:root {
    --primary-color: #005A9C; /* Bleu France */
    --secondary-color: #E1000F; /* Rouge Vif pour l'action */
    --accent-color: #4CAF50; /* Vert pour la validation */
    --dark-color: #222222;
    --light-color: #FFFFFF;
    --gray-color: #f4f4f4;
    --text-color: #333333;
    --font-family: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-color);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: var(--light-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    color: var(--dark-color);
    text-decoration: none;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: var(--primary-color);
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 5rem 0;
}

.hero h1 {
    font-size: 3rem;
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.hero .subtitle {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 2rem auto;
    color: #555;
}

.hero-actions .btn {
    margin: 0 0.5rem;
}

.btn-primary-large {
    background-color: var(--secondary-color);
    color: var(--light-color);
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border-radius: 8px;
}

.btn-secondary-large {
     background-color: var(--light-color);
    color: var(--dark-color);
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border: 2px solid var(--dark-color);
    border-radius: 8px;
}

/* Services Section */
.services-section, .faq-section {
    padding: 4rem 0;
}

.services-section h2, .pricing-section h2, .faq-section h2, .contact-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.services-section p, .pricing-section p {
     text-align: center;
     margin-bottom: 3rem;
     color: #555;
}

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

.service-card {
    background: var(--light-color);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    text-align: center;
}

.service-card .problem {
    font-style: italic;
    color: #666;
    margin-bottom: 1.5rem;
    text-align: left;
    border-left: 3px solid var(--primary-color);
    padding-left: 1rem;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.service-card .features {
    list-style: none;
    text-align: left;
}

.service-card .features li {
    margin-bottom: 0.5rem;
}

/* Pricing Section */
.pricing-section {
    background-color: var(--gray-color);
    padding: 4rem 0;
}

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

.pricing-card {
    background: var(--light-color);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    text-align: center;
}

.pricing-card.featured {
    transform: scale(1.05);
    border: 2px solid var(--primary-color);
}

.pricing-card h3 {
    font-size: 1.5rem;
}

.pricing-card .price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 1rem 0;
}

.pricing-card .price span {
    font-size: 1rem;
    font-weight: 400;
    color: #777;
}

.pricing-card ul {
    list-style: none;
    margin: 2rem 0;
}
.pricing-card ul li {
    margin-bottom: 0.75rem;
}

/* FAQ Section */
.faq-item {
    border-bottom: 1px solid #ddd;
    padding: 1rem 0;
}
.faq-question {
    width: 100%;
    background: none;
    border: none;
    text-align: left;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-icon {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}
.faq-answer p {
    padding: 1rem 0;
}

/* Contact Section */
.contact-section {
    background: var(--primary-color);
    color: var(--light-color);
    padding: 4rem 0;
    text-align: center;
}

.contact-section h2 {
    font-size: 2.5rem;
}

.contact-section p {
    margin-bottom: 2rem;
}

.contact-form {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.contact-form input {
    padding: 1rem;
    border-radius: 5px;
    border: 1px solid #ddd;
    flex: 1 1 200px;
}

.contact-form button {
     flex-basis: 100%;
}


/* Footer */
footer {
    background: var(--dark-color);
    color: #ccc;
    text-align: center;
    padding: 2rem 0;
}

footer p {
    margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    nav ul {
        display: none; /* Simplification, pour une vraie app utiliser JS pour un menu burger */
    }
    .hero h1 {
        font-size: 2.5rem;
    }
}