/* style.css – Thème clair, bilingue, avec QR code & toggle langue */

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

:root {
    --bg: #f7f9fc;
    --bg-soft: #ffffff;
    --card-bg: rgba(255, 255, 255, 0.9);
    --border-subtle: rgba(0, 0, 0, 0.08);

    --accent: #21b6a8;
    --accent-soft: rgba(33, 182, 168, 0.12);

    --text-main: #1f2a37;
    --text-strong: #0f172a;
    --text-muted: #4b5563;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text-main);
    line-height: 1.6;
}

/* gestion bilingue */
.lang-fr,
.lang-en {
    display: block;
}

body.lang-fr .lang-en {
    display: none;
}

body.lang-en .lang-fr {
    display: none;
}

/* NAVIGATION HAUTE */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 54px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 7vw;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    z-index: 20;
    border-bottom: 1px solid var(--border-subtle);
}

.logo {
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* toggle langue */
.lang-toggle {
    border-radius: 999px;
    border: 1px solid var(--border-subtle);
    background: var(--bg-soft);
    padding: 3px;
    display: flex;
    align-items: center;
    gap: 2px;
    cursor: pointer;
    font-size: 0.75rem;
}

.lang-toggle span {
    padding: 4px 8px;
    border-radius: 999px;
    min-width: 28px;
    text-align: center;
}

body.lang-fr .lang-toggle span[data-lang="fr"],
body.lang-en .lang-toggle span[data-lang="en"] {
    background: var(--accent);
    color: #ffffff;
}

body.lang-fr .lang-toggle span[data-lang="en"],
body.lang-en .lang-toggle span[data-lang="fr"] {
    background: transparent;
    color: var(--text-muted);
}

/* SLIDES */
.slide {
    min-height: 100vh;
    padding: 90px 10vw 64px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    scroll-margin-top: 72px;
    background: var(--bg);
}

h1, h2 {
    margin-bottom: 24px;
}

h1 {
    font-size: clamp(2.4rem, 4vw, 3.2rem);
    color: var(--text-strong);
}

h2 {
    font-size: clamp(1.9rem, 3vw, 2.3rem);
    color: var(--text-strong);
}

p {
    font-size: 1.05rem;
    margin-bottom: 12px;
    max-width: 880px;
}

strong {
    color: var(--text-strong);
}

.tag {
    display: inline-block;
    border-radius: 999px;
    padding: 4px 12px;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    border: 1px solid var(--accent);
    margin-bottom: 18px;
    color: var(--accent);
    background: var(--accent-soft);
}

/* intro + QR */
.intro-layout {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    align-items: flex-start;
}

.intro-main {
    flex: 1 1 320px;
}

.intro-qr {
    flex: 0 0 220px;
    display: flex;
    justify-content: center;
}

.qr-card {
    background: var(--bg-soft);
    border-radius: 16px;
    border: 1px solid var(--border-subtle);
    padding: 10px 14px 12px;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.05);
    text-align: center;
}

.qr-card img {
    max-width: 170px;
    height: auto;
    display: block;
    margin: 0 auto 8px;
}

.qr-caption {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* GRILLES & CARTES */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    margin-top: 18px;
}

.card {
    border-radius: 16px;
    border: 1px solid var(--border-subtle);
    padding: 16px 18px 18px;
    background: var(--bg-soft);
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.05);
    transition: box-shadow 0.2s ease-out, transform 0.15s ease-out;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.card h3 {
    margin-bottom: 8px;
    font-size: 1.25rem;
    color: var(--text-strong);
}

.label {
    font-size: 0.78rem;
    text-transform: uppercase;
    opacity: 0.8;
    margin-bottom: 6px;
    color: var(--accent);
}

ul {
    margin-left: 18px;
    margin-bottom: 6px;
    font-size: 0.98rem;
    color: var(--text-main);
}

li {
    margin-bottom: 4px;
}

.footer-note {
    margin-top: 20px;
    font-size: 0.92rem;
    color: var(--text-muted);
}

/* schéma architecture */
.arch-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}

.arch-node {
    text-align: center;
    padding: 8px 12px;
}

.arch-pill {
    border-radius: 999px;
    border: 1px solid var(--border-subtle);
    background: var(--bg-soft);
}

.arch-main {
    border-radius: 14px;
    border: 1px solid var(--accent);
    background: var(--accent-soft);
}

.arch-sub {
    display: block;
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.arch-arrow {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.arch-arrow-up {
    margin-top: 2px;
}

.arch-systems {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.arch-system {
    padding: 6px 10px;
    border-radius: 999px;
    border: 1px solid var(--border-subtle);
    background: var(--bg-soft);
    font-size: 0.9rem;
}

/* BOUTON "SECTION SUIVANTE" */
.next-btn {
    position: fixed;
    right: 3vw;
    bottom: 3vh;
    padding: 10px 18px;
    border-radius: 999px;
    border: 1px solid var(--accent);
    background: var(--accent);
    color: white;
    font-size: 0.9rem;
    cursor: pointer;
    z-index: 30;
    display: flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 10px 22px rgba(0, 0, 0, 0.08);
    transition: transform 0.15s ease-out, box-shadow 0.15s ease-out;
}

.next-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 28px rgba(0, 0, 0, 0.15);
}

.next-btn:active {
    transform: translateY(0);
}

@media (max-width: 768px) {
    .top-nav {
        padding: 0 4vw;
    }
    .slide {
        padding: 72px 6vw 56px;
    }
    .nav-hint {
        display: none;
    }
    .intro-layout {
        flex-direction: column;
    }
    .intro-qr {
        justify-content: flex-start;
    }
}