/* ===================================
   Kirago - Design System
   Style sobre, moderne et haut de gamme
   =================================== */

:root {
    /* Palette - Bleu profond et marine avec accent bleu */
    --color-navy: #0A2540;
    --color-navy-light: #1A4F7A;
    --color-navy-lighter: #2D6BA8;
    --color-white: #FFFFFF;
    --color-off-white: #F8FAFC;
    --color-accent: #3B82F6;
    --color-accent-hover: #2563EB;
    --color-gray-dark: #1E293B;
    --color-gray: #64748B;
    --color-gray-light: #94A3B8;
    --color-border: #E2E8F0;

    /* Typographie */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --font-size-xs: 0.875rem;
    --font-size-sm: 1rem;
    --font-size-base: 1.125rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 3rem;
    --font-size-4xl: 4rem;

    /* Espacements */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-navy);
    background-color: var(--color-white);
    min-height: 100vh;
}

img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
}

input, button, textarea, select {
    font: inherit;
    color: inherit;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: transform var(--transition-base);
}

.navbar.hidden {
    transform: translateY(-100%);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    text-decoration: none;
    font-family: var(--font-display);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-navy);
    letter-spacing: -0.02em;
}

.logo-text {
    color: var(--color-navy);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: 1001;
}

.mobile-menu-btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.hamburger {
    width: 24px;
    height: 2px;
    background: var(--color-navy);
    position: relative;
    transition: background var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-navy);
    left: 0;
    transition: transform var(--transition-base);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger {
    background: transparent;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger::before {
    transform: rotate(45deg);
    top: 0;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger::after {
    transform: rotate(-45deg);
    top: 0;
}

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

.nav-link {
    text-decoration: none;
    color: var(--color-gray);
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-navy);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-off-white) 0%, var(--color-white) 100%);
    padding: 120px var(--spacing-lg) var(--spacing-2xl);
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    animation: fadeUp 600ms ease;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(var(--font-size-3xl), 8vw, var(--font-size-4xl));
    font-weight: 700;
    color: var(--color-navy);
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: clamp(var(--font-size-lg), 3vw, var(--font-size-xl));
    color: var(--color-gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-2xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-decoration: none;
    border-radius: 6px;
    transition: all var(--transition-base);
    gap: var(--spacing-sm);
}

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

.btn-primary:hover {
    background: var(--color-navy-light);
    border-color: var(--color-navy-light);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(10, 37, 64, 0.15);
}

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

.btn-secondary:hover {
    background: var(--color-navy);
    color: var(--color-white);
    transform: translateY(-2px);
}

/* Section */
.section {
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-4xl));
    font-weight: 700;
    color: var(--color-navy);
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    letter-spacing: -0.02em;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(10, 37, 64, 0.08);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-off-white);
    border-radius: 8px;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-display);
}

.feature-description {
    color: var(--color-gray);
    line-height: 1.7;
}

/* Services */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.service-card {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.service-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(10, 37, 64, 0.08);
}

.service-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-off-white);
    border-radius: 8px;
    color: var(--color-navy-light);
    margin-bottom: var(--spacing-md);
}

.service-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-display);
}

.service-description {
    color: var(--color-gray);
    line-height: 1.7;
}

/* About */
.about {
    background: var(--color-off-white);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text {
    margin-bottom: var(--spacing-2xl);
}

.about-paragraph {
    font-size: var(--font-size-lg);
    color: var(--color-gray-dark);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.about-values {
    margin-bottom: var(--spacing-2xl);
}

.about-values-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-display);
}

.values-list {
    list-style: none;
}

.values-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    font-size: var(--font-size-base);
    color: var(--color-gray-dark);
}

.values-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-size: var(--font-size-2xl);
    line-height: 1;
}

.about-team {
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

/* CTA */
.cta {
    background: var(--color-navy);
    color: var(--color-white);
}

.cta .section-title {
    color: var(--color-white);
}

.cta .cta-text {
    color: rgba(255, 255, 255, 0.8);
}

.cta-title {
    font-family: var(--font-display);
    font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-4xl));
    font-weight: 700;
    color: var(--color-white);
    text-align: center;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.cta-text {
    font-size: var(--font-size-lg);
    color: var(--color-gray);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

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

.cta .btn-primary:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

/* Footer */
.footer {
    background: var(--color-off-white);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-title {
    font-family: var(--font-display);
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: var(--spacing-md);
}

.footer-description {
    color: var(--color-gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

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

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-gray);
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--color-navy);
    border-color: var(--color-navy);
    color: var(--color-white);
    transform: translateY(-2px);
}

.footer-links {
    list-style: none;
}

.footer-link {
    display: block;
    color: var(--color-gray);
    text-decoration: none;
    padding: var(--spacing-sm) 0;
    transition: color var(--transition-fast);
}

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

.contact-info {
    list-style: none;
}

.contact-info li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    color: var(--color-gray);
    padding: var(--spacing-sm) 0;
}

.contact-info svg {
    flex-shrink: 0;
    margin-top: 3px;
    color: var(--color-accent);
}

.contact-info span {
    line-height: 1.6;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    color: var(--color-gray);
    font-size: var(--font-size-sm);
}

/* Animations */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 600ms ease, transform 600ms ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .services-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .hero-title {
        font-size: clamp(var(--font-size-2xl), 6vw, var(--font-size-3xl));
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-3xl: 4rem;
    }

    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-white);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--spacing-xl);
        transform: translateX(100%);
        transition: transform var(--transition-base);
    }

    .nav-links.active {
        transform: translateX(0);
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero {
        padding: 100px var(--spacing-md) var(--spacing-xl);
    }

    .hero-title {
        margin-bottom: var(--spacing-md);
    }

    .hero-subtitle {
        margin-bottom: var(--spacing-lg);
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .features-grid,
    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .about-content {
        padding: 0 var(--spacing-md);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

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

@media (max-width: 480px) {
    :root {
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

    .footer-description {
        font-size: var(--font-size-sm);
    }

    .contact-info li {
        font-size: var(--font-size-sm);
    }
}

/* Focus styles for accessibility */
*: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;
    }
}