:root {
    --bg-color: #0a192f;
    --surface-color: #112240;
    --text-primary: #ccd6f6;
    --text-secondary: #8892b0;
    --accent-color: #64ffda;
    --font-main: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

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

header {
    background-color: rgba(10, 25, 47, 0.95);
    padding: 1.5rem 5%;
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--surface-color);
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
    letter-spacing: 2px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

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

main {
    flex: 1;
    padding: 3rem 5%;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-bottom: 4rem;
}

.hero h1 { font-size: 3rem; margin-bottom: 1rem; }
.hero h1 span { color: var(--accent-color); }
.hero p { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 1.5rem; }

.section-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--surface-color);
    padding-bottom: 0.5rem;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.card {
    background-color: var(--surface-color);
    padding: 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.3s, border-color 0.3s;
    border: 1px solid transparent;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}

.card-tag {
    font-size: 0.8rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
    display: block;
}

.card h3 { margin-bottom: 1rem; color: var(--text-primary); }
.card p { color: var(--text-secondary); font-size: 0.95rem; }

.article-view h1 { margin-bottom: 0.5rem; }
.article-meta { color: var(--accent-color); font-size: 0.9rem; margin-bottom: 2rem; }
.article-content { color: var(--text-secondary); line-height: 1.8; }

.back-btn {
    display: inline-block;
    margin-bottom: 2rem;
    color: var(--accent-color);
    text-decoration: none;
    cursor: pointer;
    background: none;
    border: 1px solid var(--accent-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
}

.back-btn:hover { background-color: rgba(100, 255, 218, 0.1); }

/* --- NOUVEAUX STYLES: PDF ET CODE --- */
.pdf-wrapper {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--surface-color);
}

.pdf-wrapper h3 { margin-bottom: 1rem; color: var(--text-primary); }

.pdf-wrapper iframe {
    border: 1px solid var(--surface-color);
    border-radius: 8px;
    background-color: #fff;
    margin-bottom: 1rem;
}

.download-btn {
    display: inline-block;
    color: var(--bg-color);
    background-color: var(--accent-color);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-weight: bold;
    font-size: 0.9rem;
    transition: opacity 0.3s;
}

.download-btn:hover { opacity: 0.8; }

.code-wrapper {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--surface-color);
}

.code-wrapper h3 { margin-bottom: 1rem; color: var(--text-primary); }

pre {
    background-color: #020c1b;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    border: 1px solid var(--surface-color);
}

code {
    font-family: 'Courier New', Courier, monospace;
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.5;
}

footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--surface-color);
    color: var(--text-secondary);
}

footer a {
    color: var(--accent-color);
    text-decoration: none;
    margin: 0 0.5rem;
}