:root {
    --bg: #050816;
    --bg-alt: #0b1020;
    --accent: #4f46e5;
    --accent-soft: rgba(79, 70, 229, 0.12);
    --text: #f9fafb;
    --muted: #9ca3af;
    --card-bg: #111827;
    --border: #1f2937;
    --danger: #ef4444;
    --radius-lg: 1.25rem;
    --radius-md: 0.75rem;
    --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.6);
    --max-width: 1120px;
    --transition-fast: 180ms ease-out;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
    background-color: var(--bg);
    color: var(--text);
}

body {
    min-height: 100vh;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.25rem;
}

/* HEADER */

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(18px);
    background: linear-gradient(
            to bottom,
            rgba(5, 8, 22, 0.95),
            rgba(5, 8, 22, 0.8),
            transparent
    );
    border-bottom: 1px solid rgba(31, 41, 55, 0.7);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.8rem 0.25rem;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.logo-text {
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    font-size: 0.9rem;
}

.main-nav a {
    padding: 0.3rem 0;
    position: relative;
}

.main-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -0.25rem;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), #22d3ee);
    border-radius: 999px;
    transition: width var(--transition-fast);
}

.main-nav a:hover::after {
    width: 100%;
}

/* HERO */

.hero {
    padding: 4.5rem 0 3.5rem;
}

.hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1.1fr);
    gap: 2.75rem;
    align-items: center;
}

.hero-text h1 {
    font-size: clamp(2.1rem, 4vw, 3.1rem);
    line-height: 1.1;
    margin: 0 0 1.1rem;
}

.hero-text p {
    margin: 0 0 1.75rem;
    color: var(--muted);
    max-width: 34rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 1.4rem;
    border-radius: 999px;
    border: 1px solid transparent;
    font-size: 0.92rem;
    cursor: pointer;
    transition: background-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

.btn.primary {
    background: linear-gradient(135deg, var(--accent), #22d3ee);
    color: white;
    box-shadow: 0 16px 30px rgba(56, 189, 248, 0.25);
}

.btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 20px 40px rgba(56, 189, 248, 0.32);
}

.btn.secondary {
    background-color: transparent;
    border-color: rgba(156, 163, 175, 0.4);
    color: var(--muted);
}

.btn.secondary:hover {
    border-color: rgba(249, 250, 251, 0.7);
    color: #e5e7eb;
}

.hero-visual {
    display: flex;
    justify-content: center;
}

.hero-illustration {
    width: 100%;
    max-width: 360px;
    border-radius: 1.8rem;
    background: radial-gradient(circle at top, rgba(56, 189, 248, 0.15), transparent 60%),
    radial-gradient(circle at bottom, rgba(129, 140, 248, 0.2), transparent 55%),
    #020617;
    padding: 1.6rem 1.4rem 1.9rem;
    border: 1px solid rgba(55, 65, 81, 0.9);
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.hero-illustration h2 {
    margin: 0;
    font-size: 1.2rem;
}

.hero-illustration p {
    margin: 0;
    color: var(--muted);
    font-size: 0.95rem;
}

.badge {
    display: inline-block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    padding: 0.4rem 0.9rem;
    border-radius: 999px;
    background-color: rgba(15, 23, 42, 0.9);
    border: 1px solid rgba(148, 163, 184, 0.7);
    color: #e5e7eb;
}

/* SECTIONS */

.section {
    padding: 3.5rem 0;
}

.section-alt {
    background: radial-gradient(circle at top, rgba(56, 189, 248, 0.1), transparent 60%),
    #020617;
    border-top: 1px solid rgba(31, 41, 55, 0.7);
    border-bottom: 1px solid rgba(31, 41, 55, 0.7);
}

.section h2 {
    font-size: 1.6rem;
    margin: 0 0 0.5rem;
}

.section-intro {
    margin: 0 0 2rem;
    color: var(--muted);
    max-width: 36rem;
}

/* GRID & CARDS */

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
}

.card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 1.4rem 1.3rem;
    border: 1px solid rgba(31, 41, 55, 0.9);
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.7);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    border-color var(--transition-fast), background var(--transition-fast);
}

.card h3 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 1.05rem;
}

.card p {
    margin: 0;
    color: var(--muted);
    font-size: 0.95rem;
}

.card:hover {
    transform: translateY(-3px);
    border-color: rgba(96, 165, 250, 0.95);
    background: radial-gradient(circle at top, rgba(59, 130, 246, 0.15), transparent 55%),
    #020617;
}

/* REVIEWS */

.reviews {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
}

.review-card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 1.4rem 1.3rem;
    border: 1px solid rgba(31, 41, 55, 0.9);
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.7);
}

.review-text {
    margin: 0 0 0.7rem;
    font-style: italic;
    color: #e5e7eb;
}

.review-author {
    margin: 0;
    color: var(--muted);
    font-size: 0.9rem;
}

/* CONTACT */

.contact-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.4fr);
    gap: 1.75rem;
    align-items: flex-start;
}

.contact-block {
    margin-top: 1.25rem;
    padding: 1rem 1.1rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(31, 41, 55, 0.9);
    background-color: rgba(15, 23, 42, 0.95);
}

.contact-form-wrapper {
    background-color: rgba(15, 23, 42, 0.98);
    border-radius: var(--radius-lg);
    padding: 1.5rem 1.4rem;
    border: 1px solid rgba(31, 41, 55, 0.9);
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.8);
}

.contact-form,
.newsletter-form {
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

label {
    font-size: 0.84rem;
    color: var(--muted);
}

input[type="text"],
input[type="email"],
textarea {
    border-radius: 0.75rem;
    border: 1px solid rgba(55, 65, 81, 0.95);
    background-color: rgba(15, 23, 42, 0.96);
    color: var(--text);
    padding: 0.6rem 0.75rem;
    font-size: 0.92rem;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

input::placeholder,
textarea::placeholder {
    color: rgba(148, 163, 184, 0.8);
}

input:focus,
textarea:focus {
    border-color: rgba(96, 165, 250, 0.95);
    box-shadow: 0 0 0 1px rgba(96, 165, 250, 0.5);
    background-color: #020617;
}

textarea {
    resize: vertical;
}

.form-actions {
    display: flex;
    gap: 0.7rem;
    flex-wrap: wrap;
}

.newsletter {
    margin-top: 1.5rem;
    padding-top: 1.1rem;
    border-top: 1px dashed rgba(55, 65, 81, 0.8);
}

.newsletter-form {
    flex-direction: row;
    gap: 0.6rem;
}

.newsletter-form input[type="email"] {
    flex: 1;
}

/* FOOTER */

.site-footer {
    border-top: 1px solid rgba(31, 41, 55, 0.9);
    padding: 1.3rem 0;
    background: radial-gradient(circle at top, rgba(56, 189, 248, 0.16), transparent 55%),
    #020617;
}

.footer-inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.6rem;
    font-size: 0.85rem;
    color: var(--muted);
}

/* CHAT WIDGET */

#chat-widget {
    position: fixed;
    right: 1.2rem;
    bottom: 1.2rem;
    z-index: 50;
}

#chat-toggle {
    width: 3rem;
    height: 3rem;
    border-radius: 999px;
    border: none;
    cursor: pointer;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent), #22d3ee);
    color: #fff;
    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.8);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

#chat-toggle:hover {
    transform: translateY(-1px) scale(1.03);
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.9);
}

#chat-window {
    position: absolute;
    right: 0;
    bottom: 3.8rem;
    width: min(420px, 95vw);
    height: 560px;
    border-radius: 1.1rem;
    overflow: hidden;
    background-color: #020617;
    border: 1px solid rgba(31, 41, 55, 0.95);
    box-shadow: 0 20px 60px rgba(15, 23, 42, 0.95);
    display: none;
    flex-direction: column;
}

.chat-header {
    padding: 0.7rem 0.9rem;
    border-bottom: 1px solid rgba(31, 41, 55, 0.9);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.26), transparent 60%),
    #020617;
}

.chat-header span {
    font-size: 0.95rem;
    font-weight: 600;
}

#chat-close {
    border: none;
    background: transparent;
    color: #e5e7eb;
    font-size: 1.2rem;
    cursor: pointer;
}

.chat-body {
    flex: 1;
    background-color: #020617;
}

.chat-body iframe {
    border: none;
    width: 100%;
    height: 100%;
}

/* RESPONSIVE */

@media (max-width: 900px) {
    .hero-inner {
        grid-template-columns: minmax(0, 1fr);
    }

    .hero-visual {
        order: -1;
    }

    .contact-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .grid-3 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .header-inner {
        flex-wrap: wrap;
        justify-content: space-between;
    }
}

@media (max-width: 640px) {
    .grid-3 {
        grid-template-columns: minmax(0, 1fr);
    }

    .main-nav {
        display: none; /* pour simplifier, on cache le menu sur mobile */
    }

    .hero {
        padding-top: 3.5rem;
    }

    .newsletter-form {
        flex-direction: column;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }
}

.services-vertical {
    display: flex;
    flex-direction: column;
    gap: 2.8rem;
    margin-top: 2rem;
}

.service-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
    background-color: var(--card-bg);
    border: 1px solid rgba(31,41,55,0.9);
    padding: 1.8rem;
    border-radius: var(--radius-lg);
    box-shadow: 0 14px 30px rgba(15,23,42,0.6);
}

.service-row:hover {
    transform: translateY(-4px);
    border-color: rgba(96,165,250,0.8);
}

.service-image img {
    width: 100%;
    border-radius: var(--radius-md);
    object-fit: cover;
}

/* LEFT IMAGE: normal order */
.service-row.left-image {
    grid-template-columns: 1fr 1fr;
}

/* RIGHT IMAGE: reverse order */
.service-row.right-image {
    grid-template-columns: 1fr 1fr;
}

.service-row.right-image .service-image {
    order: 2;
}
.service-row.right-image .service-content {
    order: 1;
}

.service-content h3 {
    margin-top: 0;
    margin-bottom: 0.6rem;
    font-size: 1.4rem;
}

.service-content p {
    color: var(--muted);
    margin-bottom: 1.2rem;
    max-width: 500px;
}

/* Mobile responsiveness */
@media (max-width: 900px) {
    .service-row {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .service-row.right-image .service-image,
    .service-row.right-image .service-content {
        order: unset;
    }

    .service-image img {
        height: 220px;
        object-fit: cover;
        margin-bottom: 1rem;
    }
}

.lang-switcher {
    appearance: none;
    background: rgba(15, 23, 42, 0.75);
    border: 1px solid rgba(55, 65, 81, 0.9);
    color: var(--muted);
    padding: 0.45rem 1.4rem 0.45rem 0.8rem;
    border-radius: 999px;
    font-size: 0.85rem;
    cursor: pointer;
    backdrop-filter: blur(8px);
    transition: border-color var(--transition-fast),
                background var(--transition-fast),
                color var(--transition-fast),
                box-shadow var(--transition-fast);
    position: relative;
}

.lang-switcher::after {
    content: "▾";
    position: absolute;
    right: 0.55rem;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--muted);
    font-size: 0.7rem;
}

.lang-switcher:hover {
    border-color: rgba(96, 165, 250, 0.95);
    color: #e5e7eb;
    background: rgba(17, 24, 39, 0.9);
    box-shadow: 0 4px 14px rgba(56, 189, 248, 0.25);
}

.lang-switcher option {
    background: #020617;
    color: var(--text);
}