.site-header { background: #fff; border-bottom: 1px solid var(--lasa-border); position: sticky; top: 0; z-index: 30; }
.site-header__inner { min-height: 88px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.site-brand { display: inline-block; flex: none; }
.site-brand img { width: 240px; }
.desktop-nav { display: flex; gap: 30px; align-items: center; }
.desktop-nav > a:not(.lasa-btn) { font-size: 15px; font-weight: 650; text-decoration: none; }
.desktop-nav > a:hover { color: var(--lasa-blue); }
.desktop-nav > .lasa-btn:hover { color: white; }
.mobile-nav { display: none; position: relative; }
.mobile-nav summary { cursor: pointer; border: 1px solid var(--lasa-border); border-radius: 8px; padding: 9px 14px; font-size: 14px; font-weight: 700; }
.mobile-nav nav { position: absolute; right: 0; top: calc(100% + 16px); width: 250px; max-width: calc(100vw - 40px); padding: 12px; border: 1px solid var(--lasa-border); border-radius: 12px; background: white; box-shadow: var(--lasa-shadow); }
.mobile-nav nav a { display: block; padding: 12px; font-size: 15px; text-decoration: none; border-radius: 6px; }
.mobile-nav nav a:hover { background: var(--lasa-ice); }
.hero { position: relative; overflow: hidden; isolation: isolate; background: var(--lasa-navy); color: white; }
.hero::before { content: ""; position: absolute; z-index: -1; width: 100%; height: 100%; right: 0; top: 0; background: url("../assets/motifs/diagonales-hero.svg") right center / auto 100% no-repeat; }
.hero__inner { display: grid; grid-template-columns: .98fr 1.02fr; gap: 52px; padding-block: 64px; align-items: center; }
.hero h1 { margin-bottom: 22px; }
.hero h1 span { color: var(--lasa-blue); }
.hero .lasa-lead { color: var(--lasa-on-dark); max-width: 37ch; margin-bottom: 30px; }
.hero__media { min-width: 0; margin: 0; padding: 0; background: var(--lasa-ice); border-radius: 13px; clip-path: polygon(0 0,92% 0,100% 11%,100% 100%,0 100%); box-shadow: 0 24px 60px rgba(0,0,0,.15); }
.hero__media img { width: 100%; aspect-ratio: 1100/752; object-fit: cover; }
.hero__copy { animation: lasa-appear 480ms var(--lasa-ease) both; }
@keyframes lasa-appear { from { opacity: 0; transform: translateY(10px); } to { opacity:1; transform:translateY(0); } }
.section-heading { display: flex; justify-content: space-between; gap: 40px; align-items: flex-end; margin-bottom: 32px; }
.section-heading h2 { margin-bottom: 0; }
.section-heading p { margin: 0; max-width: 47ch; color: var(--lasa-muted); font-size: 17px; }
.project-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 42px 32px; }
.project-card { min-width: 0; }
.project-card__image { display: block; background: var(--lasa-ice); border-radius: var(--lasa-radius); overflow: hidden; border: 1px solid var(--lasa-border); }
.project-card__image img { width: 100%; aspect-ratio: 1100/752; object-fit: contain; transition: transform 220ms var(--lasa-ease); }
.project-card__image:hover img { transform: scale(1.015); }
.project-card__body { display: grid; grid-template-columns: 1fr 1.25fr; gap: 24px; padding: 20px 2px 0; }
.project-card__body h3 { margin: 0 0 5px; }
.project-card__body h3 a { text-decoration: none; }
.project-card__body h3 a:hover { color: var(--lasa-blue); }
.project-card__body p { font-size: 15px; color: var(--lasa-muted); margin: 0; }
.project-card__type { font-size: 13px !important; }
.project-card .lasa-tags { margin-top: 13px; }
.services-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 18px; margin-top: 34px; }
.service { padding: 26px 24px; border: 1px solid var(--lasa-border); border-radius: var(--lasa-radius); background: white; }
.service img { margin-bottom: 25px; }
.service h3 { font-size: 21px; margin: 0 0 12px; }
.service p { font-size: 15px; color: var(--lasa-muted); margin-bottom: 0; }
.method-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 24px; list-style: none; padding: 0; margin: 40px 0 0; }
.method-grid li { border-top: 2px solid var(--lasa-border); padding-top: 20px; }
.method-grid .number { color: var(--lasa-blue); font-family: var(--lasa-display); font-weight: 800; font-size: 17px; display: block; margin-bottom: 22px; }
.method-grid h3 { font-size: 21px; margin-bottom: 12px; }
.method-grid p { font-size: 15px; color: var(--lasa-muted); }
.promise { padding: 30px 36px; margin-top: 38px; border-radius: var(--lasa-radius); background: var(--lasa-ice); display: flex; gap: 24px; align-items: center; }
.promise p { margin: 0; font-size: 17px; }
.contact { background: var(--lasa-navy); color: white; position: relative; isolation: isolate; }
.contact__grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 72px; }
.contact .lasa-eyebrow { color: #AFCBFF; }
.contact h2 { font-size: clamp(36px,4vw,52px); max-width: 12ch; }
.contact__copy p { color: var(--lasa-on-dark); max-width: 38ch; }
.contact__copy a { color: white; }
.contact-form { padding: 30px; border-radius: var(--lasa-radius-lg); background: white; color: var(--lasa-navy); display: grid; gap: 18px; align-content: start; }
.contact-form .lasa-btn { justify-self: start; }
.form-help, .form-state { margin: 0; color: var(--lasa-muted); font-size: 13px; }
.form-state { padding: 12px; border: 1px solid var(--lasa-border); border-radius: 8px; }
.site-footer { padding-block: 32px; background: white; }
.site-footer__inner { display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.site-footer img { width: 180px; }
.site-footer p, .site-footer a { font-size: 13px; color: var(--lasa-muted); margin: 0; }
.site-footer__links { display: flex; flex-wrap: wrap; gap: 22px; }
@media(max-width:1100px) { .hero__inner { gap: 30px; } .hero h1 { font-size: 54px; } .desktop-nav { gap: 20px; } .site-brand img { width: 220px; } .services-grid { grid-template-columns: repeat(2,1fr); } }
@media(max-width:980px) { .hero__inner { grid-template-columns: 1fr; padding-block: 48px; gap: 32px; } .hero__copy { max-width: 720px; } .hero h1 { font-size: clamp(42px,7vw,62px); } .hero__media { max-width: 700px; } .hero__media img { aspect-ratio:1100/752; } .hero::before { top:auto; bottom:0; height:42%; opacity:.6; background-size:auto 100%; background-position:right bottom; } .section-heading { align-items: flex-start; flex-direction: column; gap: 14px; } .method-grid { grid-template-columns: repeat(3,1fr); } .contact__grid { gap: 40px; grid-template-columns: 1fr 1fr; } }
@media(max-width:760px) { .desktop-nav { display: none; } .mobile-nav { display:block; } .site-header__inner { min-height: 76px; gap: 20px; } .site-brand img { width: 190px; } .project-card__body { grid-template-columns: 1fr; gap: 9px; } .contact__grid { grid-template-columns:1fr; } .contact h2 { max-width:none; } .site-footer__inner { align-items:flex-start; flex-direction:column; gap:22px; } }
@media(max-width:640px) { .site-brand img { width: 176px; } .hero__inner { padding-block: 38px; } .hero h1 { font-size: 42px; } .hero .lasa-lead { font-size: 19px; } .hero .lasa-actions { flex-direction:column; align-items:flex-start; } .hero .lasa-btn { width:100%; max-width:350px; } .project-grid { grid-template-columns:1fr; gap:34px; } .project-card__body { grid-template-columns:1fr 1.1fr; gap:16px; } .project-card__body h3 { font-size:23px; } .services-grid, .method-grid { grid-template-columns:1fr; gap:16px; } .service { padding:24px; } .method-grid { margin-top:28px; } .method-grid li { display:grid; grid-template-columns:42px 1fr; gap:12px; } .method-grid .number { margin:0; } .method-grid h3, .method-grid p { grid-column:2; } .method-grid h3 { margin:0; } .method-grid p { margin:0; } .promise { padding:22px; align-items:flex-start; } .contact-form { padding:22px; } }
@media(max-width:360px) { .hero h1 { font-size:36px; } .site-brand img { width:150px; } .project-card__body { grid-template-columns:1fr; } }

/* Focus clair sur les surfaces sombres. */
.hero :focus-visible, .contact__copy :focus-visible { outline-color: #FFFFFF; }