:root {
    --fog: #f4f5f7;
    --fog-muted: #eceef2;
    --white: #ffffff;
    --anthracite: #2c3038;
    --dark-blue: #1b2a4a;
    --deep-blue: #0d1b2a;
    --text: #2c3038;
    --text-muted: #5c6370;
    --header-h: 4rem;
    --space: 1.25rem;
    --radius: 0.75rem;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

section[id] {
    scroll-margin-top: var(--header-h);
}

body {
    margin: 0;
    font-family: "Source Sans 3", system-ui, sans-serif;
    font-size: 1.0625rem;
    line-height: 1.6;
    color: var(--text);
    background: var(--fog);
}

img,
svg {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
}

h1,
h2,
h3 {
    line-height: 1.2;
    color: var(--deep-blue);
    font-weight: 700;
}

h1 {
    margin: 0 0 0.75rem;
    font-size: clamp(1.85rem, 6vw, 3rem);
    letter-spacing: -0.02em;
}

h2 {
    margin: 0 0 0.5rem;
    font-size: clamp(1.5rem, 4vw, 2rem);
}

h3 {
    margin: 0 0 0.4rem;
    font-size: 1.125rem;
}

p {
    margin: 0 0 1rem;
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.container {
    width: min(1080px, calc(100% - 2rem));
    margin-inline: auto;
}

.site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 100;
    background: var(--dark-blue);
    box-shadow: 0 1px 0 rgba(13, 27, 42, 0.25);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: min(1080px, calc(100% - 2rem));
    margin-inline: auto;
    min-height: var(--header-h);
}

.nav__brand {
    text-decoration: none;
    color: var(--white);
    font-weight: 700;
    letter-spacing: 0.02em;
}

.nav__link {
    text-decoration: none;
    color: var(--white);
    font-weight: 500;
    padding: 0.35rem 0;
    border-bottom: 1px solid transparent;
    transition: opacity 0.2s ease, border-color 0.2s ease;
}

.nav__brand:hover,
.nav__link:hover,
.nav__brand:focus-visible,
.nav__link:focus-visible {
    opacity: 0.82;
}

.nav__link:hover,
.nav__link:focus-visible {
    border-bottom-color: rgba(255, 255, 255, 0.45);
}

.hero {
    padding: calc(var(--header-h) + 4.5rem) 0 4.5rem;
    background: var(--fog);
}

.hero__inner {
    max-width: 40rem;
}

.eyebrow {
    margin: 0 0 0.75rem;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--dark-blue);
}

.hero__lead {
    margin-bottom: 1.75rem;
    font-size: 1.15rem;
    color: var(--text-muted);
}

.btn {
    display: inline-block;
    padding: 0.85rem 1.4rem;
    background: var(--dark-blue);
    color: var(--white);
    text-decoration: none;
    font: inherit;
    font-weight: 600;
    border: 0;
    border-radius: 0.4rem;
    cursor: pointer;
    transition: background 0.2s ease, opacity 0.2s ease;
}

.btn:hover,
.btn:focus-visible {
    background: var(--deep-blue);
}

.pourquoi,
.services,
.contact {
    padding: 4.5rem 0;
}

.section-intro {
    margin-bottom: 2.25rem;
    max-width: 36rem;
    color: var(--text-muted);
}

.cards {
    display: grid;
    gap: 1.25rem;
}

.card {
    padding: 1.5rem;
    background: var(--white);
    border: 1px solid var(--fog-muted);
    border-radius: var(--radius);
}

.card p {
    margin-bottom: 0;
    color: var(--text-muted);
}

.icon {
    display: grid;
    place-items: center;
    width: 3rem;
    height: 3rem;
    margin-bottom: 1rem;
    color: var(--dark-blue);
}

.icon svg {
    width: 2.5rem;
    height: 2.5rem;
}

.icon--sm {
    width: 2.25rem;
    height: 2.25rem;
    margin: 0;
    flex-shrink: 0;
}

.icon--sm svg {
    width: 1.75rem;
    height: 1.75rem;
}

.services {
    background: var(--fog-muted);
}

.services__list {
    display: grid;
    gap: 1rem;
}

.services__list li {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    padding: 1.15rem 1.25rem;
    background: var(--white);
    border-radius: var(--radius);
}

.services__list p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.98rem;
}

.contact {
    background: var(--fog);
}

.contact__details {
    font-style: normal;
}

.contact__details a {
    color: var(--dark-blue);
    text-decoration: none;
    border-bottom: 1px solid transparent;
}

.contact__details a:hover,
.contact__details a:focus-visible {
    border-bottom-color: var(--dark-blue);
}

.nav__link[aria-current="page"] {
    border-bottom-color: rgba(255, 255, 255, 0.55);
}

.page-intro {
    padding: calc(var(--header-h) + 3.5rem) 0 1.5rem;
    background: var(--fog);
}

.form-section {
    padding: 0 0 4.5rem;
    background: var(--fog);
}

.contact-form {
    max-width: 40rem;
    padding: 1.5rem;
    background: var(--white);
    border: 1px solid var(--fog-muted);
    border-radius: var(--radius);
}

.form-grid {
    display: grid;
    gap: 1.15rem;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-bottom: 1.15rem;
}

.form-grid .field {
    margin-bottom: 0;
}

.field label {
    font-weight: 600;
    color: var(--anthracite);
    font-size: 0.95rem;
}

.field input,
.field textarea {
    width: 100%;
    padding: 0.7rem 0.8rem;
    font: inherit;
    color: var(--text);
    background: var(--fog);
    border: 1px solid #d5d8de;
    border-radius: 0.4rem;
}

.field input:focus,
.field textarea:focus {
    outline: 2px solid var(--dark-blue);
    outline-offset: 1px;
    border-color: var(--dark-blue);
    background: var(--white);
}

.field textarea {
    resize: vertical;
    min-height: 8rem;
}

.field--check {
    flex-direction: row;
    align-items: flex-start;
    gap: 0.65rem;
}

.field--check input {
    width: 1.1rem;
    height: 1.1rem;
    margin-top: 0.2rem;
    accent-color: var(--dark-blue);
    flex-shrink: 0;
}

.field--check label {
    font-weight: 500;
}

.site-footer {
    padding: 2.25rem 0;
    background: var(--anthracite);
    color: var(--white);
    font-size: 0.95rem;
}

.site-footer p {
    margin: 0 0 0.4rem;
}

.footer__mentions {
    margin: 0;
    opacity: 0.72;
    font-size: 0.85rem;
}

@media (min-width: 720px) {
    .cards {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }

    .services__list {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.25rem;
    }

    .hero {
        padding: calc(var(--header-h) + 6rem) 0 6rem;
    }

    .pourquoi,
    .services,
    .contact {
        padding: 5.5rem 0;
    }

    .page-intro {
        padding: calc(var(--header-h) + 4.5rem) 0 2rem;
    }

    .form-section {
        padding: 0 0 5.5rem;
    }

    .contact-form {
        padding: 2rem;
    }

    .form-grid {
        grid-template-columns: 1fr 1fr;
        gap: 1.25rem 1.15rem;
    }
}