:root {
  --blue: #2368f0;
  --blue-dark: #1455d1;
  --navy: #0b1f45;
  --ink: #13213b;
  --muted: #647089;
  --line: #e4eaf4;
  --soft: #f5f8ff;
  --white: #fff;
  --shadow: 0 18px 48px rgba(20, 49, 105, .11);
  --shell: min(1160px, calc(100% - 40px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: #fff; font-family: "Trebuchet MS", Arial, sans-serif; line-height: 1.65; }
body.nav-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.shell { width: var(--shell); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 1000; padding: 10px 14px; color: #fff; background: var(--navy); }
.skip-link:focus { top: 16px; }
section[id] { scroll-margin-top: 92px; }

.topline { color: #56627a; background: #f7f9fd; border-bottom: 1px solid #edf1f7; font-size: 12px; }
.topline__inner { min-height: 38px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.topline p { margin: 0; }
.topline a { color: var(--ink); font-weight: 700; }

.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,.96); border-bottom: 1px solid transparent; transition: box-shadow .25s, border-color .25s; backdrop-filter: blur(10px); }
.site-header.is-scrolled { border-color: var(--line); box-shadow: 0 10px 30px rgba(17,40,83,.08); }
.header__inner { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.wordmark { display: inline-block; max-width: min(34vw, 280px); overflow: hidden; color: var(--navy); font-size: clamp(19px, 2.2vw, 28px); font-weight: 900; line-height: 1; letter-spacing: .08em; text-overflow: ellipsis; text-transform: uppercase; white-space: nowrap; }
.main-nav { display: flex; align-items: center; gap: 28px; }
.main-nav a { position: relative; color: #24334f; font-size: 14px; font-weight: 700; }
.main-nav a::after { position: absolute; content: ""; right: 0; bottom: -8px; left: 0; height: 2px; background: var(--blue); transform: scaleX(0); transition: transform .2s; }
.main-nav a:hover::after, .main-nav a:focus-visible::after { transform: scaleX(1); }
.nav-toggle { display: none; width: 44px; height: 44px; padding: 10px; border: 0; background: transparent; cursor: pointer; }
.nav-toggle span { display: block; width: 24px; height: 2px; margin: 5px auto; background: var(--navy); transition: .25s; }

.hero { position: relative; min-height: 670px; overflow: hidden; background: linear-gradient(115deg, #f4f8ff 0%, #fff 54%, #eef5ff 100%); }
.hero__grid { position: relative; z-index: 2; min-height: 620px; display: grid; grid-template-columns: 1.02fr .98fr; align-items: center; gap: 62px; padding-block: 70px 110px; }
.eyebrow { margin: 0 0 16px; color: #47546d; font-size: 11px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.eyebrow span { display: inline-block; width: 12px; height: 3px; margin: 0 7px 2px 0; background: var(--blue); border-radius: 4px; }
.eyebrow span:last-child { margin-right: 0; margin-left: 7px; }
.eyebrow--light { color: #cbd7ee; }
.hero h1 { max-width: 620px; margin: 0; color: var(--navy); font-size: clamp(48px, 5.1vw, 76px); line-height: .99; letter-spacing: -.045em; }
.hero h1 em { color: var(--blue); font-style: normal; font-weight: 800; }
.hero__lead { max-width: 610px; margin: 28px 0 32px; color: var(--muted); font-size: 17px; }
.hero__facts { display: grid; grid-template-columns: repeat(3, 1fr); max-width: 600px; border-top: 1px solid #dfe7f4; }
.hero__facts div { display: grid; gap: 2px; padding: 16px 18px 0 0; }
.hero__facts strong { color: var(--blue); font-size: 13px; }
.hero__facts span { color: #34425b; font-size: 12px; font-weight: 700; }
.hero__visual { position: relative; min-height: 480px; display: grid; place-items: center; }
.hero__image { position: relative; z-index: 2; width: min(405px, 82%); aspect-ratio: 1; padding: 14px; overflow: hidden; background: #fff; border-radius: 50%; box-shadow: var(--shadow); }
.hero__image img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.orbit { position: absolute; border: 2px solid rgba(35,104,240,.38); border-radius: 50%; }
.orbit--outer { width: 470px; height: 470px; }
.orbit--inner { width: 420px; height: 420px; border-color: rgba(35,104,240,.16); }
.floating-note { position: absolute; z-index: 3; min-width: 138px; padding: 12px 18px; color: var(--navy); background: #fff; border: 1px solid #e0e8f6; border-radius: 4px; box-shadow: 0 12px 26px rgba(24,59,125,.12); font-size: 13px; font-weight: 800; }
.floating-note span { color: var(--blue); font-size: 18px; }
.floating-note--top { top: 48px; right: -6px; }
.floating-note--bottom { bottom: 44px; left: -10px; }
.hero__shape { position: absolute; width: 380px; height: 380px; border: 1px solid rgba(35,104,240,.15); border-radius: 50%; }
.hero__shape--one { top: -260px; left: 36%; }
.hero__shape--two { right: -220px; bottom: -120px; }
.hero__wave { position: absolute; right: -3%; bottom: -60px; left: -3%; height: 115px; border-top: 3px solid var(--blue); border-radius: 50% 50% 0 0; transform: rotate(-1deg); opacity: .72; }

.section { padding: 110px 0; }
.section-heading { max-width: 710px; margin-bottom: 42px; }
.section-heading--center { margin-right: auto; margin-left: auto; text-align: center; }
.section-heading h2, .context h2, .method h2, .reading-panel h2 { margin: 0 0 18px; color: var(--navy); font-size: clamp(36px, 4.2vw, 54px); line-height: 1.08; letter-spacing: -.035em; }
.section-heading > p:last-child, .context__copy > p, .method__copy > p, .reading-panel__copy > p { color: var(--muted); }

.topics { padding-top: 100px; background: #fff; }
.topic-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.topic-card { position: relative; min-height: 325px; padding: 34px 26px 28px; border: 1px solid var(--line); background: #fff; transition: transform .25s, box-shadow .25s, border-color .25s; }
.topic-card:hover { transform: translateY(-6px); border-color: #cbd8ef; box-shadow: var(--shadow); }
.topic-card img { width: 48px; height: 48px; object-fit: contain; margin-bottom: 25px; }
.topic-card__number { position: absolute; top: 24px; right: 24px; margin: 0; color: #bcc7da; font-size: 12px; font-weight: 800; }
.topic-card h3 { margin: 0 0 12px; color: var(--navy); font-size: 20px; line-height: 1.25; }
.topic-card > p:not(.topic-card__number) { margin: 0 0 20px; color: var(--muted); font-size: 14px; }
.topic-card a { display: inline-flex; gap: 8px; color: var(--blue); font-size: 13px; font-weight: 800; }

.context { background: var(--soft); }
.context__grid, .method__grid { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 78px; }
.photo-stack { position: relative; min-height: 530px; }
.photo-stack__main { position: absolute; top: 0; right: 0; width: 76%; height: 430px; object-fit: cover; border-radius: 5px; }
.photo-stack__small { position: absolute; bottom: 0; left: 0; z-index: 2; width: 46%; height: 245px; object-fit: cover; border: 10px solid var(--soft); border-radius: 5px; }
.photo-stack__round { position: absolute; right: 0; bottom: 0; z-index: 3; width: 185px; }
.check-list { display: grid; gap: 18px; margin: 28px 0 0; padding: 0; list-style: none; }
.check-list li { display: grid; grid-template-columns: 38px 1fr; gap: 15px; }
.check-list li > span { width: 34px; height: 34px; display: grid; place-items: center; color: #fff; background: var(--blue); border-radius: 50%; font-weight: 900; }
.check-list strong { color: var(--navy); }
.check-list p { margin: 2px 0 0; color: var(--muted); font-size: 14px; }

.insight-banner { padding: 62px 0; color: #fff; background: linear-gradient(rgba(6,27,62,.88), rgba(6,27,62,.88)), url("../images/tronix/dark-section.jpg") center/cover; }
.insight-banner__inner { display: grid; grid-template-columns: 1.4fr .6fr; align-items: end; gap: 60px; }
.insight-banner h2 { max-width: 760px; margin: 0; color: #fff; font-size: clamp(32px, 4vw, 50px); line-height: 1.12; }
.insight-banner__inner > p { margin: 0 0 5px; color: #d2dbeb; }

.method__visual { padding: 36px; background: linear-gradient(145deg, #edf4ff, #fff); border-radius: 50% 16% 50% 20%; }
.step-list { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin: 34px 0 0; padding: 0; list-style: none; }
.step-list li { display: grid; grid-template-columns: 44px 1fr; gap: 12px; }
.step-list li > span { color: var(--blue); font-size: 14px; font-weight: 900; }
.step-list strong { color: var(--navy); }
.step-list p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }

.numbers { padding: 34px 0; border-block: 1px solid var(--line); }
.number-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.number-item { display: flex; align-items: center; justify-content: center; gap: 12px; min-height: 76px; border-right: 1px solid var(--line); }
.number-item:last-child { border-right: 0; }
.number-item strong { width: 42px; height: 42px; display: grid; place-items: center; color: #fff; background: var(--blue); border-radius: 50%; font-size: 12px; }
.number-item span { color: #536077; font-size: 11px; font-weight: 900; letter-spacing: .08em; }

.viewpoints { color: #fff; background: linear-gradient(rgba(8,30,67,.96), rgba(8,30,67,.96)), url("../images/tronix/notes-bg.jpg") center/cover; }
.section-heading--light h2 { color: #fff; }
.viewpoint-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.quote-card { min-height: 265px; padding: 32px; background: #fff; color: var(--ink); border-top: 4px solid var(--blue); }
.quote-card > p { margin: 0 0 34px; color: #526078; font-family: Georgia, serif; font-size: 17px; font-style: italic; }
.quote-card div { display: flex; align-items: center; gap: 12px; margin-top: auto; }
.quote-card div span { width: 38px; height: 38px; display: grid; place-items: center; color: #fff; background: var(--blue); border-radius: 50%; font-size: 11px; }
.quote-card strong { color: var(--navy); font-size: 14px; }

.examples .section-heading { margin-bottom: 34px; }
.example-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.example-card { position: relative; min-height: 390px; overflow: hidden; background: var(--navy); }
.example-card::after { position: absolute; content: ""; inset: 0; background: linear-gradient(180deg, transparent 28%, rgba(4,17,43,.9) 100%); }
.example-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.example-card:hover img { transform: scale(1.04); }
.example-card div { position: absolute; right: 24px; bottom: 24px; left: 24px; z-index: 2; color: #fff; }
.example-card span { color: #a9c5ff; font-size: 10px; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.example-card h3 { margin: 7px 0; font-size: 20px; line-height: 1.2; }
.example-card p { margin: 0; color: #dbe4f4; font-size: 12px; }

.reading-panel { padding-top: 70px; background: #fff; }
.reading-panel__inner { min-height: 485px; display: grid; grid-template-columns: 1fr .72fr; align-items: end; gap: 40px; padding: 60px 72px 0; overflow: hidden; background: linear-gradient(120deg, #edf4ff 0%, #fff 70%); border: 1px solid #dfe8f6; border-radius: 12px; }
.reading-panel__copy { align-self: center; padding-bottom: 55px; }
.reading-panel__inner > img { max-height: 430px; justify-self: center; }
.measure { margin-top: 18px; }
.measure div { display: flex; justify-content: space-between; color: #394963; font-size: 12px; font-weight: 800; }
.measure i { display: block; height: 5px; margin-top: 7px; background: linear-gradient(to right, var(--blue) var(--width), #dbe4f2 var(--width)); border-radius: 4px; }

.faq { background: var(--soft); }
.faq__grid { display: grid; grid-template-columns: .75fr 1.25fr; gap: 80px; align-items: start; }
.accordion { display: grid; gap: 12px; }
.accordion details { padding: 0 24px; background: #fff; border: 1px solid var(--line); }
.accordion summary { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; color: var(--navy); cursor: pointer; font-weight: 800; list-style: none; }
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary span { color: var(--blue); font-size: 24px; transition: transform .2s; }
.accordion details[open] summary span { transform: rotate(45deg); }
.accordion details p { margin: -3px 32px 24px 0; color: var(--muted); font-size: 14px; }

.article-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.article-card { display: grid; grid-template-columns: 44% 56%; min-height: 300px; overflow: hidden; border: 1px solid var(--line); background: #fff; }
.article-card > img { width: 100%; height: 100%; object-fit: cover; }
.article-card > div { padding: 32px 28px; }
.article-card__meta { margin: 0 0 12px; color: var(--blue); font-size: 10px; font-weight: 900; letter-spacing: .1em; }
.article-card h3 { margin: 0 0 12px; color: var(--navy); font-size: 21px; line-height: 1.25; }
.article-card div > p:last-child { color: var(--muted); font-size: 13px; }

.site-footer { padding-top: 76px; color: #d5ddef; background: linear-gradient(rgba(4,22,53,.96), rgba(4,22,53,.96)), url("../images/tronix/footer-bg.jpg") center/cover; }
.footer__grid { display: grid; grid-template-columns: 1.7fr .7fr .7fr 1fr; gap: 56px; padding-bottom: 60px; }
.wordmark--footer { color: #fff; }
.footer__brand p { max-width: 350px; color: #aebbd2; }
.footer__grid h2 { margin: 2px 0 20px; color: #fff; font-size: 15px; }
.footer__grid > div:not(.footer__brand) { display: flex; flex-direction: column; align-items: flex-start; gap: 9px; }
.footer__grid a { color: #b7c3d8; font-size: 13px; }
.footer__grid a:hover { color: #fff; }
.footer__email { overflow-wrap: anywhere; }
.footer__bottom { min-height: 70px; display: flex; justify-content: space-between; align-items: center; border-top: 1px solid rgba(255,255,255,.12); color: #93a3bf; font-size: 12px; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .55s ease, transform .55s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1050px) {
  .topic-grid, .example-grid { grid-template-columns: repeat(2, 1fr); }
  .context__grid, .method__grid { gap: 44px; }
  .viewpoint-grid { grid-template-columns: 1fr; }
  .quote-card { min-height: auto; }
  .reading-panel__inner { padding-right: 36px; padding-left: 50px; }
  .article-card { grid-template-columns: 1fr; }
  .article-card > img { height: 230px; }
}

@media (max-width: 820px) {
  :root { --shell: min(100% - 30px, 680px); }
  .topline { display: none; }
  .header__inner { min-height: 68px; }
  .nav-toggle { display: block; }
  .main-nav { position: fixed; top: 68px; right: 0; left: 0; display: grid; gap: 0; padding: 14px 20px 24px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 18px 30px rgba(15,36,77,.12); transform: translateY(-130%); opacity: 0; visibility: hidden; transition: .25s; }
  .main-nav.is-open { transform: none; opacity: 1; visibility: visible; }
  .main-nav a { padding: 13px 4px; border-bottom: 1px solid #eef2f8; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .hero__grid { grid-template-columns: 1fr; padding-block: 64px 100px; }
  .hero__visual { min-height: 430px; }
  .hero__facts { max-width: none; }
  .section { padding: 82px 0; }
  .context__grid, .method__grid, .faq__grid { grid-template-columns: 1fr; }
  .context__copy { grid-row: 1; }
  .photo-stack { min-height: 470px; }
  .insight-banner__inner { grid-template-columns: 1fr; gap: 20px; }
  .number-grid { grid-template-columns: 1fr 1fr; }
  .number-item:nth-child(2) { border-right: 0; }
  .number-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .reading-panel__inner { grid-template-columns: 1fr; padding: 50px 38px 0; }
  .reading-panel__copy { padding-bottom: 0; }
  .reading-panel__inner > img { max-height: 330px; }
  .faq__grid { gap: 30px; }
  .article-grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer__grid > div:last-child { grid-column: 1 / -1; }
}

@media (max-width: 540px) {
  .wordmark { max-width: 66vw; font-size: 20px; }
  .hero { min-height: auto; }
  .hero__grid { gap: 38px; padding-top: 52px; }
  .hero h1 { font-size: clamp(42px, 13vw, 60px); }
  .hero__lead { font-size: 15px; }
  .hero__facts { grid-template-columns: 1fr; gap: 0; }
  .hero__facts div { grid-template-columns: 34px 1fr; align-items: center; padding-top: 10px; }
  .hero__visual { min-height: 330px; }
  .hero__image { width: 82%; }
  .orbit--outer { width: 320px; height: 320px; }
  .orbit--inner { width: 280px; height: 280px; }
  .floating-note { min-width: 118px; padding: 9px 12px; font-size: 11px; }
  .floating-note--top { top: 22px; right: 0; }
  .floating-note--bottom { bottom: 22px; left: 0; }
  .section-heading h2, .context h2, .method h2, .reading-panel h2 { font-size: 36px; }
  .topic-grid, .example-grid { grid-template-columns: 1fr; }
  .topic-card { min-height: auto; }
  .photo-stack { min-height: 390px; }
  .photo-stack__main { width: 87%; height: 330px; }
  .photo-stack__small { height: 185px; border-width: 7px; }
  .photo-stack__round { width: 128px; }
  .step-list { grid-template-columns: 1fr; }
  .number-grid { grid-template-columns: 1fr; }
  .number-item { border-right: 0; border-bottom: 1px solid var(--line); }
  .number-item:last-child { border-bottom: 0; }
  .example-card { min-height: 430px; }
  .reading-panel__inner { padding: 42px 24px 0; }
  .accordion details { padding: 0 18px; }
  .accordion summary { min-height: 68px; font-size: 14px; }
  .article-card > div { padding: 25px 22px; }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 40px 24px; }
  .footer__brand, .footer__grid > div:last-child { grid-column: 1 / -1; }
  .footer__bottom { align-items: flex-start; flex-direction: column; justify-content: center; gap: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}