:root {
    /* Animation */
    --duration: 0.4s;
    --ease: cubic-bezier(0.16, 1, 0.3, 1);

    /* Palette claire fixe */
    --bg: #f9f9fb;
    --bg-2: #ffffff;
    --surface: #ffffff;
    --surface-h: #f5f5f7;
    --border: #e2e2e7;
    --text: #0f0f0f;
    --text-2: #2d2d2d;
    --text-dim: #6b7280;
    --brand-color: #2563eb;
    --brand-color-glow: #3b82f6;
    --brand-color-soft: rgba(37, 99, 235, 0.08);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: "Instrument Sans", system-ui, sans-serif;
    line-height: 1.5;
    min-height: 100dvh;

    background-image:
        radial-gradient(circle at 8% 92%, var(--brand-color-soft) 0%, transparent 50%),
        radial-gradient(circle at 92% 12%, var(--brand-color-soft) 0%, transparent 50%);
    background-attachment: fixed;
}

/* ── Header ── */
/* ── Header wrapper ── */
header {
    position: fixed;
    inset-block-start: 1.2rem;
    inline-size: 100%;
    z-index: 1000;
    /* important */
}


.top-bar {
    pointer-events: auto;

    display: flex;
    align-items: center;
    gap: 2.4rem;

    max-width: fit-content;
    margin-inline: auto;
    padding: 0.9rem 1.6rem;

    background: rgba(255, 255, 255, 0.78);
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    backdrop-filter: saturate(180%) blur(16px);

    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 999px;

    box-shadow:
        0 10px 30px -12px rgba(0, 0, 0, 0.18);

    transition: all 0.35s var(--ease);
}


/* ── Logo image ───────────────────────── */
.logo {
    display: flex;
    align-items: center;
}

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    height: 50px;
    /* taille desktop */
    width: auto;
    display: block;
    object-fit: contain;
    transition: transform 0.25s var(--ease), opacity 0.25s ease;
}

.logo a:hover img {
    transform: scale(1.04);
    opacity: 0.95;
}


@keyframes shine {
    to {
        background-position: -200% center;
    }
}

/* ── Navigation ── */
.main-nav {
    display: flex;
    gap: 1.8rem;
    align-items: center;
}


.main-nav a {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-dim);
    text-decoration: none;
    position: relative;
    transition: color 0.2s ease;
}

.main-nav a::after {
    content: "";
    position: absolute;
    inset-inline: 0;
    inset-block-end: -5px;
    height: 2px;
    background: var(--brand-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s ease;
}

.main-nav a:hover,
.main-nav a:focus-visible {
    color: var(--text);
}

.main-nav a:hover::after,
.main-nav a:focus-visible::after {
    transform: scaleX(1);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.1rem;
}

.btn-header {
    padding: 0.55rem 1.5rem;
    border-radius: 999px;
    background: var(--surface);
    border: 1px solid var(--border);
    font-size: 0.96rem;
    font-weight: 500;
    color: var(--text);
    text-decoration: none;
    transition: all 0.2s ease;
}

.btn-header:hover {
    background: var(--surface-h);
    border-color: var(--brand-color);
}

.burger {
    display: none;
    background: none;
    border: none;
    font-size: 1.9rem;
    color: var(--text);
    cursor: pointer;
}

/* ── Hero ── */
main {
    padding-block-start: 18vh;
    min-block-size: 90vh;
    display: grid;
    place-items: center;
}

.hero-title {
    font-family: "Space Grotesk", sans-serif;
    font-size: clamp(4.4rem, 10vw, 12rem);
    font-weight: 800;
    line-height: 0.88;
    letter-spacing: -4px;
    margin-block-end: 1.6rem;
    background: linear-gradient(to bottom right, var(--text) 20%, var(--text-dim) 80%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-subtitle {
    max-width: 680px;
    font-size: clamp(1.4rem, 3.2vw, 1.8rem);
    color: var(--text-dim);
    margin-block-end: 3.5rem;
    text-align: center;
    line-height: 1.45;
    margin-inline: auto;
}

/* Bouton principal */
.btn-force {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1.2rem 2.8rem;
    border-radius: 999px;
    background: var(--brand-color);
    color: white;
    font-weight: 600;
    font-size: 1.18rem;
    text-decoration: none;
    transition: all 0.28s var(--ease);
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn-force:hover,
.btn-force:focus-visible {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px -16px var(--brand-color-glow);
    background: var(--brand-color-glow);
}

/* ── Cards ── */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: clamp(2rem, 4vw, 3rem);
    max-width: 1440px;
    margin-inline: auto;
    padding: 8rem 5vw 10rem;
}

.card {
    position: relative;
    padding: 3.2rem 3rem 3.6rem;
    background: linear-gradient(180deg,
            rgba(255, 255, 255, 0.85),
            rgba(255, 255, 255, 0.65));

    border-radius: 24px;
    border: 1px solid var(--border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);

    transition: all 0.45s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
}


.card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(600px circle at var(--x, 50%) var(--y, 50%),
            rgba(37, 99, 235, 0.08),
            transparent 40%);
    opacity: 0;
    transition: opacity 0.45s ease;
}

.card:hover::before {
    opacity: 1;
}

.card:hover {
    transform: translateY(-14px);
    border-color: rgba(37, 99, 235, 0.35);
    box-shadow: 0 30px 60px -24px rgba(0, 0, 0, 0.22);
}


.card-index {
    position: absolute;
    inset-block-start: 2.2rem;
    inset-inline-end: 2.4rem;

    font-family: "Space Grotesk", sans-serif;
    font-size: 4.2rem;
    font-weight: 700;
    letter-spacing: -2px;

    color: transparent;
    background: linear-gradient(180deg,
            var(--accent),
            rgba(0, 0, 0, 0));
    -webkit-background-clip: text;
    background-clip: text;

    opacity: 0.22;
    pointer-events: none;
}


.card h3 {
    font-family: "Space Grotesk", sans-serif;
    font-size: 2.2rem;
    line-height: 1.05;
    font-weight: 700;
    margin-bottom: 1.6rem;
    letter-spacing: -1.2px;
}

.card p {
    font-size: 1.06rem;
    color: var(--text-dim);
    line-height: 1.65;
    max-width: 440px;
}


/* ── Final CTA ── */
.final-cta {
    text-align: center;
    padding-block: 18vh 24vh;
}

.section-title {
    font-size: clamp(3.4rem, 7vw, 6.2rem);
    font-weight: 700;
    line-height: 0.9;
    margin-block-end: 2.5rem;
    background: linear-gradient(90deg, transparent, var(--text) 50%, transparent);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    opacity: 0.94;
}

/* Variante HERO – plus marquante */
.section-title.hero {
    font-size: clamp(5.2rem, 12vw, 10rem);
    line-height: 0.88;
    margin-bottom: 3rem;
}


.final-text {
    font-size: 1.62rem;
    color: var(--text-dim);
    max-width: 720px;
    margin: 0 auto 3.5rem;
    line-height: 1.5;
}

/* ── Footer ── */
footer {
    text-align: center;
    padding-block: 6rem 8rem;
    border-block-start: 1px solid var(--border);
}

footer p {
    font-size: 1.05rem;
    color: var(--text-dim);
    margin-block-end: 1.4rem;
}

.footer-links a {
    color: var(--text-dim);
    text-decoration: none;
    margin: 0 1.3rem;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--brand-color);
}

/* ── Responsive ── */
@media (max-width: 980px) {
    .main-nav {
        position: fixed;
        inset: 0;
        background: var(--bg);

        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 3rem;

        opacity: 0;
        pointer-events: none;
        transform: translateY(-20px);

        transition: all 0.4s var(--ease);
        z-index: 999;
    }

    .main-nav.open {
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
    }

    .main-nav a {
        font-size: clamp(2rem, 7vw, 2.8rem);
        font-weight: 600;
        color: var(--text);
    }

    .burger {
        display: block;
        z-index: 1001;
    }

    .header-actions {
        display: none;
    }

    main {
        padding-block-start: 24vh;
    }

    header {
        inset-block-start: 0.8rem;
    }

    .top-bar {
        padding: 0.7rem 1.2rem;
    }
}

/* ── Animations d’apparition ── */
.reveal {
    opacity: 0;
    transform: translateY(32px);
    transition:
        opacity 0.8s var(--ease),
        transform 0.8s var(--ease);
    will-change: transform, opacity;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Décalage progressif */
.reveal.delay-1 {
    transition-delay: 0.12s;
}

.reveal.delay-2 {
    transition-delay: 0.24s;
}

.reveal.delay-3 {
    transition-delay: 0.36s;
}

.reveal.delay-4 {
    transition-delay: 0.48s;
}

/* ── Section partenaires ── */
.partners {
    padding: 10rem 5vw 8rem;
    max-width: 1440px;
    margin: 0 auto;
    text-align: center;
}

.partners-title {
    font-size: clamp(2.6rem, 6vw, 4.2rem);
    font-weight: 700;
    margin-bottom: 1.4rem;
    letter-spacing: -1.4px;
}

.partners-subtitle {
    color: var(--text-dim);
    font-size: 1.25rem;
    max-width: 640px;
    margin: 0 auto 5rem;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 3.2rem;
    align-items: center;
}

.partner {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 90px;
    padding: 1.2rem;
    border-radius: 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    transition: all 0.35s var(--ease);
}

.partner img {
    max-height: 88px;
    max-width: 140px;
    object-fit: contain;
    filter: grayscale(100%) contrast(0.85);
    opacity: 0.7;
    transition: all 0.35s ease;
}

.partner:hover {
    transform: translateY(-6px);
    border-color: rgba(225, 29, 72, 0.35);
    box-shadow: 0 18px 40px -14px rgba(0, 0, 0, 0.12);
}

.partner:hover img {
    filter: none;
    opacity: 1;
}


@media (max-width: 580px) {
    .hero-title {
        font-size: clamp(3.6rem, 12vw, 5.8rem);
    }

    .cards {
        grid-template-columns: 1fr;
        padding-inline: 6vw;
    }
}

/* ── Impact cards ───────────────────────── */
.impact-cards {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.impact-card {
    text-align: left;
    padding: 2.8rem 2.6rem 3rem;
}

/* Chiffre principal */
.impact-value {
    display: block;
    font-family: "Space Grotesk", sans-serif;
    font-size: clamp(3.2rem, 6vw, 4.2rem);
    font-weight: 700;
    letter-spacing: -2px;
    line-height: 1;
    margin-bottom: 0.8rem;

    color: transparent;
    background: linear-gradient(180deg,
            var(--brand-color),
            var(--brand-color-glow));
    -webkit-background-clip: text;
    background-clip: text;
}

/* Label */
.impact-label {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text);
    margin-bottom: 1.2rem;
}

/* Description */
.impact-desc {
    font-size: 1.02rem;
    color: var(--text-dim);
    line-height: 1.6;
    max-width: 320px;
}

@media (max-width: 980px) {
    .logo img {
        height: 30px;
    }
}