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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #12141a;
    color: #e1e4e8;
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

/* Шапка */
header {
    background-color: #1b1f2b;
    border-bottom: 2px solid #2d3348;
    padding: 1rem 0;
}

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

.logo {
    color: #4da3ff;
    font-size: 1.5rem;
    font-weight: bold;
}

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

nav a {
    color: #a0aec0;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

nav a:hover, nav a.active {
    color: #4da3ff;
}

/* Главная секция (Hero) */
.hero {
    background: linear-gradient(rgba(18, 20, 26, 0.8), rgba(18, 20, 26, 0.8)), url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect width="100" height="100" fill="%231b1f2b"/></svg>');
    padding: 5rem 0;
    text-align: center;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #fff;
}

.hero p {
    font-size: 1.1rem;
    color: #a0aec0;
    max-width: 600px;
    margin: 0 auto 2rem auto;
}

/* Кнопки */
.btn {
    display: inline-block;
    background-color: #3182ce;
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #2b6cb0;
}

/* Особенности */
.features {
    padding: 4rem 0;
    background-color: #181b24;
}

.features h3 {
    text-align: center;
    margin-bottom: 2.5rem;
    font-size: 2rem;
    color: #fff;
}

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

.card {
    background-color: #1b1f2b;
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid #2d3348;
}

.card h4 {
    margin-bottom: 1rem;
    color: #4da3ff;
}

/* Текстовые страницы */
.content-page {
    padding: 4rem 0;
}

.content-page h2 {
    margin-bottom: 1.5rem;
    color: #fff;
}

.content-page h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: #4da3ff;
}

.content-page p {
    margin-bottom: 1rem;
    color: #c5cdd6;
}

/* Блок скачивания */
.download-box {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 2rem;
}

.platform {
    background-color: #1b1f2b;
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid #2d3348;
    text-align: center;
}

.platform h3 {
    margin-top: 0;
}

.platform p {
    margin: 1rem 0;
}

/* Подвал */
footer {
    background-color: #1b1f2b;
    text-align: center;
    padding: 1.5rem 0;
    border-top: 1px solid #2d3348;
    color: #718096;
    margin-top: auto;
}