:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --text-color: #e0e0e0;
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --border-color: #343a40;
    --header-bg: rgba(18, 18, 18, 0.8);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

header {
    background-color: var(--header-bg);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

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

.header-right {
    display: flex;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #ffffff;
    text-decoration: none;
}

.desktop-nav ul {
    list-style: none;
    display: flex;
}

.desktop-nav ul li {
    margin-left: 20px;
}

.desktop-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.hamburger-menu {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
}

.hamburger-menu span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 5px 0;
    transition: all 0.3s ease;
}

.mobile-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--header-bg);
    border-top: 1px solid var(--border-color);
}

.mobile-nav ul {
    list-style: none;
}

.mobile-nav ul li {
    text-align: center;
}

.mobile-nav a {
    display: block;
    padding: 15px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: background-color 0.3s;
}

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

.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
}

#bg-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: -2;
    transform: translateX(-50%) translateY(-50%);
    background-size: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: -1;
}

.hero-content {
    z-index: 1;
    padding: 0 20px;
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #fff;
}

.hero p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: #fff;
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: #fff;
    padding: 12px 24px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #0056b3;
}

section {
    padding: 40px 0;
}

section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.about p,
.contact p {
    max-width: 800px;
    margin: 0 auto 1.5rem auto;
    font-size: 1rem;
    color: var(--text-color);
}

.contact {
    text-align: center;
}

.robots .container,
.services .container ul {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    list-style: none;
    padding: 0;
}

.robot-card,
.services li {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    width: 100%;
    max-width: 350px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.robot-card:hover,
.services li:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.3);
}

.robot-card h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

footer {
    background-color: var(--card-bg);
    color: var(--text-color);
    text-align: center;
    padding: 20px 0;
    margin-top: 30px;
    border-top: 1px solid var(--border-color);
}

footer p {
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .desktop-nav { display: none; }
    .hamburger-menu { display: block; }
    .mobile-nav.is-open { display: block; }
    .hero h2 { font-size: 2.5rem; }
    .hero p { font-size: 1rem; }
}

@media (min-width: 769px) {
    .robots .container,
    .services .container ul {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
        align-items: stretch;
    }
}