/* === GLOBAL === */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(to bottom, #f0f2f5, #ffffff);
    color: #333333;
    line-height: 1.6;
}

/* === NAVBAR === */
.navbar {
    background: linear-gradient(to right, #4b0082, #000000);
    border-bottom: 1px solid #e9ecef;
    padding: 1rem 0;
}
.navbar a {
    color: #ffffff;
    text-decoration: none;
    padding: 0.5rem 1rem;
    margin: 0 0.5rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}
.navbar a:hover {
    background-color: #3a0066;
}

/* === WELCOME BANNER === */
.welcome-banner {
    background: linear-gradient(to right, #4b0082, #000000);
    color: #ffffff;
    text-align: center;
    padding: 3rem 1rem;
    margin: 4rem 0 3rem 0;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
.welcome-banner h1 {
    margin: 0;
    font-size: 3rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}
.welcome-banner p {
    margin: 1rem 0 0 0;
    font-size: 1.5rem;
    font-weight: 300;
}

/* === FOOTER === */
.contact-bar {
    background: linear-gradient(to right, #4b0082, #000000);
    color: #ffffff;
    text-align: center;
    padding: 2rem 1rem;
    font-size: 1rem;
    box-shadow: 0 -4px 8px rgba(0,0,0,0.1);
}

/* === TITRES === */
h1, .title {
    text-align: center;
    font-size: 2.5rem;
    margin: 2rem 0 1rem 0;
    color: #333333;
    font-weight: 300;
}
h2 {
    font-size: 1.8rem;
    margin: 1.5rem 0 1rem 0;
    color: #333333;
}
h3 {
    font-size: 1.4rem;
    margin: 1rem 0 0.5rem 0;
    color: #555555;
}

/* === SECTIONS (containers) === */
.container,
.projects-container,
.engagements-container,
.contact-container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
}
.engagements-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}
.engagements-container .box {
    flex: 1 1 200px;
    margin: 0;
}

/* === BOXES (générique) === */
.box {
    background-color: #ffffff;
    border: 1px solid #e9ecef;
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1rem 0;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    text-align: center;
    color: #333333;
    text-decoration: none;
}
.box:hover {
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    transform: translateY(-5px);
}
.box img {
    width: 438px;
    height: 438px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1rem;
}
.box h2 {
    margin-top: 0;
}
.box p {
    margin: 0.5rem 0;
}

/* === FLIP BOXES === */
.images-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}
.flip-box {
    background-color: transparent;
    width: 525px;
    height: 525px;
    perspective: 1000px;
    margin: 0;
    flex: 0 0 auto;
}

.flip-box-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
}

.flip-box:hover .flip-box-inner {
    transform: rotateY(180deg);
}

.flip-box-front, .flip-box-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.flip-box-front {
    background-color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}

.flip-box-front img {
    width: 438px;
    height: 438px;
    object-fit: cover;
    border-radius: 8px;
}

.flip-box-back {
    background-color: #f8f9fa;
    color: #333333;
    transform: rotateY(180deg);
    padding: 20px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: 8px;
    background-image: none !important;
}

.flip-box-back img {
    display: none !important;
    visibility: hidden !important;
    width: 0 !important;
    height: 0 !important;
}

/* === COMPÉTENCES === */
.competence-row {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin: 2rem 0;
    background-color: #e8e8e8;
}
.competence-row .box {
    flex: 1 1 45%;
    min-width: 300px;
}

/* === CONTACT PAGE === */
.contact-form,
.contact-info {
    flex: 1;
    min-width: 300px;
    margin: 1rem;
}
.contact-form .form-group {
    margin-bottom: 1rem;
}
.contact-form label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #333333;
}
.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 1rem;
    background-color: #ffffff;
    color: #333333;
}
.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0,123,255,0.25);
}
.contact-form button {
    padding: 0.75rem 1.5rem;
    background-color: #007bff;
    border: none;
    border-radius: 4px;
    color: #ffffff;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}
.contact-form button:hover {
    background-color: #0056b3;
}
.contact-info h2 {
    margin-bottom: 1rem;
}
.social-links a {
    display: block;
    margin-bottom: 0.5rem;
    color: #007bff;
    text-decoration: none;
}
.social-links a:hover {
    text-decoration: underline;
}

/* === PROGRESS BAR === */
.progress-bar {
    background-color: #4b0082;
    color: #ffffff;
    text-align: center;
    padding: 5px;
    border-radius: 5px;
    margin: 5px 0;
    font-weight: bold;
}

/* === HIERARCHY SECTIONS === */
.section {
    margin: 4rem 4rem;
    padding: 2rem;
    background-color: #e8e8e8;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.section h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #4b0082;
    font-weight: 600;
}

/* === DROPDOWN === */
.dropdown {
    position: relative;
    display: inline-block;
}
.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #ffffff;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    list-style: none;
    padding: 0;
    margin: 0;
    z-index: 1000;
    min-width: 200px;
}
.dropdown:hover .dropdown-menu {
    display: block;
}
.dropdown-menu li {
    border-bottom: 1px solid #e9ecef;
}
.dropdown-menu li:last-child {
    border-bottom: none;
}
.dropdown-menu a {
    display: block;
    padding: 0.75rem 1rem;
    color: #333333;
    text-decoration: none;
    transition: background-color 0.3s;
}
.dropdown-menu a:hover {
    background-color: #f8f9fa;
}
.links-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}
.link {
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 1rem;
    text-decoration: none;
    color: #333333;
    transition: background-color 0.3s, box-shadow 0.3s;
    flex: 1 1 200px;
    text-align: center;
}
.link:hover {
    background-color: #e9ecef;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* === RESPONSIVE === */
@media (max-width: 1024px) {
    .container,
    .projects-container,
    .engagements-container,
    .contact-container {
        max-width: 90%;
        padding: 0 1rem;
    }
    .competence-row .box {
        flex: 1 1 48%;
    }
}
@media (max-width: 768px) {
    .navbar {
        padding: 0.5rem 0;
    }
    .navbar a {
        display: block;
        margin: 0.5rem 0;
        padding: 0.5rem;
    }
    .container,
    .projects-container,
    .engagements-container,
    .contact-container {
        padding: 0 0.5rem;
        margin: 1rem auto;
    }
    .competence-row {
        flex-direction: column;
        gap: 1rem;
    }
    .competence-row .box {
        flex: 1 1 100%;
        min-width: auto;
    }
    .contact-form,
    .contact-info {
        flex: 1 1 100%;
        margin: 0.5rem 0;
    }
    h1, .title {
        font-size: 2rem;
    }
    h2 {
        font-size: 1.5rem;
    }
    .flip-box {
        width: 100%;
        max-width: 438px;
        height: 350px;
        margin: 10px;
    }
    .flip-box-front img {
        width: 350px;
        height: 350px;
    }
    .welcome-banner {
        padding: 2rem 1rem;
    }
    .welcome-banner h1 {
        font-size: 2rem;
    }
    .welcome-banner p {
        font-size: 1.2rem;
    }
    .box img {
        width: 350px;
        height: 350px;
    }
    .section {
        padding: 1rem;
        margin: 2rem 0;
    }
}
@media (max-width: 480px) {
    .box {
        padding: 1rem;
    }
    .navbar a {
        font-size: 0.9rem;
    }
    h1, .title {
        font-size: 1.8rem;
    }
    h2 {
        font-size: 1.3rem;
    }
    .flip-box {
        max-width: 350px;
        height: 263px;
    }
    .flip-box-front img {
        width: 263px;
        height: 263px;
    }
    .welcome-banner h1 {
        font-size: 1.8rem;
    }
    .welcome-banner p {
        font-size: 1rem;
    }
    .box img {
        width: 280px;
        height: 280px;
    }
}