header {
	border-bottom: 1px solid;
	border-image: linear-gradient(to right, var(--liukuvari-alku), var(--liukuvari-loppu));
	border-image-slice: 1;
}

body {
	margin: 0;
	padding: 0;
	font-family: var(--leipateksti-fontti), var(--leipateksti-fallback);
	  font-weight: var(--leipateksti-fontti-weight);
	line-height: 1.6;
	color: var(--teksti-vari);
	background-color: var(--tausta-vari);
	min-height: 100vh;
}

.tausta-kontaineri {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background-image: url('/bin/tausta.gif');
	background-size: cover;
	background-position: center top;
	background-attachment: fixed;
	overflow-y: auto;
}

.sisalto-kääre {
	max-width: 925px;
	margin: 0 auto;
	padding: 20px;
	position: relative;
	background-color: rgba(26, 26, 26, 0.85);
	backdrop-filter: blur(5px);
	min-height: 100vh;
	box-sizing: border-box;
}

h1, h2, h3, h4, h5, h6 {
	font-family: var(--otsikko-fontti);
	word-wrap: break-word;
	background: linear-gradient(to right, var(--liukuvari-alku), var(--liukuvari-loppu));
	-webkit-background-clip: text;
	background-clip: text;
	color: transparent;
	font-weight: 400;
}

h1 {
	font-size: 2.5em;
	margin-top: 0.5em;
}

h2 {
	font-size: 2em;
	padding-bottom: 0.3em;
}

h3 {
	font-size: 1.7em;
	margin-top: 1.5em;
}


img {
	max-width: 100%;
	height: auto;
	margin: 1em 0;
	border: 1px solid #333;
	border-radius: 4px;
}

pre {
	background: #2d2d2d;
	padding: 1em;
	border-radius: 5px;
	overflow-x: auto;
	border: 1px solid #333;
	font-size: 0.9em;
}

code {
	font-family: 'Courier New', Courier, monospace;
	font-size: 0.9em;
	color: var(--korostevari);
	word-wrap: break-word;
}

#sisalto {
	margin: 20px 0;
	overflow-wrap: break-word;
	position: relative;
	z-index: 1;
}

footer {
	margin-top: 50px;
	padding: 20px 0;
	color: var(--kakkos-vari);
	border-top: 1px solid;
	border-image: linear-gradient(to right, var(--liukuvari-alku), var(--liukuvari-loppu));
	border-image-slice: 1;
	font-size: 0.9em;
	font-family: var(--kakkos-fontti);
}

a {
	color: var(--korostevari);
	text-decoration: none;
	transition: all 0.3s ease;
	word-wrap: break-word;
}

a:hover {
	text-decoration: underline;
}

blockquote {
	border-left: 3px solid var(--korostevari);
	margin: 1em 0;
	padding-left: 1em;
	color: #b0b0b0;
}

table {
	border-collapse: collapse;
	width: 100%;
	margin: 1em 0;
	overflow-x: auto;
	display: block;
}

th, td {
	border: 1px solid #333;
	padding: 8px;
	text-align: left;
}

th {
	background-color: #2d2d2d;
}

ul, ol {
	margin: 1em 0;
	padding-left: 2em;
}

li {
	margin: 0.5em 0;
}

.otsikon-navigaatio {
	margin-top: -10px;
	margin-bottom: 10px;
	display: flex;
	align-items: center;
	font-family: var(--kakkos-fontti);
	font-size: 1.4em;
	border-bottom: 1px solid var(--korostevari);
	padding-bottom: 15px;
}

.nav-link {
	text-decoration: none;
	color: var(--teksti-vari);
	margin: 0 5px;
	transition: all 0.3s ease;
}

.nav-link:hover {
	text-decoration: underline;
	color: var(--korostevari);
}

.nav-link.active {
	text-decoration: underline;
	font-weight: bold;
}

.nav-separator {
	color: #666;
	margin: 0 5px;
}

.nav-arrow {
	color: #666;
	margin-left: 10px;
}

header {
	border-bottom: none;
}

header h1 {
	margin-bottom: 10px;
}


/* Media queryt responsiivisuutta varten */
@media (max-width: 1024px) {
	.sisalto-kääre {
		max-width: 80%;
	}
}

@media (max-width: 768px) {
	.sisalto-kääre {
		max-width: 90%;
		padding: 15px;
	}
	
	h1 {
		font-size: 1.8em;
	}
	
	h2 {
		font-size: 1.5em;
	}
	
	h3 {
		font-size: 1.2em;
	}
	
	.tehtava-otsikko {
		flex-direction: column;
	}
	
	.tehtava-lista {
		margin-bottom: 15px;
	}
	
	.seuraava-tehtava {
		margin-left: 0;
	}
}

@media (max-width: 480px) {
	.sisalto-kääre {
		max-width: 100%;
		padding: 10px;
	}
	
	.tehtava-lista {
		justify-content: center;
	}
	
	pre {
		padding: 0.7em;
	}
	
	code {
		font-size: 0.85em;
	}
	
	.kurssi-lista li {
		padding: 8px;
	}
}

footer {
	display: flex;
	justify-content: space-between;
	align-items: center;
}

.footer-nav {
	margin-left: auto;
	font-family: var(--kakkos-fontti);
}

.footer-link {
	color: var(--korostevari);
	text-decoration: none;
	transition: all 0.3s ease;
}

.footer-link:hover {
	text-decoration: underline;
}

.footer-separator {
	color: #666;
	margin: 0 5px;
}

@media (max-width: 768px) {
	footer {
		flex-direction: column;
		text-align: center;
	}
	
	.footer-nav {
		margin: 15px auto 0 auto;
	}
}