@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;800&display=swap');

:root {
    --primary: #0f172a;
    --primary-hover: #334155;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
}

/* Header & Navigation */
header {
    background-color: var(--card-bg);
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--accent);
}

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    margin-left: 2rem;
    font-weight: 600;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--accent);
}

/* Hero Section */
.hero {
    background: var(--primary);
    color: white;
    text-align: center;
    padding: 5rem 2rem;
    margin-bottom: 4rem;
    border-bottom: 5px solid var(--accent);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.hero p {
    font-size: 1.25rem;
    color: #cbd5e1;
    max-width: 600px;
    margin: 0 auto;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 2rem;
    color: var(--primary);
}

/* Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2.5rem;
    padding-bottom: 5rem;
}

/* Cards */
.article-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
    border: 1px solid #f1f5f9;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.1);
    border-color: #e2e8f0;
}

.article-card h2 {
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--primary);
    line-height: 1.4;
}

.article-card p {
    color: var(--text-muted);
    margin-bottom: 2rem;
    flex-grow: 1;
    font-size: 1rem;
}

.btn {
    display: inline-block;
    background: var(--accent);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    transition: background 0.2s, transform 0.1s;
}

.btn:hover { background: var(--accent-hover); }
.btn:active { transform: scale(0.98); }

/* Single Article Page */
.single-article-container {
    max-width: 800px;
    margin: 4rem auto;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.05);
    padding: 4rem;
    border: 1px solid #f1f5f9;
}

.single-article-container h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 2rem;
    color: var(--primary);
    line-height: 1.2;
    letter-spacing: -1px;
}

.article-content {
    font-size: 1.15rem;
    color: #334155;
}

.article-content h2 { font-size: 1.8rem; margin: 2.5rem 0 1rem; color: var(--primary); }
.article-content h3 { font-size: 1.4rem; margin: 2rem 0 1rem; color: var(--accent); }
.article-content p { margin-bottom: 1.5rem; line-height: 1.8; }
.article-content ul { margin-bottom: 1.5rem; padding-left: 1.5rem; }
.article-content li { margin-bottom: 0.5rem; line-height: 1.8; }
.article-content strong { color: var(--primary); font-weight: 600; }

.back-btn {
    display: inline-block;
    margin-top: 4rem;
    padding: 0.8rem 1.5rem;
    background: #f1f5f9;
    color: var(--primary);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.2s;
}
.back-btn:hover { background: #e2e8f0; }

/* Footer */
footer {
    background: var(--primary);
    color: #cbd5e1;
    text-align: center;
    padding: 3rem 2rem;
    margin-top: 5rem;
}

/* ==========================================================================
   RESPONSIVE DESIGN (Mobiles et Tablettes)
   ========================================================================== */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
        padding: 1.2rem 1rem;
    }
    
    .nav-links {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 1.5rem;
    }
    
    .nav-links a {
        margin-left: 0;
        font-size: 1rem;
    }
    
    .hero {
        padding: 3.5rem 1.5rem;
        margin-bottom: 2.5rem;
    }
    
    .hero h1 {
        font-size: 2.2rem;
        word-wrap: break-word;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .container {
        padding: 0 1rem;
    }

    .articles-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding-bottom: 3rem;
    }
    
    .article-card {
        padding: 1.5rem;
    }

    .article-card h2 {
        font-size: 1.3rem;
    }
    
    .single-article-container {
        margin: 2rem 1rem;
        padding: 1.5rem;
    }
    
    .single-article-container h1 {
        font-size: 1.8rem;
    }
    
    .article-content {
        font-size: 1.05rem;
    }

    .article-content h2 {
        font-size: 1.5rem;
        margin: 1.5rem 0 1rem;
    }
    
    .article-content h3 {
        font-size: 1.25rem;
        margin: 1.25rem 0 0.5rem;
    }
    
    .section-title {
        font-size: 1.6rem;
        text-align: center;
    }

    .back-btn {
        display: block;
        text-align: center;
        margin-top: 2rem;
    }
}