main > .container {
    padding: 70px 15px 20px;
    display: flex;
    flex-direction: column;
    min-height: 100%;
}

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

a {
    color: yellow;
}

/* 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;
}

/* 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);
}

/* footer logo: light logo by default (light bg-body-tertiary), dark logo for dark theme */
.footer-logo-dark { display: none; }

[data-bs-theme="dark"] .footer-logo-light { display: none; }
[data-bs-theme="dark"] .footer-logo-dark  { display: inline-block; }

/* 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);
}

/* dark mode login card */
[data-bs-theme="dark"] .login-split-card {
    background-color: var(--bs-body-bg);
    box-shadow: 0 0 0 1px var(--bs-border-color), 0 4px 24px rgba(0, 0, 0, .4);
}

[data-bs-theme="dark"] .login-mobile-logo {
    filter: invert(1);
}

/* contact form textarea height */
.site-contact textarea.form-control {
    height: 140px;
}

/* captcha: blend with card background */
.site-contact img[src*="captcha"] {
    border-radius: var(--bs-border-radius);
    mix-blend-mode: multiply;
}

/* dark mode: invert captcha for visibility on dark background */
[data-bs-theme="dark"] .site-contact img[src*="captcha"] {
    mix-blend-mode: screen;
    filter: invert(1) hue-rotate(180deg);
}

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

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

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

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

@media (min-width: 992px) {
    .site-error .site-error-content,
    .site-about .site-about-content,
    .site-contact-success .site-contact-success-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;
}

/* dark mode: extension cards */
[data-bs-theme="dark"] .extension-card {
    background-color: var(--bs-body-bg);
    box-shadow: 0 0 0 1px var(--bs-border-color), 0 2px 8px rgba(0, 0, 0, .3);
}

[data-bs-theme="dark"] .extension-card:hover {
    box-shadow: 0 0 0 1px var(--bs-border-color), 0 8px 24px rgba(0, 0, 0, .4) !important;
}

/* ============================================================ */
/* СТИЛИ ДЛЯ FULLSCREEN РЕЖИМА */
/* ============================================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body.fullscreen-mode {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    overflow: hidden;
    height: 100vh;
}

/* Блоки для постраничного скролла */
.page-section {
    height: 100vh;
    width: 100%;
    position: relative;
    overflow-y: auto;
    scroll-snap-align: start;
}

/* Верхнее меню (прозрачное поверх видео) */
.main-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    padding: 0.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    font-weight: 500;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links li {
    position: relative;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-size: 1rem;
    transition: 0.3s;
    padding: 8px 0;
    display: inline-block;
    cursor: pointer;
}

.nav-links a:hover {
    color: #ffd966;
}

.nav-links a.active {
    color: #ffd966;
    font-weight: bold;
}

/* Выпадающее меню */
.dropdown-content {
    display: none;
    position: absolute;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(12px);
    min-width: 180px;
    top: 35px;
    left: 0;
    border-radius: 12px;
    padding: 0.5rem 0;
    z-index: 1100;
}

.dropdown-content a {
    color: #f0f0f0;
    padding: 8px 20px;
    display: block;
    font-size: 0.9rem;
}

.dropdown-content a:hover {
    background: rgba(255, 217, 102, 0.2);
    color: #ffd966;
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* Соцсети справа */
.social-icons {
    display: flex;
    gap: 1rem;
}

.social-icons a {
    color: white;
    font-size: 1.4rem;
    transition: 0.2s;
    text-decoration: none;
}

.social-icons a:hover {
    color: #ffd966;
    transform: translateY(-2px);
}

/* Блок с видео на всю область */
.video-section {
    height: 100vh;
    width: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
}

/* Для видео в секциях */
.video-section video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -2;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.45);
    z-index: -1;
}

.hero-text {
    max-width: 800px;
    padding: 2rem;
    z-index: 2;
    animation: fadeInUp 1s ease;
    margin-top: 80px;
}

.hero-text h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.hero-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.hero-text p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
}

/* Стрелка вниз */
.scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    cursor: pointer;
    z-index: 10;
    animation: bounce 2s infinite;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    transition: background 0.3s;
}

.scroll-down:hover {
    background: rgba(255,255,255,0.4);
}

.scroll-down i {
    font-size: 2rem;
    color: white;
}

/* Блоки контента */
.content-block {
    background: #1a2a32;
    color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    position: relative;
}

.content-block:nth-child(even) {
    background: #0f1a1f;
}

.content-block h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.content-block p {
    max-width: 700px;
    font-size: 1.2rem;
    line-height: 1.5;
}

.content-block a {
    text-decoration: none;
}

.content-block a:hover {
    text-decoration: underline;
}

/* Анимации */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(12px); }
}

/* Скролл-снап для вертикальной привязки */
.scroll-container {
    height: 100vh;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
}

.page-section {
    scroll-snap-align: start;
    scroll-snap-stop: always;
}

/* Адаптивность */
@media (max-width: 900px) {
    .main-menu {
        flex-direction: row;
        gap: 0.8rem;
        padding: 0.8rem;
    }
    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    .hero-text h1 {
        font-size: 1.8rem;
    }
    .hero-text h2 {
        font-size: 1.5rem;
    }
    .hero-text p {
        font-size: 0.8rem;
    }
    .content-block h2 {
        font-size: 1.5rem;
    }
    .content-block p {
        font-size: 0.8rem;
    }
}

/* ============================================================ */
/* АДАПТИВНОЕ МЕНЮ ДЛЯ МОБИЛЬНЫХ УСТРОЙСТВ */
/* ============================================================ */

/* Логотип */
.logo a img {
    height: 80px;
    transition: height 0.3s ease;
}

/* Кнопка бургер-меню */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    padding: 8px 12px;
    transition: color 0.3s;
    border-radius: 8px;
}

.menu-toggle:hover {
    color: #ffd966;
    background: rgba(255, 255, 255, 0.1);
}

.menu-toggle.active {
    color: #ffd966;
}

/* Иконка в бургер-меню */
.menu-toggle i {
    pointer-events: none;
}

/* Скрываем навигацию на мобильных устройствах */
@media (max-width: 900px) {
    .menu-toggle {
        display: block;
        position: relative;
        z-index: 1001;
    }
    
    .logo a img {
        height: 60px;
    }
    
    .main-menu {
        flex-wrap: nowrap;
        padding: 0.5rem 1rem;
    }
    
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(0, 0, 0, 0.95);
        backdrop-filter: blur(12px);
        padding: 1rem 2rem;
        gap: 0.5rem;
        width: 100%;
        border-radius: 0 0 12px 12px;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
        margin: 0;
        max-height: 80vh;
        overflow-y: auto;
        z-index: 999;
    }
    
    .nav-links.open {
        display: flex;
    }
    
    .nav-links li {
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    
    .nav-links li:last-child {
        border-bottom: none;
    }
    
    .nav-links a {
        display: block;
        width: 100%;
        padding: 12px 0;
        font-size: 1.1rem;
        text-align: center;
    }
    
    /* Выпадающие подменю на мобильных */
    .dropdown-content {
        position: static;
        background: rgba(255, 255, 255, 0.05);
        backdrop-filter: none;
        border-radius: 8px;
        margin: 0 0 0 1rem;
        padding: 0.3rem 0;
        min-width: auto;
        width: calc(100% - 1rem);
        box-shadow: none;
    }
    
    .dropdown-content a {
        font-size: 0.95rem;
        padding: 8px 16px;
        text-align: center;
    }
    
    .dropdown:hover .dropdown-content {
        display: none;
    }
    
    .dropdown.open .dropdown-content {
        display: block;
    }
    
    .dropdown .fa-chevron-down {
        transition: transform 0.3s ease;
        display: inline-block;
    }
    
    .dropdown.open .fa-chevron-down {
        transform: rotate(180deg);
    }
    
    .social-icons {
        display: none;
    }
}

/* Для очень маленьких экранов */
@media (max-width: 480px) {
    .logo a img {
        height: 50px;
    }
    
    .main-menu {
        padding: 0.3rem 0.8rem;
    }
    
    .menu-toggle {
        font-size: 1.6rem;
        padding: 4px 8px;
    }
    
    .nav-links a {
        font-size: 1rem;
        padding: 10px 0;
    }
}