/* ========================================
   CelerityIA - Styles
   Couleurs du logo:
   - Bleu marine: #0d2137
   - Bleu cyan: #00b4d8
   - Bleu intermédiaire: #1e5f8a
======================================== */

:root {
    /* Couleurs principales */
    --color-primary-dark: #0d2137;
    --color-primary: #1e5f8a;
    --color-primary-light: #00b4d8;
    --color-accent: #00d4ff;

    /* Couleurs neutres */
    --color-white: #ffffff;
    --color-gray-100: #f8fafc;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
    --gradient-accent: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-accent) 100%);
    --gradient-hero: linear-gradient(180deg, var(--color-primary-dark) 0%, #0a1929 100%);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

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

    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 30px rgba(0, 180, 216, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ========================================
   Navigation
======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    transition: all var(--transition-base);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(13, 33, 55, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--color-white);
    border-radius: 50%;
    padding: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.nav-logo:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(0, 180, 216, 0.3);
}

.nav-logo img {
    height: 40px;
    width: 40px;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--color-white);
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--spacing-xs) 0;
    position: relative;
}

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

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-white);
    transition: all var(--transition-base);
}

/* ========================================
   Hero Section
======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    overflow: hidden;
}

#particles-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: var(--spacing-lg);
    max-width: 800px;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

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

.title-ia {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.2rem, 3vw, 1.5rem);
    color: var(--color-primary-light);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-gray-300);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--color-primary-dark);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(0, 180, 216, 0.5);
}

/* Scroll indicator */
.hero-scroll {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-gray-400);
    font-size: 0.85rem;
    transition: color var(--transition-base);
}

.scroll-indicator:hover {
    color: var(--color-primary-light);
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: rotate(45deg) translateY(0);
    }
    40% {
        transform: rotate(45deg) translateY(10px);
    }
    60% {
        transform: rotate(45deg) translateY(5px);
    }
}

/* ========================================
   Section Titles
======================================== */
.section-title {
    font-size: clamp(2rem, 5vw, 2.5rem);
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-gray-500);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
}

/* ========================================
   Services Section
======================================== */
.services {
    padding: var(--spacing-3xl) 0;
    background: var(--color-gray-100);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.service-card {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.service-icon svg {
    width: 30px;
    height: 30px;
    color: var(--color-white);
}

.service-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.service-description {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.service-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.service-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-gray-600);
    font-size: 0.9rem;
}

.service-features li::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--color-primary-light);
    border-radius: 50%;
}

/* ========================================
   About Section
======================================== */
.about {
    padding: var(--spacing-3xl) 0;
    background: var(--color-white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about .section-title {
    text-align: left;
}

.about-description {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-values {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.value-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--color-gray-100);
    border-radius: var(--radius-md);
}

.value-icon {
    font-size: 1.5rem;
}

.value-text {
    font-weight: 500;
    color: var(--color-primary-dark);
}

/* Tech Stack Visual */
.about-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.tech-stack {
    position: relative;
    width: 300px;
    height: 300px;
}

.tech-orbit {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 2px dashed var(--color-gray-200);
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

.tech-item {
    position: absolute;
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.85rem;
    box-shadow: var(--shadow-lg);
    animation: counter-rotate 20s linear infinite;
}

.tech-item:nth-child(1) { top: -30px; left: 50%; transform: translateX(-50%); }
.tech-item:nth-child(2) { top: 50%; right: -30px; transform: translateY(-50%); }
.tech-item:nth-child(3) { bottom: -30px; left: 50%; transform: translateX(-50%); }
.tech-item:nth-child(4) { top: 50%; left: -30px; transform: translateY(-50%); }

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes counter-rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(-360deg); }
}

.tech-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    background: var(--color-white);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-xl);
    border: 3px solid var(--color-primary-light);
}

.tech-center span:first-child {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-primary-dark);
}

.tech-center span:last-child {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-primary-light);
}

/* ========================================
   Contact Section
======================================== */
.contact {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--color-gray-100) 0%, var(--color-white) 100%);
}

.contact-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--spacing-2xl);
}

.contact-form {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

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

.form-group label {
    display: block;
    font-weight: 500;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    background: var(--color-white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.1);
}

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

.btn-submit {
    width: 100%;
    justify-content: center;
}

.btn-submit svg {
    width: 20px;
    height: 20px;
}

.optional {
    font-weight: 400;
    color: var(--color-gray-400);
    font-size: 0.85rem;
}

.rgpd-notice {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--color-gray-100);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    color: var(--color-gray-500);
    line-height: 1.6;
    border-left: 3px solid var(--color-primary-light);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-card {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
}

.contact-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-sm);
}

.contact-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary-dark);
}

.contact-card h4 {
    font-size: 1rem;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-xs);
}

.contact-card a,
.contact-card p {
    color: var(--color-gray-600);
    font-size: 0.95rem;
}

.contact-card a:hover {
    color: var(--color-primary-light);
}

/* ========================================
   Footer
======================================== */
.footer {
    background: var(--color-primary-dark);
    color: var(--color-gray-300);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white);
}

.footer-logo span {
    color: var(--color-primary-light);
}

.footer-brand p {
    font-size: 0.9rem;
    margin-top: var(--spacing-xs);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--color-gray-400);
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-gray-500);
}

/* ========================================
   Responsive Design
======================================== */
@media (max-width: 992px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .about .section-title {
        text-align: center;
    }

    .about-text {
        text-align: center;
    }

    .about-values {
        justify-content: center;
    }

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

    .contact-info {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }

    .contact-card {
        flex: 1;
        min-width: 200px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: var(--color-primary-dark);
        flex-direction: column;
        padding: var(--spacing-3xl) var(--spacing-lg);
        transition: right var(--transition-base);
        box-shadow: var(--shadow-xl);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .tech-stack {
        width: 250px;
        height: 250px;
    }

    .contact-info {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .about-values {
        grid-template-columns: 1fr;
    }

    .hero-description {
        font-size: 1rem;
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.95rem;
    }
}

/* ========================================
   Animations & Effects
======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Glassmorphism effect for scrolled navbar */
.navbar.scrolled {
    background: rgba(13, 33, 55, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}