/*
	IAIBM site stylesheet
	Static, no build step. Custom properties drive color/type/spacing so
	other pages can adopt this file without duplicating values.
*/

:root {
	/* Color */
	--color-ink: #0e1a2b;
	--color-ink-muted: #4a5568;
	--color-paper: #f5f7f8;
	--color-surface: #ffffff;
	--color-teal: #0b5e59;
	--color-teal-dark: #083f3c;
	--color-violet: #6c4fe0;
	--color-line: #dce3e3;
	--color-focus: #6c4fe0;
	--color-on-ink-muted: #c7d2d9;

	/* Type */
	--font-serif: Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, serif;
	--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	--font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Consolas", "Roboto Mono", "Liberation Mono", monospace;
	--line-height: 1.6;

	/* Spacing scale */
	--space-1: 0.25rem;
	--space-2: 0.5rem;
	--space-3: 1rem;
	--space-4: 1.5rem;
	--space-5: 2rem;
	--space-6: 3rem;
	--space-7: 4rem;
	--space-8: 6rem;

	--radius: 0.5rem;
	--shadow-sm: 0 1px 3px rgba(14, 26, 43, 0.1);
	--shadow-md: 0 8px 24px rgba(14, 26, 43, 0.14);
	--max-width: 72rem;
}

/* Reset */

*, *::before, *::after {
	box-sizing: border-box;
}

html {
	scroll-behavior: smooth;
}

body {
	margin: 0;
	background: var(--color-paper);
	color: var(--color-ink);
	font-family: var(--font-sans);
	line-height: var(--line-height);
	-webkit-text-size-adjust: 100%;
}

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

a {
	color: var(--color-teal);
}

h1, h2, h3, h4 {
	font-family: var(--font-serif);
	line-height: 1.25;
	margin: 0 0 var(--space-3);
	color: var(--color-ink);
}

p {
	margin: 0 0 var(--space-3);
}

ul {
	margin: 0;
	padding: 0;
	list-style: none;
}

hr {
	border: none;
	border-top: 1px solid var(--color-line);
	margin: var(--space-6) 0;
}

table {
	border-collapse: collapse;
	width: 100%;
}

.mono {
	font-family: var(--font-mono);
	letter-spacing: 0.01em;
}

/* Visible, high-contrast focus ring everywhere */
:focus-visible {
	outline: 3px solid var(--color-focus);
	outline-offset: 2px;
}

.sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

.container {
	max-width: var(--max-width);
	margin: 0 auto;
	padding: 0 var(--space-4);
}

.button {
	display: inline-block;
	padding: 0.75em 1.5em;
	border-radius: var(--radius);
	background: var(--color-teal);
	color: #fff;
	font-weight: 600;
	text-decoration: none;
	border: 2px solid var(--color-teal);
}

.button:hover,
.button:focus-visible {
	background: var(--color-teal-dark);
	border-color: var(--color-teal-dark);
	color: #fff;
}

.button--outline {
	background: transparent;
	color: var(--color-teal);
	border: 2px solid var(--color-teal);
}

.button--outline:hover,
.button--outline:focus-visible {
	background: var(--color-teal);
	color: #fff;
}

/* Mission button sits on the dark hero; flip to a light outline there */
.hero .button--outline {
	color: #fff;
	border-color: rgba(255, 255, 255, 0.7);
}

.hero .button--outline:hover,
.hero .button--outline:focus-visible {
	background: #fff;
	color: var(--color-ink);
	border-color: #fff;
}

/* Skip link */

.skip-link {
	position: absolute;
	left: -999px;
	top: auto;
	background: var(--color-teal);
	color: #fff;
	padding: var(--space-2) var(--space-3);
	z-index: 100;
	border-radius: 0 0 var(--radius) 0;
}

.skip-link:focus {
	left: 0;
	top: 0;
}

/* ---------- Signature motif: pulse -> helix -> node graph ---------- */

.motif {
	display: block;
	width: 100%;
	height: auto;
	fill: none;
	stroke: currentColor;
	stroke-width: 3;
	stroke-linecap: round;
	stroke-linejoin: round;
}

.motif circle {
	fill: currentColor;
}

.motif--divider {
	max-width: 14rem;
	height: 1.75rem;
	color: var(--color-teal);
	margin: 0 0 var(--space-4);
	opacity: 0.9;
}

.banner .motif--divider {
	color: rgba(255, 255, 255, 0.85);
}

.motif--hero {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
	max-width: none;
	color: var(--color-on-ink-muted);
	opacity: 0.22;
	stroke-width: 2.5;
	pointer-events: none;
}

@media (prefers-reduced-motion: no-preference) {
	.motif--hero {
		animation: motif-breathe 5s ease-in-out infinite;
	}
}

@keyframes motif-breathe {
	0%, 100% { opacity: 0.16; }
	50% { opacity: 0.3; }
}

/* ---------- Header / Nav ---------- */

.site-header {
	background: var(--color-surface);
	border-bottom: 1px solid var(--color-line);
	position: sticky;
	top: 0;
	z-index: 50;
}

.site-header__bar {
	max-width: var(--max-width);
	margin: 0 auto;
	padding: var(--space-3) var(--space-4);
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-3);
}

.logo {
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
	font-family: var(--font-serif);
	font-size: 1.5rem;
	font-weight: 700;
	text-decoration: none;
	color: var(--color-ink);
}

.logo img {
	height: 2.25rem;
	width: auto;
	border-radius: var(--radius);
}

.nav-toggle {
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
	background: none;
	border: 2px solid var(--color-line);
	border-radius: var(--radius);
	padding: var(--space-2) var(--space-3);
	font: inherit;
	font-weight: 600;
	color: var(--color-ink);
	cursor: pointer;
}

.nav-toggle__icon {
	display: block;
	width: 1.25em;
	height: 2px;
	background: currentColor;
	position: relative;
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
	content: "";
	position: absolute;
	left: 0;
	width: 100%;
	height: 2px;
	background: currentColor;
}

.nav-toggle__icon::before { top: -6px; }
.nav-toggle__icon::after { top: 6px; }

/* Hidden by default only once JS confirms it can drive the toggle */
.site-nav {
	display: block;
}

.js .site-nav {
	display: none;
	position: absolute;
	left: 0;
	right: 0;
	top: 100%;
	background: var(--color-surface);
	border-bottom: 1px solid var(--color-line);
	box-shadow: var(--shadow-md);
	padding: var(--space-3) var(--space-4);
}

.js .site-nav.is-open {
	display: block;
}

.site-nav > ul {
	display: flex;
	flex-direction: column;
	gap: var(--space-1);
}

.site-nav > ul > li > a,
.site-nav__dropdown summary {
	display: block;
	padding: var(--space-2) var(--space-3);
	text-decoration: none;
	color: var(--color-ink);
	font-weight: 600;
	border-radius: var(--radius);
	cursor: pointer;
}

.site-nav > ul > li > a:hover,
.site-nav > ul > li > a:focus-visible,
.site-nav__dropdown summary:hover {
	background: var(--color-paper);
}

.site-nav > ul > li > a[aria-current="page"] {
	color: var(--color-teal);
}

.site-nav__dropdown summary {
	list-style: none;
}

.site-nav__dropdown summary::-webkit-details-marker {
	display: none;
}

.site-nav__dropdown summary::after {
	content: "▾";
	margin-left: var(--space-2);
	font-size: 0.75em;
}

.site-nav__dropdown ul {
	padding: var(--space-1) 0 var(--space-1) var(--space-4);
}

.site-nav__dropdown a {
	display: block;
	padding: var(--space-1) var(--space-3);
	text-decoration: none;
	color: var(--color-ink-muted);
	border-radius: var(--radius);
}

.site-nav__dropdown a:hover,
.site-nav__dropdown a:focus-visible {
	background: var(--color-paper);
	color: var(--color-teal);
}

@media (min-width: 56rem) {
	.nav-toggle { display: none; }

	.site-nav,
	.js .site-nav {
		display: block;
		position: static;
		box-shadow: none;
		border: none;
		padding: 0;
		background: none;
	}

	.site-nav > ul {
		flex-direction: row;
		align-items: center;
		gap: var(--space-1);
	}

	.site-nav__dropdown {
		position: relative;
	}

	.site-nav__dropdown ul {
		display: block;
		position: absolute;
		top: 100%;
		right: 0;
		left: auto;
		width: max-content;
		max-width: min(24rem, calc(100vw - 2 * var(--space-4)));
		min-width: 12rem;
		background: var(--color-surface);
		border: 1px solid var(--color-line);
		border-radius: var(--radius);
		box-shadow: var(--shadow-md);
		padding: var(--space-2);
	}
}

/* ---------- Hero / Mission banner ---------- */

.hero {
	position: relative;
	overflow: hidden;
	background: var(--color-ink);
	color: #fff;
	padding: var(--space-8) 0 var(--space-7);
	text-align: center;
}

.hero .container {
	position: relative;
	z-index: 1;
}

.hero p {
	max-width: 42rem;
	margin-left: auto;
	margin-right: auto;
	color: var(--color-on-ink-muted);
}

.hero h1 {
	font-size: clamp(1.75rem, 4vw, 2.5rem);
	color: #fff;
}

.hero .motif--divider {
	margin: var(--space-5) auto var(--space-5);
	color: var(--color-violet);
	opacity: 0.9;
}

.banner {
	background: var(--color-teal);
	color: #fff;
	padding: var(--space-7) 0;
}

.banner .container {
	max-width: 48rem;
}

.banner h2 {
	color: #fff;
}

.banner p {
	color: rgba(255, 255, 255, 0.9);
	margin: 0;
}

/* ---------- Conference grid ---------- */

.conferences {
	padding: var(--space-7) 0;
}

.conferences__intro {
	max-width: 42rem;
	margin: 0 0 var(--space-5);
}

.conference-grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: var(--space-4);
}

@media (min-width: 40rem) {
	.conference-grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (min-width: 64rem) {
	.conference-grid {
		grid-template-columns: repeat(3, 1fr);
	}
}

.conference-card {
	display: block;
	background: var(--color-surface);
	border: 1px solid var(--color-line);
	border-radius: var(--radius);
	overflow: hidden;
	text-decoration: none;
	color: inherit;
	box-shadow: var(--shadow-sm);
	transition: box-shadow 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}

.conference-card:hover,
.conference-card:focus-visible {
	box-shadow: var(--shadow-md);
	transform: translateY(-2px);
	border-color: var(--color-teal);
}

.conference-card img {
	width: 100%;
	aspect-ratio: 4 / 3;
	object-fit: cover;
}

.conference-card__body {
	padding: var(--space-3) var(--space-4) var(--space-4);
}

.conference-card__body h3 {
	font-size: 1.1rem;
	margin-bottom: var(--space-1);
}

.conference-card__body p {
	margin: 0;
	color: var(--color-ink-muted);
	font-size: 0.85rem;
}

.conference-card--tbd {
	border-style: dashed;
	box-shadow: none;
}

.conference-card--tbd .conference-card__body {
	aspect-ratio: 4 / 3;
	display: flex;
	flex-direction: column;
	justify-content: center;
	background: var(--color-paper);
}

.conference-card--tbd:hover,
.conference-card--tbd:focus-visible {
	box-shadow: none;
	border-color: var(--color-teal);
}

/* ---------- Page header (subpages) ---------- */

.page-header {
	background: var(--color-surface);
	border-bottom: 1px solid var(--color-line);
	padding: var(--space-6) 0 var(--space-5);
}

.page-header .motif--divider {
	margin-bottom: var(--space-3);
}

.page-header h1 {
	font-size: clamp(1.5rem, 3vw, 2.1rem);
	margin: 0;
}

.page-lede {
	padding: var(--space-6) 0 0;
}

.page-lede p {
	font-family: var(--font-mono);
	font-size: 0.85rem;
	letter-spacing: 0.03em;
	color: var(--color-ink-muted);
	text-transform: uppercase;
	margin: 0;
}

/* ---------- News ---------- */

.news-list {
	padding: var(--space-5) 0 var(--space-7);
}

.news-item {
	padding: var(--space-5) 0;
	border-bottom: 1px solid var(--color-line);
}

.news-item:first-child {
	padding-top: 0;
}

.news-item:last-child {
	border-bottom: none;
}

.news-item__date {
	display: block;
	font-family: var(--font-mono);
	font-size: 0.85rem;
	color: var(--color-teal);
	margin-bottom: var(--space-2);
}

.news-item h2 {
	font-size: 1.2rem;
	margin-bottom: var(--space-2);
}

.news-item p {
	margin: 0;
	color: var(--color-ink-muted);
}

/* ---------- Officers ---------- */

.officers {
	padding: var(--space-5) 0 var(--space-7);
}

.officer-grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: var(--space-4);
}

@media (min-width: 40rem) {
	.officer-grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (min-width: 64rem) {
	.officer-grid {
		grid-template-columns: repeat(3, 1fr);
	}
}

.officer-card {
	display: block;
	background: var(--color-surface);
	border: 1px solid var(--color-line);
	border-radius: var(--radius);
	overflow: hidden;
	text-decoration: none;
	color: inherit;
	box-shadow: var(--shadow-sm);
	transition: box-shadow 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}

.officer-card:hover,
.officer-card:focus-visible {
	box-shadow: var(--shadow-md);
	transform: translateY(-2px);
	border-color: var(--color-teal);
}

.officer-card img {
	width: 100%;
	aspect-ratio: 1 / 1;
	object-fit: cover;
}

.officer-card__body {
	padding: var(--space-3) var(--space-4) var(--space-4);
}

.officer-card__body h2 {
	font-size: 1rem;
	margin-bottom: var(--space-1);
}

.officer-card__body p {
	margin: 0;
	color: var(--color-ink-muted);
	font-size: 0.9rem;
	line-height: 1.5;
}

.officer-card__role {
	color: var(--color-teal);
	font-weight: 600;
}

/* ---------- Bylaw ---------- */

.bylaw {
	padding: var(--space-5) 0 var(--space-7);
	max-width: 48rem;
	margin: 0 auto;
}

.bylaw article + article {
	margin-top: var(--space-6);
	padding-top: var(--space-6);
	border-top: 1px solid var(--color-line);
}

.bylaw h2 {
	color: var(--color-teal);
	font-size: 1.1rem;
	text-transform: uppercase;
	letter-spacing: 0.02em;
}

.bylaw p {
	color: var(--color-ink-muted);
}

/* ---------- Membership ---------- */

.membership {
	background: var(--color-surface);
	border-top: 1px solid var(--color-line);
	border-bottom: 1px solid var(--color-line);
	padding: var(--space-7) 0;
}

.membership .container {
	max-width: 48rem;
}

.dues-table {
	margin: var(--space-4) 0;
	font-size: 0.95rem;
}

.dues-table th,
.dues-table td {
	border: 1px solid var(--color-line);
	padding: var(--space-2) var(--space-3);
	text-align: left;
}

.dues-table thead th {
	background: var(--color-paper);
}

.dues-table td {
	font-family: var(--font-mono);
}

.membership footer {
	margin-top: var(--space-5);
}

/* ---------- Footer ---------- */

.site-footer {
	padding: var(--space-7) 0 var(--space-6);
}

.site-footer .container {
	display: grid;
	gap: var(--space-6);
}

@media (min-width: 48rem) {
	.site-footer .container {
		grid-template-columns: 3fr 2fr;
	}
}

.footer-banner img {
	border-radius: var(--radius);
	margin-top: var(--space-3);
}

.icon-list {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-2);
	margin-top: var(--space-3);
}

.icon-list a {
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
	padding: var(--space-2) var(--space-3);
	border: 1px solid var(--color-line);
	border-radius: var(--radius);
	text-decoration: none;
	color: var(--color-ink);
	font-weight: 600;
	font-size: 0.9rem;
}

.icon-list a:hover,
.icon-list a:focus-visible {
	border-color: var(--color-teal);
	color: var(--color-teal);
}

.copyright {
	margin-top: var(--space-6);
	padding-top: var(--space-4);
	border-top: 1px solid var(--color-line);
	color: var(--color-ink-muted);
	font-size: 0.85rem;
}