/*
 * Rill — design tokens & site shell.
 *
 * THE RULE THIS FILE EXISTS TO ENFORCE: #rl-water is a fixed, full-viewport
 * WebGL2 canvas that persists behind every section on every page — a real
 * shallow-water simulation, never rebuilt per-section. Every element with
 * class="glass" performs genuine backdrop-filter refraction of that live
 * water plus an inner glow whose intensity (--rl-glow, set by water.js from
 * the actual simulated height under that element) is coupled to the real
 * simulation state, not merely decorative CSS.
 */

:root {
	--ink: #0A1B22;
	--ink-2: #0F2530;
	--paper: #F4FAFB;
	--paper-2: #E7F1F3;
	--surface: rgba(10, 27, 34, 0.04);
	--surface-strong: rgba(10, 27, 34, 0.08);
	--line: rgba(10, 27, 34, 0.12);
	--line-on-dark: rgba(244, 250, 251, 0.14);
	--text: #12292F;
	--text-soft: #4C6A70;
	--text-faint: #7B9499;
	--text-on-dark: #F4FAFB;
	--text-on-dark-soft: #AFC9CE;

	--water: #2CA6AE;
	--water-deep: #1B7C86;
	--foam: #E8FBFA;

	--accent: #C17A45;
	--accent-deep: #A2632F;

	--glow-rgb: 120, 224, 232;

	--font-display: 'Newsreader', Georgia, serif;
	--font-sans: 'Space Grotesk', -apple-system, 'Segoe UI', sans-serif;
	--font-mono: 'Spline Sans Mono', ui-monospace, monospace;

	--fs-1: 1rem;
	--fs-2: 1.25rem;
	--fs-3: 1.5625rem;
	--fs-4: 1.953rem;
	--fs-5: 2.441rem;
	--fs-6: clamp(2.1rem, 1.3rem + 4.5vw, 3.6rem);
	--fs-7: clamp(2.3rem, 1.2rem + 6vw, 4.9rem);

	--sp-1: 4px;
	--sp-2: 8px;
	--sp-3: 16px;
	--sp-4: 24px;
	--sp-5: 40px;
	--sp-6: 64px;
	--sp-7: 96px;
	--sp-8: 144px;

	--radius: 14px;
	--radius-sm: 8px;
	--wrap: 1280px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
	margin: 0;
	font-family: var(--font-sans);
	background: var(--paper);
	color: var(--text);
	-webkit-font-smoothing: antialiased;
	line-height: 1.55;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 500; line-height: 1.12; margin: 0 0 var(--sp-3); letter-spacing: -0.01em; }
h1 { font-size: var(--fs-7); }
h2 { font-size: var(--fs-5); }
h3 { font-size: var(--fs-3); }
p { margin: 0 0 var(--sp-3); color: var(--text-soft); }

.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; }

/* ---------- Persistent water background ---------- */
#rl-water { position: fixed; inset: 0; z-index: -2; pointer-events: none; }
#rl-water canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--sp-4); position: relative; z-index: 1; }
.wrap--narrow { max-width: 760px; }

/* ---------- Glass (the signature material) ---------- */
.glass {
	--rl-glow: 0;
	position: relative;
	background: rgba(244, 250, 251, 0.42);
	backdrop-filter: blur(20px) saturate(150%);
	-webkit-backdrop-filter: blur(20px) saturate(150%);
	border: 1px solid rgba(255, 255, 255, 0.5);
	border-radius: var(--radius);
	box-shadow:
		inset 0 0 calc(10px + var(--rl-glow) * 26px) rgba(var(--glow-rgb), calc(0.20 + var(--rl-glow) * 0.45)),
		inset 0 1px 0 rgba(255,255,255,0.6),
		0 24px 48px -28px rgba(6, 30, 36, 0.35);
	transition: box-shadow 260ms ease, transform 200ms ease, border-color 200ms ease;
}
.glass:hover { border-color: rgba(255,255,255,0.75); transform: translateY(-2px); }
.glass--dark {
	background: rgba(10, 27, 34, 0.38);
	border-color: rgba(255,255,255,0.16);
	color: var(--text-on-dark);
}
.glass--dark p { color: var(--text-on-dark-soft); }

/* ---------- Header ---------- */
.site-header { position: sticky; top: 0; z-index: 40; padding: var(--sp-2) 0; }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-4); padding: 10px var(--sp-4); }
.brand { font-family: var(--font-display); font-size: 1.5rem; font-weight: 600; display: flex; align-items: baseline; gap: 10px; }
.brand__tag { font-family: var(--font-mono); font-size: 0.6875rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.08em; font-weight: 400; }
.nav ul { list-style: none; display: flex; gap: var(--sp-5); margin: 0; padding: 0; }
.nav a { font-size: 0.9375rem; color: var(--text-soft); transition: color 160ms ease; }
.nav a:hover { color: var(--water-deep); }

.nav-toggle {
	display: none; background: none; border: 1px solid var(--line); border-radius: var(--radius-sm);
	color: var(--text); padding: 0.5em 0.9em; font-size: 0.9rem; cursor: pointer;
}
@media (max-width: 860px) {
	.nav-toggle { display: inline-flex; }
	/* .site-header's backdrop-filter -- and, worse, a lingering .glass:hover
	   transform left active on touch devices after tapping the toggle button
	   (a descendant, so :hover matches the header too) -- otherwise creates a
	   containing block for .nav's position:fixed panel (same effect as
	   `transform` on any ancestor), trapping it inside the header's own
	   ~68px box instead of the viewport. transform:none needs !important to
	   reliably beat .glass:hover's transform at equal specificity. */
	.site-header.nav-open { backdrop-filter: none; -webkit-backdrop-filter: none; background: var(--paper); transform: none !important; }
	.nav {
		position: fixed; inset: 68px 0 0 0; background: var(--paper); padding: var(--sp-5) var(--sp-4);
		transform: translateY(-8px); opacity: 0; pointer-events: none;
		transition: opacity 220ms ease, transform 220ms ease; overflow-y: auto; z-index: 39;
	}
	.nav.is-open { opacity: 1; transform: none; pointer-events: auto; }
	.nav ul { flex-direction: column; align-items: flex-start; gap: var(--sp-4); }
	.nav a { font-size: 1.25rem; }
	.brand__tag { display: none; }
	.site-header__inner { padding: var(--sp-2) var(--sp-3); gap: var(--sp-2); }
	.site-header__inner > div { gap: var(--sp-2) !important; }
	.btn.btn--solid { padding: 0.6em 0.85em; font-size: 0.75rem; }
	.nav-toggle { padding: 0.5em 0.7em; font-size: 0.78rem; }
	.grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ---------- Buttons ---------- */
.btn {
	display: inline-flex; align-items: center; gap: 8px; padding: 0.85em 1.5em; border-radius: 999px;
	font-family: var(--font-sans); font-size: 0.875rem; font-weight: 500; border: 1px solid var(--line);
	background: transparent; color: var(--text); cursor: pointer; transition: all 180ms ease;
}
.btn:hover { border-color: var(--water); color: var(--water-deep); }
.btn--solid { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn--solid:hover { background: var(--accent-deep); border-color: var(--accent-deep); color: #fff; }
.btn--on-dark { background: rgba(244,250,251,0.1); color: var(--text-on-dark); border-color: var(--line-on-dark); }
.btn--on-dark:hover { background: rgba(244,250,251,0.18); border-color: rgba(255,255,255,0.4); }

.eyebrow { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-mono); font-size: 0.8125rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--water-deep); margin-bottom: var(--sp-3); }
.eyebrow::before { content: ''; width: 22px; height: 1px; background: var(--water); }
.eyebrow--on-dark { color: var(--foam); }
.eyebrow--on-dark::before { background: var(--foam); }

/* ---------- Grid / card ---------- */
.grid { display: grid; gap: var(--sp-5); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.card { display: block; padding: var(--sp-4); }
.card__media { aspect-ratio: 4/3; border-radius: var(--radius-sm); overflow: hidden; margin-bottom: var(--sp-4); background: var(--surface); }
.card__media--rule { background: linear-gradient(135deg, var(--water) 0%, var(--water-deep) 55%, var(--ink-2) 100%); position: relative; }
.card__media--rule::after { content: ''; position: absolute; inset: 0; background: repeating-linear-gradient(115deg, rgba(255,255,255,0.12) 0 2px, transparent 2px 26px); }
.card__media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card__eyebrow { font-family: var(--font-mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--water-deep); margin-bottom: var(--sp-2); }
.card__title { margin-bottom: var(--sp-2); }
.card__excerpt { color: var(--text-soft); font-size: 0.9375rem; margin-bottom: 0; }

.section-head { max-width: 640px; margin-bottom: var(--sp-6); }
.pull-quote { font-family: var(--font-display); font-style: italic; font-size: var(--fs-4); line-height: 1.3; max-width: 900px; }
.pull-quote cite { display: block; margin-top: var(--sp-4); font-family: var(--font-mono); font-size: 0.875rem; font-style: normal; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.05em; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: var(--sp-8) 0 var(--sp-7); min-height: 92vh; display: flex; align-items: center; }
.hero__inner { position: relative; z-index: 2; max-width: 900px; }
.hero__panel { padding: var(--sp-6); max-width: 720px; }
.hero__lede { font-size: var(--fs-2); max-width: 46ch; font-family: var(--font-sans); color: var(--text-soft); }
.hero__actions { display: flex; gap: var(--sp-3); margin-top: var(--sp-5); flex-wrap: wrap; }
.hero__stats { display: flex; gap: var(--sp-6); margin-top: var(--sp-7); flex-wrap: wrap; }
.hero__stat-num { font-family: var(--font-mono); font-weight: 700; font-size: var(--fs-4); color: var(--water-deep); }
.hero__stat-label { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.08em; }

/* ---------- Footer ---------- */
.site-footer { margin-top: var(--sp-8); padding: var(--sp-7) 0 var(--sp-5); background: var(--ink); color: var(--text-on-dark); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: var(--sp-6); margin-bottom: var(--sp-7); }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-grid h4 { font-size: 0.8125rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-on-dark-soft); font-family: var(--font-mono); font-weight: 500; margin-bottom: var(--sp-3); }
.footer-grid ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-grid a, .footer-grid p { color: var(--text-on-dark-soft); font-size: 0.9375rem; }
.footer-grid .brand { color: var(--text-on-dark); }
.footer-legal { display: flex; justify-content: space-between; padding-top: var(--sp-5); border-top: 1px solid var(--line-on-dark); font-size: 0.8125rem; color: var(--text-on-dark-soft); flex-wrap: wrap; gap: var(--sp-2); }

/* ---------- Forms ---------- */
.enquiry-form input, .enquiry-form textarea, .enquiry-form select {
	width: 100%; padding: 12px 14px; border-radius: var(--radius-sm); border: 1px solid var(--line);
	background: rgba(255,255,255,0.6); font-family: var(--font-sans); font-size: 0.9375rem; margin-bottom: var(--sp-3);
}
.enquiry-form input:focus, .enquiry-form textarea:focus { outline: 2px solid var(--water); outline-offset: 1px; }
.enquiry-form__status { font-size: 0.875rem; color: var(--text-soft); }
.enquiry-form__status.is-error { color: var(--accent-deep); }

/* ---------- Focus visibility (keyboard navigation) ---------- */
a:focus-visible, button:focus-visible, .btn:focus-visible, .nav-toggle:focus-visible {
	outline: 2px solid var(--water-deep);
	outline-offset: 2px;
	border-radius: 4px;
}

/* ---------- Inner page head ---------- */
.page-head { padding: var(--sp-6) 0; background: var(--paper-2); border-bottom: 1px solid var(--line); }
.page-head h1 { font-size: var(--fs-6); }
.page-head__inner { display: flex; justify-content: space-between; align-items: flex-end; gap: var(--sp-6); flex-wrap: wrap; }
.page-head__intro { max-width: 640px; }
.page-head__stats { display: flex; gap: var(--sp-6); flex: 0 0 auto; }
.page-head__stats .about-stats__num { font-size: var(--fs-5); }
@media (max-width: 720px) { .page-head__inner { align-items: flex-start; } .page-head__stats { gap: var(--sp-5); } }

.entry-content { line-height: 1.75; }
.entry-content h2 { margin-top: var(--sp-6); }
.entry-content ul, .entry-content ol { padding-left: 1.4em; color: var(--text-soft); }

/* ---------- Breadcrumb ---------- */
.breadcrumb { display: flex; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-faint); margin-bottom: var(--sp-3); }
.breadcrumb a { color: var(--text-faint); }
.breadcrumb a:hover { color: var(--water-deep); }

/* ---------- Two-column detail head ---------- */
.detail-head { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-6); align-items: start; padding: var(--sp-7) 0; background: var(--paper-2); border-bottom: 1px solid var(--line); }
.detail-head__media { border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.detail-head__media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.detail-head--installation .detail-head__media { aspect-ratio: 4/5; }
.detail-head--material .detail-head__media { aspect-ratio: 4/5; }
.detail-head__body { display: flex; flex-direction: column; }
.detail-head__lede { font-size: var(--fs-2); color: var(--text-soft); margin-bottom: var(--sp-4); }
.detail-head__actions { display: flex; gap: var(--sp-3); margin-top: var(--sp-5); flex-wrap: wrap; }
@media (max-width: 860px) { .detail-head { grid-template-columns: 1fr; gap: var(--sp-5); padding: var(--sp-6) 0; } }

/* ---------- Material cross-link card ---------- */
.material-link {
	display: flex; align-items: center; gap: var(--sp-4); padding: var(--sp-4); text-decoration: none; color: inherit;
}
.material-link__media { width: 88px; height: 88px; flex: 0 0 auto; border-radius: var(--radius-sm); overflow: hidden; background: var(--surface); }
.material-link__media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.material-link__eyebrow { font-family: var(--font-mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--water-deep); margin-bottom: 4px; }
.material-link__title { font-family: var(--font-display); font-size: var(--fs-3); margin: 0; }

/* ---------- Spec sheet / fact line ---------- */
.spec-sheet { display: grid; gap: 0; border-top: 1px solid var(--line); }
.spec-sheet__row { display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid var(--line); gap: var(--sp-4); }
.spec-sheet__row dt { font-family: var(--font-mono); font-size: 0.8125rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.04em; }
.spec-sheet__row dd { margin: 0; font-weight: 600; text-align: right; }
.fact-line { display: flex; gap: var(--sp-3); flex-wrap: wrap; font-family: var(--font-mono); font-size: 0.8125rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: var(--sp-2); }
dl.fact-line { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px var(--sp-4); }
dl.fact-line .fact-line__row dt { margin-bottom: 2px; }
dl.fact-line .fact-line__row dd { margin: 0; color: var(--text-soft); font-weight: 600; white-space: normal; }

/* ---------- Archive intro + pills ---------- */
.archive-intro { max-width: 640px; margin: var(--sp-3) 0 0; color: var(--text-soft); }
.filter-pills { display: flex; flex-wrap: wrap; gap: 10px; margin: var(--sp-5) 0 var(--sp-6); }
.filter-pills a { display: inline-block; padding: 8px 16px; border-radius: 999px; border: 1px solid var(--line); font-family: var(--font-mono); font-size: 0.8125rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-soft); text-decoration: none; transition: border-color 160ms ease, color 160ms ease; }
.filter-pills a:hover, .filter-pills a.is-active { border-color: var(--water); color: var(--water-deep); }

/* ---------- About page ---------- */
.about-stats { display: flex; gap: var(--sp-6); flex-wrap: wrap; margin: var(--sp-6) 0; padding: var(--sp-5) 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.about-stats__num { font-family: var(--font-mono); font-weight: 700; font-size: var(--fs-4); color: var(--water-deep); }
.about-stats__label { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.08em; }

/* ---------- Comments (WP core classes, minimal skin) ---------- */
.comment-list { list-style: none; margin: 0; padding: 0; }
.comment-list .children { list-style: none; padding-left: var(--sp-5); }
.comment-body { padding: var(--sp-4) 0; border-bottom: 1px solid var(--line); }
.comment-form input, .comment-form textarea {
	width: 100%; padding: 12px 14px; border-radius: var(--radius-sm); border: 1px solid var(--line);
	background: #fff; font-family: var(--font-sans); font-size: 0.9375rem; margin-bottom: var(--sp-3);
}

/* ---------- Reveal ---------- */
[data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity 700ms ease, transform 700ms ease; }
[data-reveal].is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
	[data-reveal] { opacity: 1; transform: none; transition: none; }
}