@charset "UTF-8";

:root {
  --brand: #4b5bc0;
  --brand-deep: #1f2a62;
  --ink: #182043;
  --paper: #f4f4f6;
  --white: #ffffff;
  --accent: #ff715c;
  --line: #d9dce6;
  --muted: #66708a;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { min-width: 320px; margin: 0; padding-top: 62px; overflow-x: hidden; color: var(--ink); background: var(--paper); font: 15px/1.7 "Microsoft YaHei", Arial, sans-serif; }
a, button, summary { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { max-width: 100%; }

.brand-bar { position: fixed; z-index: 30; top: 0; right: 0; left: 0; display: flex; align-items: center; justify-content: space-between; height: 62px; padding: 0 22px; color: var(--white); background: var(--brand); }
.brand, .footer-brand { display: inline-flex; align-items: center; min-width: 0; gap: 9px; }
.brand img, .footer-brand img { width: 34px; height: 34px; border-radius: 50%; object-fit: contain; background: var(--white); }
.brand span, .footer-brand span { display: grid; line-height: 1.1; }
.brand strong, .footer-brand strong { font-size: 16px; }
.brand small, .footer-brand small { color: rgba(255,255,255,.77); font-size: 11px; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.top-download, .primary-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 38px; padding: 0 16px; border-radius: 5px; color: var(--white); background: var(--accent); font-size: 13px; font-weight: 900; white-space: nowrap; }

.hero { display: grid; grid-template-columns: minmax(190px, 14vw) minmax(0, 1fr); min-height: 650px; }
.channel-nav { position: relative; z-index: 2; display: flex; flex-direction: column; padding: 16px 10px 24px; border-right: 1px solid #cdd1dd; background: var(--paper); }
.channel-nav ul { display: grid; padding: 0; margin: 0; list-style: none; gap: 9px; }
.channel-nav a { display: flex; align-items: center; justify-content: space-between; min-height: 48px; padding: 8px 12px; border: 2px solid var(--ink); border-radius: 5px; color: var(--ink); background: var(--white); font-weight: 900; }
.channel-nav a b { color: var(--brand); font-size: 11px; }
.channel-nav a.is-active, .channel-nav a:hover { border-color: var(--accent); color: var(--white); background: var(--accent); }
.channel-nav a.is-active b, .channel-nav a:hover b { color: var(--white); }
.channel-nav > p { margin: auto 14px 0; color: var(--muted); font-size: 12px; font-style: italic; }
.nav-toggle { display: none; }

.hero-scene { position: relative; display: flex; align-items: center; min-height: 650px; padding: 72px clamp(34px, 8vw, 150px); overflow: hidden; background: linear-gradient(90deg, rgba(13,17,36,.72), rgba(13,17,36,.22)), url("../images/bjt.jpg") center / cover; }
.hero-scene::after { position: absolute; inset: 0; content: ""; background: linear-gradient(0deg, rgba(13,17,36,.54), transparent 48%); pointer-events: none; }
.hero-overlay { position: relative; z-index: 1; max-width: 560px; padding: 28px 34px; border-left: 7px solid var(--accent); color: var(--white); background: rgba(10,13,24,.76); }
.hero-kicker, .section-note { margin: 0; color: var(--accent); font-size: 12px; font-weight: 900; letter-spacing: .12em; }
.hero-overlay h1 { margin: 4px 0 0; font-size: clamp(48px, 6vw, 76px); line-height: 1.05; letter-spacing: -.06em; }
.hero-slogan { display: inline-block; margin: 16px 0 0; padding: 2px 8px; color: var(--white); background: var(--accent); font-size: clamp(25px, 3vw, 36px); font-weight: 900; line-height: 1.32; }
.hero-desc { margin: 20px 0 16px; color: rgba(255,255,255,.88); }
.hero-tags { display: flex; flex-wrap: wrap; padding: 0; margin: 0; list-style: none; gap: 7px; }
.hero-tags li { padding: 3px 9px; border: 1px solid rgba(255,255,255,.54); border-radius: 5px; font-size: 12px; }
.hero-overlay .primary-btn { margin-top: 20px; color: var(--ink); background: var(--white); }
.primary-btn b { margin-left: 12px; font-size: 17px; }
.age-label { display: block; margin-top: 13px; color: rgba(255,255,255,.66); font-size: 12px; }

.content { width: min(1200px, calc(100% - 48px)); margin: 0 auto; padding: 62px 0; }
.section-title { display: flex; align-items: baseline; gap: 10px; }
.section-title > span { width: 4px; height: 22px; border-radius: 5px; background: var(--accent); }
.section-title h2, .arrange-copy h2, .philosophy h2, .community-section h2, .download-section h2 { margin: 0; font-size: clamp(26px, 3vw, 36px); line-height: 1.2; }
.section-title a, .section-title p { margin: 0 0 0 auto; color: var(--muted); font-size: 12px; }
.table-scroll { margin-top: 20px; overflow-x: auto; }
table { width: 100%; min-width: 620px; border-collapse: collapse; background: var(--white); }
th, td { padding: 11px 14px; border: 1px solid var(--ink); text-align: left; }
th { color: var(--white); background: var(--ink); font-size: 13px; }
td { font-size: 13px; }
.cover-strip { display: grid; grid-template-columns: repeat(5, 1fr); margin-top: 22px; gap: 10px; }
.cover-strip article { display: grid; min-width: 0; gap: 6px; }
.cover-strip img { width: 100%; height: 112px; border: 2px solid var(--ink); border-radius: 5px; object-fit: contain; background: var(--white); }
.cover-strip b { font-size: 13px; }
.cover-strip span { color: var(--muted); font-size: 11px; }
.channel-section { padding-top: 14px; }
.lead { max-width: 760px; margin: 14px 0 20px; color: var(--muted); }
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.value-grid article, .suggestions article { padding: 18px; border: 1px solid var(--line); border-radius: 5px; background: var(--white); }
.value-grid b, .suggestions b { font-size: 16px; }
.value-grid p, .suggestions p { margin: 6px 0 0; color: var(--muted); font-size: 13px; }
.arrange-section { display: grid; grid-template-columns: 1fr .8fr; align-items: center; gap: 52px; }
.arrange-copy > p:not(.section-note) { max-width: 510px; color: var(--muted); }
.arrange-copy ul { display: grid; padding: 0; margin: 24px 0 0; list-style: none; gap: 8px; }
.arrange-copy li { display: grid; grid-template-columns: 120px 1fr; padding: 12px 14px; border: 1px solid var(--line); border-radius: 5px; background: var(--white); gap: 12px; }
.arrange-copy li span { color: var(--muted); font-size: 13px; }
.arrange-section figure { position: relative; min-height: 355px; margin: 0; overflow: hidden; border-radius: 5px; background: var(--white); }
.arrange-section figure::before { position: absolute; z-index: 1; inset: 0; content: ""; background: linear-gradient(90deg, rgba(14,18,40,.1), transparent); pointer-events: none; }
.arrange-section figure img { width: 100%; height: 355px; object-fit: contain; }
.arrange-section figcaption, .gallery-grid figcaption { position: absolute; right: 0; bottom: 0; left: 0; padding: 8px 10px; color: var(--white); background: rgba(12,16,34,.77); font-size: 12px; font-weight: 800; }
.steps-section ol { display: grid; grid-template-columns: repeat(4, 1fr); padding: 0; margin: 22px 0 0; list-style: none; gap: 10px; }
.steps-section li { display: grid; min-height: 126px; padding: 17px; border: 1px solid var(--line); border-radius: 5px; background: var(--white); }
.steps-section li b { color: var(--accent); font-size: 12px; }
.steps-section li strong { align-self: end; }
.steps-section li span { color: var(--muted); font-size: 12px; }
.faq-section { padding-top: 14px; }
.faq-list { display: grid; margin-top: 20px; gap: 8px; }
.faq-list details { border: 1px solid var(--line); border-radius: 5px; background: var(--white); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; min-height: 56px; padding: 10px 16px; cursor: pointer; font-weight: 900; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary b { color: var(--brand); font-size: 20px; font-weight: 400; }
.faq-list details[open] summary b { transform: rotate(45deg); }
.faq-list details p { padding: 0 16px 16px; margin: 0; color: var(--muted); font-size: 13px; }
.faq-list details p a { color: var(--brand); text-decoration: underline; }
.gallery-section { padding-top: 14px; }
.gallery-grid { display: grid; grid-template-columns: 1.35fr .8fr .8fr; grid-template-rows: repeat(2, 155px); margin-top: 22px; gap: 9px; }
.gallery-grid figure { position: relative; min-width: 0; margin: 0; overflow: hidden; border-radius: 5px; background: var(--white); }
.gallery-grid img { width: 100%; height: 100%; object-fit: cover; }
.gallery-grid .gallery-main { grid-row: span 2; }
.suggestions { padding-top: 16px; }
.suggestions > div:last-child { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 20px; gap: 12px; }
.philosophy { padding-top: 18px; padding-bottom: 68px; }
.philosophy p { max-width: 880px; color: #4d5570; }
.community-section { color: var(--white); background: var(--ink); }
.community-inner { display: grid; grid-template-columns: .7fr 1.3fr; width: min(1200px, calc(100% - 48px)); margin: 0 auto; padding: 42px 0; gap: 38px; }
.community-inner > div:first-child p { margin: 0; color: #a8b6ff; font-size: 12px; font-weight: 900; letter-spacing: .1em; }
.community-inner > div:first-child span { color: rgba(255,255,255,.68); font-size: 13px; }
.review-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.review-list article { display: flex; flex-direction: column; min-height: 148px; padding: 15px; border-radius: 5px; background: #28325f; }
.review-list header { display: grid; grid-template-columns: 28px minmax(0, 1fr) 64px; align-items: center; gap: 6px; }
.avatar-icon { width: 28px; height: 28px; border-radius: 50%; background: url("../icons/avatar.svg") center / contain no-repeat; }
.review-list strong { min-width: 0; overflow: hidden; font-size: 12px; white-space: nowrap; }
.rating { display: flex; width: 64px; overflow: hidden; color: #ffbd45; font-size: 0; }
.rating i { display: block; flex: 0 0 11px; height: 15px; overflow: hidden; color: transparent; font-size: 0; font-style: normal; }
.rating i::before { display: block; content: "★"; color: #ffbd45; font-size: 11px; line-height: 15px; }
.review-list p { margin: 11px 0; color: rgba(255,255,255,.75); font-size: 12px; }
.review-list time { margin-top: auto; color: #aeb8df; font-size: 11px; text-align: right; }
.download-section { display: grid; justify-items: center; padding: 70px 0; text-align: center; }
.download-section > p { margin: 0; color: var(--accent); font-size: 12px; font-weight: 900; letter-spacing: .12em; }
.download-section h2 { margin: 8px 0 20px; }
.download-section .primary-btn { min-height: 46px; }
.site-footer { display: grid; grid-template-columns: 1fr 1fr; align-items: center; padding: 26px max(24px, calc((100vw - 1200px) / 2)); border-top: 1px solid var(--line); background: #e8ebf4; gap: 18px 20px; }
.footer-brand { color: var(--ink); }
.footer-brand small { color: var(--muted); }
.site-footer ul { display: flex; justify-content: flex-end; flex-wrap: wrap; padding: 0; margin: 0; list-style: none; gap: 16px; color: var(--muted); font-size: 12px; }
.site-footer > small { grid-column: 1 / -1; color: var(--muted); font-size: 12px; text-align: center; }
.to-top { position: fixed; z-index: 20; right: 22px; bottom: 22px; display: grid; width: 42px; height: 42px; padding: 0; place-items: center; border: 1px solid #9faadd; border-radius: 50%; background: var(--white); cursor: pointer; opacity: 0; pointer-events: none; transition: opacity .2s; }
.to-top.is-visible { opacity: 1; pointer-events: auto; }
.to-top img { width: 16px; height: 16px; }

@media (max-width: 880px) {
  .hero { grid-template-columns: 170px minmax(0, 1fr); }
  .hero-scene { padding: 50px; }
  .cover-strip { grid-template-columns: repeat(3, 1fr); }
  .arrange-section { gap: 24px; }
  .review-list { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 680px) {
  body { padding-top: 60px; }
  .brand-bar { height: 60px; padding: 0 12px; }
  .brand img { width: 31px; height: 31px; }
  .brand strong { font-size: 15px; }
  .top-download { min-height: 34px; padding: 0 10px; font-size: 12px; }
  .hero { display: block; min-height: 0; }
  .channel-nav { position: static; padding: 0; border: 0; background: transparent; }
  .nav-toggle { display: flex; width: 37px; height: 34px; flex-direction: column; align-items: center; justify-content: center; padding: 0; border: 1px solid var(--brand); border-radius: 5px; color: var(--brand); background: var(--white); gap: 4px; }
  .nav-toggle i { display: block; width: 16px; height: 2px; background: currentColor; }
  .channel-nav ul { position: fixed; z-index: 29; top: 60px; right: 12px; display: none; width: min(250px, calc(100vw - 24px)); padding: 10px; border: 1px solid var(--line); border-radius: 5px; background: rgba(255,255,255,.98); box-shadow: 0 10px 24px rgba(22,30,65,.18); }
  .channel-nav.is-open ul { display: grid; }
  .channel-nav > p { display: none; }
  .hero-scene { min-height: 570px; padding: 86px 14px 50px; background-position: 58% center; }
  .hero-overlay { width: 100%; padding: 23px 18px; text-align: center; border-top: 5px solid var(--accent); border-left: 0; }
  .hero-overlay h1 { font-size: 48px; }
  .hero-slogan { font-size: 25px; }
  .hero-tags { justify-content: center; }
  .hero-desc { font-size: 14px; }
  .content { width: calc(100% - 28px); padding: 48px 0; }
  .cover-strip { display: flex; padding-bottom: 8px; overflow-x: auto; gap: 10px; touch-action: pan-x pan-y; }
  .cover-strip article { flex: 0 0 138px; }
  .cover-strip img { height: 110px; }
  .value-grid, .suggestions > div:last-child { grid-template-columns: 1fr; }
  .arrange-section { grid-template-columns: 1fr; gap: 24px; }
  .arrange-section figure, .arrange-section figure img { height: 280px; min-height: 0; }
  .steps-section ol { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: 1fr 1fr; grid-template-rows: 190px 115px 115px; }
  .gallery-grid .gallery-main { grid-row: span 2; }
  .gallery-grid figure:last-child { grid-column: span 2; }
  .community-inner { grid-template-columns: 1fr; width: calc(100% - 28px); padding: 36px 0; gap: 20px; }
  .review-list { grid-template-columns: 1fr; }
  .download-section { padding: 58px 0; }
  .site-footer { grid-template-columns: 1fr; justify-items: center; padding: 28px 16px; text-align: center; }
  .site-footer > small { text-align: center; }
  .to-top { right: 14px; bottom: 14px; }
}

@media (hover: none) and (pointer: coarse) {
  a:active, button:active, summary:active { opacity: 1; filter: none; transition: none; animation: none; }
}