:root {
    --primary-color: #2A9D8F;
    --secondary-color: #264653;
    --accent-color: #E9C46A;
    --text-color: #2C3E50;
    --light-bg: #F8F9FA;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

.tutor-portrait {
    text-align: center;
    padding: 2rem;
}

.portrait-image {
    max-width: 400px;
    width: 400px;
    height: 400px;
    border: 8px solid var(--light-bg);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    object-fit: cover;
}

.portrait-placeholder {
    background-color: var(--light-bg);
    padding: 2rem;
}

.portrait-image:hover {
    transform: scale(1.02);
}

.hero-content {
    padding: 2rem;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-color);
    margin: 1.5rem 0;
}

.cta-buttons {
    margin-top: 2rem;
}

header {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-weight: bold;
    color: var(--primary-color) !important;
    font-size: 1.5rem;
    margin: 0;
    padding: 0;
}

.hero {
    background: linear-gradient(135deg, var(--light-bg) 0%, #E8F6F8 100%);
    padding: 80px 0;
    margin-top: 56px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: bold;
    color: #2c3e50;
    margin-bottom: 1.5rem;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 12px 30px;
    font-weight: 600;
    transition: all 0.3s ease;
    color: white;
}

.btn-outline-primary {
    border-color: var(--primary-color);
    color: var(--primary-color);
    padding: 12px 30px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #357abd;
    border-color: #357abd;
    transform: translateY(-2px);
}

.card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

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

.card-title {
    color: var(--primary-color);
    font-weight: bold;
    margin-bottom: 1rem;
}

#about {
    background-color: var(--secondary-color);
}

#about ul li {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

form .form-control {
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid #ddd;
}

form .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(74, 144, 226, 0.25);
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero {
        text-align: center;
        padding: 60px 0;
    }
}