1.7fr; gap: 13px; padding: 16px; }
  .story-grid { grid-template-columns: repeat(2, 1fr); }
  .project-gallery { grid-template-columns: 1fr; }
  .teacher-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { gap: 38px; grid-template-columns: 1fr 1.1fr 0.6fr; }
}

@media (max-width: 560px) {
  body { font-size: 15px; }
  .container { width: min(100% - 30px, 480px); }
  .brand { width: 171px; }
  .hero, .hero-content { min-height: 590px; }
  .hero { background-position: 59% center; }
  h1 { margin-top: 27px; font-size: 43px; }
  h2 { font-size: 34px; }
  .hero-subtitle { max-width: 330px; font-size: 16px; }
  .hero-actions { flex-wrap: wrap; }
  .hero-actions .button { width: 100%; }
  .hero-stats dt { font-size: 25px; }
  .hero-stats dd { font-size: 12px; }
  .lead { font-size: 18px; }
  .assurance-panel { padding: 26px 23px; }
  .advantage-grid, .story-grid, .audience-grid, .teacher-grid, .syllabus-grid { grid-template-columns: 1fr; }
  .advantage-card { min-height: auto; }
  .skill-list li { grid-template-columns: 1fr; gap: 5px; }
  .faq-list a { font-size: 16px; }
  .career-table { overflow-x: auto; }
  .career-head, .career-row { min-width: 620px; }
  .project-feature, .project-feature img { min-height: 350px; height: 350px; }
  .group-mark { min-height: 180px; }
  .partner-strip { grid-template-columns: repeat(2, 1fr); }
  .phase-panels { padding: 25px 18px; }
  .phase-panel { padding: 32px 0; }
  .phase-panel h3 { font-size: 26px; }
  .contact-layout { padding: 68px 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { justify-content: flex-start; padding: 18px 60px 18px 0; }
  .footer-bottom p { text-align: left; }
}