/* ==========================================================================
   Framework replacements (replaces Bootstrap 5.1 CDN)
   Minimal faithful subset of the Bootstrap API actually used by this site:
   container, grid (row / col-sm-6 / col-md-6 / col-lg-8 / col-lg-4 + g-3/g-4),
   navbar (expand-md, collapse, toggler), fixed-top, flex + spacing + text
   utilities. Class names are kept identical so no HTML changes are needed.
   ========================================================================== */

/* --- Layout container --- */
.container {
  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; } }

/* --- Grid --- */
.row {
  --bs-gutter-x: 1.5rem;
  --bs-gutter-y: 0;
  display: flex;
  flex-wrap: wrap;
  margin-top: calc(-1 * var(--bs-gutter-y));
  margin-right: calc(-0.5 * var(--bs-gutter-x));
  margin-left: calc(-0.5 * var(--bs-gutter-x));
}

.row > * {
  flex-shrink: 0;
  width: 100%;
  max-width: 100%;
  padding-right: calc(var(--bs-gutter-x) * 0.5);
  padding-left: calc(var(--bs-gutter-x) * 0.5);
  margin-top: var(--bs-gutter-y);
}

.g-3 { --bs-gutter-x: 1rem; --bs-gutter-y: 1rem; }
.g-4 { --bs-gutter-x: 1.5rem; --bs-gutter-y: 1.5rem; }

@media (min-width: 576px) { .col-sm-6 { flex: 0 0 auto; width: 50%; } }
@media (min-width: 768px) { .col-md-6 { flex: 0 0 auto; width: 50%; } }
@media (min-width: 992px) {
  .col-lg-8 { flex: 0 0 auto; width: 66.66666667%; }
  .col-lg-4 { flex: 0 0 auto; width: 33.33333333%; }
}

/* --- Navbar --- */
.navbar {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

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

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

.nav-link { display: block; }

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

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

.navbar-toggler {
  padding: 0.25rem 0.75rem;
  font-size: 1.25rem;
  line-height: 1;
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: 0.25rem;
  cursor: pointer;
}

.navbar-toggler-icon {
  display: inline-block;
  width: 1.5em;
  height: 1.5em;
  vertical-align: middle;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 0, 0, 0.55)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 100%;
}

@media (min-width: 768px) {
  .navbar-expand-md { flex-wrap: nowrap; justify-content: flex-start; }
  .navbar-expand-md .navbar-nav { flex-direction: row; }
  .navbar-expand-md .navbar-collapse { display: flex !important; flex-basis: auto; }
  .navbar-expand-md .navbar-toggler { display: none; }
}

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

/* --- Flex utilities --- */
.d-flex { display: flex !important; }
.flex-wrap { flex-wrap: wrap !important; }
.align-items-center { align-items: center !important; }
.justify-content-between { justify-content: space-between !important; }
.justify-content-center { justify-content: center !important; }
.gap-2 { gap: 0.5rem !important; }
.gap-3 { gap: 1rem !important; }
.ms-auto { margin-left: auto !important; }
.h-100 { height: 100% !important; }

/* --- Spacing utilities (scale: 0 / .25 / .5 / 1 / 1.5 / 3rem) --- */
.m-0 { margin: 0 !important; }
.mt-3 { margin-top: 1rem !important; }
.mt-4 { margin-top: 1.5rem !important; }
.mt-5 { margin-top: 3rem !important; }
.mb-0 { margin-bottom: 0 !important; }
.mb-2 { margin-bottom: 0.5rem !important; }
.mb-3 { margin-bottom: 1rem !important; }
.mb-4 { margin-bottom: 1.5rem !important; }
.me-1 { margin-right: 0.25rem !important; }
.me-2 { margin-right: 0.5rem !important; }
.me-3 { margin-right: 1rem !important; }
.my-2 { margin-top: 0.5rem !important; margin-bottom: 0.5rem !important; }
.py-4 { padding-top: 1.5rem !important; padding-bottom: 1.5rem !important; }

@media (min-width: 992px) {
  .mt-lg-0 { margin-top: 0 !important; }
}

/* --- Text + border utilities (themed) --- */
.text-center { text-align: center !important; }
.text-uppercase { text-transform: uppercase !important; }
.text-primary { color: var(--primary) !important; }
.text-muted { color: var(--text-muted) !important; }
.text-warning { color: #ffc107 !important; }
.fw-bold { font-weight: 700 !important; }
.h6 { font-size: 1rem; font-weight: 700; line-height: 1.2; }
.small, small { font-size: 0.875em; }
.border-top { border-top: 1px solid var(--border-color) !important; }