/* ============================================================================
   taxVD — Habillage « Liquid Glass »
   Couche posee APRES style.css : elle ne fait que redefinir l'apparence.
   Retirer le <link> de cette feuille rend au site son design precedent.

   Principes repris du materiau d'Apple :
   - un fond vivant et colore, sans quoi la transparence n'a rien a refracter
   - des surfaces translucides floutees (backdrop-filter) posees par couches
   - un liseré speculaire clair sur les bords et une lumiere interne en haut
   - des rayons tres arrondis, continus, et des ombres portees douces
   - une reponse au survol / a l'appui (echelle, lumiere) plutot qu'un a-plat
   Replis prevus : navigateurs sans backdrop-filter, transparence reduite,
   mouvement reduit, et petits ecrans (flou allege).
   ========================================================================= */

:root {
    /* Materiau */
    --glass-blur: 30px;
    --glass-blur-fort: 44px;
    --glass-sat: 175%;
    --glass-fond: rgba(255, 255, 255, .55);
    --glass-fond-fort: rgba(255, 255, 255, .72);
    --glass-fond-leger: rgba(255, 255, 255, .38);
    --glass-bord: rgba(255, 255, 255, .70);
    --glass-bord-bas: rgba(255, 255, 255, .30);
    --glass-lumiere: inset 0 1px 0 rgba(255, 255, 255, .92), inset 0 -1px 0 rgba(255, 255, 255, .22);
    --glass-ombre: 0 12px 40px rgba(6, 60, 45, .10), 0 2px 10px rgba(6, 60, 45, .06);
    --glass-ombre-forte: 0 24px 70px rgba(6, 60, 45, .16), 0 4px 14px rgba(6, 60, 45, .08);
    --glass-teinte-verte: rgba(16, 185, 129, .16);

    /* Geometrie */
    --r-xl: 34px;
    --r-lg: 26px;
    --r-md: 18px;
    --r-sm: 13px;
    --r-pill: 999px;

    --radius: var(--r-md);
    --radius-sm: var(--r-sm);
    --radius-lg: var(--r-lg);
}

/* ---------------------------------------------------------------- Fond ---- */
body {
    background: #eef7f2;
    color: var(--gray-800);
}

/* Nappe coloree fixe : c'est elle que le verre refracte */
body::before {
    content: "";
    position: fixed;
    inset: -20vmax;
    z-index: -2;
    background:
        radial-gradient(38vmax 38vmax at 12% 8%, rgba(16, 185, 129, .38), transparent 62%),
        radial-gradient(34vmax 34vmax at 88% 12%, rgba(56, 189, 248, .30), transparent 60%),
        radial-gradient(40vmax 40vmax at 78% 82%, rgba(52, 211, 153, .34), transparent 62%),
        radial-gradient(30vmax 30vmax at 22% 88%, rgba(250, 204, 21, .20), transparent 58%),
        linear-gradient(160deg, #f4fbf7 0%, #e8f6ef 45%, #eaf4fb 100%);
    animation: derive 34s ease-in-out infinite alternate;
}

/* Voile clair pour garder les textes lisibles par-dessus la nappe */
body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(255, 255, 255, .55), rgba(255, 255, 255, .30) 40%, rgba(255, 255, 255, .55));
}

@keyframes derive {
    0%   { transform: scale(1) translate3d(0, 0, 0); }
    50%  { transform: scale(1.08) translate3d(2%, -1.5%, 0); }
    100% { transform: scale(1.03) translate3d(-2%, 1.5%, 0); }
}

/* Le hero garde ses bulles, mais en orbes de verre */
.hero-shape {
    filter: blur(60px);
    opacity: .55;
    mix-blend-mode: multiply;
}

/* ------------------------------------------------------------ Materiau ---- */
/* Classe interne appliquee via les selecteurs plus bas */
.navbar,
.beta-banner,
.sim-form-card,
.sim-results-card,
.deduction-card,
.faq-item,
.strategy-card,
.timeline-content,
.stat-card,
.info-box,
.info-box-sm,
.warning-box,
.sources-box,
.comparateur,
.results-savings,
.results-details,
.deduction-group,
.usecase,
.footer {
    background:
        linear-gradient(180deg, var(--glass-fond-fort), var(--glass-fond)),
        linear-gradient(180deg, rgba(255, 255, 255, .55) 0%, rgba(255, 255, 255, .18) 38%, rgba(255, 255, 255, 0) 72%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
    border: 1px solid var(--glass-bord);
    border-bottom-color: var(--glass-bord-bas);
    box-shadow: var(--glass-ombre), var(--glass-lumiere);
    border-radius: var(--r-lg);
}

/* ------------------------------------------------------- Barre de nav ---- */
.beta-banner {
    border-radius: 0;
    border-left: 0;
    border-right: 0;
    border-top: 0;
    background:
        linear-gradient(180deg, rgba(255, 237, 213, .85), rgba(254, 215, 170, .70));
    color: #7c2d12;
    box-shadow: none;
}

.navbar {
    top: 46px;
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    width: min(1180px, calc(100% - 32px));
    border-radius: var(--r-pill);
    border-bottom-color: var(--glass-bord-bas);
    -webkit-backdrop-filter: blur(var(--glass-blur-fort)) saturate(var(--glass-sat));
    backdrop-filter: blur(var(--glass-blur-fort)) saturate(var(--glass-sat));
    transition: box-shadow .35s ease, transform .35s ease, width .35s ease;
}

.navbar.scrolled {
    width: min(1080px, calc(100% - 32px));
    box-shadow: var(--glass-ombre-forte), var(--glass-lumiere);
}

.nav-container { height: 62px; padding: 0 18px 0 22px; }

.nav-link {
    border-radius: var(--r-pill);
    padding: 9px 15px;
    transition: background .25s ease, color .25s ease;
}

.nav-link:hover { background: rgba(255, 255, 255, .55); }

.nav-link.active {
    background: linear-gradient(180deg, rgba(255, 255, 255, .95), rgba(255, 255, 255, .55));
    box-shadow: 0 1px 3px rgba(6, 60, 45, .10), inset 0 1px 0 #fff;
    color: var(--green-700);
}

/* --------------------------------------------------------------- Cartes ---- */
.sim-form-card,
.sim-results-card { border-radius: var(--r-xl); }

.deduction-card,
.strategy-card,
.stat-card,
.timeline-content { transition: transform .35s cubic-bezier(.2, .8, .2, 1), box-shadow .35s ease, border-color .35s ease; }

.deduction-card:hover,
.strategy-card:hover,
.timeline-content:hover {
    transform: translateY(-4px) scale(1.012);
    box-shadow: var(--glass-ombre-forte), var(--glass-lumiere);
    border-color: rgba(255, 255, 255, .95);
}

.results-details,
.results-savings,
.comparateur,
.sources-box {
    background: linear-gradient(180deg, rgba(255, 255, 255, .62), rgba(255, 255, 255, .38));
    border-radius: var(--r-md);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .85);
}

/* Bloc du total : verre teinte, c'est le point focal de la page */
.result-total {
    background:
        linear-gradient(180deg, rgba(16, 185, 129, .22), rgba(5, 150, 105, .12)),
        linear-gradient(180deg, rgba(255, 255, 255, .6) 0%, rgba(255, 255, 255, .16) 40%, rgba(255, 255, 255, 0) 75%);
    border: 1px solid rgba(255, 255, 255, .8);
    border-radius: var(--r-lg);
    box-shadow: 0 10px 30px rgba(5, 150, 105, .18), inset 0 1px 0 rgba(255, 255, 255, .95);
}

/* -------------------------------------------------------------- Boutons ---- */
.btn {
    border-radius: var(--r-pill);
    transition: transform .28s cubic-bezier(.2, .8, .2, 1), box-shadow .28s ease, background .28s ease;
}

.btn-primary {
    background:
        linear-gradient(180deg, rgb(52, 211, 153), rgb(5, 150, 105)),
        linear-gradient(180deg, rgba(255, 255, 255, .34) 0%, rgba(255, 255, 255, .12) 34%, rgba(255, 255, 255, 0) 62%);
    /* AUCUNE bordure sur le bouton plein. Testé en conditions réelles sur
       Safari (page test-boutons.html) : une bordure, meme transparente, y
       fait apparaitre un trait sombre d'un point sur le bord superieur.
       La bordure retiree est compensee par 1 px de rembourrage, pour que le
       bouton garde exactement la meme taille que les boutons bordes qui
       l'accompagnent (verifie : 50 px dans le hero, 45 px dans le formulaire). */
    border: 0;
    padding: 13px 25px;
    box-shadow: 0 8px 22px rgba(5, 150, 105, .32), inset 0 1px 2px rgba(255, 255, 255, .30);
}

.btn-primary.btn-lg { padding: 15px 33px; }

.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 14px 32px rgba(5, 150, 105, .38), inset 0 1px 3px rgba(255, 255, 255, .38);
}

.btn-outline,
.btn-ghost,
.btn-reset {
    background: linear-gradient(180deg, rgba(255, 255, 255, .78), rgba(255, 255, 255, .48));
    -webkit-backdrop-filter: blur(18px) saturate(160%);
    backdrop-filter: blur(18px) saturate(160%);
    border: 1px solid rgba(255, 255, 255, .8);
    box-shadow: 0 4px 14px rgba(6, 60, 45, .08), inset 0 1px 0 rgba(255, 255, 255, .9);
    color: var(--gray-800);
}

.btn-outline:hover,
.btn-ghost:hover,
.btn-reset:hover {
    transform: translateY(-2px) scale(1.02);
    background: linear-gradient(180deg, rgba(255, 255, 255, .92), rgba(255, 255, 255, .62));
    box-shadow: 0 10px 26px rgba(6, 60, 45, .12), inset 0 1px 0 #fff;
}

.btn:active { transform: translateY(0) scale(.985); }

/* --------------------------------------------------------- Formulaires ---- */
.form-group input[type="text"],
.form-group input[type="number"],
.form-group select,
.input-with-icon input[type="text"],
.input-with-unit input {
    background: linear-gradient(180deg, rgba(255, 255, 255, .85), rgba(255, 255, 255, .62));
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border: 1px solid rgba(255, 255, 255, .9);
    border-radius: var(--r-sm);
    box-shadow: inset 0 2px 6px rgba(6, 60, 45, .07), 0 1px 0 rgba(255, 255, 255, .8);
    transition: box-shadow .25s ease, border-color .25s ease, background .25s ease;
}

.form-group input:focus,
.form-group select:focus,
.input-with-unit input:focus {
    border-color: rgba(16, 185, 129, .55);
    box-shadow: inset 0 2px 6px rgba(6, 60, 45, .06), 0 0 0 4px rgba(16, 185, 129, .18);
    background: rgba(255, 255, 255, .95);
}

.radio-card-inner,
.filter-btn,
.deduction-toggle,
.number-input {
    background: linear-gradient(180deg, rgba(255, 255, 255, .72), rgba(255, 255, 255, .45));
    -webkit-backdrop-filter: blur(16px) saturate(160%);
    backdrop-filter: blur(16px) saturate(160%);
    border: 1px solid rgba(255, 255, 255, .8);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .9);
    transition: transform .25s cubic-bezier(.2, .8, .2, 1), box-shadow .25s ease, background .25s ease;
}

.filter-btn,
.number-input { border-radius: var(--r-pill); }
.radio-card-inner { border-radius: var(--r-md); }
.deduction-toggle { border-radius: var(--r-md); }

.radio-card:hover .radio-card-inner,
.filter-btn:hover { transform: translateY(-2px); }

.radio-card.active .radio-card-inner,
.radio-card input:checked + .radio-card-inner,
.filter-btn.active,
.deduction-toggle.active {
    background:
        linear-gradient(180deg, rgba(52, 211, 153, .28), rgba(5, 150, 105, .16)),
        linear-gradient(180deg, rgba(255, 255, 255, .5) 0%, rgba(255, 255, 255, .14) 40%, rgba(255, 255, 255, 0) 72%);
    border-color: rgba(16, 185, 129, .45);
    box-shadow: 0 6px 18px rgba(5, 150, 105, .18), inset 0 1px 0 rgba(255, 255, 255, .9);
    color: var(--green-800);
}

/* ------------------------------------------------------------ FAQ / etc ---- */
.faq-item { overflow: hidden; }
.faq-question { background: transparent; }
.faq-question:hover { background: rgba(255, 255, 255, .45); }

.comparateur-table tr.ligne-active td {
    background: linear-gradient(180deg, rgba(52, 211, 153, .22), rgba(5, 150, 105, .12));
}

/* ------------------------------------------------------------- Sections ---- */
.section-badge,
.hero-badge,
.deduction-category,
.timeline-badge,
.strategy-badge,
.beta-badge {
    -webkit-backdrop-filter: blur(12px) saturate(160%);
    backdrop-filter: blur(12px) saturate(160%);
    border: 1px solid rgba(255, 255, 255, .7);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .9);
    border-radius: var(--r-pill);
}

/* --------------------------------------------------------------- Footer ---- */
.footer {
    background:
        linear-gradient(180deg, rgba(17, 24, 39, .82), rgba(17, 24, 39, .92));
    border: 0;
    border-top: 1px solid rgba(255, 255, 255, .12);
    border-radius: var(--r-xl) var(--r-xl) 0 0;
    box-shadow: 0 -10px 40px rgba(6, 60, 45, .12);
    color: var(--gray-300);
}

/* ---------------------------------------------------------- Mode sombre ---- */
@media (prefers-color-scheme: dark) {
    :root {
        --glass-fond: rgba(22, 32, 50, .55);
        --glass-fond-fort: rgba(26, 38, 58, .70);
        --glass-fond-leger: rgba(22, 32, 50, .38);
        --glass-bord: rgba(255, 255, 255, .16);
        --glass-bord-bas: rgba(255, 255, 255, .06);
        --glass-lumiere: inset 0 1px 0 rgba(255, 255, 255, .18), inset 0 -1px 0 rgba(255, 255, 255, .04);
        --glass-ombre: 0 14px 44px rgba(0, 0, 0, .45), 0 2px 10px rgba(0, 0, 0, .3);
        --glass-ombre-forte: 0 26px 70px rgba(0, 0, 0, .55), 0 4px 14px rgba(0, 0, 0, .35);
    }

    body { background: #060d18; color: #e5e7eb; }

    body::before {
        background:
            radial-gradient(38vmax 38vmax at 12% 8%, rgba(16, 185, 129, .30), transparent 62%),
            radial-gradient(34vmax 34vmax at 88% 12%, rgba(56, 189, 248, .22), transparent 60%),
            radial-gradient(40vmax 40vmax at 78% 82%, rgba(5, 150, 105, .28), transparent 62%),
            linear-gradient(160deg, #071322 0%, #08182a 50%, #071522 100%);
    }

    body::after {
        background: linear-gradient(180deg, rgba(4, 10, 18, .55), rgba(4, 10, 18, .35) 40%, rgba(4, 10, 18, .55));
    }

    .beta-banner { background: linear-gradient(180deg, rgba(120, 53, 15, .75), rgba(120, 53, 15, .55)); color: #fde68a; }

    .nav-link:hover { background: rgba(255, 255, 255, .08); }
    .nav-link.active { background: rgba(255, 255, 255, .12); color: #6ee7b7; box-shadow: inset 0 1px 0 rgba(255, 255, 255, .18); }

    .results-details, .results-savings, .comparateur, .sources-box {
        background: linear-gradient(180deg, rgba(255, 255, 255, .07), rgba(255, 255, 255, .03));
        box-shadow: inset 0 1px 0 rgba(255, 255, 255, .10);
    }

    .form-group input[type="text"],
    .form-group input[type="number"],
    .form-group select,
    .input-with-icon input[type="text"],
    .input-with-unit input {
        background: linear-gradient(180deg, rgba(255, 255, 255, .10), rgba(255, 255, 255, .05));
        border-color: rgba(255, 255, 255, .16);
        box-shadow: inset 0 2px 6px rgba(0, 0, 0, .35);
        color: #e5e7eb;
    }

    .btn-outline, .btn-ghost, .btn-reset {
        background: linear-gradient(180deg, rgba(255, 255, 255, .12), rgba(255, 255, 255, .06));
        border-color: rgba(255, 255, 255, .18);
        box-shadow: inset 0 1px 0 rgba(255, 255, 255, .16);
        color: #e5e7eb;
    }

    .radio-card-inner, .filter-btn, .deduction-toggle, .number-input {
        background: linear-gradient(180deg, rgba(255, 255, 255, .10), rgba(255, 255, 255, .05));
        border-color: rgba(255, 255, 255, .16);
        box-shadow: inset 0 1px 0 rgba(255, 255, 255, .14);
    }

    .footer { background: linear-gradient(180deg, rgba(6, 13, 24, .85), rgba(6, 13, 24, .95)); }
}

/* ------------------------------------------------------- Ecrans etroits ---- */
/* Le flou coute cher en GPU : on l'allege sur telephone. */
@media (max-width: 768px) {
    :root { --glass-blur: 18px; --glass-blur-fort: 24px; }
    .navbar { width: calc(100% - 20px); border-radius: var(--r-lg); }
    .nav-container { height: 56px; }
    body::before { animation: none; }
}

/* ------------------------------------------------------------- Replis ---- */
/* 1. Navigateur sans backdrop-filter : on rend les surfaces opaques. */
@supports not ((-webkit-backdrop-filter: blur(2px)) or (backdrop-filter: blur(2px))) {
    .navbar, .sim-form-card, .sim-results-card, .deduction-card, .faq-item,
    .strategy-card, .timeline-content, .stat-card, .info-box, .sources-box,
    .comparateur, .results-savings, .results-details, .deduction-group {
        background: #fff;
        border-color: var(--gray-200);
    }
    @media (prefers-color-scheme: dark) {
        .navbar, .sim-form-card, .sim-results-card, .deduction-card, .faq-item,
        .strategy-card, .timeline-content, .stat-card, .info-box, .sources-box,
        .comparateur, .results-savings, .results-details, .deduction-group {
            background: #131c2e;
            border-color: #24304a;
        }
    }
}

/* 2. Transparence reduite demandee par le systeme : materiau opaque. */
@media (prefers-reduced-transparency: reduce) {
    .navbar, .sim-form-card, .sim-results-card, .deduction-card, .faq-item,
    .strategy-card, .timeline-content, .stat-card, .info-box, .info-box-sm,
    .sources-box, .comparateur, .results-savings, .results-details,
    .deduction-group, .btn-outline, .btn-ghost, .btn-reset, .radio-card-inner,
    .filter-btn, .deduction-toggle, .number-input {
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
        background: #fff;
        border-color: var(--gray-200);
    }
    body::before { background: #f4fbf7; animation: none; }
    body::after { display: none; }
    @media (prefers-color-scheme: dark) {
        .navbar, .sim-form-card, .sim-results-card, .deduction-card, .faq-item,
        .strategy-card, .timeline-content, .stat-card, .info-box, .info-box-sm,
        .sources-box, .comparateur, .results-savings, .results-details,
        .deduction-group, .btn-outline, .btn-ghost, .btn-reset, .radio-card-inner,
        .filter-btn, .deduction-toggle, .number-input {
            background: #131c2e;
            border-color: #24304a;
        }
        body::before { background: #060d18; }
    }
}

/* 3. Mouvement reduit : plus de derive de fond ni d'echelle au survol. */
@media (prefers-reduced-motion: reduce) {
    body::before { animation: none; }
    .btn, .deduction-card, .strategy-card, .timeline-content,
    .radio-card-inner, .filter-btn { transition: none; }
    .btn-primary:hover, .btn-outline:hover, .btn-ghost:hover, .btn-reset:hover,
    .deduction-card:hover, .strategy-card:hover, .timeline-content:hover,
    .radio-card:hover .radio-card-inner, .filter-btn:hover { transform: none; }
}

/* 4. Impression : pas de verre, pas de fond. */
@media print {
    body::before, body::after { display: none !important; }
    .sim-results-card, .results-details, .results-savings, .comparateur, .sources-box {
        background: #fff !important;
        -webkit-backdrop-filter: none !important;
        backdrop-filter: none !important;
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
}

/* ------------------------------------------------ Reglages apres essais ---- */
/* La barre flottante mange le haut des sections : on degage la place. */
.section { padding-top: 148px; }
.hero-section { padding-top: 128px; }
@media (max-width: 768px) {
    .section { padding-top: 118px; }
    .hero-section { padding-top: 104px; }
}

/* Le voile etait trop blanc : la couleur du fond doit rester perceptible,
   sinon le verre n'a rien a refracter. */
body::after {
    background: linear-gradient(180deg, rgba(255, 255, 255, .28), rgba(255, 255, 255, .10) 45%, rgba(255, 255, 255, .34));
}

/* Nappe un peu plus dense et contrastee */
body::before {
    background:
        radial-gradient(36vmax 36vmax at 10% 6%, rgba(16, 185, 129, .52), transparent 60%),
        radial-gradient(32vmax 32vmax at 90% 10%, rgba(56, 189, 248, .42), transparent 58%),
        radial-gradient(42vmax 42vmax at 80% 78%, rgba(45, 212, 191, .46), transparent 62%),
        radial-gradient(28vmax 28vmax at 18% 86%, rgba(250, 204, 21, .28), transparent 56%),
        radial-gradient(26vmax 26vmax at 50% 45%, rgba(167, 243, 208, .40), transparent 60%),
        linear-gradient(160deg, #eefaf4 0%, #ddf1e8 45%, #e2eef9 100%);
}

@media (prefers-color-scheme: dark) {
    body::after {
        background: linear-gradient(180deg, rgba(4, 10, 18, .40), rgba(4, 10, 18, .18) 45%, rgba(4, 10, 18, .42));
    }
}

/* -------------------------------------- Lisibilite en mode sombre ---- */
/* Le verre sombre est plus clair que le fond d'origine : certains textes
   secondaires et accents verts foncés n'y passaient plus le seuil de
   contraste. On les eclaircit explicitement. */
@media (prefers-color-scheme: dark) {
    .section-subtitle,
    .form-hint,
    .results-placeholder p,
    .comparateur-resume,
    .sources-box,
    .sources-box p,
    .savings-empty,
    .deduction-card p,
    .strategy-card p,
    .timeline-content p,
    .faq-answer,
    .faq-answer p,
    .footer p,
    .footer-links a { color: #aab6c8; }

    .radio-card.active .radio-card-inner,
    .radio-card input:checked + .radio-card-inner,
    .radio-card.active .radio-card-inner span,
    .filter-btn.active,
    .deduction-toggle.active,
    .nav-link.active,
    .section-badge,
    .hero-badge,
    .deduction-category,
    .saving-amount { color: #6ee7b7; }

    .result-total {
        background:
            linear-gradient(180deg, rgba(16, 185, 129, .20), rgba(5, 150, 105, .08)),
            linear-gradient(180deg, rgba(255, 255, 255, .10) 0%, rgba(255, 255, 255, .03) 40%, rgba(255, 255, 255, 0) 75%);
        border-color: rgba(110, 231, 183, .35);
        box-shadow: 0 10px 30px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(255, 255, 255, .18);
    }
    .result-total-amount { color: #6ee7b7; }
    .result-total-label, .result-total-sub { color: #cbd5e1; }

    .result-monthly {
        background: rgba(255, 255, 255, .07);
        border: 1px solid rgba(255, 255, 255, .12);
        color: #e5e7eb;
    }

    .detail-chip { background: rgba(255, 255, 255, .08); color: #dbe3ee; }
    .detail-row span { color: #dbe3ee; }
    .comparateur-table th { color: #9aa6b8; }
    .comparateur-table td { border-bottom-color: rgba(255, 255, 255, .08); }
    .info-box-sm { background: rgba(16, 185, 129, .14); color: #d8f5e7; }
    .deduction-tip { background: rgba(16, 185, 129, .12); color: #d8f5e7; }
    .sources-box a, .footer a:hover { color: #6ee7b7; }
}

/* --------------------------------- Lisibilite en mode clair ---- */
/* Sur verre clair, les gris 400/500 d'origine tombaient sous le seuil de
   contraste 4.5:1. On les fonce (le footer garde ses gris clairs : il est
   sur fond sombre). */
@media (prefers-color-scheme: light) {
    .form-hint,
    .results-placeholder p,
    .form-group .form-hint,
    .comparateur .form-hint { color: #5c6675; }

    .section-subtitle,
    .deduction-card p,
    .strategy-card p,
    .timeline-content p,
    .result-total-label,
    .result-total-sub,
    .faq-answer,
    .faq-answer p { color: #4b5563; }
}

/* ------------------------------------------------- Cout du flou ---- */
/* Chaque backdrop-filter est une passe de composition supplementaire.
   Mesure sur cette page : ~77 ms/frame au defilement avec le flou partout,
   ~16 ms sans. On garde donc le vrai flou pour les grandes surfaces de
   l'interface (barre, panneaux du simulateur, pied de page) et on laisse
   les listes de cartes en simple translucidite : sur un fond en degrade
   doux, l'oeil ne fait pas la difference. */
.deduction-card,
.faq-item,
.strategy-card,
.timeline-content,
.stat-card,
.info-box,
.info-box-sm,
.warning-box,
.deduction-group,
.radio-card-inner,
.filter-btn,
.deduction-toggle,
.number-input,
.btn-outline,
.btn-ghost,
.btn-reset,
.form-group input[type="text"],
.form-group input[type="number"],
.form-group select,
.input-with-icon input[type="text"],
.input-with-unit input {
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
}

/* Sur telephone, on retire aussi le flou des grands panneaux : la surface
   floutee y occupe presque tout l'ecran, c'est la ou ca coute le plus cher. */
@media (max-width: 900px) {
    .sim-form-card,
    .sim-results-card {
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
        background: linear-gradient(180deg, rgba(255, 255, 255, .86), rgba(255, 255, 255, .74));
    }
    /* Le pied de page est sombre a toutes les tailles : sans flou il faut
       garder sa teinte foncee, sinon il vire au clair sur telephone. */
    .footer {
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
        background: linear-gradient(180deg, rgba(17, 24, 39, .96), rgba(17, 24, 39, .99));
    }
    @media (prefers-color-scheme: dark) {
        .sim-form-card,
        .sim-results-card {
            background: linear-gradient(180deg, rgba(26, 38, 58, .92), rgba(22, 32, 50, .86));
        }
        .footer { background: linear-gradient(180deg, rgba(6, 13, 24, .95), rgba(6, 13, 24, .98)); }
    }
}

/* Coordonnees de l'ACI : texte, pas des liens (elles pointaient sur "#") */
.footer-links .footer-info {
    display: block;
    color: var(--gray-400);
    font-size: .85rem;
    padding: 4px 0;
}

/* ------------------------------------------------ Barre plus transparente ---- */
/* Demande : voir davantage la page a travers le menu. On baisse la teinte
   blanche (0,72/0,55 -> 0,42/0,26) et on compense par un flou plus large et
   plus sature : le contenu qui defile dessous reste lisible en filigrane,
   sans que les libelles du menu perdent en contraste. */
.navbar {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, .42), rgba(255, 255, 255, .26)),
        linear-gradient(180deg, rgba(255, 255, 255, .30) 0%, rgba(255, 255, 255, .10) 42%, rgba(255, 255, 255, 0) 78%);
    -webkit-backdrop-filter: blur(52px) saturate(195%);
    backdrop-filter: blur(52px) saturate(195%);
    border-color: rgba(255, 255, 255, .58);
    box-shadow: 0 10px 34px rgba(6, 60, 45, .10), inset 0 1px 0 rgba(255, 255, 255, .75);
}

/* Une fois la page defilee, du contenu passe derriere la barre : on remonte
   legerement la teinte pour garder les libelles nets. */
.navbar.scrolled {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, .56), rgba(255, 255, 255, .40)),
        linear-gradient(180deg, rgba(255, 255, 255, .32) 0%, rgba(255, 255, 255, .10) 42%, rgba(255, 255, 255, 0) 78%);
}

@media (prefers-color-scheme: dark) {
    .navbar {
        background:
            linear-gradient(180deg, rgba(20, 30, 48, .40), rgba(18, 27, 44, .26)),
            linear-gradient(180deg, rgba(255, 255, 255, .10) 0%, rgba(255, 255, 255, .03) 42%, rgba(255, 255, 255, 0) 78%);
        border-color: rgba(255, 255, 255, .14);
        box-shadow: 0 12px 40px rgba(0, 0, 0, .45), inset 0 1px 0 rgba(255, 255, 255, .14);
    }
    .navbar.scrolled {
        background:
            linear-gradient(180deg, rgba(20, 30, 48, .58), rgba(18, 27, 44, .44)),
            linear-gradient(180deg, rgba(255, 255, 255, .10) 0%, rgba(255, 255, 255, .03) 42%, rgba(255, 255, 255, 0) 78%);
    }
}