/* Bootstrap 5 Migration - Visual Compatibility CSS */
/* Add this to your main.css to maintain Bootstrap 4 visual consistency */

/* 1. Restore Bootstrap 4 button border-radius if needed */
.btn {
    --bs-border-radius: 0.25rem; /* Bootstrap 4 default was 0.25rem */
}

/* 2. Restore Bootstrap 4 form-control border-radius if needed */
.form-control {
    --bs-border-radius: 0.25rem; /* Maintain consistency */
}

/* 3. If nav-link padding looks different, restore Bootstrap 4 values */
.nav-link {
    padding: 0.5rem 1rem; /* Bootstrap 4 default */
}

/* 4. If container gutters look different, restore Bootstrap 4 behavior */
.row {
    --bs-gutter-x: 30px; /* Bootstrap 4 used 30px gutters */
}

/* 5. Form control focus states - if you want Bootstrap 4 blue focus */
.form-control:focus {
    border-color: #80bdff;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* 6. Button focus states - if you want Bootstrap 4 focus style */
.btn:focus,
.btn.focus {
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* 7. Restore Bootstrap 4 navbar padding and spacing */
.navbar {
    --bs-navbar-padding-x: 1rem; /* Bootstrap 4 default was 1rem */
    --bs-navbar-padding-y: 0.5rem; /* Bootstrap 4 default was 0.5rem */
    --bs-navbar-brand-padding-y: 0.3125rem; /* Bootstrap 4 default */
    --bs-navbar-brand-margin-end: 1rem; /* Bootstrap 4 default */
}

/* 8. Restore Bootstrap 4 navbar-nav spacing */
.navbar-nav {
    --bs-nav-link-padding-x: 0.5rem; /* Bootstrap 4 default */
    --bs-nav-link-padding-y: 0.5rem; /* Bootstrap 4 default */
}

/* 9. Restore Bootstrap 4 container padding */
.container,
.container-fluid,
.container-sm,
.container-md,
.container-lg,
.container-xl,
.container-xxl {
    --bs-gutter-x: 15px; /* Bootstrap 4 used 15px container padding */
    padding-right: calc(var(--bs-gutter-x) * 0.5);
    padding-left: calc(var(--bs-gutter-x) * 0.5);
}

/* 10. Restore Bootstrap 4 form spacing */
.form-group {
    margin-bottom: 1rem; /* Maintain Bootstrap 4 form-group spacing */
}

/* 11. Restore Bootstrap 4 button padding */
.btn {
    --bs-btn-padding-x: 0.75rem; /* Bootstrap 4 default */
    --bs-btn-padding-y: 0.375rem; /* Bootstrap 4 default */
    --bs-btn-font-size: 1rem; /* Bootstrap 4 default */
    --bs-btn-line-height: 1.5; /* Bootstrap 4 default */
    --bs-btn-border-width: 1px; /* Bootstrap 4 default */
}

/* 12. Restore Bootstrap 4 form control sizing */
.form-control {
    --bs-border-width: 1px; /* Bootstrap 4 default */
    padding: 0.375rem 0.75rem; /* Bootstrap 4 default padding */
    font-size: 1rem; /* Bootstrap 4 default */
    line-height: 1.5; /* Bootstrap 4 default */
}

/* 13. Restore Bootstrap 4 input group styling */
.input-group-text {
    padding: 0.375rem 0.75rem; /* Bootstrap 4 default */
    font-size: 1rem; /* Bootstrap 4 default */
    line-height: 1.5; /* Bootstrap 4 default */
    border: 1px solid #ced4da; /* Bootstrap 4 default border color */
}

/* 14. Additional Bootstrap 4 variable overrides for exact compatibility */
:root {
    --bs-primary: #007bff; /* Bootstrap 4 primary color */
    --bs-secondary: #6c757d; /* Bootstrap 4 secondary color */
    --bs-success: #28a745; /* Bootstrap 4 success color */
    --bs-info: #17a2b8; /* Bootstrap 4 info color */
    --bs-warning: #ffc107; /* Bootstrap 4 warning color */
    --bs-danger: #dc3545; /* Bootstrap 4 danger color */
    --bs-light: #f8f9fa; /* Bootstrap 4 light color */
    --bs-dark: #343a40; /* Bootstrap 4 dark color */
    
    /* Bootstrap 4 spacing scale */
    --bs-spacer: 1rem;
    
    /* Bootstrap 4 border radius */
    --bs-border-radius: 0.25rem;
    --bs-border-radius-sm: 0.2rem;
    --bs-border-radius-lg: 0.3rem;
    
    /* Bootstrap 4 font sizes */
    --bs-font-size-base: 1rem;
    --bs-font-size-sm: 0.875rem;
    --bs-font-size-lg: 1.25rem;
}

/* 15. Bootstrap 4 Container Variables from _containers.scss */
:root {
    /* Container max-widths - Bootstrap 4 values */
    --bs-container-sm: 540px;
    --bs-container-md: 720px;
    --bs-container-lg: 960px;
    --bs-container-xl: 1140px;
    /* Note: Bootstrap 5 added --bs-container-xxl: 1320px, but Bootstrap 4 didn't have this */
}

/* 16. Restore Bootstrap 4 container behavior exactly */
.container {
    width: 100%;
    padding-right: 15px; /* Bootstrap 4 used fixed 15px */
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

/* Bootstrap 4 container responsive breakpoints */
@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;
    }
}

/* 17. Bootstrap 4 container-fluid behavior */
.container-fluid {
    width: 100%;
    padding-right: 15px; /* Bootstrap 4 fixed padding */
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

/* 18. Bootstrap 4 responsive containers (if used) */
.container-sm {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

@media (min-width: 576px) {
    .container-sm {
        max-width: 540px;
    }
}

.container-md {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

@media (min-width: 576px) {
    .container-md {
        max-width: 540px;
    }
}

@media (min-width: 768px) {
    .container-md {
        max-width: 720px;
    }
}

.container-lg {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

@media (min-width: 576px) {
    .container-lg {
        max-width: 540px;
    }
}

@media (min-width: 768px) {
    .container-lg {
        max-width: 720px;
    }
}

@media (min-width: 992px) {
    .container-lg {
        max-width: 960px;
    }
}

.container-xl {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

@media (min-width: 576px) {
    .container-xl {
        max-width: 540px;
    }
}

@media (min-width: 768px) {
    .container-xl {
        max-width: 720px;
    }
}

@media (min-width: 992px) {
    .container-xl {
        max-width: 960px;
    }
}

@media (min-width: 1200px) {
    .container-xl {
        max-width: 1140px;
    }
}

/* 19. Override Bootstrap 5's CSS Grid containers if present */
/* Removed display: block !important to prevent conflict with .d-none */
/* .container,
.container-fluid,
.container-sm,
.container-md,
.container-lg,
.container-xl {
    // No display override needed for Bootstrap 4 compatibility
} */

/* 20. Bootstrap 4 grid system gutters - force exact Bootstrap 4 behavior */
.row {
    display: flex;
    flex-wrap: wrap;
    margin-right: -15px; /* Bootstrap 4 used fixed -15px margins */
    margin-left: -15px;
}

.row > * {
    padding-right: 15px; /* Bootstrap 4 fixed gutter */
    padding-left: 15px;
}

/* 21. Restore Bootstrap 4 dropdown caret spacing */
.dropdown-toggle::after {
    margin-left: 0.255em; /* Bootstrap 4 default */
}

/* 22. Restore Bootstrap 4 card shadow */
.card {
    box-shadow: 0 0.125rem 0.25rem rgba(0,0,0,.075); /* Bootstrap 4 default */
}

/* 23. Patch for Bootstrap 4 input-group-append/prepend structure */
.input-group-append .input-group-text,
.input-group-prepend .input-group-text {
    border-radius: 0 0.25rem 0.25rem 0; /* Bootstrap 4 appended default */
    height: 100%;
    display: flex;
    align-items: center;
}
.input-group-prepend .input-group-text {
    border-radius: 0.25rem 0 0 0.25rem; /* Bootstrap 4 prepended default */
}

/* 24. Restore Bootstrap 4 nav-link color for navbar-dark */
.navbar-dark .nav-link {
    color: #fff;
}
.navbar-dark .nav-link:hover, .navbar-dark .nav-link:focus {
    color: #fff;
}

a {
    text-decoration: none;
}
a:hover, a:focus {
    text-decoration: underline;
}