:root {
    --color-primary: #1a2639;
    --color-accent: #3d5a80;
    --color-accent-light: #5b8cb8;
    --color-highlight: #ee6c4d;
    --color-bg: #fafafa;
    --color-card: #ffffff;
    --color-text: #2c2c2c;
    --color-text-secondary: #5a5a5a;
    --color-border: #e8e8e8;
    --color-tag-bg: #f0f4f8;
    --max-width: 860px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 15px;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    transition: box-shadow 0.3s;
}

nav.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 56px;
}

.nav-name {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--color-primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    transition: color 0.2s;
    letter-spacing: 0.01em;
}

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

/* Hero / About */
.hero {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 7rem 2rem 3rem;
    display: flex;
    gap: 3rem;
    align-items: flex-start;
}

.hero-photo {
    flex-shrink: 0;
}

.hero-photo img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-border);
}

.hero-text h1 {
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 2.2rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 0.3rem;
}

.hero-text .subtitle {
    color: var(--color-accent);
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.hero-text .bio {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 1.2rem;
}

.hero-text .bio a {
    color: var(--color-accent);
    text-decoration: none;
}

.hero-text .bio a:hover {
    text-decoration: underline;
}

.hero-links {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.hero-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.85rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 0.82rem;
    font-weight: 500;
    transition: all 0.2s;
    background: var(--color-card);
}

.hero-links a:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-tag-bg);
}

/* Main content */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem 4rem;
}

section {
    margin-bottom: 3rem;
}

.section-title {
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-primary);
    display: inline-block;
}

/* News */
.news-list {
    list-style: none;
}

.news-item {
    display: flex;
    gap: 1rem;
    padding: 0.5rem 0;
    font-size: 0.9rem;
    align-items: baseline;
}

.news-date {
    flex-shrink: 0;
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.82rem;
    min-width: 80px;
}

.news-content {
    color: var(--color-text-secondary);
}

/* Publications */
.pub-note {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

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

.pub-item {
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
}

.pub-item:last-child {
    border-bottom: none;
}

.pub-venue {
    display: inline-block;
    background: var(--color-primary);
    color: white;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    margin-bottom: 0.4rem;
}

.pub-venue.top-tier {
    background: var(--color-accent);
}

.pub-venue.under-review {
    background: var(--color-text-secondary);
}

.pub-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text);
    margin-bottom: 0.3rem;
    line-height: 1.5;
}

.pub-title a {
    color: var(--color-text);
    text-decoration: underline;
    text-decoration-color: var(--color-border);
    text-underline-offset: 2px;
    transition: all 0.2s;
}

.pub-title a:hover {
    color: var(--color-accent);
}

.pub-authors {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.pub-authors strong {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* Entries (Experience, Education, etc.) */
.entry {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 0.8rem 0;
    gap: 1rem;
}

.entry-left {
    flex: 1;
}

.entry-org {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text);
}

.entry-role {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    margin-top: 0.15rem;
}

.entry-detail {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: 0.3rem;
    line-height: 1.6;
}

.entry-detail a {
    color: var(--color-accent);
    text-decoration: none;
}

.entry-detail li {
    margin-bottom: 0.2rem;
}

.entry-right {
    flex-shrink: 0;
    text-align: right;
}

.entry-period {
    font-size: 0.82rem;
    color: var(--color-accent);
    font-weight: 500;
}

.entry-location {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

/* Awards */
.award-item {
    padding: 0.5rem 0;
}

.award-name {
    font-weight: 600;
    font-size: 0.92rem;
}

.award-detail {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: 0.15rem;
}

/* Academic Services */
.service-item {
    padding: 0.5rem 0;
}

.service-role {
    font-weight: 600;
    font-size: 0.92rem;
}

.service-detail {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: 0.15rem;
}

/* Footer */
footer {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.8rem;
}

/* Mobile */
@media (max-width: 640px) {
    .hero {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding-top: 5rem;
        gap: 1.5rem;
    }

    .hero-text h1 {
        font-size: 1.7rem;
    }

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

    .nav-links {
        gap: 1rem;
    }

    .nav-links a {
        font-size: 0.78rem;
    }

    .entry {
        flex-direction: column;
        gap: 0.2rem;
    }

    .entry-right {
        text-align: left;
    }

    .news-item {
        flex-direction: column;
        gap: 0.2rem;
    }
}

.menu-toggle {
    display: none;
}

@media (max-width: 480px) {
    .nav-links {
        display: none;
    }

    .menu-toggle {
        display: block;
        background: none;
        border: none;
        font-size: 1.2rem;
        color: var(--color-text);
        cursor: pointer;
    }

    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        background: white;
        padding: 1rem 2rem;
        border-bottom: 1px solid var(--color-border);
        gap: 0.8rem;
    }
}