:root {
  --ink: #10241d;
  --paper: #f1eee4;
  --acid: #c7ff48;
  --orange: #ff6b35;
  --white: #fffef9;
  --line: rgba(16, 36, 29, .2);
  --pad: clamp(1.25rem, 4vw, 4.75rem);
  --serif: Georgia, "Times New Roman", serif;
  --sans: Arial, Helvetica, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; }
body.menu-open { overflow: hidden; }
a { color: inherit; }
img { display: block; max-width: 100%; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; padding: .8rem 1rem; background: var(--acid); color: var(--ink); }
.skip-link:focus { top: 1rem; }

.site-header { position: fixed; inset: 0 0 auto 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; min-height: 84px; padding: 0 var(--pad); color: var(--white); transition: background .3s, color .3s, min-height .3s; }
.site-header.scrolled { min-height: 68px; background: rgba(241, 238, 228, .94); color: var(--ink); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: .7rem; text-decoration: none; font-weight: 800; font-size: 1.05rem; letter-spacing: .22em; }
.brand img { width: 38px; height: 38px; }
.navigation { display: flex; align-items: center; gap: clamp(1rem, 3vw, 2.5rem); font-size: .74rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.navigation a { text-decoration: none; }
.navigation a:not(.nav-contact):hover { opacity: .58; }
.nav-contact { padding: .8rem 1rem; border: 1px solid currentColor; border-radius: 99px; }
.nav-contact:hover { background: var(--acid); border-color: var(--acid); color: var(--ink); }
.menu-toggle { display: none; color: inherit; border: 0; background: transparent; font: inherit; }

.hero { position: relative; min-height: 100svh; color: var(--white); overflow: hidden; }
.hero-photo, .hero-shade { position: absolute; inset: 0; }
.hero-photo { background: url("assets/kinshasa-boulevard.jpg") center 46% / cover no-repeat; animation: heroIn 1.4s cubic-bezier(.2,.7,.2,1) both; }
.hero-shade { background: linear-gradient(90deg, rgba(4,18,13,.86) 0%, rgba(4,18,13,.48) 47%, rgba(4,18,13,.13) 100%), linear-gradient(0deg, rgba(4,18,13,.45), transparent 50%); }
.hero-content { position: relative; z-index: 2; min-height: 100svh; display: flex; flex-direction: column; justify-content: flex-end; padding: 8rem var(--pad) 3rem; }
.eyebrow { margin: 0 0 1.4rem; font-size: .72rem; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
.eyebrow.light::before { content: ""; display: inline-block; width: 2.5rem; height: 1px; margin: 0 .8rem .25rem 0; background: var(--acid); }
.hero h1 { max-width: 1000px; margin: 0; font-family: var(--serif); font-weight: 400; font-size: clamp(3.4rem, 7.2vw, 8.3rem); line-height: .83; letter-spacing: -.055em; text-wrap: balance; }
.hero h1 em { color: var(--acid); font-weight: 400; }
.hero-bottom { display: flex; align-items: flex-end; justify-content: space-between; gap: 2rem; margin-top: clamp(2rem, 5vw, 4rem); padding-left: clamp(0rem, 20vw, 19rem); }
.hero-bottom p { max-width: 42rem; margin: 0; font-size: clamp(1rem, 1.5vw, 1.3rem); line-height: 1.45; }
.round-link { flex: 0 0 112px; aspect-ratio: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .75rem; background: var(--acid); color: var(--ink); border-radius: 50%; text-decoration: none; font-size: .7rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; transition: transform .3s; }
.round-link:hover { transform: rotate(-7deg) scale(1.05); }
.round-link span:last-child { font-size: 1.2rem; }
.hero-index { position: absolute; right: 1rem; top: 50%; z-index: 2; margin: 0; font-size: .65rem; letter-spacing: .1em; writing-mode: vertical-rl; }

.section { padding: clamp(6rem, 10vw, 10rem) var(--pad); }
.section-kicker { display: flex; gap: 1rem; align-items: center; margin-bottom: clamp(4rem, 8vw, 7.5rem); font-size: .72rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.section-kicker span { display: grid; place-items: center; width: 2.1rem; height: 2.1rem; border: 1px solid currentColor; border-radius: 50%; font-size: .62rem; }
.intro-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(18rem, .65fr); gap: clamp(3rem, 8vw, 9rem); align-items: end; }
.display { margin: 0; font-family: var(--serif); font-weight: 400; font-size: clamp(3.1rem, 6.7vw, 7.3rem); line-height: .91; letter-spacing: -.055em; }
.display i { color: var(--orange); font-weight: 400; }
.intro-copy { padding-bottom: .55rem; }
.intro-copy p { margin: 0 0 1.6rem; line-height: 1.7; color: rgba(16,36,29,.72); }
.intro-copy .lead { font-family: var(--serif); font-size: clamp(1.45rem, 2vw, 2rem); line-height: 1.3; color: var(--ink); }
.location-pill { display: inline-flex; align-items: center; gap: .65rem; margin-top: 1rem; padding: .72rem 1rem; border: 1px solid var(--line); border-radius: 99px; font-size: .68rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }
.location-pill span { width: .5rem; height: .5rem; border-radius: 50%; background: var(--orange); }

.image-break { position: relative; min-height: 82svh; background-position: center; background-size: cover; color: var(--white); overflow: hidden; }
.image-break::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(3,15,11,.65), transparent 62%); }
.image-break--city { background-image: url("assets/kinshasa-street.jpg"); background-position: center 48%; }
.image-caption { position: absolute; z-index: 2; left: var(--pad); top: 2rem; margin: 0; font-size: .65rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.image-break-quote { position: absolute; z-index: 2; left: var(--pad); bottom: clamp(2rem, 6vw, 5rem); font-family: var(--serif); font-size: clamp(3rem, 6vw, 7rem); line-height: .9; letter-spacing: -.045em; }

.dark { background: var(--ink); color: var(--white); }
.expertise-head { display: grid; grid-template-columns: 1.4fr .6fr; gap: 4rem; align-items: end; margin-bottom: 6rem; }
.expertise-head .display i { color: var(--acid); }
.expertise-head > p { max-width: 29rem; margin: 0 0 .6rem; line-height: 1.65; color: rgba(255,255,255,.65); }
.service-list { border-top: 1px solid rgba(255,255,255,.22); }
.service { display: grid; grid-template-columns: 5rem minmax(16rem, 1fr) minmax(18rem, .8fr) 2rem; gap: 1rem; align-items: center; min-height: 9rem; border-bottom: 1px solid rgba(255,255,255,.22); transition: background .25s, padding .25s; }
.service:hover { background: rgba(199,255,72,.08); padding-inline: 1rem; }
.service-number { color: var(--acid); font-size: .7rem; }
.service h3 { margin: 0; font-family: var(--serif); font-weight: 400; font-size: clamp(1.7rem, 3vw, 3.2rem); }
.service p { margin: 0; color: rgba(255,255,255,.62); line-height: 1.5; }
.service-mark { color: var(--acid); font-size: 1.8rem; font-weight: 200; }

.method-title { max-width: 68rem; }
.method-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: clamp(4rem, 8vw, 8rem); background: var(--line); border: 1px solid var(--line); }
.method-card { min-height: 26rem; padding: clamp(1.5rem, 3vw, 3rem); background: var(--paper); display: flex; flex-direction: column; }
.method-card > span { align-self: flex-end; display: grid; place-items: center; width: 2.5rem; height: 2.5rem; border: 1px solid var(--line); border-radius: 50%; font-size: .7rem; }
.method-card h3 { margin: auto 0 1.2rem; font-family: var(--serif); font-size: clamp(2.4rem, 4vw, 4rem); font-weight: 400; }
.method-card p { max-width: 22rem; margin: 0; line-height: 1.6; color: rgba(16,36,29,.68); }

.river { position: relative; min-height: 78svh; display: grid; place-items: center; color: var(--white); overflow: hidden; }
.river-image { position: absolute; inset: 0; background: url("assets/congo-river.jpg") center / cover no-repeat; }
.river::after { content: ""; position: absolute; inset: 0; background: rgba(7,26,19,.45); }
.river-message { position: relative; z-index: 2; width: 100%; padding: var(--pad); text-align: center; }
.river-message h2 { margin: 0; font-family: var(--serif); font-size: clamp(3.4rem, 7vw, 8rem); line-height: .9; font-weight: 400; letter-spacing: -.055em; }
.river-message h2 i { color: var(--acid); }
.river-message .eyebrow::before { display: none; }

.for-whom { background: var(--acid); }
.big-line { max-width: 100rem; margin: 0; font-family: var(--serif); font-size: clamp(2.4rem, 5vw, 5.8rem); line-height: 1.12; letter-spacing: -.035em; }
.big-line span { color: var(--orange); }

.contact-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 5rem; align-items: end; }
.contact .section-kicker { margin-bottom: 4rem; }
.contact .display i { color: var(--acid); }
.contact-side > p { max-width: 32rem; margin: 0 0 5rem; font-family: var(--serif); font-size: clamp(1.5rem, 2.4vw, 2.5rem); line-height: 1.3; }
.contact-status { border-top: 1px solid rgba(255,255,255,.25); }
.contact-status span { display: block; padding: 1.1rem 0; border-bottom: 1px solid rgba(255,255,255,.25); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: rgba(255,255,255,.7); }

.footer { display: grid; grid-template-columns: 1fr auto auto auto; gap: 2rem; align-items: center; padding: 2.2rem var(--pad); background: var(--white); color: var(--ink); font-size: .68rem; letter-spacing: .07em; text-transform: uppercase; }
.footer p { margin: 0; }
.footer-brand { font-size: .95rem; }
.credits { position: relative; }
.credits summary { cursor: pointer; }
.credits p { position: absolute; right: 0; bottom: 1.6rem; width: 19rem; padding: 1rem; background: var(--ink); color: var(--white); line-height: 1.5; text-transform: none; }

.reveal { opacity: 0; transform: translateY(30px); transition: opacity .75s ease, transform .75s cubic-bezier(.2,.7,.2,1); }
.reveal.visible { opacity: 1; transform: none; }
@keyframes heroIn { from { transform: scale(1.07); filter: brightness(.65); } to { transform: scale(1); filter: brightness(1); } }

@media (max-width: 860px) {
  .site-header { min-height: 70px; }
  .menu-toggle { display: inline-flex; align-items: center; gap: .7rem; z-index: 2; font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; cursor: pointer; }
  .menu-lines, .menu-lines::before { display: block; width: 1.5rem; height: 1px; background: currentColor; transition: transform .25s; }
  .menu-lines { position: relative; }
  .menu-lines::before { content: ""; position: absolute; top: -.45rem; }
  .menu-open .menu-lines { transform: rotate(45deg); }
  .menu-open .menu-lines::before { top: 0; transform: rotate(90deg); }
  .navigation { position: fixed; inset: 0; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; gap: 1.5rem; padding: var(--pad); background: var(--ink); color: var(--white); transform: translateX(100%); transition: transform .35s cubic-bezier(.2,.7,.2,1); }
  .navigation a { font-family: var(--serif); font-size: 2.5rem; letter-spacing: -.03em; text-transform: none; }
  .menu-open .navigation { transform: none; }
  .hero-bottom { padding-left: 0; }
  .intro-grid, .expertise-head, .contact-grid { grid-template-columns: 1fr; }
  .intro-grid { gap: 3rem; }
  .service { grid-template-columns: 3rem 1fr 1.5rem; padding: 2rem 0; }
  .service p { grid-column: 2 / 4; }
  .method-grid { grid-template-columns: 1fr; }
  .method-card { min-height: 21rem; }
  .footer { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .hero h1 { font-size: clamp(3.15rem, 15vw, 5rem); }
  .hero-bottom { align-items: flex-start; }
  .hero-bottom p { max-width: 70%; font-size: .9rem; }
  .round-link { flex-basis: 88px; font-size: .58rem; }
  .image-break { min-height: 68svh; }
  .service { grid-template-columns: 2.2rem 1fr 1.3rem; }
  .service p { font-size: .9rem; }
  .footer { grid-template-columns: 1fr; }
  .credits p { left: 0; right: auto; }
}

@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; }
}