/* ======================================
   VARIABLES & RESET
   ====================================== */

:root {
    /* Couleurs */
    --primary: #1e3a8a;
    --secondary: #3b82f6;
    --accent: #f97316;
    --dark: #1f2937;
    --light: #f9fafb;
    --border: #e5e7eb;
    --success: #10b981;

    /* Typographie */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Courier New', monospace;

    /* Espacements */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Tailles de texte */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;

    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;

    /* Ombres */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--dark);
    background-color: #ffffff;
}

/* ======================================
   LAYOUT DE BASE
   ====================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ======================================
   HEADER & NAVIGATION
   ====================================== */

.header {
    background: #ffffff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--primary);
    font-weight: 700;
}

.logo-text {
    font-size: var(--text-2xl);
    letter-spacing: -0.5px;
}

.logo-subtitle {
    font-size: var(--text-xs);
    color: var(--accent);
    margin-left: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary);
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: var(--transition);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.nav-link:hover {
    color: var(--primary);
    background-color: rgba(30, 58, 138, 0.05);
}

.nav-link-cta {
    background-color: var(--primary);
    color: #ffffff;
    padding: var(--spacing-xs) var(--spacing-md);
}

.nav-link-cta:hover {
    background-color: #1e3a8a;
    box-shadow: var(--shadow-md);
}

/* ======================================
   BOUTONS
   ====================================== */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    text-align: center;
    font-family: var(--font-primary);
}

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

.btn-primary:hover {
    background-color: #1e3a8a;
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background-color: var(--primary);
    color: #ffffff;
}

.btn-outline {
    background-color: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
    padding: calc(var(--spacing-sm) - 2px) calc(var(--spacing-md) - 2px);
}

.btn-outline:hover {
    background-color: var(--primary);
    color: #ffffff;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--text-lg);
}

/* ======================================
   TYPOGRAPHIE
   ====================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--dark);
}

h1 {
    font-size: var(--text-4xl);
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: var(--text-3xl);
    margin-bottom: var(--spacing-lg);
}

h3 {
    margin-bottom: var(--spacing-md);
}

p {
    margin-bottom: var(--spacing-md);
    color: #555;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--secondary);
}

/* ======================================
   SECTIONS
   ====================================== */

section {
    padding: var(--spacing-2xl) 0;
}

section:nth-child(even) {
    background-color: var(--light);
}

/* ======================================
   GRILLE RESPONSIVE
   ====================================== */

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

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

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

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* ======================================
   FORMULAIRES
   ====================================== */

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: var(--text-base);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-group.checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.form-group.checkbox input {
    width: auto;
    margin: 0;
}

.form-group.checkbox label {
    margin: 0;
}

.form-note {
    font-size: var(--text-sm);
    color: #999;
}

/* ======================================
   FOOTER
   ====================================== */

.footer {
    background-color: var(--dark);
    color: #ffffff;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3 {
    color: #ffffff;
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: #ccc;
    margin-bottom: var(--spacing-sm);
}

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

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: #ccc;
}

.footer-section a:hover {
    color: var(--accent);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    color: #ffffff;
    font-weight: 600;
    transition: var(--transition);
}

.social-link:hover {
    background-color: var(--accent);
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: #ccc;
}

/* ======================================
   RESPONSIVE DESIGN
   ====================================== */

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    h1 {
        font-size: var(--text-2xl);
    }

    h2 {
        font-size: var(--text-2xl);
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        gap: 0;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }

    .nav-menu.active {
        max-height: 400px;
    }

    .nav-link {
        display: block;
        padding: var(--spacing-md);
        border-radius: 0;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    section {
        padding: var(--spacing-xl) 0;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 1.5rem;
        --text-4xl: 1.875rem;
        --text-3xl: 1.5rem;
    }

    h1 {
        font-size: var(--text-xl);
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}