/* Gossan — shared stylesheet. Tokens first; components below use tokens only.

   Breakpoints (mobile-first, min-width only; custom properties cannot be used
   in media queries, so these four values are the whole system):
     base        phone        one column, two-row header
     sm  36rem   large phone  one-row header, paired form fields
     md  48rem   tablet       wider gutter, header button, two-column layouts
     lg  64rem   desktop      three-column grids, split section heads
   Content stops growing at --wrap (70rem). */

:root {
  color-scheme: light;
  --bg: #FFFFFF;
  --surface: #FFFFFF;
  --band: #F3F6F4;
  --fg: #2B3033;
  --muted: #5B6468;
  --line: #DDE2DF;
  --accent: #17573F;
  --accent-fg: #FFFFFF;
  --shadow: 0 8px 24px rgb(43 48 51 / 0.12);

  --font: "Geist", "Segoe UI", system-ui, -apple-system, Helvetica, Arial, sans-serif;
  --weight-body: 300;
  --weight-head: 400;
  --weight-strong: 500;
  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.125rem;
  --step-2: 1.375rem;
  --step-3: clamp(1.6rem, 1.2rem + 1.6vw, 2.25rem);
  --step-4: clamp(2.1rem, 1.3rem + 3.6vw, 3.6rem);

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: clamp(3.5rem, 2.5rem + 4vw, 6rem);
  --gutter: 1rem;
  --header-h: 6.6rem;
  --wrap: 70rem;
  --radius: 14px;
  --radius-small: 8px;
}

@media (min-width: 36rem) {
  :root { --header-h: calc(4rem + 1px); }
}
@media (min-width: 48rem) {
  :root { --gutter: 2rem; }
}

/* Base */

/* Geist (SIL OFL 1.1, licence beside the file): one variable file, Latin subset.
   Light for running text, Regular for headings, Medium for emphasis. */
@font-face {
  font-family: "Geist";
  src: url("/assets/fonts/geist-latin-wght-normal.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: var(--header-h); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: var(--weight-body) var(--step-0)/1.6 var(--font);
}

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

h1, h2, h3 { margin: 0; font-weight: var(--weight-head); line-height: 1.15; letter-spacing: -0.02em; text-wrap: balance; }
p, ul, ol, dl { margin: 0; }
b, strong { font-weight: var(--weight-strong); }

a { color: inherit; text-decoration-color: var(--accent); text-underline-offset: 0.2em; }
a:hover { color: var(--accent); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

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

.skip {
  position: absolute; left: var(--gutter); top: -4rem; z-index: 20;
  padding: var(--space-1) var(--space-2);
  background: var(--fg); color: var(--bg); border-radius: var(--radius-small);
}
.skip:focus { top: var(--space-1); }

/* Header */

.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.bar { display: flex; flex-wrap: wrap; align-items: center; column-gap: var(--space-2); padding-block: var(--space-1); }
.brand { flex: none; margin-right: auto; }
.brand img { width: 6.5rem; }
.site-nav {
  order: 1; flex-basis: 100%;
  /* Six links in one row from 320px: gap and type tighten below about 400px */
  display: flex; justify-content: space-between; gap: clamp(0.25rem, 4vw - 0.5rem, var(--space-1));
  margin-top: var(--space-1); border-top: 1px solid var(--line);
  font-size: min(var(--step--1), 4.25vw); font-weight: var(--weight-strong);
}
.site-nav a { text-decoration: none; }
.site-nav > a, .nav-group-toggle { padding-block: var(--space-1); }
.site-nav > a[aria-current], .nav-group-toggle[aria-current] { box-shadow: inset 0 -2px var(--accent); }

/* Dropdown parents (Services, Guides). The panels are in the HTML on every
   page and need no JavaScript; they open on hover or keyboard focus, from
   tablet up and only where there is a pointer that hovers. Elsewhere the
   parent is a plain link to its hub, which lists the same pages. */
.nav-group { display: flex; align-items: center; }
.nav-group-toggle { display: inline-flex; align-items: center; gap: 0.375rem; }
.nav-caret {
  display: none; flex: none; width: 0.5625rem; height: 0.5625rem;
  fill: none; stroke: currentColor; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round;
  transition: transform 0.25s ease;
}
.nav-dropdown { display: none; }
.site-header .header-cta { display: none; }
.site-header .header-cta[aria-current] { box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent); }

/* Language menu: a <details> dropdown, so it works without JavaScript */
.lang-menu { position: relative; flex: none; font-size: var(--step--1); font-weight: var(--weight-strong); }
.lang-menu summary {
  display: inline-flex; align-items: center; gap: 0.4rem;
  min-height: 2.25rem; padding-inline: 0.75rem;
  border: 1px solid var(--line); border-radius: 999px;
  list-style: none; cursor: pointer;
}
.lang-menu summary::-webkit-details-marker { display: none; }
.lang-menu summary::after {
  content: ""; width: 0.4rem; height: 0.4rem;
  border: solid currentColor; border-width: 0 2px 2px 0;
  transform: translateY(-0.12rem) rotate(45deg);
}
.lang-menu[open] summary::after { transform: translateY(0.12rem) rotate(-135deg); }
.lang-menu summary:hover, .lang-menu[open] summary { border-color: var(--accent); color: var(--accent); }
.lang-menu ul {
  position: absolute; right: 0; top: calc(100% + var(--space-1)); z-index: 1;
  min-width: 9rem; padding: var(--space-1); list-style: none;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-small);
  box-shadow: var(--shadow);
}
.lang-menu a { display: block; padding: 0.4rem 0.6rem; border-radius: var(--radius-small); text-decoration: none; }
.lang-menu a[aria-current] { color: var(--accent); }
.lang-menu a[aria-disabled="true"] { color: var(--muted); opacity: 0.7; cursor: not-allowed; }

@media (min-width: 36rem) {
  .bar { flex-wrap: nowrap; min-height: 4rem; padding-block: 0; }
  .site-nav { order: 0; flex-basis: auto; gap: var(--space-2); margin-top: 0; border-top: 0; }
}
@media (min-width: 48rem) {
  .brand img { width: 8rem; }
  /* One contact entry per width: the text link on phones, the button from tablet up */
  .site-nav .nav-contact { display: none; }
  .site-header .header-cta { display: inline-flex; flex: none; white-space: nowrap; }
}
@media (min-width: 64rem) {
  .site-nav { gap: var(--space-3); font-size: var(--step-0); }
}
@media (min-width: 48rem) and (hover: hover) {
  /* Groups span the header's height, so a panel at top: 100% starts at the
     header's bottom edge and the pointer never leaves the group on the way */
  .bar { position: relative; }
  .site-nav { align-self: stretch; align-items: center; }
  .nav-group { position: relative; align-self: stretch; }
  .nav-caret { display: block; }
  .nav-group:hover .nav-caret,
  .nav-group:focus-within .nav-caret { transform: rotate(180deg); }

  .nav-dropdown {
    display: block;
    position: absolute; top: 100%; right: 0; z-index: 2;
    margin: 0; padding: 0.625rem 0;
    min-width: 15.625rem;
    list-style: none;
    background: var(--surface);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    opacity: 0; visibility: hidden; transform: translateY(6px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  }
  .nav-group:hover .nav-dropdown,
  .nav-group:focus-within .nav-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
  .nav-dropdown a {
    display: block; padding: 0.5625rem 1.375rem;
    font-size: var(--step--1); font-weight: var(--weight-head);
    color: var(--muted); white-space: nowrap;
    transition: color 0.2s, background 0.2s;
  }
  .nav-dropdown a:hover,
  .nav-dropdown a:focus-visible { color: var(--fg); background: var(--band); }

  /* Mega-menu (Services): one column per category, sized to its content,
     pinned to the header's right gutter so it grows leftward and stays on screen */
  .nav-group:has(> .nav-mega) { position: static; }
  .nav-dropdown.nav-mega {
    right: var(--gutter);
    display: grid; grid-template-columns: repeat(3, max-content); gap: 0.25rem 1.875rem;
    padding: 1.375rem 1.625rem;
    min-width: 0; width: max-content; max-width: calc(100vw - 2 * var(--gutter));
  }
  .nav-mega-col { min-width: 0; }
  .nav-mega .nav-mega-head {
    display: block; padding: 0.375rem 0 0.5rem; margin-bottom: 0.375rem;
    border-bottom: 1px solid var(--line);
    font-weight: var(--weight-strong); color: var(--fg);
    white-space: nowrap; line-height: 1.25;
  }
  .nav-mega .nav-mega-head:hover,
  .nav-mega .nav-mega-head:focus-visible { color: var(--muted); background: none; }
  .nav-mega-col ul { list-style: none; margin: 0; padding: 0; }
  .nav-mega-col ul a { padding: 0.4375rem 0; white-space: normal; line-height: 1.3; }
  .nav-mega-col ul a:hover,
  .nav-mega-col ul a:focus-visible { color: var(--fg); background: none; }
}

/* Buttons */

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.7rem 1.25rem;
  border: 2px solid var(--accent); border-radius: 999px;
  background: var(--accent); color: var(--accent-fg);
  font: inherit; font-weight: var(--weight-strong); line-height: 1.2; text-decoration: none; cursor: pointer;
}
.btn:hover { filter: brightness(1.08); color: var(--accent-fg); }
.btn-ghost { background: transparent; color: var(--fg); border-color: var(--fg); }
.btn-ghost:hover { color: var(--accent); border-color: var(--accent); filter: none; }
.btn-small { padding: 0.45rem 1rem; font-size: var(--step--1); }

/* Sections */

.section { padding-block: var(--space-5); }
.band { background: var(--band); border-block: 1px solid var(--line); }

/* Homepage panels: each is at least one screen below the sticky header and
   grows when its content is taller. --header-h is the header's real height
   (home.js measures it; the :root values are the no-JS fallback). */
.panel {
  position: relative;
  display: flex; flex-direction: column; justify-content: center;
  min-height: calc(100vh - var(--header-h));
  min-height: calc(100svh - var(--header-h));
  padding-block: var(--space-4) calc(var(--space-4) + var(--space-3));
}
/* Card images follow the viewport height here, so a row of cards fits one screen */
@media (min-width: 48rem) {
  .panel .card-img { aspect-ratio: auto; height: clamp(6rem, 20svh, 16rem); }
}
.panel + .panel.band, .panel.band + .panel { border-top: 0; }
.next {
  position: absolute; left: 50%; bottom: var(--space-1);
  display: grid; place-items: center;
  width: 2.75rem; height: 2.75rem; margin-left: -1.375rem;
  border-radius: 50%; color: var(--muted);
  animation: next-nudge 2.4s ease-in-out infinite;
}
.next:hover { color: var(--accent); }
.next svg { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
@keyframes next-nudge {
  50% { transform: translateY(0.4rem); }
}

/* Decorative backgrounds (tools/build_*.py), fading in from the left so the
   heading stays on clear ground: mosaic behind the intro, blocks behind the
   guides hub, terrain behind the closing call to action. */
.mosaic, .blocks, .terrain { position: relative; isolation: isolate; overflow: hidden; }
:is(.mosaic, .blocks, .terrain)::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  -webkit-mask-image: linear-gradient(100deg, transparent 15%, #000 85%);
  mask-image: linear-gradient(100deg, transparent 15%, #000 85%);
}
.mosaic::before { background: url("/assets/bg/mosaic.svg") center / 75rem auto; }
.blocks::before { background: url("/assets/bg/blocks.svg") center / 70rem auto; }
/* Behind a whole section, running text crosses the green facets: at this
   strength --muted still clears 4.5:1 on the strongest one */
.section:is(.mosaic, .blocks)::before { opacity: 0.4; }
/* One picture, not a tile; 35% keeps its horizon inside a short band */
.terrain::before { background: url("/assets/bg/terrain.svg") center 35% / cover no-repeat; }

.eyebrow {
  margin-bottom: var(--space-2);
  color: var(--accent);
  font-size: var(--step--1); font-weight: var(--weight-strong); letter-spacing: 0.12em; text-transform: uppercase;
}
.lead { color: var(--muted); font-size: var(--step-1); max-width: 62ch; }

.head-row { display: grid; gap: var(--space-2); margin-bottom: var(--space-4); }
.head-row :is(h1, h2) { font-size: var(--step-3); }
@media (min-width: 64rem) {
  .head-row { grid-template-columns: 1fr 1fr; gap: var(--space-4); align-items: end; }
}

/* Hero */

.hero { position: relative; isolation: isolate; overflow: hidden; padding-top: var(--space-5); }
.hero-photo { width: 100%; margin-top: var(--space-4); aspect-ratio: 3 / 2; object-fit: cover; }
.hero.panel { justify-content: flex-start; }
.hero.panel .hero-photo { flex: 1 0 8rem; height: 0; aspect-ratio: auto; }
@media (min-width: 64rem) {
  .hero { padding-bottom: var(--space-5); }
  .hero.panel { justify-content: center; }
  .hero.panel .hero-photo { flex: none; height: 100%; }
  .hero-photo {
    position: absolute; inset: 0 0 0 auto; z-index: -1;
    width: 62%; height: 100%; margin: 0; aspect-ratio: auto;
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 45%);
    mask-image: linear-gradient(90deg, transparent, #000 45%);
  }
}
.hero h1 { font-size: var(--step-4); max-width: 16ch; }
.hero .lead { margin-top: var(--space-3); color: var(--fg); font-size: var(--step-2); line-height: 1.4; max-width: 44ch; }
@media (min-width: 64rem) {
  .hero :is(.eyebrow, .lead) { max-width: 32rem; }
}
.actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); }

.page-head { padding-block: var(--space-4) var(--space-3); }
.page-head h1 { font-size: var(--step-4); max-width: 20ch; }
.page-head .lead { margin-top: var(--space-2); }
.page-photo { width: 100%; margin-bottom: var(--space-4); aspect-ratio: 3 / 2; object-fit: cover; border-radius: var(--radius); }
@media (min-width: 48rem) {
  .page-photo { aspect-ratio: 21 / 9; }
}

/* Grids and cards */

.grid { display: grid; gap: var(--space-3); }
@media (min-width: 48rem) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 64rem) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

.card {
  position: relative;
  display: flex; flex-direction: column; gap: var(--space-2);
  padding: var(--space-3);
  background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius);
}
.card-img {
  width: calc(100% + 2 * var(--space-3)); max-width: none;
  margin: calc(-1 * var(--space-3)) calc(-1 * var(--space-3)) 0;
  aspect-ratio: 3 / 2; object-fit: cover;
  border-radius: calc(var(--radius) - 1px) calc(var(--radius) - 1px) 0 0;
}
.card :is(h2, h3) { font-size: var(--step-2); }
.card :is(h2, h3) a { text-decoration: none; }
.card :is(h2, h3) a::after { content: ""; position: absolute; inset: 0; border-radius: var(--radius); }
.card:has(a:hover) { border-color: var(--accent); }
.card p { color: var(--muted); }
.card ul { margin-top: auto; padding: var(--space-2) 0 0; list-style: none; border-top: 1px solid var(--line); font-size: var(--step--1); }
.card li { padding-block: 0.2rem; }
.card li a { position: relative; z-index: 1; text-decoration: none; }
.card li a:hover { text-decoration: underline; }
.card li::before { content: "◆ "; color: var(--accent); font-size: 0.7em; vertical-align: 0.15em; }
.tag { color: var(--accent); font-size: var(--step--1); font-weight: var(--weight-strong); letter-spacing: 0.08em; text-transform: uppercase; }

.steps { counter-reset: step; }
.step { padding-top: var(--space-2); border-top: 2px solid var(--fg); }
.step :is(h2, h3) { font-size: var(--step-1); margin-bottom: var(--space-1); }
.step :is(h2, h3)::before { counter-increment: step; content: counter(step) ". "; color: var(--accent); }
.step p { color: var(--muted); }
.closing { margin-top: var(--space-4); font-size: var(--step-2); font-weight: var(--weight-strong); letter-spacing: -0.01em; max-width: 40ch; }

/* Breadcrumb */

.breadcrumb { padding-top: var(--space-3); font-size: var(--step--1); color: var(--muted); }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 0.4rem; padding: 0; list-style: none; }
.breadcrumb li + li::before { content: "›"; margin-right: 0.4rem; }

/* Service sections on category pages */

.service { padding-block: var(--space-4); border-top: 1px solid var(--line); }
.service h2 { font-size: var(--step-3); margin-bottom: var(--space-3); }
.service-cols { display: grid; gap: var(--space-3); }
.service h3 { margin-bottom: var(--space-1); color: var(--muted); font-size: var(--step--1); letter-spacing: 0.1em; text-transform: uppercase; }
.example { padding: var(--space-3); background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: var(--radius-small); }
@media (min-width: 48rem) {
  .service-cols { grid-template-columns: 2fr 3fr; gap: var(--space-4); }
}

.more { margin-top: var(--space-2); font-weight: var(--weight-strong); }

.siblings { display: flex; flex-wrap: wrap; gap: var(--space-1) var(--space-3); padding-block: var(--space-3); border-top: 1px solid var(--line); font-weight: var(--weight-strong); }

/* Prose pages: stories, privacy */

.prose { max-width: 44rem; padding-bottom: var(--space-5); }
.prose > * + * { margin-top: var(--space-2); }
.prose h2 { font-size: var(--step-2); margin-top: var(--space-4); }
.prose ul { padding-left: 1.2rem; }
.prose li + li { margin-top: 0.4rem; }
.prose li::marker { color: var(--accent); }
.note { padding: var(--space-2) var(--space-3); border-left: 4px solid var(--accent); background: var(--surface); border-radius: var(--radius-small); color: var(--muted); }

.figure { margin-inline: 0; }
.figure img { width: 100%; border-radius: var(--radius); }
.figure figcaption { margin-top: var(--space-1); color: var(--muted); font-size: var(--step--1); }
.byline { margin-top: var(--space-2); color: var(--muted); font-size: var(--step--1); }

/* Questions and answers */

.faq > h2 { margin-bottom: var(--space-3); }
.faq-item :is(h2, h3) { margin-bottom: var(--space-1); font-size: var(--step-1); }
.faq p { color: var(--muted); }
.faq-item + .faq-item { margin-top: var(--space-3); }
.faq-block { max-width: 44rem; padding-block: var(--space-4); border-top: 1px solid var(--line); }
.faq-block > h2, .faq-columns > h2 { font-size: var(--step-3); }
@media (min-width: 48rem) {
  .faq-columns { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3) var(--space-4); }
  .faq-columns > h2 { grid-column: 1 / -1; margin-bottom: 0; }
  .faq-columns .faq-item + .faq-item { margin-top: 0; }
}
.faq-more { padding-block: var(--space-3) var(--space-5); }

.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: var(--step--1); }
th, td { padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--muted); font-weight: var(--weight-strong); }

/* Contact */

.contact-grid { align-items: start; }
@media (min-width: 48rem) {
  .contact-grid { grid-template-columns: 2fr 3fr; gap: var(--space-4); }
}
.contact-methods { display: grid; gap: var(--space-2); }
.contact-methods ul { display: grid; gap: var(--space-1); padding: 0; list-style: none; font-size: var(--step-1); font-weight: var(--weight-strong); overflow-wrap: anywhere; }
.contact-methods p { color: var(--muted); }

.form { display: grid; gap: var(--space-2); padding: var(--space-3); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.field { display: grid; gap: 0.3rem; }
.field label { font-size: var(--step--1); font-weight: var(--weight-strong); }
.field :is(input, select, textarea) {
  width: 100%; padding: 0.65rem 0.75rem;
  background: var(--bg); color: var(--fg);
  border: 1px solid var(--line); border-radius: var(--radius-small);
  font: inherit;
}
.field textarea { min-height: 8rem; resize: vertical; }
.field-trap { position: absolute; left: -100vw; }
.form .btn { justify-self: start; }
.form-note { color: var(--muted); font-size: var(--step--1); }
@media (min-width: 36rem) {
  .field-pair { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2); }
}

/* Call to action band */

.hub-cta { padding-block: var(--space-5); }
.hub-cta h2 { font-size: var(--step-3); max-width: 24ch; }
.hub-cta p { margin-top: var(--space-2); color: var(--muted); max-width: 52ch; }

/* Footer */

.site-footer { padding-block: var(--space-4); border-top: 1px solid var(--line); color: var(--muted); font-size: var(--step--1); }
.footer-top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-2) var(--space-4); margin-bottom: var(--space-3); }
.footer-top img { width: 6.5rem; }
.footer-nav { display: flex; flex-wrap: wrap; gap: var(--space-1) var(--space-3); color: var(--fg); font-weight: var(--weight-strong); }
.site-footer p + p { margin-top: var(--space-1); }
.disclaimer { max-width: 80ch; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .next { animation: none; }
  .nav-caret, .nav-dropdown, .nav-dropdown a { transition: none; }
}