:root {
  --background: #fff;
  --background-secondary: #f4f4f4;
  --foreground: #222;
  --foreground-secondary: #666;
  --border: #ccc;
  --link: #1460aa;
  --link-visited: #6c3fa0;
  --primary: #1460aa;
  --primary-foreground: #fff;
  --error: #c62828;

  --main-max-width: 50rem;
  --sidebar-width: 18rem;
  --gap: 0.4rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #1b1d21;
    --background-secondary: #24272c;
    --foreground: #ddd;
    --foreground-secondary: #999;
    --border: #3d4148;
    --link: #6cb1f5;
    --link-visited: #b99ae8;
    --primary: #3a86d4;
    --primary-foreground: #fff;
    --error: #ef6b6b;
  }
}

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

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--background-secondary);
  color: var(--foreground);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 0.875rem;
  line-height: 1.5;

  display: grid;
  grid-template-rows: auto 1fr auto auto;
  grid-template-columns: 1fr minmax(auto, var(--main-max-width)) 1fr;
  grid-template-areas:
    ". header  ."
    ". main    ."
    ". sidebar ."
    ". footer  .";
  gap: var(--gap);
}

/* sidebar beside main once there's room for both */
@media (min-width: 70rem) {
  body {
    grid-template-rows: auto 1fr auto;
    grid-template-columns: 1fr minmax(auto, var(--main-max-width)) var(--sidebar-width) 1fr;
    grid-template-areas:
      ". header header  ."
      ". main   sidebar ."
      ". footer footer  .";
  }
}

a {
  color: var(--link);
  text-decoration: none;
}

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

a:hover {
  text-decoration: underline;
}

h1,
h2 {
  margin: 0 0 0.6rem;
  line-height: 1.2;
}

h1 {
  font-size: 1.2rem;
}

h2 {
  font-size: 1rem;
}

#site-header {
  grid-area: header;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.4rem;
}

.site-header-logo {
  font-size: 1.2rem;
  font-weight: bold;
}

.site-header-logo,
.site-header-logo:visited {
  color: var(--foreground);
}

.site-header-nav a,
.site-header-nav a:visited {
  color: var(--link);
}

main,
#sidebar {
  background: var(--background);
  border: 1px solid var(--border);
  padding: 0.8rem;
}

main {
  grid-area: main;
  min-width: 0;
}

#sidebar {
  grid-area: sidebar;
}

#sidebar dl {
  margin: 0;
}

#sidebar dt {
  font-weight: bold;
}

#sidebar dd {
  margin: 0 0 0.6rem;
}

#sidebar ul {
  margin: 0;
  padding-left: 1.2rem;
}

#site-footer {
  grid-area: footer;
  padding: 0.4rem;
  color: var(--foreground-secondary);
}

.site-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.form-narrow {
  max-width: 25rem;
}

.form-group {
  margin-bottom: 0.8rem;
}

.form-label {
  display: block;
  margin-bottom: 0.2rem;
}

.form-input {
  display: block;
  width: 100%;
  padding: 0.3rem 0.4rem;
  background: var(--background);
  color: var(--foreground);
  border: 1px solid var(--border);
  border-radius: 0;
  font: inherit;
}

.form-input:focus {
  outline: 2px solid var(--primary);
  outline-offset: -1px;
}

.form-input[aria-invalid="true"] {
  border-color: var(--error);
}

.form-error {
  margin: 0.2rem 0 0;
  color: var(--error);
  font-size: 0.8rem;
}

.btn {
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 0;
  background: var(--background);
  color: var(--foreground);
  font: inherit;
  cursor: pointer;
}

.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-foreground);
}

.btn-primary:hover {
  filter: brightness(1.1);
}

.btn-link {
  padding: 0;
  border: 0;
  background: none;
  color: var(--link);
  font: inherit;
  cursor: pointer;
}

.btn-link:hover {
  text-decoration: underline;
}

.site-header-nav {
  display: flex;
  gap: 0.8rem;
}

.logged-in-user {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
  margin: -0.8rem -0.8rem 0.8rem;
  padding: 0.4rem 0.8rem;
  border-bottom: 1px solid var(--border);
}

.logged-in-user:only-child {
  margin-bottom: -0.8rem;
  border-bottom: 0;
}

.logged-in-user-username {
  font-weight: bold;
}

/* groups Settings with Log out at the right */
.logged-in-user-settings {
  margin-left: auto;
}

.user-info {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.2rem 0.8rem;
  margin: 0;
  font-size: 0.8rem;
}

.user-info dt {
  color: var(--foreground-secondary);
}

.user-info dd {
  margin: 0;
}

.group-description {
  margin: 0 0 0.8rem;
  color: var(--foreground-secondary);
}

.post-listing {
  margin: 0;
  padding: 0;
  list-style: none;
}

.post-listing > li + li {
  margin-top: 0.8rem;
}

.post-listing-title {
  display: inline;
  margin: 0;
  font-size: 1rem;
}

.post-domain,
.post-meta,
.post-permalink {
  color: var(--foreground-secondary);
  font-size: 0.8rem;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin: 0.2rem 0;
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
}

.post-tags li {
  padding: 0 0.3rem;
  border: 1px solid var(--border);
}

.post-link,
.post-text {
  overflow-wrap: anywhere;
}

.post-link {
  margin: 0 0 0.4rem;
}

.post-text {
  margin-top: 0.8rem;
  /* plain text until Markdown rendering exists */
  white-space: pre-wrap;
}

.pagination {
  margin-top: 0.8rem;
}

.sidebar-submit {
  display: block;
}

.form-input-narrow {
  max-width: 25rem;
}

textarea.form-input {
  resize: vertical;
}

.form-optional,
.form-hint {
  color: var(--foreground-secondary);
  font-size: 0.8rem;
}

.form-hint {
  margin: 0.2rem 0 0;
}

.invite-list {
  margin: 0.8rem 0 0;
  padding: 0;
  list-style: none;
}

.invite-list > li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.4rem 0;
  border-top: 1px solid var(--border);
}

.invite-code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 1rem;
  /* one click selects the whole code for copying */
  user-select: all;
}

.invite-expiry {
  color: var(--foreground-secondary);
  font-size: 0.8rem;
}

.admin-tools {
  margin-top: 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--border);
}

.admin-tools > p {
  margin: 0;
  font-size: 0.8rem;
}