:root {
    --bg-color: #fcfcfc;
    --text-main: #111827;
    --text-muted: #6b7280;
    --accent-color: #000000;
    --accent-hover: #374151;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    --radius: 8px;
    --transition: 0.3s ease;
}

/* Mode sombre automatique si l'utilisateur préfère */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f1115;
        --text-main: #f9fafb;
        --text-muted: #9ca3af;
        --accent-color: #ffffff;
        --accent-hover: #d1d5db;
        --card-bg: #1a1d24;
        --border-color: #374151;
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition);
}

header {
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    background-color: var(--bg-color);
    z-index: 100;
}

nav {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.logo-text {
    font-weight: 700;
    font-size: 1.25rem;
}

.nav-link {
    font-weight: 500;
    color: var(--text-muted);
}

.nav-link:hover {
    color: var(--text-main);
}

.btn {
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius);
    font-weight: 500;
    transition: background-color var(--transition), color var(--transition);
    display: inline-block;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--bg-color);
    border: 1px solid var(--accent-color);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--text-muted);
}

main {
    flex: 1;
    max-width: 1000px;
    margin: 0 auto;
    padding: 4rem 2rem;
    width: 100%;
}

.hero {
    text-align: center;
    margin-bottom: 5rem;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.hero p {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2rem auto;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.services-preview h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    font-weight: 700;
    text-align: center;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

footer {
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    text-align: center;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.mail-btn:hover {
    color: var(--text-main);
    text-decoration: underline;
}

/* Animation simple pour les éléments "reveal" */
.reveal {
    animation: fadeIn 0.8s ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
}