/* --- Global Styles & Variables --- */
:root {
    --primary-blue: #005dff;
    --dark-text: #333;
    --light-text: #666;
    --background-color: #f7f7f7;
    --white-color: #ffffff;
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.08);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--dark-text);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem;
}

.main-container {
    flex-grow: 1;
}

a {
    text-decoration: none;
    color: var(--dark-text);
    border-bottom: 1px dashed var(--dark-text);
}

/* --- Header --- */
.main-header {
    background-color: var(--white-color);
    padding: 2rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
}

.logo-square {
    width: 12px;
    height: 12px;
    background-color: var(--primary-blue);
    margin-right: 15px;
}

.logo-text h1 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0;
}

.logo-text p {
    font-size: 0.8rem;
    color: var(--light-text);
    margin: 0;
}

.navigation {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.lang-switcher {
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    cursor: pointer;
}

.lang-switcher .fa-chevron-down {
    font-size: 0.7rem;
    margin-left: 0.5rem;
}

.navigation nav {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    border-bottom: none;
}

.nav-link.active {
    font-weight: 700;
    color: var(--primary-blue);
}

/* --- Main Content --- */
.main-content {
    display: block;
    gap: 2.5rem;
    align-items: flex-start;
    padding-top: 2rem;
}

.intro-section {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2.5rem;
}

/* Profile Card (Left) */
.profile-card {
    background-color: var(--white-color);
    padding: 2.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--shadow-color);
    text-align: center;
    width: 300px;
    flex-shrink: 0;
    position: relative;
    top: -40px;
}

.profile-pic {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 1rem;
    border: 4px solid var(--white-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.profile-card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.divider {
    width: 30px;
    height: 3px;
    background-color: var(--primary-blue);
    margin: 0 auto 1rem;
    border-radius: 2px;
}

.specialties {
    font-size: 0.9rem;
    color: var(--light-text);
    margin-bottom: 1.5rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.social-links a {
    color: var(--dark-text);
    font-size: 1.2rem;
    transition: color 0.3s ease;
    border-bottom: none;
}

.social-links a:hover {
    color: var(--primary-blue);
}

/* Content Area (Right) */
.content-area {
    padding-top: 1rem;
    flex-grow: 1; 
}

.toggle-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.btn {
    padding: 0.7rem 1.5rem;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.btn.btn-primary {
    background-color: var(--primary-blue);
    color: var(--white-color);
    border: 1px solid var(--primary-blue);
}

.btn.btn-primary:hover {
    background-color: var(--primary-blue);
    color: var(--white-color);
    opacity: 0.8;
    border-color: var(--primary-blue);
}

.btn.btn-secondary {
    background-color: var(--white-color);
    color: var(--dark-text);
}

.btn.btn-secondary:hover {
    background-color: var(--background-color);
}

.content-panel {
    display: none;
}

.content-panel.active {
    display: block;
}

.content-area p {
    font-size: 1rem;
    color: var(--light-text);
    margin-bottom: 1.5rem;
}

.content-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--dark-text);
    border-bottom: 2px solid var(--primary-blue);
    padding-bottom: 0.5rem;
    display: inline-block;
}

/* --- Footer --- */
.main-footer {
    background-color: var(--white-color);
    padding: 1.5rem 0;
    border-top: 1px solid var(--border-color);
    color: var(--light-text);
    font-size: 0.9rem;
}

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

.footer-social {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-social a {
    color: var(--light-text);
    font-size: 1.2rem;
    transition: color 0.3s ease;
    border-bottom: none;
}

.footer-social a:hover {
    color: var(--primary-blue);
}

.book-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(450px, 100%), 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.book-card {
    background-color: var(--white-color);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--shadow-color);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.book-cover {
    max-width: 180px;
    height: 250px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 1rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.book-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--dark-text);
}

.book-description {
    font-size: 0.9rem;
    color: var(--light-text);
    margin-bottom: 1rem;
    flex-grow: 1;
    text-align: left;
}

.insight-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 2rem;
}

.insight-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
    border-bottom: none;
}

.insight-card {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    background-color: var(--white-color);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: all 0.3s ease;
    text-align: left;
}

.insight-card:hover {
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    transform: translateY(-5px);
    cursor: pointer;
}

.insight-card-image {
    width: 200px;
    height: 200px;
    object-fit: cover;
    flex-shrink: 0;
    border-radius: 4px;
}

.insight-card-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.insight-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--dark-text);
}

.insight-date {
    font-size: 0.8rem;
    color: var(--light-text);
    margin-bottom: 1rem;
}

.insight-summary {
    font-size: 0.9rem;
    color: var(--light-text);
    margin-bottom: 1rem;
    flex-grow: 1;
}

/* --- Skills Section --- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.skill-category {
    background-color: var(--white-color);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--shadow-color);
}

.skill-category h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.skill-category ul {
    list-style-type: none;
    padding-left: 0;
}

.skill-category li {
    font-size: 0.9rem;
    color: var(--light-text);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
}

.skill-category li::before {
    content: '25A0';
    color: var(--primary-blue);
    font-size: 0.7rem;
    margin-right: 0.75rem;
    display: inline-block;
}

.skills-quadrant {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.quadrant {
    background-color: var(--white-color);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--shadow-color);
}

.quadrant h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quadrant ul {
    list-style-type: none;
    padding-left: 0;
    margin: 0;
    margin-bottom: -0.5rem;
}

.quadrant li {
    font-size: 0.9rem;
    color: var(--light-text);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: flex-start;
}

.quadrant li::before {
    content: '■';
    color: var(--primary-blue);
    font-size: 0.5rem;
    margin-right: 0.75rem;
    display: inline-block;
    line-height: 1.5;
}

.quadrant li:last-child {
    margin-bottom: 0;
}

/* Table Styling */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    background-color: var(--white-color);
}

table thead {
    background-color: var(--primary-blue);
    color: var(--white-color);
}

table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

table tbody tr:nth-child(even) {
    background-color: var(--background-color);
}

.table tbody tr:hover {
    background-color: #eef;
}

/* List Item Styling for content-area */
.content-area ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 1.5rem;
}

.content-area ul li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--light-text);
}

.content-area ul li::before {
    content: '•';
    color: var(--primary-blue);
    position: absolute;
    left: 0;
    font-size: 1.2rem;
    line-height: 1;
}

.insight-image {
    display: block;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 1.5rem;
    max-width: 100%;
    height: auto;
}

.social-share-buttons a {
    border-bottom: none;
}

/* --- Responsive Design --- */
@media (max-width: 992px) {
    .insight-card {
        flex-direction: column;
        align-items: flex-start;
    }

    .insight-card-image-landscape, .insight-card-image-square {
        width: 100%;
        height: 200px; /* Adjust height for better aspect ratio on mobile */
    }
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .main-header .container, .navigation, .main-footer .container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .logo {
       flex-direction: column;
    }

    .main-content {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .intro-section {
        flex-direction: column;
        align-items: center;
    }

    .profile-card {
        width: 100%;
        max-width: 350px;
        top: 0;
    }

    .toggle-buttons {
        justify-content: center;
    }

    .content-title {
        font-size: 1.5rem;
    }

    .book-list {
        grid-template-columns: 1fr;
    }

    .skills-quadrant {
        grid-template-columns: 1fr;
    }
}