:root {
    --primary-color: #038eaf;
    --secondary-color: #FF8C00;
    --background-color: #f4f4f9;
    --text-color: #333;
    --text-light: #fff;
    --font-primary: 'AppleSystem', sans-serif;
    --font-secondary: 'Playfair Display', serif;
    /* Единый отступ под фиксированную шапку (hero, блоки под навбаром) */
    --navbar-offset: 80px;
    /* Дополнительный зазор для contact / features-head относительно высоты шапки */
    --contact-below-nav: 120px;
    --features-head-below-nav: 40px;
}

/* Основные стили */
body {
    font-family: var(--font-primary);
    margin: 0;
    padding: 0;
    color: var(--text-color);
    background-color: var(--background-color);
    display: flex;
    justify-content: center;
    overflow-y: scroll;
    width: 100%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

body.loaded {
    opacity: 1;
}

/* Главный контейнер страницы */
.main-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    box-sizing: border-box;
    padding: 0;
}

@media (min-width: 1600px) {
    .main-container {
        max-width: 1500px;
    }
}

/* Заголовки */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-secondary);
    font-weight: 400;
    color: var(--primary-color);
    font-size: 1.8rem; /* Умеренный размер заголовков */
    margin: 1em 0;
}

/* Общий отступ для всех секций под фиксированной панелью */
.main-content {
    margin-top: var(--navbar-offset);
}


/* Параграфы */
p {
    text-indent: 1.5em; /* Отступ первой строки абзаца */
    margin: 1em 0;
    line-height: 1.6;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Улучшение читаемости на мобильных */
@media (max-width: 767px) {
    p {
        text-indent: 0;
        hyphens: auto;
    }
}

/* Стили для меню */
.menu {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

.menu li a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: bold;
    font-size: 1rem;
    position: relative;
    transition: color 0.3s ease;
}

.menu li a:hover {
    color: var(--secondary-color);
}

.menu li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--secondary-color);
    transition: width 0.3s ease;
}

.menu li a:hover::after {
    width: 100%;
}

/* Навигационная панель */
.navbar {
    background-color: var(--primary-color);
    padding: 10px 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 1000;
}

.navbar-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

@media (min-width: 1920px) {
    .navbar-wrapper {
        max-width: 1400px;
    }
}

@media (min-width: 1600px) {
    .navbar-wrapper {
        max-width: 1500px;
    }
}

@media (min-width: 1440px) and (max-width: 1919px) {
    .navbar-wrapper {
        max-width: 1300px;
    }
}

@media (min-width: 1280px) and (max-width: 1439px) {
    .navbar-wrapper {
        max-width: 1200px;
    }
}

@media (min-width: 1024px) and (max-width: 1279px) {
    .navbar-wrapper {
        max-width: 100%;
        padding: 0 20px;
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    :root {
        --navbar-offset: 70px;
    }

    .navbar-wrapper {
        max-width: 100%;
        padding: 0 20px;
    }
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

/* Логотип */
.logo {
    width: 120px;
    height: 120px;
    transition: transform 0.3s ease;
    object-fit: contain;
    display: block;
}

.logo-link {
    display: inline-block;
    line-height: 0;
}

@keyframes rotateLogo {
    from {
        transform: rotateY(0deg);
    }
    to {
        transform: rotateY(360deg);
    }
}

.logo:hover {
    animation: rotateLogo 2s linear infinite;
}

/* 3D-эффект для заголовка проекта */
.project-title-3d {
    font-size: 2.5rem;
    font-family: var(--font-secondary);
    color: var(--text-light);
    text-shadow: 1px 1px 2px #000, 2px 2px 4px rgba(0, 0, 0, 0.3), 3px 3px 8px rgba(0, 0, 0, 0.2);
    letter-spacing: 1px;
    transform: rotateX(20deg) rotateY(-10deg);
    transition: transform 0.3s ease;
}

.project-title-3d:hover {
    transform: rotateX(0deg) rotateY(0deg) scale(1.05);
    text-shadow: 2px 2px 4px #000, 3px 3px 6px rgba(0, 0, 0, 0.4), 4px 4px 12px rgba(0, 0, 0, 0.3);
}

/* Dropdown для выбора языка */
.navbar .dropdown select {
    background-color: var(--primary-color);
    color: var(--text-light);
    border: none;
    padding: 8px 12px;
    font-weight: bold;
    font-size: 1rem;
    border-radius: 5px;
    margin-left: 10px;
    appearance: none;
    max-width: 150px;
}

/* Плавная анимация для секций */
.animate-section {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.animate-section.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Герой-секция */
.hero {
    background: linear-gradient(135deg, var(--primary-color), #004e64);
    color: var(--text-light);
    padding: 150px 20px;
    text-align: center;
    max-width: 1200px;
    margin: var(--navbar-offset) auto 0;
    width: 100%;
    box-sizing: border-box;
}

@media (min-width: 1600px) {
    .hero {
        max-width: 1500px;
        padding: 180px 40px;
    }
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    animation: fadeIn 1.5s ease;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    animation: fadeIn 2s ease;
}

.hero-content {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.hero-content.visible {
    opacity: 1;
    transform: translateY(0);
}

.hero-features-section {
    background: linear-gradient(135deg, #038eaf, #004e64);
    color: #fff;
    padding: 100px 20px;
    text-align: center;
    margin-top: var(--navbar-offset);
}

.hero-features-section h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    color: #fff;
}

.hero-features-section p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: #fff;
}
.features-head {
    padding-top: calc(var(--navbar-offset) + var(--features-head-below-nav));
    text-align: center;
}

.features-head h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    color: #038eaf; /* Цвет заголовка */
}

.features-head p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    color: #333; /* Цвет текста */
}

/* Основные кнопки */
.btn-main, .contact-form button {
    background-color: var(--text-light);
    color: var(--primary-color);
    padding: 12px 30px;
    border-radius: 5px;
    font-weight: bold;
    text-decoration: none;
    transition: background 0.3s, transform 0.3s;
    cursor: pointer;
}

.btn-main:hover, .contact-form button:hover {
    background-color: #ddd;
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.btn-main:active, .contact-form button:active {
    transform: scale(0.98);
}

/* Общие стили для текстовых секций */
.content-section,
.overview-container,
.features-container,
.privacy-container,
.contact-container,
.feature-step {
    max-width: 100%;
    font-size: 1.1rem;
    line-height: 1.6;
    text-align: left;
    padding: 0 20px;
}

/* Заголовки в текстовых секциях */
.content-section h2, .overview-title, .features-title, .privacy-title {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

/* Карточки функций */
.feature-cards {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}

@media (min-width: 1600px) {
    .feature-cards {
        max-width: 1500px;
        gap: 30px;
    }
}

.feature-card {
    background: var(--text-light);
    padding: 20px;
    border-radius: 8px;
    width: 220px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.feature-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    transition: transform 0.3s ease, color 0.3s ease;
}

.feature-card:hover i {
    transform: scale(1.1) rotate(5deg);
    color: var(--secondary-color);
}

.feature-card h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
}

/* Стили для страницы Features */
.features-list {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

/* Стили для страницы Contact */
.contact-info {
    text-align: left;
}

.contact-form input[type="text"], .contact-form input[type="email"], .contact-form textarea {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 1rem;
    box-sizing: border-box;
}

.contact-container {
    margin-top: 200px; /* Отступ от фиксированной панели */
}


/* Стили для страницы Privacy */
.privacy-section {
    margin-bottom: 30px;
}

.privacy-section h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

/* Footer */
.footer {
    background-color: var(--text-color);
    color: var(--text-light);
    padding: 20px;
    text-align: center;
    font-size: 0.9rem;
    max-width: 1200px;
    margin: 50px auto 0;
    width: 100%;
    box-sizing: border-box;
}

@media (min-width: 1600px) {
    .footer {
        max-width: 1500px;
    }
}

/* Анимация для плавного появления */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Эффекты для изображений в галерее */
.feature-image {
    position: relative;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    perspective: 1000px;
}

.feature-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    transition: transform 0.4s ease, box-shadow 0.4s ease;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

.feature-image img:hover {
    transform: rotateY(5deg) scale(1.05);
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.3);
    filter: brightness(1.05);
}

.feature-step {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.feature-step.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Стили для сообщений об ошибках и успехе */
.alert {
    padding: 15px 20px;
    margin: 20px 0;
    border-radius: 5px;
    font-weight: 500;
    animation: slideIn 0.3s ease-out;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Стили для ошибок валидации формы */
.error-message {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 5px;
    margin-bottom: 10px;
    display: block;
    animation: fadeIn 0.3s ease-in;
}

.input-error {
    border-color: #dc3545 !important;
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25) !important;
}

.contact-form label {
    display: block;
    margin-top: 15px;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--text-color);
}

.contact-form input[type="text"]:focus,
.contact-form input[type="email"]:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(3, 142, 175, 0.25);
    transition: all 0.3s ease;
}

/* Улучшенные анимации */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* ============================================
   АДАПТИВНЫЕ СТИЛИ ДЛЯ РАЗНЫХ ЭКРАНОВ
   ============================================ */

/* Большие экраны (1920px и выше) */
@media (min-width: 1920px) {
    .main-container {
        max-width: 1400px;
    }

    .hero h1 {
        font-size: 3.5rem;
    }

    .hero p {
        font-size: 1.4rem;
    }

    .feature-cards {
        gap: 30px;
    }

    .feature-card {
        width: 280px;
        padding: 30px;
    }

    .content-section,
    .overview-container,
    .features-container,
    .privacy-container,
    .contact-container {
        padding: 0 40px;
        font-size: 1.2rem;
    }
}

/* Большие десктопы (1440px - 1919px) */
@media (min-width: 1440px) and (max-width: 1919px) {
    .main-container {
        max-width: 1300px;
    }

    .hero h1 {
        font-size: 3.2rem;
    }

    .hero p {
        font-size: 1.3rem;
    }

    .feature-card {
        width: 260px;
    }
}

/* Средние десктопы (1280px - 1439px) */
@media (min-width: 1280px) and (max-width: 1439px) {
    .main-container {
        max-width: 1200px;
    }

    .hero h1 {
        font-size: 3rem;
    }
}

/* Планшеты в альбомной ориентации (1024px - 1279px) */
@media (min-width: 1024px) and (max-width: 1279px) {
    .main-container {
        max-width: 100%;
        padding: 0 20px;
    }

    .navbar .container {
        padding: 10px 20px;
    }

    .logo {
        width: 100px;
        height: 100px;
    }

    .project-title-3d {
        font-size: 2.2rem;
    }

    .menu {
        gap: 18px;
    }

    .hero {
        padding: 120px 30px;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .feature-cards {
        gap: 20px;
    }

    .feature-card {
        width: 240px;
    }
}

/* Планшеты (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
    .main-container {
        max-width: 100%;
        padding: 0 20px;
    }

    .navbar .container {
        flex-wrap: wrap;
        padding: 10px 20px;
    }

    .logo {
        width: 90px;
        height: 90px;
    }

    .project-title-3d {
        font-size: 1.8rem;
    }

    .menu {
        gap: 15px;
        flex-wrap: wrap;
    }

    .hero {
        padding: 100px 25px;
        margin-top: var(--navbar-offset);
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero p {
        font-size: 1.05rem;
    }

    .feature-cards {
        gap: 20px;
        justify-content: center;
    }

    .feature-card {
        width: calc(50% - 10px);
        max-width: 300px;
        min-width: 250px;
    }

    .content-section,
    .overview-container,
    .features-container,
    .privacy-container,
    .contact-container {
        padding: 0 20px;
        font-size: 1.05rem;
    }

    .breadcrumbs {
        padding: 12px 18px;
        font-size: 0.9rem;
    }
}

/* Мобильные устройства (481px - 767px) */
@media (max-width: 767px) {
    :root {
        --navbar-offset: 60px;
        --contact-below-nav: 40px;
        --features-head-below-nav: 30px;
    }

    .navbar {
        padding: 8px 0;
    }

    .navbar-wrapper {
        max-width: 100%;
        padding: 0;
    }

    .navbar .container {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: center;
        padding: 8px 15px;
        gap: 8px;
    }

    .logo {
        width: 70px;
        height: 70px;
    }

    .project-title-3d {
        font-size: 1.4rem;
        text-align: center;
        flex: 1;
        min-width: 0;
    }

    .menu {
        flex-direction: row;
        flex-wrap: wrap;
        width: 100%;
        gap: 8px;
        justify-content: center;
        margin-top: 8px;
    }

    .menu li {
        flex: 1 1 auto;
        min-width: fit-content;
    }

    .menu li a {
        display: block;
        padding: 8px 12px;
        font-size: 0.9rem;
        white-space: nowrap;
    }

    .menu li a i {
        display: none; /* Скрываем иконки на мобильных для экономии места */
    }

    .theme-toggle {
        padding: 6px 10px;
        font-size: 1rem;
        margin-left: 5px;
    }

    .navbar .dropdown {
        width: 100%;
        margin-top: 8px;
    }

    .navbar .dropdown select {
        width: 100%;
        max-width: 100%;
        margin: 0;
        padding: 10px;
    }

    .feature-cards {
        flex-direction: column;
        align-items: stretch;
        gap: 15px;
        padding: 0 15px;
        margin: 0;
    }

    .feature-card {
        width: 100%;
        max-width: 100%;
        padding: 20px;
        margin: 0;
        box-sizing: border-box;
    }

    .hero {
        padding: 70px 15px;
    }

    .hero h1 {
        font-size: 1.8rem;
        line-height: 1.3;
    }

    .hero p {
        font-size: 0.95rem;
        line-height: 1.5;
    }

    .hero-features-section {
        padding: 56px 15px;
        margin-top: var(--navbar-offset);
    }

    .hero-features-section h1 {
        font-size: 1.85rem;
        margin-bottom: 14px;
    }

    .hero-features-section p {
        font-size: 0.98rem;
        margin-bottom: 18px;
    }

    .hero-content {
        padding: 70px 15px;
    }

    .overview-title, .features-title, .privacy-title, .contact-title {
        font-size: 1.6rem;
        text-align: center;
        line-height: 1.3;
    }

    .features-head {
        padding-left: 15px;
        padding-right: 15px;
    }

    .features-head h1 {
        font-size: 1.8rem;
    }

    .features-head p {
        font-size: 1rem;
    }

    .btn-main, .contact-form button {
        width: 100%;
        padding: 14px;
        font-size: 1rem;
    }

    .contact-container {
        padding: 0 15px;
    }

    .contact-form input[type="text"],
    .contact-form input[type="email"],
    .contact-form textarea {
        font-size: 1rem;
        padding: 12px;
    }

    .content-section,
    .overview-container,
    .features-container,
    .privacy-container {
        padding: 0 15px;
        font-size: 1rem;
    }

    .content-section h2,
    .overview-title,
    .features-title,
    .privacy-title {
        font-size: 1.6rem;
    }

    .footer {
        font-size: 0.85rem;
        padding: 15px;
    }

    .feature-step {
        margin-bottom: 25px;
        padding: 0 15px;
    }

    .feature-step h2 {
        font-size: 1.4rem;
    }

    .feature-image {
        margin: 15px 0;
    }

    .breadcrumbs {
        padding: 10px 15px;
        font-size: 0.85rem;
        margin: 15px 0;
    }

    .breadcrumbs li:not(:last-child)::after {
        margin: 0 8px;
    }

    p {
        text-indent: 1em;
        font-size: 0.95rem;
    }

    .main-container h1,
    .main-container h2,
    .main-container h3,
    .main-container h4,
    .main-container h5,
    .main-container h6 {
        font-size: 1.5rem;
    }

    .content-section p,
    .overview-container p,
    .features-container p,
    .privacy-container p {
        text-indent: 0;
        padding-left: 0;
    }

    .contact-info ul {
        padding-left: 20px;
    }

    .contact-info li {
        margin-bottom: 10px;
        font-size: 0.9rem;
    }

    .feature-image img {
        border-radius: 6px;
    }
}

/* Маленькие мобильные (376px - 480px) */
@media (max-width: 480px) {
    :root {
        --navbar-offset: 55px;
        --contact-below-nav: 35px;
        --features-head-below-nav: 25px;
    }

    .navbar {
        padding: 6px 0;
    }

    .navbar-wrapper {
        max-width: 100%;
        padding: 0;
    }

    .navbar .container {
        padding: 6px 12px;
    }

    .logo {
        width: 60px;
        height: 60px;
    }

    .project-title-3d {
        font-size: 1.2rem;
        letter-spacing: 0.5px;
    }

    .menu {
        gap: 6px;
    }

    .menu li a {
        padding: 6px 10px;
        font-size: 0.85rem;
    }

    .theme-toggle {
        padding: 5px 8px;
        font-size: 0.9rem;
    }

    .hero {
        padding: 60px 12px;
    }

    .hero h1 {
        font-size: 1.5rem;
        margin-bottom: 15px;
    }

    .hero p {
        font-size: 0.9rem;
        margin-bottom: 20px;
    }

    .hero-features-section {
        padding: 48px 12px;
    }

    .hero-features-section h1 {
        font-size: 1.65rem;
    }

    .hero-features-section p {
        font-size: 0.94rem;
    }

    .hero-content {
        padding: 60px 12px;
    }

    .overview-title, .features-title, .privacy-title, .contact-title {
        font-size: 1.4rem;
        margin-bottom: 15px;
    }

    .features-head {
        padding-left: 12px;
        padding-right: 12px;
    }

    .features-head h1 {
        font-size: 1.6rem;
    }

    .features-head p {
        font-size: 0.95rem;
    }

    .feature-card {
        padding: 15px;
        margin: 0;
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }

    .feature-card i {
        font-size: 2.5rem;
        margin-bottom: 8px;
    }

    .feature-card h3 {
        font-size: 1.1rem;
        margin-bottom: 10px;
    }

    .feature-card p {
        font-size: 0.9rem;
    }

    .content-section,
    .overview-container,
    .features-container,
    .privacy-container,
    .contact-container {
        padding: 0 12px;
        font-size: 0.95rem;
    }

    .content-section h2,
    .overview-title,
    .features-title,
    .privacy-title {
        font-size: 1.4rem;
    }

    p {
        font-size: 0.9rem;
        text-indent: 1em;
        margin: 0.8em 0;
    }

    .btn-main, .contact-form button {
        padding: 12px;
        font-size: 0.95rem;
    }

    .contact-form input[type="text"],
    .contact-form input[type="email"],
    .contact-form textarea {
        font-size: 0.95rem;
        padding: 10px;
    }

    .contact-form label {
        font-size: 0.9rem;
        margin-top: 12px;
    }

    .footer {
        font-size: 0.8rem;
        padding: 12px;
    }

    .feature-step {
        margin-bottom: 20px;
        padding: 0 12px;
    }

    .feature-step h2 {
        font-size: 1.3rem;
    }

    .feature-step p {
        font-size: 0.9rem;
    }

    .feature-image {
        margin: 12px 0;
    }

    .breadcrumbs {
        padding: 8px 12px;
        font-size: 0.8rem;
        margin: 12px 0;
    }

    .breadcrumbs li:not(:last-child)::after {
        margin: 0 6px;
    }

    .alert {
        padding: 12px 15px;
        font-size: 0.9rem;
        margin: 15px 0;
    }

    .error-message {
        font-size: 0.8rem;
    }

    .main-container h1,
    .main-container h2,
    .main-container h3,
    .main-container h4,
    .main-container h5,
    .main-container h6 {
        font-size: 1.4rem;
        margin: 0.8em 0;
    }

    .main-container h2 {
        font-size: 1.3rem;
    }
}

/* Очень маленькие мобильные (до 375px - iPhone SE) */
@media (max-width: 375px) {
    :root {
        --navbar-offset: 50px;
        --contact-below-nav: 30px;
        --features-head-below-nav: 20px;
    }

    .navbar-wrapper {
        max-width: 100%;
        padding: 0;
    }

    .navbar .container {
        padding: 5px 10px;
    }

    .logo {
        width: 50px;
        height: 50px;
    }

    .project-title-3d {
        font-size: 1.1rem;
        letter-spacing: 0.3px;
    }

    .menu li a {
        padding: 5px 8px;
        font-size: 0.8rem;
    }

    .theme-toggle {
        padding: 4px 6px;
        font-size: 0.85rem;
    }

    .hero {
        padding: 50px 10px;
    }

    .hero h1 {
        font-size: 1.3rem;
        margin-bottom: 12px;
    }

    .hero p {
        font-size: 0.85rem;
        margin-bottom: 18px;
    }

    .hero-features-section {
        padding: 40px 10px;
    }

    .hero-features-section h1 {
        font-size: 1.45rem;
    }

    .hero-features-section p {
        font-size: 0.88rem;
    }

    .hero-content {
        padding: 50px 10px;
    }

    .overview-title, .features-title, .privacy-title, .contact-title {
        font-size: 1.3rem;
        margin-bottom: 12px;
    }

    .features-head {
        padding-left: 10px;
        padding-right: 10px;
    }

    .features-head h1 {
        font-size: 1.4rem;
    }

    .features-head p {
        font-size: 0.9rem;
    }

    .feature-card {
        padding: 12px;
        margin: 0;
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }

    .feature-card i {
        font-size: 2rem;
        margin-bottom: 6px;
    }

    .feature-card h3 {
        font-size: 1rem;
        margin-bottom: 8px;
    }

    .feature-card p {
        font-size: 0.85rem;
    }

    .content-section,
    .overview-container,
    .features-container,
    .privacy-container,
    .contact-container {
        padding: 0 10px;
        font-size: 0.9rem;
    }

    .content-section h2,
    .overview-title,
    .features-title,
    .privacy-title {
        font-size: 1.3rem;
    }

    p {
        font-size: 0.85rem;
        text-indent: 0.8em;
        margin: 0.7em 0;
        line-height: 1.5;
    }

    .btn-main, .contact-form button {
        padding: 10px;
        font-size: 0.9rem;
    }

    .contact-form input[type="text"],
    .contact-form input[type="email"],
    .contact-form textarea {
        font-size: 0.9rem;
        padding: 8px;
    }

    .contact-form label {
        font-size: 0.85rem;
        margin-top: 10px;
    }

    .footer {
        font-size: 0.75rem;
        padding: 10px;
    }

    .feature-step {
        margin-bottom: 18px;
        padding: 0 10px;
    }

    .feature-step h2 {
        font-size: 1.2rem;
    }

    .feature-step p {
        font-size: 0.85rem;
    }

    .feature-image {
        margin: 10px 0;
    }

    .breadcrumbs {
        padding: 6px 10px;
        font-size: 0.75rem;
        margin: 10px 0;
    }

    .breadcrumbs li:not(:last-child)::after {
        margin: 0 5px;
    }

    .alert {
        padding: 10px 12px;
        font-size: 0.85rem;
        margin: 12px 0;
    }

    .error-message {
        font-size: 0.75rem;
    }

    .main-container h1,
    .main-container h2,
    .main-container h3,
    .main-container h4,
    .main-container h5,
    .main-container h6 {
        font-size: 1.3rem;
        margin: 0.7em 0;
    }

    .main-container h2 {
        font-size: 1.2rem;
    }

    .skip-link {
        font-size: 0.85rem;
        padding: 5px;
    }
}

/* Индикатор загрузки */
.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.button-loader {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Темная тема */
.dark-mode {
    --primary-color: #4db8d9;
    --secondary-color: #ffa64d;
    --background-color: #1a1a1a;
    --text-color: #e0e0e0;
    --text-light: #fff;
}

.dark-mode body {
    background-color: var(--background-color);
    color: var(--text-color);
}

.dark-mode .navbar {
    background-color: #2d2d2d;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.dark-mode .feature-card,
.dark-mode .content-section,
.dark-mode .overview-container,
.dark-mode .features-container,
.dark-mode .privacy-container,
.dark-mode .contact-container {
    background-color: #2d2d2d;
    color: var(--text-color);
}

.dark-mode .alert-success {
    background-color: #1e4d2e;
    color: #90ee90;
    border-color: #2d5a3d;
}

.dark-mode .alert-danger {
    background-color: #4d1e1e;
    color: #ff6b6b;
    border-color: #5a2d2d;
}

.dark-mode .contact-form input,
.dark-mode .contact-form textarea {
    background-color: #333;
    color: var(--text-color);
    border-color: #555;
}

.dark-mode .contact-form input:focus,
.dark-mode .contact-form textarea:focus {
    border-color: var(--primary-color);
    background-color: #3a3a3a;
}

.dark-mode .footer {
    background-color: #1a1a1a;
    color: var(--text-color);
}

.dark-mode .hero {
    background: linear-gradient(135deg, #2d2d2d, #1a1a1a);
}

/* Переключатель темы */
.theme-toggle {
    background: transparent;
    border: 2px solid var(--text-light);
    color: var(--text-light);
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    margin-left: 10px;
}

.theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: scale(1.1);
}

.dark-mode .theme-toggle {
    border-color: var(--text-color);
    color: var(--text-color);
}

/* Доступность */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: var(--text-light);
    padding: 8px;
    text-decoration: none;
    z-index: 10000;
    border-radius: 0 0 4px 0;
}

.skip-link:focus {
    top: 0;
}

.keyboard-focus {
    outline: 3px solid var(--primary-color) !important;
    outline-offset: 2px;
}

/* Улучшенные focus indicators */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Breadcrumbs */
.breadcrumbs {
    padding: 15px 20px;
    background-color: rgba(3, 142, 175, 0.1);
    border-radius: 5px;
    margin: 20px 0;
    font-size: 0.9rem;
}

.breadcrumbs ol {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}

.breadcrumbs li {
    display: inline-flex;
    align-items: center;
}

.breadcrumbs li:not(:last-child)::after {
    content: '/';
    margin: 0 10px;
    color: var(--primary-color);
}

.breadcrumbs a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumbs a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

.breadcrumbs [aria-current="page"] {
    color: var(--text-color);
    font-weight: 500;
}

.dark-mode .breadcrumbs {
    background-color: rgba(77, 184, 217, 0.1);
}

/* Улучшения для формы */
#form-messages {
    margin-bottom: 20px;
}

#form-messages .alert {
    animation: slideIn 0.3s ease-out;
}

/* Горизонтальная ориентация мобильных (landscape) */
@media (max-width: 767px) and (orientation: landscape) {
    .hero {
        padding: 40px 15px;
    }

    .hero h1 {
        font-size: 1.6rem;
    }

    .navbar {
        padding: 5px 0;
    }

    .logo {
        width: 60px;
        height: 60px;
    }
}

/* Доступность: отключение анимаций при системной настройке reduced motion */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    body {
        transition: none;
    }

    .animate-section,
    .hero-content,
    .feature-step {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .hero h1,
    .hero p {
        animation: none;
    }

    .logo {
        transition: none;
    }

    .logo:hover {
        animation: none;
    }

    .menu li a,
    .menu li a::after {
        transition: none;
    }

    .btn-main,
    .contact-form button,
    .feature-card,
    .feature-card i,
    .feature-image img,
    .breadcrumbs a,
    .theme-toggle,
    .contact-form input[type="text"],
    .contact-form input[type="email"],
    .contact-form textarea {
        transition: none;
    }

    .feature-card:hover,
    .feature-card:hover i,
    .btn-main:hover,
    .contact-form button:hover,
    .feature-image img:hover {
        transform: none;
    }

    .alert,
    #form-messages .alert {
        animation: none;
    }

    .spinner {
        animation: none;
    }
}