/* --- 1. VARIABLES ET FONDATIONS --- */
        :root {
            --copper: #c5a059;
            --copper-low: rgba(197, 160, 89, 0.15);
            --copper-mid: rgba(197, 160, 89, 0.4);
            --bg-dark: #0a0a0a;
        }

        body {
            background-color: var(--bg-dark);
            color: var(--copper);
            font-family: 'Inter', sans-serif;
            margin: 0;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            overflow-x: hidden;
            transition: background-color 0.6s ease;
        }
        
        a {
            text-decoration: none;
            color: inherit;
        }

        .serif { font-family: 'Playfair Display', serif; }
        .uppercase { text-transform: uppercase; }

                /* --- Bouton Plein Écran --- */
        .fullscreen-btn {
            position: fixed;
            top: 2rem;
            right: 2rem;
            z-index: 500;
            background: transparent;
            border: 1px solid var(--copper-low);
            padding: 0.8rem;
            cursor: pointer;
            transition: all 0.4s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            backdrop-filter: blur(5px);
            border-radius: 50%;
        }

        .fullscreen-btn:hover {
            border-color: var(--copper-mid);
            background: rgba(197, 160, 89, 0.05);
            transform: scale(1.05);
        }

        .fullscreen-btn svg {
            width: 18px;
            height: 18px;
            fill: var(--copper);
            opacity: 0.6;
            transition: opacity 0.3s ease;
        }

        .fullscreen-btn:hover svg {
            opacity: 1;
        }

        /* --- 2. STRUCTURE PRINCIPALE (LAYOUT) --- */
        main {
            flex-grow: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 2rem 0;
        }

        .contact-container {
            max-width: 700px;
            width: 100%;
            margin: 0 auto;
            padding: 2rem;
            position: relative;
            box-sizing: border-box; /* Pour que le padding n'élargisse pas la boîte */
        }

        /* --- 3. EFFET D'ÉCLIPSE (FOCUS) --- */
        .content-to-dim {
            transition: opacity 0.6s cubic-bezier(0.23, 1, 0.32, 1), filter 0.6s ease;
            will-change: opacity, filter;
        }

        /* Lorsque l'on survole une info-bulle, le reste s'assombrit */
        body:has(.tooltip-container:hover) .content-to-dim {
            opacity: 0.15;
            filter: blur(1px);
        }

        /* --- 4. TYPOGRAPHIE ET TITRES --- */
        .header-section {
            text-align: center;
            margin-bottom: 1.5rem;
            padding: 0 1rem;
        }

        .page-title {
            font-size: 2.25rem; /* ~text-4xl */
            letter-spacing: 0.2em; /* ~tracking-widest */
            text-transform: uppercase;
            margin-bottom: 1rem;
            font-weight: normal;
            margin-top: 0px;
            text-align: center;
        }

        @media (min-width: 768px) {
            .page-title { font-size: 3.75rem; } /* ~text-6xl */
        }

        .divider {
            width: 6rem; /* w-24 */
            height: 1px;
            background-color: currentColor;
            margin: 0 auto;
            opacity: 0.3;
        }

        .intro-text {
            text-align: center;
            font-size: 0.875rem; /* text-sm */
            letter-spacing: 0.3em;
            text-transform: uppercase;
            line-height: 1.625;
            margin-bottom: 1rem;
            padding: 0 1rem;
        }

        .sub-text {
            text-align: center;
            font-size: 0.75rem; /* text-xs */
            letter-spacing: 0.3em;
            text-transform: uppercase;
            opacity: 0.8;
            line-height: 1.625;
            margin-bottom: 4rem;
            padding: 0 1rem;
        }

        .back-link-container {
            text-align: center;
            margin-top: 4rem;
        }

        .back-link {
            text-decoration: none;
            color: var(--copper);
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 0.3em;
            opacity: 0.4;
            transition: opacity 0.3s;
        }

        .back-link:hover { opacity: 1; }

        /* --- 5. INFO-BULLES (TOOLTIPS) --- */
        .tooltip-container {
            position: relative;
            display: inline-block;
            cursor: help;
            border-bottom: 1px dotted var(--copper-mid);
            color: #ffffff;
            z-index: 100;
        }

        .tooltip-content {
            visibility: hidden;
            width: 260px;
            background-color: #111;
            color: var(--copper);
            text-align: center;
            border: 1px solid var(--copper);
            padding: 1.5rem;
            position: absolute;
            z-index: 110;
            bottom: 150%;
            left: 50%;
            margin-left: -130px; /* Centrage horizontal précis */
            opacity: 0;
            transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
            transform: translateY(20px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.8);
            pointer-events: none;
            /* Typo interne */
            font-size: 11px;
            letter-spacing: 0.1em;
            font-family: 'Inter', sans-serif;
        }

        .tooltip-container:hover .tooltip-content {
            visibility: visible;
            opacity: 1;
            transform: translateY(0);
        }

        /* Petite flèche sous l'info-bulle */
        .tooltip-content::after {
            content: "";
            position: absolute;
            top: 100%;
            left: 50%;
            margin-left: -8px;
            border-width: 8px;
            border-style: solid;
            border-color: var(--copper) transparent transparent transparent;
        }

        .highlight-link {
            border-bottom: 1px solid var(--copper-mid);
            text-decoration: none;
            padding-bottom: 2px;
            color: #ffffff;
            transition: all 0.4s ease;
        }

        .highlight-link:hover {
            border-bottom-color: var(--copper);
            color: var(--copper);
        }

        /* --- 6. FORMULAIRE --- */
        form {
            display: flex;
            flex-direction: column;
            width: 100%;
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }

        @media (min-width: 768px) {
            .form-grid {
                grid-template-columns: 1fr 1fr; /* Deux colonnes sur grand écran */
            }
        }

        .input-group {
            position: relative;
            margin-bottom: 2.5rem;
            width: 100%;
        }

        .contact-input {
            width: 100%;
            background: transparent;
            border: none;
            border-bottom: 1px solid var(--copper-low);
            padding: 1rem 0;
            color: #e5e7ff;
            letter-spacing: 1.7px;
            font-size: 1.1rem;
            transition: border-color 0.4s ease;
            box-sizing: border-box; /* Important pour que width 100% ne dépasse pas */
        }
    
        .contact-input:focus {
            outline: none;
            border-bottom-color: var(--copper);
        }

        /* Textarea spécifique */
        textarea.contact-input {
            height: 8rem;
            resize: none;
        }

        .contact-label {
            position: absolute;
            top: 1rem;
            left: 0;
            pointer-events: none;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 0.2em;
            font-size: 0.8rem;
            opacity: 0.5;
        }

        .contact-input:focus ~ .contact-label,
        .contact-input:not(:placeholder-shown) ~ .contact-label {
            top: -1.2rem;
            font-size: 0.7rem;
            opacity: 0.9;
            color: var(--copper);
        }

        /* Section du bas du formulaire (Captcha + Bouton) */
        .form-footer {
            display: flex;
            flex-direction: column;
            gap: 2rem;
            margin-top: 3rem;
            align-items: center;
        }

        @media (min-width: 768px) {
            .form-footer {
                flex-direction: row;
                justify-content: space-between;
                align-items: center;
            }
            .captcha-wrapper {
                width: 33%;
            }
        }

        .send-btn {
            position: relative;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 1.4rem 4rem;
            color: var(--copper);
            letter-spacing: 0.4em;
            text-transform: uppercase;
            font-family: 'Playfair Display', serif;
            font-size: 1rem;
            border: 1px solid var(--copper-mid);
            background: transparent;
            cursor: pointer;
            transition: all 0.5s ease;
        }

        .send-btn:hover {
            color: #ffffff;
            border-color: var(--copper);
            transform: translateY(-2px);
        }

        /* --- 7. ALERTES ET PIED DE PAGE --- */
        #custom-alert {
            position: fixed;
            bottom: 40px;
            right: 40px;
            background: #0a0a0a;
            border: 1px solid var(--copper);
            padding: 1.5rem 2.5rem;
            color: var(--copper);
            border-radius: 4px;
            transform: translateY(150%);
            transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1);
            z-index: 1000;
            font-size: 1.125rem;
            letter-spacing: 0.05em;
        }

        #custom-alert.visible {
            transform: translateY(0);
        }

        /* --- Footer --- */
        .back-link-container {
            text-align: center;
            margin-top: 4rem;
        }

        .back-link {
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 0.3em;
            opacity: 0.4;
            transition: opacity 0.3s;
            margin-bottom: 50px;
        }

        .back-link:hover {
            opacity: 1;
        }

        footer {
            padding-bottom: 4rem;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2rem;
        }

        .footer-legal {
            font-size: 11px;
            letter-spacing: 0.5em;
            text-transform: uppercase;
            opacity: 0.3;
            text-align: center;
        }

        /* --- 8. ANIMATIONS --- */
        .fade-in { animation: fadeIn 1.5s ease forwards; }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(15px); }
            to { opacity: 1; transform: translateY(0); }
        }