:root {
    --primary-color: #5a67d8;
    --secondary-color: #a0aec0;
    --background-color: #f9fafb;
    --box-bg-color: #ffffff;
    --box-hover-bg: #ebf4ff;
    --text-color: #2d3748;
    --header-bg: #6d4c41;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--background-color);
    font-family: var(--font-family);
    color: var(--text-color);
    line-height: 1.5;
}

header {
    padding: 2rem 1rem;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
    font-weight: 700;
}

header p {
    font-size: 1.125rem;
    margin-top: 0.5rem;
    opacity: 0.85;
}

.container {
    max-width: 1200px;
    margin: 2rem auto 3rem;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.75rem;
}

.box {
    background: var(--box-bg-color);
    border-radius: 10px;
    padding: 1.75rem 1.5rem;
    box-shadow: 0 4px 10px rgb(0 0 0 / 0.05);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    border: 1px solid transparent;
}

.box:hover,
.box:focus {
    background-color: var(--box-hover-bg);
    box-shadow: 0 6px 14px rgb(102 126 234 / 0.35);
    border-color: var(--primary-color);
    outline: none;
}

.box-title {
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.box-description {
    font-size: 1rem;
    opacity: 0.8;
    flex-grow: 1;
}

.box-link {
    margin-top: 1.25rem;
    align-self: flex-start;
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 600;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.box-link:hover,
.box-link:focus {
    background: #434190;
    outline: none;
}

.logo {
    vertical-align:middle;
    margin-right:40px;
    height: 50px;
}

@media (max-width: 480px) {
    header h1 {
    font-size: 1.8rem;
    }

    header p {
    font-size: 1rem;
    }
}

.main-desc {
    text-align: justify;
    max-width: 90%;
    margin: 0 auto;
    padding: 1rem;
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--text-color);
}
.main-desc-eng {
    text-align: justify;
    max-width: 90%;
    margin: 0 auto;
    padding: 1rem;
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--text-color);
    font-style: italic;
}

footer {
    text-align: center;
    padding: 1rem;
    position: relative;
    bottom: 0;
    width: 100%;
}