/* Snowscape theme */

/* ─── Design tokens ─────────────────────────────────────────── */

:root {
  /* Colors */
  --color-bg:       #fcfeff;
  --color-text:     #060606;
  --color-accent-1: #1d9fe0;
  --color-accent-2: #3d1de0;
  --color-link:     var(--color-accent-1);

  /* Fonts */
  --font-title: 'Albert Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body:  'Barlow', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Layout */
  --sidebar-width: 15rem;
  --main-padding:  2rem;

  /* Motion */
  --transition: 160ms ease;
}


/* ─── Reset ──────────────────────────────────────────────────── */

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

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
}


/* ─── Layout ─────────────────────────────────────────────────── */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  overflow-y: auto;
  padding: 2rem;
}

main {
  margin-left: var(--sidebar-width);
  padding: 2rem;
  min-height: 100vh;
}

main > * {
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
}

main > *:last-child {
  margin-bottom: 30vh; /* some space at the end of the content */
}

.copyright {
  position: fixed;
  bottom: 0;
  left: 0;
  width: var(--sidebar-width);
  padding: 2rem;
}

.copyright p {
  margin: 0;
  font-size: 0.77rem;
}


/* ─── Navigation ─────────────────────────────────────────────── */

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

nav ul li a {
  display: block;
  padding: 0.2rem 0;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
}

nav ul li a:hover {
  color: var(--color-accent-1);
}

nav ul li a.active {
  text-decoration: underline;
}


/* ─── Content lists ──────────────────────────────────────────── */

main ul:not(.page-list),
main ol {
  list-style: none;
  padding-inline-start: 0.6rem;
  margin: 0;
}

main ul:not(.page-list) li,
main ol li {
  position: relative;
  padding-inline-start: 1.3rem;
}

main ul:not(.page-list) li::before {
  content: '\2013';
  position: absolute;
  left: 0;
}

main ol {
  counter-reset: list-counter;
}

main ol li {
  counter-increment: list-counter;
}

main ol li::before {
  content: counter(list-counter) '.';
  position: absolute;
  left: 0;
}


/* ─── Page list ──────────────────────────────────────────────── */

.page-list {
  list-style: none;
  margin: 2rem 0;
  padding: 0;
}

.page-list li {
  display: flex;
  flex-direction: column;
  margin-bottom: 1rem;
}

.page-list li::before {
  content: none;
}

.page-list li a:link,
.page-list li a:visited {
  display: block;
  position: relative;
  padding-inline-start: 1.3rem;
  font-size: 1.1rem;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition);
}

.page-list li a::before {
  content: '✦';
  position: absolute;
  left: 0;
  font-size: 1rem;
}

.page-list li a:hover {
  color: var(--color-accent-1);
}

.page-list li time {
  font-size: 0.8rem;
  padding-inline-start: 1.3rem;
}


/* ─── Site title ─────────────────────────────────────────────── */

.site-title,
.breadcrumb-header {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
}

.site-title {
  display: block;
  text-decoration: none;
  transition: color var(--transition);
  margin-bottom: 2rem;
}

.site-title:hover {
  color: var(--color-accent-1);
}


/* ─── Media ──────────────────────────────────────────────────── */

main img {
  max-width: 100%;
  height: auto;
}


/* ─── Figures ────────────────────────────────────────────────── */

figure.wide {
  --_main-width: calc(100vw - var(--sidebar-width) - var(--main-padding) * 2);
  width: var(--_main-width);
  margin-left: calc((100% - var(--_main-width)) / 2);
  text-align: center;
}

figure.wide img {
  max-width: 100%;
  width: auto;
  height: auto;
}


/* ─── Divider ────────────────────────────────────────────────── */

main hr {
  border: none;
  color: var(--color-text);
  text-align: center;
  margin: 2rem 0;
}

main hr::after {
  content: '✦';
}


/* ─── Links ──────────────────────────────────────────────────── */

main a:link,
main a:visited {
  color: var(--color-link);
}


/* ─── Typography ─────────────────────────────────────────────── */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-title);
}

main {
  line-height: 1.3rem;
}

main h1 {
  margin-top: 0;
  margin-bottom: 4rem;
  font-weight: 900;
  font-size: 4rem;
  line-height: 3.6rem;
}

main h2, main h3 {
  margin-top: 3rem;
  margin-bottom: 1rem;
}


/* ─── Responsive ─────────────────────────────────────────────── */

@media (max-width: 768px) {
  .sidebar {
    position: static;
    width: 100%;
    height: auto;
  }

  main {
    margin-left: 0;
  }

  .copyright {
    position: static;
    width: 100%;
  }

  figure.wide {
    --_main-width: calc(100vw - var(--main-padding) * 2);
    width: var(--_main-width);
    margin-left: calc((100% - var(--_main-width)) / 2);
  }
}