/* ===== Variables ===== */
:root {
    /* Dark theme (default) */
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --text-primary: #e8e8e8;
    --text-secondary: #a0a0a0;
    --accent-primary: #00d9ff;
    --accent-secondary: #7b2cbf;
    --accent-gradient: linear-gradient(135deg, #00d9ff, #7b2cbf);
    --accent-orange: #ff6b35;
    --border-radius: 12px;
    --transition: 0.3s ease;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #555555;
    --accent-primary: #0066cc;
    --accent-secondary: #7b2cbf;
    --accent-gradient: linear-gradient(135deg, #0066cc, #7b2cbf);
    --accent-orange: #e85d04;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background var(--transition), color var(--transition);
}

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

a:hover {
    color: var(--accent-secondary);
}

img {
    max-width: 100%;
    height: auto;
    image-rendering: auto;
    image-rendering: -webkit-optimize-contrast;
}

/* ===== Theme Toggle ===== */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: var(--bg-card);
    color: var(--accent-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}

.theme-toggle:hover {
    transform: scale(1.1);
    background: var(--accent-primary);
    color: var(--bg-primary);
}

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

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

[data-theme="light"] .sun-icon {
    display: block;
}

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

/* ===== Layout ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--bg-secondary);
}

.section h2 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 40px;
    color: var(--text-primary);
    display: inline-block;
    padding-bottom: 8px;
    border-bottom: 3px solid var(--accent-primary);
}

/* ===== Hero ===== */
.hero {
    padding: 80px 0 40px;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.profile {
    display: flex;
    align-items: flex-start;
    gap: 40px;
}

.profile-image img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--accent-primary);
    box-shadow: 0 0 30px rgba(0, 217, 255, 0.3);
    transition: transform var(--transition), box-shadow var(--transition);
}

.profile-image img:hover {
    transform: scale(1.05);
    box-shadow: 0 0 50px rgba(0, 217, 255, 0.5);
}

.profile-info h1 {
    font-size: 2.8rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.profile-info .title {
    font-size: 1.3rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 4px;
}

.profile-info .affiliation {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.profile-info .affiliation a {
    color: var(--accent-primary);
}

.profile-info .about-intro {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
    max-width: 500px;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 24px;
}

.tag {
    background: rgba(0, 217, 255, 0.15);
    color: var(--accent-primary);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid rgba(0, 217, 255, 0.3);
    transition: all var(--transition);
}

[data-theme="light"] .tag {
    background: rgba(0, 102, 204, 0.1);
    border-color: rgba(0, 102, 204, 0.3);
}

.tag:hover {
    background: rgba(0, 217, 255, 0.25);
    border-color: var(--accent-primary);
}

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

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(0, 217, 255, 0.1);
    color: var(--accent-primary);
    transition: all var(--transition);
}

[data-theme="light"] .social-links a {
    background: rgba(0, 102, 204, 0.1);
}

.social-links a:hover {
    background: var(--accent-primary);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 217, 255, 0.4);
}

/* ===== Navigation ===== */
.nav {
    background: var(--bg-secondary);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .nav {
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.nav .container {
    display: flex;
    justify-content: center;
    gap: 40px;
    padding: 16px 24px;
}

.nav a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all var(--transition);
}

.nav a:hover {
    color: var(--accent-primary);
    background: rgba(0, 217, 255, 0.1);
}

/* ===== Publication Cards ===== */
.pub-card {
    display: flex;
    gap: 28px;
    padding: 28px;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    margin-bottom: 24px;
    border-left: 4px solid var(--accent-primary);
    transition: all var(--transition);
    box-shadow: var(--shadow);
}

[data-theme="light"] .pub-card {
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-left: 4px solid var(--accent-primary);
}

.pub-card:hover {
    transform: translateX(8px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.2);
}

.pub-image {
    flex-shrink: 0;
}

.pub-image img {
    width: 400px;
    height: 250px;
    object-fit: contain;
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 8px;
}

.placeholder-image {
    width: 400px;
    height: 250px;
    background: var(--accent-gradient);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.3rem;
    font-weight: 700;
}

.pub-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.4;
}

.pub-content .authors {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.pub-content .authors strong {
    color: var(--accent-orange);
}

.pub-content .venue {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 14px;
}

.badge {
    display: inline-block;
    background: var(--accent-gradient);
    color: #fff;
    padding: 3px 12px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 8px;
}

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

.links a {
    display: inline-block;
    padding: 8px 16px;
    background: var(--accent-primary);
    color: #fff;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition);
}

.links a:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
    color: #fff;
}

/* ===== Timeline ===== */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.timeline-item {
    display: flex;
    gap: 32px;
    padding: 28px;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    transition: all var(--transition);
    box-shadow: var(--shadow);
}

[data-theme="light"] .timeline-item {
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.timeline-item:hover {
    transform: translateX(8px);
}

.timeline-item .year {
    flex-shrink: 0;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-primary);
    min-width: 130px;
}

.timeline-item .content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.timeline-item .content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.timeline-item .content .detail {
    font-size: 0.85rem;
    opacity: 0.7;
}

/* ===== Awards ===== */
.awards-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.award-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 22px 28px;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    transition: all var(--transition);
    box-shadow: var(--shadow);
}

[data-theme="light"] .award-card {
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.award-card:hover {
    transform: translateX(8px);
    background: rgba(0, 217, 255, 0.05);
}

.award-year {
    flex-shrink: 0;
    font-size: 0.85rem;
    font-weight: 700;
    color: #fff;
    background: var(--accent-gradient);
    padding: 8px 16px;
    border-radius: 6px;
}

.award-card a {
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: color var(--transition);
}

.award-card a:hover {
    color: var(--accent-primary);
}

.award-card .award-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.award-card .award-title {
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
}

.award-card a.award-title {
    color: var(--accent-primary);
    transition: color var(--transition);
}

.award-card a.award-title:hover {
    color: var(--accent-secondary);
}

.award-card .award-desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.5;
}

.award-card .award-link {
    color: var(--accent-primary);
    font-weight: 500;
    transition: color var(--transition);
}

.award-card .award-link:hover {
    color: var(--accent-secondary);
}

.award-card .award-org {
    color: var(--text-secondary);
    font-size: 0.8rem;
    opacity: 0.7;
}

/* ===== Footer ===== */
.footer {
    padding: 40px 0;
    text-align: center;
    background: var(--bg-secondary);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .footer {
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.footer p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .theme-toggle {
        top: 10px;
        right: 10px;
        width: 40px;
        height: 40px;
    }

    .profile {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .profile-info h1 {
        font-size: 2rem;
    }

    .profile-info .about-intro {
        max-width: 100%;
    }

    .tags {
        justify-content: center;
    }

    .social-links {
        justify-content: center;
    }

    .nav .container {
        gap: 16px;
        flex-wrap: wrap;
    }

    .pub-card {
        flex-direction: column;
    }

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

    .pub-image img,
    .placeholder-image {
        width: 100%;
        max-width: 400px;
        height: auto;
        min-height: 200px;
    }

    .timeline-item {
        flex-direction: column;
        gap: 8px;
    }

    .timeline-item .year {
        min-width: auto;
    }

    .award-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .section {
        padding: 60px 0;
    }
}