/** BASIC */

* {
	box-sizing: border-box;
}

body {
	margin: 0;
	padding: 0;
	font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
	font-size: 16px;
	line-height: 1.6;
	color: #333;
	background: #f8f9fa;
}

h1, h2, h3, h4, h5, h6 {
	font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
	font-weight: 600;
	color: #191970;
	line-height: 1.3;
	margin-top: 0;
}

h1 {
	font-size: 2.5rem;
}

h2 {
	font-size: 2rem;
}

h3 {
	font-size: 1.5rem;
}

a {
	color: #191970;
	text-decoration: none;
	transition: all 0.3s ease;
}

a:hover {
	color: #4169E1;
	text-decoration: none;
}

/** HEADER */

#header {
	padding: 2.5rem 2rem;
	background: linear-gradient(135deg, #E6E6FA 0%, #D8D8F6 100%);
	border-bottom: none;
	box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

#header h1 {
	margin: 0;
	padding: 0;
	text-align: center;
	font-weight: 700;
	letter-spacing: 0.05em;
	color: #191970;
	font-size: 2.5rem;
}

#header h2 {
	margin: 0.5rem 0 0 0;
	padding: 0;
	text-align: center;
	font-weight: 400;
	font-size: 1.1rem;
	letter-spacing: 0.1em;
	color: #4a4a8a;
	opacity: 0.9;
}

/** MENU */

#menu {
	padding: 0;
	background: #fff;
	border-bottom: 1px solid #e0e0e0;
	text-align: center;
	box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
	position: sticky;
	top: 0;
	z-index: 100;
}

#menu ul {
	margin: 0;
	padding: 0;
	list-style: none;
	display: flex;
	justify-content: center;
	flex-wrap: wrap;
}

#menu li {
	display: inline-block;
}

#menu a {
	display: inline-block;
	padding: 1rem 1.5rem;
	text-decoration: none;
	font-weight: 500;
	color: #191970;
	position: relative;
	transition: all 0.3s ease;
}

#menu a::after {
	content: '';
	position: absolute;
	bottom: 0;
	left: 50%;
	transform: translateX(-50%);
	width: 0;
	height: 3px;
	background: #191970;
	transition: width 0.3s ease;
}

#menu a:hover {
	background: transparent;
	color: #191970;
}

#menu a:hover::after {
	width: 80%;
}

/** CONTENT */

#content {
	max-width: 900px;
	width: 100%;
	margin: 3rem auto;
	padding: 2rem;
}

#columnA {
	float: none;
	width: 100%;
	text-align: justify;
	background: #fff;
	padding: 2.5rem;
	border-radius: 12px;
	box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
}

/** FOOTER */

#footer {
	clear: both;
	padding: 2rem;
	background: linear-gradient(135deg, #ADD8E6 0%, #B8E0F0 100%);
	border-top: none;
	border-bottom: none;
	text-align: center;
	margin-top: 4rem;
	box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.05);
}

#footer p {
	margin: 0;
	padding: 0.5rem;
	color: #191970;
	font-size: 0.95rem;
}

/** DETAILS/ACCORDION */

details {
	border: 1px solid #e0e0e0;
	border-radius: 8px;
	padding: 1rem 1.25rem;
	margin-bottom: 1rem;
	background: #fff;
	transition: all 0.3s ease;
}

details > details {
	padding-top: 1rem;
	margin: 1rem 0 0 0;
	background: #f8f9fa;
}

details:hover:not([open]) {
	background-color: #f8f9fa;
	box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
	border-color: #c0c0c0;
}

details[open] {
	box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
	border-color: #191970;
}

details[open] > summary {
	color: #191970;
	margin-bottom: 1rem;
	padding-bottom: 1rem;
	border-bottom: 1px solid #e0e0e0;
}

.summary {
	cursor: pointer;
	font-weight: 600;
	user-select: none;
	-webkit-user-select: none;
	color: #4a4a8a;
	transition: color 0.3s ease;
	font-size: 1.05rem;
}

.summary:hover {
	color: #191970;
}

/** RESPONSIVE DESIGN */

@media screen and (max-width: 768px) {
	#header {
		padding: 1.5rem 1rem;
	}
	
	#header h1 {
		font-size: 1.8rem;
	}
	
	#header h2 {
		font-size: 1rem;
	}
	
	#menu a {
		padding: 0.8rem 1rem;
		font-size: 0.9rem;
	}
	
	#content {
		margin: 1.5rem auto;
		padding: 1rem;
	}
	
	#columnA {
		padding: 1.5rem;
	}
}

@media screen and (max-width: 480px) {
	#header h1 {
		font-size: 1.5rem;
	}
	
	#menu ul {
		flex-direction: column;
	}
	
	#menu a {
		display: block;
		padding: 0.8rem;
		border-bottom: 1px solid #f0f0f0;
	}
	
	#menu a::after {
		display: none;
	}
}