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

/* ─── Reboot (Bootstrap base resets) ──────────────────────────────────────── */

body { margin: 0; }
h1, h2, h3, h4, h5, h6 { margin-top: 0; margin-bottom: 0.5rem; }
p { margin-top: 0; margin-bottom: 1rem; }
a { color: #0d6efd; text-decoration: underline; }
ul { margin-top: 0; margin-bottom: 1rem; }

/* ─── Grid system ─────────────────────────────────────────────────────────── */

.container {
  width: 100%;
  padding-right: 0.75rem;
  padding-left: 0.75rem;
  margin-right: auto;
  margin-left: auto;
}

.container-fluid {
  width: 100%;
  padding-right: 0.75rem;
  padding-left: 0.75rem;
  margin-right: auto;
  margin-left: auto;
}

@media (min-width: 576px) { .container { max-width: 540px; } }
@media (min-width: 768px) { .container { max-width: 720px; } }
@media (min-width: 992px) { .container { max-width: 960px; } }
@media (min-width: 1200px) { .container { max-width: 1140px; } }
@media (min-width: 1400px) { .container { max-width: 1320px; } }

.row {
  display: flex;
  flex-wrap: wrap;
  margin-right: -0.75rem;
  margin-left: -0.75rem;
}

.row > * {
  padding-right: 0.75rem;
  padding-left: 0.75rem;
}

.gx-5 {
  --bs-gutter-x: 3rem;
  margin-right: calc(-1 * var(--bs-gutter-x) / 2);
  margin-left: calc(-1 * var(--bs-gutter-x) / 2);
}
.gx-5 > .col-lg-6,
.gx-5 > .col-lg-10,
.gx-5 > .col-lg-12 {
  padding-right: calc(var(--bs-gutter-x) / 2);
  padding-left: calc(var(--bs-gutter-x) / 2);
}

.col-lg-12 { flex: 0 0 100%; max-width: 100%; }
.col-lg-10 { flex: 0 0 83.33333333%; max-width: 83.33333333%; }
.col-lg-6  { flex: 0 0 50%; max-width: 50%; }

@media (max-width: 991.98px) {
  .col-lg-6 { flex: 0 0 100%; max-width: 100%; }
}

/* ─── Nav (footer) ───────────────────────────────────────────────────────── */

.nav {
  display: flex;
  flex-wrap: wrap;
  padding-left: 0;
  margin-bottom: 0;
  list-style: none;
}

/* ─── Navbar ─────────────────────────────────────────────────────────────── */

.fixed-top {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 1030;
}

.shadow-sm {
  box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.navbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  position: relative;
  padding: 0.5rem 1rem;
}

.navbar .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: inline-block;
  padding-top: 0.3125rem;
  padding-bottom: 0.3125rem;
  font-size: 1.25rem;
  line-height: inherit;
  white-space: nowrap;
  text-decoration: none;
  color: rgba(0, 0, 0, 0.9);
}

.navbar-brand:hover { color: rgba(0, 0, 0, 0.9); }

.navbar-nav {
  display: flex;
  flex-direction: column;
  padding-left: 0;
  margin-bottom: 0;
  list-style: none;
}

.nav-item { list-style: none; }

.nav-link {
  display: block;
  padding: 0.5rem 0;
  text-decoration: none;
  color: rgba(0, 0, 0, 0.55);
  line-height: 1.5;
}

.nav-link:hover { color: rgba(0, 0, 0, 0.7); }

.navbar-toggler {
  display: flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  font-size: 0.875rem;
  line-height: 1;
  background: none;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 0.25rem;
  color: rgba(0, 0, 0, 0.55);
  cursor: pointer;
}

.navbar-collapse {
  flex-basis: 100%;
  flex-grow: 1;
  align-items: center;
}

@media (max-width: 991.98px) {
  .navbar-collapse.collapse:not(.show) { display: none; }
}

@media (min-width: 992px) {
  .navbar-expand-lg { flex-wrap: nowrap; display: flex; align-items: center; }
  .navbar-expand-lg .navbar-collapse { display: flex !important; flex-basis: auto; align-items: center; }
  .navbar-expand-lg .navbar-nav { flex-direction: row; align-items: center; }
  .navbar-expand-lg .nav-link { padding-right: 0.5rem; padding-left: 0.5rem; }
  .navbar-expand-lg .navbar-toggler { display: none; }
}

/* ─── Section backgrounds ────────────────────────────────────────────────── */

.section-alt { background-color: #f8f9fa; }

/* ─── Spacing ────────────────────────────────────────────────────────────── */

.px-5 { padding-right: 3rem; padding-left: 3rem; }
.px-4 { padding-right: 1.5rem; padding-left: 1.5rem; }
.py-5 { padding-top: 3rem; padding-bottom: 3rem; }
.py-3 { padding-top: 1rem; padding-bottom: 1rem; }

.my-4 { margin-top: 1.5rem; margin-bottom: 1.5rem; }
.me-4 { margin-right: 1.5rem; }
.me-lg-3 { margin-right: 1rem; }
.ms-2 { margin-left: 0.5rem; }
.ms-auto { margin-left: auto; }
.mt-1 { margin-top: 0.25rem; }
.mb-5 { margin-bottom: 3rem; }
.mb-lg-0 { margin-bottom: 0; }

@media (min-width: 992px) {
  .my-lg-0 { margin-top: 0; margin-bottom: 0; }
  .me-lg-3 { margin-right: 1rem; }
  .mb-lg-0 { margin-bottom: 0; }
}

/* ─── Display ────────────────────────────────────────────────────────────── */

.d-flex { display: flex; }
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }

/* ─── Alignment ──────────────────────────────────────────────────────────── */

.align-items-center { align-items: center; }
.justify-content-center { justify-content: center; }
.text-center { text-align: center; }

@media (min-width: 992px) {
  .text-lg-start { text-align: left; }
}

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

.lead {
  font-size: 1.25rem;
  font-weight: 300;
}

.small { font-size: 0.875em; }

.fw-bold { font-weight: 700; }

.text-muted { color: #6c757d; }

/* ─── Components ─────────────────────────────────────────────────────────── */

.rounded-circle { border-radius: 50%; }

.img-thumbnail {
  padding: 0.25rem;
  background-color: #fff;
  border: 1px solid #dee2e6;
  border-radius: 0.25rem;
  max-width: 100%;
  height: auto;
}

.border-top { border-top: 1px solid #dee2e6; }

/* ─── Icons ──────────────────────────────────────────────────────────────── */

.bi {
  display: inline-block;
  vertical-align: -0.125em;
}

/* ─── Collapse animation ─────────────────────────────────────────────────── */

.collapse:not(.show) { display: none; }
.collapse.show { display: block; }

/* ─── Navbar theme overrides (replacing navbar-light) ────────────────────── */

.navbar-light .navbar-brand {
  color: rgba(0, 0, 0, 0.9);
}

/* Mobile nav ordering */
@media (max-width: 991.98px) {
  .navbar-toggler { order: 1; }
  #theme-toggle   { order: 2; margin-left: auto; }
  .navbar-collapse { order: 3; }
}