:root {
    --bg-color: #fcfbf7;
    --text-main: #2b2b2b;
    --text-muted: #5e5e5e;
    --accent-color: #1a1a1a;
    --accent-hover: #d97706;
    --border-color: #e5e5e5;
    --font-stack: "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-stack);
    line-height: 1.7;
    padding: 60px 20px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 760px;
    margin: 0 auto;
    width: 100%;
    flex: 1;
}

.profile-header {
    display: flex;
    align-items: flex-start;
    gap: 35px;
    padding-bottom: 45px;
    margin-bottom: 45px;
    border-bottom: 1px dashed var(--border-color);
}

.avatar-container {
    flex-shrink: 0;
}

.profile-img {
    width: 135px;
    height: 135px;
    border-radius: 12px;
    object-fit: cover;
    filter: grayscale(10%);
}

.profile-title h1 {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--accent-color);
    margin-bottom: 5px;
    letter-spacing: -0.03em;
}

.subtitle {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 18px;
}

.profile-actions {
    display: flex;
    align-items: center;
    gap: 25px;
}

.icon-link {
    color: var(--text-main);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.2s ease-in-out;
}

.cv-link {
    gap: 8px;
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    background-color: transparent;
}

.github-link {
    width: 38px;
    height: 38px;
}

.icon-link:hover {
    color: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-2px);
}

.about-section {
    margin-bottom: 60px;
}

h2 {
    font-family: var(--font-mono);
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 25px;
}

.about-text p {
    margin-bottom: 20px;
    font-size: 1.05rem;
    color: var(--text-main);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 20px;
}

.tech-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 15px 10px;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.tech-card:hover {
    border-bottom: 2px solid var(--accent-hover);
    transform: translateY(-3px);
}

.tech-card i {
    font-size: 2.2rem;
}

.simple-icon {
    width: 2.2rem;
    height: 2.2rem;
    object-fit: contain;
}

.tech-txt-icon {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: bold;
    width: 2.2rem;
    height: 2.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    background-color: transparent;
}

.xgboost-badge {
    color: #ff6f00;
    border: 1px solid #ff6f00;
}

.tech-card span {
    font-size: 0.85rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
}

.footer {
    text-align: left;
    padding: 30px 0;
    font-family: var(--font-mono);
    color: #a3a3a3;
    font-size: 0.8rem;
    border-top: 1px dashed var(--border-color);
    margin-top: auto;
}

@media (max-width: 600px) {
    .profile-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 20px;
    }
    
    .profile-actions {
        justify-content: center;
    }
    
    .tech-grid {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
        gap: 10px;
    }
    
    .footer {
        text-align: center;
    }
}