/* 
  vanilla-core.css 
  A minimal replacement for Bootstrap 4 utilities and grid.
*/

:root {
  --grid-gutter-width: 30px;
}

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

/* 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;
}

.no-gutters {
  margin-right: 0;
  margin-left: 0;
}
.no-gutters > [class*="col-"] {
  padding-right: 0;
  padding-left: 0;
}

[class*="col-"] {
  position: relative;
  width: 100%;
  padding-right: 15px;
  padding-left: 15px;
}

.col-12 { flex: 0 0 100%; max-width: 100%; }

@media (min-width: 576px) {
  .col-sm-6 { flex: 0 0 50%; max-width: 50%; }
}

@media (min-width: 768px) {
  .col-md-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
  .col-md-6 { flex: 0 0 50%; max-width: 50%; }
  .col-md-12 { flex: 0 0 100%; max-width: 100%; }
}

@media (min-width: 992px) {
  .col-lg-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
  .col-lg-6 { flex: 0 0 50%; max-width: 50%; }
  .col-lg-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
  .col-lg-12 { flex: 0 0 100%; max-width: 100%; }
  
  .order-lg-1 { order: 1; }
  .order-lg-2 { order: 2; }
}

.order-1 { order: 1; }
.order-2 { order: 2; }

/* Display & Flexbox */
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-inline-block { display: inline-block !important; }
.d-flex { display: flex !important; }

.flex-column { flex-direction: column !important; }
.flex-row { flex-direction: row !important; }

@media (min-width: 768px) {
  .flex-md-row { flex-direction: row !important; }
}

.justify-content-start { justify-content: flex-start !important; }
.justify-content-center { justify-content: center !important; }
.justify-content-end { justify-content: flex-end !important; }
.justify-content-between { justify-content: space-between !important; }

.align-items-start { align-items: flex-start !important; }
.align-items-center { align-items: center !important; }
.align-items-end { align-items: flex-end !important; }

/* Sizing */
.w-100 { width: 100% !important; }
.h-100 { height: 100% !important; }
.img-fluid { max-width: 100%; height: auto; }

/* Positioning */
.position-relative { position: relative !important; }
.position-absolute { position: absolute !important; }
.position-fixed { position: fixed !important; }

/* Typography & Alignment */
.text-left { text-align: left !important; }
.text-center { text-align: center !important; }
.text-right { text-align: right !important; }

@media (min-width: 992px) {
  .text-lg-left { text-align: left !important; }
  .text-lg-center { text-align: center !important; }
  .text-lg-right { text-align: right !important; }
}

.text-muted { color: #6c757d !important; }
.text-primary { color: #007bff !important; }

.float-left { float: left !important; }
.float-right { float: right !important; }

/* Spacing (Margin & Padding) - subset */
.m-0 { margin: 0 !important; }
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.mt-3 { margin-top: 1rem !important; }
.mb-3 { margin-bottom: 1rem !important; }
.mt-4 { margin-top: 1.5rem !important; }
.mb-4 { margin-bottom: 1.5rem !important; }
.mt-5 { margin-top: 3rem !important; }
.mb-5 { margin-bottom: 3rem !important; }

.p-0 { padding: 0 !important; }
.p-3 { padding: 1rem !important; }
.px-1 { padding-left: 0.25rem !important; padding-right: 0.25rem !important; }
.py-4 { padding-top: 1.5rem !important; padding-bottom: 1.5rem !important; }

.mr-0 { margin-right: 0 !important; }
.ml-0 { margin-left: 0 !important; }

/* Gap utility */
.gap20 { gap: 20px; }

/* Alert utility (mimic bootstrap alert) */
.alert {
  position: relative;
  padding: 0.75rem 1.25rem;
  margin-bottom: 1rem;
  border: 1px solid transparent;
  border-radius: 0.25rem;
}

/* Misc Utilities */
.overflow-auto { overflow: auto !important; }
.bg-dark { background-color: #343a40 !important; }

/* Navbar minimal polyfill */
.navbar {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
}
.navbar-brand {
  display: inline-block;
  padding-top: 0.3125rem;
  padding-bottom: 0.3125rem;
  margin-right: 1rem;
  font-size: 1.25rem;
  line-height: inherit;
  white-space: nowrap;
}
@media (min-width: 992px) {
  .navbar-expand-lg {
    flex-flow: row nowrap;
    justify-content: flex-start;
  }
  .navbar-expand-lg .navbar-collapse {
    display: flex !important;
    flex-basis: auto;
  }
}
.navbar-collapse {
  flex-basis: 100%;
  flex-grow: 1;
  align-items: center;
}
.collapse:not(.show) {
  display: none;
}
@media (min-width: 992px) {
  .collapse:not(.show) {
    display: block;
  }
}