:root {
  --navy: #102c46;
  --navy-2: #173a58;
  --blue: #3d7598;
  --orange: #ee762d;
  --cream: #f6efe3;
  --paper: #fbf8f2;
  --ink: #142536;
  --muted: #687683;
  --line: rgba(16, 44, 70, 0.14);
  --green: #627b5a;
  --white: #fff;
  --shadow: 0 24px 70px rgba(12, 35, 54, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif; color: var(--ink); background: var(--paper); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; }
.shell { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.section { padding: 112px 0; }
.eyebrow { margin: 0 0 18px; font-size: 12px; letter-spacing: .2em; font-weight: 800; color: var(--orange); text-transform: uppercase; }
.eyebrow.light { color: #f2a36d; }
h1, h2, h3, p { margin-top: 0; }
h1, h2 { font-family: "Songti SC", "STSong", "Noto Serif CJK SC", serif; letter-spacing: -.035em; }
h2 { margin-bottom: 0; font-size: clamp(38px, 5vw, 66px); line-height: 1.08; font-weight: 700; }
.section-heading { margin-bottom: 64px; }
.section-heading.centered { text-align: center; }
.section-heading.centered h2 { max-width: 800px; margin-inline: auto; }
.split-heading { display: grid; grid-template-columns: 1.2fr .8fr; gap: 80px; align-items: end; }
.split-heading > p { margin: 0; max-width: 510px; font-size: 17px; line-height: 1.9; color: var(--muted); }
.split-heading.inverse > p { color: rgba(255,255,255,.72); }

.site-header { position: fixed; inset: 0 0 auto; height: 78px; z-index: 30; background: rgba(251, 248, 242, .94); border-bottom: 1px solid rgba(16,44,70,.08); backdrop-filter: blur(18px); }
.nav-shell { height: 100%; width: min(1280px, calc(100% - 40px)); margin: auto; display: flex; align-items: center; gap: 38px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--navy); }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 50%; background: var(--navy); color: var(--cream); flex: 0 0 auto; }
.brand-mark svg { width: 23px; height: 23px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linejoin: round; }
.brand strong { display: block; font-size: 16px; letter-spacing: .06em; }
.brand small { display: block; margin-top: 3px; font-size: 8px; letter-spacing: .13em; color: #6e7881; }
.main-nav { display: flex; gap: 28px; margin-left: auto; }
.main-nav a { position: relative; padding: 28px 0; font-size: 14px; color: #34485a; }
.main-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 19px; height: 2px; background: var(--orange); transition: right .25s ease; }
.main-nav a:hover::after { right: 0; }
.button { min-height: 52px; padding: 0 25px; display: inline-flex; align-items: center; justify-content: center; border-radius: 999px; font-size: 14px; font-weight: 750; letter-spacing: .03em; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-small { min-height: 42px; padding: 0 20px; color: white; background: var(--navy); }
.button-primary { color: white; background: var(--orange); box-shadow: 0 15px 30px rgba(238,118,45,.28); }
.button-ghost { color: white; border: 1px solid rgba(255,255,255,.52); background: rgba(15,38,57,.18); }
.button-light { background: var(--cream); color: var(--navy); }
.menu-toggle { display: none; width: 42px; height: 42px; border: 0; background: transparent; padding: 10px; margin-left: auto; }
.menu-toggle span { display: block; height: 2px; background: var(--navy); margin: 7px 0; }

.hero { min-height: 840px; padding-top: 78px; position: relative; display: grid; align-items: center; overflow: hidden; color: white; background: var(--navy); }
.hero-media, .hero-shade { position: absolute; inset: 0; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: 55% center; }
.hero-shade { background: linear-gradient(90deg, rgba(7,28,45,.96) 0%, rgba(7,28,45,.82) 42%, rgba(7,28,45,.18) 77%, rgba(7,28,45,.05) 100%); }
.hero-content { position: relative; z-index: 2; padding-top: 45px; }
.hero h1 { max-width: 850px; margin-bottom: 28px; font-size: clamp(52px, 6.8vw, 92px); line-height: 1.04; font-weight: 700; }
.hero-lead { max-width: 660px; font-size: 19px; line-height: 1.9; color: rgba(255,255,255,.82); }
.hero-actions { display: flex; gap: 14px; margin-top: 38px; }
.hero-proof { display: flex; gap: 1px; width: min(650px, 100%); margin-top: 74px; border-top: 1px solid rgba(255,255,255,.28); }
.hero-proof div { flex: 1; padding: 20px 24px 0 0; }
.hero-proof strong { display: block; font-family: Georgia, serif; font-size: 30px; color: #f4b082; }
.hero-proof span { display: block; margin-top: 6px; font-size: 12px; letter-spacing: .08em; color: rgba(255,255,255,.65); }

.belief-strip { padding: 80px 0; background: var(--cream); border-bottom: 1px solid var(--line); }
.belief-grid { display: grid; grid-template-columns: 240px 1fr; gap: 50px; }
.belief-grid blockquote { margin: 0; font-family: "Songti SC", serif; font-size: clamp(30px, 4vw, 48px); line-height: 1.5; color: var(--navy); }

.problem-section { background: #fff; }
.problem-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.problem-grid article { padding: 40px 38px 42px 0; border-right: 1px solid var(--line); }
.problem-grid article + article { padding-left: 38px; }
.problem-grid article:last-child { border-right: 0; }
.problem-grid span, .principles-list > article > span { font-family: Georgia, serif; font-size: 13px; color: var(--orange); }
.problem-grid h3 { margin: 38px 0 14px; font-size: 24px; }
.problem-grid p { margin: 0; line-height: 1.8; color: var(--muted); }

.principles-section { background: var(--paper); }
.principles-list { max-width: 980px; margin: 0 auto; border-top: 1px solid var(--line); }
.principles-list article { display: grid; grid-template-columns: 100px 1fr; padding: 28px 0; border-bottom: 1px solid var(--line); }
.principles-list h3 { margin: 0 0 7px; font-size: 22px; }
.principles-list p { margin: 0; color: var(--muted); line-height: 1.75; }

.track-section { color: white; background: var(--navy); }
.track-grid { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid rgba(255,255,255,.25); }
.track-card { min-height: 515px; padding: 50px; display: flex; flex-direction: column; }
.track-card + .track-card { border-left: 1px solid rgba(255,255,255,.22); }
.textbook-track { color: var(--ink); background: var(--cream); }
.track-no { margin-bottom: 18px; font: 700 12px/1.4 ui-monospace, monospace; letter-spacing: .12em; color: #f4a36c; }
.textbook-track .track-no { color: var(--orange); }
.track-card h3 { margin: 0; font: 700 clamp(48px,6vw,76px)/1.05 "Songti SC", serif; }
.track-sub { margin-top: 18px; font-size: 19px; }
.track-card ul { margin: auto 0 0; padding: 0; list-style: none; }
.track-card li { padding: 13px 0; border-top: 1px solid currentColor; font-size: 17px; opacity: .92; }
.course-tags { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 28px; }
.course-tags span { padding: 9px 14px; border: 1px solid rgba(255,255,255,.25); border-radius: 999px; font-size: 12px; color: rgba(255,255,255,.75); }

.path-section { background: #fff; }
.stage-tabs { display: grid; grid-template-columns: repeat(7, 1fr); gap: 8px; }
.stage-tab { min-height: 116px; padding: 16px 12px; border: 1px solid var(--line); background: #f4f3ef; color: #4f5b65; text-align: left; cursor: pointer; transition: .2s ease; }
.stage-tab span { display: block; margin-bottom: 26px; font: 12px ui-monospace, monospace; color: #8d969c; }
.stage-tab:hover, .stage-tab.active { color: white; background: var(--navy); transform: translateY(-3px); }
.stage-tab.active span { color: #f4a36c; }
.stage-detail { margin-top: 20px; padding: 45px 48px; display: grid; grid-template-columns: .65fr 1.35fr .75fr; gap: 46px; align-items: center; background: var(--cream); border-left: 5px solid var(--orange); }
.stage-kicker { margin-bottom: 8px; font-size: 11px; letter-spacing: .12em; color: var(--orange); }
.stage-detail h3 { margin: 0; font-size: 28px; }
.stage-detail > p { margin: 0; line-height: 1.8; color: var(--muted); }
.stage-evidence { padding-left: 28px; border-left: 1px solid var(--line); }
.stage-evidence span, .stage-evidence strong { display: block; }
.stage-evidence span { margin-bottom: 9px; font-size: 11px; letter-spacing: .1em; color: var(--orange); }
.stage-evidence strong { line-height: 1.6; }

.assessment-section { color: white; background: var(--navy-2); padding: 0; }
.assessment-grid { width: 100%; max-width: none; display: grid; grid-template-columns: 1fr 1fr; }
.assessment-copy { padding: 105px max(48px, calc((100vw - 1180px)/2)); }
.assessment-copy h2 { max-width: 590px; }
.assessment-copy > p:not(.eyebrow) { max-width: 560px; margin-top: 28px; font-size: 17px; line-height: 1.9; color: rgba(255,255,255,.72); }
.assessment-chips { display: flex; flex-wrap: wrap; gap: 9px; margin: 30px 0 35px; }
.assessment-chips span { padding: 10px 16px; border: 1px solid rgba(255,255,255,.25); border-radius: 999px; font-size: 13px; }
.assessment-visual { margin: 0; min-height: 650px; overflow: hidden; }
.assessment-visual img { width: 100%; height: 100%; object-fit: cover; }
.text-link { display: inline-flex; gap: 8px; align-items: center; font-weight: 700; }
.light-link { color: #f4b082; }

.audience-section { background: var(--cream); }
.audience-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.audience-grid article { min-height: 185px; padding: 32px; background: var(--paper); }
.audience-grid strong { display: block; margin-bottom: 18px; font-size: 20px; }
.audience-grid p { margin: 0; line-height: 1.75; color: var(--muted); }

.support-section { background: #fff; }
.support-grid { display: grid; grid-template-columns: .78fr 1.22fr; gap: 90px; align-items: center; }
.support-image { position: relative; overflow: hidden; border-radius: 240px 240px 18px 18px; background: var(--cream); }
.support-image img { width: 100%; aspect-ratio: .72; object-fit: cover; object-position: center 25%; }
.support-content h2 { font-size: clamp(40px, 4.8vw, 62px); }
.support-lead { margin: 26px 0 36px; font-size: 18px; line-height: 1.85; color: var(--muted); }
.support-items { border-top: 1px solid var(--line); }
.support-items article { display: grid; grid-template-columns: 60px 1fr; padding: 21px 0; border-bottom: 1px solid var(--line); }
.support-items article > span { color: var(--orange); font: 12px ui-monospace, monospace; }
.support-items h3 { margin: 0 0 5px; font-size: 18px; }
.support-items p { margin: 0; line-height: 1.7; color: var(--muted); }

.about-section { color: white; background: var(--green); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 110px; }
.about-copy p { font-size: 17px; line-height: 2; color: rgba(255,255,255,.8); }
.about-copy .signature { margin-top: 34px; padding-top: 28px; border-top: 1px solid rgba(255,255,255,.28); font-family: "Songti SC", serif; font-size: 24px; color: white; }

.faq-section { background: #fff; }
.faq-grid { display: grid; grid-template-columns: .72fr 1.28fr; gap: 90px; }
.faq-grid h2 { font-size: clamp(36px,4vw,54px); }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; padding: 25px 46px 25px 0; cursor: pointer; list-style: none; font-size: 18px; font-weight: 700; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 5px; top: 20px; font-size: 28px; font-weight: 300; color: var(--orange); transition: transform .2s ease; }
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list details p { max-width: 680px; padding: 0 40px 24px 0; line-height: 1.85; color: var(--muted); }

.contact-section { padding: 86px 0; background: var(--cream); }
.contact-card { padding: 66px 70px; display: grid; grid-template-columns: 1.3fr .7fr; gap: 80px; align-items: end; color: white; background: var(--navy); }
.contact-card h2 { font-size: clamp(38px, 4.6vw, 62px); }
.contact-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 24px; }
.contact-actions p { margin: 0; line-height: 1.8; color: rgba(255,255,255,.65); }
.contact-actions strong { color: white; }

.site-footer { padding: 55px 0; color: rgba(255,255,255,.75); background: #0b2236; }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 35px; align-items: center; }
.footer-brand { color: white; }
.footer-brand small { color: rgba(255,255,255,.5); }
.footer-brand .brand-mark { background: var(--cream); color: var(--navy); }
.footer-links { display: flex; gap: 24px; font-size: 13px; }
.copyright { grid-column: 1 / -1; margin: 6px 0 0; padding-top: 25px; border-top: 1px solid rgba(255,255,255,.12); font-size: 12px; color: rgba(255,255,255,.38); }

@media (max-width: 980px) {
  .section { padding: 88px 0; }
  .main-nav, .nav-cta { display: none; }
  .menu-toggle { display: block; }
  .site-header.open .main-nav { display: flex; position: absolute; top: 78px; left: 0; right: 0; padding: 22px 24px 30px; flex-direction: column; gap: 0; background: var(--paper); border-bottom: 1px solid var(--line); }
  .site-header.open .main-nav a { padding: 14px 0; }
  .hero { min-height: 760px; }
  .hero-shade { background: linear-gradient(90deg, rgba(7,28,45,.95), rgba(7,28,45,.6)); }
  .split-heading, .about-grid, .faq-grid { grid-template-columns: 1fr; gap: 30px; }
  .track-card { padding: 36px; }
  .stage-tabs { grid-template-columns: repeat(4, 1fr); }
  .stage-detail { grid-template-columns: 1fr 1.5fr; }
  .stage-evidence { grid-column: 1 / -1; padding: 18px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .assessment-grid { grid-template-columns: 1fr; }
  .assessment-copy { padding: 88px 48px; }
  .assessment-visual { min-height: 480px; }
  .support-grid { grid-template-columns: .7fr 1.3fr; gap: 50px; }
  .contact-card { grid-template-columns: 1fr; gap: 38px; }
}

@media (max-width: 680px) {
  .shell { width: min(100% - 28px, 1180px); }
  .site-header { height: 68px; }
  .nav-shell { width: calc(100% - 24px); }
  .brand-mark { width: 34px; height: 34px; }
  .brand strong { font-size: 14px; }
  .site-header.open .main-nav { top: 68px; }
  .section { padding: 72px 0; }
  h2 { font-size: 38px; }
  .hero { min-height: 730px; padding-top: 68px; align-items: end; }
  .hero-media img { object-position: 64% center; }
  .hero-shade { background: linear-gradient(0deg, rgba(7,28,45,.98) 0%, rgba(7,28,45,.72) 64%, rgba(7,28,45,.3) 100%); }
  .hero-content { padding-bottom: 48px; }
  .hero h1 { font-size: 48px; }
  .hero-lead { font-size: 16px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-proof { margin-top: 42px; }
  .hero-proof div { padding-right: 10px; }
  .hero-proof strong { font-size: 24px; }
  .belief-strip { padding: 58px 0; }
  .belief-grid { grid-template-columns: 1fr; gap: 12px; }
  .belief-grid blockquote { font-size: 30px; }
  .section-heading { margin-bottom: 42px; }
  .problem-grid, .track-grid, .audience-grid, .support-grid, .footer-grid { grid-template-columns: 1fr; }
  .problem-grid article, .problem-grid article + article { padding: 26px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .problem-grid h3 { margin-top: 18px; }
  .principles-list article { grid-template-columns: 54px 1fr; }
  .track-card { min-height: 460px; padding: 30px 24px; }
  .track-card + .track-card { border-left: 0; border-top: 1px solid rgba(255,255,255,.22); }
  .stage-tabs { grid-template-columns: repeat(2, 1fr); }
  .stage-tab { min-height: 90px; }
  .stage-tab span { margin-bottom: 16px; }
  .stage-detail { grid-template-columns: 1fr; padding: 28px 24px; gap: 18px; }
  .stage-evidence { grid-column: auto; }
  .assessment-copy { padding: 72px 24px; }
  .assessment-visual { min-height: 340px; }
  .audience-grid { gap: 1px; }
  .audience-grid article { min-height: auto; }
  .support-image { width: min(400px, 100%); margin: auto; }
  .about-grid { gap: 45px; }
  .contact-card { width: calc(100% - 28px); padding: 45px 26px; }
  .footer-links { display: grid; grid-template-columns: 1fr 1fr; }
  .copyright { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition-duration: .01ms !important; } }