:root {
    --bg-primary: #fdfdfd;
    --bg-secondary: #f4f6f9;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --accent-cyan: #14b8a6; /* Un cyan océanique / turquoise très serein */
    --accent-gold: #fbbf24;
    --accent-magenta: #e11d48; /* Magenta franc mais pas lourd */
    --highlight-secondary: #e11d48; 
    --glass-bg: rgba(253, 253, 253, 0.85);
    --glass-border: rgba(0, 0, 0, 0.04);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.8;
}

#bg-canvas, #friction-canvas, #river-canvas, #antenna-canvas {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0;
}
#bg-canvas { position: fixed; opacity: 0.6; }

.glass-nav {
    position: fixed; top: 0; width: 100%; z-index: 1000;
    background: var(--glass-bg); backdrop-filter: blur(15px); -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-content {
    display: flex; justify-content: space-between; align-items: center;
    max-width: 1200px; margin: 0 auto; padding: 1rem 2rem;
}

.logo { font-size: 1.1rem; font-weight: 300; letter-spacing: 3px; color: var(--accent-cyan); text-transform: uppercase;}

.nav-links { list-style: none; display: flex; gap: 2rem; }
.nav-links a {
    color: var(--text-secondary); text-decoration: none; font-size: 0.75rem; font-weight: 600;
    letter-spacing: 2px; transition: color 0.3s ease; text-transform: uppercase;
}
.nav-links a:hover { color: var(--accent-magenta); }

.hero {
    height: 100vh; display: flex; align-items: center; justify-content: center;
    position: relative; z-index: 10; text-align: center; overflow: hidden;
}

.hero-content { max-width: 900px; padding: 2rem; position: relative; z-index: 2; }
.hero h1 { font-size: clamp(2.5rem, 6vw, 4.2rem); font-weight: 200; line-height: 1.2; margin-bottom: 1.5rem; letter-spacing: 2px; text-transform: uppercase; }
.highlight { color: transparent; background: linear-gradient(90deg, var(--accent-magenta), var(--accent-gold)); -webkit-background-clip: text; background-clip: text; font-weight: 400; }
.subtitle { font-size: 1.1rem; color: var(--accent-cyan); font-weight: 300; letter-spacing: 2px; text-transform: uppercase; }

main { position: relative; z-index: 10; background: var(--bg-primary); }
.content-section {
    display: flex; align-items: center; justify-content: space-between; gap: 4rem;
    min-height: 80vh; padding: 6rem 10%; position: relative; overflow: hidden; border-bottom: 1px solid var(--glass-border);
}
.alt-bg { background: var(--bg-secondary); }

.text-content {
    flex: 1; max-width: 600px; z-index: 2;
    padding: 3rem; background: rgba(255, 255, 255, 0.4); backdrop-filter: blur(15px);
    border-radius: 32px; border: 1px solid var(--glass-border);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.02);
}
.text-content.centered { margin: 0 auto; text-align: center; background: none; border: none; backdrop-filter: none; box-shadow: none;}
.text-content.full-width { max-width: 900px; margin: 0 auto; }

.text-content h2 { font-size: 2rem; font-weight: 200; margin-bottom: 1.5rem; color: var(--text-primary); letter-spacing: 2px; text-transform: uppercase;}
.text-content p { font-size: 1.05rem; color: var(--text-secondary); margin-bottom: 1.5rem; font-weight: 300; }
.text-content p:last-child { margin-bottom: 0; }

.canvas-container {
    flex: 1; height: 500px; position: relative;
    display: flex; justify-content: center; align-items: center;
}

/* IA Details styling */
.ia-details {
    background: rgba(20, 184, 166, 0.05); border: 1px solid rgba(20, 184, 166, 0.15);
    border-radius: 20px; margin-top: 2rem; overflow: hidden;
}
.ia-details summary {
    padding: 1.5rem; cursor: pointer; font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem; color: var(--accent-cyan); letter-spacing: 1px; user-select: none;
    background: rgba(255, 255, 255, 0.6); transition: background 0.3s; font-weight: 600;
}
.ia-details summary:hover { background: rgba(20, 184, 166, 0.1); }
.ia-content { padding: 2rem; font-family: 'Outfit', sans-serif; background: #fff;}
.ia-content h4 { color: var(--accent-magenta); margin-top: 2rem; margin-bottom: 0.5rem; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; font-size: 0.85rem;}
.ia-content h4:first-child { margin-top: 0; }
.ia-content p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.8;}

footer {
    background: var(--bg-secondary); padding: 5rem 10% 2rem 10%; text-align: center; border-top: 1px solid var(--glass-border);
}
.brand h3 { font-weight: 300; letter-spacing: 3px; color: var(--text-primary); margin-bottom: 0.5rem; text-transform: uppercase;}
.brand p { color: var(--text-secondary); font-size: 0.9rem; opacity: 0.6;}
.footer-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem; margin: 3rem 0; }
.footer-link { color: var(--text-secondary); text-decoration: none; font-size: 0.75rem; text-transform: uppercase; transition: color 0.3s; letter-spacing: 1px; font-weight: 600; opacity: 0.6;}
.footer-link:hover, .footer-link.active { color: var(--accent-magenta); opacity: 1; }
.copyright { color: #a0aec0; font-size: 0.75rem; margin-top: 2rem; letter-spacing: 2px;}

/* Animations */
.fade-in { animation: fadeIn 2s cubic-bezier(0.4, 0, 0.2, 1) forwards; opacity: 0; transform: translateY(20px); }
.delay-1 { animation-delay: 0.5s; }
@keyframes fadeIn { to { opacity: 1; transform: translateY(0); } }

@media (max-width: 900px) {
    .content-section { flex-direction: column; padding: 4rem 5%; gap: 2rem;}
    .order-mobile { order: -1; }
    .order-desktop { order: 0; }
    .nav-links { display: none; }
    .text-content { padding: 2rem; box-shadow: none; border-radius: 20px;}
    .canvas-container { height: 300px; width: 100%;}
}

/* -------------------------------------------
   RESPONSIVE TEXT & OVERFLOW FIXES (Mobile)
   ------------------------------------------- */
body {
    word-break: break-word;
    overflow-wrap: break-word;
    -webkit-hyphens: auto;
    hyphens: auto;
}
.math-display, .math-box, .ia-content, pre, code {
    overflow-x: auto;
    overflow-y: hidden;
    max-width: 100%;
}
@media (max-width: 768px) {
    .glass-panel {
        padding: 1.5rem !important;
    }
    .ia-details {
        padding: 1rem 1.2rem !important;
    }
    .hero h1 {
        font-size: 2.2rem !important;
    }
    .section {
        padding: 4rem 0 !important;
    }
    .container {
        padding: 0 1rem !important;
    }
}