main > .container {
    padding: 15px 15px 20px;
    display: flex;
    flex-direction: column;
    min-height: 100%;
}

.not-set {
    color: var(--bs-danger);
    font-style: italic;
}

/* add sorting icons to gridview sort links */
a.asc:after, a.desc:after {
    content: '';
    left: 3px;
    display: inline-block;
    width: 0;
    height: 0;
    border: solid 5px transparent;
    margin: 4px 4px 2px 4px;
    background: transparent;
}

a.asc:after {
    border-bottom: solid 7px var(--bs-body-color);
    border-top-width: 0;
}

a.desc:after {
    border-top: solid 7px var(--bs-body-color);
    border-bottom-width: 0;
}

.grid-view th {
    white-space: nowrap;
}

.hint-block {
    display: block;
    margin-top: 5px;
    color: var(--bs-secondary-color);
}

.error-summary {
    color: var(--bs-danger-text-emphasis);
    background: var(--bs-danger-bg-subtle);
    border-left: 3px solid var(--bs-danger-border-subtle);
    padding: 10px 20px;
    margin: 0 0 15px 0;
}

/* text size of the content (design piece 3), only inside <main>: the header and the main menu keep pieces 1-2.
   Old app, yii1-final old/css/main.css: body { font-family: verdana, tahoma, arial, sans-serif; font-size: 8pt },
   h1 14pt, h2 13pt, h3 10pt (all bold, margin 0 0 10px), input/textarea/select/button/optgroup 8pt in the same
   family, .btn 8pt; the colours stay Bootstrap's. */
main {
    --bs-body-font-family: verdana, tahoma, arial, sans-serif;
    --bs-body-font-size: 8pt;
    font-family: var(--bs-body-font-family);
    font-size: var(--bs-body-font-size);
}

main h1,
main h2,
main h3 {
    margin: 0 0 10px;
    font-family: var(--bs-body-font-family);
    font-weight: bold;
}

main h1 {
    font-size: 14pt;
}

main h2 {
    font-size: 13pt;
}

main h3 {
    font-size: 10pt;
}

/* Bootstrap sets these in rem: the old app's 8pt */
main .form-control,
main .form-select,
main .input-group-text {
    font-family: var(--bs-body-font-family);
    font-size: var(--bs-body-font-size);
}

main .btn {
    --bs-btn-font-family: var(--bs-body-font-family);
    --bs-btn-font-size: var(--bs-body-font-size);
}

/* the multi-field search forms in the old grey box (design piece 6): yii1-final old/css/form.css (loaded after main.css;
   no app.css) div.form { border: 1px solid #dddddd; background: #f9f9f9; color: #333333; padding: 6px; border-radius: 3px }
   (old width: 600px was overridden by the inline style="width: auto" of both search portlets: full width here),
   div.form input[type=text] / textarea / select { border: 1px solid #cacaca; border-radius: 3px; background-color: #ffffff },
   div.form input[type=text] { padding: 6px 4px }. Not taken: the select padding 5px 1px (hides Bootstrap's arrow),
   the focus colour, the label-left layout, the button look. The gap between neighbouring buttons is ours. */
.search-form-box { margin-bottom: 1rem; padding: 6px; border: 1px solid #dddddd; border-radius: 3px; background: #f9f9f9; color: #333333; }
.search-form-box .form-control, .search-form-box .form-select { border-color: #cacaca; border-radius: 3px; background-color: #ffffff; }
.search-form-box .form-control { padding: 6px 4px; }
.search-form-box .btn + .btn { margin-left: 4px; }

/* the old pager: yii1-final old/css/yiithemes/skins/silver/pager/pager.css (the CLinkPager skin of the old
   widgetFactory) ul.yiiPager { font-size: 11px }. The grids' pager links here are Yii's plain LinkPager
   (ul.pagination > li > a, no .page-link), so the size is set on the list itself, not only in the variable. */
main .pagination {
    --bs-pagination-font-size: 11px;
    font-size: var(--bs-pagination-font-size);
}

/* tables and grids (header, cells, links in them): the old grid skin yii1-final old/css/yiithemes/skins/silver/
   gridview/styles.css (.grid-view table.items) and main.css (table.dataGrid) set no font size; the old page has
   an XHTML 1.0 Transitional doctype, so its tables inherited the body's 8pt. Measured on the old list screenshot
   (tests/_output/visual/old/guest, searchNimepanek page 2): the grid text is the same size as the paragraph
   above it, row pitch 23px = 8pt line + 2 x 5px padding + border. Not hooned's 16px.
   Cell padding: the old skin's th { padding: 7px 5px }, td { padding: 5px } (main.css table.dataGrid: 5px). */
main .table {
    font-size: var(--bs-body-font-size);
}

main .table > :not(caption) > * > * {
    padding: 5px;
}

main .table > thead > * > th {
    padding: 7px 5px;
}

/* header and main menu: the old app's colours (yii1-final old/css/main.css: #logo, .navbar, .navbar a, .navbar .active) */
#header {
    padding-left: 15px;
    padding-right: 15px;
}

/* the old header strip: yii1-final old/css/main.css #header { height: 71px; background: url(img/ra.gif)
   no-repeat center top }, the title on it as #logo { padding: 20px 0 }; web/css/img/ra.gif is old/css/img/ra.gif */
.site-logo {
    height: 71px;
    padding: 20px 0;
    background: url(img/ra.gif) no-repeat center top;
}

/* title: #logo { font-size: 16pt; font-weight: bold; color: #52565B } */
.site-title {
    display: block;
    max-width: 100%;
    font-size: 16pt;
    font-weight: bold;
    color: #52565B;
    text-decoration: none;
}

.site-title:hover {
    color: #52565B;
}

/* menu: .navbar { background-color: #0088cc }, .navbar a { color: white }, .navbar a:hover / .active { background-color: #00a6fc } */
.main-menu {
    --bs-navbar-padding-x: .25rem;
    --bs-navbar-padding-y: .25rem;
    --bs-navbar-color: #fff;
    --bs-navbar-hover-color: #fff;
    --bs-navbar-active-color: #fff;
    --bs-navbar-nav-link-padding-x: .75rem;
    background-color: #0088cc;
}

.main-menu .nav-link {
    border-radius: var(--bs-border-radius);
}

.main-menu .nav-link:hover,
.main-menu .nav-link:focus,
.main-menu .nav-link.active {
    background-color: #00a6fc;
}

/* align navbar brand baseline with nav links */
.navbar > .container,
.navbar > .container-fluid {
    align-items: baseline;
}

/* align the logout "link" (button in form) of the navbar */
.nav li > form > button.logout {
    color: var(--bs-navbar-color);
}

@media (max-width: 767.98px) {
    .navbar-nav .nav-link.logout {
        display: block;
        text-align: left;
        width: 100%;
        padding: 10px 0;
    }
}

.navbar-nav .nav-link.logout:focus,
.navbar-nav .nav-link.logout:hover {
    color: var(--bs-navbar-hover-color);
}

/* login inputs: seamless icon inside input (Volt style) */
.login-split-card .input-group {
    border: var(--bs-border-width) solid var(--bs-border-color);
    border-radius: var(--bs-border-radius);
    overflow: hidden;
    transition: border-color .15s ease-in-out, box-shadow .15s ease-in-out;
}

.login-split-card .input-group .input-group-text {
    background: transparent;
    border: 0;
    padding-left: 1rem;
    padding-right: .75rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-split-card .input-group .form-control {
    border: 0;
    background: transparent;
}

.login-split-card .input-group .form-control:focus {
    box-shadow: none;
}

.login-split-card .input-group:focus-within {
    border-color: var(--bs-primary);
    box-shadow: 0 0 0 .25rem rgba(var(--bs-primary-rgb), .25);
}

/* validation styles for login split card (browsers with :has()) */
@supports selector(.input-group:has(.is-invalid)) {
    .login-split-card .input-group:has(.is-invalid) ~ .invalid-feedback {
        display: block;
        margin-top: .35rem;
        margin-bottom: .5rem;
    }

    .login-split-card .input-group:has(.is-invalid) {
        border-color: var(--bs-danger);
    }

    .login-split-card .input-group:has(.is-invalid):focus-within {
        box-shadow: 0 0 0 .25rem rgba(var(--bs-danger-rgb), .25);
    }
}

/* fallback validation styles for login split card (browsers without :has()) */
@supports not selector(.input-group:has(.is-invalid)) {
    .login-split-card .invalid-feedback:not(:empty) {
        display: block;
        margin-top: .35rem;
        margin-bottom: .5rem;
    }

    .login-split-card .input-group .form-control.is-invalid {
        border: var(--bs-border-width) solid var(--bs-danger);
    }

    .login-split-card .input-group .form-control.is-invalid:focus {
        box-shadow: 0 0 0 .25rem rgba(var(--bs-danger-rgb), .25);
    }
}

/* login split card */
.login-split-card {
    border-radius: 1rem;
    box-shadow: 0 4px 24px rgba(0, 0, 0, .10);
    background-color: var(--bs-gray-100);
    width: 100%;
    max-width: 900px;
}

.login-split-card-wide {
    max-width: 960px;
}

.login-brand-title {
    font-size: 1.75rem;
    line-height: 1.3;
}

.login-brand-text {
    font-size: .9rem;
}

.login-brand-panel {
    background: linear-gradient(135deg, #40B3D8 0%, #3a9cbd 40%, #83C933 100%);
    position: relative;
    min-height: 480px;
}

.login-brand-panel::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(241, 138, 42, .25) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(131, 201, 51, .2) 0%, transparent 40%);
    pointer-events: none;
}

.login-btn {
    background: linear-gradient(135deg, #40B3D8, #3a9cbd);
    border: none;
    font-weight: 600;
    letter-spacing: .02em;
    transition: opacity .2s, transform .1s;
}

.login-btn:hover {
    opacity: .9;
    transform: translateY(-1px);
}

.login-btn:active {
    transform: translateY(0);
}

/* centered page layout */
.site-login,
.site-index,
.site-error,
.site-about {
    flex: 1;
}

.site-error .site-error-content,
.site-about .site-about-content {
    width: 100%;
    max-width: 90%;
}

@media (min-width: 576px) {
    .site-error .site-error-content,
    .site-about .site-about-content {
        max-width: 80%;
    }
}

@media (min-width: 768px) {
    .site-error .site-error-content,
    .site-about .site-about-content {
        max-width: 60%;
    }
}

@media (min-width: 992px) {
    .site-error .site-error-content,
    .site-about .site-about-content {
        max-width: 50%;
    }
}

/* hero banner */
.hero-banner {
    background: linear-gradient(135deg, #83C933 0%, #3a9cbd 40%, #40B3D8 100%);
    position: relative;
}

.hero-lead {
    max-width: 520px;
}

.hero-logo {
    height: 120px;
    opacity: .45;
    right: 2.5rem;
    top: 50%;
    transform: translateY(-50%);
}

.hero-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background:
        radial-gradient(circle at 15% 85%, rgba(241, 138, 42, .3) 0%, transparent 45%),
        radial-gradient(circle at 85% 15%, rgba(131, 201, 51, .25) 0%, transparent 40%),
        radial-gradient(ellipse at 50% 50%, rgba(64, 179, 216, .15) 0%, transparent 60%);
    pointer-events: none;
}

/* extension cards */
.extension-card {
    transition: transform .15s ease-in-out, box-shadow .15s ease-in-out;
}

.extension-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, .12) !important;
}

.extension-icon {
    font-size: 1.5rem;
    line-height: 1;
}