:root {
    --bg: #0d1117;
    --card: #161b22;
    --accent: #58a6ff;
    --border: #30363d;
    --text: #c9d1d9;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    margin: 0;
}

#page-selection.active {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 70vh;
}

.page {
    display: none;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 60px 20px;
}

.page.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

.portal-header {
    text-align: center;
    margin-bottom: 50px;
}

.portal-header h1 {
    font-size: 3rem;
    letter-spacing: -1px;
}

.highlight {
    color: var(--accent);
    text-shadow: 0 0 20px rgba(88, 166, 255, 0.4);
}


.device-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.device-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.device-card:hover {
    border-color: var(--accent);
    background: rgba(88, 166, 255, 0.05);
    transform: translateY(-8px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.device-card .icon {
    font-size: 50px;
    margin-bottom: 20px;
}

.device-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #fff;
}

.device-card p {
    font-size: 14px;
    color: #8b949e;
    line-height: 1.4;
}


.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 10px 18px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    text-decoration: none !important;
    outline: none;
    margin-bottom: 0px;
}

.btn-back:hover {
    background: rgba(88, 166, 255, 0.1);
    border-color: var(--accent);
    color: var(--accent);
}

.btn-back .icon {
    font-size: 16px;
    transition: transform 0.3s ease;
}

.btn-back:hover .icon {
    transform: translateX(-5px);
}

.nav-header {
    margin-bottom: 30px;
    display: flex;
    align-items: center;
}


.page-title-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
    margin-top: 10px;
}

.page-title-header h2 {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: 2px;
    color: #fff;
    white-space: nowrap;
    text-shadow: 0 0 15px rgba(88, 166, 255, 0.3);
}

.page-title-header .line {
    flex-grow: 1;
    height: 1px;
    background: linear-gradient(to right,
            transparent,
            var(--border),
            transparent);
}