/* ==========================================================================
   Superpose LLC — Feuille de style institutionnelle
   ========================================================================== */

/* Reset & Base
   ========================================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-primary: #1a365d;
    --color-primary-dark: #0f2544;
    --color-secondary: #2c5282;
    --color-text: #1a202c;
    --color-text-muted: #4a5568;
    --color-text-light: #718096;
    --color-border: #e2e8f0;
    --color-background: #ffffff;
    --color-background-alt: #f7fafc;
    --color-background-dark: #1a202c;

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
    --font-serif: Georgia, "Times New Roman", Times, serif;

    --container-width: 1180px;
    --container-padding: 1.5rem;

    --transition: 200ms ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    color: var(--color-primary);
    letter-spacing: -0.01em;
}

h1 {
    font-size: 2.25rem;
    margin-bottom: 1.25rem;
}

h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1rem;
}

ul, ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Layout
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.container-narrow {
    max-width: 860px;
}

/* Header
   ========================================================================== */
.site-header {
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.site-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.02em;
    text-decoration: none;
}

.site-logo:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.site-logo img {
    height: 32px;
    width: auto;
    display: block;
}

.site-logo-text {
    display: inline-block;
    line-height: 1;
    font-weight: 700;
    color: var(--color-primary);
}

.site-logo-text span {
    font-weight: 400;
    color: var(--color-text-muted);
    margin-left: 0.25rem;
}

.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 2rem;
}

.main-nav li {
    margin: 0;
}

.main-nav a {
    color: var(--color-text);
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition), color var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    text-decoration: none;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--color-primary);
}

.nav-toggle svg {
    width: 24px;
    height: 24px;
}

/* Hero
   ========================================================================== */
.hero {
    background-color: var(--color-background-alt);
    padding: 5rem 0;
    border-bottom: 1px solid var(--color-border);
}

.hero-content {
    max-width: 780px;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--color-primary);
}

.hero p.lead {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 2rem;
}

/* Page header (pages intérieures)
   ========================================================================== */
.page-header {
    background-color: var(--color-background-alt);
    padding: 3.5rem 0;
    border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.page-header .breadcrumb {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.page-header .breadcrumb a {
    color: var(--color-text-muted);
}

/* Sections
   ========================================================================== */
.section {
    padding: 4.5rem 0;
}

.section-alt {
    background-color: var(--color-background-alt);
}

.section-header {
    max-width: 720px;
    margin-bottom: 3rem;
}

.section-header h2 {
    margin-bottom: 0.75rem;
}

.section-header p {
    color: var(--color-text-muted);
    font-size: 1.0625rem;
}

.section-title-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-secondary);
    margin-bottom: 0.75rem;
}

/* Buttons
   ========================================================================== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    line-height: 1.4;
    text-decoration: none;
    text-align: center;
    border: 1px solid transparent;
    border-radius: 3px;
    cursor: pointer;
    transition: all var(--transition);
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: #ffffff;
    text-decoration: none;
}

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: #ffffff;
    text-decoration: none;
}

/* Cards & grids
   ========================================================================== */
.grid {
    display: grid;
    gap: 1.75rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 1.75rem;
    transition: border-color var(--transition);
}

.card:hover {
    border-color: var(--color-secondary);
}

.card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.125rem;
}

.card p {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    margin-bottom: 0;
}

.card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background-color: var(--color-background-alt);
    border-radius: 4px;
    color: var(--color-primary);
    margin-bottom: 1.25rem;
}

.card-icon svg {
    width: 22px;
    height: 22px;
}

/* Value blocks (valeurs / engagements)
   ========================================================================== */
.value-block {
    padding-left: 1.25rem;
    border-left: 2px solid var(--color-primary);
}

.value-block h3 {
    font-size: 1.0625rem;
    margin-bottom: 0.5rem;
}

.value-block p {
    color: var(--color-text-muted);
    margin-bottom: 0;
    font-size: 0.9375rem;
}

/* Content blocks
   ========================================================================== */
.content-block {
    margin-bottom: 2.5rem;
}

.content-block:last-child {
    margin-bottom: 0;
}

.content-block h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-border);
}

.content-block h3 {
    margin-top: 1.5rem;
    font-size: 1.125rem;
}

.content-block p,
.content-block li {
    color: var(--color-text);
}

/* Legal / definition lists
   ========================================================================== */
.legal-info {
    background-color: var(--color-background-alt);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 1.75rem;
    margin-bottom: 2rem;
}

.legal-info dl {
    display: grid;
    grid-template-columns: minmax(200px, 280px) 1fr;
    gap: 0.75rem 1.5rem;
    margin: 0;
}

.legal-info dt {
    font-weight: 600;
    color: var(--color-primary);
    font-size: 0.9375rem;
}

.legal-info dd {
    color: var(--color-text);
    font-size: 0.9375rem;
    margin: 0;
}

@media (max-width: 640px) {
    .legal-info dl {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }

    .legal-info dd {
        margin-bottom: 0.75rem;
        padding-bottom: 0.75rem;
        border-bottom: 1px solid var(--color-border);
    }

    .legal-info dd:last-child {
        border-bottom: none;
        margin-bottom: 0;
    }
}

/* Forms
   ========================================================================== */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 0.375rem;
}

.form-group .required {
    color: #c53030;
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 0.9375rem;
    font-family: inherit;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: 3px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(44, 82, 130, 0.12);
}

textarea.form-control {
    min-height: 140px;
    resize: vertical;
}

.form-check {
    display: flex;
    align-items: flex-start;
    gap: 0.625rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.form-check input[type="checkbox"] {
    margin-top: 0.25rem;
    flex-shrink: 0;
}

.form-note {
    font-size: 0.8125rem;
    color: var(--color-text-light);
    margin-top: 0.375rem;
}

/* Contact info block
   ========================================================================== */
.contact-info {
    display: grid;
    gap: 1.25rem;
}

.contact-info-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.contact-info-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-background-alt);
    border-radius: 4px;
    color: var(--color-primary);
}

.contact-info-icon svg {
    width: 20px;
    height: 20px;
}

.contact-info-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-light);
    margin-bottom: 0.125rem;
}

.contact-info-value {
    color: var(--color-text);
    font-size: 0.9375rem;
    font-weight: 500;
}

.contact-info-value a {
    color: var(--color-text);
}

/* CTA section
   ========================================================================== */
.cta-section {
    background-color: var(--color-primary);
    color: #ffffff;
    padding: 3.5rem 0;
}

.cta-section h2 {
    color: #ffffff;
    margin-bottom: 1rem;
    font-size: 1.625rem;
}

.cta-section p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.0625rem;
    margin-bottom: 1.75rem;
    max-width: 620px;
}

.cta-section .btn-outline {
    color: #ffffff;
    border-color: #ffffff;
}

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

/* Footer
   ========================================================================== */
.site-footer {
    background-color: var(--color-background-dark);
    color: #cbd5e0;
    padding: 3.5rem 0 1.5rem;
    font-size: 0.875rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.2fr;
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}

@media (max-width: 860px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 520px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

.footer-brand {
    color: #ffffff;
    font-size: 1.0625rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: 0.02em;
}

.footer-description {
    color: #a0aec0;
    font-size: 0.875rem;
    line-height: 1.65;
}

.footer-heading {
    color: #ffffff;
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 1rem;
}

.footer-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

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

.footer-list a {
    color: #a0aec0;
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition);
}

.footer-list a:hover {
    color: #ffffff;
    text-decoration: none;
}

.footer-list address {
    font-style: normal;
    color: #a0aec0;
    font-size: 0.875rem;
    line-height: 1.65;
}

.footer-bottom {
    padding-top: 1.5rem;
    border-top: 1px solid #2d3748;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-copyright {
    color: #718096;
    font-size: 0.8125rem;
    margin: 0;
}

.footer-legal-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    padding: 0;
    margin: 0;
    flex-wrap: wrap;
}

.footer-legal-links a {
    color: #718096;
    font-size: 0.8125rem;
    text-decoration: none;
}

.footer-legal-links a:hover {
    color: #ffffff;
}

/* Responsive
   ========================================================================== */
@media (max-width: 860px) {
    h1 { font-size: 1.875rem; }
    .hero h1 { font-size: 2rem; }
    .hero { padding: 3.5rem 0; }
    .section { padding: 3rem 0; }
    .page-header { padding: 2.5rem 0; }

    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-background);
        border-bottom: 1px solid var(--color-border);
        padding: 1rem var(--container-padding);
    }

    .main-nav.open {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 0.25rem;
    }

    .main-nav a {
        display: block;
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--color-border);
    }

    .main-nav li:last-child a {
        border-bottom: none;
    }

    .nav-toggle {
        display: block;
    }

    .site-header {
        position: relative;
    }
}

/* Focus visibility for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: #ffffff;
    padding: 0.5rem 1rem;
    z-index: 999;
    text-decoration: none;
}

.skip-link:focus {
    top: 0;
    color: #ffffff;
}