@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.7;
    color: #334155;
    background-color: #f8fafc;
    padding-top: 70px; /* Offset for the sticky top navbar */
    scroll-behavior:
    smooth;
}

/* --- STICKY TOP NAVBAR --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background-color: #0f172a; /* Deep Minimal Executive Navy */
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.nav-container {
    max-width: 1000px;
    height: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.nav-brand {
    color: #ffffff;
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    background: none;
    border: none;
    color: #94a3b8;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    color: #ffffff;
    background-color: #1e293b;
}

.nav-btn.active {
    color: #ffffff;
    background-color: #38bdf8; /* Elite Accent Blue */
    font-weight: 600;
}

/* --- WRAPPER FOR CONTENT PAGE CARD --- */
.main-wrapper {
    max-width: 1000px;
    margin: 3rem auto;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
    padding: 3.5rem 4rem;
    min-height: 550px;
}

/* --- ROUTER LOGIC --- */
.page-content {
    display: none;
    animation: smoothView 0.35s ease;
}

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

@keyframes smoothView {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- HOME PROFILE HEADER --- */
.profile-header {
    display: flex;
    gap: 3rem;
    align-items: center;
    margin-bottom: 2rem;
}

.profile-img {
    width: 160px;
    height: 160px;
    border-radius: 16px; /* Elegant slightly curved image border instead of basic circle */
    object-fit: cover;
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.profile-title-block h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 0.3rem;
}

.sub-role {
    font-weight: 600;
    color: #38bdf8;
    font-size: 0.95rem;
}

.sub-inst {
    font-size: 0.9rem;
    color: #475569;
    font-weight: 500;
}

.sub-office {
    font-size: 0.85rem;
    color: #64748b;
    margin-top: 0.4rem;
}

.sub-office i {
    color: #94a3b8;
    margin-right: 0.2rem;
}

/* --- SOCIAL GRID LINKS --- */
.social-grid {
    display: flex;
    gap: 1rem;
    margin-top: 1.2rem;
}

.social-grid a {
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    color: #475569;
    background-color: #f1f5f9;
    padding: 0.3rem 0.8rem;
    border-radius: 6px;
    border: 1px solid #e2e8f0;
    transition: all 0.2s ease;
}

.social-grid a:hover {
    background-color: #0f172a;
    color: #ffffff;
    border-color: #0f172a;
}

.divider {
    border: 0;
    height: 1px;
    background: #e2e8f0;
    margin: 2.5rem 0;
}

/* --- REUSABLE CORE STYLES --- */
h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 1.2rem;
    position: relative;
}

p {
    color: #475569;
    text-align: justify;
    font-size: 0.95rem;
    margin-bottom: 1.2rem;
}

.section-intro {
    font-size: 1rem;
    color: #64748b;
    border-left: 3px solid #cbd5e1;
    padding-left: 1rem;
    margin-bottom: 2rem;
}

.section-block {
    margin-bottom: 2.5rem;
}

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

.styled-list li {
    font-size: 0.95rem;
    color: #475569;
    margin-bottom: 0.6rem;
    display: flex;
    align-items: center;
}

.styled-list i {
    color: #38bdf8;
    margin-right: 0.8rem;
    font-size: 0.85rem;
}

/* --- MODERN CONTENT ITEM CARDS --- */
.card-item {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    padding: 1.8rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    transition: box-shadow 0.2s ease;
}

.card-item:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.card-title {
    font-size: 1.05rem;
    color: #0f172a;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.card-authors {
    font-size: 0.9rem;
    color: #475569;
    margin-bottom: 0.2rem;
}

/* --- JOURNAL / PUBLICATION DETAILS --- */
.card-journal {
    font-size: 0.85rem;
    color: #64748b; 
    margin-top: 0.2rem;
    margin-bottom: 0.8rem;
    line-height: 1.5; /* Makes the text flow naturally as normal lines */
}

.card-journal .journal-name {
    font-weight: 600;
    color: #0369a1; 
    font-style: italic;
}

.card-desc {
    font-size: 0.9rem;
    color: #64748b;
    margin-top: 0.8rem;
    background: #f8fafc;
    padding: 0.8rem;
    border-radius: 6px;
}

/* --- BADGES --- */
.badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    margin-bottom: 0.6rem;
}

.active-badge { background: #e0f2fe; color: #0369a1; }
.repo-badge { background: #f1f5f9; color: #475569; }

/* --- CARD BUTTON ACTIONS --- */
.card-actions {
    margin-top: 1rem;
    display: flex;
    gap: 0.5rem;
}

.btn-action {
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 500;
    color: #0f172a;
    border: 1px solid #cbd5e1;
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.btn-action:hover {
    background: #0f172a;
    color: #ffffff;
    border-color: #0f172a;
}

/* --- TIMELINE COMPONENT FOR TALKS --- */
.timeline-row {
    display: flex;
    gap: 2.5rem;
    border-bottom: 1px solid #f1f5f9;
    padding: 1.5rem 0;
}

.time-meta {
    width: 15%;
    font-weight: 700;
    color: #0f172a;
    font-size: 0.95rem;
}

.time-details h4 {
    font-size: 1rem;
    color: #0f172a;
    font-weight: 600;
}

.location-tag {
    font-size: 0.85rem;
    color: #38bdf8;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

/* --- QUOTE CALLOUT FOR TEACHING --- */
.teaching-quote {
    font-style: italic;
    color: #64748b;
    border-left: 4px solid #38bdf8;
    padding-left: 1.2rem;
    margin-bottom: 2rem;
}

.compact-list {
    margin-top: 0.8rem;
    padding-left: 0.5rem;
}

/* --- PREMIUM CV DATA TABLE --- */
.premium-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.premium-table td {
    padding: 1rem 0.8rem;
    border-bottom: 1px solid #f1f5f9;
    font-size: 0.9rem;
    vertical-align: top;
}

.premium-table td:first-child {
    width: 25%;
    color: #0f172a;
    font-weight: 600;
}

/* --- RESPONSIVE CORE MEDIA BREAKPOINTS --- */
@media (max-width: 820px) {
    .nav-container {
        flex-direction: column;
        padding: 0.5rem;
        height: auto;
    }
    .navbar {
        height: auto;
        position: relative;
    }
    body {
        padding-top: 0;
    }
    .main-wrapper {
        margin: 1rem;
        padding: 2rem 1.5rem;
    }
    .profile-header {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    .social-grid {
        justify-content: center;
        flex-wrap: wrap;
    }
    .timeline-row {
        flex-direction: column;
        gap: 0.5rem;
    }
    .time-meta {
        width: 100%;
    }
}


/* --- TOP PAGE FILTER BUTTONS --- */
.top-page-buttons {
    display: flex;
    gap: 0.8rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
    border-bottom: 1px solid #e2e8f0; /* Subtle line to separate from content */
    padding-bottom: 1.5rem;
}

/* Distinctive styling for the top navigation buttons */
.top-page-buttons .btn-action {
    padding: 0.5rem 1.2rem;
    font-size: 0.9rem;
    font-weight: 600;
    background-color: #f8fafc;
    color: #475569;
    border: 1px solid #cbd5e1;
    border-radius: 50px; /* Elegant pill shape */
    transition: all 0.3s ease;
}

/* Elite Blue accent for the icons by default */
.top-page-buttons .btn-action i {
    color: #38bdf8; 
    margin-right: 0.4rem;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

/* Hover effect: Turns to Executive Navy with a slight lift */
.top-page-buttons .btn-action:hover {
    background-color: #0f172a; 
    color: #ffffff;
    border-color: #0f172a;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.15);
    transform: translateY(-2px);
}

.top-page-buttons .btn-action:hover i {
    color: #ffffff; /* Icons turn white on hover */
}