/* Reset box-sizing for predictable sizing */
*, *::before, *::after {
	box-sizing: border-box;
}

html, body {
	margin: 0;
	padding: 0;
	font-family: system-ui, Arial, sans-serif;
}

img {
	max-width: 100%;
	height: auto;
	display: block;
}

:root {
	--gap: 12px;
}

.app {
	padding: 16px;
}

/* Ejercicio 1 */
.full {
	display: flex;
	justify-content: center;
	align-items: center;
	min-height: 100vh;
}

.card {
	padding: 24px;
	border: 1px solid #ddd;
	border-radius: 12px;
}

/* Ejercicio 2 */
.nav {
	display: flex;
	align-items: center;
	gap: var(--gap);
	padding: 12px 16px;
	border-bottom: 1px solid #eee;
}

.menu {
	display: flex;
	gap: var(--gap);
	justify-content: center;
	flex: 1;
}

.cta {
	padding: 8px 12px;
	border-radius: 8px;
	border: 1px solid #ddd;
	background: #fff;
}

/* Ejercicio 3 */
.cards {
	display: flex;
	flex-wrap: wrap;
	gap: var(--gap);
}

.cards .card {
	flex: 1 1 220px;
	padding: 20px;
	border: 1px solid #eee;
	border-radius: 10px;
	text-align: center;
}

/* Ejercicio 4 */
.layout {
	display: flex;
	gap: var(--gap);
	min-height: 70vh;
}

.sidebar {
	width: 240px;
	border: 1px solid #eee;
	border-radius: 12px;
	padding: 12px;
}

.content {
	flex: 1;
	border: 1px solid #eee;
	border-radius: 12px;
	padding: 16px;
}

/* Ejercicio 5 */
.pricing {
	display: flex;
	gap: 24px;
}

.price {
	font-size: 18px;
	display: flex;
	gap: 6px;
	align-items: baseline;
}

.amount {
	font-size: 48px;
	font-weight: 700;
}

/* Ejercicio 6 */
.grid3 {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: var(--gap);
}

.grid3 > * {
	border: 1px solid #eee;
	border-radius: 10px;
	padding: 16px;
	text-align: center;
}

/* Ejercicio 7 */
.page {
	display: grid;
	grid-template-columns: 240px 1fr;
	grid-template-rows: auto 1fr auto;
	gap: var(--gap);
	grid-template-areas:
		"hdr hdr"
		"sbr mn"
		"ftr ftr";
	min-height: 70vh;
}

.hdr { grid-area: hdr; }
.sbr { grid-area: sbr; }
.mn  { grid-area: mn; }
.ftr { grid-area: ftr; }

.page > * {
	border: 1px solid #eee;
	border-radius: 10px;
	padding: 12px;
}

/* Ejercicio 8 */
.auto {
	display: grid;
	gap: var(--gap);
	grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.auto .card {
	padding: 20px;
	border: 1px solid #eee;
	border-radius: 12px;
	text-align: center;
}

/* Ejercicio 9 */
.galeria {
	display: grid;
	gap: var(--gap);
	grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.galeria img {
	width: 100%;
	aspect-ratio: 1;
	object-fit: cover;
	border-radius: 12px;
}

/* Ejercicio 10 */
.hero {
	display: grid;
	place-items: center;
	min-height: 40vh;
}

.hero > * {
	grid-area: 1 / 1;
}

.hero h1 {
	background: rgba(0,0,0,.45);
	color: #fff;
	padding: 16px 24px;
	border-radius: 12px;
}

/* Ejercicio 11 */
.mf {
	display: grid;
	gap: var(--gap);
	grid-template-columns: 1fr;
}

@media (min-width: 768px) {
	.mf {
		grid-template-columns: repeat(3, 1fr);
	}
}

.mf > * {
	border: 1px solid #eee;
	border-radius: 10px;
	padding: 16px;
	text-align: center;
}

/* Ejercicio 12 */
.rnav {
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: 8px 12px;
	border-bottom: 1px solid #eee;
}

.menu-mobile nav {
	display: flex;
	flex-direction: column;
	gap: 8px;
	padding: 8px 0;
}

@media (min-width: 768px) {
	.menu-mobile > summary { display: none; }
	.menu-mobile nav { display: flex; flex-direction: row; gap: 16px; }
	.menu-mobile[open] > nav, .menu-mobile > nav { display: flex; }
}

/* Ejercicio 13 */
.title {
	font-size: clamp(1.5rem, 2.5vw + 1rem, 3rem);
	line-height: 1.15;
}

/* Ejercicio 14 */
.rf {
	display: grid;
	gap: var(--gap);
	grid-template-columns: 1fr;
	max-width: 720px;
}

.rf label {
	display: flex;
	flex-direction: column;
	gap: 6px;
}

.rf input {
	padding: 10px;
	border: 1px solid #ddd;
	border-radius: 8px;
}

.rf button {
	padding: 12px;
	border: 0;
	border-radius: 10px;
	background: #111;
	color: #fff;
}

@media (min-width: 640px) {
	.rf {
		grid-template-columns: 1fr 1fr;
	}
	.rf button {
		grid-column: 1 / -1;
	}
}