/* ============================================================
   grid.css — minimal Bootstrap 4-compatible replacement.
   Covers only what this site actually uses:
   - box-sizing reset
   - Grid: .container / .row / .col-lg-* / .col-md-*
   - Navbar: .navbar / .navbar-brand / .navbar-nav / .nav-item /
     .nav-link / .navbar-light / .navbar-expand-md / .fixed-top
   - Utilities: .d-flex, .justify-content-center, .ml-auto
   - Text: .text-left, .text-right, .text-center
   - .fade / .show (history tab-pane leftovers)
   ============================================================ */

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

/* ── Minimal reset (subset of Bootstrap reboot) ── */
body { margin: 0; }
h1, h2, h3, h4, h5, h6 { margin-top: 0; margin-bottom: 0.5rem; }
p { margin-top: 0; margin-bottom: 1rem; }
ul, ol { margin-top: 0; margin-bottom: 1rem; padding-left: 2rem; }
img { vertical-align: middle; border-style: none; }

/* ── Container ── */
.container {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    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; } }

/* ── Row / columns ── */
.row {
    display: flex;
    flex-wrap: wrap;
    margin-right: -15px;
    margin-left: -15px;
}
.col-lg-8, .col-md-4 {
    position: relative;
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
}
@media (min-width: 768px) {
    .col-md-4  { flex: 0 0 33.33333%;  max-width: 33.33333%; }
}
@media (min-width: 992px) {
    .col-lg-8  { flex: 0 0 66.66667%;  max-width: 66.66667%; }
}

/* ── Utility ── */
.ml-auto { margin-left: auto !important; }

/* ── Fixed positioning ── */
.fixed-top {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 1030;
}

/* ── Navbar ── */
.navbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
}
.navbar > .container {
    display: flex;
    flex-wrap: inherit;
    align-items: center;
    justify-content: space-between;
}
.navbar-brand {
    display: inline-block;
    padding-top: 0.3125rem;
    padding-bottom: 0.3125rem;
    margin-right: 1rem;
    white-space: nowrap;
}
.navbar-brand:hover,
.navbar-brand:focus { text-decoration: none; }

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

.nav-link {
    display: block;
    padding: 0.5rem 1rem;
    text-decoration: none;
}
.nav-link:hover,
.nav-link:focus { text-decoration: none; }

/* navbar-expand-md — row layout from md (768px) up */
@media (min-width: 768px) {
    .navbar-expand-md {
        flex-flow: row nowrap;
        justify-content: flex-start;
    }
    .navbar-expand-md .navbar-nav {
        flex-direction: row;
    }
    .navbar-expand-md .navbar-nav .nav-link {
        padding-right: 0.5rem;
        padding-left: 0.5rem;
    }
}

/* Light navbar link colors (Bootstrap default) */
.navbar-light .navbar-nav .nav-link         { color: rgba(0, 0, 0, 0.5); }
.navbar-light .navbar-nav .nav-link:hover,
.navbar-light .navbar-nav .nav-link:focus   { color: rgba(0, 0, 0, 0.7); }