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

/* Body */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #0a0a0a;
    color: #fff;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Background Gradient */
.image-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    object-fit: cover;
    z-index: -3;
    opacity: 0.4;
    filter: blur(3px);
}

/* Layer Blur */
.layer-blur {
    position: fixed;
    inset: 0;
    backdrop-filter: blur(80px);
    z-index: -2;
}

/* Container */
.container {
    max-width: 1200px;
    margin: auto;
    padding: 20px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    flex-wrap: wrap;
    gap: 1rem;
    position: relative;
    z-index: 10;
    background: transparent;
}

/* Logo */
.logo {
    font-size: 2rem;
    font-weight: bold;
    color: #00ffd5;
    letter-spacing: 1px;
}

/* Nav */
nav {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    align-items: center;
}

nav a {
    text-decoration: none;
    color: #ffffffcc;
    font-weight: 500;
    transition: color 0.3s ease;
    text-transform: uppercase;
}

nav a:hover {
    color: #00ffd5;
    text-shadow: 0 0 5px rgba(0, 255, 213, 0.5);
}

/* Sign in button */
.btn-signing {
    padding: 12px 20px;
    background-color: transparent;
    border: 2px solid #00ffd5;
    color: #00ffd5;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    white-space: nowrap;
    z-index: 12;
}

.btn-signing:hover {
    background-color: #00ffd5;
    color: #000;
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 22px;
    cursor: pointer;
    z-index: 15;
}

.hamburger span {
    height: 3px;
    width: 100%;
    background-color: #00ffd5;
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Main Content */
main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding-top: 60px;
    min-height: 80vh;
    position: relative;
}

/* Content Section */
.content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.tag-box .tag {
    background: #00ffd510;
    color: #00ffd5;
    display: inline-block;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}

.content h1 {
    font-size: 3rem;
    line-height: 1.2;
    color: #fff;
    font-weight: 800;
    text-shadow: 0 0 10px rgba(0, 255, 213, 0.5);
}

.description {
    font-size: 1.1rem;
    color: #ccc;
}

/* Buttons */
.buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.btn-get-started,
.btn-signing-main {
    padding: 12px 20px;
    font-weight: bold;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-get-started {
    background: #00ffd5;
    color: #000;
}

.btn-get-started:hover {
    background: #00c4a5;
}

.btn-signing-main {
    border: 2px solid #00ffd5;
    color: #00ffd5;
    background: transparent;
}

.btn-signing-main:hover {
    background: #00ffd5;
    color: #000;
}

/* 3D Viewer */
.robot-3d {
    width: 100%;
    height: 500px;
    position: relative;
    transition: all 0.5s ease;
}

.robot-3d iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Responsive Styles */
@media (max-width: 900px) {
    main {
        grid-template-columns: 1fr;
        text-align: center;
    }

    header {
        flex-wrap: nowrap;
    }

    nav {
        position: fixed;
        top: 60px;
        right: -250px; /* Hide offscreen */
        width: 200px;
        height: calc(100vh - 60px);
        background-color: rgba(0, 0, 0, 0.9);
        flex-direction: column;
        gap: 20px;
        padding: 20px;
        box-shadow: -2px 0 10px rgba(0,0,0,0.5);
        transition: right 0.3s ease;
        z-index: 14;
        overflow-y: auto;
    }

    nav.open {
        right: 0; /* Slide in */
    }

    nav a {
        font-size: 1.1rem;
        color: #00ffd5;
        text-align: left;
    }

    .btn-signing {
        position: relative;
        z-index: 12;
    }

    .hamburger {
        display: flex;
    }
}

/* Hamburger active animation */
.hamburger.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* Footer */
footer {
    background-color: rgba(0, 0, 0, 0.3);
    color: white;
    text-align: center;
    padding: 10px 0;
    font-size: 0.9rem;
    position: fixed;
    width: 100%;
    bottom: 0;
}

footer a {
    color: #ffd700;
    text-decoration: none;
}

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