:root {
    --bg: #1C1B1F;
    --surface: #242A24;
    --primary: #A4F3B3;
    --text: #E3E3E3;
    --text-secondary: #A0A0A0;
}

body {
    margin: 0;
    padding: 0;
    font-family: system-ui, sans-serif;
    background-color: var(--bg);
    color: var(--text);
}

header {
    padding: 1rem 2rem;
    display: flex;
    gap: 1rem;
    background: var(--surface);
    border-bottom-left-radius: 24px;
    border-bottom-right-radius: 24px;
}

.tab-btn {
    background: transparent;
    color: var(--text);
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: 100px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-btn.active {
    background: var(--primary);
    color: #000;
    font-weight: 600;
}

main {
    padding: 2rem;
    max-width: 900px;
    margin: 0 auto;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-card {
    background: var(--surface);
    border-radius: 24px;
    padding: 3rem 2rem;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: 2rem;
}

.hero-title {
    margin: 0;
    font-size: 3rem;
    color: var(--primary);
    line-height: 1.2;
}

.hero-description {
    margin: 0.5rem 0 0 0;
    font-size: 1.2rem;
    line-height: 1.5;
    color: var(--text);
    max-width: 600px;
}

.hero-button-shape {
    width: 140px;
    height: 48px;
    background: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #000;
    font-weight: bold;
    text-decoration: none;
    cursor: pointer;
    transition: transform 0.2s;
}

.hero-button-shape:hover {
    transform: scale(1.05);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 20px;
    border: 1px solid rgba(164, 243, 179, 0.1);
    transition: transform 0.2s;
}

.project-card:hover {
    transform: translateY(-5px);
}

.project-card h3 {
    color: var(--primary);
    margin-top: 0;
    margin-bottom: 0.5rem;
}

.tag {
    display: inline-block;
    background: rgba(164, 243, 179, 0.15);
    color: var(--primary);
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-size: 0.8rem;
    margin-right: 0.5rem;
    margin-top: 0.5rem;
}

.about-container {
    background: var(--surface);
    padding: 3rem 2rem;
    border-radius: 24px;
    text-align: center;
}

.github-link {
    display: inline-block;
    margin-top: 1.5rem;
    color: #000;
    background: var(--primary);
    padding: 0.75rem 2.5rem;
    border-radius: 100px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.2s;
}

.github-link:hover {
    transform: scale(1.05);
}

.skills-section {
    margin-top: 2.5rem;
    text-align: center;
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    margin-top: 1.5rem;
}

.skill-tag {
    background: var(--bg);
    color: var(--text);
    padding: 0.75rem 1.25rem;
    border-radius: 12px;
    font-weight: 500;
    border: 1px solid var(--primary);
}
.literature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.literature-card {
    background: var(--bg);
    padding: 1.5rem;
    border-radius: 20px;
    border: 1px solid rgba(164, 243, 179, 0.2);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: transform 0.2s;
}

.literature-card:hover {
    transform: translateY(-5px);
}

.literature-title {
    margin: 0;
    color: var(--primary);
    font-size: 1.2rem;
}

.literature-author {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.literature-link {
    display: inline-block;
    margin-top: auto;
    color: #000;
    background: var(--primary);
    padding: 0.5rem 1rem;
    border-radius: 100px;
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    align-self: flex-start;
}
.category-section {
    margin-top: 2rem;
}

.category-title {
    color: var(--primary);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid rgba(164, 243, 179, 0.2);
    padding-bottom: 0.5rem;
}
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    box-sizing: border-box;
}

.modal.active {
    display: flex;
}

.modal-container {
    background: var(--surface);
    width: 100%;
    max-width: 800px;
    max-height: 80vh;
    border-radius: 24px;
    padding: 2rem;
    position: relative;
    overflow-y: auto;
}

.modal-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: var(--primary);
    color: #000;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}
#modal-content {
    line-height: 1.6;
    color: var(--text);
    font-size: 1.1rem;
}

#modal-content h1, 
#modal-content h2, 
#modal-content h3 {
    color: var(--primary);
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

#modal-content strong {
    color: #fff;
    font-weight: 700;
}

#modal-content em {
    color: var(--text-secondary);
}
.nav-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 2rem;
    flex-wrap: wrap; 
    padding: 0 10px;
}

.tab-btn {
    padding: 10px 20px;
    border: 1px solid var(--primary);
    background: transparent;
    color: var(--primary);
    border-radius: 50px;
    cursor: pointer;
    transition: 0.3s;
    white-space: nowrap;
    font-size: 0.9rem;
}
@media (max-width: 480px) {
    .tab-btn {
        padding: 8px 15px;
        font-size: 0.8rem;
    }
    .nav-tabs {
        gap: 5px;
    }
}