/* ==========================================================================
   Wilco Kasteleijn - site stylesheet
   Structure: variables, base, header/nav, hero, layout grid, content, utilities
   ========================================================================== */

:root {
  --bg: #3a3a3a;
  --bg-header: #0e0e0e;
  --hero-overlay: #212121;
  --text: #fff;
  --accent: #ff9900;
  --muted: #d3d3d3;
  --header-height: 56px;
  --max-width: 1280px;
  --font-body: Bitter, Georgia, serif;
  --font-heading: Montserrat, Arial, sans-serif;
}

/* ---- Base -------------------------------------------------------------- */

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 11pt/1.6 var(--font-body);
}
body.font-arial  { --font-body: Arial, Helvetica, sans-serif; }
body.font-roboto { --font-body: Roboto, Arial, sans-serif; }

a { color: var(--text); text-decoration: underline; }
a.accent { color: var(--accent); }
img { display: block; max-width: 100%; height: auto; }
code { font-family: "Source Code Pro", "Courier New", monospace; }

/* ---- Header & navigation ---------------------------------------------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  background: var(--bg-header);
  font-family: var(--font-heading);
}
.site-title { color: var(--text); font-size: 15pt; text-decoration: none; white-space: nowrap; }

.site-nav ul { margin: 0; padding: 0; list-style: none; }
.site-nav > ul { display: flex; gap: 4px; }
.site-nav li { position: relative; }
.site-nav a {
  display: block;
  padding: 16px 14px;
  color: var(--text);
  font-size: 11pt;
  text-decoration: none;
}
.site-nav a:hover, .site-nav a:focus-visible, .site-nav a[aria-current] { color: var(--accent); }
.site-nav li li a { padding: 10px 16px; white-space: nowrap; }
.site-nav li ul {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 100%;
  background: var(--bg-header);
}
.site-nav li:hover > ul, .site-nav li:focus-within > ul { display: block; }

.nav-toggle, .nav-burger { display: none; }

@media (max-width: 900px) {
  .nav-burger {
    display: block;
    width: 28px;
    height: 20px;
    cursor: pointer;
    background: linear-gradient(var(--text) 0 0) 0 0 / 100% 2px,
                linear-gradient(var(--text) 0 0) 0 50% / 100% 2px,
                linear-gradient(var(--text) 0 0) 0 100% / 100% 2px;
    background-repeat: no-repeat;
  }
  .nav-toggle {
    display: block;
    position: absolute;
    right: 28px;
    width: 28px;
    height: 20px;
    margin: 0;
    opacity: 0;
    cursor: pointer;
    z-index: 1;
  }
  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-header);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }
  .nav-toggle:checked ~ .site-nav { display: block; }
  .site-nav > ul { display: block; }
  .site-nav li ul { display: block; position: static; padding-left: 16px; }
  .site-title { font-size: 13pt; }
}

/* ---- Hero (page title banner) ----------------------------------------- */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 340px;
  padding: calc(var(--header-height) * 2) 0 var(--header-height);
  background: var(--hero-overlay) center / cover no-repeat;
}
.hero.pos-top    { background-position: top center; }
.hero.pos-bottom { background-position: bottom center; }
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--hero-overlay);
  opacity: .6;
}
.hero .row { position: relative; }

main.no-hero { padding-top: var(--header-height); }

/* ---- Layout: sections and 12 column grid ------------------------------ */

.section { padding: 24px 0; }

.row {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  align-items: start;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 48px;
}
.row > div { padding: 0 22px; min-width: 0; }

.span-1{grid-column-end:span 1}
.span-2{grid-column-end:span 2}
.span-3{grid-column-end:span 3}
.span-4{grid-column-end:span 4}
.span-5{grid-column-end:span 5}
.span-6{grid-column-end:span 6}
.span-7{grid-column-end:span 7}
.span-8{grid-column-end:span 8}
.span-9{grid-column-end:span 9}
.span-10{grid-column-end:span 10}
.span-11{grid-column-end:span 11}
.span-12{grid-column-end:span 12}
.start-2{grid-column-start:2}
.start-3{grid-column-start:3}
.start-4{grid-column-start:4}
.start-5{grid-column-start:5}
.start-6{grid-column-start:6}
.start-7{grid-column-start:7}
.start-8{grid-column-start:8}
.start-9{grid-column-start:9}
.start-10{grid-column-start:10}
.start-11{grid-column-start:11}

@media (max-width: 800px) {
  .row { display: block; padding: 0 16px; }
  .row > div { padding: 0 8px; }
  .row > div + div { margin-top: 24px; }
}

/* ---- Content ----------------------------------------------------------- */

h1, h2, h3 { margin: 0; }

h1 {
  padding: 13px 0;
  font: 700 clamp(2.25rem, 6vw, 4.83rem)/1.06 var(--font-heading);
}
h1.sm { font-size: clamp(1.75rem, 4vw, 3rem); line-height: 1.06; }
h1.xs { font-size: 2rem; line-height: 1.6; }

h2, h3 { font-family: Bitter, Georgia, serif; font-weight: 700; }
h2 { margin: 20px 0 14px; font-size: 28px; line-height: 1.38; }
h3 { margin: 20px 0 14px; font-size: 20px; line-height: 1.25; }
h2:first-child, h3:first-child { margin-top: 0; }
h2.sub { font-size: 17pt; font-weight: 500; line-height: 1.6; margin: 8px 0; }

p { margin: 0 0 1em; }
p.small, figcaption { font-size: 10pt; }
figure { margin: 0 0 1em; }
figcaption { margin-top: .5em; }

ul, ol { margin: 0 0 1em; padding-left: 1.6em; }
ul { list-style: square; }
ol { list-style: decimal; }
li { margin-bottom: .4em; }
li ol, li ul { margin: .4em 0 0; }

.row img { width: 100%; margin-bottom: 1em; }
a > img { margin-bottom: 0; }
img.crop { object-fit: cover; }

.button {
  display: block;
  margin: 0 0 1em;
  padding: 8px 12px;
  background: #fff;
  border-radius: 4px;
  color: #000;
  font-family: Bitter, Georgia, serif;
  text-align: center;
  text-decoration: none;
}
.button:hover, .button:focus-visible { background: var(--accent); }

.social {
  display: block;
  width: 32px;
  height: 32px;
  margin: 8px auto;
  border-radius: 50%;
  background: #5a5a5a;
  color: var(--text);
  font: 700 14px/32px Arial, sans-serif;
  text-align: center;
  text-decoration: none;
}

/* ---- Utilities --------------------------------------------------------- */

.accent  { color: var(--accent); }
.muted   { color: var(--muted); }
.center  { text-align: center; }
.justify { text-align: justify; }
.indent-1 { margin-left: 15pt; }
.indent-2 { margin-left: 30pt; }
.indent-3 { margin-left: 45pt; }

.f-arial      { font-family: Arial, Helvetica, sans-serif; }
.f-roboto     { font-family: Roboto, Arial, sans-serif; }
.f-bitter     { font-family: Bitter, Georgia, serif; }
.f-montserrat { font-family: Montserrat, Arial, sans-serif; }