/* ============================================
   Main Stylesheet - Academic Homepage
   ============================================ */

/* CSS Variables */
:root {
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --secondary-color: #764ba2;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
    --radius: 10px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-color);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

/* Typography */
h1, h2, h3 {
    font-weight: 600;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    text-decoration: underline;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
    border-radius: var(--radius);
    margin-bottom: 30px;
}

.profile-img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 5px solid white;
    margin-bottom: 20px;
    object-fit: cover;
    box-shadow: var(--shadow);
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.header .title {
    font-size: 1.2em;
    opacity: 0.9;
    margin-bottom: 5px;
}

.header .affiliation {
    opacity: 0.8;
}

/* Section Styles */
.section {
    background: var(--card-bg);
    padding: 30px;
    margin-bottom: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.section:hover {
    box-shadow: var(--shadow-hover);
}

.section-title {
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
    font-size: 1.5em;
}

.section-subtitle {
    color: var(--text-light);
    font-size: 1.1em;
    margin: 20px 0 15px 0;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
}

/* Contact Styles */
.contact-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.contact-item {
    background: #f8f9fa;
    padding: 10px 15px;
    border-radius: 5px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.contact-item:hover {
    background: #e9ecef;
}

/* Research Tags */
.tag-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.research-tag {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 0.9em;
    transition: var(--transition);
}

.research-tag:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* Timeline Styles */
.timeline {
    position: relative;
}

.timeline-item {
    margin-bottom: 25px;
    padding-left: 25px;
    border-left: 3px solid var(--primary-color);
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -8px;
    top: 5px;
    width: 12px;
    height: 12px;
    background: var(--primary-color);
    border-radius: 50%;
}

.timeline-date {
    font-weight: bold;
    color: var(--primary-color);
    font-size: 0.9em;
}

.timeline-title {
    font-weight: bold;
    margin: 5px 0;
    font-size: 1.1em;
}

.timeline-institution {
    color: var(--text-light);
    margin-bottom: 5px;
}

.timeline-description {
    color: var(--text-light);
    font-size: 0.95em;
}

/* Publication Styles */
.publication-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.publication-item {
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
}

.publication-item:hover {
    background: #e9ecef;
    transform: translateX(5px);
}

.publication-title {
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 8px;
    font-size: 1.05em;
}

.publication-authors {
    color: var(--text-light);
    font-size: 0.9em;
    margin-bottom: 5px;
}

.publication-authors .highlight {
    color: var(--primary-color);
    font-weight: 600;
}

.publication-venue {
    color: var(--primary-color);
    font-size: 0.9em;
    font-weight: 500;
    margin-bottom: 8px;
}

.publication-links {
    display: flex;
    gap: 15px;
    font-size: 0.85em;
}

.publication-links a {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* Awards List */
.awards-list {
    list-style: none;
}

.awards-list li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.awards-list li:last-child {
    border-bottom: none;
}

.award-name {
    font-weight: 600;
}

.award-source {
    color: var(--text-light);
    font-size: 0.9em;
}

.award-year {
    color: var(--primary-color);
    font-weight: 500;
}

/* Service Lists */
.service-category {
    margin-bottom: 20px;
}

.service-category h4 {
    color: var(--text-color);
    margin-bottom: 10px;
    font-size: 1em;
}

.service-list {
    list-style: none;
    padding-left: 15px;
}

.service-list li {
    padding: 5px 0;
    color: var(--text-light);
    position: relative;
    padding-left: 15px;
}

.service-list li::before {
    content: '•';
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

/* Footer Styles */
.footer {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-light);
    font-size: 0.9em;
    background: var(--card-bg);
    border-radius: var(--radius);
    margin-top: 20px;
}

.footer p {
    margin: 5px 0;
}

/* Loading State */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
}

/* Utility Classes */
.hidden {
    display: none;
}

.text-center {
    text-align: center;
}

.mb-0 {
    margin-bottom: 0;
}

.mt-20 {
    margin-top: 20px;
}