/* style.css */

:root {
    /* Palette Deep Tech */
    --bg-dark: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-blue: #3b82f6;
    --accent-purple: #6366f1;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
    --font-main: 'Inter', sans-serif;
    
    /* Espacements */
    --container-width: 1200px;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }

/* Utilitaires Layout */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(to right, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--text-main);
    text-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    /* Effet de lueur en arrière-plan */
    background: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.15) 0%, transparent 50%);
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2.5rem auto;
}

/* Boutons */
.btn-primary {
    display: inline-block;
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    font-weight: 600;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

/* Section Cartes (Problem/Solution) */
.section-padding {
    padding: var(--spacing-lg) 0;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 2rem;
}

.card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 12px;
    backdrop-filter: blur(12px);
    transition: 0.4s ease;
    position: relative;
    overflow: hidden;
}

/* Effet Hover Carte */
.card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-blue);
    box-shadow: 0 10px 40px -10px rgba(59, 130, 246, 0.2);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    opacity: 0;
    transition: 0.3s;
}

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

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

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

/* Data Trust */
.data-trust {
    text-align: center;
    background: linear-gradient(90deg, rgba(15, 23, 42, 0) 0%, rgba(59, 130, 246, 0.1) 50%, rgba(15, 23, 42, 0) 100%);
    padding: 3rem 0;
    margin: 2rem 0;
}

.data-trust h2 {
    font-size: 1.8rem;
    font-weight: 300;
    letter-spacing: 1px;
}

.data-trust span {
    color: var(--accent-blue);
    font-weight: 700;
}

/* Formulaire */
.contact-section {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.form-input, .form-textarea {
    width: 100%;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    color: white;
    border-radius: 6px;
    font-family: inherit;
    transition: 0.3s;
}

.form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    background: rgba(0, 0, 0, 0.4);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
footer {
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid var(--glass-border);
    margin-top: 4rem;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Mobile */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.2rem; }
    .nav-links { display: none; } /* Pour simplifier sur mobile */
}