:root {
    --primary: #3498db;
    --primary-dark: #2980b9;
    --bg: #f0f4f8;
    --text: #2c3e50;
    --muted: #7f8c8d;
}

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

body {
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #f0f4f8 0%, #e6ecf1 100%);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.container {
    background: white;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    padding: 3rem 2rem;
    max-width: 700px;
    width: 100%;
    text-align: center;
}

.logo {
    max-width: 200px;
    margin: 0 auto 1.5rem;
    height: auto;
}

h1 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

p.subtitle {
    font-size: 1.1rem;
    color: var(--muted);
    margin-bottom: 2rem;
}

.btn-group {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    flex: 1;
    min-width: 200px;
    max-width: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.2rem 2rem;
    border-radius: 10px;
    background-color: var(--primary);
    color: #fff;
    font-weight: 600;
    text-decoration: none;
    transition: 0.3s ease;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.btn-english {
    margin-top: 0px;
}

.btn i {
    font-size: 2.5rem;
    margin-bottom: 0.7rem;
}

.btn span {
    font-size: 0.9rem;
    font-weight: normal;
    margin-top: 0.3rem;
}

.btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.footer {
    margin-top: 2.5rem;
    font-size: 0.85rem;
    color: var(--muted);
}

@media (max-width: 500px) {
    h1 {
        font-size: 1.6rem;
    }

    .container {
        padding: 2rem 1.5rem;
    }

    .btn-group {
        flex-direction: column;
        gap: 10px;
    }

    .btn-english {
        margin-top: 10px;
    }
}