/* --- ОБЩИЕ СТИЛИ --- */
:root {
    --primary-color: #0078D4;
    --secondary-color: #2c3e50;
    --background-color: #f4f7f6;
    --text-color: #333;
    --light-gray: #ecf0f1;
    --white: #ffffff;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Montserrat', sans-serif;
    line-height: 1.7;
    background-color: var(--background-color);
    color: var(--text-color);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3 {
    color: var(--secondary-color);
    margin-bottom: 20px;
}

h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 40px;
}

section {
    padding: 60px 0;
}

/* --- ШАПКА --- */
header {
    background: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo-icon {
    width: 48px;
    height: 48px;
}

.nav-container {
    display: flex;
    align-items: center;
    gap: 20px;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    transition: color 0.3s ease;
}

.main-nav a:hover {
    color: var(--primary-color);
}

/* --- ГЛАВНЫЙ ЭКРАН (HERO) --- */
#hero {
    background: linear-gradient(rgba(44, 62, 80, 0.7), rgba(44, 62, 80, 0.7)), url(https://images.unsplash.com/photo-1517245386807-bb43f82c33c4?auto=format&fit=crop&w=1200&q=80) center/cover no-repeat;
    color: var(--white);
    text-align: center;
    padding: 100px 0;
}

#hero h1 {
    font-size: 3rem;
    color: var(--white);
}

#hero p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 30px auto;
}

.cta-button {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 15px 30px;
    text-decoration: none;
    font-weight: 700;
    border-radius: 5px;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.cta-button:hover {
    background: #005a9e;
    transform: scale(1.05);
}

/* --- ВОЗМОЖНОСТИ (FEATURES) --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--white);
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}

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

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 25px rgba(0,0,0,0.1);
}

.feature-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

/* --- ГАЛЕРЕЯ --- */
#gallery {
    background-color: var(--light-gray);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    opacity: 0;
    transform: scale(0.95);
}

.gallery-item.visible img {
    opacity: 1;
    transform: scale(1);
}

.gallery-item img:hover {
    transform: scale(1.03);
}

/* --- СКАЧАТЬ --- */
#download {
    text-align: center;
}

#download p {
    margin-bottom: 30px;
}

.system-req {
    margin-top: 15px;
    font-size: 0.9rem;
    color: #777;
}

/* --- ПОДВАЛ --- */
footer {
    background: var(--secondary-color);
    color: #ccc;
    text-align: center;
    padding: 30px 0;
}

footer a {
    color: var(--white);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* --- Стили для переключателя языков --- */
.lang-switcher {
    position: relative;
}

.lang-button {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--light-gray);
    border: none;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    font-size: 1rem;
}

.lang-button i.fa-chevron-down {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.lang-switcher.open .lang-button i.fa-chevron-down {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: 110%;
    right: 0;
    background: var(--white);
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    width: 150px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    opacity: 0;
    transform: translateY(10px);
    visibility: hidden;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}

.lang-switcher.open .lang-dropdown {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
}

.lang-link {
    text-decoration: none;
    color: var(--text-color);
    padding: 10px 15px;
    transition: background-color 0.3s ease;
}

.lang-link:hover {
    background-color: var(--light-gray);
}

.lang-link.active {
    background-color: var(--primary-color);
    color: var(--white);
    font-weight: 700;
}

/* --- Стили для бургер-меню (скрыто на десктопе) --- */
.burger-menu {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--secondary-color);
    cursor: pointer;
    z-index: 1001;
}

/* --- АДАПТИВНОСТЬ --- */
@media (max-width: 992px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
    h2 {
        font-size: 1.8rem;
    }

    /* Скрываем десктопную навигацию и показываем бургер */
    .nav-container {
        display: none;
    }
    .burger-menu {
        display: block;
    }
}

@media (max-width: 600px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* --- Стили для мобильного меню (появляется при необходимости) --- */
.mobile-nav-container {
    position: fixed;
    top: 0;
    right: -100%; /* Скрыто за экраном */
    width: 250px;
    height: 100%;
    background: var(--white);
    box-shadow: -5px 0 15px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 40px;
    transition: right 0.4s ease-in-out;
    padding: 60px 20px;
    z-index: 1000;
}

.mobile-nav-container.open {
    right: 0; /* Показываем меню */
}

.mobile-nav-container .main-nav ul {
    flex-direction: column;
    text-align: center;
}

.mobile-nav-container .main-nav a {
    font-size: 1.2rem;
}

.mobile-nav-container .lang-switcher {
    display: flex;
    flex-direction: column;
    width: 100%;
}

.mobile-nav-container .lang-button {
    width: 100%;
    justify-content: center;
}

.mobile-nav-container .lang-dropdown {
    position: static;
    width: 100%;
    box-shadow: none;
    border-radius: 0;
    max-height: 0;
    transition: max-height 0.4s ease-in-out;
}

.mobile-nav-container .lang-switcher.open .lang-dropdown {
    max-height: 500px;
}

.burger-menu.open i::before {
    content: '\f00d'; /* Крестик */
}