:root {
  --navy-950: #031025;
  --navy-900: #061a38;
  --navy-800: #0a2851;
  --blue-700: #075bd8;
  --blue-600: #0877f9;
  --cyan-400: #25d8ff;
  --ink: #152033;
  --muted: #637083;
  --line: #dfe6ef;
  --soft: #f4f7fb;
  --white: #fff;
  --shadow: 0 18px 55px rgba(9, 35, 74, .12);
  --radius-lg: 24px;
  --radius-md: 16px;
  --container: 1200px;
  --header-height: 72px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 20px); }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
.container { width: min(calc(100% - 48px), var(--container)); margin-inline: auto; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 1000; padding: 10px 16px; color: #fff; background: #065ad6; border-radius: 8px; transform: translateY(-150%); }
.skip-link:focus { transform: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid rgba(17, 39, 72, .08);
  backdrop-filter: blur(15px);
}
.nav-shell { width: min(calc(100% - 48px), var(--container)); height: 100%; margin-inline: auto; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: #10233e; font-size: 20px; font-weight: 750; letter-spacing: .03em; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; color: var(--blue-600); }
.brand-mark svg { width: 100%; height: 100%; }
.brand-mark svg path:first-child { fill: currentColor; opacity: .12; stroke: currentColor; stroke-width: 1.8; }
.brand-mark svg path:last-child { fill: none; stroke: currentColor; stroke-linecap: round; stroke-width: 2.2; }
.primary-nav { height: 100%; display: flex; align-items: center; gap: 8px; }
.primary-nav a { position: relative; display: grid; place-items: center; height: 100%; min-width: 92px; padding-inline: 18px; color: #38465a; font-size: 15px; font-weight: 600; transition: color .2s ease; }
.primary-nav a::after { content: ""; position: absolute; left: 24px; right: 24px; bottom: 0; height: 3px; background: var(--blue-600); transform: scaleX(0); transition: transform .2s ease; }
.primary-nav a:hover, .primary-nav a.active { color: var(--blue-700); }
.primary-nav a.active::after { transform: scaleX(1); }
.menu-toggle { display: none; width: 44px; height: 44px; padding: 11px; background: transparent; border: 0; border-radius: 9px; cursor: pointer; }
.menu-toggle span { display: block; width: 22px; height: 2px; margin: 5px 0; background: #19314e; border-radius: 2px; transition: transform .2s ease, opacity .2s ease; }

.hero-carousel { position: relative; min-height: 540px; height: min(calc(100vh - var(--header-height)), 720px); color: #fff; background: var(--navy-950); overflow: hidden; }
.slides, .hero-slide { position: absolute; inset: 0; }
.hero-slide { visibility: hidden; opacity: 0; transition: opacity .8s ease, visibility .8s ease; }
.hero-slide.is-active { visibility: visible; opacity: 1; z-index: 1; }
.hero-slide > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(2, 13, 31, .78) 0%, rgba(2, 13, 31, .56) 34%, rgba(2, 13, 31, .08) 65%, rgba(2, 13, 31, .06) 100%); }
.hero-content { position: relative; z-index: 2; display: flex; height: 100%; align-items: flex-start; justify-content: center; flex-direction: column; padding-bottom: 28px; }
.eyebrow, .section-kicker { margin: 0 0 12px; color: var(--cyan-400); font-size: 14px; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
.hero-content h1, .hero-content h2 { max-width: 620px; margin: 0; color: #fff; font-size: clamp(48px, 5vw, 76px); line-height: 1.12; letter-spacing: -.035em; }
.hero-content > p:not(.eyebrow) { max-width: 560px; margin: 24px 0 32px; color: rgba(255, 255, 255, .84); font-size: clamp(16px, 1.5vw, 19px); }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: 0 26px; border: 1px solid transparent; border-radius: 999px; font-size: 15px; font-weight: 750; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #fff; background: linear-gradient(135deg, #0877f9, #00b9ef); box-shadow: 0 12px 28px rgba(0, 137, 255, .25); }
.button-primary:hover { box-shadow: 0 14px 34px rgba(0, 137, 255, .38); }
.button-light { color: var(--blue-700); background: #fff; box-shadow: 0 12px 30px rgba(1, 18, 49, .18); }
.carousel-arrow { position: absolute; z-index: 5; top: 50%; display: grid; width: 48px; height: 48px; place-items: center; color: #fff; background: rgba(6, 23, 52, .38); border: 1px solid rgba(255, 255, 255, .28); border-radius: 50%; cursor: pointer; transform: translateY(-50%); backdrop-filter: blur(8px); opacity: .72; transition: opacity .2s ease, background .2s ease; }
.carousel-arrow:hover { opacity: 1; background: rgba(8, 119, 249, .72); }
.carousel-arrow svg { width: 22px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 2; }
.carousel-prev { left: 28px; }
.carousel-next { right: 28px; }
.carousel-dots { position: absolute; z-index: 5; left: 50%; bottom: 24px; display: flex; gap: 10px; transform: translateX(-50%); }
.carousel-dots button { width: 34px; height: 4px; padding: 0; background: rgba(255, 255, 255, .4); border: 0; border-radius: 99px; cursor: pointer; transition: width .25s ease, background .25s ease; }
.carousel-dots button.is-active { width: 58px; background: var(--cyan-400); }

.stats-strip { position: relative; z-index: 6; color: #fff; background: linear-gradient(115deg, #071c3d, #0a2c59); border-top: 1px solid rgba(255, 255, 255, .08); }
.stats-grid { min-height: 132px; display: grid; grid-template-columns: repeat(4, 1fr); align-items: center; }
.stats-grid > div { display: flex; min-height: 70px; align-items: center; justify-content: center; flex-direction: column; text-align: center; border-right: 1px solid rgba(255, 255, 255, .13); }
.stats-grid > div:last-child { border-right: 0; }
.stats-grid strong { color: #fff; font-size: clamp(26px, 3vw, 38px); line-height: 1.2; letter-spacing: -.02em; }
.stats-grid span { margin-top: 6px; color: rgba(255, 255, 255, .63); font-size: 13px; }

.section { padding: 112px 0; }
.section-soft { background: var(--soft); }
.split-layout { display: grid; grid-template-columns: minmax(0, .9fr) minmax(420px, 1.1fr); gap: 76px; align-items: center; }
.section-kicker { color: var(--blue-600); }
.section-copy h2, .section-heading h2, .trust-copy h2 { margin: 0; color: #0d1c32; font-size: clamp(34px, 4vw, 52px); line-height: 1.22; letter-spacing: -.035em; }
.section-lead { margin: 24px 0 0; color: var(--muted); font-size: 17px; }
.check-list { margin: 34px 0 0; padding: 0; list-style: none; }
.check-list li { display: flex; gap: 18px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.check-list li > span { display: grid; width: 42px; height: 42px; flex: 0 0 auto; place-items: center; color: var(--blue-700); background: #e8f2ff; border-radius: 12px; font-size: 12px; font-weight: 800; }
.check-list strong { color: #172840; font-size: 17px; }
.check-list p { margin: 3px 0 0; color: var(--muted); font-size: 14px; }
.product-visual { position: relative; margin: 0; padding: 10px; background: #fff; border: 1px solid #e7ecf2; border-radius: 28px; box-shadow: 0 20px 55px rgba(30, 48, 73, .1); overflow: hidden; }
.product-visual img { position: relative; width: 100%; height: auto; aspect-ratio: 3 / 2; object-fit: cover; border-radius: 19px; }

.section-heading { max-width: 760px; margin: 0 auto 54px; text-align: center; }
.section-heading > p:last-child { margin: 20px auto 0; color: var(--muted); font-size: 17px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card { min-height: 248px; background: #fff; border: 1px solid rgba(18, 46, 82, .08); border-radius: var(--radius-lg); box-shadow: 0 10px 30px rgba(8, 34, 73, .05); overflow: hidden; transition: transform .25s ease, box-shadow .25s ease; }
.feature-card:hover { transform: translateY(-5px); box-shadow: 0 18px 40px rgba(8, 34, 73, .12); }
.feature-icon { display: grid; width: 62px; height: 62px; margin: 28px 26px 0; place-items: center; color: #2679ca; background: linear-gradient(145deg, #eef7ff, #e3f1fb); border-radius: 18px; }
.feature-icon svg { width: 31px; height: 31px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 1.7; }
.feature-card > div:not(.feature-icon) { position: relative; padding: 20px 26px 28px; }
.feature-card > div:not(.feature-icon) > span { position: absolute; top: 22px; right: 26px; color: #b7c5d8; font-size: 12px; font-weight: 800; }
.feature-card h3 { margin: 0; color: #142640; font-size: 21px; }
.feature-card p { margin: 8px 28px 0 0; color: var(--muted); font-size: 14px; }

.capability-section { color: var(--ink); background: linear-gradient(180deg, #f7f9fb 0%, #eef3f7 100%); }
.section-heading-light h2 { color: #0d1c32; }
.section-heading-light > p:last-child { color: var(--muted); }
.showcase-row { display: grid; grid-template-columns: 1fr 1fr; gap: 76px; align-items: center; padding: 62px 0; border-top: 1px solid #dfe6ed; }
.showcase-row:last-child { padding-bottom: 0; }
.showcase-reverse .showcase-image { order: 2; }
.showcase-image { position: relative; padding: 9px; background: #fff; border: 1px solid #e1e8ef; border-radius: 26px; box-shadow: 0 22px 58px rgba(31, 51, 77, .1); }
.showcase-image img { width: 100%; height: auto; aspect-ratio: 3 / 2; object-fit: cover; border-radius: 18px; }
.showcase-copy > span { color: #2979c7; font-size: 13px; font-weight: 800; letter-spacing: .15em; }
.showcase-copy h3 { margin: 12px 0 18px; color: #14253d; font-size: clamp(28px, 3.4vw, 43px); line-height: 1.28; }
.showcase-copy p { margin: 0; color: var(--muted); font-size: 16px; }
.showcase-copy ul { display: flex; flex-wrap: wrap; gap: 10px; margin: 28px 0 0; padding: 0; list-style: none; }
.showcase-copy li { padding: 8px 13px; color: #285d90; background: #e7f1fa; border: 1px solid #d5e7f5; border-radius: 999px; font-size: 13px; }

.trust-grid { display: grid; grid-template-columns: .86fr 1.14fr; gap: 70px; align-items: start; }
.trust-copy { padding-top: 48px; }
.trust-points { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 34px 0 0; }
.trust-points > div { display: flex; flex-direction: column; min-height: 108px; justify-content: center; padding: 20px; background: #f4f8fd; border: 1px solid #e2eaf4; border-radius: 15px; }
.trust-points strong { color: #112846; font-size: 16px; }
.trust-points span { margin-top: 4px; color: var(--muted); font-size: 13px; }
.copyright-note { margin: 24px 0 0; padding-left: 16px; color: #164f92; border-left: 3px solid var(--blue-600); font-size: 14px; font-weight: 700; }
.trust-gallery { position: relative; display: grid; grid-template-columns: 1fr .72fr; align-items: center; gap: 18px; }
.tall-asset { margin: 0; padding: 10px; background: #081e41; border-radius: 24px; box-shadow: var(--shadow); }
.tall-asset img { width: 100%; border-radius: 15px; }
.author-asset { transform: translateY(28px); }
.advantage-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.advantage-grid article { min-height: 225px; padding: 30px 26px; background: #f6f8fa; border: 1px solid #e4e9ee; border-radius: 20px; }
.advantage-grid article > span { display: block; margin-bottom: 30px; color: #8ea1b3; font-size: 12px; font-weight: 800; }
.advantage-grid h3 { margin: 0; color: #182a40; font-size: 19px; }
.advantage-grid p { margin: 10px 0 0; color: var(--muted); font-size: 14px; }

.purchase-cta { padding: 78px 0; color: #fff; background: linear-gradient(115deg, #075bd8 0%, #0877f9 46%, #00aeda 100%); }
.purchase-cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.purchase-cta p { margin: 0 0 4px; color: rgba(255, 255, 255, .76); }
.purchase-cta h2 { margin: 0; color: #fff; font-size: clamp(30px, 3vw, 44px); }

.site-footer { padding: 66px 0 24px; color: rgba(255, 255, 255, .64); background: #031025; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 64px; }
.footer-brand { color: #fff; }
.footer-grid p { margin: 15px 0 0; }
.footer-grid > div:not(:first-child) { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }
.footer-grid strong { margin-bottom: 4px; color: #fff; }
.footer-grid a:not(.brand):hover { color: #fff; }
.footer-bottom { margin-top: 46px; padding-top: 22px; border-top: 1px solid rgba(255, 255, 255, .1); font-size: 13px; }

.purchase-page { background: #fff; }
.purchase-hero { padding: 84px 0 92px; overflow: hidden; background: radial-gradient(circle at 78% 18%, #dcefff 0, transparent 34%), linear-gradient(145deg, #f8fbfe, #eef5fa); }
.purchase-hero-grid { display: grid; grid-template-columns: .95fr 1.05fr; gap: 76px; align-items: center; }
.purchase-hero-copy h1 { margin: 0; color: #0d1c32; font-size: clamp(48px, 5vw, 72px); line-height: 1.08; letter-spacing: -.045em; }
.purchase-lead { max-width: 610px; margin: 24px 0 0; color: var(--muted); font-size: 18px; }
.purchase-spec-pills { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.purchase-spec-pills span { padding: 9px 14px; color: #1f609d; background: rgba(255,255,255,.82); border: 1px solid #d6e7f5; border-radius: 999px; font-size: 14px; font-weight: 750; }
.purchase-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.purchase-button-secondary { color: var(--blue-700); background: #fff; border-color: #bcd7ee; }
.purchase-product-visual { margin: 0; padding: 12px; background: #fff; border: 1px solid #dfe9f2; border-radius: 30px; box-shadow: 0 28px 70px rgba(25, 56, 92, .14); overflow: hidden; }
.purchase-product-visual img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; object-position: center 56%; border-radius: 21px; }
.purchase-buy-section { padding: 112px 0; background: #fff; }
.purchase-buy-grid { display: grid; grid-template-columns: 1fr 430px; gap: 92px; align-items: center; }
.purchase-buy-copy h1 { margin: 0; color: #0d1c32; font-size: clamp(38px, 4vw, 54px); line-height: 1.18; letter-spacing: -.035em; }
.purchase-buy-copy > p:not(.section-kicker) { max-width: 650px; margin: 22px 0 0; color: var(--muted); font-size: 17px; }
.purchase-channel-points { display: grid; gap: 12px; margin-top: 32px; }
.purchase-channel-points > div { display: flex; gap: 16px; padding: 18px; background: #f5f8fb; border: 1px solid #e1e9f0; border-radius: 16px; }
.purchase-channel-points > div > span { display: grid; width: 42px; height: 42px; flex: 0 0 auto; place-items: center; color: #0e68d8; background: #e2effd; border-radius: 12px; font-size: 12px; font-weight: 850; }
.purchase-channel-points strong { color: #142640; font-size: 16px; }
.purchase-channel-points p { margin: 3px 0 0; color: var(--muted); font-size: 14px; }
.purchase-qr-card { padding: 34px; text-align: center; background: linear-gradient(160deg, #f7fbff, #edf5fb); border: 1px solid #dbe8f2; border-radius: 28px; box-shadow: var(--shadow); }
.purchase-qr-frame { width: 260px; margin: 0 auto 22px; padding: 15px; background: #fff; border: 1px solid #dce4eb; border-radius: 20px; box-shadow: 0 12px 34px rgba(26,48,75,.09); }
.purchase-qr-frame img { width: 100%; height: auto; image-rendering: pixelated; }
.purchase-qr-card > strong { display: block; color: #13263f; font-size: 22px; }
.purchase-qr-card > p { margin: 7px 0 20px; color: var(--muted); font-size: 14px; }
.purchase-qr-card .button { width: 100%; }
.purchase-text-link { display: inline-block; margin-top: 16px; color: #1b6fc4; font-size: 13px; text-decoration: underline; text-underline-offset: 3px; }
.purchase-feature-section { background: #f4f7fa; }
.purchase-feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.purchase-feature-grid article { min-height: 230px; padding: 28px 24px; background: #fff; border: 1px solid #e0e8ef; border-radius: 20px; box-shadow: 0 9px 28px rgba(17,44,75,.05); }
.purchase-feature-grid article > span { color: #1680df; font-size: 12px; font-weight: 850; }
.purchase-feature-grid h3 { margin: 38px 0 9px; color: #142640; font-size: 20px; }
.purchase-feature-grid p { margin: 0; color: var(--muted); font-size: 14px; }
.purchase-setup-section { padding: 112px 0; background: #fff; }
.purchase-setup-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 0; padding: 0; list-style: none; }
.purchase-setup-grid li { display: flex; gap: 17px; min-height: 170px; padding: 26px; background: #f5f8fb; border: 1px solid #e1e8ef; border-radius: 20px; }
.purchase-setup-grid li > span { display: grid; width: 46px; height: 46px; flex: 0 0 auto; place-items: center; color: #fff; background: linear-gradient(145deg, #0877f9, #00aeda); border-radius: 14px; font-weight: 850; }
.purchase-setup-grid h3 { margin: 2px 0 7px; color: #142640; font-size: 19px; }
.purchase-setup-grid p { margin: 0; color: var(--muted); font-size: 14px; }
.purchase-note { display: flex; gap: 22px; margin-top: 24px; padding: 20px 24px; color: #37536f; background: #eaf4fd; border: 1px solid #d4e7f7; border-radius: 16px; }
.purchase-note strong { flex: 0 0 auto; color: #125fae; }
.purchase-note p { margin: 0; }

.about-page { background: #fff; }
.about-author-hero { padding: 108px 0; background: radial-gradient(circle at 78% 18%, #dfefff 0, transparent 35%), linear-gradient(145deg, #f9fbfd, #eef4f8); }
.about-author-grid { display: grid; grid-template-columns: 1.12fr .88fr; gap: 92px; align-items: center; }
.about-author-copy h1 { margin: 0; color: #0d1c32; font-size: clamp(46px, 5vw, 68px); line-height: 1.12; letter-spacing: -.045em; }
.about-author-copy > p:not(.section-kicker) { max-width: 690px; margin: 26px 0 34px; color: var(--muted); font-size: 18px; }
.about-profile-card { padding: 38px; background: rgba(255,255,255,.9); border: 1px solid #dce6ef; border-radius: 28px; box-shadow: 0 24px 64px rgba(25,49,77,.12); }
.about-profile-mark { display: grid; width: 74px; height: 74px; margin-bottom: 30px; place-items: center; color: #fff; background: linear-gradient(145deg, #0877f9, #04a8d7); border-radius: 22px; font-size: 21px; font-weight: 900; letter-spacing: .04em; }
.about-profile-card > span { display: block; color: #78899b; font-size: 13px; font-weight: 750; letter-spacing: .12em; }
.about-profile-card > strong { display: block; margin-top: 11px; color: #13263f; font-size: 28px; line-height: 1.3; }
.about-profile-card > p { margin: 9px 0 24px; color: var(--muted); }
.about-profile-card > a { color: #126fca; font-weight: 750; text-decoration: underline; text-underline-offset: 4px; }
.about-facts-section { padding: 0 0 96px; background: linear-gradient(180deg, #eef4f8 0%, #fff 100%); }
.about-facts-grid { display: grid; grid-template-columns: repeat(4, 1fr); background: #fff; border: 1px solid #dde6ee; border-radius: 24px; box-shadow: 0 18px 52px rgba(24,47,74,.08); overflow: hidden; }
.about-facts-grid article { min-height: 164px; display: flex; align-items: center; justify-content: center; flex-direction: column; padding: 24px; text-align: center; border-right: 1px solid #e2e9ef; }
.about-facts-grid article:last-child { border-right: 0; }
.about-facts-grid strong { color: #0e67cc; font-size: 34px; line-height: 1.15; }
.about-facts-grid span { margin-top: 9px; color: var(--muted); font-size: 14px; }
.about-project-section { padding: 112px 0; background: #fff; }
.about-project-card { display: grid; grid-template-columns: 1fr 420px; gap: 80px; align-items: center; padding: 58px; color: #fff; background: linear-gradient(135deg, #0b2b53, #0b4779); border-radius: 30px; box-shadow: 0 26px 70px rgba(8,35,68,.2); }
.about-project-card .section-kicker { color: #63d2ec; }
.about-project-card h2 { margin: 0; font-size: clamp(34px, 4vw, 50px); line-height: 1.2; letter-spacing: -.035em; }
.about-project-card p:not(.section-kicker) { margin: 20px 0 0; color: rgba(255,255,255,.72); font-size: 16px; }
.about-site-link { position: relative; display: flex; min-height: 150px; justify-content: center; flex-direction: column; padding: 30px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.17); border-radius: 20px; transition: background .2s ease, transform .2s ease; }
.about-site-link:hover { background: rgba(255,255,255,.15); transform: translateY(-3px); }
.about-site-link span { color: rgba(255,255,255,.6); font-size: 13px; }
.about-site-link strong { margin-top: 7px; font-size: 21px; }
.about-site-link em { position: absolute; top: 24px; right: 26px; font-size: 24px; font-style: normal; }
.about-single-section { min-height: calc(100vh - var(--header-height) - 270px); display: grid; align-items: center; padding: 96px 0; background: radial-gradient(circle at 82% 12%, #dcefff 0, transparent 32%), linear-gradient(145deg, #f8fbfd, #edf3f7); }
.about-single-card { display: grid; grid-template-columns: 1.04fr .96fr; background: #fff; border: 1px solid #dce5ed; border-radius: 32px; box-shadow: 0 30px 80px rgba(23,47,76,.13); overflow: hidden; }
.about-single-intro { position: relative; padding: 66px; background: linear-gradient(155deg, #f9fcff, #edf5fa); }
.about-single-intro::after { position: absolute; right: -72px; bottom: -88px; width: 220px; height: 220px; content: ""; background: rgba(17,122,220,.07); border-radius: 50%; }
.about-single-mark { display: grid; width: 72px; height: 72px; margin-bottom: 34px; place-items: center; color: #fff; background: linear-gradient(145deg, #0877f9, #04abd9); border-radius: 22px; box-shadow: 0 14px 34px rgba(8,119,249,.22); }
.about-single-mark span { font-size: 20px; font-weight: 900; letter-spacing: .05em; }
.about-single-intro h1 { position: relative; z-index: 1; margin: 0; color: #10223a; font-size: clamp(40px, 4.3vw, 58px); line-height: 1.16; letter-spacing: -.045em; }
.about-single-intro > p:last-child { position: relative; z-index: 1; max-width: 610px; margin: 24px 0 0; color: var(--muted); font-size: 16px; }
.about-single-detail { display: flex; justify-content: center; flex-direction: column; padding: 58px; }
.about-detail-label { margin: 0 0 18px; color: #7b8b9b; font-size: 13px; font-weight: 800; letter-spacing: .14em; }
.about-detail-list { display: grid; gap: 13px; margin: 0; padding: 0; list-style: none; }
.about-detail-list li { display: flex; gap: 11px; align-items: center; color: #263d56; font-size: 16px; }
.about-detail-list li span { display: grid; width: 24px; height: 24px; flex: 0 0 auto; place-items: center; color: #16805a; background: #e3f5ec; border-radius: 50%; font-size: 12px; font-weight: 900; }
.about-project-note { margin-top: 30px; padding: 20px; background: #f4f8fb; border: 1px solid #e0e9f0; border-radius: 16px; }
.about-project-note strong { color: #153351; font-size: 16px; }
.about-project-note p { margin: 5px 0 0; color: var(--muted); font-size: 13px; }
.about-single-link { display: flex; min-height: 54px; align-items: center; justify-content: space-between; gap: 18px; margin-top: 18px; padding: 0 18px 0 20px; color: #fff; background: #126fd1; border-radius: 14px; font-weight: 750; transition: background .2s ease, transform .2s ease; }
.about-single-link:hover { background: #075dbb; transform: translateY(-2px); }
.about-single-link em { font-size: 21px; font-style: normal; }

.placeholder-main { min-height: calc(100vh - var(--header-height) - 270px); display: grid; place-items: center; padding: 80px 0; background: radial-gradient(circle at 50% 15%, #e8f4ff, transparent 42%), #f5f8fc; }
.placeholder-card { max-width: 720px; padding: 70px 42px; text-align: center; background: #fff; border: 1px solid #e2eaf3; border-radius: 28px; box-shadow: var(--shadow); }
.placeholder-icon { display: grid; width: 74px; height: 74px; margin: 0 auto 24px; place-items: center; color: var(--blue-600); background: #eaf4ff; border-radius: 22px; }
.placeholder-icon svg { width: 36px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.placeholder-card h1 { margin: 0; font-size: clamp(36px, 5vw, 54px); }
.placeholder-card p { margin: 16px auto 30px; color: var(--muted); }

:focus-visible { outline: 3px solid #20c9fa; outline-offset: 3px; }

@media (max-width: 1024px) {
  .section { padding: 88px 0; }
  .split-layout, .trust-grid { gap: 44px; }
  .split-layout { grid-template-columns: .9fr 1.1fr; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .showcase-row { gap: 46px; }
  .trust-grid { grid-template-columns: 1fr; }
  .trust-copy { max-width: 760px; }
  .trust-gallery { width: min(100%, 760px); }
  .purchase-hero-grid { gap: 44px; }
  .purchase-buy-grid { grid-template-columns: 1fr 360px; gap: 52px; }
  .purchase-feature-grid { grid-template-columns: repeat(2, 1fr); }
  .about-author-grid { gap: 52px; }
  .about-project-card { grid-template-columns: 1fr 340px; gap: 44px; }
  .about-single-intro { padding: 50px; }
  .about-single-detail { padding: 46px; }
}

@media (max-width: 768px) {
  :root { --header-height: 64px; }
  .container, .nav-shell { width: min(calc(100% - 32px), var(--container)); }
  .menu-toggle { display: block; }
  .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .primary-nav { position: absolute; top: var(--header-height); left: 0; right: 0; height: auto; display: none; padding: 10px 16px 18px; flex-direction: column; gap: 2px; background: rgba(255,255,255,.98); border-bottom: 1px solid var(--line); box-shadow: 0 16px 28px rgba(5,31,68,.11); }
  .primary-nav.is-open { display: flex; }
  .primary-nav a { width: 100%; height: 48px; justify-content: flex-start; padding-inline: 14px; border-radius: 9px; }
  .primary-nav a::after { display: none; }
  .primary-nav a.active { background: #eef6ff; }
  .hero-carousel { min-height: 590px; height: calc(100svh - var(--header-height)); max-height: 720px; }
  .hero-slide > img { object-position: 60% center; }
  .hero-overlay { background: linear-gradient(90deg, rgba(2,13,31,.88) 0%, rgba(2,13,31,.68) 56%, rgba(2,13,31,.18) 100%); }
  .hero-content { justify-content: flex-end; padding-bottom: 95px; }
  .hero-content h1, .hero-content h2 { font-size: clamp(42px, 10vw, 60px); }
  .hero-content > p:not(.eyebrow) { max-width: 480px; margin: 18px 0 25px; }
  .carousel-arrow { top: auto; bottom: 22px; width: 42px; height: 42px; transform: none; }
  .carousel-prev { left: 16px; }
  .carousel-next { right: 16px; }
  .carousel-dots { bottom: 39px; }
  .stats-grid { grid-template-columns: 1fr 1fr; padding: 18px 0; }
  .stats-grid > div { min-height: 88px; }
  .stats-grid > div:nth-child(2) { border-right: 0; }
  .stats-grid > div:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,.12); }
  .section { padding: 74px 0; }
  .split-layout, .showcase-row { grid-template-columns: 1fr; }
  .split-layout { gap: 40px; }
  .showcase-row { gap: 32px; padding: 48px 0; }
  .showcase-reverse .showcase-image { order: 0; }
  .section-heading { margin-bottom: 40px; }
  .feature-grid { gap: 18px; }
  .purchase-cta-inner { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; gap: 34px; }
  .purchase-hero { padding: 62px 0 72px; }
  .purchase-hero-grid, .purchase-buy-grid { grid-template-columns: 1fr; }
  .purchase-product-visual { width: min(100%, 620px); }
  .purchase-buy-section, .purchase-setup-section { padding: 76px 0; }
  .purchase-qr-card { width: min(100%, 430px); }
  .purchase-setup-grid { grid-template-columns: 1fr; }
  .about-author-hero { padding: 78px 0; }
  .about-author-grid, .about-project-card { grid-template-columns: 1fr; }
  .about-profile-card { width: min(100%, 620px); }
  .about-facts-grid { grid-template-columns: repeat(2, 1fr); }
  .about-facts-grid article:nth-child(2) { border-right: 0; }
  .about-facts-grid article:nth-child(-n+2) { border-bottom: 1px solid #e2e9ef; }
  .about-project-section { padding: 76px 0; }
  .about-project-card { padding: 38px; }
  .about-single-section { padding: 70px 0; }
  .about-single-card { grid-template-columns: 1fr; }
  .about-single-intro, .about-single-detail { padding: 42px; }
}

@media (max-width: 520px) {
  .brand { font-size: 17px; }
  .brand-mark { width: 30px; height: 30px; }
  .hero-carousel { min-height: 610px; max-height: 720px; }
  .hero-slide > img { object-position: 63% center; }
  .hero-overlay { background: linear-gradient(90deg, rgba(2,13,31,.94) 0%, rgba(2,13,31,.75) 62%, rgba(2,13,31,.35) 100%); }
  .hero-content h1, .hero-content h2 { font-size: 43px; }
  .hero-content > p:not(.eyebrow) { font-size: 15px; }
  .eyebrow { font-size: 12px; letter-spacing: .13em; }
  .carousel-dots button { width: 22px; }
  .carousel-dots button.is-active { width: 38px; }
  .stats-grid strong { font-size: 26px; }
  .stats-grid span { font-size: 12px; }
  .section-copy h2, .section-heading h2, .trust-copy h2 { font-size: 32px; }
  .section-lead, .section-heading > p:last-child { font-size: 15px; }
  .feature-grid { grid-template-columns: 1fr; }
  .product-visual, .showcase-image { padding: 9px; border-radius: 20px; }
  .product-visual img, .showcase-image img { border-radius: 13px; }
  .showcase-copy h3 { font-size: 29px; }
  .trust-points { grid-template-columns: 1fr; }
  .advantage-grid { grid-template-columns: 1fr; }
  .trust-points > div { min-height: 88px; }
  .trust-gallery { grid-template-columns: 1fr; }
  .author-asset { transform: none; }
  .trust-copy { padding-top: 0; }
  .purchase-cta { padding: 58px 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > div:first-child { grid-column: 1 / -1; }
  .placeholder-card { padding: 54px 24px; }
  .purchase-hero-copy h1 { font-size: 42px; }
  .purchase-lead { font-size: 15px; }
  .purchase-actions .button { width: 100%; }
  .purchase-feature-grid { grid-template-columns: 1fr; }
  .purchase-qr-card { padding: 24px 18px; }
  .purchase-qr-frame { width: min(230px, 100%); }
  .purchase-note { flex-direction: column; gap: 6px; }
  .about-author-copy h1 { font-size: 40px; }
  .about-author-copy > p:not(.section-kicker) { font-size: 15px; }
  .about-profile-card { padding: 28px 24px; }
  .about-facts-grid article { min-height: 132px; padding: 18px 12px; }
  .about-facts-grid strong { font-size: 27px; }
  .about-facts-grid span { font-size: 12px; }
  .about-project-card { padding: 30px 24px; }
  .about-single-section { padding: 46px 0; }
  .about-single-card { border-radius: 24px; }
  .about-single-intro, .about-single-detail { padding: 30px 24px; }
  .about-single-mark { width: 60px; height: 60px; margin-bottom: 26px; border-radius: 18px; }
  .about-single-intro h1 { font-size: 34px; }
  .about-single-intro > p:last-child { font-size: 14px; }
  .about-detail-list li { font-size: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}