@charset "UTF-8";

:root {
  --lime: #a9e934;
  --lime-deep: #7ebf13;
  --ink: #121212;
  --paper: #f5f3eb;
  --white: #fff;
  --muted: #6f6c62;
  --line: #d8d6cd;
  --rail: clamp(205px, 15.5vw, 270px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: "Microsoft YaHei", "PingFang SC", sans-serif; line-height: 1.65; overflow-x: hidden; }
a, button, summary { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { display: block; max-width: 100%; }

.container { width: min(1200px, calc(100% - 48px)); margin: 0 auto; }
.site-header { position: fixed; z-index: 30; top: 0; left: 0; right: 0; height: 62px; padding: 0 clamp(18px, 2vw, 32px); display: flex; align-items: center; justify-content: space-between; background: var(--lime); border-bottom: 1px solid rgba(0, 0, 0, .24); }
.brand, .footer-brand { display: inline-flex; align-items: center; gap: 10px; min-width: 0; }
.brand img { width: 40px; height: 40px; object-fit: contain; }
.brand-copy { display: grid; line-height: 1.05; color: var(--ink); }
.brand-copy b { font-size: 18px; letter-spacing: -.04em; }
.brand-copy small { margin-top: 3px; font-size: 9px; font-weight: 700; letter-spacing: .12em; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.header-download, .hero-download, .download-section a { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 42px; padding: 10px 17px; background: var(--ink); color: var(--white); font-weight: 800; font-size: 14px; transition: transform .2s ease, background .2s ease; }
.header-download:hover, .hero-download:hover, .download-section a:hover { transform: translateY(-2px); background: #343434; }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 9px; border: 1px solid var(--ink); border-radius: 4px; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; height: 2px; margin: 4px 0; background: var(--ink); }

.channel-rail { position: fixed; z-index: 20; top: 62px; left: 0; bottom: 0; width: var(--rail); display: flex; flex-direction: column; padding: 16px 10px 25px; background: var(--white); border-right: 1px solid var(--ink); }
.channel-rail ul { list-style: none; padding: 0; margin: 0; }
.channel-rail li + li { margin-top: 10px; }
.channel-rail a { min-height: 54px; padding: 12px 14px; display: flex; justify-content: space-between; align-items: center; border: 1px solid var(--ink); font-weight: 800; transition: color .2s, background .2s; }
.channel-rail a:hover, .channel-rail a.is-current { background: var(--lime); }
.channel-rail a span { order: 2; font-size: 11px; letter-spacing: .08em; }
.channel-rail > p { margin: auto 14px 0; padding-top: 22px; border-top: 1px solid var(--line); font-style: italic; font-size: 13px; color: var(--muted); }

main { padding-top: 62px; margin-left: var(--rail); }
.hero { min-height: min(790px, calc(100vh - 62px)); display: flex; align-items: center; padding: clamp(45px, 9vw, 145px) clamp(34px, 9vw, 170px); background: linear-gradient(90deg, rgba(0,0,0,.52), rgba(0,0,0,.08)), url("../images/bjt.jpg") center/cover no-repeat; position: relative; isolation: isolate; }
.hero::after { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(115deg, rgba(0,0,0,.5) 0%, transparent 60%); }
.hero-panel { width: min(550px, 100%); padding: clamp(25px, 3vw, 44px); background: rgba(13, 13, 13, .88); color: var(--white); border-left: 7px solid var(--lime); box-shadow: 15px 16px 0 rgba(0,0,0,.24); }
.eyebrow, .section-kicker { margin: 0; color: var(--lime); font-size: 12px; font-weight: 900; letter-spacing: .14em; }
.hero h1 { margin: 6px 0 20px; font-size: clamp(50px, 5vw, 82px); line-height: .98; letter-spacing: -.08em; }
.hero-slogan { display: inline-block; margin: 0 0 20px; padding: 4px 8px; background: var(--lime); color: var(--ink); font-size: clamp(25px, 2.6vw, 40px); font-weight: 900; line-height: 1.25; }
.hero-desc { margin: 0; max-width: 31em; font-size: 15px; }
.topic-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 21px 0; }
.topic-tags span { padding: 3px 10px; border: 1px solid rgba(255,255,255,.85); font-size: 12px; font-weight: 700; }
.hero-download { width: fit-content; background: var(--white); color: var(--ink); }
.age-label { display: block; margin-top: 15px; color: rgba(255,255,255,.72); font-size: 12px; }

.content-section { width: min(1200px, calc(100% - 48px)); margin: 0 auto; padding: clamp(60px, 8vw, 110px) 0; }
.section-heading { margin-bottom: 28px; }
.section-heading h2 { margin: 2px 0 6px; font-size: clamp(32px, 4vw, 52px); line-height: 1.08; letter-spacing: -.06em; }
.section-heading p { margin: 0; color: var(--muted); }
.section-heading--split { display: flex; align-items: end; justify-content: space-between; gap: 24px; }
.section-heading--split > p { max-width: 360px; font-size: 14px; }
.schedule-section { padding-bottom: 35px; }
.table-wrap { overflow-x: auto; border: 1px solid var(--ink); background: var(--white); }
table { min-width: 650px; width: 100%; border-collapse: collapse; font-size: 14px; }
th { padding: 13px 16px; background: var(--ink); color: var(--white); text-align: left; }
td { padding: 13px 16px; border-top: 1px solid var(--ink); }
td + td, th + th { border-left: 1px solid var(--ink); }
td:first-child { width: 19%; font-weight: 800; }

.cover-strip { padding-top: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 7px; }
.cover-strip article { position: relative; min-height: 165px; overflow: hidden; background: var(--ink); color: var(--white); }
.cover-strip img { width: 100%; height: 100%; position: absolute; inset: 0; object-fit: cover; filter: grayscale(1) contrast(1.12); transition: transform .35s ease, filter .35s ease; }
.cover-strip article::after { content: ""; position: absolute; inset: 44% 0 0; background: linear-gradient(transparent, rgba(0,0,0,.92)); }
.cover-strip article:hover img { transform: scale(1.06); filter: grayscale(.65) contrast(1.05); }
.cover-strip strong, .cover-strip span { position: absolute; left: 13px; z-index: 1; }
.cover-strip strong { bottom: 27px; font-size: 22px; }
.cover-strip span { bottom: 9px; font-size: 12px; color: var(--lime); }

.shelf-section { border-top: 1px solid var(--line); }
.shelf-layout { display: grid; grid-template-columns: 1.45fr .75fr .75fr; grid-template-rows: repeat(2, minmax(150px, 1fr)); gap: 9px; }
.shelf-feature { grid-row: span 2; min-height: 450px; }
.shelf-card--tall { grid-row: span 2; }
.shelf-feature, .shelf-card { overflow: hidden; position: relative; background: var(--ink); color: var(--white); }
.shelf-feature img, .shelf-card img { width: 100%; height: 100%; position: absolute; inset: 0; object-fit: cover; filter: grayscale(.32) contrast(1.07); transition: transform .4s ease; }
.shelf-feature:hover img, .shelf-card:hover img { transform: scale(1.04); }
.shelf-feature::after, .shelf-card::after { content: ""; position: absolute; inset: 35% 0 0; background: linear-gradient(transparent, rgba(0,0,0,.9)); }
.shelf-feature div, .shelf-card div { position: absolute; z-index: 1; left: 18px; right: 18px; bottom: 16px; }
.shelf-feature span, .shelf-card span { color: var(--lime); font-size: 12px; font-weight: 800; }
.shelf-feature h3 { margin: 4px 0; max-width: 10em; font-size: clamp(25px, 2.8vw, 41px); line-height: 1.08; }
.shelf-feature p { margin: 0; font-size: 13px; }
.shelf-card h3 { margin: 3px 0 0; font-size: 16px; line-height: 1.25; }

.path-section { border-top: 1px solid var(--line); }
.path-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; padding: 0; margin: 0; list-style: none; }
.path-list li { position: relative; min-height: 140px; padding: 20px; background: var(--white); border: 1px solid var(--line); }
.path-list li:not(:last-child)::after { content: "›"; position: absolute; z-index: 2; top: 50%; right: -16px; width: 30px; height: 30px; transform: translateY(-50%); display: grid; place-items: center; background: var(--paper); font-size: 27px; }
.path-list b { color: var(--lime-deep); font-size: 22px; }
.path-list h3 { margin: 13px 0 5px; font-size: 17px; }
.path-list p { margin: 0; color: var(--muted); font-size: 13px; }

.faq-section { border-top: 1px solid var(--line); }
.faq-list { border-top: 1px solid var(--ink); }
.faq-list details { background: var(--white); border: 1px solid var(--ink); border-top: 0; }
.faq-list summary { min-height: 62px; padding: 17px 20px; display: flex; justify-content: space-between; align-items: center; cursor: pointer; font-weight: 800; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { font-size: 23px; font-weight: 400; transition: transform .2s ease; }
.faq-list details[open] summary span { transform: rotate(45deg); }
.faq-list details p { max-width: 860px; margin: 0; padding: 0 20px 19px; color: var(--muted); }
.faq-list details a { color: var(--lime-deep); text-decoration: underline; }

.voices-section { border-top: 1px solid var(--line); }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.review-card { min-height: 294px; padding: 21px; display: flex; flex-direction: column; background: var(--white); border: 1px solid var(--line); }
.review-card header { display: flex; align-items: center; gap: 10px; }
.avatar { width: 38px; height: 38px; display: grid; place-items: center; flex: none; border-radius: 50%; background: var(--lime); color: var(--ink); font-weight: 900; }
.review-card h3 { margin: 0; font-size: 14px; }
.review-card header p { margin: 0; color: #9acb27; font-size: 12px; letter-spacing: .06em; }
.review-card > p { margin: 15px 0 12px; color: #48463f; font-size: 13px; line-height: 1.75; }
.review-card time { margin-top: auto; color: var(--muted); font-size: 12px; text-align: right; }

.download-section { padding: clamp(70px, 9vw, 125px) 24px; text-align: center; background: var(--ink); color: var(--white); }
.download-section h2 { margin: 5px 0 10px; font-size: clamp(34px, 5vw, 66px); line-height: 1.08; }
.download-section p { margin: 0 0 25px; color: rgba(255,255,255,.72); }
.download-section a { background: var(--lime); color: var(--ink); }
.download-section a:hover { background: var(--white); }

.site-footer { margin-left: var(--rail); padding: 36px clamp(24px, 5vw, 85px) 24px; display: grid; justify-items: center; background: #0b0b0b; color: var(--white); }
.footer-brand { width: fit-content; justify-self: center; justify-content: center; margin: 0; }
.footer-brand img { width: 42px; height: 42px; object-fit: contain; }
.footer-brand div { display: grid; line-height: 1.18; text-align: left; }
.footer-brand b { font-size: 18px; }
.footer-brand span { margin-top: 4px; color: rgba(255,255,255,.58); font-size: 12px; }
.site-footer nav { margin: 25px auto; display: flex; justify-content: center; flex-wrap: wrap; gap: 0; }
.site-footer nav a { padding: 0 15px; border-right: 1px solid rgba(255,255,255,.35); font-size: 13px; }
.site-footer nav a:last-child { border: 0; }
.site-footer > p { margin: 0; color: rgba(255,255,255,.5); text-align: center; font-size: 12px; }
.back-top { position: fixed; z-index: 15; right: 20px; bottom: 20px; width: 42px; height: 42px; border: 1px solid var(--ink); border-radius: 50%; background: var(--lime); color: var(--ink); cursor: pointer; opacity: 0; transform: translateY(10px); pointer-events: none; transition: .2s; }
.back-top.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
:focus-visible { outline: 3px solid #ecffb4; outline-offset: 3px; }

@media (max-width: 900px) {
  :root { --rail: 0px; }
  .site-header { height: 65px; }
  .brand img { width: 38px; height: 38px; }
  .brand-copy b { font-size: 16px; }
  .header-download { min-height: 38px; padding: 8px 11px; font-size: 12px; white-space: nowrap; }
  .menu-toggle { display: block; }
  .channel-rail { top: 65px; width: min(290px, 82vw); height: auto; padding: 12px; transform: translateX(-105%); box-shadow: 12px 10px 24px rgba(0,0,0,.16); transition: transform .22s ease; }
  .channel-rail.is-open { transform: translateX(0); }
  .channel-rail > p { margin: 26px 12px 8px; }
  main { padding-top: 65px; margin-left: 0; }
  .hero { min-height: 680px; padding: 72px 22px; background-position: 57% center; }
  .hero-panel { padding: 25px 20px; }
  .hero h1 { font-size: clamp(48px, 16vw, 67px); margin-bottom: 17px; }
  .hero-slogan { font-size: clamp(24px, 8vw, 34px); }
  .content-section { width: min(100% - 30px, 680px); padding: 58px 0; }
  .section-heading--split { display: block; }
  .section-heading--split > p { margin-top: 10px; }
  .cover-strip { display: flex; width: 100%; padding: 0 15px 55px; overflow-x: auto; gap: 9px; scroll-snap-type: x mandatory; }
  .cover-strip article { min-width: 152px; min-height: 192px; scroll-snap-align: start; }
  .shelf-layout { grid-template-columns: 1fr 1fr; grid-template-rows: 260px 190px; }
  .shelf-feature { grid-column: span 2; grid-row: auto; min-height: 260px; }
  .shelf-card--tall { grid-row: auto; }
  .path-list { grid-template-columns: 1fr 1fr; }
  .path-list li:not(:last-child)::after { display: none; }
  .review-grid { grid-template-columns: 1fr; }
  .review-card { min-height: 0; }
  .site-footer { margin-left: 0; padding: 34px 20px 24px; text-align: center; }
  .footer-brand { justify-content: center; }
  .site-footer nav { row-gap: 13px; }
  .site-footer nav a { padding: 0 9px; }
}

@media (max-width: 480px) {
  .site-header { padding: 0 13px; }
  .brand { gap: 7px; }
  .brand-copy small { font-size: 8px; }
  .header-actions { gap: 7px; }
  .header-download { padding: 8px 9px; }
  .hero { min-height: 650px; padding: 48px 15px; }
  .hero-panel { border-left-width: 5px; }
  .hero-desc { font-size: 14px; }
  .topic-tags span { font-size: 11px; }
  .table-wrap { margin: 0 -15px; }
  .section-heading h2 { font-size: 35px; }
  .shelf-layout { gap: 6px; grid-template-rows: 245px 155px; }
  .shelf-feature { min-height: 245px; }
  .shelf-feature h3 { font-size: 28px; }
  .shelf-card div { left: 11px; right: 11px; bottom: 10px; }
  .shelf-card h3 { font-size: 14px; }
  .path-list li { min-height: 125px; padding: 16px; }
  .faq-list summary { padding: 15px; font-size: 14px; }
  .faq-list details p { padding: 0 15px 16px; font-size: 14px; }
  .back-top { right: 13px; bottom: 13px; }
}