/* ==========================================================================
   CT-IA - Styles (v2 - Plus visuel, moins verbeux)
   ========================================================================== */

/* --------------------------------------------------------------------------
   Variables
   -------------------------------------------------------------------------- */
:root {
    /* Colors */
    --color-black: #1a1a1a;
    --color-white: #ffffff;
    --color-accent: #C4A77D;
    --color-accent-dark: #A68B5B;
    --color-gray: #888888;
    --color-gray-dark: #666666;
    --color-gray-light: #f5f5f5;

    /* Typography */
    --font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;

    /* Spacing */
    --section-padding: 100px;
    --section-padding-mobile: 60px;
    --container-max: 1100px;
    --container-padding: 24px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
}

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

html {
    /* smooth scroll géré en JS pour compenser la hauteur de la navbar */
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-white);
    background-color: var(--color-black);
    -webkit-font-smoothing: antialiased;
}

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

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

ul { list-style: none; }

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

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
}

h3 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-medium);
}

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

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

.btn-lg {
    padding: 16px 36px;
    font-size: 1rem;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    background-color: transparent;
    transition: all var(--transition-medium);
}

.navbar.scrolled {
    background-color: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    padding: 12px 0;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    color: var(--color-white);
}

.nav-logo:hover { color: var(--color-white); }

.logo-main {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 300;
    letter-spacing: 4px;
}

.logo-dash { color: var(--color-accent); }

.logo-baseline {
    font-size: 0.55rem;
    font-weight: 400;
    letter-spacing: 2px;
    color: var(--color-gray);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-white);
    transition: color var(--transition-fast);
}

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

.nav-links .btn { margin-left: 20px; }

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-white);
    cursor: pointer;
    padding: 8px;
}

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

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        height: 100dvh; /* meilleur support mobile */
        background-color: var(--color-black);
        flex-direction: column;
        justify-content: center;
        gap: 32px;
        transition: right var(--transition-medium);
        box-shadow: -5px 0 30px rgba(0, 0, 0, 0.5);
    }

    .nav-links.active { right: 0; }
    .nav-links a { font-size: 1.125rem; }
    .nav-links .btn { margin-left: 0; }
    .nav-toggle { display: block; }
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 120px var(--container-padding) 80px;
    position: relative;
    background: var(--color-black);
}

.hero-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    max-width: 550px;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 500;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero-title span {
    color: var(--color-accent);
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray);
    margin-bottom: 2rem;
}

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

.hero-icon {
    width: 280px;
    height: 280px;
    color: var(--color-accent);
    opacity: 0.8;
}

.hero-icon svg {
    width: 100%;
    height: 100%;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.hero-scroll a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    color: var(--color-accent);
    animation: bounce 2s infinite;
}

.hero-scroll svg { width: 32px; height: 32px; }

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

@media (max-width: 900px) {
    .hero-layout {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content { max-width: 100%; }

    .hero-visual { order: -1; }

    .hero-icon {
        width: 180px;
        height: 180px;
    }
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */
.section {
    padding: var(--section-padding) 0;
}

.section-dark {
    background-color: var(--color-black);
    color: var(--color-white);
}

.section-light {
    background-color: var(--color-gray-light);
    color: var(--color-black);
}

.section-light h2,
.section-light h3 {
    color: var(--color-black);
}

@media (max-width: 768px) {
    .section { padding: var(--section-padding-mobile) 0; }
}

/* --------------------------------------------------------------------------
   Methode Section
   -------------------------------------------------------------------------- */
.methode-intro {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.methode-problem {
    font-size: 1rem;
    color: var(--color-gray-dark);
    margin-bottom: 1rem;
}

.methode-intro h2 {
    color: var(--color-black);
}

.methode-steps {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 50px;
}

.step {
    flex: 1;
    max-width: 250px;
    text-align: center;
    padding: 30px 20px;
    background: var(--color-white);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    position: relative;
}

.step-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    border-radius: 50%;
    color: var(--color-white);
}

.step-icon svg {
    width: 28px;
    height: 28px;
}

.step-number {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.step h3 {
    margin-bottom: 8px;
    color: var(--color-black);
}

.step p {
    font-size: 0.9rem;
    color: var(--color-gray-dark);
    margin-bottom: 0;
}

.step-arrow {
    display: flex;
    align-items: center;
    color: var(--color-accent);
    padding-top: 50px;
}

.step-arrow svg {
    width: 24px;
    height: 24px;
}

.methode-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background-color: var(--color-white);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--color-black);
}

.tag svg {
    width: 16px;
    height: 16px;
    color: var(--color-accent);
}

@media (max-width: 768px) {
    .methode-steps {
        flex-direction: column;
        align-items: center;
    }

    .step { max-width: 100%; }

    .step-arrow {
        transform: rotate(90deg);
        padding: 10px 0;
    }
}

/* --------------------------------------------------------------------------
   Stats
   -------------------------------------------------------------------------- */
.section-stats {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    padding: 60px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    color: var(--color-black);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.8rem;
    color: rgba(26, 26, 26, 0.7);
    text-transform: uppercase;
    letter-spacing: 1px;
}

@media (max-width: 640px) {
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

/* --------------------------------------------------------------------------
   Case Study (Compact)
   -------------------------------------------------------------------------- */
.case-compact {
    max-width: 800px;
    margin: 0 auto;
}

.case-header {
    text-align: center;
    margin-bottom: 40px;
}

.case-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.case-header h2 {
    margin-bottom: 8px;
}

.case-type {
    color: var(--color-gray);
    margin-bottom: 0;
}

.case-metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.metric {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.metric-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(196, 167, 125, 0.15);
    border-radius: 10px;
    color: var(--color-accent);
}

.metric-icon svg {
    width: 24px;
    height: 24px;
}

.metric-content {
    flex: 1;
}

.metric-label {
    display: block;
    font-size: 0.8rem;
    color: var(--color-gray);
    margin-bottom: 4px;
}

.metric-value {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-white);
}

.metric-value svg {
    width: 16px;
    height: 16px;
    color: var(--color-accent);
}

.case-quote {
    padding: 30px;
    background: linear-gradient(135deg, rgba(196, 167, 125, 0.1) 0%, transparent 100%);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 12px 12px 0;
}

.case-quote p {
    font-size: 1.1rem;
    font-style: italic;
    margin-bottom: 12px;
}

.case-quote cite {
    font-style: normal;
    font-size: 0.9rem;
    color: var(--color-gray);
}

@media (max-width: 640px) {
    .case-metrics {
        grid-template-columns: 1fr;
    }
}

/* --------------------------------------------------------------------------
   About (Compact)
   -------------------------------------------------------------------------- */
.about-compact {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 60px;
    align-items: center;
    max-width: 900px;
    margin: 0 auto;
}

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

.about-icon {
    width: 150px;
    height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border-radius: 50%;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    color: var(--color-accent);
}

.about-icon svg {
    width: 60px;
    height: 60px;
}

.about-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.about-content h2 {
    margin-bottom: 16px;
}

.about-content > p {
    color: var(--color-gray-dark);
    margin-bottom: 24px;
}

.about-points {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.point {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    color: var(--color-black);
}

.point svg {
    width: 20px;
    height: 20px;
    color: var(--color-accent);
}

@media (max-width: 768px) {
    .about-compact {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .about-icon {
        width: 120px;
        height: 120px;
    }

    .about-icon svg {
        width: 48px;
        height: 48px;
    }

    .about-points {
        align-items: center;
    }
}

/* --------------------------------------------------------------------------
   CTA Section
   -------------------------------------------------------------------------- */
.section-cta {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    text-align: center;
    padding: 80px 0;
}

.cta-content h2 {
    color: var(--color-black);
    margin-bottom: 24px;
}

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

.section-cta .btn-primary:hover {
    background-color: var(--color-white);
    color: var(--color-black);
}

/* --------------------------------------------------------------------------
   Contact
   -------------------------------------------------------------------------- */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info h2 {
    margin-bottom: 24px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.contact-item svg {
    width: 20px;
    height: 20px;
    color: var(--color-accent);
}

.contact-item a,
.contact-item span {
    color: var(--color-white);
}

.contact-item a:hover {
    color: var(--color-accent);
}

.contact-note {
    font-size: 0.875rem;
    color: var(--color-gray);
}

/* Form */
.contact-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group-full {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-gray);
}

.form-group input,
.form-group textarea {
    padding: 14px;
    font-family: var(--font-family);
    font-size: 1rem;
    color: var(--color-white);
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-gray-dark);
}

.contact-form .btn {
    grid-column: 1 / -1;
    justify-self: start;
}

.form-status {
    grid-column: 1 / -1;
    padding: 14px;
    border-radius: 8px;
    display: none;
}

.form-status.success {
    display: block;
    background-color: rgba(76, 175, 80, 0.1);
    border: 1px solid rgba(76, 175, 80, 0.3);
    color: #4caf50;
}

.form-status.error {
    display: block;
    background-color: rgba(244, 67, 54, 0.1);
    border: 1px solid rgba(244, 67, 54, 0.3);
    color: #f44336;
}

@media (max-width: 768px) {
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-form {
        grid-template-columns: 1fr;
    }
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    padding: 50px 0 30px;
    background-color: #0d0d0d;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.25rem;
    font-weight: 300;
    letter-spacing: 2px;
    color: var(--color-white);
    margin-bottom: 6px;
}

.footer-tagline {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-gray);
    margin-bottom: 2px;
}

.footer-entity {
    font-size: 0.7rem;
    color: var(--color-gray-dark);
    margin-bottom: 0;
}

.footer-links {
    display: flex;
    gap: 16px;
}

.footer-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--color-white);
    transition: all var(--transition-fast);
}

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

.footer-links svg {
    width: 18px;
    height: 18px;
}

.footer-bottom {
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--color-gray-dark);
    margin-bottom: 0;
}

@media (max-width: 640px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 24px;
    }
}

/* --------------------------------------------------------------------------
   Screen-reader only (SEO + a11y)
   -------------------------------------------------------------------------- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Overlay for mobile menu */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-medium);
    z-index: 999;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* --------------------------------------------------------------------------
   Focus styles (a11y)
   -------------------------------------------------------------------------- */
a:focus-visible,
.btn:focus-visible,
.nav-toggle:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Reduced motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .fade-in {
        opacity: 1;
        transform: none;
    }
}