/* j2c.org theme: dark, flat surfaces, indigo accent (on top of Bootstrap 5.3) */

:root,
[data-bs-theme="dark"] {
  --j2c-bg: #0f1117;
  --j2c-surface: #171a23;
  --j2c-surface-2: #1e2230;
  --j2c-border: #2a2f3e;
  --j2c-text: #d7dbe5;
  --j2c-muted: #8b92a5;
  --j2c-accent: #7c83ff;
  --j2c-accent-hover: #9ea3ff;
  --j2c-accent-rgb: 124, 131, 255;
  --j2c-radius: .75rem;

  --bs-body-bg: var(--j2c-bg);
  --bs-body-color: var(--j2c-text);
  --bs-secondary-color: var(--j2c-muted);
  --bs-border-color: var(--j2c-border);
  --bs-emphasis-color: #fff;
  --bs-heading-color: #f2f4f8;
  --bs-link-color: var(--j2c-accent);
  --bs-link-color-rgb: var(--j2c-accent-rgb);
  --bs-link-hover-color: var(--j2c-accent-hover);
  --bs-link-hover-color-rgb: 158, 163, 255;
  --bs-primary: var(--j2c-accent);
  --bs-primary-rgb: var(--j2c-accent-rgb);
  --bs-tertiary-bg: var(--j2c-surface);
  --bs-secondary-bg: var(--j2c-surface-2);
  --bs-border-radius: .5rem;
  --bs-border-radius-lg: var(--j2c-radius);
  --bs-body-font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Ubuntu, sans-serif;
  --bs-body-line-height: 1.7;
}

html {
  scroll-padding-top: 5rem;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1 0 auto;
}

main > .container {
  max-width: 960px;
}

a {
  text-decoration: none;
  text-underline-offset: .2em;
}

a:hover {
  text-decoration: underline;
}

::selection {
  background: rgba(var(--j2c-accent-rgb), .35);
}

/* NAVBAR
-------------------------------------------------- */

.navbar {
  background-color: rgba(15, 17, 23, .8);
  border-bottom: 1px solid var(--j2c-border);
  backdrop-filter: saturate(160%) blur(12px);
}

.navbar-brand {
  font-weight: 700;
  letter-spacing: -.02em;
}

.navbar-brand img {
  height: 32px;
  width: auto;
  margin-right: .4rem;
}

.navbar .nav-link {
  color: var(--j2c-muted);
  font-weight: 500;
}

.navbar .nav-link:hover,
.navbar .nav-link:focus,
.navbar .nav-link.show {
  color: #fff;
  text-decoration: none;
}

.dropdown-menu {
  --bs-dropdown-bg: var(--j2c-surface);
  --bs-dropdown-border-color: var(--j2c-border);
  --bs-dropdown-link-color: var(--j2c-text);
  --bs-dropdown-link-hover-bg: rgba(var(--j2c-accent-rgb), .15);
  --bs-dropdown-link-hover-color: #fff;
  --bs-dropdown-link-active-bg: var(--j2c-accent);
  padding: .4rem;
  box-shadow: 0 12px 32px rgba(0, 0, 0, .4);
}

.dropdown-item {
  border-radius: .35rem;
}

.dropdown-item:hover {
  text-decoration: none;
}

/* BREADCRUMB
-------------------------------------------------- */

.breadcrumb {
  --bs-breadcrumb-divider-color: var(--j2c-muted);
  --bs-breadcrumb-item-active-color: var(--j2c-muted);
  font-size: .875rem;
  margin: 1.25rem 0;
}

/* CONTENT
-------------------------------------------------- */

h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.25;
}

main h1 {
  font-size: calc(1.6rem + 1.2vw);
  margin-bottom: 1.5rem;
}

main h2 {
  font-size: 1.5rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--j2c-border);
}

main h2::before {
  content: "";
  display: inline-block;
  width: .3rem;
  height: 1.1em;
  margin-right: .6rem;
  vertical-align: -.15em;
  border-radius: 1rem;
  background: var(--j2c-accent);
}

main h3 {
  font-size: 1.2rem;
  margin-top: 1.75rem;
  color: var(--j2c-accent-hover);
}

main ul li::marker {
  color: var(--j2c-accent);
}

p.images {
  text-align: center;
  margin-top: 1.5rem;
  margin-bottom: .5rem;
}

p.images img,
.fancybox img {
  max-width: 100%;
  height: auto;
  margin: .25rem;
  border-radius: var(--j2c-radius);
  border: 1px solid var(--j2c-border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, .35);
  transition: transform .2s ease, box-shadow .2s ease;
}

.fancybox:hover img {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(var(--j2c-accent-rgb), .25);
}

.legende {
  text-align: center;
  color: var(--j2c-muted);
  font-size: .9rem;
  font-style: italic;
  margin-bottom: 1.5rem;
}

p.warning,
p.info,
p.code {
  padding: 1rem 1.25rem;
  border: 1px solid var(--j2c-border);
  border-left-width: 4px;
  border-radius: .5rem;
  background: var(--j2c-surface);
}

p.warning {
  border-left-color: #f0a35e;
  background: rgba(240, 163, 94, .08);
}

p.info {
  border-left-color: var(--j2c-accent);
  background: rgba(var(--j2c-accent-rgb), .08);
}

p.code,
pre {
  font-family: var(--bs-font-monospace);
  font-size: .9rem;
  color: #c9d1ff;
  white-space: pre-wrap;
}

code {
  color: #f08fc0;
}

.alert,
.card {
  border-radius: var(--j2c-radius);
}

.card {
  --bs-card-bg: var(--j2c-surface);
  --bs-card-border-color: var(--j2c-border);
}

.btn-primary {
  --bs-btn-bg: var(--j2c-accent);
  --bs-btn-border-color: var(--j2c-accent);
  --bs-btn-hover-bg: var(--j2c-accent-hover);
  --bs-btn-hover-border-color: var(--j2c-accent-hover);
  --bs-btn-active-bg: var(--j2c-accent-hover);
  --bs-btn-color: #fff;
  --bs-btn-hover-color: #0f1117;
  font-weight: 600;
}

.btn:hover {
  text-decoration: none;
}

/* HOME
-------------------------------------------------- */

.hero {
  position: relative;
  padding: 4rem 0 3rem;
  text-align: center;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -6rem 0 0;
  z-index: -1;
  background: radial-gradient(ellipse 60% 70% at 50% 0, rgba(var(--j2c-accent-rgb), .22), transparent 70%);
}

.hero h1 {
  font-size: calc(2rem + 2vw);
  font-weight: 800;
  letter-spacing: -.03em;
}

.hero h1 span {
  color: var(--j2c-accent);
}

.hero .lead {
  max-width: 40rem;
  margin: 0 auto 2rem;
  color: var(--j2c-muted);
}

.topic-card {
  overflow: hidden;
  height: 100%;
  transition: transform .2s ease, border-color .2s ease;
}

.topic-card:hover {
  transform: translateY(-4px);
  border-color: rgba(var(--j2c-accent-rgb), .6);
}

.topic-card img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.topic-card .card-title a {
  color: var(--bs-heading-color);
}

.topic-card .card-title a::after {
  content: "";
  position: absolute;
  inset: 0;
}

.topic-card .card-text {
  color: var(--j2c-muted);
}

main .row h2 {
  margin-top: 0;
}

/* FOOTER
-------------------------------------------------- */

.site-footer {
  margin-top: 4rem;
  padding: 2rem 0;
  border-top: 1px solid var(--j2c-border);
  background: var(--j2c-surface);
  color: var(--j2c-muted);
  font-size: .8rem;
  text-align: center;
}

.site-footer p {
  margin-bottom: .4rem;
}

.site-footer .diffusion {
  max-width: 42rem;
  margin: 1rem auto 0;
}

.site-footer .diffusion img {
  opacity: .8;
}

#top-link-block {
  z-index: 1030;
  border-radius: 2rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .4);
}

/* RESPONSIVE
-------------------------------------------------- */

@media (max-width: 767px) {
  .nomobile {
    display: none;
  }
}