/* ============================================================
   Laurent Leynaud — Système de design "Solar Engineering"
   Palette : Ardoise profond + Ambre solaire (accent unique)
   Typo    : Space Grotesk (titres) / Inter (corps)
   ============================================================ */

:root {
    --slate-950: #0b1120;
    --slate-900: #0f172a;
    --slate-800: #1e293b;
    --slate-700: #334155;
    --slate-500: #64748b;
    --slate-400: #94a3b8;
    --slate-200: #e2e8f0;
    --slate-100: #f1f5f9;
    --slate-50:  #f8fafc;

    --amber-600: #d97706;
    --amber-500: #f59e0b;
    --amber-400: #fbbf24;
    --amber-300: #fcd34d;

    --ring: rgba(245, 158, 11, 0.35);
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 6px 24px -8px rgba(15, 23, 42, 0.18);
    --shadow-lg: 0 18px 48px -16px rgba(15, 23, 42, 0.28);
}

/* ---------- Typographie ---------- */
body {
    font-family: 'Inter', sans-serif;
    color: var(--slate-800);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4,
.font-display {
    font-family: 'Space Grotesk', 'Inter', sans-serif;
    letter-spacing: -0.02em;
}

/* Petit label technique en capitales espacées (eyebrow) */
.eyebrow {
    font-family: 'Space Grotesk', sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.22em;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--amber-600);
}
.eyebrow::before {
    content: "";
    display: inline-block;
    width: 26px;
    height: 2px;
    background: var(--amber-500);
    vertical-align: middle;
    margin-right: 0.6rem;
    margin-bottom: 3px;
}

/* ---------- Fond hero : ardoise + grille technique + halo solaire ---------- */
.bg-solar-gradient {
    background-color: var(--slate-950);
    background-image:
        radial-gradient(1100px 620px at 78% -8%, rgba(245, 158, 11, 0.20), transparent 60%),
        radial-gradient(720px 520px at 12% 108%, rgba(56, 189, 248, 0.10), transparent 60%),
        linear-gradient(180deg, var(--slate-950) 0%, var(--slate-900) 100%);
    position: relative;
}
/* Grille fine "plan technique" */
.bg-solar-gradient::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.06) 1px, transparent 1px);
    background-size: 46px 46px;
    mask-image: radial-gradient(ellipse 90% 80% at 50% 40%, #000 55%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 40%, #000 55%, transparent 100%);
    pointer-events: none;
}

/* Ancien conteneur de particules neutralisé (plus de particules décoratives) */
.particles { display: none !important; }

/* ---------- Cartes ---------- */
.bg-solar-card {
    background: #ffffff;
    border: 1px solid var(--slate-200);
    box-shadow: var(--shadow-sm);
    border-radius: 14px;
}

.card-hover {
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(245, 158, 11, 0.45);
}

/* ---------- Accent bar : petit trait sous les titres de section ---------- */
.section-title {
    position: relative;
    display: inline-block;
}
.section-title::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: -14px;
    transform: translateX(-50%);
    width: 54px;
    height: 3px;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--amber-500), var(--amber-300));
}

/* ---------- Boutons ---------- */
.btn-solar {
    background: var(--amber-500);
    color: var(--slate-950);
    border-radius: 10px;
    font-weight: 600;
    transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 8px 20px -8px rgba(245, 158, 11, 0.6);
}
.btn-solar:hover {
    background: var(--amber-400);
    transform: translateY(-2px);
}

.btn-ghost {
    border: 1px solid rgba(226, 232, 240, 0.35);
    color: #ffffff;
    border-radius: 10px;
    font-weight: 600;
    transition: all 0.2s ease;
}
.btn-ghost:hover {
    border-color: var(--amber-400);
    color: var(--amber-300);
    transform: translateY(-2px);
}

/* ---------- Puces / tags uniformisés (slate neutre + accent au hover) ---------- */
.tag {
    display: inline-flex;
    align-items: center;
    background: var(--slate-100);
    color: var(--slate-700);
    border: 1px solid var(--slate-200);
    padding: 0.25rem 0.7rem;
    border-radius: 6px;
    font-size: 0.78rem;
    font-weight: 500;
}

/* Tag "IA/AI" mis en avant (accent ambre) */
.tag-ai {
    background: rgba(245, 158, 11, 0.12);
    color: var(--amber-600);
    border-color: rgba(245, 158, 11, 0.35);
    font-weight: 600;
}

/* ---------- Navigation ---------- */
#navbar { transition: all 0.3s ease; }
.nav-sticky {
    backdrop-filter: blur(12px);
    background-color: rgba(255, 255, 255, 0.92);
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.06), var(--shadow-sm);
}
.nav-sticky .nav-link { color: var(--slate-700) !important; }
.nav-sticky .nav-link:hover { color: var(--amber-600) !important; }
.nav-sticky .text-white { color: var(--slate-900) !important; }
.nav-sticky .brand-mark { color: var(--amber-600) !important; }
.nav-sticky .lang-btn.active {
    background-color: var(--slate-900) !important;
    color: #fff !important;
}
.nav-sticky .lang-btn:not(.active) {
    color: var(--slate-500) !important;
    border: 1px solid var(--slate-200);
}
.nav-sticky .lang-btn:not(.active):hover {
    color: var(--slate-900) !important;
    background-color: var(--slate-100) !important;
}
.nav-sticky #mobile-menu-btn { color: var(--slate-900) !important; }
.nav-sticky #mobile-menu-btn:hover { color: var(--amber-600) !important; }

.nav-link { position: relative; }
.nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 0;
    height: 2px;
    background: var(--amber-500);
    transition: width 0.25s ease;
}
.nav-link:hover::after { width: 100%; }

/* ---------- Timeline ---------- */
.timeline::before {
    background: linear-gradient(to bottom, var(--amber-400), var(--slate-300));
}
.timeline-dot {
    background: var(--amber-500);
    border: 4px solid #fff;
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.18);
}

/* ---------- Visuel projet : fond ardoise uniforme + icône ambre ---------- */
.project-visual {
    background: linear-gradient(135deg, var(--slate-800), var(--slate-900));
    position: relative;
    overflow: hidden;
}
.project-visual::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.10) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.10) 1px, transparent 1px);
    background-size: 26px 26px;
    opacity: 0.5;
}
.project-visual i {
    color: var(--amber-400);
    position: relative;
    z-index: 1;
}

/* ---------- Animations (conservées, un peu plus sobres) ---------- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes slideInLeft {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}
.animate-fadeInUp { animation: fadeInUp 0.7s ease-out both; }
.animate-slideInLeft { animation: slideInLeft 0.6s ease-out both; }

@media (prefers-reduced-motion: reduce) {
    .animate-fadeInUp, .animate-slideInLeft { animation: none; }
}

/* ---------- Select formulaire ---------- */
select.contact-select { color: #fff; }
select.contact-select option {
    color: var(--slate-800) !important;
    background-color: #fff !important;
    padding: 8px 12px;
}