/* Modern Minimal Portfolio Styles */

:root {
    /* Light theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #1a1a1a;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-color: #e5e7eb;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --card-bg: #ffffff;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --text-primary: #e5e7eb;
    --text-secondary: #9ca3af;
    --text-tertiary: #6b7280;
    --border-color: #2d2d2d;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --card-bg: #1a1a1a;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 680px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="light"] .moon-icon,
.moon-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

/* Navigation */
.nav {
    padding: 40px 0 20px;
    margin-bottom: 40px;
}

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

.nav-logo {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    transition: opacity 0.2s;
}

.nav-logo:hover {
    opacity: 0.7;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    padding: 60px 0 80px;
}

.hero-content {
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.profile-image {
    display: inline-block;
    margin-right: 16px;
    vertical-align: middle;
}

.avatar {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #7c3aed);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 28px;
    font-weight: 600;
}

.avatar-image {
    width: 128px;
    height: 128px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

.hero-title {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
    display: inline-block;
    vertical-align: middle;
}

.wave {
    display: inline-block;
    animation: wave 2s infinite;
}

@keyframes wave {
    0%, 100% { transform: rotate(0deg); }
    10%, 30% { transform: rotate(14deg); }
    20% { transform: rotate(-8deg); }
    40% { transform: rotate(-4deg); }
    50% { transform: rotate(10deg); }
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.hero-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.hero-badges {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.badge {
    display: inline-block;
    padding: 6px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
}

.hero-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* Sections */
.section {
    padding: 60px 0;
}

.section-alt {
    background: var(--bg-secondary);
    margin: 0 -20px;
    padding-left: 20px;
    padding-right: 20px;
}

.section-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.section-description {
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-size: 16px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.link-arrow {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.link-arrow:hover {
    color: var(--text-primary);
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.card {
    padding: 24px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.card-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Technologies */
.tech-section {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.tech-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tech-tag {
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.tech-tag:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Publications */
.publications-list {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.publication-card {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: 24px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
}

.publication-card:last-child {
    border-bottom: none;
}

.publication-year {
    font-size: 14px;
    color: var(--text-tertiary);
    font-weight: 500;
    padding-top: 2px;
}

.publication-content {
    min-width: 0;
}

.publication-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    line-height: 1.5;
}

.publication-authors {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    line-height: 1.5;
}

.publication-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    margin-bottom: 12px;
}

.publication-journal {
    font-size: 13px;
    color: var(--text-secondary);
    font-style: italic;
}

.publication-doi {
    font-size: 13px;
    color: var(--accent);
    text-decoration: none;
}

.publication-doi:hover {
    text-decoration: underline;
}

.publication-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
}

.publication-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.pub-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s;
}

.pub-link:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    margin-top: 40px;
}

.contact-card {
    padding: 24px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.contact-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.contact-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 14px;
}

.contact-link:hover {
    text-decoration: underline;
}

.contact-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* Footer */
.footer {
    padding: 60px 0 40px;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer-text {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.footer-subtext {
    font-size: 13px;
    color: var(--text-tertiary);
}

/* Responsive */
@media (max-width: 640px) {
    .nav-links {
        gap: 16px;
    }

    .nav-links a {
        font-size: 13px;
    }

    .hero-title {
        font-size: 28px;
    }

    .section-title {
        font-size: 22px;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .publication-card {
        grid-template-columns: 50px 1fr;
        gap: 16px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .theme-toggle {
        top: 16px;
        right: 16px;
        width: 40px;
        height: 40px;
    }
}

/* Print styles */
@media print {
    .theme-toggle,
    .nav-links {
        display: none;
    }

    .section {
        break-inside: avoid;
    }
}

/* Hero Location */
.hero-location {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* Links Section */
.links-section {
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
}

.links-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
    margin-top: 24px;
}

.links-title:first-child {
    margin-top: 0;
}

.social-links,
.team-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.social-link,
.team-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
}

.social-link:hover,
.team-link:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

/* Featured Project Cards */
.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
    gap: 12px;
}

.project-type {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-badges {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.project-badge {
    padding: 4px 10px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 11px;
    color: var(--text-secondary);
    font-weight: 500;
}

.project-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.4;
}

.project-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    flex-grow: 1;
}

.project-meta {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.project-authors {
    font-size: 13px;
    color: var(--text-secondary);
}

.project-journal {
    font-size: 13px;
    color: var(--text-tertiary);
    font-style: italic;
}

.project-links {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.project-link.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.project-link:hover {
    transform: translateY(-1px);
}

.project-link.primary:hover {
    background: var(--accent-hover);
}

.project-link:not(.primary):hover {
    border-color: var(--accent);
    color: var(--accent);
}

.view-all-section {
    text-align: center;
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
}

.link-arrow-large {
    color: var(--accent);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: color 0.2s;
}

.link-arrow-large:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* Responsive adjustments for featured cards */
@media (max-width: 640px) {
    .featured-grid {
        grid-template-columns: 1fr;
    }

    .project-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .project-links {
        flex-direction: column;
    }

    .project-link {
        justify-content: center;
    }
}