/* ===========================================
   ECOS - Styles principaux
   =========================================== */

:root {
    --primary: #1a56db;
    --primary-dark: #1e40af;
    --primary-light: #dbeafe;
    --secondary: #0f172a;
    --accent: #10b981;
    --accent-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
}

/* ===========================================
   Navigation
   =========================================== */
nav {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.logo-text {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.02em;
}

.logo-tagline {
    font-size: 0.7rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-left: 0.75rem;
    padding-left: 0.75rem;
    border-left: 1px solid var(--gray-300);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary);
}

/* ===========================================
   Boutons
   =========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--gray-500);
}

.btn-outline:hover {
    border-color: var(--white);
    background: rgba(255,255,255,0.1);
}

/* ===========================================
   Sections
   =========================================== */
section {
    padding: 5rem 2rem;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3rem;
}

.section-header h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--gray-500);
}

/* ===========================================
   Badges
   =========================================== */
.badge {
    display: inline-block;
    padding: 0.35rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.badge-primary {
    background: var(--primary-light);
    color: var(--primary);
}

.badge-accent {
    background: var(--accent-light);
    color: var(--accent);
}

.badge-warning {
    background: var(--warning-light);
    color: var(--warning);
}

/* ===========================================
   Footer
   =========================================== */
footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: 4rem 2rem 2rem;
}

.footer-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
}

.footer-brand .logo-text {
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
}

.footer-col h5 {
    color: var(--white);
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 0.5rem;
}

.footer-col a {
    color: var(--gray-400);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.footer-col a:hover {
    color: var(--white);
}

.footer-bottom {
    max-width: 1200px;
    margin: 3rem auto 0;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-800);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.85rem;
}

.footer-bottom a {
    color: var(--gray-400);
    text-decoration: none;
}

.footer-bottom a:hover {
    color: var(--white);
}

/* ===========================================
   Responsive
   =========================================== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

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

    section {
        padding: 3rem 1rem;
    }

    .section-header h2 {
        font-size: 1.75rem;
    }
}