@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;600;700&display=swap');

/* Theme colors are centralized here so the page can be adjusted from one place. */
:root {
	--page-bg: #f4f7ff;
	--card-bg: hsl(210, 60%, 98%);
	--brand-accent: rgb(38, 80, 195);
	--soft-highlight: rgba(38, 80, 195, 0.14);
	--body-text: color(display-p3 0.14 0.18 0.24 / 0.96);
	--mix-border: color-mix(in srgb, #1a73e8 65%, white 35%);
}

* {
	box-sizing: border-box;
}

body {
	margin: 0;
	padding: 1.25rem;
	font-family: 'Space Grotesk', sans-serif;
	color: var(--body-color, #1f2937);
	background-color: var(--page-bg);
	background-image: linear-gradient(120deg, #f4f7ff 0%, #eef6ff 45%, #f8fbff 100%);
}

header {
	position: sticky;
	top: 0;
	z-index: 10;
	background-color: var(--card-bg);
	padding: 0.75rem 1rem;
	border-style: solid;
	border-color: var(--mix-border);
	border-width: 2px;
	border-radius: 12px;
}

h1 {
	margin: 0.25rem 0 0.35rem 0;
	color: var(--brand-accent);
	text-align: center;
	text-decoration: underline;
}

header h2 {
	display: inline;
	margin-right: 1em;
	color: navy;
	font-size: 1rem;
}

nav {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	align-items: center;
	gap: 0.5rem;
	margin-top: 0.7rem;

    /* Nested selectors: anchor inside the nav */
	& a {
		display: inline-block;
		color: var(--brand-accent);
		text-decoration: none;
		padding: 0.45rem 0.7rem;
		border-style: solid;
		border-width: 1px;
		border-color: rgba(38, 80, 195, 0.3);
		border-radius: 999px;
		background-color: var(--soft-highlight);
	}
}

nav a:hover {
	background-color: color-mix(in srgb, rgb(38, 80, 195) 22%, white 78%);
	text-decoration: underline;
}

nav a:active {
	background-color: hsla(223, 67%, 46%, 0.28);
}

main {
	width: 92vw;
	max-width: 20cm;
	min-width: 320px;
	margin: 1.25rem auto;
	padding: 1rem;
	background-color: #ffffff;
	border-style: solid;
	border-width: 2px;
	border-color: #d7e1f3;
	border-radius: 1rem;
}

/* Offset in-page anchors so sticky header does not cover the jumped-to heading. */
h2[id] {
	scroll-margin-top: 10rem;
}

#section-media {
	background-color: #ccd2e2;
}

section {
	margin: 1rem 0;
	padding: 0.85rem 0.9rem;
}

section h2 {
	color: rgb(28, 49, 94);
	text-align: left;
	margin-top: 0;
}

section:has(audio),
section:has(video) {
	border-style: solid;
	border-width: 1px;
	border-color: #d7e1f3;
	border-radius: 0.85rem;
}

p {
	line-height: 1.5;
	margin-bottom: 0.8rem;
}

img,
video {
	display: block;
	width: 100%;
	height: auto;
	max-width: 100%;
	margin: 0.7rem 0;
	border-style: solid;
	border-width: 1px;
	border-color: #c6d4ec;
	border-radius: 0.65rem;
}

audio {
	display: block;
	width: 100%;
	max-width: 100%;
	height: 2.75rem;
	margin: 0.7rem 0;
}

video {
	min-width: 260px;
}

datalist {
	display: none;
}

fieldset {
	display: grid;
	grid-template-columns: 1fr;
	grid-auto-rows: auto;
	gap: 0.85rem;
	align-items: center;
	padding: 1rem;
	padding-left: 1.2rem;
	border-style: solid;
	border-width: 2px;
	border-color: hsl(216, 48%, 80%);
	border-radius: 10px;
	margin: 0.5rem 0;
}

/* The form uses helper wrappers to keep labels, controls, and option groups aligned. */
legend {
	color: #2646a3;
	font-weight: 700;
	padding: 0 0.4rem;
}

label,
input,
select,
textarea,
button {
	font-size: 11pt;
}

input[type='text'],
input[type='date'],
select,
textarea {
	width: 100%;
	padding: 0.45rem;
	border-style: solid;
	border-width: 1px;
	border-color: #bdcbe6;
	border-radius: 6px;
}

.form-row {
	display: grid;
	grid-template-columns: minmax(10rem, 15rem) 1fr;
	gap: 0.75rem;
	align-items: center;
}

.form-row > label {
	margin: 0;
}

.form-row-stack {
	grid-template-columns: 1fr;
}

.form-group {
	display: grid;
	gap: 0.45rem;
	padding: 0.45rem 0.5rem;
	border-style: solid;
	border-width: 1px;
	border-color: #d7e1f3;
	border-radius: 8px;
	background-color: #f9fbff;
}

/* Combined selector: paragraph with class form-group-title */
p.form-group-title {
	margin: 0 0 0.2rem;
	font-weight: 600;
	color: #1c315e;
	text-transform: uppercase;
	letter-spacing: 0.03em;
}

.choice {
	display: flex;
	align-items: center;
	gap: 0.55rem;
	margin: 0;
}

.choice input {
	margin: 0;
	width: auto;
}

.form-actions {
	display: flex;
	justify-content: flex-start;
}

/* Adjacent sibling selector: tighten spacing after headings in content sections. */
section h3 + p {
	margin-top: 0.2rem;
}

/* General sibling selector: keep later paragraphs in a section slightly tighter. */
section h3 ~ p {
	margin-bottom: 0.55rem;
}

footer p {
	margin-top: 0.25rem;
	margin-right: 0.5rem;
	margin-bottom: 0.25rem;
	margin-left: 0.5rem;
	padding-top: 0.15rem;
	padding-right: 0.2rem;
	padding-bottom: 0.15rem;
	padding-left: 0.2rem;
}

button,
input[type='submit'] {
	background-color: #1f4fc7;
	color: white;
	border-style: solid;
	border-width: 1px;
	border-color: #12327f;
	border-radius: 0.45rem;
	padding: 0.55rem 0.9rem;
	cursor: pointer;
}

button:hover,
input[type='submit']:hover {
	background-color: hsl(223, 77%, 38%);
}

button:active,
input[type='submit']:active {
	background-color: rgb(18, 52, 127);
}

footer {
	position: relative;
	margin-top: 1rem;
	text-align: center;
	color: #3b4e79;
	letter-spacing: 0.5pt;
}

footer p {
	font-style: italic;
}

/* On smaller screens, the layout switches to a single-column flow for readability. */
@media screen and (max-width: 760px) {
	body {
		padding: 0.75rem;
	}

	header {
		position: relative;
	}

	header h2 {
		display: block;
		margin-right: 0;
	}
    
    h2[id] {
        scroll-margin-top: 1rem;
    }

	main {
		width: 100%;
		min-width: 0;
		padding: 0.75rem;
	}

	fieldset {
		padding-left: 1rem;
	}

	.form-row {
		grid-template-columns: 1fr;
		gap: 0.4rem;
	}

	nav {
		justify-content: flex-start;
	}
}