/* ==========================================================================
   Zio Marble
   Structure modelled on technoprofil.ca: fixed transparent header with an
   overlay menu, full-bleed hero, mission block with hover-follow thumbnails,
   oversized statement over a photo, a four-column catalogue grid on near-black,
   and a project/market grid.
   Measurements are theirs: h1 100/90, statement 120/114, cards 365×438 r20,
   feature image radius 70px 0 0 0, container padding 100px 30px 135px.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Tokens
   -------------------------------------------------------------------------- */

:root {
	--ink:      #141414;
	--black:    #000000;
	--btn:      #2c2c2c;
	--grey-1:   #f4f4f4;
	--grey-2:   #ededed;
	--rule:     #676767;
	--white:    #ffffff;

	--text:       var(--ink);
	--text-muted: #6b6b6b;
	--surface:    var(--white);

	--font: "Switzer", "Aeonik", "Inter", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
	--font-cjk: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

	/* Their type scale, made fluid. */
	--t-hero:      clamp(2.75rem, 1.1rem + 7vw, 6.25rem);   /* → 100px */
	--t-statement: clamp(2.5rem,  0.6rem + 8vw, 7.5rem);    /* → 120px */
	--t-h2:        clamp(1.75rem, 1.1rem + 2.6vw, 2.75rem); /* → 44px */
	--t-h3:        clamp(1.25rem, 1.05rem + 0.9vw, 1.6rem);
	--t-card:      1.375rem;                                 /* 22px */
	--t-body:      1.125rem;                                 /* 18px */
	--t-small:     0.875rem;                                 /* 14px */

	--gutter:  clamp(1.25rem, 0.6rem + 2vw, 1.875rem);       /* → 30px */
	--pad-top: clamp(3.5rem, 2rem + 5vw, 6.25rem);           /* → 100px */
	--pad-bot: clamp(4rem, 2rem + 7vw, 8.4375rem);           /* → 135px */
	--wrap:    95rem;

	--r-card:   20px;
	--r-thumb:  10px;
	--r-btn:    7px;
	--r-feature: 70px;

	--ease: cubic-bezier(0.22, 1, 0.36, 1);
	--dur:  0.5s;
}

/* --------------------------------------------------------------------------
   2. Reset
   -------------------------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5rem; }

body {
	font-family: var(--font);
	font-size: var(--t-body);
	line-height: 1.35;
	font-weight: 400;
	color: var(--text);
	background: var(--surface);
	-webkit-font-smoothing: antialiased;
}
body.is-locked { overflow: hidden; }

:lang(zh) { font-family: var(--font-cjk); }

img, picture, video, canvas, svg, iframe { display: block; max-width: 100%; }
img, video { height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
ul[class], ol[class] { list-style: none; padding: 0; }

h1, h2, h3, h4 { font-weight: 400; letter-spacing: normal; line-height: 1.1; }

@media (prefers-reduced-motion: reduce) {
	html { scroll-behavior: auto; }
	*, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip { position: absolute; left: -9999px; z-index: 999; padding: 1rem 1.5rem; background: var(--ink); color: var(--white); }
.skip:focus { left: 1rem; top: 1rem; }
:focus-visible { outline: 2px solid currentColor; outline-offset: 3px; }

/* --------------------------------------------------------------------------
   3. Shell
   -------------------------------------------------------------------------- */

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }

.band { padding-block: var(--pad-top) var(--pad-bot); }
.band--dark  { background: var(--ink);  color: var(--white); }
.band--black { background: var(--black); color: var(--white); }
.band--grey  { background: var(--grey-1); }

/* The hairline + small label that opens each major band. */
.band-label {
	position: relative;
	padding-top: 1.25rem;
	margin-bottom: clamp(2rem, 1rem + 3vw, 3.75rem);
	font-size: var(--t-small);
	font-weight: 400;
}
.band-label::before {
	content: "";
	position: absolute;
	top: 0;
	left: calc(var(--gutter) * -1);
	right: calc(var(--gutter) * -1);
	height: 1px;
	background: var(--rule);
}

/* --------------------------------------------------------------------------
   4. Buttons
   -------------------------------------------------------------------------- */

.btn {
	display: inline-flex;
	align-items: center;
	gap: 1.25rem;
	padding: 17px 20px;
	border: 0;
	border-radius: var(--r-btn);
	background: var(--btn);
	color: var(--white);
	font-size: 0.9375rem;
	font-weight: 500;
	line-height: 1;
	cursor: pointer;
	transition: background-color var(--dur) var(--ease);
}
.btn:hover { background: var(--black); }
.btn .arrow { transition: transform var(--dur) var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

.btn--light { background: var(--white); color: var(--ink); }
.btn--light:hover { background: var(--grey-2); }

.arrow { width: 19px; height: 15px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.4; }

/* --------------------------------------------------------------------------
   5. Masthead — logo, language, Menu trigger. No inline nav.
   -------------------------------------------------------------------------- */

.masthead {
	position: fixed;
	inset: 0 0 auto;
	z-index: 60;
	height: 69px;
	display: flex;
	align-items: center;
	color: var(--white);
	transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.masthead[data-solid] { background: var(--white); color: var(--ink); box-shadow: 0 1px 0 rgb(20 20 20 / 0.1); }

.masthead__inner {
	width: 100%; max-width: var(--wrap);
	margin-inline: auto;
	padding-inline: var(--gutter);
	display: flex;
	align-items: center;
	gap: 1.5rem;
}

.brand { font-size: 1.375rem; font-weight: 500; letter-spacing: 0.02em; text-transform: uppercase; }
.masthead__right { margin-left: auto; display: flex; align-items: center; gap: clamp(1rem, 3vw, 3.5rem); }

.menu-toggle {
	display: flex; align-items: center; gap: 0.9rem;
	background: none; border: 0; cursor: pointer;
	font-size: 0.9375rem; font-weight: 500;
}
.menu-toggle__bars { display: grid; gap: 5px; width: 34px; }
.menu-toggle__bars span { display: block; height: 1.5px; background: currentColor; transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease); }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars span:first-child { transform: translateY(6.5px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars span:last-child  { transform: translateY(-6.5px) rotate(-45deg); }

/* Full-screen overlay menu. */
.overlay {
	position: fixed; inset: 0; z-index: 55;
	background: var(--ink); color: var(--white);
	padding: 6rem var(--gutter) 3rem;
	display: grid; align-content: center;
	opacity: 0; visibility: hidden;
	transition: opacity var(--dur) var(--ease), visibility var(--dur);
	overflow-y: auto;
}
.overlay[data-open] { opacity: 1; visibility: visible; }
.overlay__inner { width: 100%; max-width: var(--wrap); margin-inline: auto; display: grid; gap: 3rem; }
@media (min-width: 60rem) { .overlay__inner { grid-template-columns: 2fr 1fr; gap: 5rem; } }

.overlay__list { display: grid; gap: 0.35rem; }
.overlay__list > li > a {
	display: inline-block;
	font-size: clamp(2rem, 1rem + 4vw, 3.75rem);
	line-height: 1.15;
	opacity: 0.92;
	transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.overlay__list > li > a:hover { opacity: 1; transform: translateX(10px); }

.overlay__meta { display: grid; gap: 1.5rem; align-content: start; font-size: var(--t-small); color: rgb(255 255 255 / 0.66); }
.overlay__meta a:hover { color: var(--white); }
.overlay__langs { display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem; }
.overlay__langs a[aria-current] { color: var(--white); }

/* --------------------------------------------------------------------------
   6. Hero — full-bleed media, oversized title bottom-left
   -------------------------------------------------------------------------- */

.hero {
	position: relative;
	min-height: min(100svh, 904px);
	display: grid;
	align-items: end;
	background: var(--black);
	color: var(--white);
	overflow: hidden;
}
.hero__media { position: absolute; inset: 0; }
.hero__media img, .hero__media video { width: 100%; height: 100%; object-fit: cover; }
.hero__media::after {
	content: "";
	position: absolute; inset: 0;
	background: linear-gradient(180deg, rgb(0 0 0 / 0.45) 0%, rgb(0 0 0 / 0.1) 45%, rgb(0 0 0 / 0.75) 100%);
}
.hero__inner {
	position: relative;
	width: 100%; max-width: var(--wrap);
	margin-inline: auto;
	padding: 0 var(--gutter) clamp(2.5rem, 1rem + 5vw, 5rem);
	display: grid;
	gap: 2rem;
}
.hero__title { font-size: var(--t-hero); line-height: 0.9; }
.hero__foot { display: grid; gap: 1.5rem; }
@media (min-width: 56rem) {
	.hero__foot { grid-template-columns: minmax(0, 34rem) auto; align-items: end; justify-content: space-between; }
}
.hero__lede { font-size: var(--t-body); color: rgb(255 255 255 / 0.8); }

/* --------------------------------------------------------------------------
   7. Mission — statement + button left, service list with cursor thumbnails right
   -------------------------------------------------------------------------- */

.mission__grid { display: grid; gap: clamp(2.5rem, 1rem + 5vw, 5rem); }
@media (min-width: 64rem) { .mission__grid { grid-template-columns: minmax(0, 1fr) minmax(0, 609px); align-items: start; } }

.mission__title { font-size: var(--t-h2); line-height: 1.2; max-width: 22ch; margin-bottom: 2rem; }

.mission__list { border-top: 1px solid rgb(20 20 20 / 0.14); }
.mission__item {
	position: relative;
	display: flex; align-items: center; justify-content: space-between; gap: 1.5rem;
	padding: 15px 0;
	min-height: 57px;
	border-bottom: 1px solid rgb(20 20 20 / 0.14);
	transition: padding-left var(--dur) var(--ease);
}
.mission__item:hover { padding-left: 12px; }
.mission__service { font-size: 1rem; font-weight: 500; line-height: 1.25; }

/* The thumbnail follows the cursor and only appears on hover — their signature move. */
.mission__thumb {
	position: absolute;
	top: 0; left: 0;
	width: 212px; height: 144px;
	object-fit: cover;
	border-radius: var(--r-thumb);
	pointer-events: none;
	opacity: 0;
	transform: translate(-50%, -50%) scale(0.94);
	transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
	z-index: 2;
}
.mission__item:hover .mission__thumb { opacity: 1; transform: translate(-50%, -50%) scale(1); }
@media (max-width: 63.999rem) { .mission__thumb { display: none; } }

/* --------------------------------------------------------------------------
   8. Statement over a full-bleed photograph
   -------------------------------------------------------------------------- */

.statement {
	position: relative;
	min-height: clamp(28rem, 20rem + 26vw, 782px);
	display: grid; align-items: center;
	color: var(--white);
	background: var(--ink);
	overflow: hidden;
}
.statement__media { position: absolute; inset: 0; }
.statement__media img { width: 100%; height: 100%; object-fit: cover; }
.statement__media::after { content: ""; position: absolute; inset: 0; background: rgb(0 0 0 / 0.42); }
.statement__inner { position: relative; width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.statement__title { font-size: var(--t-statement); line-height: 0.95; max-width: 14ch; }

/* --------------------------------------------------------------------------
   9. Catalogue grid — their four-column products layout
   -------------------------------------------------------------------------- */

.catalogue { background: var(--ink); color: var(--white); }
.catalogue__inner { width: 100%; max-width: var(--wrap); margin-inline: auto; padding: var(--pad-top) var(--gutter) var(--pad-bot); }

.catalogue__grid { display: grid; gap: 1.25rem; }
@media (min-width: 64rem) {
	.catalogue__grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1.25rem; }
	/* Feature photo occupies the left half across two rows; header sits beside it. */
	.catalogue__feature { grid-column: 1 / 3; grid-row: 1 / 3; }
	.catalogue__head    { grid-column: 3 / 5; grid-row: 1; align-self: start; }
}

.catalogue__feature { position: relative; border-radius: var(--r-feature) 0 0 0; overflow: hidden; min-height: 26rem; }
.catalogue__feature img { width: 100%; height: 100%; object-fit: cover; }
.catalogue__caption { font-size: var(--t-small); line-height: 1.35; margin-bottom: 0.75rem; color: rgb(255 255 255 / 0.8); }

.catalogue__head { display: grid; gap: 1.25rem; align-content: start; padding-block: 1rem; }
.catalogue__title { font-size: var(--t-h2); }
.catalogue__text { font-size: var(--t-body); color: rgb(255 255 255 / 0.72); max-width: 34ch; }
.catalogue__head .btn { justify-self: start; }

/* Stone card: photo tile, number top-left, meta under it, name pinned bottom. */
.stone-card {
	position: relative;
	display: block;
	aspect-ratio: 365 / 438;
	border-radius: var(--r-card);
	overflow: hidden;
	background: var(--black);
	color: var(--white);
	isolation: isolate;
}
.stone-card__img {
	position: absolute; inset: 0;
	width: 100%; height: 100%;
	object-fit: cover;
	z-index: 0;
	transition: transform 0.8s var(--ease), opacity var(--dur) var(--ease);
}

/* Marble is pale — without a scrim the white type vanishes into the stone. */
.stone-card::after {
	content: "";
	position: absolute; inset: 0;
	z-index: 1;
	background:
		linear-gradient(180deg, rgb(0 0 0 / 0.62) 0%, rgb(0 0 0 / 0.5) 26%, rgb(0 0 0 / 0.12) 52%, rgb(0 0 0 / 0.8) 100%);
	transition: opacity var(--dur) var(--ease);
}
.stone-card:hover::after { opacity: 0.88; }
.stone-card:hover .stone-card__img { transform: scale(1.05); }

.stone-card__n {
	position: absolute; z-index: 2; top: 30px; left: 30px;
	width: 40px; height: 40px;
	display: grid; place-items: center;
	border: 0.8px solid var(--white);
	border-radius: 50%;
	font-size: var(--t-small);
	font-weight: 300;
}
.stone-card__meta {
	position: absolute; z-index: 2; top: 110px; left: 30px; right: 30px;
	font-size: var(--t-small);
	line-height: 1.4;
	display: grid; gap: 0.15rem;
}
.stone-card__meta strong { font-weight: 500; }
.stone-card__name {
	position: absolute; z-index: 2; left: 30px; right: 30px; bottom: 30px;
	padding-top: 15px;
	border-top: 1px solid rgb(255 255 255 / 0.35);
	font-size: var(--t-card);
	font-weight: 500;
	display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.stone-card:hover .arrow { transform: translateX(4px); }

/* --------------------------------------------------------------------------
   10. Market / reference grid
   -------------------------------------------------------------------------- */

.tiles { display: grid; gap: 1.25rem; }
@media (min-width: 48rem) { .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 72rem) { .tiles { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

.tile {
	position: relative;
	display: grid; align-content: end; gap: 0.5rem;
	min-height: 22rem;
	padding: 1.75rem;
	border-radius: var(--r-card);
	overflow: hidden;
	background: var(--grey-2);
	color: var(--white);
	isolation: isolate;
}
.tile__img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0; transition: transform 0.8s var(--ease); }
.tile::after { content: ""; position: absolute; inset: 0; z-index: 1; background: linear-gradient(180deg, rgb(0 0 0 / 0.05), rgb(0 0 0 / 0.72)); }
.tile__kicker, .tile__name { position: relative; z-index: 2; }
.tile:hover .tile__img { transform: scale(1.05); }
.tile__kicker { font-size: var(--t-small); color: rgb(255 255 255 / 0.75); }
.tile__name { font-size: var(--t-h3); font-weight: 500; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.tile--plain { background: var(--grey-1); color: var(--ink); min-height: 0; }
.tile--plain::after { display: none; }

/* --------------------------------------------------------------------------
   11. Editorial pages
   -------------------------------------------------------------------------- */

.page-hero { padding: calc(69px + var(--pad-top)) 0 var(--pad-top); }
.page-hero__inner { display: grid; gap: 1.5rem; }
@media (min-width: 60rem) { .page-hero__inner { grid-template-columns: minmax(0, 1fr) minmax(0, 30rem); gap: 5rem; align-items: end; } }
.page-hero__title { font-size: clamp(2.25rem, 1rem + 5vw, 4.5rem); line-height: 1; }
.page-hero__lede { font-size: var(--t-body); color: var(--text-muted); }

.crumbs { font-size: var(--t-small); color: var(--text-muted); padding-top: 1.5rem; }
.crumbs ol { display: flex; flex-wrap: wrap; gap: 0.4em; list-style: none; padding: 0; }
.crumbs li + li::before { content: "/"; margin-right: 0.4em; opacity: 0.5; }

.prose { max-width: 46rem; font-size: var(--t-body); line-height: 1.6; }
.prose > * + * { margin-top: 1.5rem; }
.prose h2 { font-size: var(--t-h2); margin-top: 3.5rem; }
.prose h3 { font-size: var(--t-h3); margin-top: 2.5rem; }
.prose ul, .prose ol { padding-left: 1.25em; }
.prose ul, .prose ul[class] { list-style-type: disc; }
.prose ol, .prose ol[class] { list-style-type: decimal; }
.prose li + li { margin-top: 0.5rem; }
.prose a { text-decoration: underline; text-underline-offset: 0.2em; }
.prose img { border-radius: var(--r-card); }

.specs { border-top: 1px solid rgb(20 20 20 / 0.14); }
.specs__row { display: grid; gap: 0.25rem; padding-block: 1rem; border-bottom: 1px solid rgb(20 20 20 / 0.14); }
@media (min-width: 40rem) { .specs__row { grid-template-columns: 15rem 1fr; gap: 1.5rem; } }
.specs dt { font-size: var(--t-small); color: var(--text-muted); }

.faq details, .prose details { border-bottom: 1px solid rgb(20 20 20 / 0.14); padding-block: 1.25rem; }
.prose summary, .faq summary {
	cursor: pointer; list-style: none;
	font-size: var(--t-h3); font-weight: 500;
	display: flex; justify-content: space-between; gap: 1.5rem;
}
summary::-webkit-details-marker { display: none; }
.prose summary::after, .faq summary::after { content: "+"; font-weight: 400; transition: transform var(--dur) var(--ease); }
details[open] > summary::after { transform: rotate(45deg); }
details > *:not(summary) { margin-top: 1rem; max-width: 62ch; }

/* --------------------------------------------------------------------------
   12. Forms
   -------------------------------------------------------------------------- */

.form { display: grid; gap: 1.25rem; max-width: 46rem; }
@media (min-width: 44rem) { .form__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; } }
.field { display: grid; gap: 0.4rem; }
.field label { font-size: var(--t-small); color: var(--text-muted); }
.field input, .field textarea, .field select {
	width: 100%; padding: 0.85em 1em;
	background: var(--white);
	border: 1px solid rgb(20 20 20 / 0.18);
	border-radius: var(--r-btn);
}
.field input:focus, .field textarea:focus, .field select:focus { border-color: var(--ink); outline: none; }
.field textarea { min-height: 10rem; resize: vertical; }
.field--hp { position: absolute; left: -9999px; }
.notice { padding: 1rem 1.25rem; border-radius: var(--r-btn); background: var(--grey-1); border-left: 3px solid var(--ink); font-size: var(--t-small); }
.notice--error { border-color: #a33; }

/* --------------------------------------------------------------------------
   13. Footer
   -------------------------------------------------------------------------- */

.footer { background: var(--black); color: rgb(255 255 255 / 0.7); padding-top: var(--pad-top); font-size: var(--t-small); }
.footer__inner { width: 100%; max-width: var(--wrap); margin-inline: auto; padding: 0 var(--gutter) 3rem; display: grid; gap: 3rem; }
@media (min-width: 56rem) { .footer__inner { grid-template-columns: 1.5fr 1fr 1fr; gap: 4rem; } }
.footer__wordmark { font-size: 1.5rem; font-weight: 500; text-transform: uppercase; color: var(--white); }
.footer__tagline { margin-top: 0.75rem; max-width: 32ch; }
.footer__contact { font-style: normal; display: grid; gap: 0.3rem; }
.footer__contact a:hover, .footer__list a:hover { color: var(--white); }
.footer__list { display: grid; gap: 0.55rem; }
.footer__bar { border-top: 1px solid rgb(255 255 255 / 0.14); }
.footer__bar-inner { width: 100%; max-width: var(--wrap); margin-inline: auto; padding: 1.25rem var(--gutter); display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; }
.footer__legal { display: flex; gap: 1.5rem; list-style: none; padding: 0; }

.stack > * + * { margin-top: 1.5rem; }
[hidden] { display: none !important; }

/* Masthead language link, and the header while the overlay is open. */
.masthead__lang { font-size: 0.9375rem; font-weight: 500; }
.masthead[data-menu-open] { background: transparent; color: var(--white); box-shadow: none; }