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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.7;
    color: #1a1a1a;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    min-height: 100vh;
    letter-spacing: -0.01em;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 2rem;
    background-color: rgba(255, 255, 255, 0.95);
    min-height: 100vh;
    backdrop-filter: blur(10px);
    border-left: 1px solid rgba(255, 255, 255, 0.2);
    border-right: 1px solid rgba(255, 255, 255, 0.2);
}

header {
    text-align: center;
    margin-bottom: 4rem;
    padding-bottom: 3rem;
    position: relative;
}

header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, #000, transparent);
}

header h1 {
    font-size: 4rem;
    font-weight: 100;
    color: #000;
    margin-bottom: 1rem;
    letter-spacing: 8px;
    text-transform: uppercase;
}

.subtitle {
    font-size: 0.9rem;
    color: #666;
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.tab-navigation {
    display: flex;
    justify-content: center;
    margin-bottom: 3rem;
    gap: 0;
}

.tab-btn {
    background: none;
    border: none;
    padding: 1.2rem 2.5rem;
    font-size: 0.85rem;
    color: #999;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 400;
    letter-spacing: 1px;
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
}

.tab-btn::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: #000;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab-btn:hover {
    color: #000;
}

.tab-btn:hover::before {
    width: 100%;
}

.tab-btn.active {
    color: #000;
    font-weight: 500;
}

.tab-btn.active::before {
    width: 100%;
}

.content {
    min-height: 500px;
}

.tab-content {
    display: none;
    animation: fadeIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tab-content h2 {
    font-size: 1.8rem;
    color: #000;
    margin-bottom: 3rem;
    font-weight: 200;
    text-align: center;
    letter-spacing: 3px;
    text-transform: uppercase;
}

.grade-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    margin-bottom: 0;
    background: none;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.grade-item:hover {
    padding-left: 1rem;
    background: rgba(0, 0, 0, 0.01);
}

.grade-item h3 {
    font-size: 1rem;
    color: #333;
    font-weight: 400;
    letter-spacing: 0.5px;
}

.grade {
    font-size: 1.1rem;
    font-weight: 600;
    color: #000;
    background: none;
    padding: 0;
    border-radius: 0;
    box-shadow: none;
    min-width: 30px;
    text-align: right;
}

.activity-item, .hobby-item {
    margin-bottom: 2.5rem;
    padding: 2rem 0;
    background: none;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.activity-item:last-child, .hobby-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.activity-item:hover, .hobby-item:hover {
    padding-left: 1rem;
    background: rgba(0, 0, 0, 0.01);
}

.activity-item h3, .hobby-item h3 {
    font-size: 1.1rem;
    color: #000;
    margin-bottom: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.activity-item p, .hobby-item p {
    color: #666;
    line-height: 1.7;
    font-size: 0.95rem;
}

#about {
    text-align: center;
    padding: 4rem 2rem;
}

#about h2 {
    margin-bottom: 2rem;
}

#about p {
    font-size: 1.2rem;
    color: #333;
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.8;
    font-weight: 300;
}

@media (max-width: 768px) {
    .container {
        padding: 2rem 1.5rem;
    }
    
    header h1 {
        font-size: 2.5rem;
        letter-spacing: 4px;
    }
    
    .tab-navigation {
        flex-wrap: wrap;
        gap: 0;
    }
    
    .tab-btn {
        padding: 1rem 1.5rem;
        font-size: 0.8rem;
    }
    
    .grade-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
        padding: 1.2rem 0;
    }
    
    .grade {
        text-align: left;
    }
    
    #about {
        padding: 3rem 1rem;
    }
}