/* Modern Academic Website CSS */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #2c3e50;
    background: #f5f7fa;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    overflow: hidden;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

h1 {
    font-size: 2.8em;
    margin-bottom: 10px;
    font-weight: 600;
}

.title {
    font-size: 1.3em;
    opacity: 0.95;
    margin-bottom: 25px;
}

/* Email Button */
.email-button {
    display: inline-block;
    background: #e74c3c;
    color: white;
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 1.2em;
    font-weight: bold;
    margin: 20px 0;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.4);
}

.email-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(231, 76, 60, 0.6);
}

.email-button i {
    margin-right: 10px;
}

/* Social Icons */
.social-icons {
    margin-top: 20px;
}

.social-icons a {
    color: white;
    font-size: 2em;
    margin: 0 15px;
    transition: transform 0.2s;
    display: inline-block;
}

.social-icons a:hover {
    transform: scale(1.2);
}

/* Tabs */
.tabs {
    display: flex;
    flex-wrap: wrap;
    background: #f8f9fa;
    border-bottom: 2px solid #e9ecef;
    padding: 0 20px;
}

.tab-button {
    background: none;
    border: none;
    padding: 15px 20px;
    font-size: 1em;
    font-weight: 600;
    color: #6c757d;
    cursor: pointer;
    transition: all 0.3s;
    border-bottom: 3px solid transparent;
}

.tab-button:hover {
    color: #667eea;
}

.tab-button.active {
    color: #667eea;
    border-bottom-color: #667eea;
}

/* Tab Content */
.tab-content {
    display: none;
    padding: 30px;
    animation: fadeIn 0.5s;
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Section Headers */
h2 {
    color: #2c3e50;
    font-size: 2em;
    margin-bottom: 25px;
    border-bottom: 3px solid #667eea;
    padding-bottom: 10px;
    display: inline-block;
}

h3 {
    color: #34495e;
    margin: 20px 0 10px;
    font-size: 1.3em;
}

/* Entry styling */
.entry-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 5px;
}

.entry-title {
    font-size: 1.2em;
    color: #2c3e50;
}

.entry-date {
    color: #e74c3c;
    font-weight: bold;
    background: #fde9e7;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.9em;
}

.education-entry, .experience-entry, .teaching-entry, .project-entry, .book-entry {
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

/* Publications */
.publications-list {
    list-style-position: inside;
    padding-left: 0;
}

.publications-list li {
    margin-bottom: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #e74c3c;
}

.publications-list a {
    color: #667eea;
    text-decoration: none;
}

.publications-list a:hover {
    text-decoration: underline;
}

/* Skills */
.skills-category {
    margin-bottom: 25px;
    background: #f8f9fa;
    padding: 15px 20px;
    border-radius: 8px;
}

.skills-category h3 {
    color: #667eea;
    margin-top: 0;
    margin-bottom: 15px;
}

.skills-category ul {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    gap: 10px;
}

.skills-category li {
    background: white;
    padding: 5px 15px;
    border-radius: 20px;
    border: 1px solid #e9ecef;
    color: #495057;
}

/* Courses */
.courses-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 25px;
}

.courses-list li {
    background: #e3f2fd;
    padding: 5px 15px;
    border-radius: 20px;
    color: #1976d2;
}

.courses-list a {
    color: #1976d2;
    text-decoration: none;
}

.courses-list a:hover {
    text-decoration: underline;
}

/* Project links */
.project-entry a {
    color: #667eea;
    text-decoration: none;
}

.project-entry a:hover {
    text-decoration: underline;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    background: #f8f9fa;
    color: #6c757d;
    border-top: 1px solid #e9ecef;
}

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 2em;
    }
    
    .tabs {
        flex-direction: column;
    }
    
    .tab-button {
        width: 100%;
        text-align: left;
    }
    
    .entry-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .entry-date {
        margin-top: 5px;
    }
    
    .social-icons a {
        font-size: 1.5em;
        margin: 0 8px;
    }
    
    .email-button {
        font-size: 1em;
        padding: 10px 20px;
    }
}