/* =====================
   Variables & Palette
   ===================== */
:root {
    --color-primary: #2563EB;
    --color-primary-light: #3B82F6;
    --color-primary-dark: #1D4ED8;
    --color-secondary: #64748B;
    --color-accent: #F59E0B;
    --color-accent-light: #F59E0B;
    --color-accent-dark: #D97706;
    --color-background: #F8FAFC;
    --color-text: #1E293B;
    --color-text-light: #64748B;
    --color-white: #FFFFFF;
    --color-gray-100: #F1F5F9;
    --color-gray-200: #E2E8F0;
    --color-gray-300: #CBD5E1;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(37,99,235,0.08);
    --shadow-lg: 0 10px 24px rgba(37,99,235,0.10);
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 2rem;
    --font-primary: 'Inter', sans-serif;
    --font-secondary: 'Roboto', sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

/* =====================
   Reset & Base Styles
   ===================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
    font-size: 16px;
}
body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background: var(--color-background);
    line-height: 1.6;
    overflow-x: hidden;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* =====================
   Typography
   ===================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}
h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}
h2 {
    font-size: 2.2rem;
    margin-bottom: 2.5rem;
    text-align: center;
}
h3 {
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
}
p {
    margin-bottom: 1rem;
    color: var(--color-text-light);
}

/* =====================
   Header Premium
   ===================== */
.premium-header {
    position: fixed;
    top: 0; left: 0; width: 100%;
    background: transparent;
    z-index: 1000;
    transition: background 0.3s, box-shadow 0.3s;
    box-shadow: none;
}
.premium-header.scrolled {
    background: var(--color-white);
    box-shadow: var(--shadow-md);
}
.premium-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.2rem 1.5rem;
}
.logo {
    font-size: 1.7rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -1px;
}
.logo .accent {
    color: var(--color-accent);
}
.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}
.nav-links a {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color 0.2s;
}
.nav-links a::after {
    content: '';
    position: absolute;
    left: 0; bottom: -4px;
    width: 0; height: 2px;
    background: var(--color-primary);
    transition: width 0.3s;
}
.nav-links a:hover,
.nav-links a.active {
    color: var(--color-primary);
}
.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}
.burger-menu {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
}
.burger-menu span {
    display: block;
    width: 26px;
    height: 3px;
    background: var(--color-text);
    margin: 5px 0;
    border-radius: 2px;
    transition: var(--transition-smooth);
}

/* =====================
   Hero Premium
   ===================== */
.premium-hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    position: relative;
    background-size: cover;
    background-position: center;
    color: var(--color-white);
    padding-top: 6.5rem;
    padding-bottom: 3rem;
    overflow: hidden;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(30,41,59,0.7) 60%, rgba(37,99,235,0.5) 100%);
    z-index: 1;
}
.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    z-index: 2;
    gap: 3rem;
}
.hero-content {
    flex: 1 1 60%;
    z-index: 2;
    text-align: left;
    max-width: 600px;
}
.hero-content h1 {
    color: var(--color-white);
    font-size: 3rem;
    margin-bottom: 1rem;
}
.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 2.2rem;
    color: #e0e7ef;
    font-weight: 400;
}
.hero-cta {
    display: flex;
    gap: 1.2rem;
    margin-bottom: 2.5rem;
}
.hero-img {
    flex: 1 1 40%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.hero-img img {
    width: 340px;
    height: 340px;
    object-fit: cover;
    border-radius: 2rem;
    box-shadow: var(--shadow-lg);
    border: 6px solid var(--color-white);
    background: var(--color-white);
}

/* =====================
   Stats Premium
   ===================== */
.stats-row {
    display: flex;
    gap: 2rem;
    margin-top: 2.5rem;
}
.stat-card {
    background: var(--color-white);
    color: var(--color-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: 1.5rem 2.2rem;
    text-align: center;
    min-width: 140px;
    transition: transform 0.2s, box-shadow 0.2s;
    font-weight: 600;
}
.stat-card:hover {
    transform: translateY(-6px) scale(1.04);
    box-shadow: var(--shadow-lg);
}
.stat-number {
    font-size: 2.1rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.3rem;
    display: block;
}
.stat-label {
    color: var(--color-secondary);
    font-size: 1rem;
    font-weight: 500;
}

/* =====================
   Partenaires
   ===================== */
.partners {
    background: var(--color-white);
    padding: 2.5rem 0 2rem;
}
.partners-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3.5rem;
    flex-wrap: wrap;
}
.partner-logo {
    height: 38px;
    opacity: 0.7;
    filter: grayscale(1);
    transition: opacity 0.2s, filter 0.2s;
}
.partner-logo:hover {
    opacity: 1;
    filter: grayscale(0);
}

/* =====================
   Avantages (Features)
   ===================== */
.premium-features {
    background: var(--color-gray-100);
    padding: 5rem 0 5rem;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2.5rem;
}
.feature-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 2.2rem 1.5rem 2rem 1.5rem;
    text-align: center;
    transition: var(--transition-smooth);
    position: relative;
}
.feature-card:hover {
    transform: translateY(-8px) scale(1.03);
    box-shadow: var(--shadow-lg);
}
.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1.2rem auto;
    color: var(--color-primary);
    font-size: 2.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-gray-100);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

/* =====================
   Expertise / Timeline
   ===================== */
.premium-experience {
    background: var(--color-white);
    padding: 5rem 0 5rem;
}
.experience-container {
    display: flex;
    align-items: center;
    gap: 3.5rem;
    flex-wrap: wrap;
}
.experience-img {
    flex: 1 1 40%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.experience-img img {
    width: 320px;
    height: 320px;
    object-fit: cover;
    border-radius: 2rem;
    box-shadow: var(--shadow-lg);
    border: 6px solid var(--color-gray-100);
    background: var(--color-gray-100);
}
.experience-content {
    flex: 1 1 60%;
    min-width: 300px;
}
.timeline {
    margin-top: 2.2rem;
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}
.timeline-item {
    background: var(--color-gray-100);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 1.2rem 1.5rem;
    min-width: 140px;
    text-align: center;
    flex: 1 1 120px;
}
.timeline-year {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.3rem;
    display: block;
}
.timeline-desc {
    color: var(--color-secondary);
    font-size: 1rem;
}

/* =====================
   Témoignages Premium
   ===================== */
.premium-testimonials {
    background: var(--color-gray-100);
    padding: 5rem 0 5rem;
}
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}
.testimonial-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 2.2rem 1.5rem 2rem 1.5rem;
    transition: var(--transition-smooth);
    position: relative;
}
.testimonial-card:hover {
    transform: translateY(-8px) scale(1.03);
    box-shadow: var(--shadow-lg);
}
.testimonial-content {
    margin-bottom: 1.5rem;
    position: relative;
}
.testimonial-content i {
    color: var(--color-accent);
    font-size: 1.5rem;
    margin-bottom: 0.7rem;
}
.testimonial-content p {
    font-style: italic;
    color: var(--color-text-light);
}
.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.testimonial-author img {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-primary-light);
}
.author-info h4 {
    margin-bottom: 0.2rem;
    font-size: 1rem;
    color: var(--color-primary);
}
.author-info p {
    font-size: 0.95rem;
    color: var(--color-secondary);
    margin: 0;
}

/* =====================
   CTA Premium
   ===================== */
.premium-cta {
    background: linear-gradient(120deg, var(--color-primary) 60%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    text-align: center;
    padding: 5rem 0 5rem;
    border-radius: 2rem 2rem 0 0;
}
.premium-cta h2 {
    color: var(--color-white);
    margin-bottom: 1.2rem;
}
.premium-cta p {
    margin-bottom: 2.2rem;
    color: #e0e7ef;
}

/* =====================
   Footer Premium
   ===================== */
.premium-footer {
    background: #1e293b;
    color: #fff;
    padding: 4rem 0 2rem;
}
.footer-grid {
    display: flex;
    gap: 3rem;
    justify-content: space-between;
    flex-wrap: wrap;
}
.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}
.footer-logo .accent {
    color: var(--color-accent);
}
.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}
.social-links a {
    color: #fff;
    opacity: 0.8;
    transition: var(--transition-smooth);
    font-size: 1.25rem;
}
.social-links a:hover {
    opacity: 1;
    transform: translateY(-2px);
}
.footer-links ul {
    list-style: none;
}
.footer-links a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.2s;
    display: block;
    margin-bottom: 0.5rem;
}
.footer-links a:hover {
    color: #fff;
}
.newsletter-form {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}
.newsletter-form input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    background: var(--color-gray-100);
    color: var(--color-text);
}
.newsletter-form input:focus {
    outline: none;
    border-color: var(--color-primary);
}
.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #cbd5e1;
    font-size: 0.95rem;
}

/* =====================
   Boutons Premium
   ===================== */
.btn {
    display: inline-block;
    padding: 0.85rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
    font-family: var(--font-primary);
    font-size: 1rem;
    box-shadow: var(--shadow-sm);
}
.btn-primary {
    background: var(--color-accent);
    color: var(--color-white);
}
.btn-primary:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px) scale(1.04);
    box-shadow: var(--shadow-md);
}
.btn-secondary {
    background: var(--color-white);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}
.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px) scale(1.04);
    box-shadow: var(--shadow-md);
}
.btn-large {
    padding: 1.1rem 2.5rem;
    font-size: 1.1rem;
}

/* =====================
   Responsive Design
   ===================== */
@media (max-width: 1100px) {
    .container { max-width: 98vw; }
    .hero-img img, .experience-img img { width: 260px; height: 260px; }
}
@media (max-width: 900px) {
    .hero-container, .experience-container {
        flex-direction: column;
        gap: 2.5rem;
        text-align: center;
    }
    .hero-content, .experience-content {
        max-width: 100%;
        text-align: center;
    }
    .hero-img, .experience-img {
        justify-content: center;
    }
    .stats-row {
        flex-direction: column;
        gap: 1.2rem;
        align-items: center;
    }
}
@media (max-width: 768px) {
    html { font-size: 15px; }
    .premium-header .container { flex-direction: row; padding: 0.8rem 1rem; }
    .nav-links {
        display: none;
        position: absolute;
        top: 100%; left: 0; width: 100vw;
        background: var(--color-white);
        flex-direction: column;
        align-items: center;
        gap: 1.2rem;
        box-shadow: var(--shadow-md);
        padding: 1.5rem 0;
        z-index: 1001;
    }
    .nav-links.active { display: flex; }
    .burger-menu { display: block; }
    .footer-grid { flex-direction: column; gap: 2rem; }
    .newsletter-form { flex-direction: column; }
}
@media (max-width: 500px) {
    html { font-size: 14px; }
    .hero-img img, .experience-img img { width: 180px; height: 180px; }
    .premium-hero, .premium-experience, .premium-features, .premium-testimonials, .premium-cta {
        padding-left: 0.5rem; padding-right: 0.5rem;
    }
}

/* =====================
   Animations & Apparition
   ===================== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
.fade-in {
    opacity: 0;
    animation: fadeInUp 0.9s cubic-bezier(0.4,0,0.2,1) forwards;
}

/* =====================
   Accessibilité
   ===================== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}