/* CHARTE GRAPHIQUE & VARIABLES */
:root {
    /* PALETTE BLEU & ORANGE CLAIR */
    --primary-color: #1c5ebb; /* Bleu professionnel solide */
    --primary-dark: #134490;  /* Version plus foncée pour les hovers */
    
    --accent-color: #ffab4c;  /* Orange clair / Abricot chaleureux */
    --accent-dark: #e6933a;   /* Version plus foncée pour les hovers */

    --bright-blue-color: #4dabf7; /* Bleu ciel lumineux (remplace l'ancien Teal) */
    
    --bg-light: #f8f9fa;
    --text-muted: #6c757d;
    --border-radius-lg: 16px;
    --navbar-height: 80px;

    /* OMBRES PRO */
    --box-shadow-frame: 0 12px 24px -6px rgba(0, 0, 0, 0.1), 0 4px 8px -4px rgba(0,0,0,0.06);
    --box-shadow-hover: 0 25px 50px -12px rgba(28, 94, 187, 0.25); 
}

/* BASE STYLES */
body {
    font-family: 'Inter', sans-serif;
    color: #333;
    line-height: 1.7;
    padding-top: var(--navbar-height);
}

/* UTILITY CLASSES */
.text-primary { color: var(--primary-color) !important; }
.text-accent { color: var(--accent-color) !important; }
.bg-primary-subtle { background-color: rgba(28, 94, 187, 0.1) !important; color: var(--primary-color) !important; }

/* FULL PAGE LAYOUT */
.section-fullscreen {
    min-height: calc(100vh - var(--navbar-height));
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 80px 0;
    position: relative;
}

/* NAVBAR */
.navbar {
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    padding: 0;
    height: var(--navbar-height);
}
.navbar-brand {
    font-weight: 800;
    color: var(--primary-color) !important;
    font-size: 1.4rem;
    letter-spacing: -0.5px;
}
.nav-link {
    color: #4a5568 !important;
    font-weight: 500;
    font-size: 0.95rem;
    margin-left: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* BOUTONS */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 12px 28px;
    transition: all 0.3s;
    box-shadow: 0 4px 6px rgba(28, 94, 187, 0.2);
}
.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(28, 94, 187, 0.3);
}
.btn-accent {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: #fff;
    padding: 15px 35px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s;
    box-shadow: 0 4px 12px rgba(255, 171, 76, 0.3);
}
.btn-accent:hover {
    background-color: var(--accent-dark);
    border-color: var(--accent-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 171, 76, 0.4);
}
.btn-outline-secondary:hover {
     background-color: #f8f9fa;
     color: var(--primary-color);
     border-color: var(--primary-color);
}

/* HERO SECTION */
.hero-section {
    border-bottom: 4px solid var(--accent-color);
    background: linear-gradient(170deg, #ffffff 0%, #f0f7ff 100%);
}
.hero-tagline {
    text-transform: uppercase;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    color: var(--accent-color);
    margin-bottom: 1rem;
    display: block;
}
.hero-title {
    font-weight: 800;
    font-size: 3.2rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    line-height: 1.15;
}
.hero-description {
    font-size: 1.15rem;
    color: #555;
    margin-bottom: 2rem;
    max-width: 90%;
}
.hero-features-list {
    list-style: none;
    padding: 0;
    margin-bottom: 2.5rem;
}
.hero-features-list li {
    margin-bottom: 0.8rem;
    font-weight: 500;
    color: #444;
    display: flex;
    align-items: center;
}
.hero-features-list i {
    color: var(--bright-blue-color);
    margin-right: 12px;
    background: rgba(77, 171, 247, 0.1);
    padding: 5px;
    border-radius: 50%;
    font-size: 0.9rem;
}

.hero-image-container {
    padding: 12px;
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-frame);
    transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
    transition: all 0.6s ease;
}
.hero-image-container:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg) scale(1.02);
    box-shadow: var(--box-shadow-hover);
}

/* CONCEPT SECTION */
.concept-intro-box {
    border-left: 5px solid var(--primary-color);
    padding-left: 2rem;
    margin-bottom: 4rem;
}

.feature-card {
    background: white;
    padding: 3rem 2rem;
    border-radius: var(--border-radius-lg);
    border: 1px solid #eef0f2; 
    border-top: 6px solid var(--primary-color);
    box-shadow: var(--box-shadow-frame);
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}
.feature-card.accent-orange { border-top-color: var(--accent-color); }
.feature-card.accent-bright-blue { border-top-color: var(--bright-blue-color); }

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--box-shadow-hover);
}
.feature-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    background: rgba(28, 94, 187, 0.05);
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
}
.feature-card.accent-orange .feature-icon { color: var(--accent-color); background: rgba(255, 171, 76, 0.1); }
.feature-card.accent-bright-blue .feature-icon { color: var(--bright-blue-color); background: rgba(77, 171, 247, 0.1); }

.feature-list-detail {
    list-style: none;
    padding: 0;
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: #666;
}
.feature-list-detail li {
    margin-bottom: 0.5rem;
    padding-left: 1.2rem;
    position: relative;
}
.feature-list-detail li::before {
    content: "•";
    color: var(--primary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* USE CASES SECTION */
.use-case-section {
    background-color: #f8f9fa;
    border-top: 1px solid #e2e8f0;
}
.nav-pills-custom .nav-item {
    flex-shrink: 0;
    margin-right: 1px;
}
.nav-pills .nav-link {
    background-color: white;
    margin: 0 8px;
    border-radius: 6px;
    padding: 8px 12px;
    border: 1px solid #e2e8f0;
    font-weight: 600;
    color: var(--primary-color);
    box-shadow: 0 4px 8px rgba(0,0,0,0.04);
    transition: all 0.2s;
    margin: 1px;
}
.nav-pills .nav-link:hover {
     box-shadow: 0 4px 8px rgba(28, 94, 187, 0.15);
     color: var(--primary-dark);
     font-size: 0.9rem;
}
.nav-pills .nav-link.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    box-shadow: 0 4px 8px rgba(28, 94, 187, 0.3);
}

.tab-content-frame {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-top: 4px solid var(--primary-color);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: var(--box-shadow-frame);
    margin-top: 40px;
}

.workflow-step {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1rem;
    background: #fdfdfd;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #eee;
    border-left: 4px solid var(--primary-color);
    transition: transform 0.2s;
}
.workflow-step:hover {
     transform: translateX(5px);
     background: white;
     box-shadow: 0 4px 12px rgba(28, 94, 187, 0.1);
}
.step-number {
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-right: 15px;
    margin-top: 2px;
    min-width: 25px;
}

.step-illustration-img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-frame);
    border: 1px solid #e2e8f0;
}

/* TECH STACK */
.tech-stack {
    background-color: var(--primary-color);
    border-top: 5px solid var(--accent-color);
    color: white;
    padding: 60px 0;
}

/* CONTACT SECTION */
#contact .card {
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 40px -10px rgba(28, 94, 187, 0.2), 0 5px 15px -5px rgba(0,0,0,0.1) !important;
}
.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(28, 94, 187, 0.25);
}

/* FOOTER */
footer {
    background-color: #0a2240;
    color: #94a3b8;
    padding: 80px 0 30px;
    border-top: 1px solid rgba(255,255,255,0.05);
}
footer h5 { color: white; margin-bottom: 25px; font-weight: 700; letter-spacing: 0.5px;}
footer .text-muted {
    color: rgba(255, 255, 255, 0.75) !important;
}