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

:root {
    --bg: #f5f3f0;
    --card-bg: #faf9f7;
    --text: #3d3d3d;
    --text-light: #6b6b6b;
    --accent: #8b7355;
    --border: #e0ddd8;
    --num-color: #9a9a9a;
    --gradient-start: #a8b5a0;
    --gradient-end: #c4b8a8;
}

body {
    font-family: "DM Sans", "Noto Serif SC", Georgia, serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    background-image: 
        radial-gradient(circle at 0% 0%, rgba(168, 181, 160, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 100% 100%, rgba(196, 184, 168, 0.06) 0%, transparent 50%);
    min-height: 100vh;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 48px 24px 72px;
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    border-radius: 2px;
}

header h1 {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    position: relative;
}

header h1 a {
    color: var(--text);
    text-decoration: none;
    background: linear-gradient(135deg, var(--text) 0%, var(--text) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    position: relative;
}

header h1 a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    transition: width 0.3s ease;
}

header h1 a:hover::after {
    width: 100%;
}

header nav {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

header nav a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s;
    position: relative;
    padding: 4px 0;
}

header nav a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width 0.2s ease;
}

header nav a:hover {
    color: var(--text);
}

header nav a:hover::before {
    width: 100%;
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px 80px;
}

section {
    margin-bottom: 64px;
    scroll-margin-top: 24px;
}

section h2 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 14px;
    position: relative;
    padding-bottom: 12px;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    border-radius: 2px;
}

section h2 .num {
    font-size: 0.75rem;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    padding: 4px 10px;
    border-radius: 4px;
    font-family: "DM Sans", sans-serif;
    letter-spacing: 0.05em;
}

.subsection-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-light);
    margin: 32px 0 16px 0;
    padding-left: 12px;
    border-left: 3px solid var(--gradient-start);
}

.grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.timeline {
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 24px;
    bottom: 24px;
    width: 1px;
    background: linear-gradient(180deg, var(--gradient-start), var(--gradient-end), transparent);
    opacity: 0.3;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 28px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    box-shadow: 0 12px 32px rgba(102, 126, 234, 0.12);
    transform: translateY(-4px);
    border-color: transparent;
}

.card:hover::before {
    opacity: 1;
}

.card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.card-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
}

.card-meta {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-meta::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 4px;
    background: var(--accent);
    border-radius: 50%;
}

.card-desc {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 10px;
    line-height: 1.7;
}

.tag {
    font-size: 0.7rem;
    color: var(--accent);
    background: rgba(37, 99, 235, 0.08);
    padding: 5px 12px;
    border-radius: 20px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.badge {
    font-size: 0.75rem;
    color: #059669;
    background: rgba(5, 150, 105, 0.08);
    padding: 5px 12px;
    border-radius: 20px;
    font-weight: 600;
}

.paper-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.paper-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    padding: 20px 24px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.paper-item:hover {
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.08);
    border-color: transparent;
    transform: translateX(4px);
}

.paper-num {
    font-size: 0.85rem;
    font-weight: 700;
    color: transparent;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    background-clip: text;
    -webkit-background-clip: text;
    min-width: 28px;
    font-family: "DM Sans", sans-serif;
}

.paper-content {
    flex: 1;
}

.awards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.award-card {
    text-align: center;
    padding: 24px 16px;
}

.award-icon {
    font-size: 1.8rem;
    background: linear-gradient(135deg, #f59e0b, #d97706);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: block;
    margin-bottom: 12px;
}

.skills-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.skill-item {
    display: flex;
    gap: 20px;
    padding: 18px 24px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    align-items: center;
    transition: all 0.3s ease;
}

.skill-item:hover {
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.06);
    border-color: transparent;
}

.skill-label {
    font-weight: 600;
    color: var(--text);
    min-width: 80px;
    font-size: 0.95rem;
    position: relative;
    padding-left: 12px;
}

.skill-label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background: linear-gradient(180deg, var(--gradient-start), var(--gradient-end));
    border-radius: 2px;
}

.skill-value {
    color: var(--text-light);
    font-size: 0.95rem;
}

.contact-card {
    max-width: 400px;
}

.contact-card p {
    margin-bottom: 14px;
    font-size: 1rem;
}

.contact-card p:last-child {
    margin-bottom: 0;
}

.contact-card a {
    color: var(--text);
    text-decoration: none;
    transition: all 0.2s;
    position: relative;
    padding-left: 24px;
}

.contact-card a::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
    transition: transform 0.2s;
}

.contact-card a:hover::before {
    transform: translateX(4px);
}

.card a {
    color: var(--text);
    text-decoration: none;
    transition: color 0.2s;
}

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

footer {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-light);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    border-radius: 2px;
}

@media (max-width: 768px) {
    body {
        font-size: 15px;
    }
    
    header {
        flex-direction: column;
        gap: 24px;
        text-align: center;
        padding: 32px 16px 48px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    header nav {
        justify-content: center;
        gap: 12px 16px;
    }
    
    header nav a {
        font-size: 0.9rem;
        padding: 4px 8px;
    }
    
    main {
        padding: 0 16px 60px;
    }
    
    section {
        margin-bottom: 40px;
    }
    
    section h2 {
        font-size: 1.2rem;
        margin-bottom: 20px;
        gap: 10px;
    }
    
    section h2 .num {
        font-size: 0.7rem;
        padding: 3px 8px;
    }
    
    .grid,
    .awards-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    
    .card {
        padding: 20px;
        border-radius: 14px;
    }
    
    .card-title {
        font-size: 0.95rem;
    }
    
    .card-meta {
        font-size: 0.8rem;
    }
    
    .card-desc {
        font-size: 0.85rem;
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .paper-item {
        gap: 14px;
        padding: 16px 18px;
    }
    
    .paper-num {
        font-size: 0.75rem;
        min-width: 22px;
    }
    
    .paper-content .card-title {
        font-size: 0.9rem;
    }
    
    .paper-content .card-meta {
        font-size: 0.75rem;
    }
    
    .award-card {
        padding: 18px 12px;
    }
    
    .award-icon {
        font-size: 1.4rem;
        margin-bottom: 8px;
    }
    
    .award-card .card-title {
        font-size: 0.9rem;
    }
    
    .award-card .card-meta {
        font-size: 0.75rem;
    }
    
    .skill-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        padding: 16px 18px;
    }
    
    .skill-label {
        font-size: 0.9rem;
        min-width: auto;
        padding-left: 14px;
    }
    
    .skill-value {
        font-size: 0.85rem;
    }
    
    .contact-card {
        max-width: 100%;
    }
    
    footer {
        padding: 32px 16px;
        font-size: 0.8rem;
    }
}