:root {
  --navy: #102a43;
  --blue: #145a86;
  --sky: #2f8db8;
  --cyan: #55bfd4;
  --ice: #eaf5fa;
  --orange: #f15a29;
  --paper: #f8fbfc;
  --ink: #16324a;
  --muted: #5f7484;
  --line: #d3e2e9;
  --white: #fff;
  --shadow: 0 18px 45px rgba(16, 42, 67, .12);
  --label-font: "Trebuchet MS", "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: Inter, "Segoe UI", Arial, sans-serif; font-size: 16px; line-height: 1.6; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
.shell { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }
.skip-link { position: absolute; left: -999px; top: 10px; z-index: 20; background: var(--orange); color: var(--white); padding: 8px 14px; }
.skip-link:focus { left: 10px; }

.site-header { background: var(--white); border-bottom: 1px solid var(--line); }
.topline { height: 5px; background: linear-gradient(90deg, var(--orange) 0 12%, var(--navy) 12% 55%, var(--sky) 55% 78%, var(--cyan) 78% 100%); }
.header-inner { min-height: 92px; display: flex; align-items: center; gap: 36px; }
.brand { display: flex; align-items: center; gap: 13px; min-width: 275px; }
.brand-mark { width: 43px; height: 43px; display: grid; place-items: center; }
.brand-mark img { width: 43px; height: 43px; }
.brand-copy { display: grid; gap: 1px; line-height: 1.1; }
.brand-copy strong { letter-spacing: .12em; font-size: 15px; color: var(--navy); }
.brand-copy small { font-family: var(--label-font); font-size: 9px; letter-spacing: .13em; color: var(--sky); font-weight: 900; }
.main-nav { display: flex; align-items: center; gap: 28px; margin-left: auto; }
.main-nav a { color: var(--muted); font-size: 14px; font-weight: 600; position: relative; padding: 12px 0; }
.main-nav a:hover, .main-nav a.active { color: var(--navy); }
.main-nav a.active::after { content: ""; position: absolute; height: 3px; left: 0; right: 0; bottom: 0; background: var(--orange); }
.header-link { border: 1px solid var(--navy); padding: 9px 14px; color: var(--navy); font-size: 13px; font-weight: 700; }
.header-link:hover { background: var(--navy); color: var(--white); }

.hero { display: grid; grid-template-columns: 1fr .91fr; gap: 70px; align-items: center; min-height: 610px; padding: 82px 0 90px; }
.eyebrow { display: flex; align-items: center; gap: 10px; margin: 0 0 18px; color: var(--sky); font-family: var(--label-font); font-size: 11px; letter-spacing: .16em; font-weight: 900; }
.eyebrow span { width: 25px; height: 3px; background: var(--orange); display: inline-block; }
.eyebrow.light { color: #b9dfed; }
.hero h1 { margin: 0; max-width: 550px; color: var(--navy); font-size: clamp(42px, 5.3vw, 72px); font-weight: 800; letter-spacing: -.055em; line-height: 1.04; }
em { color: var(--orange); font-style: normal; }
.hero-lead { max-width: 500px; margin: 28px 0 30px; color: var(--muted); font-size: 18px; line-height: 1.65; }
.hero-actions { display: flex; align-items: center; gap: 27px; flex-wrap: wrap; }
.button { display: inline-flex; align-items: center; gap: 28px; padding: 14px 19px; font-size: 14px; font-weight: 750; }
.button-primary { background: var(--navy); color: var(--white); box-shadow: 0 8px 20px rgba(16, 42, 67, .18); }
.button-primary:hover { background: var(--blue); }
.button span { color: var(--orange); font-size: 20px; line-height: 1; }
.text-link { color: var(--navy); font-size: 13px; font-weight: 750; }
.text-link span, .arrow-link span { color: var(--orange); margin-left: 8px; font-size: 18px; }
.text-link:hover, .arrow-link:hover { color: var(--sky); }
.hero-note { display: flex; align-items: center; gap: 10px; margin-top: 46px; color: var(--muted); font-size: 12px; }
.note-bar { width: 28px; height: 1px; background: var(--orange); }
.hero-visual { position: relative; padding: 0 22px 22px 0; }
.hero-image-wrap { position: relative; overflow: hidden; background: var(--navy); box-shadow: var(--shadow); }
.hero-image-wrap::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 45%, rgba(16, 42, 67, .78)); pointer-events: none; }
.hero-image-wrap img { width: 100%; aspect-ratio: 1.5; object-fit: cover; }
.image-caption { position: absolute; z-index: 1; bottom: 18px; left: 22px; right: 22px; display: flex; align-items: center; gap: 11px; color: var(--white); font-family: var(--label-font); font-size: 11px; letter-spacing: .03em; line-height: 1.45; font-weight: 900; }
.caption-dot { width: 7px; height: 7px; background: var(--orange); border-radius: 50%; }
.hero-image-wrap .caption-dot { width: 4px; height: 32px; flex: 0 0 4px; border-radius: 0; }
.image-caption-copy { max-width: 355px; }
.image-caption b { margin-left: auto; color: var(--cyan); font-size: 12px; letter-spacing: .08em; font-weight: 900; white-space: nowrap; }
.hero-badge { position: absolute; right: -5px; bottom: 1px; z-index: 2; display: flex; align-items: center; gap: 8px; background: var(--orange); color: var(--white); padding: 12px 15px 12px 12px; box-shadow: 0 8px 20px rgba(241, 90, 41, .2); }
.hero-badge strong { font-size: 22px; letter-spacing: .08em; }
.hero-badge span { font-family: var(--label-font); font-size: 10px; line-height: 1.2; text-transform: uppercase; letter-spacing: .08em; font-weight: 900; }

.section { padding: 90px 0; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 34px; }
.section-heading .eyebrow { margin-bottom: 9px; }
h2 { margin: 0; color: var(--navy); font-size: clamp(30px, 3vw, 43px); letter-spacing: -.04em; line-height: 1.1; font-weight: 800; }
.featured-grid { display: grid; grid-template-columns: 1.45fr .75fr; gap: 24px; }
.featured-card, .side-card { background: var(--white); border: 1px solid var(--line); }
.featured-card { display: grid; grid-template-columns: 1fr .98fr; }
.featured-image, .side-card-image { position: relative; overflow: hidden; }
.featured-image img, .side-card-image img { width: 100%; height: 100%; object-fit: cover; min-height: 290px; transition: transform .4s ease; }
.featured-card:hover img, .side-card:hover img { transform: scale(1.04); }
.card-label { position: absolute; top: 16px; left: 16px; color: var(--white); font-family: var(--label-font); padding: 4px 8px; font-size: 10px; letter-spacing: .08em; font-weight: 900; }
.label-orange { background: var(--orange); }
.label-blue { background: var(--blue); }
.featured-content, .side-card-content { padding: 29px; }
.meta { margin: 0 0 13px; color: var(--sky); font-family: var(--label-font); font-size: 10px; letter-spacing: .1em; font-weight: 900; }
h3 { margin: 0; color: var(--navy); font-size: 22px; line-height: 1.22; letter-spacing: -.025em; font-weight: 800; }
.featured-content p:not(.meta) { color: var(--muted); font-size: 14px; line-height: 1.65; margin: 18px 0 26px; }
.arrow-link { color: var(--navy); font-size: 13px; font-weight: 900; }
.coming-soon { display: inline-block; color: var(--muted); font-family: var(--label-font); font-size: 10px; letter-spacing: .1em; font-weight: 900; }
.side-card { display: grid; grid-template-rows: 1fr auto; }
.side-card-image img { min-height: 220px; }
.side-card-content { padding-top: 23px; padding-bottom: 24px; }
.side-card-content h3 { font-size: 20px; margin-bottom: 22px; }

.topics-band { background: var(--navy); color: var(--white); padding: 75px 0; position: relative; overflow: hidden; }
.topics-band::after { content: ""; position: absolute; width: 390px; height: 390px; border: 1px solid rgba(85, 191, 212, .25); border-radius: 50%; right: -120px; top: -160px; box-shadow: 0 0 0 35px rgba(85, 191, 212, .04), 0 0 0 70px rgba(85, 191, 212, .025); }
.topic-inner { display: grid; grid-template-columns: .85fr 1.15fr; gap: 90px; align-items: center; position: relative; z-index: 1; }
.topics-band h2 { color: var(--white); max-width: 360px; }
.topic-list { border-top: 1px solid rgba(234, 245, 250, .25); }
.topic-list a { display: flex; align-items: center; gap: 18px; min-height: 57px; border-bottom: 1px solid rgba(234, 245, 250, .25); color: #e8f5f8; font-size: 15px; font-weight: 650; }
.topic-list a:hover { color: var(--cyan); padding-left: 5px; }
.topic-list span { color: var(--cyan); font-family: var(--label-font); font-size: 11px; letter-spacing: .1em; font-weight: 900; }
.topic-list b { margin-left: auto; color: var(--orange); font-size: 18px; font-weight: 500; }
.section-intro { max-width: 365px; margin: 0; color: var(--muted); font-size: 14px; }
.notes-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.note-card { padding: 21px; border-top: 3px solid var(--sky); background: var(--white); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); border-left: 1px solid var(--line); }
.note-card:nth-child(2), .note-card:nth-child(6) { border-top-color: var(--cyan); }
.note-card:nth-child(3), .note-card:nth-child(7) { border-top-color: var(--orange); }
.note-card:nth-child(4), .note-card:nth-child(8) { border-top-color: var(--blue); }
.topic-card { min-height: 220px; }
.topic-card-top { display: flex; align-items: start; justify-content: space-between; gap: 14px; margin-bottom: 18px; }
.number { color: var(--orange); font-size: 22px; font-weight: 700; line-height: 1; letter-spacing: -.04em; white-space: nowrap; }
.topic-icon { width: 34px; height: 34px; stroke: var(--blue); stroke-width: 1.6; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.topic-card .meta { margin-bottom: 8px; }
.topic-card h3 { font-size: 18px; margin-bottom: 10px; }
.topic-summary { color: var(--muted); font-size: 13px; line-height: 1.55; margin: 0; }

.reference-strip { background: var(--blue); color: var(--white); padding: 76px 0; }
.reference-heading { align-items: end; }
.reference-heading h2 { max-width: 650px; color: var(--white); }
.reference-heading .section-intro { color: #d9edf4; }
.reference-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.reference-card { display: block; min-height: 245px; padding: 28px; background: var(--white); border-top: 5px solid var(--orange); transition: transform .2s ease, box-shadow .2s ease; }
.reference-card:nth-child(2) { border-top-color: var(--cyan); }
.reference-card:nth-child(3) { border-top-color: var(--navy); }
.reference-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.reference-card > span { color: var(--orange); font-family: var(--label-font); font-size: 12px; letter-spacing: .12em; font-weight: 900; }
.reference-card h3 { margin: 15px 0 12px; font-size: 23px; }
.reference-card p { margin: 0 0 24px; color: var(--muted); font-size: 14px; line-height: 1.65; }
.reference-card b { color: var(--blue); font-size: 13px; }

.resource-page { padding: 68px 0 95px; }
.resource-page > h1 { margin: 0; color: var(--navy); font-size: clamp(38px, 5vw, 64px); letter-spacing: -.05em; line-height: 1.06; }
.resource-lead { max-width: 760px; margin: 24px 0 38px; color: var(--muted); font-size: 18px; }
.resource-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.resource-card { background: var(--white); border: 1px solid var(--line); border-top: 3px solid var(--sky); padding: 24px; }
.resource-card:nth-child(2n) { border-top-color: var(--orange); }
.resource-card h2 { font-size: 23px; margin-bottom: 12px; }
.resource-card p { margin: 8px 0; color: var(--muted); font-size: 14px; }
.resource-card .formula { padding: 12px 14px; background: var(--ice); color: var(--navy); font-weight: 800; }
.resource-card .term-en { color: var(--blue); font-size: 13px; font-weight: 800; }

.quality-strip { background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 70px 0; }
.quality-inner { display: grid; grid-template-columns: .8fr 1.2fr; gap: 65px; align-items: start; }
.quality-heading h2 { max-width: 320px; font-size: 32px; }
.quality-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.quality-item { border-left: 2px solid var(--sky); padding: 0 0 0 16px; }
.quality-item:nth-child(2) { border-left-color: var(--cyan); }
.quality-item:nth-child(3) { border-left-color: var(--orange); }
.quality-item > span { color: var(--orange); font-family: var(--label-font); font-size: 11px; letter-spacing: .08em; font-weight: 900; }
.quality-item h3 { margin: 9px 0 10px; font-size: 17px; }
.quality-item p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.55; }
.quality-note { grid-column: 2; margin: 3px 0 0; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.quality-note strong { color: var(--navy); }

.about-strip { background: var(--ice); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 70px 0; }
.about-inner { display: grid; grid-template-columns: 100px 1fr 1fr; gap: 35px; align-items: center; }
.about-mark { width: 78px; height: 78px; display: grid; place-items: center; background: var(--white); border: 1px solid var(--line); }
.about-mark img { width: 57px; height: 57px; }
.about-inner h2 { font-size: 35px; }
.about-copy { color: var(--muted); font-size: 15px; line-height: 1.7; max-width: 455px; }
.about-copy p { margin: 0 0 12px; }
.about-copy p:last-child { margin-bottom: 0; }

.site-footer { background: #0c2236; color: #c6dbe4; }
.footer-main { display: grid; grid-template-columns: 1.7fr 1fr 1.2fr; gap: 60px; padding: 55px 0 47px; }
.footer-brand img { width: 49px; height: 49px; margin-bottom: 14px; }
.footer-brand p { margin: 0; color: #86a7b5; font-size: 13px; line-height: 1.6; }
.footer-col { display: grid; align-content: start; gap: 9px; }
.footer-title { margin: 0 0 10px; color: var(--cyan); font-family: var(--label-font); font-size: 10px; letter-spacing: .12em; font-weight: 900; }
.footer-col a { color: #c6dbe4; font-size: 13px; }
.footer-col a:hover { color: var(--orange); }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid rgba(198, 219, 228, .2); padding: 18px 0 25px; color: #7693a1; font-size: 11px; }
.article-page { padding: 68px 0 95px; }
.article-top { display: flex; justify-content: space-between; align-items: center; gap: 20px; margin-bottom: 35px; }
.back-link { color: var(--blue); font-size: 13px; font-weight: 750; }
.back-link:hover { color: var(--orange); }
.article-page > h1 { margin: 0; color: var(--navy); font-size: clamp(38px, 5.5vw, 70px); letter-spacing: -.055em; line-height: 1.06; }
.article-lead { max-width: 690px; margin: 25px 0 38px; color: var(--muted); font-size: 18px; line-height: 1.7; }
.article-cover { position: relative; overflow: hidden; max-width: 930px; margin-bottom: 58px; box-shadow: var(--shadow); }
.article-cover img { width: 100%; max-height: 475px; object-fit: cover; }
.article-cover .image-caption { bottom: 20px; }
.article-layout { max-width: 850px; }
.article-body { color: var(--ink); font-size: 17px; line-height: 1.78; }
.article-body h2 { font-size: 30px; margin: 42px 0 13px; }
.article-body p { margin: 0 0 22px; }
.decision-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 34px 0 38px; }
.decision-card { border: 1px solid var(--line); border-top: 3px solid var(--sky); background: var(--white); padding: 21px; }
.decision-card:nth-child(2) { border-top-color: var(--cyan); }
.decision-card.risk-card { border-top-color: var(--orange); }
.decision-card > span { color: var(--blue); font-family: var(--label-font); font-size: 10px; letter-spacing: .08em; font-weight: 900; }
.decision-card h3 { margin: 10px 0 9px; font-size: 18px; }
.decision-card p { color: var(--muted); font-size: 14px; line-height: 1.55; margin: 0; }
.source-box { border-left: 3px solid var(--cyan); background: var(--ice); padding: 18px 22px; font-size: 14px; }
.source-box p { margin: 5px 0; }
.article-warning { border: 1px solid rgba(241, 90, 41, .36); border-left: 4px solid var(--orange); background: #fff8f4; padding: 20px 22px; margin-top: 32px; }
.article-warning strong { color: var(--orange); }
.article-warning p { color: var(--muted); font-size: 14px; margin: 8px 0 0; }
.application-note { background: var(--orange); border-top: 4px solid var(--navy); border-bottom: 1px solid var(--navy); color: var(--navy); padding: 62px 0 68px; }
.application-note-inner { max-width: 900px; padding-left: 24px; border-left: 5px solid var(--navy); }
.application-note .eyebrow { color: var(--paper); }
.application-note .eyebrow span { background: var(--navy); }
.application-note h2 { color: var(--navy); font-size: clamp(30px, 3vw, 43px); margin-bottom: 18px; }
.application-note p:not(.eyebrow) { max-width: 850px; margin: 0 0 14px; color: var(--navy); font-size: 16px; line-height: 1.7; }
.application-note-small { color: var(--ink) !important; font-size: 14px !important; }

@media (max-width: 900px) {
  .header-inner { gap: 18px; }
  .brand { min-width: auto; }
  .main-nav { gap: 15px; }
  .header-link { display: none; }
  .hero { grid-template-columns: 1fr; gap: 45px; padding-top: 62px; }
  .hero-visual { max-width: 650px; width: 100%; }
  .topic-inner { gap: 45px; }
  .featured-card { grid-template-columns: 1fr; }
  .featured-image img { min-height: 320px; max-height: 390px; }
  .notes-grid { grid-template-columns: repeat(2, 1fr); }
  .reference-grid { grid-template-columns: 1fr; }
  .resource-grid { grid-template-columns: 1fr; }
}
@media (max-width: 650px) {
  .shell { width: min(100% - 32px, 1160px); }
  .header-inner { min-height: 76px; }
  .brand-copy small { font-size: 8px; }
  .main-nav { display: none; }
  .hero { min-height: auto; padding: 54px 0 64px; }
  .hero h1 { font-size: 44px; }
  .hero-lead { font-size: 16px; }
  .hero-note { margin-top: 34px; }
  .section { padding: 65px 0; }
  .section-heading { display: block; }
  .section-heading > .text-link { display: inline-block; margin-top: 18px; }
  .featured-grid, .topic-inner, .about-inner, .footer-main { grid-template-columns: 1fr; }
  .notes-grid { grid-template-columns: 1fr; }
  .quality-inner { grid-template-columns: 1fr; gap: 30px; }
  .quality-grid { grid-template-columns: 1fr; gap: 22px; }
  .quality-note { grid-column: auto; }
  .side-card-image img { min-height: 250px; }
  .topics-band { padding: 60px 0; }
  .topic-list { margin-top: 28px; }
  .about-inner { gap: 20px; }
  .about-inner h2 { font-size: 30px; }
  .article-page { padding: 48px 0 70px; }
  .article-top { display: block; }
  .article-top .meta { margin-top: 20px; }
  .article-lead { font-size: 16px; }
  .decision-grid { grid-template-columns: 1fr; }
  .footer-main { gap: 30px; padding: 45px 0 35px; }
  .footer-bottom { display: grid; gap: 5px; }
}